1 /*
2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_types.h"
21 #include "xfs_bit.h"
22 #include "xfs_log.h"
23 #include "xfs_inum.h"
24 #include "xfs_trans.h"
25 #include "xfs_sb.h"
26 #include "xfs_ag.h"
27 #include "xfs_dir2.h"
28 #include "xfs_da_btree.h"
29 #include "xfs_bmap_btree.h"
30 #include "xfs_alloc_btree.h"
31 #include "xfs_ialloc_btree.h"
32 #include "xfs_dinode.h"
33 #include "xfs_inode.h"
34 #include "xfs_btree.h"
35 #include "xfs_mount.h"
36 #include "xfs_itable.h"
37 #include "xfs_inode_item.h"
38 #include "xfs_extfree_item.h"
39 #include "xfs_alloc.h"
40 #include "xfs_bmap.h"
41 #include "xfs_rtalloc.h"
42 #include "xfs_error.h"
43 #include "xfs_attr_leaf.h"
44 #include "xfs_rw.h"
45 #include "xfs_quota.h"
46 #include "xfs_trans_space.h"
47 #include "xfs_buf_item.h"
48 #include "xfs_filestream.h"
49 #include "xfs_vnodeops.h"
50 #include "xfs_trace.h"
51
52
53 kmem_zone_t *xfs_bmap_free_item_zone;
54
55 /*
56 * Prototypes for internal bmap routines.
57 */
58
59 #ifdef DEBUG
60 STATIC void
61 xfs_bmap_check_leaf_extents(
62 struct xfs_btree_cur *cur,
63 struct xfs_inode *ip,
64 int whichfork);
65 #else
66 #define xfs_bmap_check_leaf_extents(cur, ip, whichfork) do { } while (0)
67 #endif
68
69
70 /*
71 * Called from xfs_bmap_add_attrfork to handle extents format files.
72 */
73 STATIC int /* error */
74 xfs_bmap_add_attrfork_extents(
75 xfs_trans_t *tp, /* transaction pointer */
76 xfs_inode_t *ip, /* incore inode pointer */
77 xfs_fsblock_t *firstblock, /* first block allocated */
78 xfs_bmap_free_t *flist, /* blocks to free at commit */
79 int *flags); /* inode logging flags */
80
81 /*
82 * Called from xfs_bmap_add_attrfork to handle local format files.
83 */
84 STATIC int /* error */
85 xfs_bmap_add_attrfork_local(
86 xfs_trans_t *tp, /* transaction pointer */
87 xfs_inode_t *ip, /* incore inode pointer */
88 xfs_fsblock_t *firstblock, /* first block allocated */
89 xfs_bmap_free_t *flist, /* blocks to free at commit */
90 int *flags); /* inode logging flags */
91
92 /*
93 * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
94 * It figures out where to ask the underlying allocator to put the new extent.
95 */
96 STATIC int /* error */
97 xfs_bmap_alloc(
98 xfs_bmalloca_t *ap); /* bmap alloc argument struct */
99
100 /*
101 * Transform a btree format file with only one leaf node, where the
102 * extents list will fit in the inode, into an extents format file.
103 * Since the file extents are already in-core, all we have to do is
104 * give up the space for the btree root and pitch the leaf block.
105 */
106 STATIC int /* error */
107 xfs_bmap_btree_to_extents(
108 xfs_trans_t *tp, /* transaction pointer */
109 xfs_inode_t *ip, /* incore inode pointer */
110 xfs_btree_cur_t *cur, /* btree cursor */
111 int *logflagsp, /* inode logging flags */
112 int whichfork); /* data or attr fork */
113
114 /*
115 * Remove the entry "free" from the free item list. Prev points to the
116 * previous entry, unless "free" is the head of the list.
117 */
118 STATIC void
119 xfs_bmap_del_free(
120 xfs_bmap_free_t *flist, /* free item list header */
121 xfs_bmap_free_item_t *prev, /* previous item on list, if any */
122 xfs_bmap_free_item_t *free); /* list item to be freed */
123
124 /*
125 * Convert an extents-format file into a btree-format file.
126 * The new file will have a root block (in the inode) and a single child block.
127 */
128 STATIC int /* error */
129 xfs_bmap_extents_to_btree(
130 xfs_trans_t *tp, /* transaction pointer */
131 xfs_inode_t *ip, /* incore inode pointer */
132 xfs_fsblock_t *firstblock, /* first-block-allocated */
133 xfs_bmap_free_t *flist, /* blocks freed in xaction */
134 xfs_btree_cur_t **curp, /* cursor returned to caller */
135 int wasdel, /* converting a delayed alloc */
136 int *logflagsp, /* inode logging flags */
137 int whichfork); /* data or attr fork */
138
139 /*
140 * Convert a local file to an extents file.
141 * This code is sort of bogus, since the file data needs to get
142 * logged so it won't be lost. The bmap-level manipulations are ok, though.
143 */
144 STATIC int /* error */
145 xfs_bmap_local_to_extents(
146 xfs_trans_t *tp, /* transaction pointer */
147 xfs_inode_t *ip, /* incore inode pointer */
148 xfs_fsblock_t *firstblock, /* first block allocated in xaction */
149 xfs_extlen_t total, /* total blocks needed by transaction */
150 int *logflagsp, /* inode logging flags */
151 int whichfork); /* data or attr fork */
152
153 /*
154 * Search the extents list for the inode, for the extent containing bno.
155 * If bno lies in a hole, point to the next entry. If bno lies past eof,
156 * *eofp will be set, and *prevp will contain the last entry (null if none).
157 * Else, *lastxp will be set to the index of the found
158 * entry; *gotp will contain the entry.
159 */
160 STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
161 xfs_bmap_search_extents(
162 xfs_inode_t *ip, /* incore inode pointer */
163 xfs_fileoff_t bno, /* block number searched for */
164 int whichfork, /* data or attr fork */
165 int *eofp, /* out: end of file found */
166 xfs_extnum_t *lastxp, /* out: last extent index */
167 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
168 xfs_bmbt_irec_t *prevp); /* out: previous extent entry found */
169
170 /*
171 * Compute the worst-case number of indirect blocks that will be used
172 * for ip's delayed extent of length "len".
173 */
174 STATIC xfs_filblks_t
175 xfs_bmap_worst_indlen(
176 xfs_inode_t *ip, /* incore inode pointer */
177 xfs_filblks_t len); /* delayed extent length */
178
179 #ifdef DEBUG
180 /*
181 * Perform various validation checks on the values being returned
182 * from xfs_bmapi().
183 */
184 STATIC void
185 xfs_bmap_validate_ret(
186 xfs_fileoff_t bno,
187 xfs_filblks_t len,
188 int flags,
189 xfs_bmbt_irec_t *mval,
190 int nmap,
191 int ret_nmap);
192 #else
193 #define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap)
194 #endif /* DEBUG */
195
196 STATIC int
197 xfs_bmap_count_tree(
198 xfs_mount_t *mp,
199 xfs_trans_t *tp,
200 xfs_ifork_t *ifp,
201 xfs_fsblock_t blockno,
202 int levelin,
203 int *count);
204
205 STATIC void
206 xfs_bmap_count_leaves(
207 xfs_ifork_t *ifp,
208 xfs_extnum_t idx,
209 int numrecs,
210 int *count);
211
212 STATIC void
213 xfs_bmap_disk_count_leaves(
214 struct xfs_mount *mp,
215 struct xfs_btree_block *block,
216 int numrecs,
217 int *count);
218
219 /*
220 * Bmap internal routines.
221 */
222
223 STATIC int /* error */
xfs_bmbt_lookup_eq(struct xfs_btree_cur * cur,xfs_fileoff_t off,xfs_fsblock_t bno,xfs_filblks_t len,int * stat)224 xfs_bmbt_lookup_eq(
225 struct xfs_btree_cur *cur,
226 xfs_fileoff_t off,
227 xfs_fsblock_t bno,
228 xfs_filblks_t len,
229 int *stat) /* success/failure */
230 {
231 cur->bc_rec.b.br_startoff = off;
232 cur->bc_rec.b.br_startblock = bno;
233 cur->bc_rec.b.br_blockcount = len;
234 return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat);
235 }
236
237 STATIC int /* error */
xfs_bmbt_lookup_ge(struct xfs_btree_cur * cur,xfs_fileoff_t off,xfs_fsblock_t bno,xfs_filblks_t len,int * stat)238 xfs_bmbt_lookup_ge(
239 struct xfs_btree_cur *cur,
240 xfs_fileoff_t off,
241 xfs_fsblock_t bno,
242 xfs_filblks_t len,
243 int *stat) /* success/failure */
244 {
245 cur->bc_rec.b.br_startoff = off;
246 cur->bc_rec.b.br_startblock = bno;
247 cur->bc_rec.b.br_blockcount = len;
248 return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat);
249 }
250
251 /*
252 * Check if the inode needs to be converted to btree format.
253 */
xfs_bmap_needs_btree(struct xfs_inode * ip,int whichfork)254 static inline bool xfs_bmap_needs_btree(struct xfs_inode *ip, int whichfork)
255 {
256 return XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
257 XFS_IFORK_NEXTENTS(ip, whichfork) >
258 XFS_IFORK_MAXEXT(ip, whichfork);
259 }
260
261 /*
262 * Check if the inode should be converted to extent format.
263 */
xfs_bmap_wants_extents(struct xfs_inode * ip,int whichfork)264 static inline bool xfs_bmap_wants_extents(struct xfs_inode *ip, int whichfork)
265 {
266 return XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
267 XFS_IFORK_NEXTENTS(ip, whichfork) <=
268 XFS_IFORK_MAXEXT(ip, whichfork);
269 }
270
271 /*
272 * Update the record referred to by cur to the value given
273 * by [off, bno, len, state].
274 * This either works (return 0) or gets an EFSCORRUPTED error.
275 */
276 STATIC int
xfs_bmbt_update(struct xfs_btree_cur * cur,xfs_fileoff_t off,xfs_fsblock_t bno,xfs_filblks_t len,xfs_exntst_t state)277 xfs_bmbt_update(
278 struct xfs_btree_cur *cur,
279 xfs_fileoff_t off,
280 xfs_fsblock_t bno,
281 xfs_filblks_t len,
282 xfs_exntst_t state)
283 {
284 union xfs_btree_rec rec;
285
286 xfs_bmbt_disk_set_allf(&rec.bmbt, off, bno, len, state);
287 return xfs_btree_update(cur, &rec);
288 }
289
290 /*
291 * Called from xfs_bmap_add_attrfork to handle btree format files.
292 */
293 STATIC int /* error */
xfs_bmap_add_attrfork_btree(xfs_trans_t * tp,xfs_inode_t * ip,xfs_fsblock_t * firstblock,xfs_bmap_free_t * flist,int * flags)294 xfs_bmap_add_attrfork_btree(
295 xfs_trans_t *tp, /* transaction pointer */
296 xfs_inode_t *ip, /* incore inode pointer */
297 xfs_fsblock_t *firstblock, /* first block allocated */
298 xfs_bmap_free_t *flist, /* blocks to free at commit */
299 int *flags) /* inode logging flags */
300 {
301 xfs_btree_cur_t *cur; /* btree cursor */
302 int error; /* error return value */
303 xfs_mount_t *mp; /* file system mount struct */
304 int stat; /* newroot status */
305
306 mp = ip->i_mount;
307 if (ip->i_df.if_broot_bytes <= XFS_IFORK_DSIZE(ip))
308 *flags |= XFS_ILOG_DBROOT;
309 else {
310 cur = xfs_bmbt_init_cursor(mp, tp, ip, XFS_DATA_FORK);
311 cur->bc_private.b.flist = flist;
312 cur->bc_private.b.firstblock = *firstblock;
313 if ((error = xfs_bmbt_lookup_ge(cur, 0, 0, 0, &stat)))
314 goto error0;
315 /* must be at least one entry */
316 XFS_WANT_CORRUPTED_GOTO(stat == 1, error0);
317 if ((error = xfs_btree_new_iroot(cur, flags, &stat)))
318 goto error0;
319 if (stat == 0) {
320 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
321 return XFS_ERROR(ENOSPC);
322 }
323 *firstblock = cur->bc_private.b.firstblock;
324 cur->bc_private.b.allocated = 0;
325 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
326 }
327 return 0;
328 error0:
329 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
330 return error;
331 }
332
333 /*
334 * Called from xfs_bmap_add_attrfork to handle extents format files.
335 */
336 STATIC int /* error */
xfs_bmap_add_attrfork_extents(xfs_trans_t * tp,xfs_inode_t * ip,xfs_fsblock_t * firstblock,xfs_bmap_free_t * flist,int * flags)337 xfs_bmap_add_attrfork_extents(
338 xfs_trans_t *tp, /* transaction pointer */
339 xfs_inode_t *ip, /* incore inode pointer */
340 xfs_fsblock_t *firstblock, /* first block allocated */
341 xfs_bmap_free_t *flist, /* blocks to free at commit */
342 int *flags) /* inode logging flags */
343 {
344 xfs_btree_cur_t *cur; /* bmap btree cursor */
345 int error; /* error return value */
346
347 if (ip->i_d.di_nextents * sizeof(xfs_bmbt_rec_t) <= XFS_IFORK_DSIZE(ip))
348 return 0;
349 cur = NULL;
350 error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist, &cur, 0,
351 flags, XFS_DATA_FORK);
352 if (cur) {
353 cur->bc_private.b.allocated = 0;
354 xfs_btree_del_cursor(cur,
355 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
356 }
357 return error;
358 }
359
360 /*
361 * Called from xfs_bmap_add_attrfork to handle local format files.
362 */
363 STATIC int /* error */
xfs_bmap_add_attrfork_local(xfs_trans_t * tp,xfs_inode_t * ip,xfs_fsblock_t * firstblock,xfs_bmap_free_t * flist,int * flags)364 xfs_bmap_add_attrfork_local(
365 xfs_trans_t *tp, /* transaction pointer */
366 xfs_inode_t *ip, /* incore inode pointer */
367 xfs_fsblock_t *firstblock, /* first block allocated */
368 xfs_bmap_free_t *flist, /* blocks to free at commit */
369 int *flags) /* inode logging flags */
370 {
371 xfs_da_args_t dargs; /* args for dir/attr code */
372 int error; /* error return value */
373 xfs_mount_t *mp; /* mount structure pointer */
374
375 if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip))
376 return 0;
377 if (S_ISDIR(ip->i_d.di_mode)) {
378 mp = ip->i_mount;
379 memset(&dargs, 0, sizeof(dargs));
380 dargs.dp = ip;
381 dargs.firstblock = firstblock;
382 dargs.flist = flist;
383 dargs.total = mp->m_dirblkfsbs;
384 dargs.whichfork = XFS_DATA_FORK;
385 dargs.trans = tp;
386 error = xfs_dir2_sf_to_block(&dargs);
387 } else
388 error = xfs_bmap_local_to_extents(tp, ip, firstblock, 1, flags,
389 XFS_DATA_FORK);
390 return error;
391 }
392
393 /*
394 * Convert a delayed allocation to a real allocation.
395 */
396 STATIC int /* error */
xfs_bmap_add_extent_delay_real(struct xfs_bmalloca * bma)397 xfs_bmap_add_extent_delay_real(
398 struct xfs_bmalloca *bma)
399 {
400 struct xfs_bmbt_irec *new = &bma->got;
401 int diff; /* temp value */
402 xfs_bmbt_rec_host_t *ep; /* extent entry for idx */
403 int error; /* error return value */
404 int i; /* temp state */
405 xfs_ifork_t *ifp; /* inode fork pointer */
406 xfs_fileoff_t new_endoff; /* end offset of new entry */
407 xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
408 /* left is 0, right is 1, prev is 2 */
409 int rval=0; /* return value (logging flags) */
410 int state = 0;/* state bits, accessed thru macros */
411 xfs_filblks_t da_new; /* new count del alloc blocks used */
412 xfs_filblks_t da_old; /* old count del alloc blocks used */
413 xfs_filblks_t temp=0; /* value for da_new calculations */
414 xfs_filblks_t temp2=0;/* value for da_new calculations */
415 int tmp_rval; /* partial logging flags */
416
417 ifp = XFS_IFORK_PTR(bma->ip, XFS_DATA_FORK);
418
419 ASSERT(bma->idx >= 0);
420 ASSERT(bma->idx <= ifp->if_bytes / sizeof(struct xfs_bmbt_rec));
421 ASSERT(!isnullstartblock(new->br_startblock));
422 ASSERT(!bma->cur ||
423 (bma->cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL));
424
425 XFS_STATS_INC(xs_add_exlist);
426
427 #define LEFT r[0]
428 #define RIGHT r[1]
429 #define PREV r[2]
430
431 /*
432 * Set up a bunch of variables to make the tests simpler.
433 */
434 ep = xfs_iext_get_ext(ifp, bma->idx);
435 xfs_bmbt_get_all(ep, &PREV);
436 new_endoff = new->br_startoff + new->br_blockcount;
437 ASSERT(PREV.br_startoff <= new->br_startoff);
438 ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
439
440 da_old = startblockval(PREV.br_startblock);
441 da_new = 0;
442
443 /*
444 * Set flags determining what part of the previous delayed allocation
445 * extent is being replaced by a real allocation.
446 */
447 if (PREV.br_startoff == new->br_startoff)
448 state |= BMAP_LEFT_FILLING;
449 if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
450 state |= BMAP_RIGHT_FILLING;
451
452 /*
453 * Check and set flags if this segment has a left neighbor.
454 * Don't set contiguous if the combined extent would be too large.
455 */
456 if (bma->idx > 0) {
457 state |= BMAP_LEFT_VALID;
458 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1), &LEFT);
459
460 if (isnullstartblock(LEFT.br_startblock))
461 state |= BMAP_LEFT_DELAY;
462 }
463
464 if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
465 LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
466 LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
467 LEFT.br_state == new->br_state &&
468 LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
469 state |= BMAP_LEFT_CONTIG;
470
471 /*
472 * Check and set flags if this segment has a right neighbor.
473 * Don't set contiguous if the combined extent would be too large.
474 * Also check for all-three-contiguous being too large.
475 */
476 if (bma->idx < bma->ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1) {
477 state |= BMAP_RIGHT_VALID;
478 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx + 1), &RIGHT);
479
480 if (isnullstartblock(RIGHT.br_startblock))
481 state |= BMAP_RIGHT_DELAY;
482 }
483
484 if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
485 new_endoff == RIGHT.br_startoff &&
486 new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
487 new->br_state == RIGHT.br_state &&
488 new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
489 ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
490 BMAP_RIGHT_FILLING)) !=
491 (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
492 BMAP_RIGHT_FILLING) ||
493 LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
494 <= MAXEXTLEN))
495 state |= BMAP_RIGHT_CONTIG;
496
497 error = 0;
498 /*
499 * Switch out based on the FILLING and CONTIG state bits.
500 */
501 switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
502 BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
503 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
504 BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
505 /*
506 * Filling in all of a previously delayed allocation extent.
507 * The left and right neighbors are both contiguous with new.
508 */
509 bma->idx--;
510 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
511 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
512 LEFT.br_blockcount + PREV.br_blockcount +
513 RIGHT.br_blockcount);
514 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
515
516 xfs_iext_remove(bma->ip, bma->idx + 1, 2, state);
517 bma->ip->i_d.di_nextents--;
518 if (bma->cur == NULL)
519 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
520 else {
521 rval = XFS_ILOG_CORE;
522 error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
523 RIGHT.br_startblock,
524 RIGHT.br_blockcount, &i);
525 if (error)
526 goto done;
527 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
528 error = xfs_btree_delete(bma->cur, &i);
529 if (error)
530 goto done;
531 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
532 error = xfs_btree_decrement(bma->cur, 0, &i);
533 if (error)
534 goto done;
535 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
536 error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
537 LEFT.br_startblock,
538 LEFT.br_blockcount +
539 PREV.br_blockcount +
540 RIGHT.br_blockcount, LEFT.br_state);
541 if (error)
542 goto done;
543 }
544 break;
545
546 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
547 /*
548 * Filling in all of a previously delayed allocation extent.
549 * The left neighbor is contiguous, the right is not.
550 */
551 bma->idx--;
552
553 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
554 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
555 LEFT.br_blockcount + PREV.br_blockcount);
556 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
557
558 xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
559 if (bma->cur == NULL)
560 rval = XFS_ILOG_DEXT;
561 else {
562 rval = 0;
563 error = xfs_bmbt_lookup_eq(bma->cur, LEFT.br_startoff,
564 LEFT.br_startblock, LEFT.br_blockcount,
565 &i);
566 if (error)
567 goto done;
568 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
569 error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
570 LEFT.br_startblock,
571 LEFT.br_blockcount +
572 PREV.br_blockcount, LEFT.br_state);
573 if (error)
574 goto done;
575 }
576 break;
577
578 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
579 /*
580 * Filling in all of a previously delayed allocation extent.
581 * The right neighbor is contiguous, the left is not.
582 */
583 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
584 xfs_bmbt_set_startblock(ep, new->br_startblock);
585 xfs_bmbt_set_blockcount(ep,
586 PREV.br_blockcount + RIGHT.br_blockcount);
587 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
588
589 xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
590 if (bma->cur == NULL)
591 rval = XFS_ILOG_DEXT;
592 else {
593 rval = 0;
594 error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
595 RIGHT.br_startblock,
596 RIGHT.br_blockcount, &i);
597 if (error)
598 goto done;
599 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
600 error = xfs_bmbt_update(bma->cur, PREV.br_startoff,
601 new->br_startblock,
602 PREV.br_blockcount +
603 RIGHT.br_blockcount, PREV.br_state);
604 if (error)
605 goto done;
606 }
607 break;
608
609 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
610 /*
611 * Filling in all of a previously delayed allocation extent.
612 * Neither the left nor right neighbors are contiguous with
613 * the new one.
614 */
615 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
616 xfs_bmbt_set_startblock(ep, new->br_startblock);
617 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
618
619 bma->ip->i_d.di_nextents++;
620 if (bma->cur == NULL)
621 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
622 else {
623 rval = XFS_ILOG_CORE;
624 error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
625 new->br_startblock, new->br_blockcount,
626 &i);
627 if (error)
628 goto done;
629 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
630 bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
631 error = xfs_btree_insert(bma->cur, &i);
632 if (error)
633 goto done;
634 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
635 }
636 break;
637
638 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
639 /*
640 * Filling in the first part of a previous delayed allocation.
641 * The left neighbor is contiguous.
642 */
643 trace_xfs_bmap_pre_update(bma->ip, bma->idx - 1, state, _THIS_IP_);
644 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx - 1),
645 LEFT.br_blockcount + new->br_blockcount);
646 xfs_bmbt_set_startoff(ep,
647 PREV.br_startoff + new->br_blockcount);
648 trace_xfs_bmap_post_update(bma->ip, bma->idx - 1, state, _THIS_IP_);
649
650 temp = PREV.br_blockcount - new->br_blockcount;
651 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
652 xfs_bmbt_set_blockcount(ep, temp);
653 if (bma->cur == NULL)
654 rval = XFS_ILOG_DEXT;
655 else {
656 rval = 0;
657 error = xfs_bmbt_lookup_eq(bma->cur, LEFT.br_startoff,
658 LEFT.br_startblock, LEFT.br_blockcount,
659 &i);
660 if (error)
661 goto done;
662 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
663 error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
664 LEFT.br_startblock,
665 LEFT.br_blockcount +
666 new->br_blockcount,
667 LEFT.br_state);
668 if (error)
669 goto done;
670 }
671 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
672 startblockval(PREV.br_startblock));
673 xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
674 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
675
676 bma->idx--;
677 break;
678
679 case BMAP_LEFT_FILLING:
680 /*
681 * Filling in the first part of a previous delayed allocation.
682 * The left neighbor is not contiguous.
683 */
684 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
685 xfs_bmbt_set_startoff(ep, new_endoff);
686 temp = PREV.br_blockcount - new->br_blockcount;
687 xfs_bmbt_set_blockcount(ep, temp);
688 xfs_iext_insert(bma->ip, bma->idx, 1, new, state);
689 bma->ip->i_d.di_nextents++;
690 if (bma->cur == NULL)
691 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
692 else {
693 rval = XFS_ILOG_CORE;
694 error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
695 new->br_startblock, new->br_blockcount,
696 &i);
697 if (error)
698 goto done;
699 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
700 bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
701 error = xfs_btree_insert(bma->cur, &i);
702 if (error)
703 goto done;
704 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
705 }
706
707 if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
708 error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
709 bma->firstblock, bma->flist,
710 &bma->cur, 1, &tmp_rval, XFS_DATA_FORK);
711 rval |= tmp_rval;
712 if (error)
713 goto done;
714 }
715 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
716 startblockval(PREV.br_startblock) -
717 (bma->cur ? bma->cur->bc_private.b.allocated : 0));
718 ep = xfs_iext_get_ext(ifp, bma->idx + 1);
719 xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
720 trace_xfs_bmap_post_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
721 break;
722
723 case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
724 /*
725 * Filling in the last part of a previous delayed allocation.
726 * The right neighbor is contiguous with the new allocation.
727 */
728 temp = PREV.br_blockcount - new->br_blockcount;
729 trace_xfs_bmap_pre_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
730 xfs_bmbt_set_blockcount(ep, temp);
731 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, bma->idx + 1),
732 new->br_startoff, new->br_startblock,
733 new->br_blockcount + RIGHT.br_blockcount,
734 RIGHT.br_state);
735 trace_xfs_bmap_post_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
736 if (bma->cur == NULL)
737 rval = XFS_ILOG_DEXT;
738 else {
739 rval = 0;
740 error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
741 RIGHT.br_startblock,
742 RIGHT.br_blockcount, &i);
743 if (error)
744 goto done;
745 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
746 error = xfs_bmbt_update(bma->cur, new->br_startoff,
747 new->br_startblock,
748 new->br_blockcount +
749 RIGHT.br_blockcount,
750 RIGHT.br_state);
751 if (error)
752 goto done;
753 }
754
755 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
756 startblockval(PREV.br_startblock));
757 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
758 xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
759 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
760
761 bma->idx++;
762 break;
763
764 case BMAP_RIGHT_FILLING:
765 /*
766 * Filling in the last part of a previous delayed allocation.
767 * The right neighbor is not contiguous.
768 */
769 temp = PREV.br_blockcount - new->br_blockcount;
770 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
771 xfs_bmbt_set_blockcount(ep, temp);
772 xfs_iext_insert(bma->ip, bma->idx + 1, 1, new, state);
773 bma->ip->i_d.di_nextents++;
774 if (bma->cur == NULL)
775 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
776 else {
777 rval = XFS_ILOG_CORE;
778 error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
779 new->br_startblock, new->br_blockcount,
780 &i);
781 if (error)
782 goto done;
783 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
784 bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
785 error = xfs_btree_insert(bma->cur, &i);
786 if (error)
787 goto done;
788 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
789 }
790
791 if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
792 error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
793 bma->firstblock, bma->flist, &bma->cur, 1,
794 &tmp_rval, XFS_DATA_FORK);
795 rval |= tmp_rval;
796 if (error)
797 goto done;
798 }
799 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
800 startblockval(PREV.br_startblock) -
801 (bma->cur ? bma->cur->bc_private.b.allocated : 0));
802 ep = xfs_iext_get_ext(ifp, bma->idx);
803 xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
804 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
805
806 bma->idx++;
807 break;
808
809 case 0:
810 /*
811 * Filling in the middle part of a previous delayed allocation.
812 * Contiguity is impossible here.
813 * This case is avoided almost all the time.
814 *
815 * We start with a delayed allocation:
816 *
817 * +ddddddddddddddddddddddddddddddddddddddddddddddddddddddd+
818 * PREV @ idx
819 *
820 * and we are allocating:
821 * +rrrrrrrrrrrrrrrrr+
822 * new
823 *
824 * and we set it up for insertion as:
825 * +ddddddddddddddddddd+rrrrrrrrrrrrrrrrr+ddddddddddddddddd+
826 * new
827 * PREV @ idx LEFT RIGHT
828 * inserted at idx + 1
829 */
830 temp = new->br_startoff - PREV.br_startoff;
831 temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff;
832 trace_xfs_bmap_pre_update(bma->ip, bma->idx, 0, _THIS_IP_);
833 xfs_bmbt_set_blockcount(ep, temp); /* truncate PREV */
834 LEFT = *new;
835 RIGHT.br_state = PREV.br_state;
836 RIGHT.br_startblock = nullstartblock(
837 (int)xfs_bmap_worst_indlen(bma->ip, temp2));
838 RIGHT.br_startoff = new_endoff;
839 RIGHT.br_blockcount = temp2;
840 /* insert LEFT (r[0]) and RIGHT (r[1]) at the same time */
841 xfs_iext_insert(bma->ip, bma->idx + 1, 2, &LEFT, state);
842 bma->ip->i_d.di_nextents++;
843 if (bma->cur == NULL)
844 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
845 else {
846 rval = XFS_ILOG_CORE;
847 error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
848 new->br_startblock, new->br_blockcount,
849 &i);
850 if (error)
851 goto done;
852 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
853 bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
854 error = xfs_btree_insert(bma->cur, &i);
855 if (error)
856 goto done;
857 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
858 }
859
860 if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
861 error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
862 bma->firstblock, bma->flist, &bma->cur,
863 1, &tmp_rval, XFS_DATA_FORK);
864 rval |= tmp_rval;
865 if (error)
866 goto done;
867 }
868 temp = xfs_bmap_worst_indlen(bma->ip, temp);
869 temp2 = xfs_bmap_worst_indlen(bma->ip, temp2);
870 diff = (int)(temp + temp2 - startblockval(PREV.br_startblock) -
871 (bma->cur ? bma->cur->bc_private.b.allocated : 0));
872 if (diff > 0) {
873 error = xfs_icsb_modify_counters(bma->ip->i_mount,
874 XFS_SBS_FDBLOCKS,
875 -((int64_t)diff), 0);
876 ASSERT(!error);
877 if (error)
878 goto done;
879 }
880
881 ep = xfs_iext_get_ext(ifp, bma->idx);
882 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
883 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
884 trace_xfs_bmap_pre_update(bma->ip, bma->idx + 2, state, _THIS_IP_);
885 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, bma->idx + 2),
886 nullstartblock((int)temp2));
887 trace_xfs_bmap_post_update(bma->ip, bma->idx + 2, state, _THIS_IP_);
888
889 bma->idx++;
890 da_new = temp + temp2;
891 break;
892
893 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
894 case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
895 case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
896 case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
897 case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
898 case BMAP_LEFT_CONTIG:
899 case BMAP_RIGHT_CONTIG:
900 /*
901 * These cases are all impossible.
902 */
903 ASSERT(0);
904 }
905
906 /* convert to a btree if necessary */
907 if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
908 int tmp_logflags; /* partial log flag return val */
909
910 ASSERT(bma->cur == NULL);
911 error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
912 bma->firstblock, bma->flist, &bma->cur,
913 da_old > 0, &tmp_logflags, XFS_DATA_FORK);
914 bma->logflags |= tmp_logflags;
915 if (error)
916 goto done;
917 }
918
919 /* adjust for changes in reserved delayed indirect blocks */
920 if (da_old || da_new) {
921 temp = da_new;
922 if (bma->cur)
923 temp += bma->cur->bc_private.b.allocated;
924 ASSERT(temp <= da_old);
925 if (temp < da_old)
926 xfs_icsb_modify_counters(bma->ip->i_mount,
927 XFS_SBS_FDBLOCKS,
928 (int64_t)(da_old - temp), 0);
929 }
930
931 /* clear out the allocated field, done with it now in any case. */
932 if (bma->cur)
933 bma->cur->bc_private.b.allocated = 0;
934
935 xfs_bmap_check_leaf_extents(bma->cur, bma->ip, XFS_DATA_FORK);
936 done:
937 bma->logflags |= rval;
938 return error;
939 #undef LEFT
940 #undef RIGHT
941 #undef PREV
942 }
943
944 /*
945 * Convert an unwritten allocation to a real allocation or vice versa.
946 */
947 STATIC int /* error */
xfs_bmap_add_extent_unwritten_real(struct xfs_trans * tp,xfs_inode_t * ip,xfs_extnum_t * idx,xfs_btree_cur_t ** curp,xfs_bmbt_irec_t * new,xfs_fsblock_t * first,xfs_bmap_free_t * flist,int * logflagsp)948 xfs_bmap_add_extent_unwritten_real(
949 struct xfs_trans *tp,
950 xfs_inode_t *ip, /* incore inode pointer */
951 xfs_extnum_t *idx, /* extent number to update/insert */
952 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
953 xfs_bmbt_irec_t *new, /* new data to add to file extents */
954 xfs_fsblock_t *first, /* pointer to firstblock variable */
955 xfs_bmap_free_t *flist, /* list of extents to be freed */
956 int *logflagsp) /* inode logging flags */
957 {
958 xfs_btree_cur_t *cur; /* btree cursor */
959 xfs_bmbt_rec_host_t *ep; /* extent entry for idx */
960 int error; /* error return value */
961 int i; /* temp state */
962 xfs_ifork_t *ifp; /* inode fork pointer */
963 xfs_fileoff_t new_endoff; /* end offset of new entry */
964 xfs_exntst_t newext; /* new extent state */
965 xfs_exntst_t oldext; /* old extent state */
966 xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
967 /* left is 0, right is 1, prev is 2 */
968 int rval=0; /* return value (logging flags) */
969 int state = 0;/* state bits, accessed thru macros */
970
971 *logflagsp = 0;
972
973 cur = *curp;
974 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
975
976 ASSERT(*idx >= 0);
977 ASSERT(*idx <= ifp->if_bytes / sizeof(struct xfs_bmbt_rec));
978 ASSERT(!isnullstartblock(new->br_startblock));
979
980 XFS_STATS_INC(xs_add_exlist);
981
982 #define LEFT r[0]
983 #define RIGHT r[1]
984 #define PREV r[2]
985
986 /*
987 * Set up a bunch of variables to make the tests simpler.
988 */
989 error = 0;
990 ep = xfs_iext_get_ext(ifp, *idx);
991 xfs_bmbt_get_all(ep, &PREV);
992 newext = new->br_state;
993 oldext = (newext == XFS_EXT_UNWRITTEN) ?
994 XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
995 ASSERT(PREV.br_state == oldext);
996 new_endoff = new->br_startoff + new->br_blockcount;
997 ASSERT(PREV.br_startoff <= new->br_startoff);
998 ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
999
1000 /*
1001 * Set flags determining what part of the previous oldext allocation
1002 * extent is being replaced by a newext allocation.
1003 */
1004 if (PREV.br_startoff == new->br_startoff)
1005 state |= BMAP_LEFT_FILLING;
1006 if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
1007 state |= BMAP_RIGHT_FILLING;
1008
1009 /*
1010 * Check and set flags if this segment has a left neighbor.
1011 * Don't set contiguous if the combined extent would be too large.
1012 */
1013 if (*idx > 0) {
1014 state |= BMAP_LEFT_VALID;
1015 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &LEFT);
1016
1017 if (isnullstartblock(LEFT.br_startblock))
1018 state |= BMAP_LEFT_DELAY;
1019 }
1020
1021 if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
1022 LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
1023 LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
1024 LEFT.br_state == newext &&
1025 LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
1026 state |= BMAP_LEFT_CONTIG;
1027
1028 /*
1029 * Check and set flags if this segment has a right neighbor.
1030 * Don't set contiguous if the combined extent would be too large.
1031 * Also check for all-three-contiguous being too large.
1032 */
1033 if (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1) {
1034 state |= BMAP_RIGHT_VALID;
1035 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx + 1), &RIGHT);
1036 if (isnullstartblock(RIGHT.br_startblock))
1037 state |= BMAP_RIGHT_DELAY;
1038 }
1039
1040 if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
1041 new_endoff == RIGHT.br_startoff &&
1042 new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
1043 newext == RIGHT.br_state &&
1044 new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
1045 ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
1046 BMAP_RIGHT_FILLING)) !=
1047 (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
1048 BMAP_RIGHT_FILLING) ||
1049 LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
1050 <= MAXEXTLEN))
1051 state |= BMAP_RIGHT_CONTIG;
1052
1053 /*
1054 * Switch out based on the FILLING and CONTIG state bits.
1055 */
1056 switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
1057 BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
1058 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
1059 BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1060 /*
1061 * Setting all of a previous oldext extent to newext.
1062 * The left and right neighbors are both contiguous with new.
1063 */
1064 --*idx;
1065
1066 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1067 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
1068 LEFT.br_blockcount + PREV.br_blockcount +
1069 RIGHT.br_blockcount);
1070 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1071
1072 xfs_iext_remove(ip, *idx + 1, 2, state);
1073 ip->i_d.di_nextents -= 2;
1074 if (cur == NULL)
1075 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1076 else {
1077 rval = XFS_ILOG_CORE;
1078 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1079 RIGHT.br_startblock,
1080 RIGHT.br_blockcount, &i)))
1081 goto done;
1082 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1083 if ((error = xfs_btree_delete(cur, &i)))
1084 goto done;
1085 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1086 if ((error = xfs_btree_decrement(cur, 0, &i)))
1087 goto done;
1088 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1089 if ((error = xfs_btree_delete(cur, &i)))
1090 goto done;
1091 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1092 if ((error = xfs_btree_decrement(cur, 0, &i)))
1093 goto done;
1094 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1095 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1096 LEFT.br_startblock,
1097 LEFT.br_blockcount + PREV.br_blockcount +
1098 RIGHT.br_blockcount, LEFT.br_state)))
1099 goto done;
1100 }
1101 break;
1102
1103 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
1104 /*
1105 * Setting all of a previous oldext extent to newext.
1106 * The left neighbor is contiguous, the right is not.
1107 */
1108 --*idx;
1109
1110 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1111 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
1112 LEFT.br_blockcount + PREV.br_blockcount);
1113 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1114
1115 xfs_iext_remove(ip, *idx + 1, 1, state);
1116 ip->i_d.di_nextents--;
1117 if (cur == NULL)
1118 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1119 else {
1120 rval = XFS_ILOG_CORE;
1121 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1122 PREV.br_startblock, PREV.br_blockcount,
1123 &i)))
1124 goto done;
1125 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1126 if ((error = xfs_btree_delete(cur, &i)))
1127 goto done;
1128 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1129 if ((error = xfs_btree_decrement(cur, 0, &i)))
1130 goto done;
1131 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1132 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1133 LEFT.br_startblock,
1134 LEFT.br_blockcount + PREV.br_blockcount,
1135 LEFT.br_state)))
1136 goto done;
1137 }
1138 break;
1139
1140 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1141 /*
1142 * Setting all of a previous oldext extent to newext.
1143 * The right neighbor is contiguous, the left is not.
1144 */
1145 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1146 xfs_bmbt_set_blockcount(ep,
1147 PREV.br_blockcount + RIGHT.br_blockcount);
1148 xfs_bmbt_set_state(ep, newext);
1149 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1150 xfs_iext_remove(ip, *idx + 1, 1, state);
1151 ip->i_d.di_nextents--;
1152 if (cur == NULL)
1153 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1154 else {
1155 rval = XFS_ILOG_CORE;
1156 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1157 RIGHT.br_startblock,
1158 RIGHT.br_blockcount, &i)))
1159 goto done;
1160 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1161 if ((error = xfs_btree_delete(cur, &i)))
1162 goto done;
1163 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1164 if ((error = xfs_btree_decrement(cur, 0, &i)))
1165 goto done;
1166 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1167 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1168 new->br_startblock,
1169 new->br_blockcount + RIGHT.br_blockcount,
1170 newext)))
1171 goto done;
1172 }
1173 break;
1174
1175 case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
1176 /*
1177 * Setting all of a previous oldext extent to newext.
1178 * Neither the left nor right neighbors are contiguous with
1179 * the new one.
1180 */
1181 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1182 xfs_bmbt_set_state(ep, newext);
1183 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1184
1185 if (cur == NULL)
1186 rval = XFS_ILOG_DEXT;
1187 else {
1188 rval = 0;
1189 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1190 new->br_startblock, new->br_blockcount,
1191 &i)))
1192 goto done;
1193 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1194 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1195 new->br_startblock, new->br_blockcount,
1196 newext)))
1197 goto done;
1198 }
1199 break;
1200
1201 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
1202 /*
1203 * Setting the first part of a previous oldext extent to newext.
1204 * The left neighbor is contiguous.
1205 */
1206 trace_xfs_bmap_pre_update(ip, *idx - 1, state, _THIS_IP_);
1207 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx - 1),
1208 LEFT.br_blockcount + new->br_blockcount);
1209 xfs_bmbt_set_startoff(ep,
1210 PREV.br_startoff + new->br_blockcount);
1211 trace_xfs_bmap_post_update(ip, *idx - 1, state, _THIS_IP_);
1212
1213 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1214 xfs_bmbt_set_startblock(ep,
1215 new->br_startblock + new->br_blockcount);
1216 xfs_bmbt_set_blockcount(ep,
1217 PREV.br_blockcount - new->br_blockcount);
1218 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1219
1220 --*idx;
1221
1222 if (cur == NULL)
1223 rval = XFS_ILOG_DEXT;
1224 else {
1225 rval = 0;
1226 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1227 PREV.br_startblock, PREV.br_blockcount,
1228 &i)))
1229 goto done;
1230 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1231 if ((error = xfs_bmbt_update(cur,
1232 PREV.br_startoff + new->br_blockcount,
1233 PREV.br_startblock + new->br_blockcount,
1234 PREV.br_blockcount - new->br_blockcount,
1235 oldext)))
1236 goto done;
1237 if ((error = xfs_btree_decrement(cur, 0, &i)))
1238 goto done;
1239 error = xfs_bmbt_update(cur, LEFT.br_startoff,
1240 LEFT.br_startblock,
1241 LEFT.br_blockcount + new->br_blockcount,
1242 LEFT.br_state);
1243 if (error)
1244 goto done;
1245 }
1246 break;
1247
1248 case BMAP_LEFT_FILLING:
1249 /*
1250 * Setting the first part of a previous oldext extent to newext.
1251 * The left neighbor is not contiguous.
1252 */
1253 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1254 ASSERT(ep && xfs_bmbt_get_state(ep) == oldext);
1255 xfs_bmbt_set_startoff(ep, new_endoff);
1256 xfs_bmbt_set_blockcount(ep,
1257 PREV.br_blockcount - new->br_blockcount);
1258 xfs_bmbt_set_startblock(ep,
1259 new->br_startblock + new->br_blockcount);
1260 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1261
1262 xfs_iext_insert(ip, *idx, 1, new, state);
1263 ip->i_d.di_nextents++;
1264 if (cur == NULL)
1265 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1266 else {
1267 rval = XFS_ILOG_CORE;
1268 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1269 PREV.br_startblock, PREV.br_blockcount,
1270 &i)))
1271 goto done;
1272 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1273 if ((error = xfs_bmbt_update(cur,
1274 PREV.br_startoff + new->br_blockcount,
1275 PREV.br_startblock + new->br_blockcount,
1276 PREV.br_blockcount - new->br_blockcount,
1277 oldext)))
1278 goto done;
1279 cur->bc_rec.b = *new;
1280 if ((error = xfs_btree_insert(cur, &i)))
1281 goto done;
1282 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1283 }
1284 break;
1285
1286 case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1287 /*
1288 * Setting the last part of a previous oldext extent to newext.
1289 * The right neighbor is contiguous with the new allocation.
1290 */
1291 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1292 xfs_bmbt_set_blockcount(ep,
1293 PREV.br_blockcount - new->br_blockcount);
1294 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1295
1296 ++*idx;
1297
1298 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1299 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
1300 new->br_startoff, new->br_startblock,
1301 new->br_blockcount + RIGHT.br_blockcount, newext);
1302 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1303
1304 if (cur == NULL)
1305 rval = XFS_ILOG_DEXT;
1306 else {
1307 rval = 0;
1308 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1309 PREV.br_startblock,
1310 PREV.br_blockcount, &i)))
1311 goto done;
1312 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1313 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
1314 PREV.br_startblock,
1315 PREV.br_blockcount - new->br_blockcount,
1316 oldext)))
1317 goto done;
1318 if ((error = xfs_btree_increment(cur, 0, &i)))
1319 goto done;
1320 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1321 new->br_startblock,
1322 new->br_blockcount + RIGHT.br_blockcount,
1323 newext)))
1324 goto done;
1325 }
1326 break;
1327
1328 case BMAP_RIGHT_FILLING:
1329 /*
1330 * Setting the last part of a previous oldext extent to newext.
1331 * The right neighbor is not contiguous.
1332 */
1333 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1334 xfs_bmbt_set_blockcount(ep,
1335 PREV.br_blockcount - new->br_blockcount);
1336 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1337
1338 ++*idx;
1339 xfs_iext_insert(ip, *idx, 1, new, state);
1340
1341 ip->i_d.di_nextents++;
1342 if (cur == NULL)
1343 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1344 else {
1345 rval = XFS_ILOG_CORE;
1346 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1347 PREV.br_startblock, PREV.br_blockcount,
1348 &i)))
1349 goto done;
1350 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1351 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
1352 PREV.br_startblock,
1353 PREV.br_blockcount - new->br_blockcount,
1354 oldext)))
1355 goto done;
1356 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1357 new->br_startblock, new->br_blockcount,
1358 &i)))
1359 goto done;
1360 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1361 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1362 if ((error = xfs_btree_insert(cur, &i)))
1363 goto done;
1364 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1365 }
1366 break;
1367
1368 case 0:
1369 /*
1370 * Setting the middle part of a previous oldext extent to
1371 * newext. Contiguity is impossible here.
1372 * One extent becomes three extents.
1373 */
1374 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1375 xfs_bmbt_set_blockcount(ep,
1376 new->br_startoff - PREV.br_startoff);
1377 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1378
1379 r[0] = *new;
1380 r[1].br_startoff = new_endoff;
1381 r[1].br_blockcount =
1382 PREV.br_startoff + PREV.br_blockcount - new_endoff;
1383 r[1].br_startblock = new->br_startblock + new->br_blockcount;
1384 r[1].br_state = oldext;
1385
1386 ++*idx;
1387 xfs_iext_insert(ip, *idx, 2, &r[0], state);
1388
1389 ip->i_d.di_nextents += 2;
1390 if (cur == NULL)
1391 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1392 else {
1393 rval = XFS_ILOG_CORE;
1394 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1395 PREV.br_startblock, PREV.br_blockcount,
1396 &i)))
1397 goto done;
1398 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1399 /* new right extent - oldext */
1400 if ((error = xfs_bmbt_update(cur, r[1].br_startoff,
1401 r[1].br_startblock, r[1].br_blockcount,
1402 r[1].br_state)))
1403 goto done;
1404 /* new left extent - oldext */
1405 cur->bc_rec.b = PREV;
1406 cur->bc_rec.b.br_blockcount =
1407 new->br_startoff - PREV.br_startoff;
1408 if ((error = xfs_btree_insert(cur, &i)))
1409 goto done;
1410 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1411 /*
1412 * Reset the cursor to the position of the new extent
1413 * we are about to insert as we can't trust it after
1414 * the previous insert.
1415 */
1416 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1417 new->br_startblock, new->br_blockcount,
1418 &i)))
1419 goto done;
1420 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1421 /* new middle extent - newext */
1422 cur->bc_rec.b.br_state = new->br_state;
1423 if ((error = xfs_btree_insert(cur, &i)))
1424 goto done;
1425 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1426 }
1427 break;
1428
1429 case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1430 case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1431 case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
1432 case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
1433 case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1434 case BMAP_LEFT_CONTIG:
1435 case BMAP_RIGHT_CONTIG:
1436 /*
1437 * These cases are all impossible.
1438 */
1439 ASSERT(0);
1440 }
1441
1442 /* convert to a btree if necessary */
1443 if (xfs_bmap_needs_btree(ip, XFS_DATA_FORK)) {
1444 int tmp_logflags; /* partial log flag return val */
1445
1446 ASSERT(cur == NULL);
1447 error = xfs_bmap_extents_to_btree(tp, ip, first, flist, &cur,
1448 0, &tmp_logflags, XFS_DATA_FORK);
1449 *logflagsp |= tmp_logflags;
1450 if (error)
1451 goto done;
1452 }
1453
1454 /* clear out the allocated field, done with it now in any case. */
1455 if (cur) {
1456 cur->bc_private.b.allocated = 0;
1457 *curp = cur;
1458 }
1459
1460 xfs_bmap_check_leaf_extents(*curp, ip, XFS_DATA_FORK);
1461 done:
1462 *logflagsp |= rval;
1463 return error;
1464 #undef LEFT
1465 #undef RIGHT
1466 #undef PREV
1467 }
1468
1469 /*
1470 * Convert a hole to a delayed allocation.
1471 */
1472 STATIC void
xfs_bmap_add_extent_hole_delay(xfs_inode_t * ip,xfs_extnum_t * idx,xfs_bmbt_irec_t * new)1473 xfs_bmap_add_extent_hole_delay(
1474 xfs_inode_t *ip, /* incore inode pointer */
1475 xfs_extnum_t *idx, /* extent number to update/insert */
1476 xfs_bmbt_irec_t *new) /* new data to add to file extents */
1477 {
1478 xfs_ifork_t *ifp; /* inode fork pointer */
1479 xfs_bmbt_irec_t left; /* left neighbor extent entry */
1480 xfs_filblks_t newlen=0; /* new indirect size */
1481 xfs_filblks_t oldlen=0; /* old indirect size */
1482 xfs_bmbt_irec_t right; /* right neighbor extent entry */
1483 int state; /* state bits, accessed thru macros */
1484 xfs_filblks_t temp=0; /* temp for indirect calculations */
1485
1486 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1487 state = 0;
1488 ASSERT(isnullstartblock(new->br_startblock));
1489
1490 /*
1491 * Check and set flags if this segment has a left neighbor
1492 */
1493 if (*idx > 0) {
1494 state |= BMAP_LEFT_VALID;
1495 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &left);
1496
1497 if (isnullstartblock(left.br_startblock))
1498 state |= BMAP_LEFT_DELAY;
1499 }
1500
1501 /*
1502 * Check and set flags if the current (right) segment exists.
1503 * If it doesn't exist, we're converting the hole at end-of-file.
1504 */
1505 if (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
1506 state |= BMAP_RIGHT_VALID;
1507 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx), &right);
1508
1509 if (isnullstartblock(right.br_startblock))
1510 state |= BMAP_RIGHT_DELAY;
1511 }
1512
1513 /*
1514 * Set contiguity flags on the left and right neighbors.
1515 * Don't let extents get too large, even if the pieces are contiguous.
1516 */
1517 if ((state & BMAP_LEFT_VALID) && (state & BMAP_LEFT_DELAY) &&
1518 left.br_startoff + left.br_blockcount == new->br_startoff &&
1519 left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
1520 state |= BMAP_LEFT_CONTIG;
1521
1522 if ((state & BMAP_RIGHT_VALID) && (state & BMAP_RIGHT_DELAY) &&
1523 new->br_startoff + new->br_blockcount == right.br_startoff &&
1524 new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
1525 (!(state & BMAP_LEFT_CONTIG) ||
1526 (left.br_blockcount + new->br_blockcount +
1527 right.br_blockcount <= MAXEXTLEN)))
1528 state |= BMAP_RIGHT_CONTIG;
1529
1530 /*
1531 * Switch out based on the contiguity flags.
1532 */
1533 switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
1534 case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1535 /*
1536 * New allocation is contiguous with delayed allocations
1537 * on the left and on the right.
1538 * Merge all three into a single extent record.
1539 */
1540 --*idx;
1541 temp = left.br_blockcount + new->br_blockcount +
1542 right.br_blockcount;
1543
1544 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1545 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
1546 oldlen = startblockval(left.br_startblock) +
1547 startblockval(new->br_startblock) +
1548 startblockval(right.br_startblock);
1549 newlen = xfs_bmap_worst_indlen(ip, temp);
1550 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
1551 nullstartblock((int)newlen));
1552 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1553
1554 xfs_iext_remove(ip, *idx + 1, 1, state);
1555 break;
1556
1557 case BMAP_LEFT_CONTIG:
1558 /*
1559 * New allocation is contiguous with a delayed allocation
1560 * on the left.
1561 * Merge the new allocation with the left neighbor.
1562 */
1563 --*idx;
1564 temp = left.br_blockcount + new->br_blockcount;
1565
1566 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1567 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
1568 oldlen = startblockval(left.br_startblock) +
1569 startblockval(new->br_startblock);
1570 newlen = xfs_bmap_worst_indlen(ip, temp);
1571 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
1572 nullstartblock((int)newlen));
1573 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1574 break;
1575
1576 case BMAP_RIGHT_CONTIG:
1577 /*
1578 * New allocation is contiguous with a delayed allocation
1579 * on the right.
1580 * Merge the new allocation with the right neighbor.
1581 */
1582 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1583 temp = new->br_blockcount + right.br_blockcount;
1584 oldlen = startblockval(new->br_startblock) +
1585 startblockval(right.br_startblock);
1586 newlen = xfs_bmap_worst_indlen(ip, temp);
1587 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
1588 new->br_startoff,
1589 nullstartblock((int)newlen), temp, right.br_state);
1590 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1591 break;
1592
1593 case 0:
1594 /*
1595 * New allocation is not contiguous with another
1596 * delayed allocation.
1597 * Insert a new entry.
1598 */
1599 oldlen = newlen = 0;
1600 xfs_iext_insert(ip, *idx, 1, new, state);
1601 break;
1602 }
1603 if (oldlen != newlen) {
1604 ASSERT(oldlen > newlen);
1605 xfs_icsb_modify_counters(ip->i_mount, XFS_SBS_FDBLOCKS,
1606 (int64_t)(oldlen - newlen), 0);
1607 /*
1608 * Nothing to do for disk quota accounting here.
1609 */
1610 }
1611 }
1612
1613 /*
1614 * Convert a hole to a real allocation.
1615 */
1616 STATIC int /* error */
xfs_bmap_add_extent_hole_real(struct xfs_bmalloca * bma,int whichfork)1617 xfs_bmap_add_extent_hole_real(
1618 struct xfs_bmalloca *bma,
1619 int whichfork)
1620 {
1621 struct xfs_bmbt_irec *new = &bma->got;
1622 int error; /* error return value */
1623 int i; /* temp state */
1624 xfs_ifork_t *ifp; /* inode fork pointer */
1625 xfs_bmbt_irec_t left; /* left neighbor extent entry */
1626 xfs_bmbt_irec_t right; /* right neighbor extent entry */
1627 int rval=0; /* return value (logging flags) */
1628 int state; /* state bits, accessed thru macros */
1629
1630 ifp = XFS_IFORK_PTR(bma->ip, whichfork);
1631
1632 ASSERT(bma->idx >= 0);
1633 ASSERT(bma->idx <= ifp->if_bytes / sizeof(struct xfs_bmbt_rec));
1634 ASSERT(!isnullstartblock(new->br_startblock));
1635 ASSERT(!bma->cur ||
1636 !(bma->cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL));
1637
1638 XFS_STATS_INC(xs_add_exlist);
1639
1640 state = 0;
1641 if (whichfork == XFS_ATTR_FORK)
1642 state |= BMAP_ATTRFORK;
1643
1644 /*
1645 * Check and set flags if this segment has a left neighbor.
1646 */
1647 if (bma->idx > 0) {
1648 state |= BMAP_LEFT_VALID;
1649 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1), &left);
1650 if (isnullstartblock(left.br_startblock))
1651 state |= BMAP_LEFT_DELAY;
1652 }
1653
1654 /*
1655 * Check and set flags if this segment has a current value.
1656 * Not true if we're inserting into the "hole" at eof.
1657 */
1658 if (bma->idx < ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
1659 state |= BMAP_RIGHT_VALID;
1660 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &right);
1661 if (isnullstartblock(right.br_startblock))
1662 state |= BMAP_RIGHT_DELAY;
1663 }
1664
1665 /*
1666 * We're inserting a real allocation between "left" and "right".
1667 * Set the contiguity flags. Don't let extents get too large.
1668 */
1669 if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
1670 left.br_startoff + left.br_blockcount == new->br_startoff &&
1671 left.br_startblock + left.br_blockcount == new->br_startblock &&
1672 left.br_state == new->br_state &&
1673 left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
1674 state |= BMAP_LEFT_CONTIG;
1675
1676 if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
1677 new->br_startoff + new->br_blockcount == right.br_startoff &&
1678 new->br_startblock + new->br_blockcount == right.br_startblock &&
1679 new->br_state == right.br_state &&
1680 new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
1681 (!(state & BMAP_LEFT_CONTIG) ||
1682 left.br_blockcount + new->br_blockcount +
1683 right.br_blockcount <= MAXEXTLEN))
1684 state |= BMAP_RIGHT_CONTIG;
1685
1686 error = 0;
1687 /*
1688 * Select which case we're in here, and implement it.
1689 */
1690 switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
1691 case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1692 /*
1693 * New allocation is contiguous with real allocations on the
1694 * left and on the right.
1695 * Merge all three into a single extent record.
1696 */
1697 --bma->idx;
1698 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1699 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
1700 left.br_blockcount + new->br_blockcount +
1701 right.br_blockcount);
1702 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1703
1704 xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
1705
1706 XFS_IFORK_NEXT_SET(bma->ip, whichfork,
1707 XFS_IFORK_NEXTENTS(bma->ip, whichfork) - 1);
1708 if (bma->cur == NULL) {
1709 rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
1710 } else {
1711 rval = XFS_ILOG_CORE;
1712 error = xfs_bmbt_lookup_eq(bma->cur, right.br_startoff,
1713 right.br_startblock, right.br_blockcount,
1714 &i);
1715 if (error)
1716 goto done;
1717 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1718 error = xfs_btree_delete(bma->cur, &i);
1719 if (error)
1720 goto done;
1721 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1722 error = xfs_btree_decrement(bma->cur, 0, &i);
1723 if (error)
1724 goto done;
1725 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1726 error = xfs_bmbt_update(bma->cur, left.br_startoff,
1727 left.br_startblock,
1728 left.br_blockcount +
1729 new->br_blockcount +
1730 right.br_blockcount,
1731 left.br_state);
1732 if (error)
1733 goto done;
1734 }
1735 break;
1736
1737 case BMAP_LEFT_CONTIG:
1738 /*
1739 * New allocation is contiguous with a real allocation
1740 * on the left.
1741 * Merge the new allocation with the left neighbor.
1742 */
1743 --bma->idx;
1744 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1745 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
1746 left.br_blockcount + new->br_blockcount);
1747 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1748
1749 if (bma->cur == NULL) {
1750 rval = xfs_ilog_fext(whichfork);
1751 } else {
1752 rval = 0;
1753 error = xfs_bmbt_lookup_eq(bma->cur, left.br_startoff,
1754 left.br_startblock, left.br_blockcount,
1755 &i);
1756 if (error)
1757 goto done;
1758 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1759 error = xfs_bmbt_update(bma->cur, left.br_startoff,
1760 left.br_startblock,
1761 left.br_blockcount +
1762 new->br_blockcount,
1763 left.br_state);
1764 if (error)
1765 goto done;
1766 }
1767 break;
1768
1769 case BMAP_RIGHT_CONTIG:
1770 /*
1771 * New allocation is contiguous with a real allocation
1772 * on the right.
1773 * Merge the new allocation with the right neighbor.
1774 */
1775 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1776 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, bma->idx),
1777 new->br_startoff, new->br_startblock,
1778 new->br_blockcount + right.br_blockcount,
1779 right.br_state);
1780 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1781
1782 if (bma->cur == NULL) {
1783 rval = xfs_ilog_fext(whichfork);
1784 } else {
1785 rval = 0;
1786 error = xfs_bmbt_lookup_eq(bma->cur,
1787 right.br_startoff,
1788 right.br_startblock,
1789 right.br_blockcount, &i);
1790 if (error)
1791 goto done;
1792 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1793 error = xfs_bmbt_update(bma->cur, new->br_startoff,
1794 new->br_startblock,
1795 new->br_blockcount +
1796 right.br_blockcount,
1797 right.br_state);
1798 if (error)
1799 goto done;
1800 }
1801 break;
1802
1803 case 0:
1804 /*
1805 * New allocation is not contiguous with another
1806 * real allocation.
1807 * Insert a new entry.
1808 */
1809 xfs_iext_insert(bma->ip, bma->idx, 1, new, state);
1810 XFS_IFORK_NEXT_SET(bma->ip, whichfork,
1811 XFS_IFORK_NEXTENTS(bma->ip, whichfork) + 1);
1812 if (bma->cur == NULL) {
1813 rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
1814 } else {
1815 rval = XFS_ILOG_CORE;
1816 error = xfs_bmbt_lookup_eq(bma->cur,
1817 new->br_startoff,
1818 new->br_startblock,
1819 new->br_blockcount, &i);
1820 if (error)
1821 goto done;
1822 XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1823 bma->cur->bc_rec.b.br_state = new->br_state;
1824 error = xfs_btree_insert(bma->cur, &i);
1825 if (error)
1826 goto done;
1827 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1828 }
1829 break;
1830 }
1831
1832 /* convert to a btree if necessary */
1833 if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
1834 int tmp_logflags; /* partial log flag return val */
1835
1836 ASSERT(bma->cur == NULL);
1837 error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
1838 bma->firstblock, bma->flist, &bma->cur,
1839 0, &tmp_logflags, whichfork);
1840 bma->logflags |= tmp_logflags;
1841 if (error)
1842 goto done;
1843 }
1844
1845 /* clear out the allocated field, done with it now in any case. */
1846 if (bma->cur)
1847 bma->cur->bc_private.b.allocated = 0;
1848
1849 xfs_bmap_check_leaf_extents(bma->cur, bma->ip, whichfork);
1850 done:
1851 bma->logflags |= rval;
1852 return error;
1853 }
1854
1855 /*
1856 * Adjust the size of the new extent based on di_extsize and rt extsize.
1857 */
1858 STATIC int
xfs_bmap_extsize_align(xfs_mount_t * mp,xfs_bmbt_irec_t * gotp,xfs_bmbt_irec_t * prevp,xfs_extlen_t extsz,int rt,int eof,int delay,int convert,xfs_fileoff_t * offp,xfs_extlen_t * lenp)1859 xfs_bmap_extsize_align(
1860 xfs_mount_t *mp,
1861 xfs_bmbt_irec_t *gotp, /* next extent pointer */
1862 xfs_bmbt_irec_t *prevp, /* previous extent pointer */
1863 xfs_extlen_t extsz, /* align to this extent size */
1864 int rt, /* is this a realtime inode? */
1865 int eof, /* is extent at end-of-file? */
1866 int delay, /* creating delalloc extent? */
1867 int convert, /* overwriting unwritten extent? */
1868 xfs_fileoff_t *offp, /* in/out: aligned offset */
1869 xfs_extlen_t *lenp) /* in/out: aligned length */
1870 {
1871 xfs_fileoff_t orig_off; /* original offset */
1872 xfs_extlen_t orig_alen; /* original length */
1873 xfs_fileoff_t orig_end; /* original off+len */
1874 xfs_fileoff_t nexto; /* next file offset */
1875 xfs_fileoff_t prevo; /* previous file offset */
1876 xfs_fileoff_t align_off; /* temp for offset */
1877 xfs_extlen_t align_alen; /* temp for length */
1878 xfs_extlen_t temp; /* temp for calculations */
1879
1880 if (convert)
1881 return 0;
1882
1883 orig_off = align_off = *offp;
1884 orig_alen = align_alen = *lenp;
1885 orig_end = orig_off + orig_alen;
1886
1887 /*
1888 * If this request overlaps an existing extent, then don't
1889 * attempt to perform any additional alignment.
1890 */
1891 if (!delay && !eof &&
1892 (orig_off >= gotp->br_startoff) &&
1893 (orig_end <= gotp->br_startoff + gotp->br_blockcount)) {
1894 return 0;
1895 }
1896
1897 /*
1898 * If the file offset is unaligned vs. the extent size
1899 * we need to align it. This will be possible unless
1900 * the file was previously written with a kernel that didn't
1901 * perform this alignment, or if a truncate shot us in the
1902 * foot.
1903 */
1904 temp = do_mod(orig_off, extsz);
1905 if (temp) {
1906 align_alen += temp;
1907 align_off -= temp;
1908 }
1909 /*
1910 * Same adjustment for the end of the requested area.
1911 */
1912 if ((temp = (align_alen % extsz))) {
1913 align_alen += extsz - temp;
1914 }
1915 /*
1916 * If the previous block overlaps with this proposed allocation
1917 * then move the start forward without adjusting the length.
1918 */
1919 if (prevp->br_startoff != NULLFILEOFF) {
1920 if (prevp->br_startblock == HOLESTARTBLOCK)
1921 prevo = prevp->br_startoff;
1922 else
1923 prevo = prevp->br_startoff + prevp->br_blockcount;
1924 } else
1925 prevo = 0;
1926 if (align_off != orig_off && align_off < prevo)
1927 align_off = prevo;
1928 /*
1929 * If the next block overlaps with this proposed allocation
1930 * then move the start back without adjusting the length,
1931 * but not before offset 0.
1932 * This may of course make the start overlap previous block,
1933 * and if we hit the offset 0 limit then the next block
1934 * can still overlap too.
1935 */
1936 if (!eof && gotp->br_startoff != NULLFILEOFF) {
1937 if ((delay && gotp->br_startblock == HOLESTARTBLOCK) ||
1938 (!delay && gotp->br_startblock == DELAYSTARTBLOCK))
1939 nexto = gotp->br_startoff + gotp->br_blockcount;
1940 else
1941 nexto = gotp->br_startoff;
1942 } else
1943 nexto = NULLFILEOFF;
1944 if (!eof &&
1945 align_off + align_alen != orig_end &&
1946 align_off + align_alen > nexto)
1947 align_off = nexto > align_alen ? nexto - align_alen : 0;
1948 /*
1949 * If we're now overlapping the next or previous extent that
1950 * means we can't fit an extsz piece in this hole. Just move
1951 * the start forward to the first valid spot and set
1952 * the length so we hit the end.
1953 */
1954 if (align_off != orig_off && align_off < prevo)
1955 align_off = prevo;
1956 if (align_off + align_alen != orig_end &&
1957 align_off + align_alen > nexto &&
1958 nexto != NULLFILEOFF) {
1959 ASSERT(nexto > prevo);
1960 align_alen = nexto - align_off;
1961 }
1962
1963 /*
1964 * If realtime, and the result isn't a multiple of the realtime
1965 * extent size we need to remove blocks until it is.
1966 */
1967 if (rt && (temp = (align_alen % mp->m_sb.sb_rextsize))) {
1968 /*
1969 * We're not covering the original request, or
1970 * we won't be able to once we fix the length.
1971 */
1972 if (orig_off < align_off ||
1973 orig_end > align_off + align_alen ||
1974 align_alen - temp < orig_alen)
1975 return XFS_ERROR(EINVAL);
1976 /*
1977 * Try to fix it by moving the start up.
1978 */
1979 if (align_off + temp <= orig_off) {
1980 align_alen -= temp;
1981 align_off += temp;
1982 }
1983 /*
1984 * Try to fix it by moving the end in.
1985 */
1986 else if (align_off + align_alen - temp >= orig_end)
1987 align_alen -= temp;
1988 /*
1989 * Set the start to the minimum then trim the length.
1990 */
1991 else {
1992 align_alen -= orig_off - align_off;
1993 align_off = orig_off;
1994 align_alen -= align_alen % mp->m_sb.sb_rextsize;
1995 }
1996 /*
1997 * Result doesn't cover the request, fail it.
1998 */
1999 if (orig_off < align_off || orig_end > align_off + align_alen)
2000 return XFS_ERROR(EINVAL);
2001 } else {
2002 ASSERT(orig_off >= align_off);
2003 ASSERT(orig_end <= align_off + align_alen);
2004 }
2005
2006 #ifdef DEBUG
2007 if (!eof && gotp->br_startoff != NULLFILEOFF)
2008 ASSERT(align_off + align_alen <= gotp->br_startoff);
2009 if (prevp->br_startoff != NULLFILEOFF)
2010 ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount);
2011 #endif
2012
2013 *lenp = align_alen;
2014 *offp = align_off;
2015 return 0;
2016 }
2017
2018 #define XFS_ALLOC_GAP_UNITS 4
2019
2020 STATIC void
xfs_bmap_adjacent(xfs_bmalloca_t * ap)2021 xfs_bmap_adjacent(
2022 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2023 {
2024 xfs_fsblock_t adjust; /* adjustment to block numbers */
2025 xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
2026 xfs_mount_t *mp; /* mount point structure */
2027 int nullfb; /* true if ap->firstblock isn't set */
2028 int rt; /* true if inode is realtime */
2029
2030 #define ISVALID(x,y) \
2031 (rt ? \
2032 (x) < mp->m_sb.sb_rblocks : \
2033 XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
2034 XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
2035 XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
2036
2037 mp = ap->ip->i_mount;
2038 nullfb = *ap->firstblock == NULLFSBLOCK;
2039 rt = XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata;
2040 fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, *ap->firstblock);
2041 /*
2042 * If allocating at eof, and there's a previous real block,
2043 * try to use its last block as our starting point.
2044 */
2045 if (ap->eof && ap->prev.br_startoff != NULLFILEOFF &&
2046 !isnullstartblock(ap->prev.br_startblock) &&
2047 ISVALID(ap->prev.br_startblock + ap->prev.br_blockcount,
2048 ap->prev.br_startblock)) {
2049 ap->blkno = ap->prev.br_startblock + ap->prev.br_blockcount;
2050 /*
2051 * Adjust for the gap between prevp and us.
2052 */
2053 adjust = ap->offset -
2054 (ap->prev.br_startoff + ap->prev.br_blockcount);
2055 if (adjust &&
2056 ISVALID(ap->blkno + adjust, ap->prev.br_startblock))
2057 ap->blkno += adjust;
2058 }
2059 /*
2060 * If not at eof, then compare the two neighbor blocks.
2061 * Figure out whether either one gives us a good starting point,
2062 * and pick the better one.
2063 */
2064 else if (!ap->eof) {
2065 xfs_fsblock_t gotbno; /* right side block number */
2066 xfs_fsblock_t gotdiff=0; /* right side difference */
2067 xfs_fsblock_t prevbno; /* left side block number */
2068 xfs_fsblock_t prevdiff=0; /* left side difference */
2069
2070 /*
2071 * If there's a previous (left) block, select a requested
2072 * start block based on it.
2073 */
2074 if (ap->prev.br_startoff != NULLFILEOFF &&
2075 !isnullstartblock(ap->prev.br_startblock) &&
2076 (prevbno = ap->prev.br_startblock +
2077 ap->prev.br_blockcount) &&
2078 ISVALID(prevbno, ap->prev.br_startblock)) {
2079 /*
2080 * Calculate gap to end of previous block.
2081 */
2082 adjust = prevdiff = ap->offset -
2083 (ap->prev.br_startoff +
2084 ap->prev.br_blockcount);
2085 /*
2086 * Figure the startblock based on the previous block's
2087 * end and the gap size.
2088 * Heuristic!
2089 * If the gap is large relative to the piece we're
2090 * allocating, or using it gives us an invalid block
2091 * number, then just use the end of the previous block.
2092 */
2093 if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->length &&
2094 ISVALID(prevbno + prevdiff,
2095 ap->prev.br_startblock))
2096 prevbno += adjust;
2097 else
2098 prevdiff += adjust;
2099 /*
2100 * If the firstblock forbids it, can't use it,
2101 * must use default.
2102 */
2103 if (!rt && !nullfb &&
2104 XFS_FSB_TO_AGNO(mp, prevbno) != fb_agno)
2105 prevbno = NULLFSBLOCK;
2106 }
2107 /*
2108 * No previous block or can't follow it, just default.
2109 */
2110 else
2111 prevbno = NULLFSBLOCK;
2112 /*
2113 * If there's a following (right) block, select a requested
2114 * start block based on it.
2115 */
2116 if (!isnullstartblock(ap->got.br_startblock)) {
2117 /*
2118 * Calculate gap to start of next block.
2119 */
2120 adjust = gotdiff = ap->got.br_startoff - ap->offset;
2121 /*
2122 * Figure the startblock based on the next block's
2123 * start and the gap size.
2124 */
2125 gotbno = ap->got.br_startblock;
2126 /*
2127 * Heuristic!
2128 * If the gap is large relative to the piece we're
2129 * allocating, or using it gives us an invalid block
2130 * number, then just use the start of the next block
2131 * offset by our length.
2132 */
2133 if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->length &&
2134 ISVALID(gotbno - gotdiff, gotbno))
2135 gotbno -= adjust;
2136 else if (ISVALID(gotbno - ap->length, gotbno)) {
2137 gotbno -= ap->length;
2138 gotdiff += adjust - ap->length;
2139 } else
2140 gotdiff += adjust;
2141 /*
2142 * If the firstblock forbids it, can't use it,
2143 * must use default.
2144 */
2145 if (!rt && !nullfb &&
2146 XFS_FSB_TO_AGNO(mp, gotbno) != fb_agno)
2147 gotbno = NULLFSBLOCK;
2148 }
2149 /*
2150 * No next block, just default.
2151 */
2152 else
2153 gotbno = NULLFSBLOCK;
2154 /*
2155 * If both valid, pick the better one, else the only good
2156 * one, else ap->blkno is already set (to 0 or the inode block).
2157 */
2158 if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
2159 ap->blkno = prevdiff <= gotdiff ? prevbno : gotbno;
2160 else if (prevbno != NULLFSBLOCK)
2161 ap->blkno = prevbno;
2162 else if (gotbno != NULLFSBLOCK)
2163 ap->blkno = gotbno;
2164 }
2165 #undef ISVALID
2166 }
2167
2168 STATIC int
xfs_bmap_rtalloc(xfs_bmalloca_t * ap)2169 xfs_bmap_rtalloc(
2170 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2171 {
2172 xfs_alloctype_t atype = 0; /* type for allocation routines */
2173 int error; /* error return value */
2174 xfs_mount_t *mp; /* mount point structure */
2175 xfs_extlen_t prod = 0; /* product factor for allocators */
2176 xfs_extlen_t ralen = 0; /* realtime allocation length */
2177 xfs_extlen_t align; /* minimum allocation alignment */
2178 xfs_rtblock_t rtb;
2179
2180 mp = ap->ip->i_mount;
2181 align = xfs_get_extsz_hint(ap->ip);
2182 prod = align / mp->m_sb.sb_rextsize;
2183 error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev,
2184 align, 1, ap->eof, 0,
2185 ap->conv, &ap->offset, &ap->length);
2186 if (error)
2187 return error;
2188 ASSERT(ap->length);
2189 ASSERT(ap->length % mp->m_sb.sb_rextsize == 0);
2190
2191 /*
2192 * If the offset & length are not perfectly aligned
2193 * then kill prod, it will just get us in trouble.
2194 */
2195 if (do_mod(ap->offset, align) || ap->length % align)
2196 prod = 1;
2197 /*
2198 * Set ralen to be the actual requested length in rtextents.
2199 */
2200 ralen = ap->length / mp->m_sb.sb_rextsize;
2201 /*
2202 * If the old value was close enough to MAXEXTLEN that
2203 * we rounded up to it, cut it back so it's valid again.
2204 * Note that if it's a really large request (bigger than
2205 * MAXEXTLEN), we don't hear about that number, and can't
2206 * adjust the starting point to match it.
2207 */
2208 if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN)
2209 ralen = MAXEXTLEN / mp->m_sb.sb_rextsize;
2210
2211 /*
2212 * Lock out other modifications to the RT bitmap inode.
2213 */
2214 xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL);
2215 xfs_trans_ijoin(ap->tp, mp->m_rbmip, XFS_ILOCK_EXCL);
2216
2217 /*
2218 * If it's an allocation to an empty file at offset 0,
2219 * pick an extent that will space things out in the rt area.
2220 */
2221 if (ap->eof && ap->offset == 0) {
2222 xfs_rtblock_t uninitialized_var(rtx); /* realtime extent no */
2223
2224 error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx);
2225 if (error)
2226 return error;
2227 ap->blkno = rtx * mp->m_sb.sb_rextsize;
2228 } else {
2229 ap->blkno = 0;
2230 }
2231
2232 xfs_bmap_adjacent(ap);
2233
2234 /*
2235 * Realtime allocation, done through xfs_rtallocate_extent.
2236 */
2237 atype = ap->blkno == 0 ? XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO;
2238 do_div(ap->blkno, mp->m_sb.sb_rextsize);
2239 rtb = ap->blkno;
2240 ap->length = ralen;
2241 if ((error = xfs_rtallocate_extent(ap->tp, ap->blkno, 1, ap->length,
2242 &ralen, atype, ap->wasdel, prod, &rtb)))
2243 return error;
2244 if (rtb == NULLFSBLOCK && prod > 1 &&
2245 (error = xfs_rtallocate_extent(ap->tp, ap->blkno, 1,
2246 ap->length, &ralen, atype,
2247 ap->wasdel, 1, &rtb)))
2248 return error;
2249 ap->blkno = rtb;
2250 if (ap->blkno != NULLFSBLOCK) {
2251 ap->blkno *= mp->m_sb.sb_rextsize;
2252 ralen *= mp->m_sb.sb_rextsize;
2253 ap->length = ralen;
2254 ap->ip->i_d.di_nblocks += ralen;
2255 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
2256 if (ap->wasdel)
2257 ap->ip->i_delayed_blks -= ralen;
2258 /*
2259 * Adjust the disk quota also. This was reserved
2260 * earlier.
2261 */
2262 xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
2263 ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT :
2264 XFS_TRANS_DQ_RTBCOUNT, (long) ralen);
2265 } else {
2266 ap->length = 0;
2267 }
2268 return 0;
2269 }
2270
2271 STATIC int
xfs_bmap_btalloc_nullfb(struct xfs_bmalloca * ap,struct xfs_alloc_arg * args,xfs_extlen_t * blen)2272 xfs_bmap_btalloc_nullfb(
2273 struct xfs_bmalloca *ap,
2274 struct xfs_alloc_arg *args,
2275 xfs_extlen_t *blen)
2276 {
2277 struct xfs_mount *mp = ap->ip->i_mount;
2278 struct xfs_perag *pag;
2279 xfs_agnumber_t ag, startag;
2280 int notinit = 0;
2281 int error;
2282
2283 if (ap->userdata && xfs_inode_is_filestream(ap->ip))
2284 args->type = XFS_ALLOCTYPE_NEAR_BNO;
2285 else
2286 args->type = XFS_ALLOCTYPE_START_BNO;
2287 args->total = ap->total;
2288
2289 /*
2290 * Search for an allocation group with a single extent large enough
2291 * for the request. If one isn't found, then adjust the minimum
2292 * allocation size to the largest space found.
2293 */
2294 startag = ag = XFS_FSB_TO_AGNO(mp, args->fsbno);
2295 if (startag == NULLAGNUMBER)
2296 startag = ag = 0;
2297
2298 pag = xfs_perag_get(mp, ag);
2299 while (*blen < args->maxlen) {
2300 if (!pag->pagf_init) {
2301 error = xfs_alloc_pagf_init(mp, args->tp, ag,
2302 XFS_ALLOC_FLAG_TRYLOCK);
2303 if (error) {
2304 xfs_perag_put(pag);
2305 return error;
2306 }
2307 }
2308
2309 /*
2310 * See xfs_alloc_fix_freelist...
2311 */
2312 if (pag->pagf_init) {
2313 xfs_extlen_t longest;
2314 longest = xfs_alloc_longest_free_extent(mp, pag);
2315 if (*blen < longest)
2316 *blen = longest;
2317 } else
2318 notinit = 1;
2319
2320 if (xfs_inode_is_filestream(ap->ip)) {
2321 if (*blen >= args->maxlen)
2322 break;
2323
2324 if (ap->userdata) {
2325 /*
2326 * If startag is an invalid AG, we've
2327 * come here once before and
2328 * xfs_filestream_new_ag picked the
2329 * best currently available.
2330 *
2331 * Don't continue looping, since we
2332 * could loop forever.
2333 */
2334 if (startag == NULLAGNUMBER)
2335 break;
2336
2337 error = xfs_filestream_new_ag(ap, &ag);
2338 xfs_perag_put(pag);
2339 if (error)
2340 return error;
2341
2342 /* loop again to set 'blen'*/
2343 startag = NULLAGNUMBER;
2344 pag = xfs_perag_get(mp, ag);
2345 continue;
2346 }
2347 }
2348 if (++ag == mp->m_sb.sb_agcount)
2349 ag = 0;
2350 if (ag == startag)
2351 break;
2352 xfs_perag_put(pag);
2353 pag = xfs_perag_get(mp, ag);
2354 }
2355 xfs_perag_put(pag);
2356
2357 /*
2358 * Since the above loop did a BUF_TRYLOCK, it is
2359 * possible that there is space for this request.
2360 */
2361 if (notinit || *blen < ap->minlen)
2362 args->minlen = ap->minlen;
2363 /*
2364 * If the best seen length is less than the request
2365 * length, use the best as the minimum.
2366 */
2367 else if (*blen < args->maxlen)
2368 args->minlen = *blen;
2369 /*
2370 * Otherwise we've seen an extent as big as maxlen,
2371 * use that as the minimum.
2372 */
2373 else
2374 args->minlen = args->maxlen;
2375
2376 /*
2377 * set the failure fallback case to look in the selected
2378 * AG as the stream may have moved.
2379 */
2380 if (xfs_inode_is_filestream(ap->ip))
2381 ap->blkno = args->fsbno = XFS_AGB_TO_FSB(mp, ag, 0);
2382
2383 return 0;
2384 }
2385
2386 STATIC int
xfs_bmap_btalloc(xfs_bmalloca_t * ap)2387 xfs_bmap_btalloc(
2388 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2389 {
2390 xfs_mount_t *mp; /* mount point structure */
2391 xfs_alloctype_t atype = 0; /* type for allocation routines */
2392 xfs_extlen_t align; /* minimum allocation alignment */
2393 xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
2394 xfs_agnumber_t ag;
2395 xfs_alloc_arg_t args;
2396 xfs_extlen_t blen;
2397 xfs_extlen_t nextminlen = 0;
2398 int nullfb; /* true if ap->firstblock isn't set */
2399 int isaligned;
2400 int tryagain;
2401 int error;
2402
2403 ASSERT(ap->length);
2404
2405 mp = ap->ip->i_mount;
2406 align = ap->userdata ? xfs_get_extsz_hint(ap->ip) : 0;
2407 if (unlikely(align)) {
2408 error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev,
2409 align, 0, ap->eof, 0, ap->conv,
2410 &ap->offset, &ap->length);
2411 ASSERT(!error);
2412 ASSERT(ap->length);
2413 }
2414 nullfb = *ap->firstblock == NULLFSBLOCK;
2415 fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, *ap->firstblock);
2416 if (nullfb) {
2417 if (ap->userdata && xfs_inode_is_filestream(ap->ip)) {
2418 ag = xfs_filestream_lookup_ag(ap->ip);
2419 ag = (ag != NULLAGNUMBER) ? ag : 0;
2420 ap->blkno = XFS_AGB_TO_FSB(mp, ag, 0);
2421 } else {
2422 ap->blkno = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
2423 }
2424 } else
2425 ap->blkno = *ap->firstblock;
2426
2427 xfs_bmap_adjacent(ap);
2428
2429 /*
2430 * If allowed, use ap->blkno; otherwise must use firstblock since
2431 * it's in the right allocation group.
2432 */
2433 if (nullfb || XFS_FSB_TO_AGNO(mp, ap->blkno) == fb_agno)
2434 ;
2435 else
2436 ap->blkno = *ap->firstblock;
2437 /*
2438 * Normal allocation, done through xfs_alloc_vextent.
2439 */
2440 tryagain = isaligned = 0;
2441 args.tp = ap->tp;
2442 args.mp = mp;
2443 args.fsbno = ap->blkno;
2444
2445 /* Trim the allocation back to the maximum an AG can fit. */
2446 args.maxlen = MIN(ap->length, XFS_ALLOC_AG_MAX_USABLE(mp));
2447 args.firstblock = *ap->firstblock;
2448 blen = 0;
2449 if (nullfb) {
2450 error = xfs_bmap_btalloc_nullfb(ap, &args, &blen);
2451 if (error)
2452 return error;
2453 } else if (ap->flist->xbf_low) {
2454 if (xfs_inode_is_filestream(ap->ip))
2455 args.type = XFS_ALLOCTYPE_FIRST_AG;
2456 else
2457 args.type = XFS_ALLOCTYPE_START_BNO;
2458 args.total = args.minlen = ap->minlen;
2459 } else {
2460 args.type = XFS_ALLOCTYPE_NEAR_BNO;
2461 args.total = ap->total;
2462 args.minlen = ap->minlen;
2463 }
2464 /* apply extent size hints if obtained earlier */
2465 if (unlikely(align)) {
2466 args.prod = align;
2467 if ((args.mod = (xfs_extlen_t)do_mod(ap->offset, args.prod)))
2468 args.mod = (xfs_extlen_t)(args.prod - args.mod);
2469 } else if (mp->m_sb.sb_blocksize >= PAGE_CACHE_SIZE) {
2470 args.prod = 1;
2471 args.mod = 0;
2472 } else {
2473 args.prod = PAGE_CACHE_SIZE >> mp->m_sb.sb_blocklog;
2474 if ((args.mod = (xfs_extlen_t)(do_mod(ap->offset, args.prod))))
2475 args.mod = (xfs_extlen_t)(args.prod - args.mod);
2476 }
2477 /*
2478 * If we are not low on available data blocks, and the
2479 * underlying logical volume manager is a stripe, and
2480 * the file offset is zero then try to allocate data
2481 * blocks on stripe unit boundary.
2482 * NOTE: ap->aeof is only set if the allocation length
2483 * is >= the stripe unit and the allocation offset is
2484 * at the end of file.
2485 */
2486 if (!ap->flist->xbf_low && ap->aeof) {
2487 if (!ap->offset) {
2488 args.alignment = mp->m_dalign;
2489 atype = args.type;
2490 isaligned = 1;
2491 /*
2492 * Adjust for alignment
2493 */
2494 if (blen > args.alignment && blen <= args.maxlen)
2495 args.minlen = blen - args.alignment;
2496 args.minalignslop = 0;
2497 } else {
2498 /*
2499 * First try an exact bno allocation.
2500 * If it fails then do a near or start bno
2501 * allocation with alignment turned on.
2502 */
2503 atype = args.type;
2504 tryagain = 1;
2505 args.type = XFS_ALLOCTYPE_THIS_BNO;
2506 args.alignment = 1;
2507 /*
2508 * Compute the minlen+alignment for the
2509 * next case. Set slop so that the value
2510 * of minlen+alignment+slop doesn't go up
2511 * between the calls.
2512 */
2513 if (blen > mp->m_dalign && blen <= args.maxlen)
2514 nextminlen = blen - mp->m_dalign;
2515 else
2516 nextminlen = args.minlen;
2517 if (nextminlen + mp->m_dalign > args.minlen + 1)
2518 args.minalignslop =
2519 nextminlen + mp->m_dalign -
2520 args.minlen - 1;
2521 else
2522 args.minalignslop = 0;
2523 }
2524 } else {
2525 args.alignment = 1;
2526 args.minalignslop = 0;
2527 }
2528 args.minleft = ap->minleft;
2529 args.wasdel = ap->wasdel;
2530 args.isfl = 0;
2531 args.userdata = ap->userdata;
2532 if ((error = xfs_alloc_vextent(&args)))
2533 return error;
2534 if (tryagain && args.fsbno == NULLFSBLOCK) {
2535 /*
2536 * Exact allocation failed. Now try with alignment
2537 * turned on.
2538 */
2539 args.type = atype;
2540 args.fsbno = ap->blkno;
2541 args.alignment = mp->m_dalign;
2542 args.minlen = nextminlen;
2543 args.minalignslop = 0;
2544 isaligned = 1;
2545 if ((error = xfs_alloc_vextent(&args)))
2546 return error;
2547 }
2548 if (isaligned && args.fsbno == NULLFSBLOCK) {
2549 /*
2550 * allocation failed, so turn off alignment and
2551 * try again.
2552 */
2553 args.type = atype;
2554 args.fsbno = ap->blkno;
2555 args.alignment = 0;
2556 if ((error = xfs_alloc_vextent(&args)))
2557 return error;
2558 }
2559 if (args.fsbno == NULLFSBLOCK && nullfb &&
2560 args.minlen > ap->minlen) {
2561 args.minlen = ap->minlen;
2562 args.type = XFS_ALLOCTYPE_START_BNO;
2563 args.fsbno = ap->blkno;
2564 if ((error = xfs_alloc_vextent(&args)))
2565 return error;
2566 }
2567 if (args.fsbno == NULLFSBLOCK && nullfb) {
2568 args.fsbno = 0;
2569 args.type = XFS_ALLOCTYPE_FIRST_AG;
2570 args.total = ap->minlen;
2571 args.minleft = 0;
2572 if ((error = xfs_alloc_vextent(&args)))
2573 return error;
2574 ap->flist->xbf_low = 1;
2575 }
2576 if (args.fsbno != NULLFSBLOCK) {
2577 /*
2578 * check the allocation happened at the same or higher AG than
2579 * the first block that was allocated.
2580 */
2581 ASSERT(*ap->firstblock == NULLFSBLOCK ||
2582 XFS_FSB_TO_AGNO(mp, *ap->firstblock) ==
2583 XFS_FSB_TO_AGNO(mp, args.fsbno) ||
2584 (ap->flist->xbf_low &&
2585 XFS_FSB_TO_AGNO(mp, *ap->firstblock) <
2586 XFS_FSB_TO_AGNO(mp, args.fsbno)));
2587
2588 ap->blkno = args.fsbno;
2589 if (*ap->firstblock == NULLFSBLOCK)
2590 *ap->firstblock = args.fsbno;
2591 ASSERT(nullfb || fb_agno == args.agno ||
2592 (ap->flist->xbf_low && fb_agno < args.agno));
2593 ap->length = args.len;
2594 ap->ip->i_d.di_nblocks += args.len;
2595 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
2596 if (ap->wasdel)
2597 ap->ip->i_delayed_blks -= args.len;
2598 /*
2599 * Adjust the disk quota also. This was reserved
2600 * earlier.
2601 */
2602 xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
2603 ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT :
2604 XFS_TRANS_DQ_BCOUNT,
2605 (long) args.len);
2606 } else {
2607 ap->blkno = NULLFSBLOCK;
2608 ap->length = 0;
2609 }
2610 return 0;
2611 }
2612
2613 /*
2614 * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
2615 * It figures out where to ask the underlying allocator to put the new extent.
2616 */
2617 STATIC int
xfs_bmap_alloc(xfs_bmalloca_t * ap)2618 xfs_bmap_alloc(
2619 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2620 {
2621 if (XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata)
2622 return xfs_bmap_rtalloc(ap);
2623 return xfs_bmap_btalloc(ap);
2624 }
2625
2626 /*
2627 * Transform a btree format file with only one leaf node, where the
2628 * extents list will fit in the inode, into an extents format file.
2629 * Since the file extents are already in-core, all we have to do is
2630 * give up the space for the btree root and pitch the leaf block.
2631 */
2632 STATIC int /* error */
xfs_bmap_btree_to_extents(xfs_trans_t * tp,xfs_inode_t * ip,xfs_btree_cur_t * cur,int * logflagsp,int whichfork)2633 xfs_bmap_btree_to_extents(
2634 xfs_trans_t *tp, /* transaction pointer */
2635 xfs_inode_t *ip, /* incore inode pointer */
2636 xfs_btree_cur_t *cur, /* btree cursor */
2637 int *logflagsp, /* inode logging flags */
2638 int whichfork) /* data or attr fork */
2639 {
2640 /* REFERENCED */
2641 struct xfs_btree_block *cblock;/* child btree block */
2642 xfs_fsblock_t cbno; /* child block number */
2643 xfs_buf_t *cbp; /* child block's buffer */
2644 int error; /* error return value */
2645 xfs_ifork_t *ifp; /* inode fork data */
2646 xfs_mount_t *mp; /* mount point structure */
2647 __be64 *pp; /* ptr to block address */
2648 struct xfs_btree_block *rblock;/* root btree block */
2649
2650 mp = ip->i_mount;
2651 ifp = XFS_IFORK_PTR(ip, whichfork);
2652 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
2653 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
2654 rblock = ifp->if_broot;
2655 ASSERT(be16_to_cpu(rblock->bb_level) == 1);
2656 ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1);
2657 ASSERT(xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0) == 1);
2658 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, ifp->if_broot_bytes);
2659 cbno = be64_to_cpu(*pp);
2660 *logflagsp = 0;
2661 #ifdef DEBUG
2662 if ((error = xfs_btree_check_lptr(cur, cbno, 1)))
2663 return error;
2664 #endif
2665 if ((error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp,
2666 XFS_BMAP_BTREE_REF)))
2667 return error;
2668 cblock = XFS_BUF_TO_BLOCK(cbp);
2669 if ((error = xfs_btree_check_block(cur, cblock, 0, cbp)))
2670 return error;
2671 xfs_bmap_add_free(cbno, 1, cur->bc_private.b.flist, mp);
2672 ip->i_d.di_nblocks--;
2673 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
2674 xfs_trans_binval(tp, cbp);
2675 if (cur->bc_bufs[0] == cbp)
2676 cur->bc_bufs[0] = NULL;
2677 xfs_iroot_realloc(ip, -1, whichfork);
2678 ASSERT(ifp->if_broot == NULL);
2679 ASSERT((ifp->if_flags & XFS_IFBROOT) == 0);
2680 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
2681 *logflagsp = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
2682 return 0;
2683 }
2684
2685 /*
2686 * Called by xfs_bmapi to update file extent records and the btree
2687 * after removing space (or undoing a delayed allocation).
2688 */
2689 STATIC int /* error */
xfs_bmap_del_extent(xfs_inode_t * ip,xfs_trans_t * tp,xfs_extnum_t * idx,xfs_bmap_free_t * flist,xfs_btree_cur_t * cur,xfs_bmbt_irec_t * del,int * logflagsp,int whichfork)2690 xfs_bmap_del_extent(
2691 xfs_inode_t *ip, /* incore inode pointer */
2692 xfs_trans_t *tp, /* current transaction pointer */
2693 xfs_extnum_t *idx, /* extent number to update/delete */
2694 xfs_bmap_free_t *flist, /* list of extents to be freed */
2695 xfs_btree_cur_t *cur, /* if null, not a btree */
2696 xfs_bmbt_irec_t *del, /* data to remove from extents */
2697 int *logflagsp, /* inode logging flags */
2698 int whichfork) /* data or attr fork */
2699 {
2700 xfs_filblks_t da_new; /* new delay-alloc indirect blocks */
2701 xfs_filblks_t da_old; /* old delay-alloc indirect blocks */
2702 xfs_fsblock_t del_endblock=0; /* first block past del */
2703 xfs_fileoff_t del_endoff; /* first offset past del */
2704 int delay; /* current block is delayed allocated */
2705 int do_fx; /* free extent at end of routine */
2706 xfs_bmbt_rec_host_t *ep; /* current extent entry pointer */
2707 int error; /* error return value */
2708 int flags; /* inode logging flags */
2709 xfs_bmbt_irec_t got; /* current extent entry */
2710 xfs_fileoff_t got_endoff; /* first offset past got */
2711 int i; /* temp state */
2712 xfs_ifork_t *ifp; /* inode fork pointer */
2713 xfs_mount_t *mp; /* mount structure */
2714 xfs_filblks_t nblks; /* quota/sb block count */
2715 xfs_bmbt_irec_t new; /* new record to be inserted */
2716 /* REFERENCED */
2717 uint qfield; /* quota field to update */
2718 xfs_filblks_t temp; /* for indirect length calculations */
2719 xfs_filblks_t temp2; /* for indirect length calculations */
2720 int state = 0;
2721
2722 XFS_STATS_INC(xs_del_exlist);
2723
2724 if (whichfork == XFS_ATTR_FORK)
2725 state |= BMAP_ATTRFORK;
2726
2727 mp = ip->i_mount;
2728 ifp = XFS_IFORK_PTR(ip, whichfork);
2729 ASSERT((*idx >= 0) && (*idx < ifp->if_bytes /
2730 (uint)sizeof(xfs_bmbt_rec_t)));
2731 ASSERT(del->br_blockcount > 0);
2732 ep = xfs_iext_get_ext(ifp, *idx);
2733 xfs_bmbt_get_all(ep, &got);
2734 ASSERT(got.br_startoff <= del->br_startoff);
2735 del_endoff = del->br_startoff + del->br_blockcount;
2736 got_endoff = got.br_startoff + got.br_blockcount;
2737 ASSERT(got_endoff >= del_endoff);
2738 delay = isnullstartblock(got.br_startblock);
2739 ASSERT(isnullstartblock(del->br_startblock) == delay);
2740 flags = 0;
2741 qfield = 0;
2742 error = 0;
2743 /*
2744 * If deleting a real allocation, must free up the disk space.
2745 */
2746 if (!delay) {
2747 flags = XFS_ILOG_CORE;
2748 /*
2749 * Realtime allocation. Free it and record di_nblocks update.
2750 */
2751 if (whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip)) {
2752 xfs_fsblock_t bno;
2753 xfs_filblks_t len;
2754
2755 ASSERT(do_mod(del->br_blockcount,
2756 mp->m_sb.sb_rextsize) == 0);
2757 ASSERT(do_mod(del->br_startblock,
2758 mp->m_sb.sb_rextsize) == 0);
2759 bno = del->br_startblock;
2760 len = del->br_blockcount;
2761 do_div(bno, mp->m_sb.sb_rextsize);
2762 do_div(len, mp->m_sb.sb_rextsize);
2763 error = xfs_rtfree_extent(tp, bno, (xfs_extlen_t)len);
2764 if (error)
2765 goto done;
2766 do_fx = 0;
2767 nblks = len * mp->m_sb.sb_rextsize;
2768 qfield = XFS_TRANS_DQ_RTBCOUNT;
2769 }
2770 /*
2771 * Ordinary allocation.
2772 */
2773 else {
2774 do_fx = 1;
2775 nblks = del->br_blockcount;
2776 qfield = XFS_TRANS_DQ_BCOUNT;
2777 }
2778 /*
2779 * Set up del_endblock and cur for later.
2780 */
2781 del_endblock = del->br_startblock + del->br_blockcount;
2782 if (cur) {
2783 if ((error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
2784 got.br_startblock, got.br_blockcount,
2785 &i)))
2786 goto done;
2787 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2788 }
2789 da_old = da_new = 0;
2790 } else {
2791 da_old = startblockval(got.br_startblock);
2792 da_new = 0;
2793 nblks = 0;
2794 do_fx = 0;
2795 }
2796 /*
2797 * Set flag value to use in switch statement.
2798 * Left-contig is 2, right-contig is 1.
2799 */
2800 switch (((got.br_startoff == del->br_startoff) << 1) |
2801 (got_endoff == del_endoff)) {
2802 case 3:
2803 /*
2804 * Matches the whole extent. Delete the entry.
2805 */
2806 xfs_iext_remove(ip, *idx, 1,
2807 whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0);
2808 --*idx;
2809 if (delay)
2810 break;
2811
2812 XFS_IFORK_NEXT_SET(ip, whichfork,
2813 XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
2814 flags |= XFS_ILOG_CORE;
2815 if (!cur) {
2816 flags |= xfs_ilog_fext(whichfork);
2817 break;
2818 }
2819 if ((error = xfs_btree_delete(cur, &i)))
2820 goto done;
2821 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2822 break;
2823
2824 case 2:
2825 /*
2826 * Deleting the first part of the extent.
2827 */
2828 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2829 xfs_bmbt_set_startoff(ep, del_endoff);
2830 temp = got.br_blockcount - del->br_blockcount;
2831 xfs_bmbt_set_blockcount(ep, temp);
2832 if (delay) {
2833 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
2834 da_old);
2835 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
2836 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2837 da_new = temp;
2838 break;
2839 }
2840 xfs_bmbt_set_startblock(ep, del_endblock);
2841 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2842 if (!cur) {
2843 flags |= xfs_ilog_fext(whichfork);
2844 break;
2845 }
2846 if ((error = xfs_bmbt_update(cur, del_endoff, del_endblock,
2847 got.br_blockcount - del->br_blockcount,
2848 got.br_state)))
2849 goto done;
2850 break;
2851
2852 case 1:
2853 /*
2854 * Deleting the last part of the extent.
2855 */
2856 temp = got.br_blockcount - del->br_blockcount;
2857 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2858 xfs_bmbt_set_blockcount(ep, temp);
2859 if (delay) {
2860 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
2861 da_old);
2862 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
2863 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2864 da_new = temp;
2865 break;
2866 }
2867 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2868 if (!cur) {
2869 flags |= xfs_ilog_fext(whichfork);
2870 break;
2871 }
2872 if ((error = xfs_bmbt_update(cur, got.br_startoff,
2873 got.br_startblock,
2874 got.br_blockcount - del->br_blockcount,
2875 got.br_state)))
2876 goto done;
2877 break;
2878
2879 case 0:
2880 /*
2881 * Deleting the middle of the extent.
2882 */
2883 temp = del->br_startoff - got.br_startoff;
2884 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2885 xfs_bmbt_set_blockcount(ep, temp);
2886 new.br_startoff = del_endoff;
2887 temp2 = got_endoff - del_endoff;
2888 new.br_blockcount = temp2;
2889 new.br_state = got.br_state;
2890 if (!delay) {
2891 new.br_startblock = del_endblock;
2892 flags |= XFS_ILOG_CORE;
2893 if (cur) {
2894 if ((error = xfs_bmbt_update(cur,
2895 got.br_startoff,
2896 got.br_startblock, temp,
2897 got.br_state)))
2898 goto done;
2899 if ((error = xfs_btree_increment(cur, 0, &i)))
2900 goto done;
2901 cur->bc_rec.b = new;
2902 error = xfs_btree_insert(cur, &i);
2903 if (error && error != ENOSPC)
2904 goto done;
2905 /*
2906 * If get no-space back from btree insert,
2907 * it tried a split, and we have a zero
2908 * block reservation.
2909 * Fix up our state and return the error.
2910 */
2911 if (error == ENOSPC) {
2912 /*
2913 * Reset the cursor, don't trust
2914 * it after any insert operation.
2915 */
2916 if ((error = xfs_bmbt_lookup_eq(cur,
2917 got.br_startoff,
2918 got.br_startblock,
2919 temp, &i)))
2920 goto done;
2921 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2922 /*
2923 * Update the btree record back
2924 * to the original value.
2925 */
2926 if ((error = xfs_bmbt_update(cur,
2927 got.br_startoff,
2928 got.br_startblock,
2929 got.br_blockcount,
2930 got.br_state)))
2931 goto done;
2932 /*
2933 * Reset the extent record back
2934 * to the original value.
2935 */
2936 xfs_bmbt_set_blockcount(ep,
2937 got.br_blockcount);
2938 flags = 0;
2939 error = XFS_ERROR(ENOSPC);
2940 goto done;
2941 }
2942 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2943 } else
2944 flags |= xfs_ilog_fext(whichfork);
2945 XFS_IFORK_NEXT_SET(ip, whichfork,
2946 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
2947 } else {
2948 ASSERT(whichfork == XFS_DATA_FORK);
2949 temp = xfs_bmap_worst_indlen(ip, temp);
2950 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
2951 temp2 = xfs_bmap_worst_indlen(ip, temp2);
2952 new.br_startblock = nullstartblock((int)temp2);
2953 da_new = temp + temp2;
2954 while (da_new > da_old) {
2955 if (temp) {
2956 temp--;
2957 da_new--;
2958 xfs_bmbt_set_startblock(ep,
2959 nullstartblock((int)temp));
2960 }
2961 if (da_new == da_old)
2962 break;
2963 if (temp2) {
2964 temp2--;
2965 da_new--;
2966 new.br_startblock =
2967 nullstartblock((int)temp2);
2968 }
2969 }
2970 }
2971 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2972 xfs_iext_insert(ip, *idx + 1, 1, &new, state);
2973 ++*idx;
2974 break;
2975 }
2976 /*
2977 * If we need to, add to list of extents to delete.
2978 */
2979 if (do_fx)
2980 xfs_bmap_add_free(del->br_startblock, del->br_blockcount, flist,
2981 mp);
2982 /*
2983 * Adjust inode # blocks in the file.
2984 */
2985 if (nblks)
2986 ip->i_d.di_nblocks -= nblks;
2987 /*
2988 * Adjust quota data.
2989 */
2990 if (qfield)
2991 xfs_trans_mod_dquot_byino(tp, ip, qfield, (long)-nblks);
2992
2993 /*
2994 * Account for change in delayed indirect blocks.
2995 * Nothing to do for disk quota accounting here.
2996 */
2997 ASSERT(da_old >= da_new);
2998 if (da_old > da_new) {
2999 xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
3000 (int64_t)(da_old - da_new), 0);
3001 }
3002 done:
3003 *logflagsp = flags;
3004 return error;
3005 }
3006
3007 /*
3008 * Remove the entry "free" from the free item list. Prev points to the
3009 * previous entry, unless "free" is the head of the list.
3010 */
3011 STATIC void
xfs_bmap_del_free(xfs_bmap_free_t * flist,xfs_bmap_free_item_t * prev,xfs_bmap_free_item_t * free)3012 xfs_bmap_del_free(
3013 xfs_bmap_free_t *flist, /* free item list header */
3014 xfs_bmap_free_item_t *prev, /* previous item on list, if any */
3015 xfs_bmap_free_item_t *free) /* list item to be freed */
3016 {
3017 if (prev)
3018 prev->xbfi_next = free->xbfi_next;
3019 else
3020 flist->xbf_first = free->xbfi_next;
3021 flist->xbf_count--;
3022 kmem_zone_free(xfs_bmap_free_item_zone, free);
3023 }
3024
3025 /*
3026 * Convert an extents-format file into a btree-format file.
3027 * The new file will have a root block (in the inode) and a single child block.
3028 */
3029 STATIC int /* error */
xfs_bmap_extents_to_btree(xfs_trans_t * tp,xfs_inode_t * ip,xfs_fsblock_t * firstblock,xfs_bmap_free_t * flist,xfs_btree_cur_t ** curp,int wasdel,int * logflagsp,int whichfork)3030 xfs_bmap_extents_to_btree(
3031 xfs_trans_t *tp, /* transaction pointer */
3032 xfs_inode_t *ip, /* incore inode pointer */
3033 xfs_fsblock_t *firstblock, /* first-block-allocated */
3034 xfs_bmap_free_t *flist, /* blocks freed in xaction */
3035 xfs_btree_cur_t **curp, /* cursor returned to caller */
3036 int wasdel, /* converting a delayed alloc */
3037 int *logflagsp, /* inode logging flags */
3038 int whichfork) /* data or attr fork */
3039 {
3040 struct xfs_btree_block *ablock; /* allocated (child) bt block */
3041 xfs_buf_t *abp; /* buffer for ablock */
3042 xfs_alloc_arg_t args; /* allocation arguments */
3043 xfs_bmbt_rec_t *arp; /* child record pointer */
3044 struct xfs_btree_block *block; /* btree root block */
3045 xfs_btree_cur_t *cur; /* bmap btree cursor */
3046 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
3047 int error; /* error return value */
3048 xfs_extnum_t i, cnt; /* extent record index */
3049 xfs_ifork_t *ifp; /* inode fork pointer */
3050 xfs_bmbt_key_t *kp; /* root block key pointer */
3051 xfs_mount_t *mp; /* mount structure */
3052 xfs_extnum_t nextents; /* number of file extents */
3053 xfs_bmbt_ptr_t *pp; /* root block address pointer */
3054
3055 ifp = XFS_IFORK_PTR(ip, whichfork);
3056 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS);
3057
3058 /*
3059 * Make space in the inode incore.
3060 */
3061 xfs_iroot_realloc(ip, 1, whichfork);
3062 ifp->if_flags |= XFS_IFBROOT;
3063
3064 /*
3065 * Fill in the root.
3066 */
3067 block = ifp->if_broot;
3068 block->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
3069 block->bb_level = cpu_to_be16(1);
3070 block->bb_numrecs = cpu_to_be16(1);
3071 block->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
3072 block->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);
3073
3074 /*
3075 * Need a cursor. Can't allocate until bb_level is filled in.
3076 */
3077 mp = ip->i_mount;
3078 cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
3079 cur->bc_private.b.firstblock = *firstblock;
3080 cur->bc_private.b.flist = flist;
3081 cur->bc_private.b.flags = wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
3082 /*
3083 * Convert to a btree with two levels, one record in root.
3084 */
3085 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_BTREE);
3086 args.tp = tp;
3087 args.mp = mp;
3088 args.firstblock = *firstblock;
3089 if (*firstblock == NULLFSBLOCK) {
3090 args.type = XFS_ALLOCTYPE_START_BNO;
3091 args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino);
3092 } else if (flist->xbf_low) {
3093 args.type = XFS_ALLOCTYPE_START_BNO;
3094 args.fsbno = *firstblock;
3095 } else {
3096 args.type = XFS_ALLOCTYPE_NEAR_BNO;
3097 args.fsbno = *firstblock;
3098 }
3099 args.minlen = args.maxlen = args.prod = 1;
3100 args.total = args.minleft = args.alignment = args.mod = args.isfl =
3101 args.minalignslop = 0;
3102 args.wasdel = wasdel;
3103 *logflagsp = 0;
3104 if ((error = xfs_alloc_vextent(&args))) {
3105 xfs_iroot_realloc(ip, -1, whichfork);
3106 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
3107 return error;
3108 }
3109 /*
3110 * Allocation can't fail, the space was reserved.
3111 */
3112 ASSERT(args.fsbno != NULLFSBLOCK);
3113 ASSERT(*firstblock == NULLFSBLOCK ||
3114 args.agno == XFS_FSB_TO_AGNO(mp, *firstblock) ||
3115 (flist->xbf_low &&
3116 args.agno > XFS_FSB_TO_AGNO(mp, *firstblock)));
3117 *firstblock = cur->bc_private.b.firstblock = args.fsbno;
3118 cur->bc_private.b.allocated++;
3119 ip->i_d.di_nblocks++;
3120 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
3121 abp = xfs_btree_get_bufl(mp, tp, args.fsbno, 0);
3122 /*
3123 * Fill in the child block.
3124 */
3125 ablock = XFS_BUF_TO_BLOCK(abp);
3126 ablock->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
3127 ablock->bb_level = 0;
3128 ablock->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
3129 ablock->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);
3130 arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
3131 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
3132 for (cnt = i = 0; i < nextents; i++) {
3133 ep = xfs_iext_get_ext(ifp, i);
3134 if (!isnullstartblock(xfs_bmbt_get_startblock(ep))) {
3135 arp->l0 = cpu_to_be64(ep->l0);
3136 arp->l1 = cpu_to_be64(ep->l1);
3137 arp++; cnt++;
3138 }
3139 }
3140 ASSERT(cnt == XFS_IFORK_NEXTENTS(ip, whichfork));
3141 xfs_btree_set_numrecs(ablock, cnt);
3142
3143 /*
3144 * Fill in the root key and pointer.
3145 */
3146 kp = XFS_BMBT_KEY_ADDR(mp, block, 1);
3147 arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
3148 kp->br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(arp));
3149 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, xfs_bmbt_get_maxrecs(cur,
3150 be16_to_cpu(block->bb_level)));
3151 *pp = cpu_to_be64(args.fsbno);
3152
3153 /*
3154 * Do all this logging at the end so that
3155 * the root is at the right level.
3156 */
3157 xfs_btree_log_block(cur, abp, XFS_BB_ALL_BITS);
3158 xfs_btree_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs));
3159 ASSERT(*curp == NULL);
3160 *curp = cur;
3161 *logflagsp = XFS_ILOG_CORE | xfs_ilog_fbroot(whichfork);
3162 return 0;
3163 }
3164
3165 /*
3166 * Calculate the default attribute fork offset for newly created inodes.
3167 */
3168 uint
xfs_default_attroffset(struct xfs_inode * ip)3169 xfs_default_attroffset(
3170 struct xfs_inode *ip)
3171 {
3172 struct xfs_mount *mp = ip->i_mount;
3173 uint offset;
3174
3175 if (mp->m_sb.sb_inodesize == 256) {
3176 offset = XFS_LITINO(mp) -
3177 XFS_BMDR_SPACE_CALC(MINABTPTRS);
3178 } else {
3179 offset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
3180 }
3181
3182 ASSERT(offset < XFS_LITINO(mp));
3183 return offset;
3184 }
3185
3186 /*
3187 * Helper routine to reset inode di_forkoff field when switching
3188 * attribute fork from local to extent format - we reset it where
3189 * possible to make space available for inline data fork extents.
3190 */
3191 STATIC void
xfs_bmap_forkoff_reset(xfs_mount_t * mp,xfs_inode_t * ip,int whichfork)3192 xfs_bmap_forkoff_reset(
3193 xfs_mount_t *mp,
3194 xfs_inode_t *ip,
3195 int whichfork)
3196 {
3197 if (whichfork == XFS_ATTR_FORK &&
3198 ip->i_d.di_format != XFS_DINODE_FMT_DEV &&
3199 ip->i_d.di_format != XFS_DINODE_FMT_UUID &&
3200 ip->i_d.di_format != XFS_DINODE_FMT_BTREE) {
3201 uint dfl_forkoff = xfs_default_attroffset(ip) >> 3;
3202
3203 if (dfl_forkoff > ip->i_d.di_forkoff)
3204 ip->i_d.di_forkoff = dfl_forkoff;
3205 }
3206 }
3207
3208 /*
3209 * Convert a local file to an extents file.
3210 * This code is out of bounds for data forks of regular files,
3211 * since the file data needs to get logged so things will stay consistent.
3212 * (The bmap-level manipulations are ok, though).
3213 */
3214 STATIC int /* error */
xfs_bmap_local_to_extents(xfs_trans_t * tp,xfs_inode_t * ip,xfs_fsblock_t * firstblock,xfs_extlen_t total,int * logflagsp,int whichfork)3215 xfs_bmap_local_to_extents(
3216 xfs_trans_t *tp, /* transaction pointer */
3217 xfs_inode_t *ip, /* incore inode pointer */
3218 xfs_fsblock_t *firstblock, /* first block allocated in xaction */
3219 xfs_extlen_t total, /* total blocks needed by transaction */
3220 int *logflagsp, /* inode logging flags */
3221 int whichfork) /* data or attr fork */
3222 {
3223 int error; /* error return value */
3224 int flags; /* logging flags returned */
3225 xfs_ifork_t *ifp; /* inode fork pointer */
3226
3227 /*
3228 * We don't want to deal with the case of keeping inode data inline yet.
3229 * So sending the data fork of a regular inode is invalid.
3230 */
3231 ASSERT(!(S_ISREG(ip->i_d.di_mode) && whichfork == XFS_DATA_FORK));
3232 ifp = XFS_IFORK_PTR(ip, whichfork);
3233 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
3234 flags = 0;
3235 error = 0;
3236 if (ifp->if_bytes) {
3237 xfs_alloc_arg_t args; /* allocation arguments */
3238 xfs_buf_t *bp; /* buffer for extent block */
3239 xfs_bmbt_rec_host_t *ep;/* extent record pointer */
3240
3241 args.tp = tp;
3242 args.mp = ip->i_mount;
3243 args.firstblock = *firstblock;
3244 ASSERT((ifp->if_flags &
3245 (XFS_IFINLINE|XFS_IFEXTENTS|XFS_IFEXTIREC)) == XFS_IFINLINE);
3246 /*
3247 * Allocate a block. We know we need only one, since the
3248 * file currently fits in an inode.
3249 */
3250 if (*firstblock == NULLFSBLOCK) {
3251 args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino);
3252 args.type = XFS_ALLOCTYPE_START_BNO;
3253 } else {
3254 args.fsbno = *firstblock;
3255 args.type = XFS_ALLOCTYPE_NEAR_BNO;
3256 }
3257 args.total = total;
3258 args.mod = args.minleft = args.alignment = args.wasdel =
3259 args.isfl = args.minalignslop = 0;
3260 args.minlen = args.maxlen = args.prod = 1;
3261 if ((error = xfs_alloc_vextent(&args)))
3262 goto done;
3263 /*
3264 * Can't fail, the space was reserved.
3265 */
3266 ASSERT(args.fsbno != NULLFSBLOCK);
3267 ASSERT(args.len == 1);
3268 *firstblock = args.fsbno;
3269 bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0);
3270 memcpy(bp->b_addr, ifp->if_u1.if_data, ifp->if_bytes);
3271 xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1);
3272 xfs_bmap_forkoff_reset(args.mp, ip, whichfork);
3273 xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
3274 xfs_iext_add(ifp, 0, 1);
3275 ep = xfs_iext_get_ext(ifp, 0);
3276 xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM);
3277 trace_xfs_bmap_post_update(ip, 0,
3278 whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0,
3279 _THIS_IP_);
3280 XFS_IFORK_NEXT_SET(ip, whichfork, 1);
3281 ip->i_d.di_nblocks = 1;
3282 xfs_trans_mod_dquot_byino(tp, ip,
3283 XFS_TRANS_DQ_BCOUNT, 1L);
3284 flags |= xfs_ilog_fext(whichfork);
3285 } else {
3286 ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0);
3287 xfs_bmap_forkoff_reset(ip->i_mount, ip, whichfork);
3288 }
3289 ifp->if_flags &= ~XFS_IFINLINE;
3290 ifp->if_flags |= XFS_IFEXTENTS;
3291 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
3292 flags |= XFS_ILOG_CORE;
3293 done:
3294 *logflagsp = flags;
3295 return error;
3296 }
3297
3298 /*
3299 * Search the extent records for the entry containing block bno.
3300 * If bno lies in a hole, point to the next entry. If bno lies
3301 * past eof, *eofp will be set, and *prevp will contain the last
3302 * entry (null if none). Else, *lastxp will be set to the index
3303 * of the found entry; *gotp will contain the entry.
3304 */
3305 STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
xfs_bmap_search_multi_extents(xfs_ifork_t * ifp,xfs_fileoff_t bno,int * eofp,xfs_extnum_t * lastxp,xfs_bmbt_irec_t * gotp,xfs_bmbt_irec_t * prevp)3306 xfs_bmap_search_multi_extents(
3307 xfs_ifork_t *ifp, /* inode fork pointer */
3308 xfs_fileoff_t bno, /* block number searched for */
3309 int *eofp, /* out: end of file found */
3310 xfs_extnum_t *lastxp, /* out: last extent index */
3311 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
3312 xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
3313 {
3314 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
3315 xfs_extnum_t lastx; /* last extent index */
3316
3317 /*
3318 * Initialize the extent entry structure to catch access to
3319 * uninitialized br_startblock field.
3320 */
3321 gotp->br_startoff = 0xffa5a5a5a5a5a5a5LL;
3322 gotp->br_blockcount = 0xa55a5a5a5a5a5a5aLL;
3323 gotp->br_state = XFS_EXT_INVALID;
3324 #if XFS_BIG_BLKNOS
3325 gotp->br_startblock = 0xffffa5a5a5a5a5a5LL;
3326 #else
3327 gotp->br_startblock = 0xffffa5a5;
3328 #endif
3329 prevp->br_startoff = NULLFILEOFF;
3330
3331 ep = xfs_iext_bno_to_ext(ifp, bno, &lastx);
3332 if (lastx > 0) {
3333 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx - 1), prevp);
3334 }
3335 if (lastx < (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
3336 xfs_bmbt_get_all(ep, gotp);
3337 *eofp = 0;
3338 } else {
3339 if (lastx > 0) {
3340 *gotp = *prevp;
3341 }
3342 *eofp = 1;
3343 ep = NULL;
3344 }
3345 *lastxp = lastx;
3346 return ep;
3347 }
3348
3349 /*
3350 * Search the extents list for the inode, for the extent containing bno.
3351 * If bno lies in a hole, point to the next entry. If bno lies past eof,
3352 * *eofp will be set, and *prevp will contain the last entry (null if none).
3353 * Else, *lastxp will be set to the index of the found
3354 * entry; *gotp will contain the entry.
3355 */
3356 STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
xfs_bmap_search_extents(xfs_inode_t * ip,xfs_fileoff_t bno,int fork,int * eofp,xfs_extnum_t * lastxp,xfs_bmbt_irec_t * gotp,xfs_bmbt_irec_t * prevp)3357 xfs_bmap_search_extents(
3358 xfs_inode_t *ip, /* incore inode pointer */
3359 xfs_fileoff_t bno, /* block number searched for */
3360 int fork, /* data or attr fork */
3361 int *eofp, /* out: end of file found */
3362 xfs_extnum_t *lastxp, /* out: last extent index */
3363 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
3364 xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
3365 {
3366 xfs_ifork_t *ifp; /* inode fork pointer */
3367 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
3368
3369 XFS_STATS_INC(xs_look_exlist);
3370 ifp = XFS_IFORK_PTR(ip, fork);
3371
3372 ep = xfs_bmap_search_multi_extents(ifp, bno, eofp, lastxp, gotp, prevp);
3373
3374 if (unlikely(!(gotp->br_startblock) && (*lastxp != NULLEXTNUM) &&
3375 !(XFS_IS_REALTIME_INODE(ip) && fork == XFS_DATA_FORK))) {
3376 xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO,
3377 "Access to block zero in inode %llu "
3378 "start_block: %llx start_off: %llx "
3379 "blkcnt: %llx extent-state: %x lastx: %x\n",
3380 (unsigned long long)ip->i_ino,
3381 (unsigned long long)gotp->br_startblock,
3382 (unsigned long long)gotp->br_startoff,
3383 (unsigned long long)gotp->br_blockcount,
3384 gotp->br_state, *lastxp);
3385 *lastxp = NULLEXTNUM;
3386 *eofp = 1;
3387 return NULL;
3388 }
3389 return ep;
3390 }
3391
3392 /*
3393 * Compute the worst-case number of indirect blocks that will be used
3394 * for ip's delayed extent of length "len".
3395 */
3396 STATIC xfs_filblks_t
xfs_bmap_worst_indlen(xfs_inode_t * ip,xfs_filblks_t len)3397 xfs_bmap_worst_indlen(
3398 xfs_inode_t *ip, /* incore inode pointer */
3399 xfs_filblks_t len) /* delayed extent length */
3400 {
3401 int level; /* btree level number */
3402 int maxrecs; /* maximum record count at this level */
3403 xfs_mount_t *mp; /* mount structure */
3404 xfs_filblks_t rval; /* return value */
3405
3406 mp = ip->i_mount;
3407 maxrecs = mp->m_bmap_dmxr[0];
3408 for (level = 0, rval = 0;
3409 level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK);
3410 level++) {
3411 len += maxrecs - 1;
3412 do_div(len, maxrecs);
3413 rval += len;
3414 if (len == 1)
3415 return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) -
3416 level - 1;
3417 if (level == 0)
3418 maxrecs = mp->m_bmap_dmxr[1];
3419 }
3420 return rval;
3421 }
3422
3423 /*
3424 * Convert inode from non-attributed to attributed.
3425 * Must not be in a transaction, ip must not be locked.
3426 */
3427 int /* error code */
xfs_bmap_add_attrfork(xfs_inode_t * ip,int size,int rsvd)3428 xfs_bmap_add_attrfork(
3429 xfs_inode_t *ip, /* incore inode pointer */
3430 int size, /* space new attribute needs */
3431 int rsvd) /* xact may use reserved blks */
3432 {
3433 xfs_fsblock_t firstblock; /* 1st block/ag allocated */
3434 xfs_bmap_free_t flist; /* freed extent records */
3435 xfs_mount_t *mp; /* mount structure */
3436 xfs_trans_t *tp; /* transaction pointer */
3437 int blks; /* space reservation */
3438 int version = 1; /* superblock attr version */
3439 int committed; /* xaction was committed */
3440 int logflags; /* logging flags */
3441 int error; /* error return value */
3442
3443 ASSERT(XFS_IFORK_Q(ip) == 0);
3444
3445 mp = ip->i_mount;
3446 ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
3447 tp = xfs_trans_alloc(mp, XFS_TRANS_ADDAFORK);
3448 blks = XFS_ADDAFORK_SPACE_RES(mp);
3449 if (rsvd)
3450 tp->t_flags |= XFS_TRANS_RESERVE;
3451 if ((error = xfs_trans_reserve(tp, blks, XFS_ADDAFORK_LOG_RES(mp), 0,
3452 XFS_TRANS_PERM_LOG_RES, XFS_ADDAFORK_LOG_COUNT)))
3453 goto error0;
3454 xfs_ilock(ip, XFS_ILOCK_EXCL);
3455 error = xfs_trans_reserve_quota_nblks(tp, ip, blks, 0, rsvd ?
3456 XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
3457 XFS_QMOPT_RES_REGBLKS);
3458 if (error) {
3459 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3460 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES);
3461 return error;
3462 }
3463 if (XFS_IFORK_Q(ip))
3464 goto error1;
3465 if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS) {
3466 /*
3467 * For inodes coming from pre-6.2 filesystems.
3468 */
3469 ASSERT(ip->i_d.di_aformat == 0);
3470 ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
3471 }
3472 ASSERT(ip->i_d.di_anextents == 0);
3473
3474 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
3475 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
3476
3477 switch (ip->i_d.di_format) {
3478 case XFS_DINODE_FMT_DEV:
3479 ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
3480 break;
3481 case XFS_DINODE_FMT_UUID:
3482 ip->i_d.di_forkoff = roundup(sizeof(uuid_t), 8) >> 3;
3483 break;
3484 case XFS_DINODE_FMT_LOCAL:
3485 case XFS_DINODE_FMT_EXTENTS:
3486 case XFS_DINODE_FMT_BTREE:
3487 ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size);
3488 if (!ip->i_d.di_forkoff)
3489 ip->i_d.di_forkoff = xfs_default_attroffset(ip) >> 3;
3490 else if (mp->m_flags & XFS_MOUNT_ATTR2)
3491 version = 2;
3492 break;
3493 default:
3494 ASSERT(0);
3495 error = XFS_ERROR(EINVAL);
3496 goto error1;
3497 }
3498
3499 ASSERT(ip->i_afp == NULL);
3500 ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
3501 ip->i_afp->if_flags = XFS_IFEXTENTS;
3502 logflags = 0;
3503 xfs_bmap_init(&flist, &firstblock);
3504 switch (ip->i_d.di_format) {
3505 case XFS_DINODE_FMT_LOCAL:
3506 error = xfs_bmap_add_attrfork_local(tp, ip, &firstblock, &flist,
3507 &logflags);
3508 break;
3509 case XFS_DINODE_FMT_EXTENTS:
3510 error = xfs_bmap_add_attrfork_extents(tp, ip, &firstblock,
3511 &flist, &logflags);
3512 break;
3513 case XFS_DINODE_FMT_BTREE:
3514 error = xfs_bmap_add_attrfork_btree(tp, ip, &firstblock, &flist,
3515 &logflags);
3516 break;
3517 default:
3518 error = 0;
3519 break;
3520 }
3521 if (logflags)
3522 xfs_trans_log_inode(tp, ip, logflags);
3523 if (error)
3524 goto error2;
3525 if (!xfs_sb_version_hasattr(&mp->m_sb) ||
3526 (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2)) {
3527 __int64_t sbfields = 0;
3528
3529 spin_lock(&mp->m_sb_lock);
3530 if (!xfs_sb_version_hasattr(&mp->m_sb)) {
3531 xfs_sb_version_addattr(&mp->m_sb);
3532 sbfields |= XFS_SB_VERSIONNUM;
3533 }
3534 if (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2) {
3535 xfs_sb_version_addattr2(&mp->m_sb);
3536 sbfields |= (XFS_SB_VERSIONNUM | XFS_SB_FEATURES2);
3537 }
3538 if (sbfields) {
3539 spin_unlock(&mp->m_sb_lock);
3540 xfs_mod_sb(tp, sbfields);
3541 } else
3542 spin_unlock(&mp->m_sb_lock);
3543 }
3544
3545 error = xfs_bmap_finish(&tp, &flist, &committed);
3546 if (error)
3547 goto error2;
3548 return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
3549 error2:
3550 xfs_bmap_cancel(&flist);
3551 error1:
3552 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3553 error0:
3554 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
3555 return error;
3556 }
3557
3558 /*
3559 * Add the extent to the list of extents to be free at transaction end.
3560 * The list is maintained sorted (by block number).
3561 */
3562 /* ARGSUSED */
3563 void
xfs_bmap_add_free(xfs_fsblock_t bno,xfs_filblks_t len,xfs_bmap_free_t * flist,xfs_mount_t * mp)3564 xfs_bmap_add_free(
3565 xfs_fsblock_t bno, /* fs block number of extent */
3566 xfs_filblks_t len, /* length of extent */
3567 xfs_bmap_free_t *flist, /* list of extents */
3568 xfs_mount_t *mp) /* mount point structure */
3569 {
3570 xfs_bmap_free_item_t *cur; /* current (next) element */
3571 xfs_bmap_free_item_t *new; /* new element */
3572 xfs_bmap_free_item_t *prev; /* previous element */
3573 #ifdef DEBUG
3574 xfs_agnumber_t agno;
3575 xfs_agblock_t agbno;
3576
3577 ASSERT(bno != NULLFSBLOCK);
3578 ASSERT(len > 0);
3579 ASSERT(len <= MAXEXTLEN);
3580 ASSERT(!isnullstartblock(bno));
3581 agno = XFS_FSB_TO_AGNO(mp, bno);
3582 agbno = XFS_FSB_TO_AGBNO(mp, bno);
3583 ASSERT(agno < mp->m_sb.sb_agcount);
3584 ASSERT(agbno < mp->m_sb.sb_agblocks);
3585 ASSERT(len < mp->m_sb.sb_agblocks);
3586 ASSERT(agbno + len <= mp->m_sb.sb_agblocks);
3587 #endif
3588 ASSERT(xfs_bmap_free_item_zone != NULL);
3589 new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
3590 new->xbfi_startblock = bno;
3591 new->xbfi_blockcount = (xfs_extlen_t)len;
3592 for (prev = NULL, cur = flist->xbf_first;
3593 cur != NULL;
3594 prev = cur, cur = cur->xbfi_next) {
3595 if (cur->xbfi_startblock >= bno)
3596 break;
3597 }
3598 if (prev)
3599 prev->xbfi_next = new;
3600 else
3601 flist->xbf_first = new;
3602 new->xbfi_next = cur;
3603 flist->xbf_count++;
3604 }
3605
3606 /*
3607 * Compute and fill in the value of the maximum depth of a bmap btree
3608 * in this filesystem. Done once, during mount.
3609 */
3610 void
xfs_bmap_compute_maxlevels(xfs_mount_t * mp,int whichfork)3611 xfs_bmap_compute_maxlevels(
3612 xfs_mount_t *mp, /* file system mount structure */
3613 int whichfork) /* data or attr fork */
3614 {
3615 int level; /* btree level */
3616 uint maxblocks; /* max blocks at this level */
3617 uint maxleafents; /* max leaf entries possible */
3618 int maxrootrecs; /* max records in root block */
3619 int minleafrecs; /* min records in leaf block */
3620 int minnoderecs; /* min records in node block */
3621 int sz; /* root block size */
3622
3623 /*
3624 * The maximum number of extents in a file, hence the maximum
3625 * number of leaf entries, is controlled by the type of di_nextents
3626 * (a signed 32-bit number, xfs_extnum_t), or by di_anextents
3627 * (a signed 16-bit number, xfs_aextnum_t).
3628 *
3629 * Note that we can no longer assume that if we are in ATTR1 that
3630 * the fork offset of all the inodes will be
3631 * (xfs_default_attroffset(ip) >> 3) because we could have mounted
3632 * with ATTR2 and then mounted back with ATTR1, keeping the
3633 * di_forkoff's fixed but probably at various positions. Therefore,
3634 * for both ATTR1 and ATTR2 we have to assume the worst case scenario
3635 * of a minimum size available.
3636 */
3637 if (whichfork == XFS_DATA_FORK) {
3638 maxleafents = MAXEXTNUM;
3639 sz = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
3640 } else {
3641 maxleafents = MAXAEXTNUM;
3642 sz = XFS_BMDR_SPACE_CALC(MINABTPTRS);
3643 }
3644 maxrootrecs = xfs_bmdr_maxrecs(mp, sz, 0);
3645 minleafrecs = mp->m_bmap_dmnr[0];
3646 minnoderecs = mp->m_bmap_dmnr[1];
3647 maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
3648 for (level = 1; maxblocks > 1; level++) {
3649 if (maxblocks <= maxrootrecs)
3650 maxblocks = 1;
3651 else
3652 maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
3653 }
3654 mp->m_bm_maxlevels[whichfork] = level;
3655 }
3656
3657 /*
3658 * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
3659 * caller. Frees all the extents that need freeing, which must be done
3660 * last due to locking considerations. We never free any extents in
3661 * the first transaction.
3662 *
3663 * Return 1 if the given transaction was committed and a new one
3664 * started, and 0 otherwise in the committed parameter.
3665 */
3666 int /* error */
xfs_bmap_finish(xfs_trans_t ** tp,xfs_bmap_free_t * flist,int * committed)3667 xfs_bmap_finish(
3668 xfs_trans_t **tp, /* transaction pointer addr */
3669 xfs_bmap_free_t *flist, /* i/o: list extents to free */
3670 int *committed) /* xact committed or not */
3671 {
3672 xfs_efd_log_item_t *efd; /* extent free data */
3673 xfs_efi_log_item_t *efi; /* extent free intention */
3674 int error; /* error return value */
3675 xfs_bmap_free_item_t *free; /* free extent item */
3676 unsigned int logres; /* new log reservation */
3677 unsigned int logcount; /* new log count */
3678 xfs_mount_t *mp; /* filesystem mount structure */
3679 xfs_bmap_free_item_t *next; /* next item on free list */
3680 xfs_trans_t *ntp; /* new transaction pointer */
3681
3682 ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES);
3683 if (flist->xbf_count == 0) {
3684 *committed = 0;
3685 return 0;
3686 }
3687 ntp = *tp;
3688 efi = xfs_trans_get_efi(ntp, flist->xbf_count);
3689 for (free = flist->xbf_first; free; free = free->xbfi_next)
3690 xfs_trans_log_efi_extent(ntp, efi, free->xbfi_startblock,
3691 free->xbfi_blockcount);
3692 logres = ntp->t_log_res;
3693 logcount = ntp->t_log_count;
3694 ntp = xfs_trans_dup(*tp);
3695 error = xfs_trans_commit(*tp, 0);
3696 *tp = ntp;
3697 *committed = 1;
3698 /*
3699 * We have a new transaction, so we should return committed=1,
3700 * even though we're returning an error.
3701 */
3702 if (error)
3703 return error;
3704
3705 /*
3706 * transaction commit worked ok so we can drop the extra ticket
3707 * reference that we gained in xfs_trans_dup()
3708 */
3709 xfs_log_ticket_put(ntp->t_ticket);
3710
3711 if ((error = xfs_trans_reserve(ntp, 0, logres, 0, XFS_TRANS_PERM_LOG_RES,
3712 logcount)))
3713 return error;
3714 efd = xfs_trans_get_efd(ntp, efi, flist->xbf_count);
3715 for (free = flist->xbf_first; free != NULL; free = next) {
3716 next = free->xbfi_next;
3717 if ((error = xfs_free_extent(ntp, free->xbfi_startblock,
3718 free->xbfi_blockcount))) {
3719 /*
3720 * The bmap free list will be cleaned up at a
3721 * higher level. The EFI will be canceled when
3722 * this transaction is aborted.
3723 * Need to force shutdown here to make sure it
3724 * happens, since this transaction may not be
3725 * dirty yet.
3726 */
3727 mp = ntp->t_mountp;
3728 if (!XFS_FORCED_SHUTDOWN(mp))
3729 xfs_force_shutdown(mp,
3730 (error == EFSCORRUPTED) ?
3731 SHUTDOWN_CORRUPT_INCORE :
3732 SHUTDOWN_META_IO_ERROR);
3733 return error;
3734 }
3735 xfs_trans_log_efd_extent(ntp, efd, free->xbfi_startblock,
3736 free->xbfi_blockcount);
3737 xfs_bmap_del_free(flist, NULL, free);
3738 }
3739 return 0;
3740 }
3741
3742 /*
3743 * Free up any items left in the list.
3744 */
3745 void
xfs_bmap_cancel(xfs_bmap_free_t * flist)3746 xfs_bmap_cancel(
3747 xfs_bmap_free_t *flist) /* list of bmap_free_items */
3748 {
3749 xfs_bmap_free_item_t *free; /* free list item */
3750 xfs_bmap_free_item_t *next;
3751
3752 if (flist->xbf_count == 0)
3753 return;
3754 ASSERT(flist->xbf_first != NULL);
3755 for (free = flist->xbf_first; free; free = next) {
3756 next = free->xbfi_next;
3757 xfs_bmap_del_free(flist, NULL, free);
3758 }
3759 ASSERT(flist->xbf_count == 0);
3760 }
3761
3762 /*
3763 * Returns the file-relative block number of the first unused block(s)
3764 * in the file with at least "len" logically contiguous blocks free.
3765 * This is the lowest-address hole if the file has holes, else the first block
3766 * past the end of file.
3767 * Return 0 if the file is currently local (in-inode).
3768 */
3769 int /* error */
xfs_bmap_first_unused(xfs_trans_t * tp,xfs_inode_t * ip,xfs_extlen_t len,xfs_fileoff_t * first_unused,int whichfork)3770 xfs_bmap_first_unused(
3771 xfs_trans_t *tp, /* transaction pointer */
3772 xfs_inode_t *ip, /* incore inode */
3773 xfs_extlen_t len, /* size of hole to find */
3774 xfs_fileoff_t *first_unused, /* unused block */
3775 int whichfork) /* data or attr fork */
3776 {
3777 int error; /* error return value */
3778 int idx; /* extent record index */
3779 xfs_ifork_t *ifp; /* inode fork pointer */
3780 xfs_fileoff_t lastaddr; /* last block number seen */
3781 xfs_fileoff_t lowest; /* lowest useful block */
3782 xfs_fileoff_t max; /* starting useful block */
3783 xfs_fileoff_t off; /* offset for this block */
3784 xfs_extnum_t nextents; /* number of extent entries */
3785
3786 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE ||
3787 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ||
3788 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
3789 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
3790 *first_unused = 0;
3791 return 0;
3792 }
3793 ifp = XFS_IFORK_PTR(ip, whichfork);
3794 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
3795 (error = xfs_iread_extents(tp, ip, whichfork)))
3796 return error;
3797 lowest = *first_unused;
3798 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
3799 for (idx = 0, lastaddr = 0, max = lowest; idx < nextents; idx++) {
3800 xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
3801 off = xfs_bmbt_get_startoff(ep);
3802 /*
3803 * See if the hole before this extent will work.
3804 */
3805 if (off >= lowest + len && off - max >= len) {
3806 *first_unused = max;
3807 return 0;
3808 }
3809 lastaddr = off + xfs_bmbt_get_blockcount(ep);
3810 max = XFS_FILEOFF_MAX(lastaddr, lowest);
3811 }
3812 *first_unused = max;
3813 return 0;
3814 }
3815
3816 /*
3817 * Returns the file-relative block number of the last block + 1 before
3818 * last_block (input value) in the file.
3819 * This is not based on i_size, it is based on the extent records.
3820 * Returns 0 for local files, as they do not have extent records.
3821 */
3822 int /* error */
xfs_bmap_last_before(xfs_trans_t * tp,xfs_inode_t * ip,xfs_fileoff_t * last_block,int whichfork)3823 xfs_bmap_last_before(
3824 xfs_trans_t *tp, /* transaction pointer */
3825 xfs_inode_t *ip, /* incore inode */
3826 xfs_fileoff_t *last_block, /* last block */
3827 int whichfork) /* data or attr fork */
3828 {
3829 xfs_fileoff_t bno; /* input file offset */
3830 int eof; /* hit end of file */
3831 xfs_bmbt_rec_host_t *ep; /* pointer to last extent */
3832 int error; /* error return value */
3833 xfs_bmbt_irec_t got; /* current extent value */
3834 xfs_ifork_t *ifp; /* inode fork pointer */
3835 xfs_extnum_t lastx; /* last extent used */
3836 xfs_bmbt_irec_t prev; /* previous extent value */
3837
3838 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
3839 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
3840 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
3841 return XFS_ERROR(EIO);
3842 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
3843 *last_block = 0;
3844 return 0;
3845 }
3846 ifp = XFS_IFORK_PTR(ip, whichfork);
3847 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
3848 (error = xfs_iread_extents(tp, ip, whichfork)))
3849 return error;
3850 bno = *last_block - 1;
3851 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
3852 &prev);
3853 if (eof || xfs_bmbt_get_startoff(ep) > bno) {
3854 if (prev.br_startoff == NULLFILEOFF)
3855 *last_block = 0;
3856 else
3857 *last_block = prev.br_startoff + prev.br_blockcount;
3858 }
3859 /*
3860 * Otherwise *last_block is already the right answer.
3861 */
3862 return 0;
3863 }
3864
3865 STATIC int
xfs_bmap_last_extent(struct xfs_trans * tp,struct xfs_inode * ip,int whichfork,struct xfs_bmbt_irec * rec,int * is_empty)3866 xfs_bmap_last_extent(
3867 struct xfs_trans *tp,
3868 struct xfs_inode *ip,
3869 int whichfork,
3870 struct xfs_bmbt_irec *rec,
3871 int *is_empty)
3872 {
3873 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
3874 int error;
3875 int nextents;
3876
3877 if (!(ifp->if_flags & XFS_IFEXTENTS)) {
3878 error = xfs_iread_extents(tp, ip, whichfork);
3879 if (error)
3880 return error;
3881 }
3882
3883 nextents = ifp->if_bytes / sizeof(xfs_bmbt_rec_t);
3884 if (nextents == 0) {
3885 *is_empty = 1;
3886 return 0;
3887 }
3888
3889 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, nextents - 1), rec);
3890 *is_empty = 0;
3891 return 0;
3892 }
3893
3894 /*
3895 * Check the last inode extent to determine whether this allocation will result
3896 * in blocks being allocated at the end of the file. When we allocate new data
3897 * blocks at the end of the file which do not start at the previous data block,
3898 * we will try to align the new blocks at stripe unit boundaries.
3899 *
3900 * Returns 0 in bma->aeof if the file (fork) is empty as any new write will be
3901 * at, or past the EOF.
3902 */
3903 STATIC int
xfs_bmap_isaeof(struct xfs_bmalloca * bma,int whichfork)3904 xfs_bmap_isaeof(
3905 struct xfs_bmalloca *bma,
3906 int whichfork)
3907 {
3908 struct xfs_bmbt_irec rec;
3909 int is_empty;
3910 int error;
3911
3912 bma->aeof = 0;
3913 error = xfs_bmap_last_extent(NULL, bma->ip, whichfork, &rec,
3914 &is_empty);
3915 if (error || is_empty)
3916 return error;
3917
3918 /*
3919 * Check if we are allocation or past the last extent, or at least into
3920 * the last delayed allocated extent.
3921 */
3922 bma->aeof = bma->offset >= rec.br_startoff + rec.br_blockcount ||
3923 (bma->offset >= rec.br_startoff &&
3924 isnullstartblock(rec.br_startblock));
3925 return 0;
3926 }
3927
3928 /*
3929 * Check if the endoff is outside the last extent. If so the caller will grow
3930 * the allocation to a stripe unit boundary. All offsets are considered outside
3931 * the end of file for an empty fork, so 1 is returned in *eof in that case.
3932 */
3933 int
xfs_bmap_eof(struct xfs_inode * ip,xfs_fileoff_t endoff,int whichfork,int * eof)3934 xfs_bmap_eof(
3935 struct xfs_inode *ip,
3936 xfs_fileoff_t endoff,
3937 int whichfork,
3938 int *eof)
3939 {
3940 struct xfs_bmbt_irec rec;
3941 int error;
3942
3943 error = xfs_bmap_last_extent(NULL, ip, whichfork, &rec, eof);
3944 if (error || *eof)
3945 return error;
3946
3947 *eof = endoff >= rec.br_startoff + rec.br_blockcount;
3948 return 0;
3949 }
3950
3951 /*
3952 * Returns the file-relative block number of the first block past eof in
3953 * the file. This is not based on i_size, it is based on the extent records.
3954 * Returns 0 for local files, as they do not have extent records.
3955 */
3956 int
xfs_bmap_last_offset(struct xfs_trans * tp,struct xfs_inode * ip,xfs_fileoff_t * last_block,int whichfork)3957 xfs_bmap_last_offset(
3958 struct xfs_trans *tp,
3959 struct xfs_inode *ip,
3960 xfs_fileoff_t *last_block,
3961 int whichfork)
3962 {
3963 struct xfs_bmbt_irec rec;
3964 int is_empty;
3965 int error;
3966
3967 *last_block = 0;
3968
3969 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL)
3970 return 0;
3971
3972 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
3973 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
3974 return XFS_ERROR(EIO);
3975
3976 error = xfs_bmap_last_extent(NULL, ip, whichfork, &rec, &is_empty);
3977 if (error || is_empty)
3978 return error;
3979
3980 *last_block = rec.br_startoff + rec.br_blockcount;
3981 return 0;
3982 }
3983
3984 /*
3985 * Returns whether the selected fork of the inode has exactly one
3986 * block or not. For the data fork we check this matches di_size,
3987 * implying the file's range is 0..bsize-1.
3988 */
3989 int /* 1=>1 block, 0=>otherwise */
xfs_bmap_one_block(xfs_inode_t * ip,int whichfork)3990 xfs_bmap_one_block(
3991 xfs_inode_t *ip, /* incore inode */
3992 int whichfork) /* data or attr fork */
3993 {
3994 xfs_bmbt_rec_host_t *ep; /* ptr to fork's extent */
3995 xfs_ifork_t *ifp; /* inode fork pointer */
3996 int rval; /* return value */
3997 xfs_bmbt_irec_t s; /* internal version of extent */
3998
3999 #ifndef DEBUG
4000 if (whichfork == XFS_DATA_FORK)
4001 return XFS_ISIZE(ip) == ip->i_mount->m_sb.sb_blocksize;
4002 #endif /* !DEBUG */
4003 if (XFS_IFORK_NEXTENTS(ip, whichfork) != 1)
4004 return 0;
4005 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
4006 return 0;
4007 ifp = XFS_IFORK_PTR(ip, whichfork);
4008 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
4009 ep = xfs_iext_get_ext(ifp, 0);
4010 xfs_bmbt_get_all(ep, &s);
4011 rval = s.br_startoff == 0 && s.br_blockcount == 1;
4012 if (rval && whichfork == XFS_DATA_FORK)
4013 ASSERT(XFS_ISIZE(ip) == ip->i_mount->m_sb.sb_blocksize);
4014 return rval;
4015 }
4016
4017 STATIC int
xfs_bmap_sanity_check(struct xfs_mount * mp,struct xfs_buf * bp,int level)4018 xfs_bmap_sanity_check(
4019 struct xfs_mount *mp,
4020 struct xfs_buf *bp,
4021 int level)
4022 {
4023 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
4024
4025 if (block->bb_magic != cpu_to_be32(XFS_BMAP_MAGIC) ||
4026 be16_to_cpu(block->bb_level) != level ||
4027 be16_to_cpu(block->bb_numrecs) == 0 ||
4028 be16_to_cpu(block->bb_numrecs) > mp->m_bmap_dmxr[level != 0])
4029 return 0;
4030 return 1;
4031 }
4032
4033 /*
4034 * Read in the extents to if_extents.
4035 * All inode fields are set up by caller, we just traverse the btree
4036 * and copy the records in. If the file system cannot contain unwritten
4037 * extents, the records are checked for no "state" flags.
4038 */
4039 int /* error */
xfs_bmap_read_extents(xfs_trans_t * tp,xfs_inode_t * ip,int whichfork)4040 xfs_bmap_read_extents(
4041 xfs_trans_t *tp, /* transaction pointer */
4042 xfs_inode_t *ip, /* incore inode */
4043 int whichfork) /* data or attr fork */
4044 {
4045 struct xfs_btree_block *block; /* current btree block */
4046 xfs_fsblock_t bno; /* block # of "block" */
4047 xfs_buf_t *bp; /* buffer for "block" */
4048 int error; /* error return value */
4049 xfs_exntfmt_t exntf; /* XFS_EXTFMT_NOSTATE, if checking */
4050 xfs_extnum_t i, j; /* index into the extents list */
4051 xfs_ifork_t *ifp; /* fork structure */
4052 int level; /* btree level, for checking */
4053 xfs_mount_t *mp; /* file system mount structure */
4054 __be64 *pp; /* pointer to block address */
4055 /* REFERENCED */
4056 xfs_extnum_t room; /* number of entries there's room for */
4057
4058 bno = NULLFSBLOCK;
4059 mp = ip->i_mount;
4060 ifp = XFS_IFORK_PTR(ip, whichfork);
4061 exntf = (whichfork != XFS_DATA_FORK) ? XFS_EXTFMT_NOSTATE :
4062 XFS_EXTFMT_INODE(ip);
4063 block = ifp->if_broot;
4064 /*
4065 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
4066 */
4067 level = be16_to_cpu(block->bb_level);
4068 ASSERT(level > 0);
4069 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
4070 bno = be64_to_cpu(*pp);
4071 ASSERT(bno != NULLDFSBNO);
4072 ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
4073 ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
4074 /*
4075 * Go down the tree until leaf level is reached, following the first
4076 * pointer (leftmost) at each level.
4077 */
4078 while (level-- > 0) {
4079 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
4080 XFS_BMAP_BTREE_REF)))
4081 return error;
4082 block = XFS_BUF_TO_BLOCK(bp);
4083 XFS_WANT_CORRUPTED_GOTO(
4084 xfs_bmap_sanity_check(mp, bp, level),
4085 error0);
4086 if (level == 0)
4087 break;
4088 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
4089 bno = be64_to_cpu(*pp);
4090 XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, bno), error0);
4091 xfs_trans_brelse(tp, bp);
4092 }
4093 /*
4094 * Here with bp and block set to the leftmost leaf node in the tree.
4095 */
4096 room = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4097 i = 0;
4098 /*
4099 * Loop over all leaf nodes. Copy information to the extent records.
4100 */
4101 for (;;) {
4102 xfs_bmbt_rec_t *frp;
4103 xfs_fsblock_t nextbno;
4104 xfs_extnum_t num_recs;
4105 xfs_extnum_t start;
4106
4107 num_recs = xfs_btree_get_numrecs(block);
4108 if (unlikely(i + num_recs > room)) {
4109 ASSERT(i + num_recs <= room);
4110 xfs_warn(ip->i_mount,
4111 "corrupt dinode %Lu, (btree extents).",
4112 (unsigned long long) ip->i_ino);
4113 XFS_CORRUPTION_ERROR("xfs_bmap_read_extents(1)",
4114 XFS_ERRLEVEL_LOW, ip->i_mount, block);
4115 goto error0;
4116 }
4117 XFS_WANT_CORRUPTED_GOTO(
4118 xfs_bmap_sanity_check(mp, bp, 0),
4119 error0);
4120 /*
4121 * Read-ahead the next leaf block, if any.
4122 */
4123 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
4124 if (nextbno != NULLFSBLOCK)
4125 xfs_btree_reada_bufl(mp, nextbno, 1);
4126 /*
4127 * Copy records into the extent records.
4128 */
4129 frp = XFS_BMBT_REC_ADDR(mp, block, 1);
4130 start = i;
4131 for (j = 0; j < num_recs; j++, i++, frp++) {
4132 xfs_bmbt_rec_host_t *trp = xfs_iext_get_ext(ifp, i);
4133 trp->l0 = be64_to_cpu(frp->l0);
4134 trp->l1 = be64_to_cpu(frp->l1);
4135 }
4136 if (exntf == XFS_EXTFMT_NOSTATE) {
4137 /*
4138 * Check all attribute bmap btree records and
4139 * any "older" data bmap btree records for a
4140 * set bit in the "extent flag" position.
4141 */
4142 if (unlikely(xfs_check_nostate_extents(ifp,
4143 start, num_recs))) {
4144 XFS_ERROR_REPORT("xfs_bmap_read_extents(2)",
4145 XFS_ERRLEVEL_LOW,
4146 ip->i_mount);
4147 goto error0;
4148 }
4149 }
4150 xfs_trans_brelse(tp, bp);
4151 bno = nextbno;
4152 /*
4153 * If we've reached the end, stop.
4154 */
4155 if (bno == NULLFSBLOCK)
4156 break;
4157 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
4158 XFS_BMAP_BTREE_REF)))
4159 return error;
4160 block = XFS_BUF_TO_BLOCK(bp);
4161 }
4162 ASSERT(i == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
4163 ASSERT(i == XFS_IFORK_NEXTENTS(ip, whichfork));
4164 XFS_BMAP_TRACE_EXLIST(ip, i, whichfork);
4165 return 0;
4166 error0:
4167 xfs_trans_brelse(tp, bp);
4168 return XFS_ERROR(EFSCORRUPTED);
4169 }
4170
4171 #ifdef DEBUG
4172 /*
4173 * Add bmap trace insert entries for all the contents of the extent records.
4174 */
4175 void
xfs_bmap_trace_exlist(xfs_inode_t * ip,xfs_extnum_t cnt,int whichfork,unsigned long caller_ip)4176 xfs_bmap_trace_exlist(
4177 xfs_inode_t *ip, /* incore inode pointer */
4178 xfs_extnum_t cnt, /* count of entries in the list */
4179 int whichfork, /* data or attr fork */
4180 unsigned long caller_ip)
4181 {
4182 xfs_extnum_t idx; /* extent record index */
4183 xfs_ifork_t *ifp; /* inode fork pointer */
4184 int state = 0;
4185
4186 if (whichfork == XFS_ATTR_FORK)
4187 state |= BMAP_ATTRFORK;
4188
4189 ifp = XFS_IFORK_PTR(ip, whichfork);
4190 ASSERT(cnt == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
4191 for (idx = 0; idx < cnt; idx++)
4192 trace_xfs_extlist(ip, idx, whichfork, caller_ip);
4193 }
4194
4195 /*
4196 * Validate that the bmbt_irecs being returned from bmapi are valid
4197 * given the callers original parameters. Specifically check the
4198 * ranges of the returned irecs to ensure that they only extent beyond
4199 * the given parameters if the XFS_BMAPI_ENTIRE flag was set.
4200 */
4201 STATIC void
xfs_bmap_validate_ret(xfs_fileoff_t bno,xfs_filblks_t len,int flags,xfs_bmbt_irec_t * mval,int nmap,int ret_nmap)4202 xfs_bmap_validate_ret(
4203 xfs_fileoff_t bno,
4204 xfs_filblks_t len,
4205 int flags,
4206 xfs_bmbt_irec_t *mval,
4207 int nmap,
4208 int ret_nmap)
4209 {
4210 int i; /* index to map values */
4211
4212 ASSERT(ret_nmap <= nmap);
4213
4214 for (i = 0; i < ret_nmap; i++) {
4215 ASSERT(mval[i].br_blockcount > 0);
4216 if (!(flags & XFS_BMAPI_ENTIRE)) {
4217 ASSERT(mval[i].br_startoff >= bno);
4218 ASSERT(mval[i].br_blockcount <= len);
4219 ASSERT(mval[i].br_startoff + mval[i].br_blockcount <=
4220 bno + len);
4221 } else {
4222 ASSERT(mval[i].br_startoff < bno + len);
4223 ASSERT(mval[i].br_startoff + mval[i].br_blockcount >
4224 bno);
4225 }
4226 ASSERT(i == 0 ||
4227 mval[i - 1].br_startoff + mval[i - 1].br_blockcount ==
4228 mval[i].br_startoff);
4229 ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK &&
4230 mval[i].br_startblock != HOLESTARTBLOCK);
4231 ASSERT(mval[i].br_state == XFS_EXT_NORM ||
4232 mval[i].br_state == XFS_EXT_UNWRITTEN);
4233 }
4234 }
4235 #endif /* DEBUG */
4236
4237
4238 /*
4239 * Trim the returned map to the required bounds
4240 */
4241 STATIC void
xfs_bmapi_trim_map(struct xfs_bmbt_irec * mval,struct xfs_bmbt_irec * got,xfs_fileoff_t * bno,xfs_filblks_t len,xfs_fileoff_t obno,xfs_fileoff_t end,int n,int flags)4242 xfs_bmapi_trim_map(
4243 struct xfs_bmbt_irec *mval,
4244 struct xfs_bmbt_irec *got,
4245 xfs_fileoff_t *bno,
4246 xfs_filblks_t len,
4247 xfs_fileoff_t obno,
4248 xfs_fileoff_t end,
4249 int n,
4250 int flags)
4251 {
4252 if ((flags & XFS_BMAPI_ENTIRE) ||
4253 got->br_startoff + got->br_blockcount <= obno) {
4254 *mval = *got;
4255 if (isnullstartblock(got->br_startblock))
4256 mval->br_startblock = DELAYSTARTBLOCK;
4257 return;
4258 }
4259
4260 if (obno > *bno)
4261 *bno = obno;
4262 ASSERT((*bno >= obno) || (n == 0));
4263 ASSERT(*bno < end);
4264 mval->br_startoff = *bno;
4265 if (isnullstartblock(got->br_startblock))
4266 mval->br_startblock = DELAYSTARTBLOCK;
4267 else
4268 mval->br_startblock = got->br_startblock +
4269 (*bno - got->br_startoff);
4270 /*
4271 * Return the minimum of what we got and what we asked for for
4272 * the length. We can use the len variable here because it is
4273 * modified below and we could have been there before coming
4274 * here if the first part of the allocation didn't overlap what
4275 * was asked for.
4276 */
4277 mval->br_blockcount = XFS_FILBLKS_MIN(end - *bno,
4278 got->br_blockcount - (*bno - got->br_startoff));
4279 mval->br_state = got->br_state;
4280 ASSERT(mval->br_blockcount <= len);
4281 return;
4282 }
4283
4284 /*
4285 * Update and validate the extent map to return
4286 */
4287 STATIC void
xfs_bmapi_update_map(struct xfs_bmbt_irec ** map,xfs_fileoff_t * bno,xfs_filblks_t * len,xfs_fileoff_t obno,xfs_fileoff_t end,int * n,int flags)4288 xfs_bmapi_update_map(
4289 struct xfs_bmbt_irec **map,
4290 xfs_fileoff_t *bno,
4291 xfs_filblks_t *len,
4292 xfs_fileoff_t obno,
4293 xfs_fileoff_t end,
4294 int *n,
4295 int flags)
4296 {
4297 xfs_bmbt_irec_t *mval = *map;
4298
4299 ASSERT((flags & XFS_BMAPI_ENTIRE) ||
4300 ((mval->br_startoff + mval->br_blockcount) <= end));
4301 ASSERT((flags & XFS_BMAPI_ENTIRE) || (mval->br_blockcount <= *len) ||
4302 (mval->br_startoff < obno));
4303
4304 *bno = mval->br_startoff + mval->br_blockcount;
4305 *len = end - *bno;
4306 if (*n > 0 && mval->br_startoff == mval[-1].br_startoff) {
4307 /* update previous map with new information */
4308 ASSERT(mval->br_startblock == mval[-1].br_startblock);
4309 ASSERT(mval->br_blockcount > mval[-1].br_blockcount);
4310 ASSERT(mval->br_state == mval[-1].br_state);
4311 mval[-1].br_blockcount = mval->br_blockcount;
4312 mval[-1].br_state = mval->br_state;
4313 } else if (*n > 0 && mval->br_startblock != DELAYSTARTBLOCK &&
4314 mval[-1].br_startblock != DELAYSTARTBLOCK &&
4315 mval[-1].br_startblock != HOLESTARTBLOCK &&
4316 mval->br_startblock == mval[-1].br_startblock +
4317 mval[-1].br_blockcount &&
4318 ((flags & XFS_BMAPI_IGSTATE) ||
4319 mval[-1].br_state == mval->br_state)) {
4320 ASSERT(mval->br_startoff ==
4321 mval[-1].br_startoff + mval[-1].br_blockcount);
4322 mval[-1].br_blockcount += mval->br_blockcount;
4323 } else if (*n > 0 &&
4324 mval->br_startblock == DELAYSTARTBLOCK &&
4325 mval[-1].br_startblock == DELAYSTARTBLOCK &&
4326 mval->br_startoff ==
4327 mval[-1].br_startoff + mval[-1].br_blockcount) {
4328 mval[-1].br_blockcount += mval->br_blockcount;
4329 mval[-1].br_state = mval->br_state;
4330 } else if (!((*n == 0) &&
4331 ((mval->br_startoff + mval->br_blockcount) <=
4332 obno))) {
4333 mval++;
4334 (*n)++;
4335 }
4336 *map = mval;
4337 }
4338
4339 /*
4340 * Map file blocks to filesystem blocks without allocation.
4341 */
4342 int
xfs_bmapi_read(struct xfs_inode * ip,xfs_fileoff_t bno,xfs_filblks_t len,struct xfs_bmbt_irec * mval,int * nmap,int flags)4343 xfs_bmapi_read(
4344 struct xfs_inode *ip,
4345 xfs_fileoff_t bno,
4346 xfs_filblks_t len,
4347 struct xfs_bmbt_irec *mval,
4348 int *nmap,
4349 int flags)
4350 {
4351 struct xfs_mount *mp = ip->i_mount;
4352 struct xfs_ifork *ifp;
4353 struct xfs_bmbt_irec got;
4354 struct xfs_bmbt_irec prev;
4355 xfs_fileoff_t obno;
4356 xfs_fileoff_t end;
4357 xfs_extnum_t lastx;
4358 int error;
4359 int eof;
4360 int n = 0;
4361 int whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
4362 XFS_ATTR_FORK : XFS_DATA_FORK;
4363
4364 ASSERT(*nmap >= 1);
4365 ASSERT(!(flags & ~(XFS_BMAPI_ATTRFORK|XFS_BMAPI_ENTIRE|
4366 XFS_BMAPI_IGSTATE)));
4367
4368 if (unlikely(XFS_TEST_ERROR(
4369 (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4370 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
4371 mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
4372 XFS_ERROR_REPORT("xfs_bmapi_read", XFS_ERRLEVEL_LOW, mp);
4373 return XFS_ERROR(EFSCORRUPTED);
4374 }
4375
4376 if (XFS_FORCED_SHUTDOWN(mp))
4377 return XFS_ERROR(EIO);
4378
4379 XFS_STATS_INC(xs_blk_mapr);
4380
4381 ifp = XFS_IFORK_PTR(ip, whichfork);
4382
4383 if (!(ifp->if_flags & XFS_IFEXTENTS)) {
4384 error = xfs_iread_extents(NULL, ip, whichfork);
4385 if (error)
4386 return error;
4387 }
4388
4389 xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got, &prev);
4390 end = bno + len;
4391 obno = bno;
4392
4393 while (bno < end && n < *nmap) {
4394 /* Reading past eof, act as though there's a hole up to end. */
4395 if (eof)
4396 got.br_startoff = end;
4397 if (got.br_startoff > bno) {
4398 /* Reading in a hole. */
4399 mval->br_startoff = bno;
4400 mval->br_startblock = HOLESTARTBLOCK;
4401 mval->br_blockcount =
4402 XFS_FILBLKS_MIN(len, got.br_startoff - bno);
4403 mval->br_state = XFS_EXT_NORM;
4404 bno += mval->br_blockcount;
4405 len -= mval->br_blockcount;
4406 mval++;
4407 n++;
4408 continue;
4409 }
4410
4411 /* set up the extent map to return. */
4412 xfs_bmapi_trim_map(mval, &got, &bno, len, obno, end, n, flags);
4413 xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
4414
4415 /* If we're done, stop now. */
4416 if (bno >= end || n >= *nmap)
4417 break;
4418
4419 /* Else go on to the next record. */
4420 if (++lastx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t))
4421 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx), &got);
4422 else
4423 eof = 1;
4424 }
4425 *nmap = n;
4426 return 0;
4427 }
4428
4429 STATIC int
xfs_bmapi_reserve_delalloc(struct xfs_inode * ip,xfs_fileoff_t aoff,xfs_filblks_t len,struct xfs_bmbt_irec * got,struct xfs_bmbt_irec * prev,xfs_extnum_t * lastx,int eof)4430 xfs_bmapi_reserve_delalloc(
4431 struct xfs_inode *ip,
4432 xfs_fileoff_t aoff,
4433 xfs_filblks_t len,
4434 struct xfs_bmbt_irec *got,
4435 struct xfs_bmbt_irec *prev,
4436 xfs_extnum_t *lastx,
4437 int eof)
4438 {
4439 struct xfs_mount *mp = ip->i_mount;
4440 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
4441 xfs_extlen_t alen;
4442 xfs_extlen_t indlen;
4443 char rt = XFS_IS_REALTIME_INODE(ip);
4444 xfs_extlen_t extsz;
4445 int error;
4446
4447 alen = XFS_FILBLKS_MIN(len, MAXEXTLEN);
4448 if (!eof)
4449 alen = XFS_FILBLKS_MIN(alen, got->br_startoff - aoff);
4450
4451 /* Figure out the extent size, adjust alen */
4452 extsz = xfs_get_extsz_hint(ip);
4453 if (extsz) {
4454 /*
4455 * Make sure we don't exceed a single extent length when we
4456 * align the extent by reducing length we are going to
4457 * allocate by the maximum amount extent size aligment may
4458 * require.
4459 */
4460 alen = XFS_FILBLKS_MIN(len, MAXEXTLEN - (2 * extsz - 1));
4461 error = xfs_bmap_extsize_align(mp, got, prev, extsz, rt, eof,
4462 1, 0, &aoff, &alen);
4463 ASSERT(!error);
4464 }
4465
4466 if (rt)
4467 extsz = alen / mp->m_sb.sb_rextsize;
4468
4469 /*
4470 * Make a transaction-less quota reservation for delayed allocation
4471 * blocks. This number gets adjusted later. We return if we haven't
4472 * allocated blocks already inside this loop.
4473 */
4474 error = xfs_trans_reserve_quota_nblks(NULL, ip, (long)alen, 0,
4475 rt ? XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS);
4476 if (error)
4477 return error;
4478
4479 /*
4480 * Split changing sb for alen and indlen since they could be coming
4481 * from different places.
4482 */
4483 indlen = (xfs_extlen_t)xfs_bmap_worst_indlen(ip, alen);
4484 ASSERT(indlen > 0);
4485
4486 if (rt) {
4487 error = xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS,
4488 -((int64_t)extsz), 0);
4489 } else {
4490 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
4491 -((int64_t)alen), 0);
4492 }
4493
4494 if (error)
4495 goto out_unreserve_quota;
4496
4497 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
4498 -((int64_t)indlen), 0);
4499 if (error)
4500 goto out_unreserve_blocks;
4501
4502
4503 ip->i_delayed_blks += alen;
4504
4505 got->br_startoff = aoff;
4506 got->br_startblock = nullstartblock(indlen);
4507 got->br_blockcount = alen;
4508 got->br_state = XFS_EXT_NORM;
4509 xfs_bmap_add_extent_hole_delay(ip, lastx, got);
4510
4511 /*
4512 * Update our extent pointer, given that xfs_bmap_add_extent_hole_delay
4513 * might have merged it into one of the neighbouring ones.
4514 */
4515 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *lastx), got);
4516
4517 ASSERT(got->br_startoff <= aoff);
4518 ASSERT(got->br_startoff + got->br_blockcount >= aoff + alen);
4519 ASSERT(isnullstartblock(got->br_startblock));
4520 ASSERT(got->br_state == XFS_EXT_NORM);
4521 return 0;
4522
4523 out_unreserve_blocks:
4524 if (rt)
4525 xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS, extsz, 0);
4526 else
4527 xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS, alen, 0);
4528 out_unreserve_quota:
4529 if (XFS_IS_QUOTA_ON(mp))
4530 xfs_trans_unreserve_quota_nblks(NULL, ip, alen, 0, rt ?
4531 XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS);
4532 return error;
4533 }
4534
4535 /*
4536 * Map file blocks to filesystem blocks, adding delayed allocations as needed.
4537 */
4538 int
xfs_bmapi_delay(struct xfs_inode * ip,xfs_fileoff_t bno,xfs_filblks_t len,struct xfs_bmbt_irec * mval,int * nmap,int flags)4539 xfs_bmapi_delay(
4540 struct xfs_inode *ip, /* incore inode */
4541 xfs_fileoff_t bno, /* starting file offs. mapped */
4542 xfs_filblks_t len, /* length to map in file */
4543 struct xfs_bmbt_irec *mval, /* output: map values */
4544 int *nmap, /* i/o: mval size/count */
4545 int flags) /* XFS_BMAPI_... */
4546 {
4547 struct xfs_mount *mp = ip->i_mount;
4548 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
4549 struct xfs_bmbt_irec got; /* current file extent record */
4550 struct xfs_bmbt_irec prev; /* previous file extent record */
4551 xfs_fileoff_t obno; /* old block number (offset) */
4552 xfs_fileoff_t end; /* end of mapped file region */
4553 xfs_extnum_t lastx; /* last useful extent number */
4554 int eof; /* we've hit the end of extents */
4555 int n = 0; /* current extent index */
4556 int error = 0;
4557
4558 ASSERT(*nmap >= 1);
4559 ASSERT(*nmap <= XFS_BMAP_MAX_NMAP);
4560 ASSERT(!(flags & ~XFS_BMAPI_ENTIRE));
4561
4562 if (unlikely(XFS_TEST_ERROR(
4563 (XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_EXTENTS &&
4564 XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_BTREE),
4565 mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
4566 XFS_ERROR_REPORT("xfs_bmapi_delay", XFS_ERRLEVEL_LOW, mp);
4567 return XFS_ERROR(EFSCORRUPTED);
4568 }
4569
4570 if (XFS_FORCED_SHUTDOWN(mp))
4571 return XFS_ERROR(EIO);
4572
4573 XFS_STATS_INC(xs_blk_mapw);
4574
4575 if (!(ifp->if_flags & XFS_IFEXTENTS)) {
4576 error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
4577 if (error)
4578 return error;
4579 }
4580
4581 xfs_bmap_search_extents(ip, bno, XFS_DATA_FORK, &eof, &lastx, &got, &prev);
4582 end = bno + len;
4583 obno = bno;
4584
4585 while (bno < end && n < *nmap) {
4586 if (eof || got.br_startoff > bno) {
4587 error = xfs_bmapi_reserve_delalloc(ip, bno, len, &got,
4588 &prev, &lastx, eof);
4589 if (error) {
4590 if (n == 0) {
4591 *nmap = 0;
4592 return error;
4593 }
4594 break;
4595 }
4596 }
4597
4598 /* set up the extent map to return. */
4599 xfs_bmapi_trim_map(mval, &got, &bno, len, obno, end, n, flags);
4600 xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
4601
4602 /* If we're done, stop now. */
4603 if (bno >= end || n >= *nmap)
4604 break;
4605
4606 /* Else go on to the next record. */
4607 prev = got;
4608 if (++lastx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t))
4609 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx), &got);
4610 else
4611 eof = 1;
4612 }
4613
4614 *nmap = n;
4615 return 0;
4616 }
4617
4618
4619 STATIC int
xfs_bmapi_allocate(struct xfs_bmalloca * bma,int flags)4620 xfs_bmapi_allocate(
4621 struct xfs_bmalloca *bma,
4622 int flags)
4623 {
4624 struct xfs_mount *mp = bma->ip->i_mount;
4625 int whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
4626 XFS_ATTR_FORK : XFS_DATA_FORK;
4627 struct xfs_ifork *ifp = XFS_IFORK_PTR(bma->ip, whichfork);
4628 int tmp_logflags = 0;
4629 int error;
4630 int rt;
4631
4632 ASSERT(bma->length > 0);
4633
4634 rt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(bma->ip);
4635
4636 /*
4637 * For the wasdelay case, we could also just allocate the stuff asked
4638 * for in this bmap call but that wouldn't be as good.
4639 */
4640 if (bma->wasdel) {
4641 bma->length = (xfs_extlen_t)bma->got.br_blockcount;
4642 bma->offset = bma->got.br_startoff;
4643 if (bma->idx != NULLEXTNUM && bma->idx) {
4644 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1),
4645 &bma->prev);
4646 }
4647 } else {
4648 bma->length = XFS_FILBLKS_MIN(bma->length, MAXEXTLEN);
4649 if (!bma->eof)
4650 bma->length = XFS_FILBLKS_MIN(bma->length,
4651 bma->got.br_startoff - bma->offset);
4652 }
4653
4654 /*
4655 * Indicate if this is the first user data in the file, or just any
4656 * user data.
4657 */
4658 if (!(flags & XFS_BMAPI_METADATA)) {
4659 bma->userdata = (bma->offset == 0) ?
4660 XFS_ALLOC_INITIAL_USER_DATA : XFS_ALLOC_USERDATA;
4661 }
4662
4663 bma->minlen = (flags & XFS_BMAPI_CONTIG) ? bma->length : 1;
4664
4665 /*
4666 * Only want to do the alignment at the eof if it is userdata and
4667 * allocation length is larger than a stripe unit.
4668 */
4669 if (mp->m_dalign && bma->length >= mp->m_dalign &&
4670 !(flags & XFS_BMAPI_METADATA) && whichfork == XFS_DATA_FORK) {
4671 error = xfs_bmap_isaeof(bma, whichfork);
4672 if (error)
4673 return error;
4674 }
4675
4676 error = xfs_bmap_alloc(bma);
4677 if (error)
4678 return error;
4679
4680 if (bma->flist->xbf_low)
4681 bma->minleft = 0;
4682 if (bma->cur)
4683 bma->cur->bc_private.b.firstblock = *bma->firstblock;
4684 if (bma->blkno == NULLFSBLOCK)
4685 return 0;
4686 if ((ifp->if_flags & XFS_IFBROOT) && !bma->cur) {
4687 bma->cur = xfs_bmbt_init_cursor(mp, bma->tp, bma->ip, whichfork);
4688 bma->cur->bc_private.b.firstblock = *bma->firstblock;
4689 bma->cur->bc_private.b.flist = bma->flist;
4690 }
4691 /*
4692 * Bump the number of extents we've allocated
4693 * in this call.
4694 */
4695 bma->nallocs++;
4696
4697 if (bma->cur)
4698 bma->cur->bc_private.b.flags =
4699 bma->wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
4700
4701 bma->got.br_startoff = bma->offset;
4702 bma->got.br_startblock = bma->blkno;
4703 bma->got.br_blockcount = bma->length;
4704 bma->got.br_state = XFS_EXT_NORM;
4705
4706 /*
4707 * A wasdelay extent has been initialized, so shouldn't be flagged
4708 * as unwritten.
4709 */
4710 if (!bma->wasdel && (flags & XFS_BMAPI_PREALLOC) &&
4711 xfs_sb_version_hasextflgbit(&mp->m_sb))
4712 bma->got.br_state = XFS_EXT_UNWRITTEN;
4713
4714 if (bma->wasdel)
4715 error = xfs_bmap_add_extent_delay_real(bma);
4716 else
4717 error = xfs_bmap_add_extent_hole_real(bma, whichfork);
4718
4719 bma->logflags |= tmp_logflags;
4720 if (error)
4721 return error;
4722
4723 /*
4724 * Update our extent pointer, given that xfs_bmap_add_extent_delay_real
4725 * or xfs_bmap_add_extent_hole_real might have merged it into one of
4726 * the neighbouring ones.
4727 */
4728 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &bma->got);
4729
4730 ASSERT(bma->got.br_startoff <= bma->offset);
4731 ASSERT(bma->got.br_startoff + bma->got.br_blockcount >=
4732 bma->offset + bma->length);
4733 ASSERT(bma->got.br_state == XFS_EXT_NORM ||
4734 bma->got.br_state == XFS_EXT_UNWRITTEN);
4735 return 0;
4736 }
4737
4738 STATIC int
xfs_bmapi_convert_unwritten(struct xfs_bmalloca * bma,struct xfs_bmbt_irec * mval,xfs_filblks_t len,int flags)4739 xfs_bmapi_convert_unwritten(
4740 struct xfs_bmalloca *bma,
4741 struct xfs_bmbt_irec *mval,
4742 xfs_filblks_t len,
4743 int flags)
4744 {
4745 int whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
4746 XFS_ATTR_FORK : XFS_DATA_FORK;
4747 struct xfs_ifork *ifp = XFS_IFORK_PTR(bma->ip, whichfork);
4748 int tmp_logflags = 0;
4749 int error;
4750
4751 /* check if we need to do unwritten->real conversion */
4752 if (mval->br_state == XFS_EXT_UNWRITTEN &&
4753 (flags & XFS_BMAPI_PREALLOC))
4754 return 0;
4755
4756 /* check if we need to do real->unwritten conversion */
4757 if (mval->br_state == XFS_EXT_NORM &&
4758 (flags & (XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT)) !=
4759 (XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT))
4760 return 0;
4761
4762 /*
4763 * Modify (by adding) the state flag, if writing.
4764 */
4765 ASSERT(mval->br_blockcount <= len);
4766 if ((ifp->if_flags & XFS_IFBROOT) && !bma->cur) {
4767 bma->cur = xfs_bmbt_init_cursor(bma->ip->i_mount, bma->tp,
4768 bma->ip, whichfork);
4769 bma->cur->bc_private.b.firstblock = *bma->firstblock;
4770 bma->cur->bc_private.b.flist = bma->flist;
4771 }
4772 mval->br_state = (mval->br_state == XFS_EXT_UNWRITTEN)
4773 ? XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
4774
4775 error = xfs_bmap_add_extent_unwritten_real(bma->tp, bma->ip, &bma->idx,
4776 &bma->cur, mval, bma->firstblock, bma->flist,
4777 &tmp_logflags);
4778 bma->logflags |= tmp_logflags;
4779 if (error)
4780 return error;
4781
4782 /*
4783 * Update our extent pointer, given that
4784 * xfs_bmap_add_extent_unwritten_real might have merged it into one
4785 * of the neighbouring ones.
4786 */
4787 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &bma->got);
4788
4789 /*
4790 * We may have combined previously unwritten space with written space,
4791 * so generate another request.
4792 */
4793 if (mval->br_blockcount < len)
4794 return EAGAIN;
4795 return 0;
4796 }
4797
4798 /*
4799 * Map file blocks to filesystem blocks, and allocate blocks or convert the
4800 * extent state if necessary. Details behaviour is controlled by the flags
4801 * parameter. Only allocates blocks from a single allocation group, to avoid
4802 * locking problems.
4803 *
4804 * The returned value in "firstblock" from the first call in a transaction
4805 * must be remembered and presented to subsequent calls in "firstblock".
4806 * An upper bound for the number of blocks to be allocated is supplied to
4807 * the first call in "total"; if no allocation group has that many free
4808 * blocks then the call will fail (return NULLFSBLOCK in "firstblock").
4809 */
4810 int
xfs_bmapi_write(struct xfs_trans * tp,struct xfs_inode * ip,xfs_fileoff_t bno,xfs_filblks_t len,int flags,xfs_fsblock_t * firstblock,xfs_extlen_t total,struct xfs_bmbt_irec * mval,int * nmap,struct xfs_bmap_free * flist)4811 xfs_bmapi_write(
4812 struct xfs_trans *tp, /* transaction pointer */
4813 struct xfs_inode *ip, /* incore inode */
4814 xfs_fileoff_t bno, /* starting file offs. mapped */
4815 xfs_filblks_t len, /* length to map in file */
4816 int flags, /* XFS_BMAPI_... */
4817 xfs_fsblock_t *firstblock, /* first allocated block
4818 controls a.g. for allocs */
4819 xfs_extlen_t total, /* total blocks needed */
4820 struct xfs_bmbt_irec *mval, /* output: map values */
4821 int *nmap, /* i/o: mval size/count */
4822 struct xfs_bmap_free *flist) /* i/o: list extents to free */
4823 {
4824 struct xfs_mount *mp = ip->i_mount;
4825 struct xfs_ifork *ifp;
4826 struct xfs_bmalloca bma = { 0 }; /* args for xfs_bmap_alloc */
4827 xfs_fileoff_t end; /* end of mapped file region */
4828 int eof; /* after the end of extents */
4829 int error; /* error return */
4830 int n; /* current extent index */
4831 xfs_fileoff_t obno; /* old block number (offset) */
4832 int whichfork; /* data or attr fork */
4833 char inhole; /* current location is hole in file */
4834 char wasdelay; /* old extent was delayed */
4835
4836 #ifdef DEBUG
4837 xfs_fileoff_t orig_bno; /* original block number value */
4838 int orig_flags; /* original flags arg value */
4839 xfs_filblks_t orig_len; /* original value of len arg */
4840 struct xfs_bmbt_irec *orig_mval; /* original value of mval */
4841 int orig_nmap; /* original value of *nmap */
4842
4843 orig_bno = bno;
4844 orig_len = len;
4845 orig_flags = flags;
4846 orig_mval = mval;
4847 orig_nmap = *nmap;
4848 #endif
4849
4850 ASSERT(*nmap >= 1);
4851 ASSERT(*nmap <= XFS_BMAP_MAX_NMAP);
4852 ASSERT(!(flags & XFS_BMAPI_IGSTATE));
4853 ASSERT(tp != NULL);
4854 ASSERT(len > 0);
4855
4856 whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
4857 XFS_ATTR_FORK : XFS_DATA_FORK;
4858
4859 if (unlikely(XFS_TEST_ERROR(
4860 (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4861 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4862 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL),
4863 mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
4864 XFS_ERROR_REPORT("xfs_bmapi_write", XFS_ERRLEVEL_LOW, mp);
4865 return XFS_ERROR(EFSCORRUPTED);
4866 }
4867
4868 if (XFS_FORCED_SHUTDOWN(mp))
4869 return XFS_ERROR(EIO);
4870
4871 ifp = XFS_IFORK_PTR(ip, whichfork);
4872
4873 XFS_STATS_INC(xs_blk_mapw);
4874
4875 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4876 error = xfs_bmap_local_to_extents(tp, ip, firstblock, total,
4877 &bma.logflags, whichfork);
4878 if (error)
4879 goto error0;
4880 }
4881
4882 if (*firstblock == NULLFSBLOCK) {
4883 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE)
4884 bma.minleft = be16_to_cpu(ifp->if_broot->bb_level) + 1;
4885 else
4886 bma.minleft = 1;
4887 } else {
4888 bma.minleft = 0;
4889 }
4890
4891 if (!(ifp->if_flags & XFS_IFEXTENTS)) {
4892 error = xfs_iread_extents(tp, ip, whichfork);
4893 if (error)
4894 goto error0;
4895 }
4896
4897 xfs_bmap_search_extents(ip, bno, whichfork, &eof, &bma.idx, &bma.got,
4898 &bma.prev);
4899 n = 0;
4900 end = bno + len;
4901 obno = bno;
4902
4903 bma.tp = tp;
4904 bma.ip = ip;
4905 bma.total = total;
4906 bma.userdata = 0;
4907 bma.flist = flist;
4908 bma.firstblock = firstblock;
4909
4910 while (bno < end && n < *nmap) {
4911 inhole = eof || bma.got.br_startoff > bno;
4912 wasdelay = !inhole && isnullstartblock(bma.got.br_startblock);
4913
4914 /*
4915 * First, deal with the hole before the allocated space
4916 * that we found, if any.
4917 */
4918 if (inhole || wasdelay) {
4919 bma.eof = eof;
4920 bma.conv = !!(flags & XFS_BMAPI_CONVERT);
4921 bma.wasdel = wasdelay;
4922 bma.offset = bno;
4923
4924 /*
4925 * There's a 32/64 bit type mismatch between the
4926 * allocation length request (which can be 64 bits in
4927 * length) and the bma length request, which is
4928 * xfs_extlen_t and therefore 32 bits. Hence we have to
4929 * check for 32-bit overflows and handle them here.
4930 */
4931 if (len > (xfs_filblks_t)MAXEXTLEN)
4932 bma.length = MAXEXTLEN;
4933 else
4934 bma.length = len;
4935
4936 ASSERT(len > 0);
4937 ASSERT(bma.length > 0);
4938 error = xfs_bmapi_allocate(&bma, flags);
4939 if (error)
4940 goto error0;
4941 if (bma.blkno == NULLFSBLOCK)
4942 break;
4943 }
4944
4945 /* Deal with the allocated space we found. */
4946 xfs_bmapi_trim_map(mval, &bma.got, &bno, len, obno,
4947 end, n, flags);
4948
4949 /* Execute unwritten extent conversion if necessary */
4950 error = xfs_bmapi_convert_unwritten(&bma, mval, len, flags);
4951 if (error == EAGAIN)
4952 continue;
4953 if (error)
4954 goto error0;
4955
4956 /* update the extent map to return */
4957 xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
4958
4959 /*
4960 * If we're done, stop now. Stop when we've allocated
4961 * XFS_BMAP_MAX_NMAP extents no matter what. Otherwise
4962 * the transaction may get too big.
4963 */
4964 if (bno >= end || n >= *nmap || bma.nallocs >= *nmap)
4965 break;
4966
4967 /* Else go on to the next record. */
4968 bma.prev = bma.got;
4969 if (++bma.idx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t)) {
4970 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma.idx),
4971 &bma.got);
4972 } else
4973 eof = 1;
4974 }
4975 *nmap = n;
4976
4977 /*
4978 * Transform from btree to extents, give it cur.
4979 */
4980 if (xfs_bmap_wants_extents(ip, whichfork)) {
4981 int tmp_logflags = 0;
4982
4983 ASSERT(bma.cur);
4984 error = xfs_bmap_btree_to_extents(tp, ip, bma.cur,
4985 &tmp_logflags, whichfork);
4986 bma.logflags |= tmp_logflags;
4987 if (error)
4988 goto error0;
4989 }
4990
4991 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE ||
4992 XFS_IFORK_NEXTENTS(ip, whichfork) >
4993 XFS_IFORK_MAXEXT(ip, whichfork));
4994 error = 0;
4995 error0:
4996 /*
4997 * Log everything. Do this after conversion, there's no point in
4998 * logging the extent records if we've converted to btree format.
4999 */
5000 if ((bma.logflags & xfs_ilog_fext(whichfork)) &&
5001 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
5002 bma.logflags &= ~xfs_ilog_fext(whichfork);
5003 else if ((bma.logflags & xfs_ilog_fbroot(whichfork)) &&
5004 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
5005 bma.logflags &= ~xfs_ilog_fbroot(whichfork);
5006 /*
5007 * Log whatever the flags say, even if error. Otherwise we might miss
5008 * detecting a case where the data is changed, there's an error,
5009 * and it's not logged so we don't shutdown when we should.
5010 */
5011 if (bma.logflags)
5012 xfs_trans_log_inode(tp, ip, bma.logflags);
5013
5014 if (bma.cur) {
5015 if (!error) {
5016 ASSERT(*firstblock == NULLFSBLOCK ||
5017 XFS_FSB_TO_AGNO(mp, *firstblock) ==
5018 XFS_FSB_TO_AGNO(mp,
5019 bma.cur->bc_private.b.firstblock) ||
5020 (flist->xbf_low &&
5021 XFS_FSB_TO_AGNO(mp, *firstblock) <
5022 XFS_FSB_TO_AGNO(mp,
5023 bma.cur->bc_private.b.firstblock)));
5024 *firstblock = bma.cur->bc_private.b.firstblock;
5025 }
5026 xfs_btree_del_cursor(bma.cur,
5027 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
5028 }
5029 if (!error)
5030 xfs_bmap_validate_ret(orig_bno, orig_len, orig_flags, orig_mval,
5031 orig_nmap, *nmap);
5032 return error;
5033 }
5034
5035 /*
5036 * Unmap (remove) blocks from a file.
5037 * If nexts is nonzero then the number of extents to remove is limited to
5038 * that value. If not all extents in the block range can be removed then
5039 * *done is set.
5040 */
5041 int /* error */
xfs_bunmapi(xfs_trans_t * tp,struct xfs_inode * ip,xfs_fileoff_t bno,xfs_filblks_t len,int flags,xfs_extnum_t nexts,xfs_fsblock_t * firstblock,xfs_bmap_free_t * flist,int * done)5042 xfs_bunmapi(
5043 xfs_trans_t *tp, /* transaction pointer */
5044 struct xfs_inode *ip, /* incore inode */
5045 xfs_fileoff_t bno, /* starting offset to unmap */
5046 xfs_filblks_t len, /* length to unmap in file */
5047 int flags, /* misc flags */
5048 xfs_extnum_t nexts, /* number of extents max */
5049 xfs_fsblock_t *firstblock, /* first allocated block
5050 controls a.g. for allocs */
5051 xfs_bmap_free_t *flist, /* i/o: list extents to free */
5052 int *done) /* set if not done yet */
5053 {
5054 xfs_btree_cur_t *cur; /* bmap btree cursor */
5055 xfs_bmbt_irec_t del; /* extent being deleted */
5056 int eof; /* is deleting at eof */
5057 xfs_bmbt_rec_host_t *ep; /* extent record pointer */
5058 int error; /* error return value */
5059 xfs_extnum_t extno; /* extent number in list */
5060 xfs_bmbt_irec_t got; /* current extent record */
5061 xfs_ifork_t *ifp; /* inode fork pointer */
5062 int isrt; /* freeing in rt area */
5063 xfs_extnum_t lastx; /* last extent index used */
5064 int logflags; /* transaction logging flags */
5065 xfs_extlen_t mod; /* rt extent offset */
5066 xfs_mount_t *mp; /* mount structure */
5067 xfs_extnum_t nextents; /* number of file extents */
5068 xfs_bmbt_irec_t prev; /* previous extent record */
5069 xfs_fileoff_t start; /* first file offset deleted */
5070 int tmp_logflags; /* partial logging flags */
5071 int wasdel; /* was a delayed alloc extent */
5072 int whichfork; /* data or attribute fork */
5073 xfs_fsblock_t sum;
5074
5075 trace_xfs_bunmap(ip, bno, len, flags, _RET_IP_);
5076
5077 whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
5078 XFS_ATTR_FORK : XFS_DATA_FORK;
5079 ifp = XFS_IFORK_PTR(ip, whichfork);
5080 if (unlikely(
5081 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
5082 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) {
5083 XFS_ERROR_REPORT("xfs_bunmapi", XFS_ERRLEVEL_LOW,
5084 ip->i_mount);
5085 return XFS_ERROR(EFSCORRUPTED);
5086 }
5087 mp = ip->i_mount;
5088 if (XFS_FORCED_SHUTDOWN(mp))
5089 return XFS_ERROR(EIO);
5090
5091 ASSERT(len > 0);
5092 ASSERT(nexts >= 0);
5093
5094 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5095 (error = xfs_iread_extents(tp, ip, whichfork)))
5096 return error;
5097 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5098 if (nextents == 0) {
5099 *done = 1;
5100 return 0;
5101 }
5102 XFS_STATS_INC(xs_blk_unmap);
5103 isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
5104 start = bno;
5105 bno = start + len - 1;
5106 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
5107 &prev);
5108
5109 /*
5110 * Check to see if the given block number is past the end of the
5111 * file, back up to the last block if so...
5112 */
5113 if (eof) {
5114 ep = xfs_iext_get_ext(ifp, --lastx);
5115 xfs_bmbt_get_all(ep, &got);
5116 bno = got.br_startoff + got.br_blockcount - 1;
5117 }
5118 logflags = 0;
5119 if (ifp->if_flags & XFS_IFBROOT) {
5120 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
5121 cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
5122 cur->bc_private.b.firstblock = *firstblock;
5123 cur->bc_private.b.flist = flist;
5124 cur->bc_private.b.flags = 0;
5125 } else
5126 cur = NULL;
5127
5128 if (isrt) {
5129 /*
5130 * Synchronize by locking the bitmap inode.
5131 */
5132 xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL);
5133 xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
5134 }
5135
5136 extno = 0;
5137 while (bno != (xfs_fileoff_t)-1 && bno >= start && lastx >= 0 &&
5138 (nexts == 0 || extno < nexts)) {
5139 /*
5140 * Is the found extent after a hole in which bno lives?
5141 * Just back up to the previous extent, if so.
5142 */
5143 if (got.br_startoff > bno) {
5144 if (--lastx < 0)
5145 break;
5146 ep = xfs_iext_get_ext(ifp, lastx);
5147 xfs_bmbt_get_all(ep, &got);
5148 }
5149 /*
5150 * Is the last block of this extent before the range
5151 * we're supposed to delete? If so, we're done.
5152 */
5153 bno = XFS_FILEOFF_MIN(bno,
5154 got.br_startoff + got.br_blockcount - 1);
5155 if (bno < start)
5156 break;
5157 /*
5158 * Then deal with the (possibly delayed) allocated space
5159 * we found.
5160 */
5161 ASSERT(ep != NULL);
5162 del = got;
5163 wasdel = isnullstartblock(del.br_startblock);
5164 if (got.br_startoff < start) {
5165 del.br_startoff = start;
5166 del.br_blockcount -= start - got.br_startoff;
5167 if (!wasdel)
5168 del.br_startblock += start - got.br_startoff;
5169 }
5170 if (del.br_startoff + del.br_blockcount > bno + 1)
5171 del.br_blockcount = bno + 1 - del.br_startoff;
5172 sum = del.br_startblock + del.br_blockcount;
5173 if (isrt &&
5174 (mod = do_mod(sum, mp->m_sb.sb_rextsize))) {
5175 /*
5176 * Realtime extent not lined up at the end.
5177 * The extent could have been split into written
5178 * and unwritten pieces, or we could just be
5179 * unmapping part of it. But we can't really
5180 * get rid of part of a realtime extent.
5181 */
5182 if (del.br_state == XFS_EXT_UNWRITTEN ||
5183 !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
5184 /*
5185 * This piece is unwritten, or we're not
5186 * using unwritten extents. Skip over it.
5187 */
5188 ASSERT(bno >= mod);
5189 bno -= mod > del.br_blockcount ?
5190 del.br_blockcount : mod;
5191 if (bno < got.br_startoff) {
5192 if (--lastx >= 0)
5193 xfs_bmbt_get_all(xfs_iext_get_ext(
5194 ifp, lastx), &got);
5195 }
5196 continue;
5197 }
5198 /*
5199 * It's written, turn it unwritten.
5200 * This is better than zeroing it.
5201 */
5202 ASSERT(del.br_state == XFS_EXT_NORM);
5203 ASSERT(xfs_trans_get_block_res(tp) > 0);
5204 /*
5205 * If this spans a realtime extent boundary,
5206 * chop it back to the start of the one we end at.
5207 */
5208 if (del.br_blockcount > mod) {
5209 del.br_startoff += del.br_blockcount - mod;
5210 del.br_startblock += del.br_blockcount - mod;
5211 del.br_blockcount = mod;
5212 }
5213 del.br_state = XFS_EXT_UNWRITTEN;
5214 error = xfs_bmap_add_extent_unwritten_real(tp, ip,
5215 &lastx, &cur, &del, firstblock, flist,
5216 &logflags);
5217 if (error)
5218 goto error0;
5219 goto nodelete;
5220 }
5221 if (isrt && (mod = do_mod(del.br_startblock, mp->m_sb.sb_rextsize))) {
5222 /*
5223 * Realtime extent is lined up at the end but not
5224 * at the front. We'll get rid of full extents if
5225 * we can.
5226 */
5227 mod = mp->m_sb.sb_rextsize - mod;
5228 if (del.br_blockcount > mod) {
5229 del.br_blockcount -= mod;
5230 del.br_startoff += mod;
5231 del.br_startblock += mod;
5232 } else if ((del.br_startoff == start &&
5233 (del.br_state == XFS_EXT_UNWRITTEN ||
5234 xfs_trans_get_block_res(tp) == 0)) ||
5235 !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
5236 /*
5237 * Can't make it unwritten. There isn't
5238 * a full extent here so just skip it.
5239 */
5240 ASSERT(bno >= del.br_blockcount);
5241 bno -= del.br_blockcount;
5242 if (got.br_startoff > bno) {
5243 if (--lastx >= 0) {
5244 ep = xfs_iext_get_ext(ifp,
5245 lastx);
5246 xfs_bmbt_get_all(ep, &got);
5247 }
5248 }
5249 continue;
5250 } else if (del.br_state == XFS_EXT_UNWRITTEN) {
5251 /*
5252 * This one is already unwritten.
5253 * It must have a written left neighbor.
5254 * Unwrite the killed part of that one and
5255 * try again.
5256 */
5257 ASSERT(lastx > 0);
5258 xfs_bmbt_get_all(xfs_iext_get_ext(ifp,
5259 lastx - 1), &prev);
5260 ASSERT(prev.br_state == XFS_EXT_NORM);
5261 ASSERT(!isnullstartblock(prev.br_startblock));
5262 ASSERT(del.br_startblock ==
5263 prev.br_startblock + prev.br_blockcount);
5264 if (prev.br_startoff < start) {
5265 mod = start - prev.br_startoff;
5266 prev.br_blockcount -= mod;
5267 prev.br_startblock += mod;
5268 prev.br_startoff = start;
5269 }
5270 prev.br_state = XFS_EXT_UNWRITTEN;
5271 lastx--;
5272 error = xfs_bmap_add_extent_unwritten_real(tp,
5273 ip, &lastx, &cur, &prev,
5274 firstblock, flist, &logflags);
5275 if (error)
5276 goto error0;
5277 goto nodelete;
5278 } else {
5279 ASSERT(del.br_state == XFS_EXT_NORM);
5280 del.br_state = XFS_EXT_UNWRITTEN;
5281 error = xfs_bmap_add_extent_unwritten_real(tp,
5282 ip, &lastx, &cur, &del,
5283 firstblock, flist, &logflags);
5284 if (error)
5285 goto error0;
5286 goto nodelete;
5287 }
5288 }
5289 if (wasdel) {
5290 ASSERT(startblockval(del.br_startblock) > 0);
5291 /* Update realtime/data freespace, unreserve quota */
5292 if (isrt) {
5293 xfs_filblks_t rtexts;
5294
5295 rtexts = XFS_FSB_TO_B(mp, del.br_blockcount);
5296 do_div(rtexts, mp->m_sb.sb_rextsize);
5297 xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS,
5298 (int64_t)rtexts, 0);
5299 (void)xfs_trans_reserve_quota_nblks(NULL,
5300 ip, -((long)del.br_blockcount), 0,
5301 XFS_QMOPT_RES_RTBLKS);
5302 } else {
5303 xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
5304 (int64_t)del.br_blockcount, 0);
5305 (void)xfs_trans_reserve_quota_nblks(NULL,
5306 ip, -((long)del.br_blockcount), 0,
5307 XFS_QMOPT_RES_REGBLKS);
5308 }
5309 ip->i_delayed_blks -= del.br_blockcount;
5310 if (cur)
5311 cur->bc_private.b.flags |=
5312 XFS_BTCUR_BPRV_WASDEL;
5313 } else if (cur)
5314 cur->bc_private.b.flags &= ~XFS_BTCUR_BPRV_WASDEL;
5315 /*
5316 * If it's the case where the directory code is running
5317 * with no block reservation, and the deleted block is in
5318 * the middle of its extent, and the resulting insert
5319 * of an extent would cause transformation to btree format,
5320 * then reject it. The calling code will then swap
5321 * blocks around instead.
5322 * We have to do this now, rather than waiting for the
5323 * conversion to btree format, since the transaction
5324 * will be dirty.
5325 */
5326 if (!wasdel && xfs_trans_get_block_res(tp) == 0 &&
5327 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
5328 XFS_IFORK_NEXTENTS(ip, whichfork) >= /* Note the >= */
5329 XFS_IFORK_MAXEXT(ip, whichfork) &&
5330 del.br_startoff > got.br_startoff &&
5331 del.br_startoff + del.br_blockcount <
5332 got.br_startoff + got.br_blockcount) {
5333 error = XFS_ERROR(ENOSPC);
5334 goto error0;
5335 }
5336 error = xfs_bmap_del_extent(ip, tp, &lastx, flist, cur, &del,
5337 &tmp_logflags, whichfork);
5338 logflags |= tmp_logflags;
5339 if (error)
5340 goto error0;
5341 bno = del.br_startoff - 1;
5342 nodelete:
5343 /*
5344 * If not done go on to the next (previous) record.
5345 */
5346 if (bno != (xfs_fileoff_t)-1 && bno >= start) {
5347 if (lastx >= 0) {
5348 ep = xfs_iext_get_ext(ifp, lastx);
5349 if (xfs_bmbt_get_startoff(ep) > bno) {
5350 if (--lastx >= 0)
5351 ep = xfs_iext_get_ext(ifp,
5352 lastx);
5353 }
5354 xfs_bmbt_get_all(ep, &got);
5355 }
5356 extno++;
5357 }
5358 }
5359 *done = bno == (xfs_fileoff_t)-1 || bno < start || lastx < 0;
5360
5361 /*
5362 * Convert to a btree if necessary.
5363 */
5364 if (xfs_bmap_needs_btree(ip, whichfork)) {
5365 ASSERT(cur == NULL);
5366 error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist,
5367 &cur, 0, &tmp_logflags, whichfork);
5368 logflags |= tmp_logflags;
5369 if (error)
5370 goto error0;
5371 }
5372 /*
5373 * transform from btree to extents, give it cur
5374 */
5375 else if (xfs_bmap_wants_extents(ip, whichfork)) {
5376 ASSERT(cur != NULL);
5377 error = xfs_bmap_btree_to_extents(tp, ip, cur, &tmp_logflags,
5378 whichfork);
5379 logflags |= tmp_logflags;
5380 if (error)
5381 goto error0;
5382 }
5383 /*
5384 * transform from extents to local?
5385 */
5386 error = 0;
5387 error0:
5388 /*
5389 * Log everything. Do this after conversion, there's no point in
5390 * logging the extent records if we've converted to btree format.
5391 */
5392 if ((logflags & xfs_ilog_fext(whichfork)) &&
5393 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
5394 logflags &= ~xfs_ilog_fext(whichfork);
5395 else if ((logflags & xfs_ilog_fbroot(whichfork)) &&
5396 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
5397 logflags &= ~xfs_ilog_fbroot(whichfork);
5398 /*
5399 * Log inode even in the error case, if the transaction
5400 * is dirty we'll need to shut down the filesystem.
5401 */
5402 if (logflags)
5403 xfs_trans_log_inode(tp, ip, logflags);
5404 if (cur) {
5405 if (!error) {
5406 *firstblock = cur->bc_private.b.firstblock;
5407 cur->bc_private.b.allocated = 0;
5408 }
5409 xfs_btree_del_cursor(cur,
5410 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
5411 }
5412 return error;
5413 }
5414
5415 /*
5416 * returns 1 for success, 0 if we failed to map the extent.
5417 */
5418 STATIC int
xfs_getbmapx_fix_eof_hole(xfs_inode_t * ip,struct getbmapx * out,int prealloced,__int64_t end,xfs_fsblock_t startblock)5419 xfs_getbmapx_fix_eof_hole(
5420 xfs_inode_t *ip, /* xfs incore inode pointer */
5421 struct getbmapx *out, /* output structure */
5422 int prealloced, /* this is a file with
5423 * preallocated data space */
5424 __int64_t end, /* last block requested */
5425 xfs_fsblock_t startblock)
5426 {
5427 __int64_t fixlen;
5428 xfs_mount_t *mp; /* file system mount point */
5429 xfs_ifork_t *ifp; /* inode fork pointer */
5430 xfs_extnum_t lastx; /* last extent pointer */
5431 xfs_fileoff_t fileblock;
5432
5433 if (startblock == HOLESTARTBLOCK) {
5434 mp = ip->i_mount;
5435 out->bmv_block = -1;
5436 fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, XFS_ISIZE(ip)));
5437 fixlen -= out->bmv_offset;
5438 if (prealloced && out->bmv_offset + out->bmv_length == end) {
5439 /* Came to hole at EOF. Trim it. */
5440 if (fixlen <= 0)
5441 return 0;
5442 out->bmv_length = fixlen;
5443 }
5444 } else {
5445 if (startblock == DELAYSTARTBLOCK)
5446 out->bmv_block = -2;
5447 else
5448 out->bmv_block = xfs_fsb_to_db(ip, startblock);
5449 fileblock = XFS_BB_TO_FSB(ip->i_mount, out->bmv_offset);
5450 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
5451 if (xfs_iext_bno_to_ext(ifp, fileblock, &lastx) &&
5452 (lastx == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))-1))
5453 out->bmv_oflags |= BMV_OF_LAST;
5454 }
5455
5456 return 1;
5457 }
5458
5459 /*
5460 * Get inode's extents as described in bmv, and format for output.
5461 * Calls formatter to fill the user's buffer until all extents
5462 * are mapped, until the passed-in bmv->bmv_count slots have
5463 * been filled, or until the formatter short-circuits the loop,
5464 * if it is tracking filled-in extents on its own.
5465 */
5466 int /* error code */
xfs_getbmap(xfs_inode_t * ip,struct getbmapx * bmv,xfs_bmap_format_t formatter,void * arg)5467 xfs_getbmap(
5468 xfs_inode_t *ip,
5469 struct getbmapx *bmv, /* user bmap structure */
5470 xfs_bmap_format_t formatter, /* format to user */
5471 void *arg) /* formatter arg */
5472 {
5473 __int64_t bmvend; /* last block requested */
5474 int error = 0; /* return value */
5475 __int64_t fixlen; /* length for -1 case */
5476 int i; /* extent number */
5477 int lock; /* lock state */
5478 xfs_bmbt_irec_t *map; /* buffer for user's data */
5479 xfs_mount_t *mp; /* file system mount point */
5480 int nex; /* # of user extents can do */
5481 int nexleft; /* # of user extents left */
5482 int subnex; /* # of bmapi's can do */
5483 int nmap; /* number of map entries */
5484 struct getbmapx *out; /* output structure */
5485 int whichfork; /* data or attr fork */
5486 int prealloced; /* this is a file with
5487 * preallocated data space */
5488 int iflags; /* interface flags */
5489 int bmapi_flags; /* flags for xfs_bmapi */
5490 int cur_ext = 0;
5491
5492 mp = ip->i_mount;
5493 iflags = bmv->bmv_iflags;
5494 whichfork = iflags & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK;
5495
5496 if (whichfork == XFS_ATTR_FORK) {
5497 if (XFS_IFORK_Q(ip)) {
5498 if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS &&
5499 ip->i_d.di_aformat != XFS_DINODE_FMT_BTREE &&
5500 ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)
5501 return XFS_ERROR(EINVAL);
5502 } else if (unlikely(
5503 ip->i_d.di_aformat != 0 &&
5504 ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS)) {
5505 XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW,
5506 ip->i_mount);
5507 return XFS_ERROR(EFSCORRUPTED);
5508 }
5509
5510 prealloced = 0;
5511 fixlen = 1LL << 32;
5512 } else {
5513 if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS &&
5514 ip->i_d.di_format != XFS_DINODE_FMT_BTREE &&
5515 ip->i_d.di_format != XFS_DINODE_FMT_LOCAL)
5516 return XFS_ERROR(EINVAL);
5517
5518 if (xfs_get_extsz_hint(ip) ||
5519 ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)){
5520 prealloced = 1;
5521 fixlen = XFS_MAXIOFFSET(mp);
5522 } else {
5523 prealloced = 0;
5524 fixlen = XFS_ISIZE(ip);
5525 }
5526 }
5527
5528 if (bmv->bmv_length == -1) {
5529 fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, fixlen));
5530 bmv->bmv_length =
5531 max_t(__int64_t, fixlen - bmv->bmv_offset, 0);
5532 } else if (bmv->bmv_length == 0) {
5533 bmv->bmv_entries = 0;
5534 return 0;
5535 } else if (bmv->bmv_length < 0) {
5536 return XFS_ERROR(EINVAL);
5537 }
5538
5539 nex = bmv->bmv_count - 1;
5540 if (nex <= 0)
5541 return XFS_ERROR(EINVAL);
5542 bmvend = bmv->bmv_offset + bmv->bmv_length;
5543
5544
5545 if (bmv->bmv_count > ULONG_MAX / sizeof(struct getbmapx))
5546 return XFS_ERROR(ENOMEM);
5547 out = kmem_zalloc(bmv->bmv_count * sizeof(struct getbmapx), KM_MAYFAIL);
5548 if (!out) {
5549 out = kmem_zalloc_large(bmv->bmv_count *
5550 sizeof(struct getbmapx));
5551 if (!out)
5552 return XFS_ERROR(ENOMEM);
5553 }
5554
5555 xfs_ilock(ip, XFS_IOLOCK_SHARED);
5556 if (whichfork == XFS_DATA_FORK && !(iflags & BMV_IF_DELALLOC)) {
5557 if (ip->i_delayed_blks || XFS_ISIZE(ip) > ip->i_d.di_size) {
5558 error = xfs_flush_pages(ip, 0, -1, 0, FI_REMAPF);
5559 if (error)
5560 goto out_unlock_iolock;
5561 }
5562 /*
5563 * even after flushing the inode, there can still be delalloc
5564 * blocks on the inode beyond EOF due to speculative
5565 * preallocation. These are not removed until the release
5566 * function is called or the inode is inactivated. Hence we
5567 * cannot assert here that ip->i_delayed_blks == 0.
5568 */
5569 }
5570
5571 lock = xfs_ilock_map_shared(ip);
5572
5573 /*
5574 * Don't let nex be bigger than the number of extents
5575 * we can have assuming alternating holes and real extents.
5576 */
5577 if (nex > XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1)
5578 nex = XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1;
5579
5580 bmapi_flags = xfs_bmapi_aflag(whichfork);
5581 if (!(iflags & BMV_IF_PREALLOC))
5582 bmapi_flags |= XFS_BMAPI_IGSTATE;
5583
5584 /*
5585 * Allocate enough space to handle "subnex" maps at a time.
5586 */
5587 error = ENOMEM;
5588 subnex = 16;
5589 map = kmem_alloc(subnex * sizeof(*map), KM_MAYFAIL | KM_NOFS);
5590 if (!map)
5591 goto out_unlock_ilock;
5592
5593 bmv->bmv_entries = 0;
5594
5595 if (XFS_IFORK_NEXTENTS(ip, whichfork) == 0 &&
5596 (whichfork == XFS_ATTR_FORK || !(iflags & BMV_IF_DELALLOC))) {
5597 error = 0;
5598 goto out_free_map;
5599 }
5600
5601 nexleft = nex;
5602
5603 do {
5604 nmap = (nexleft > subnex) ? subnex : nexleft;
5605 error = xfs_bmapi_read(ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset),
5606 XFS_BB_TO_FSB(mp, bmv->bmv_length),
5607 map, &nmap, bmapi_flags);
5608 if (error)
5609 goto out_free_map;
5610 ASSERT(nmap <= subnex);
5611
5612 for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) {
5613 out[cur_ext].bmv_oflags = 0;
5614 if (map[i].br_state == XFS_EXT_UNWRITTEN)
5615 out[cur_ext].bmv_oflags |= BMV_OF_PREALLOC;
5616 else if (map[i].br_startblock == DELAYSTARTBLOCK)
5617 out[cur_ext].bmv_oflags |= BMV_OF_DELALLOC;
5618 out[cur_ext].bmv_offset =
5619 XFS_FSB_TO_BB(mp, map[i].br_startoff);
5620 out[cur_ext].bmv_length =
5621 XFS_FSB_TO_BB(mp, map[i].br_blockcount);
5622 out[cur_ext].bmv_unused1 = 0;
5623 out[cur_ext].bmv_unused2 = 0;
5624 ASSERT(((iflags & BMV_IF_DELALLOC) != 0) ||
5625 (map[i].br_startblock != DELAYSTARTBLOCK));
5626 if (map[i].br_startblock == HOLESTARTBLOCK &&
5627 whichfork == XFS_ATTR_FORK) {
5628 /* came to the end of attribute fork */
5629 out[cur_ext].bmv_oflags |= BMV_OF_LAST;
5630 goto out_free_map;
5631 }
5632
5633 if (!xfs_getbmapx_fix_eof_hole(ip, &out[cur_ext],
5634 prealloced, bmvend,
5635 map[i].br_startblock))
5636 goto out_free_map;
5637
5638 bmv->bmv_offset =
5639 out[cur_ext].bmv_offset +
5640 out[cur_ext].bmv_length;
5641 bmv->bmv_length =
5642 max_t(__int64_t, 0, bmvend - bmv->bmv_offset);
5643
5644 /*
5645 * In case we don't want to return the hole,
5646 * don't increase cur_ext so that we can reuse
5647 * it in the next loop.
5648 */
5649 if ((iflags & BMV_IF_NO_HOLES) &&
5650 map[i].br_startblock == HOLESTARTBLOCK) {
5651 memset(&out[cur_ext], 0, sizeof(out[cur_ext]));
5652 continue;
5653 }
5654
5655 nexleft--;
5656 bmv->bmv_entries++;
5657 cur_ext++;
5658 }
5659 } while (nmap && nexleft && bmv->bmv_length);
5660
5661 out_free_map:
5662 kmem_free(map);
5663 out_unlock_ilock:
5664 xfs_iunlock_map_shared(ip, lock);
5665 out_unlock_iolock:
5666 xfs_iunlock(ip, XFS_IOLOCK_SHARED);
5667
5668 for (i = 0; i < cur_ext; i++) {
5669 int full = 0; /* user array is full */
5670
5671 /* format results & advance arg */
5672 error = formatter(&arg, &out[i], &full);
5673 if (error || full)
5674 break;
5675 }
5676
5677 if (is_vmalloc_addr(out))
5678 kmem_free_large(out);
5679 else
5680 kmem_free(out);
5681 return error;
5682 }
5683
5684 #ifdef DEBUG
5685 STATIC struct xfs_buf *
xfs_bmap_get_bp(struct xfs_btree_cur * cur,xfs_fsblock_t bno)5686 xfs_bmap_get_bp(
5687 struct xfs_btree_cur *cur,
5688 xfs_fsblock_t bno)
5689 {
5690 struct xfs_log_item_desc *lidp;
5691 int i;
5692
5693 if (!cur)
5694 return NULL;
5695
5696 for (i = 0; i < XFS_BTREE_MAXLEVELS; i++) {
5697 if (!cur->bc_bufs[i])
5698 break;
5699 if (XFS_BUF_ADDR(cur->bc_bufs[i]) == bno)
5700 return cur->bc_bufs[i];
5701 }
5702
5703 /* Chase down all the log items to see if the bp is there */
5704 list_for_each_entry(lidp, &cur->bc_tp->t_items, lid_trans) {
5705 struct xfs_buf_log_item *bip;
5706 bip = (struct xfs_buf_log_item *)lidp->lid_item;
5707 if (bip->bli_item.li_type == XFS_LI_BUF &&
5708 XFS_BUF_ADDR(bip->bli_buf) == bno)
5709 return bip->bli_buf;
5710 }
5711
5712 return NULL;
5713 }
5714
5715 STATIC void
xfs_check_block(struct xfs_btree_block * block,xfs_mount_t * mp,int root,short sz)5716 xfs_check_block(
5717 struct xfs_btree_block *block,
5718 xfs_mount_t *mp,
5719 int root,
5720 short sz)
5721 {
5722 int i, j, dmxr;
5723 __be64 *pp, *thispa; /* pointer to block address */
5724 xfs_bmbt_key_t *prevp, *keyp;
5725
5726 ASSERT(be16_to_cpu(block->bb_level) > 0);
5727
5728 prevp = NULL;
5729 for( i = 1; i <= xfs_btree_get_numrecs(block); i++) {
5730 dmxr = mp->m_bmap_dmxr[0];
5731 keyp = XFS_BMBT_KEY_ADDR(mp, block, i);
5732
5733 if (prevp) {
5734 ASSERT(be64_to_cpu(prevp->br_startoff) <
5735 be64_to_cpu(keyp->br_startoff));
5736 }
5737 prevp = keyp;
5738
5739 /*
5740 * Compare the block numbers to see if there are dups.
5741 */
5742 if (root)
5743 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, i, sz);
5744 else
5745 pp = XFS_BMBT_PTR_ADDR(mp, block, i, dmxr);
5746
5747 for (j = i+1; j <= be16_to_cpu(block->bb_numrecs); j++) {
5748 if (root)
5749 thispa = XFS_BMAP_BROOT_PTR_ADDR(mp, block, j, sz);
5750 else
5751 thispa = XFS_BMBT_PTR_ADDR(mp, block, j, dmxr);
5752 if (*thispa == *pp) {
5753 xfs_warn(mp, "%s: thispa(%d) == pp(%d) %Ld",
5754 __func__, j, i,
5755 (unsigned long long)be64_to_cpu(*thispa));
5756 panic("%s: ptrs are equal in node\n",
5757 __func__);
5758 }
5759 }
5760 }
5761 }
5762
5763 /*
5764 * Check that the extents for the inode ip are in the right order in all
5765 * btree leaves.
5766 */
5767
5768 STATIC void
xfs_bmap_check_leaf_extents(xfs_btree_cur_t * cur,xfs_inode_t * ip,int whichfork)5769 xfs_bmap_check_leaf_extents(
5770 xfs_btree_cur_t *cur, /* btree cursor or null */
5771 xfs_inode_t *ip, /* incore inode pointer */
5772 int whichfork) /* data or attr fork */
5773 {
5774 struct xfs_btree_block *block; /* current btree block */
5775 xfs_fsblock_t bno; /* block # of "block" */
5776 xfs_buf_t *bp; /* buffer for "block" */
5777 int error; /* error return value */
5778 xfs_extnum_t i=0, j; /* index into the extents list */
5779 xfs_ifork_t *ifp; /* fork structure */
5780 int level; /* btree level, for checking */
5781 xfs_mount_t *mp; /* file system mount structure */
5782 __be64 *pp; /* pointer to block address */
5783 xfs_bmbt_rec_t *ep; /* pointer to current extent */
5784 xfs_bmbt_rec_t last = {0, 0}; /* last extent in prev block */
5785 xfs_bmbt_rec_t *nextp; /* pointer to next extent */
5786 int bp_release = 0;
5787
5788 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE) {
5789 return;
5790 }
5791
5792 bno = NULLFSBLOCK;
5793 mp = ip->i_mount;
5794 ifp = XFS_IFORK_PTR(ip, whichfork);
5795 block = ifp->if_broot;
5796 /*
5797 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
5798 */
5799 level = be16_to_cpu(block->bb_level);
5800 ASSERT(level > 0);
5801 xfs_check_block(block, mp, 1, ifp->if_broot_bytes);
5802 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
5803 bno = be64_to_cpu(*pp);
5804
5805 ASSERT(bno != NULLDFSBNO);
5806 ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
5807 ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
5808
5809 /*
5810 * Go down the tree until leaf level is reached, following the first
5811 * pointer (leftmost) at each level.
5812 */
5813 while (level-- > 0) {
5814 /* See if buf is in cur first */
5815 bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
5816 if (bp) {
5817 bp_release = 0;
5818 } else {
5819 bp_release = 1;
5820 }
5821 if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
5822 XFS_BMAP_BTREE_REF)))
5823 goto error_norelse;
5824 block = XFS_BUF_TO_BLOCK(bp);
5825 XFS_WANT_CORRUPTED_GOTO(
5826 xfs_bmap_sanity_check(mp, bp, level),
5827 error0);
5828 if (level == 0)
5829 break;
5830
5831 /*
5832 * Check this block for basic sanity (increasing keys and
5833 * no duplicate blocks).
5834 */
5835
5836 xfs_check_block(block, mp, 0, 0);
5837 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
5838 bno = be64_to_cpu(*pp);
5839 XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, bno), error0);
5840 if (bp_release) {
5841 bp_release = 0;
5842 xfs_trans_brelse(NULL, bp);
5843 }
5844 }
5845
5846 /*
5847 * Here with bp and block set to the leftmost leaf node in the tree.
5848 */
5849 i = 0;
5850
5851 /*
5852 * Loop over all leaf nodes checking that all extents are in the right order.
5853 */
5854 for (;;) {
5855 xfs_fsblock_t nextbno;
5856 xfs_extnum_t num_recs;
5857
5858
5859 num_recs = xfs_btree_get_numrecs(block);
5860
5861 /*
5862 * Read-ahead the next leaf block, if any.
5863 */
5864
5865 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
5866
5867 /*
5868 * Check all the extents to make sure they are OK.
5869 * If we had a previous block, the last entry should
5870 * conform with the first entry in this one.
5871 */
5872
5873 ep = XFS_BMBT_REC_ADDR(mp, block, 1);
5874 if (i) {
5875 ASSERT(xfs_bmbt_disk_get_startoff(&last) +
5876 xfs_bmbt_disk_get_blockcount(&last) <=
5877 xfs_bmbt_disk_get_startoff(ep));
5878 }
5879 for (j = 1; j < num_recs; j++) {
5880 nextp = XFS_BMBT_REC_ADDR(mp, block, j + 1);
5881 ASSERT(xfs_bmbt_disk_get_startoff(ep) +
5882 xfs_bmbt_disk_get_blockcount(ep) <=
5883 xfs_bmbt_disk_get_startoff(nextp));
5884 ep = nextp;
5885 }
5886
5887 last = *ep;
5888 i += num_recs;
5889 if (bp_release) {
5890 bp_release = 0;
5891 xfs_trans_brelse(NULL, bp);
5892 }
5893 bno = nextbno;
5894 /*
5895 * If we've reached the end, stop.
5896 */
5897 if (bno == NULLFSBLOCK)
5898 break;
5899
5900 bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
5901 if (bp) {
5902 bp_release = 0;
5903 } else {
5904 bp_release = 1;
5905 }
5906 if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
5907 XFS_BMAP_BTREE_REF)))
5908 goto error_norelse;
5909 block = XFS_BUF_TO_BLOCK(bp);
5910 }
5911 if (bp_release) {
5912 bp_release = 0;
5913 xfs_trans_brelse(NULL, bp);
5914 }
5915 return;
5916
5917 error0:
5918 xfs_warn(mp, "%s: at error0", __func__);
5919 if (bp_release)
5920 xfs_trans_brelse(NULL, bp);
5921 error_norelse:
5922 xfs_warn(mp, "%s: BAD after btree leaves for %d extents",
5923 __func__, i);
5924 panic("%s: CORRUPTED BTREE OR SOMETHING", __func__);
5925 return;
5926 }
5927 #endif
5928
5929 /*
5930 * Count fsblocks of the given fork.
5931 */
5932 int /* error */
xfs_bmap_count_blocks(xfs_trans_t * tp,xfs_inode_t * ip,int whichfork,int * count)5933 xfs_bmap_count_blocks(
5934 xfs_trans_t *tp, /* transaction pointer */
5935 xfs_inode_t *ip, /* incore inode */
5936 int whichfork, /* data or attr fork */
5937 int *count) /* out: count of blocks */
5938 {
5939 struct xfs_btree_block *block; /* current btree block */
5940 xfs_fsblock_t bno; /* block # of "block" */
5941 xfs_ifork_t *ifp; /* fork structure */
5942 int level; /* btree level, for checking */
5943 xfs_mount_t *mp; /* file system mount structure */
5944 __be64 *pp; /* pointer to block address */
5945
5946 bno = NULLFSBLOCK;
5947 mp = ip->i_mount;
5948 ifp = XFS_IFORK_PTR(ip, whichfork);
5949 if ( XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ) {
5950 xfs_bmap_count_leaves(ifp, 0,
5951 ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t),
5952 count);
5953 return 0;
5954 }
5955
5956 /*
5957 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
5958 */
5959 block = ifp->if_broot;
5960 level = be16_to_cpu(block->bb_level);
5961 ASSERT(level > 0);
5962 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
5963 bno = be64_to_cpu(*pp);
5964 ASSERT(bno != NULLDFSBNO);
5965 ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
5966 ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
5967
5968 if (unlikely(xfs_bmap_count_tree(mp, tp, ifp, bno, level, count) < 0)) {
5969 XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", XFS_ERRLEVEL_LOW,
5970 mp);
5971 return XFS_ERROR(EFSCORRUPTED);
5972 }
5973
5974 return 0;
5975 }
5976
5977 /*
5978 * Recursively walks each level of a btree
5979 * to count total fsblocks is use.
5980 */
5981 STATIC int /* error */
xfs_bmap_count_tree(xfs_mount_t * mp,xfs_trans_t * tp,xfs_ifork_t * ifp,xfs_fsblock_t blockno,int levelin,int * count)5982 xfs_bmap_count_tree(
5983 xfs_mount_t *mp, /* file system mount point */
5984 xfs_trans_t *tp, /* transaction pointer */
5985 xfs_ifork_t *ifp, /* inode fork pointer */
5986 xfs_fsblock_t blockno, /* file system block number */
5987 int levelin, /* level in btree */
5988 int *count) /* Count of blocks */
5989 {
5990 int error;
5991 xfs_buf_t *bp, *nbp;
5992 int level = levelin;
5993 __be64 *pp;
5994 xfs_fsblock_t bno = blockno;
5995 xfs_fsblock_t nextbno;
5996 struct xfs_btree_block *block, *nextblock;
5997 int numrecs;
5998
5999 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, XFS_BMAP_BTREE_REF)))
6000 return error;
6001 *count += 1;
6002 block = XFS_BUF_TO_BLOCK(bp);
6003
6004 if (--level) {
6005 /* Not at node above leaves, count this level of nodes */
6006 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
6007 while (nextbno != NULLFSBLOCK) {
6008 if ((error = xfs_btree_read_bufl(mp, tp, nextbno,
6009 0, &nbp, XFS_BMAP_BTREE_REF)))
6010 return error;
6011 *count += 1;
6012 nextblock = XFS_BUF_TO_BLOCK(nbp);
6013 nextbno = be64_to_cpu(nextblock->bb_u.l.bb_rightsib);
6014 xfs_trans_brelse(tp, nbp);
6015 }
6016
6017 /* Dive to the next level */
6018 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
6019 bno = be64_to_cpu(*pp);
6020 if (unlikely((error =
6021 xfs_bmap_count_tree(mp, tp, ifp, bno, level, count)) < 0)) {
6022 xfs_trans_brelse(tp, bp);
6023 XFS_ERROR_REPORT("xfs_bmap_count_tree(1)",
6024 XFS_ERRLEVEL_LOW, mp);
6025 return XFS_ERROR(EFSCORRUPTED);
6026 }
6027 xfs_trans_brelse(tp, bp);
6028 } else {
6029 /* count all level 1 nodes and their leaves */
6030 for (;;) {
6031 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
6032 numrecs = be16_to_cpu(block->bb_numrecs);
6033 xfs_bmap_disk_count_leaves(mp, block, numrecs, count);
6034 xfs_trans_brelse(tp, bp);
6035 if (nextbno == NULLFSBLOCK)
6036 break;
6037 bno = nextbno;
6038 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
6039 XFS_BMAP_BTREE_REF)))
6040 return error;
6041 *count += 1;
6042 block = XFS_BUF_TO_BLOCK(bp);
6043 }
6044 }
6045 return 0;
6046 }
6047
6048 /*
6049 * Count leaf blocks given a range of extent records.
6050 */
6051 STATIC void
xfs_bmap_count_leaves(xfs_ifork_t * ifp,xfs_extnum_t idx,int numrecs,int * count)6052 xfs_bmap_count_leaves(
6053 xfs_ifork_t *ifp,
6054 xfs_extnum_t idx,
6055 int numrecs,
6056 int *count)
6057 {
6058 int b;
6059
6060 for (b = 0; b < numrecs; b++) {
6061 xfs_bmbt_rec_host_t *frp = xfs_iext_get_ext(ifp, idx + b);
6062 *count += xfs_bmbt_get_blockcount(frp);
6063 }
6064 }
6065
6066 /*
6067 * Count leaf blocks given a range of extent records originally
6068 * in btree format.
6069 */
6070 STATIC void
xfs_bmap_disk_count_leaves(struct xfs_mount * mp,struct xfs_btree_block * block,int numrecs,int * count)6071 xfs_bmap_disk_count_leaves(
6072 struct xfs_mount *mp,
6073 struct xfs_btree_block *block,
6074 int numrecs,
6075 int *count)
6076 {
6077 int b;
6078 xfs_bmbt_rec_t *frp;
6079
6080 for (b = 1; b <= numrecs; b++) {
6081 frp = XFS_BMBT_REC_ADDR(mp, block, b);
6082 *count += xfs_bmbt_disk_get_blockcount(frp);
6083 }
6084 }
6085
6086 /*
6087 * dead simple method of punching delalyed allocation blocks from a range in
6088 * the inode. Walks a block at a time so will be slow, but is only executed in
6089 * rare error cases so the overhead is not critical. This will alays punch out
6090 * both the start and end blocks, even if the ranges only partially overlap
6091 * them, so it is up to the caller to ensure that partial blocks are not
6092 * passed in.
6093 */
6094 int
xfs_bmap_punch_delalloc_range(struct xfs_inode * ip,xfs_fileoff_t start_fsb,xfs_fileoff_t length)6095 xfs_bmap_punch_delalloc_range(
6096 struct xfs_inode *ip,
6097 xfs_fileoff_t start_fsb,
6098 xfs_fileoff_t length)
6099 {
6100 xfs_fileoff_t remaining = length;
6101 int error = 0;
6102
6103 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
6104
6105 do {
6106 int done;
6107 xfs_bmbt_irec_t imap;
6108 int nimaps = 1;
6109 xfs_fsblock_t firstblock;
6110 xfs_bmap_free_t flist;
6111
6112 /*
6113 * Map the range first and check that it is a delalloc extent
6114 * before trying to unmap the range. Otherwise we will be
6115 * trying to remove a real extent (which requires a
6116 * transaction) or a hole, which is probably a bad idea...
6117 */
6118 error = xfs_bmapi_read(ip, start_fsb, 1, &imap, &nimaps,
6119 XFS_BMAPI_ENTIRE);
6120
6121 if (error) {
6122 /* something screwed, just bail */
6123 if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
6124 xfs_alert(ip->i_mount,
6125 "Failed delalloc mapping lookup ino %lld fsb %lld.",
6126 ip->i_ino, start_fsb);
6127 }
6128 break;
6129 }
6130 if (!nimaps) {
6131 /* nothing there */
6132 goto next_block;
6133 }
6134 if (imap.br_startblock != DELAYSTARTBLOCK) {
6135 /* been converted, ignore */
6136 goto next_block;
6137 }
6138 WARN_ON(imap.br_blockcount == 0);
6139
6140 /*
6141 * Note: while we initialise the firstblock/flist pair, they
6142 * should never be used because blocks should never be
6143 * allocated or freed for a delalloc extent and hence we need
6144 * don't cancel or finish them after the xfs_bunmapi() call.
6145 */
6146 xfs_bmap_init(&flist, &firstblock);
6147 error = xfs_bunmapi(NULL, ip, start_fsb, 1, 0, 1, &firstblock,
6148 &flist, &done);
6149 if (error)
6150 break;
6151
6152 ASSERT(!flist.xbf_count && !flist.xbf_first);
6153 next_block:
6154 start_fsb++;
6155 remaining--;
6156 } while(remaining > 0);
6157
6158 return error;
6159 }
6160