1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6
7 #include "xfs.h"
8 #include "xfs_fs.h"
9 #include "xfs_shared.h"
10 #include "xfs_format.h"
11 #include "xfs_log_format.h"
12 #include "xfs_trans_resv.h"
13 #include "xfs_mount.h"
14 #include "xfs_inode.h"
15 #include "xfs_trans.h"
16 #include "xfs_inode_item.h"
17 #include "xfs_btree.h"
18 #include "xfs_bmap_btree.h"
19 #include "xfs_bmap.h"
20 #include "xfs_error.h"
21 #include "xfs_trace.h"
22 #include "xfs_da_format.h"
23 #include "xfs_da_btree.h"
24 #include "xfs_dir2_priv.h"
25 #include "xfs_attr_leaf.h"
26 #include "xfs_types.h"
27 #include "xfs_errortag.h"
28
29 struct kmem_cache *xfs_ifork_cache;
30
31 void
xfs_init_local_fork(struct xfs_inode * ip,int whichfork,const void * data,int64_t size)32 xfs_init_local_fork(
33 struct xfs_inode *ip,
34 int whichfork,
35 const void *data,
36 int64_t size)
37 {
38 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
39 int mem_size = size;
40 bool zero_terminate;
41
42 /*
43 * If we are using the local fork to store a symlink body we need to
44 * zero-terminate it so that we can pass it back to the VFS directly.
45 * Overallocate the in-memory fork by one for that and add a zero
46 * to terminate it below.
47 */
48 zero_terminate = S_ISLNK(VFS_I(ip)->i_mode);
49 if (zero_terminate)
50 mem_size++;
51
52 if (size) {
53 ifp->if_u1.if_data = kmem_alloc(mem_size, KM_NOFS);
54 memcpy(ifp->if_u1.if_data, data, size);
55 if (zero_terminate)
56 ifp->if_u1.if_data[size] = '\0';
57 } else {
58 ifp->if_u1.if_data = NULL;
59 }
60
61 ifp->if_bytes = size;
62 }
63
64 /*
65 * The file is in-lined in the on-disk inode.
66 */
67 STATIC int
xfs_iformat_local(struct xfs_inode * ip,struct xfs_dinode * dip,int whichfork,int size)68 xfs_iformat_local(
69 struct xfs_inode *ip,
70 struct xfs_dinode *dip,
71 int whichfork,
72 int size)
73 {
74 /*
75 * If the size is unreasonable, then something
76 * is wrong and we just bail out rather than crash in
77 * kmem_alloc() or memcpy() below.
78 */
79 if (unlikely(size > XFS_DFORK_SIZE(dip, ip->i_mount, whichfork))) {
80 xfs_warn(ip->i_mount,
81 "corrupt inode %Lu (bad size %d for local fork, size = %zd).",
82 (unsigned long long) ip->i_ino, size,
83 XFS_DFORK_SIZE(dip, ip->i_mount, whichfork));
84 xfs_inode_verifier_error(ip, -EFSCORRUPTED,
85 "xfs_iformat_local", dip, sizeof(*dip),
86 __this_address);
87 return -EFSCORRUPTED;
88 }
89
90 xfs_init_local_fork(ip, whichfork, XFS_DFORK_PTR(dip, whichfork), size);
91 return 0;
92 }
93
94 /*
95 * The file consists of a set of extents all of which fit into the on-disk
96 * inode.
97 */
98 STATIC int
xfs_iformat_extents(struct xfs_inode * ip,struct xfs_dinode * dip,int whichfork)99 xfs_iformat_extents(
100 struct xfs_inode *ip,
101 struct xfs_dinode *dip,
102 int whichfork)
103 {
104 struct xfs_mount *mp = ip->i_mount;
105 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
106 int state = xfs_bmap_fork_to_state(whichfork);
107 xfs_extnum_t nex = xfs_dfork_nextents(dip, whichfork);
108 int size = nex * sizeof(xfs_bmbt_rec_t);
109 struct xfs_iext_cursor icur;
110 struct xfs_bmbt_rec *dp;
111 struct xfs_bmbt_irec new;
112 int i;
113
114 /*
115 * If the number of extents is unreasonable, then something is wrong and
116 * we just bail out rather than crash in kmem_alloc() or memcpy() below.
117 */
118 if (unlikely(size < 0 || size > XFS_DFORK_SIZE(dip, mp, whichfork))) {
119 xfs_warn(ip->i_mount, "corrupt inode %llu ((a)extents = %llu).",
120 ip->i_ino, nex);
121 xfs_inode_verifier_error(ip, -EFSCORRUPTED,
122 "xfs_iformat_extents(1)", dip, sizeof(*dip),
123 __this_address);
124 return -EFSCORRUPTED;
125 }
126
127 ifp->if_bytes = 0;
128 ifp->if_u1.if_root = NULL;
129 ifp->if_height = 0;
130 if (size) {
131 dp = (xfs_bmbt_rec_t *) XFS_DFORK_PTR(dip, whichfork);
132
133 xfs_iext_first(ifp, &icur);
134 for (i = 0; i < nex; i++, dp++) {
135 xfs_failaddr_t fa;
136
137 xfs_bmbt_disk_get_all(dp, &new);
138 fa = xfs_bmap_validate_extent(ip, whichfork, &new);
139 if (fa) {
140 xfs_inode_verifier_error(ip, -EFSCORRUPTED,
141 "xfs_iformat_extents(2)",
142 dp, sizeof(*dp), fa);
143 return -EFSCORRUPTED;
144 }
145
146 xfs_iext_insert(ip, &icur, &new, state);
147 trace_xfs_read_extent(ip, &icur, state, _THIS_IP_);
148 xfs_iext_next(ifp, &icur);
149 }
150 }
151 return 0;
152 }
153
154 /*
155 * The file has too many extents to fit into
156 * the inode, so they are in B-tree format.
157 * Allocate a buffer for the root of the B-tree
158 * and copy the root into it. The i_extents
159 * field will remain NULL until all of the
160 * extents are read in (when they are needed).
161 */
162 STATIC int
xfs_iformat_btree(struct xfs_inode * ip,struct xfs_dinode * dip,int whichfork)163 xfs_iformat_btree(
164 struct xfs_inode *ip,
165 struct xfs_dinode *dip,
166 int whichfork)
167 {
168 struct xfs_mount *mp = ip->i_mount;
169 xfs_bmdr_block_t *dfp;
170 struct xfs_ifork *ifp;
171 /* REFERENCED */
172 int nrecs;
173 int size;
174 int level;
175
176 ifp = XFS_IFORK_PTR(ip, whichfork);
177 dfp = (xfs_bmdr_block_t *)XFS_DFORK_PTR(dip, whichfork);
178 size = XFS_BMAP_BROOT_SPACE(mp, dfp);
179 nrecs = be16_to_cpu(dfp->bb_numrecs);
180 level = be16_to_cpu(dfp->bb_level);
181
182 /*
183 * blow out if -- fork has less extents than can fit in
184 * fork (fork shouldn't be a btree format), root btree
185 * block has more records than can fit into the fork,
186 * or the number of extents is greater than the number of
187 * blocks.
188 */
189 if (unlikely(ifp->if_nextents <= XFS_IFORK_MAXEXT(ip, whichfork) ||
190 nrecs == 0 ||
191 XFS_BMDR_SPACE_CALC(nrecs) >
192 XFS_DFORK_SIZE(dip, mp, whichfork) ||
193 ifp->if_nextents > ip->i_nblocks) ||
194 level == 0 || level > XFS_BM_MAXLEVELS(mp, whichfork)) {
195 xfs_warn(mp, "corrupt inode %Lu (btree).",
196 (unsigned long long) ip->i_ino);
197 xfs_inode_verifier_error(ip, -EFSCORRUPTED,
198 "xfs_iformat_btree", dfp, size,
199 __this_address);
200 return -EFSCORRUPTED;
201 }
202
203 ifp->if_broot_bytes = size;
204 ifp->if_broot = kmem_alloc(size, KM_NOFS);
205 ASSERT(ifp->if_broot != NULL);
206 /*
207 * Copy and convert from the on-disk structure
208 * to the in-memory structure.
209 */
210 xfs_bmdr_to_bmbt(ip, dfp, XFS_DFORK_SIZE(dip, ip->i_mount, whichfork),
211 ifp->if_broot, size);
212
213 ifp->if_bytes = 0;
214 ifp->if_u1.if_root = NULL;
215 ifp->if_height = 0;
216 return 0;
217 }
218
219 int
xfs_iformat_data_fork(struct xfs_inode * ip,struct xfs_dinode * dip)220 xfs_iformat_data_fork(
221 struct xfs_inode *ip,
222 struct xfs_dinode *dip)
223 {
224 struct inode *inode = VFS_I(ip);
225 int error;
226
227 /*
228 * Initialize the extent count early, as the per-format routines may
229 * depend on it.
230 */
231 ip->i_df.if_format = dip->di_format;
232 ip->i_df.if_nextents = xfs_dfork_data_extents(dip);
233
234 switch (inode->i_mode & S_IFMT) {
235 case S_IFIFO:
236 case S_IFCHR:
237 case S_IFBLK:
238 case S_IFSOCK:
239 ip->i_disk_size = 0;
240 inode->i_rdev = xfs_to_linux_dev_t(xfs_dinode_get_rdev(dip));
241 return 0;
242 case S_IFREG:
243 case S_IFLNK:
244 case S_IFDIR:
245 switch (ip->i_df.if_format) {
246 case XFS_DINODE_FMT_LOCAL:
247 error = xfs_iformat_local(ip, dip, XFS_DATA_FORK,
248 be64_to_cpu(dip->di_size));
249 if (!error)
250 error = xfs_ifork_verify_local_data(ip);
251 return error;
252 case XFS_DINODE_FMT_EXTENTS:
253 return xfs_iformat_extents(ip, dip, XFS_DATA_FORK);
254 case XFS_DINODE_FMT_BTREE:
255 return xfs_iformat_btree(ip, dip, XFS_DATA_FORK);
256 default:
257 xfs_inode_verifier_error(ip, -EFSCORRUPTED, __func__,
258 dip, sizeof(*dip), __this_address);
259 return -EFSCORRUPTED;
260 }
261 break;
262 default:
263 xfs_inode_verifier_error(ip, -EFSCORRUPTED, __func__, dip,
264 sizeof(*dip), __this_address);
265 return -EFSCORRUPTED;
266 }
267 }
268
269 static uint16_t
xfs_dfork_attr_shortform_size(struct xfs_dinode * dip)270 xfs_dfork_attr_shortform_size(
271 struct xfs_dinode *dip)
272 {
273 struct xfs_attr_shortform *atp =
274 (struct xfs_attr_shortform *)XFS_DFORK_APTR(dip);
275
276 return be16_to_cpu(atp->hdr.totsize);
277 }
278
279 struct xfs_ifork *
xfs_ifork_alloc(enum xfs_dinode_fmt format,xfs_extnum_t nextents)280 xfs_ifork_alloc(
281 enum xfs_dinode_fmt format,
282 xfs_extnum_t nextents)
283 {
284 struct xfs_ifork *ifp;
285
286 ifp = kmem_cache_zalloc(xfs_ifork_cache, GFP_NOFS | __GFP_NOFAIL);
287 ifp->if_format = format;
288 ifp->if_nextents = nextents;
289 return ifp;
290 }
291
292 int
xfs_iformat_attr_fork(struct xfs_inode * ip,struct xfs_dinode * dip)293 xfs_iformat_attr_fork(
294 struct xfs_inode *ip,
295 struct xfs_dinode *dip)
296 {
297 xfs_extnum_t naextents = xfs_dfork_attr_extents(dip);
298 int error = 0;
299
300 /*
301 * Initialize the extent count early, as the per-format routines may
302 * depend on it.
303 */
304 ip->i_afp = xfs_ifork_alloc(dip->di_aformat, naextents);
305
306 switch (ip->i_afp->if_format) {
307 case XFS_DINODE_FMT_LOCAL:
308 error = xfs_iformat_local(ip, dip, XFS_ATTR_FORK,
309 xfs_dfork_attr_shortform_size(dip));
310 if (!error)
311 error = xfs_ifork_verify_local_attr(ip);
312 break;
313 case XFS_DINODE_FMT_EXTENTS:
314 error = xfs_iformat_extents(ip, dip, XFS_ATTR_FORK);
315 break;
316 case XFS_DINODE_FMT_BTREE:
317 error = xfs_iformat_btree(ip, dip, XFS_ATTR_FORK);
318 break;
319 default:
320 xfs_inode_verifier_error(ip, error, __func__, dip,
321 sizeof(*dip), __this_address);
322 error = -EFSCORRUPTED;
323 break;
324 }
325
326 if (error) {
327 kmem_cache_free(xfs_ifork_cache, ip->i_afp);
328 ip->i_afp = NULL;
329 }
330 return error;
331 }
332
333 /*
334 * Reallocate the space for if_broot based on the number of records
335 * being added or deleted as indicated in rec_diff. Move the records
336 * and pointers in if_broot to fit the new size. When shrinking this
337 * will eliminate holes between the records and pointers created by
338 * the caller. When growing this will create holes to be filled in
339 * by the caller.
340 *
341 * The caller must not request to add more records than would fit in
342 * the on-disk inode root. If the if_broot is currently NULL, then
343 * if we are adding records, one will be allocated. The caller must also
344 * not request that the number of records go below zero, although
345 * it can go to zero.
346 *
347 * ip -- the inode whose if_broot area is changing
348 * ext_diff -- the change in the number of records, positive or negative,
349 * requested for the if_broot array.
350 */
351 void
xfs_iroot_realloc(xfs_inode_t * ip,int rec_diff,int whichfork)352 xfs_iroot_realloc(
353 xfs_inode_t *ip,
354 int rec_diff,
355 int whichfork)
356 {
357 struct xfs_mount *mp = ip->i_mount;
358 int cur_max;
359 struct xfs_ifork *ifp;
360 struct xfs_btree_block *new_broot;
361 int new_max;
362 size_t new_size;
363 char *np;
364 char *op;
365
366 /*
367 * Handle the degenerate case quietly.
368 */
369 if (rec_diff == 0) {
370 return;
371 }
372
373 ifp = XFS_IFORK_PTR(ip, whichfork);
374 if (rec_diff > 0) {
375 /*
376 * If there wasn't any memory allocated before, just
377 * allocate it now and get out.
378 */
379 if (ifp->if_broot_bytes == 0) {
380 new_size = XFS_BMAP_BROOT_SPACE_CALC(mp, rec_diff);
381 ifp->if_broot = kmem_alloc(new_size, KM_NOFS);
382 ifp->if_broot_bytes = (int)new_size;
383 return;
384 }
385
386 /*
387 * If there is already an existing if_broot, then we need
388 * to realloc() it and shift the pointers to their new
389 * location. The records don't change location because
390 * they are kept butted up against the btree block header.
391 */
392 cur_max = xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0);
393 new_max = cur_max + rec_diff;
394 new_size = XFS_BMAP_BROOT_SPACE_CALC(mp, new_max);
395 ifp->if_broot = krealloc(ifp->if_broot, new_size,
396 GFP_NOFS | __GFP_NOFAIL);
397 op = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1,
398 ifp->if_broot_bytes);
399 np = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1,
400 (int)new_size);
401 ifp->if_broot_bytes = (int)new_size;
402 ASSERT(XFS_BMAP_BMDR_SPACE(ifp->if_broot) <=
403 XFS_IFORK_SIZE(ip, whichfork));
404 memmove(np, op, cur_max * (uint)sizeof(xfs_fsblock_t));
405 return;
406 }
407
408 /*
409 * rec_diff is less than 0. In this case, we are shrinking the
410 * if_broot buffer. It must already exist. If we go to zero
411 * records, just get rid of the root and clear the status bit.
412 */
413 ASSERT((ifp->if_broot != NULL) && (ifp->if_broot_bytes > 0));
414 cur_max = xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0);
415 new_max = cur_max + rec_diff;
416 ASSERT(new_max >= 0);
417 if (new_max > 0)
418 new_size = XFS_BMAP_BROOT_SPACE_CALC(mp, new_max);
419 else
420 new_size = 0;
421 if (new_size > 0) {
422 new_broot = kmem_alloc(new_size, KM_NOFS);
423 /*
424 * First copy over the btree block header.
425 */
426 memcpy(new_broot, ifp->if_broot,
427 XFS_BMBT_BLOCK_LEN(ip->i_mount));
428 } else {
429 new_broot = NULL;
430 }
431
432 /*
433 * Only copy the records and pointers if there are any.
434 */
435 if (new_max > 0) {
436 /*
437 * First copy the records.
438 */
439 op = (char *)XFS_BMBT_REC_ADDR(mp, ifp->if_broot, 1);
440 np = (char *)XFS_BMBT_REC_ADDR(mp, new_broot, 1);
441 memcpy(np, op, new_max * (uint)sizeof(xfs_bmbt_rec_t));
442
443 /*
444 * Then copy the pointers.
445 */
446 op = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1,
447 ifp->if_broot_bytes);
448 np = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, new_broot, 1,
449 (int)new_size);
450 memcpy(np, op, new_max * (uint)sizeof(xfs_fsblock_t));
451 }
452 kmem_free(ifp->if_broot);
453 ifp->if_broot = new_broot;
454 ifp->if_broot_bytes = (int)new_size;
455 if (ifp->if_broot)
456 ASSERT(XFS_BMAP_BMDR_SPACE(ifp->if_broot) <=
457 XFS_IFORK_SIZE(ip, whichfork));
458 return;
459 }
460
461
462 /*
463 * This is called when the amount of space needed for if_data
464 * is increased or decreased. The change in size is indicated by
465 * the number of bytes that need to be added or deleted in the
466 * byte_diff parameter.
467 *
468 * If the amount of space needed has decreased below the size of the
469 * inline buffer, then switch to using the inline buffer. Otherwise,
470 * use kmem_realloc() or kmem_alloc() to adjust the size of the buffer
471 * to what is needed.
472 *
473 * ip -- the inode whose if_data area is changing
474 * byte_diff -- the change in the number of bytes, positive or negative,
475 * requested for the if_data array.
476 */
477 void
xfs_idata_realloc(struct xfs_inode * ip,int64_t byte_diff,int whichfork)478 xfs_idata_realloc(
479 struct xfs_inode *ip,
480 int64_t byte_diff,
481 int whichfork)
482 {
483 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
484 int64_t new_size = ifp->if_bytes + byte_diff;
485
486 ASSERT(new_size >= 0);
487 ASSERT(new_size <= XFS_IFORK_SIZE(ip, whichfork));
488
489 if (byte_diff == 0)
490 return;
491
492 if (new_size == 0) {
493 kmem_free(ifp->if_u1.if_data);
494 ifp->if_u1.if_data = NULL;
495 ifp->if_bytes = 0;
496 return;
497 }
498
499 ifp->if_u1.if_data = krealloc(ifp->if_u1.if_data, new_size,
500 GFP_NOFS | __GFP_NOFAIL);
501 ifp->if_bytes = new_size;
502 }
503
504 void
xfs_idestroy_fork(struct xfs_ifork * ifp)505 xfs_idestroy_fork(
506 struct xfs_ifork *ifp)
507 {
508 if (ifp->if_broot != NULL) {
509 kmem_free(ifp->if_broot);
510 ifp->if_broot = NULL;
511 }
512
513 switch (ifp->if_format) {
514 case XFS_DINODE_FMT_LOCAL:
515 kmem_free(ifp->if_u1.if_data);
516 ifp->if_u1.if_data = NULL;
517 break;
518 case XFS_DINODE_FMT_EXTENTS:
519 case XFS_DINODE_FMT_BTREE:
520 if (ifp->if_height)
521 xfs_iext_destroy(ifp);
522 break;
523 }
524 }
525
526 /*
527 * Convert in-core extents to on-disk form
528 *
529 * In the case of the data fork, the in-core and on-disk fork sizes can be
530 * different due to delayed allocation extents. We only copy on-disk extents
531 * here, so callers must always use the physical fork size to determine the
532 * size of the buffer passed to this routine. We will return the size actually
533 * used.
534 */
535 int
xfs_iextents_copy(struct xfs_inode * ip,struct xfs_bmbt_rec * dp,int whichfork)536 xfs_iextents_copy(
537 struct xfs_inode *ip,
538 struct xfs_bmbt_rec *dp,
539 int whichfork)
540 {
541 int state = xfs_bmap_fork_to_state(whichfork);
542 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
543 struct xfs_iext_cursor icur;
544 struct xfs_bmbt_irec rec;
545 int64_t copied = 0;
546
547 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL | XFS_ILOCK_SHARED));
548 ASSERT(ifp->if_bytes > 0);
549
550 for_each_xfs_iext(ifp, &icur, &rec) {
551 if (isnullstartblock(rec.br_startblock))
552 continue;
553 ASSERT(xfs_bmap_validate_extent(ip, whichfork, &rec) == NULL);
554 xfs_bmbt_disk_set_all(dp, &rec);
555 trace_xfs_write_extent(ip, &icur, state, _RET_IP_);
556 copied += sizeof(struct xfs_bmbt_rec);
557 dp++;
558 }
559
560 ASSERT(copied > 0);
561 ASSERT(copied <= ifp->if_bytes);
562 return copied;
563 }
564
565 /*
566 * Each of the following cases stores data into the same region
567 * of the on-disk inode, so only one of them can be valid at
568 * any given time. While it is possible to have conflicting formats
569 * and log flags, e.g. having XFS_ILOG_?DATA set when the fork is
570 * in EXTENTS format, this can only happen when the fork has
571 * changed formats after being modified but before being flushed.
572 * In these cases, the format always takes precedence, because the
573 * format indicates the current state of the fork.
574 */
575 void
xfs_iflush_fork(struct xfs_inode * ip,struct xfs_dinode * dip,struct xfs_inode_log_item * iip,int whichfork)576 xfs_iflush_fork(
577 struct xfs_inode *ip,
578 struct xfs_dinode *dip,
579 struct xfs_inode_log_item *iip,
580 int whichfork)
581 {
582 char *cp;
583 struct xfs_ifork *ifp;
584 xfs_mount_t *mp;
585 static const short brootflag[2] =
586 { XFS_ILOG_DBROOT, XFS_ILOG_ABROOT };
587 static const short dataflag[2] =
588 { XFS_ILOG_DDATA, XFS_ILOG_ADATA };
589 static const short extflag[2] =
590 { XFS_ILOG_DEXT, XFS_ILOG_AEXT };
591
592 if (!iip)
593 return;
594 ifp = XFS_IFORK_PTR(ip, whichfork);
595 /*
596 * This can happen if we gave up in iformat in an error path,
597 * for the attribute fork.
598 */
599 if (!ifp) {
600 ASSERT(whichfork == XFS_ATTR_FORK);
601 return;
602 }
603 cp = XFS_DFORK_PTR(dip, whichfork);
604 mp = ip->i_mount;
605 switch (ifp->if_format) {
606 case XFS_DINODE_FMT_LOCAL:
607 if ((iip->ili_fields & dataflag[whichfork]) &&
608 (ifp->if_bytes > 0)) {
609 ASSERT(ifp->if_u1.if_data != NULL);
610 ASSERT(ifp->if_bytes <= XFS_IFORK_SIZE(ip, whichfork));
611 memcpy(cp, ifp->if_u1.if_data, ifp->if_bytes);
612 }
613 break;
614
615 case XFS_DINODE_FMT_EXTENTS:
616 if ((iip->ili_fields & extflag[whichfork]) &&
617 (ifp->if_bytes > 0)) {
618 ASSERT(ifp->if_nextents > 0);
619 (void)xfs_iextents_copy(ip, (xfs_bmbt_rec_t *)cp,
620 whichfork);
621 }
622 break;
623
624 case XFS_DINODE_FMT_BTREE:
625 if ((iip->ili_fields & brootflag[whichfork]) &&
626 (ifp->if_broot_bytes > 0)) {
627 ASSERT(ifp->if_broot != NULL);
628 ASSERT(XFS_BMAP_BMDR_SPACE(ifp->if_broot) <=
629 XFS_IFORK_SIZE(ip, whichfork));
630 xfs_bmbt_to_bmdr(mp, ifp->if_broot, ifp->if_broot_bytes,
631 (xfs_bmdr_block_t *)cp,
632 XFS_DFORK_SIZE(dip, mp, whichfork));
633 }
634 break;
635
636 case XFS_DINODE_FMT_DEV:
637 if (iip->ili_fields & XFS_ILOG_DEV) {
638 ASSERT(whichfork == XFS_DATA_FORK);
639 xfs_dinode_put_rdev(dip,
640 linux_to_xfs_dev_t(VFS_I(ip)->i_rdev));
641 }
642 break;
643
644 default:
645 ASSERT(0);
646 break;
647 }
648 }
649
650 /* Convert bmap state flags to an inode fork. */
651 struct xfs_ifork *
xfs_iext_state_to_fork(struct xfs_inode * ip,int state)652 xfs_iext_state_to_fork(
653 struct xfs_inode *ip,
654 int state)
655 {
656 if (state & BMAP_COWFORK)
657 return ip->i_cowfp;
658 else if (state & BMAP_ATTRFORK)
659 return ip->i_afp;
660 return &ip->i_df;
661 }
662
663 /*
664 * Initialize an inode's copy-on-write fork.
665 */
666 void
xfs_ifork_init_cow(struct xfs_inode * ip)667 xfs_ifork_init_cow(
668 struct xfs_inode *ip)
669 {
670 if (ip->i_cowfp)
671 return;
672
673 ip->i_cowfp = kmem_cache_zalloc(xfs_ifork_cache,
674 GFP_NOFS | __GFP_NOFAIL);
675 ip->i_cowfp->if_format = XFS_DINODE_FMT_EXTENTS;
676 }
677
678 /* Verify the inline contents of the data fork of an inode. */
679 int
xfs_ifork_verify_local_data(struct xfs_inode * ip)680 xfs_ifork_verify_local_data(
681 struct xfs_inode *ip)
682 {
683 xfs_failaddr_t fa = NULL;
684
685 switch (VFS_I(ip)->i_mode & S_IFMT) {
686 case S_IFDIR:
687 fa = xfs_dir2_sf_verify(ip);
688 break;
689 case S_IFLNK:
690 fa = xfs_symlink_shortform_verify(ip);
691 break;
692 default:
693 break;
694 }
695
696 if (fa) {
697 xfs_inode_verifier_error(ip, -EFSCORRUPTED, "data fork",
698 ip->i_df.if_u1.if_data, ip->i_df.if_bytes, fa);
699 return -EFSCORRUPTED;
700 }
701
702 return 0;
703 }
704
705 /* Verify the inline contents of the attr fork of an inode. */
706 int
xfs_ifork_verify_local_attr(struct xfs_inode * ip)707 xfs_ifork_verify_local_attr(
708 struct xfs_inode *ip)
709 {
710 struct xfs_ifork *ifp = ip->i_afp;
711 xfs_failaddr_t fa;
712
713 if (!ifp)
714 fa = __this_address;
715 else
716 fa = xfs_attr_shortform_verify(ip);
717
718 if (fa) {
719 xfs_inode_verifier_error(ip, -EFSCORRUPTED, "attr fork",
720 ifp ? ifp->if_u1.if_data : NULL,
721 ifp ? ifp->if_bytes : 0, fa);
722 return -EFSCORRUPTED;
723 }
724
725 return 0;
726 }
727
728 int
xfs_iext_count_may_overflow(struct xfs_inode * ip,int whichfork,int nr_to_add)729 xfs_iext_count_may_overflow(
730 struct xfs_inode *ip,
731 int whichfork,
732 int nr_to_add)
733 {
734 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
735 uint64_t max_exts;
736 uint64_t nr_exts;
737
738 if (whichfork == XFS_COW_FORK)
739 return 0;
740
741 max_exts = xfs_iext_max_nextents(xfs_inode_has_large_extent_counts(ip),
742 whichfork);
743
744 if (XFS_TEST_ERROR(false, ip->i_mount, XFS_ERRTAG_REDUCE_MAX_IEXTENTS))
745 max_exts = 10;
746
747 nr_exts = ifp->if_nextents + nr_to_add;
748 if (nr_exts < ifp->if_nextents || nr_exts > max_exts)
749 return -EFBIG;
750
751 return 0;
752 }
753
754 /*
755 * Upgrade this inode's extent counter fields to be able to handle a potential
756 * increase in the extent count by nr_to_add. Normally this is the same
757 * quantity that caused xfs_iext_count_may_overflow() to return -EFBIG.
758 */
759 int
xfs_iext_count_upgrade(struct xfs_trans * tp,struct xfs_inode * ip,uint nr_to_add)760 xfs_iext_count_upgrade(
761 struct xfs_trans *tp,
762 struct xfs_inode *ip,
763 uint nr_to_add)
764 {
765 ASSERT(nr_to_add <= XFS_MAX_EXTCNT_UPGRADE_NR);
766
767 if (!xfs_has_large_extent_counts(ip->i_mount) ||
768 xfs_inode_has_large_extent_counts(ip) ||
769 XFS_TEST_ERROR(false, ip->i_mount, XFS_ERRTAG_REDUCE_MAX_IEXTENTS))
770 return -EFBIG;
771
772 ip->i_diflags2 |= XFS_DIFLAG2_NREXT64;
773 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
774
775 return 0;
776 }
777