1 /*
2 * Copyright (c) 2000-2005 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_inum.h"
23 #include "xfs_log.h"
24 #include "xfs_trans.h"
25 #include "xfs_sb.h"
26 #include "xfs_ag.h"
27 #include "xfs_mount.h"
28 #include "xfs_bmap_btree.h"
29 #include "xfs_alloc_btree.h"
30 #include "xfs_ialloc_btree.h"
31 #include "xfs_dinode.h"
32 #include "xfs_inode.h"
33 #include "xfs_inode_item.h"
34 #include "xfs_btree.h"
35 #include "xfs_error.h"
36 #include "xfs_alloc.h"
37 #include "xfs_ialloc.h"
38 #include "xfs_fsops.h"
39 #include "xfs_itable.h"
40 #include "xfs_trans_space.h"
41 #include "xfs_rtalloc.h"
42 #include "xfs_rw.h"
43 #include "xfs_filestream.h"
44 #include "xfs_trace.h"
45
46 /*
47 * File system operations
48 */
49
50 int
xfs_fs_geometry(xfs_mount_t * mp,xfs_fsop_geom_t * geo,int new_version)51 xfs_fs_geometry(
52 xfs_mount_t *mp,
53 xfs_fsop_geom_t *geo,
54 int new_version)
55 {
56
57 memset(geo, 0, sizeof(*geo));
58
59 geo->blocksize = mp->m_sb.sb_blocksize;
60 geo->rtextsize = mp->m_sb.sb_rextsize;
61 geo->agblocks = mp->m_sb.sb_agblocks;
62 geo->agcount = mp->m_sb.sb_agcount;
63 geo->logblocks = mp->m_sb.sb_logblocks;
64 geo->sectsize = mp->m_sb.sb_sectsize;
65 geo->inodesize = mp->m_sb.sb_inodesize;
66 geo->imaxpct = mp->m_sb.sb_imax_pct;
67 geo->datablocks = mp->m_sb.sb_dblocks;
68 geo->rtblocks = mp->m_sb.sb_rblocks;
69 geo->rtextents = mp->m_sb.sb_rextents;
70 geo->logstart = mp->m_sb.sb_logstart;
71 ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
72 memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
73 if (new_version >= 2) {
74 geo->sunit = mp->m_sb.sb_unit;
75 geo->swidth = mp->m_sb.sb_width;
76 }
77 if (new_version >= 3) {
78 geo->version = XFS_FSOP_GEOM_VERSION;
79 geo->flags =
80 (xfs_sb_version_hasattr(&mp->m_sb) ?
81 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
82 (xfs_sb_version_hasnlink(&mp->m_sb) ?
83 XFS_FSOP_GEOM_FLAGS_NLINK : 0) |
84 (xfs_sb_version_hasquota(&mp->m_sb) ?
85 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
86 (xfs_sb_version_hasalign(&mp->m_sb) ?
87 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
88 (xfs_sb_version_hasdalign(&mp->m_sb) ?
89 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
90 (xfs_sb_version_hasshared(&mp->m_sb) ?
91 XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
92 (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
93 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
94 (xfs_sb_version_hasdirv2(&mp->m_sb) ?
95 XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) |
96 (xfs_sb_version_hassector(&mp->m_sb) ?
97 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
98 (xfs_sb_version_hasasciici(&mp->m_sb) ?
99 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
100 (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
101 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
102 (xfs_sb_version_hasattr2(&mp->m_sb) ?
103 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0);
104 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
105 mp->m_sb.sb_logsectsize : BBSIZE;
106 geo->rtsectsize = mp->m_sb.sb_blocksize;
107 geo->dirblocksize = mp->m_dirblksize;
108 }
109 if (new_version >= 4) {
110 geo->flags |=
111 (xfs_sb_version_haslogv2(&mp->m_sb) ?
112 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
113 geo->logsunit = mp->m_sb.sb_logsunit;
114 }
115 return 0;
116 }
117
118 static int
xfs_growfs_data_private(xfs_mount_t * mp,xfs_growfs_data_t * in)119 xfs_growfs_data_private(
120 xfs_mount_t *mp, /* mount point for filesystem */
121 xfs_growfs_data_t *in) /* growfs data input struct */
122 {
123 xfs_agf_t *agf;
124 xfs_agi_t *agi;
125 xfs_agnumber_t agno;
126 xfs_extlen_t agsize;
127 xfs_extlen_t tmpsize;
128 xfs_alloc_rec_t *arec;
129 struct xfs_btree_block *block;
130 xfs_buf_t *bp;
131 int bucket;
132 int dpct;
133 int error;
134 xfs_agnumber_t nagcount;
135 xfs_agnumber_t nagimax = 0;
136 xfs_rfsblock_t nb, nb_mod;
137 xfs_rfsblock_t new;
138 xfs_rfsblock_t nfree;
139 xfs_agnumber_t oagcount;
140 int pct;
141 xfs_trans_t *tp;
142
143 nb = in->newblocks;
144 pct = in->imaxpct;
145 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
146 return XFS_ERROR(EINVAL);
147 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
148 return error;
149 dpct = pct - mp->m_sb.sb_imax_pct;
150 bp = xfs_buf_read_uncached(mp, mp->m_ddev_targp,
151 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
152 BBTOB(XFS_FSS_TO_BB(mp, 1)), 0);
153 if (!bp)
154 return EIO;
155 xfs_buf_relse(bp);
156
157 new = nb; /* use new as a temporary here */
158 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
159 nagcount = new + (nb_mod != 0);
160 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
161 nagcount--;
162 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
163 if (nb < mp->m_sb.sb_dblocks)
164 return XFS_ERROR(EINVAL);
165 }
166 new = nb - mp->m_sb.sb_dblocks;
167 oagcount = mp->m_sb.sb_agcount;
168
169 /* allocate the new per-ag structures */
170 if (nagcount > oagcount) {
171 error = xfs_initialize_perag(mp, nagcount, &nagimax);
172 if (error)
173 return error;
174 }
175
176 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
177 tp->t_flags |= XFS_TRANS_RESERVE;
178 if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
179 XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
180 xfs_trans_cancel(tp, 0);
181 return error;
182 }
183
184 /*
185 * Write new AG headers to disk. Non-transactional, but written
186 * synchronously so they are completed prior to the growfs transaction
187 * being logged.
188 */
189 nfree = 0;
190 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
191 /*
192 * AG freelist header block
193 */
194 bp = xfs_buf_get(mp->m_ddev_targp,
195 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
196 XFS_FSS_TO_BB(mp, 1), XBF_LOCK | XBF_MAPPED);
197 if (!bp) {
198 error = ENOMEM;
199 goto error0;
200 }
201 agf = XFS_BUF_TO_AGF(bp);
202 memset(agf, 0, mp->m_sb.sb_sectsize);
203 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
204 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
205 agf->agf_seqno = cpu_to_be32(agno);
206 if (agno == nagcount - 1)
207 agsize =
208 nb -
209 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
210 else
211 agsize = mp->m_sb.sb_agblocks;
212 agf->agf_length = cpu_to_be32(agsize);
213 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
214 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
215 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
216 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
217 agf->agf_flfirst = 0;
218 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
219 agf->agf_flcount = 0;
220 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
221 agf->agf_freeblks = cpu_to_be32(tmpsize);
222 agf->agf_longest = cpu_to_be32(tmpsize);
223 error = xfs_bwrite(bp);
224 xfs_buf_relse(bp);
225 if (error)
226 goto error0;
227
228 /*
229 * AG inode header block
230 */
231 bp = xfs_buf_get(mp->m_ddev_targp,
232 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
233 XFS_FSS_TO_BB(mp, 1), XBF_LOCK | XBF_MAPPED);
234 if (!bp) {
235 error = ENOMEM;
236 goto error0;
237 }
238 agi = XFS_BUF_TO_AGI(bp);
239 memset(agi, 0, mp->m_sb.sb_sectsize);
240 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
241 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
242 agi->agi_seqno = cpu_to_be32(agno);
243 agi->agi_length = cpu_to_be32(agsize);
244 agi->agi_count = 0;
245 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
246 agi->agi_level = cpu_to_be32(1);
247 agi->agi_freecount = 0;
248 agi->agi_newino = cpu_to_be32(NULLAGINO);
249 agi->agi_dirino = cpu_to_be32(NULLAGINO);
250 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
251 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
252 error = xfs_bwrite(bp);
253 xfs_buf_relse(bp);
254 if (error)
255 goto error0;
256
257 /*
258 * BNO btree root block
259 */
260 bp = xfs_buf_get(mp->m_ddev_targp,
261 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
262 BTOBB(mp->m_sb.sb_blocksize),
263 XBF_LOCK | XBF_MAPPED);
264 if (!bp) {
265 error = ENOMEM;
266 goto error0;
267 }
268 block = XFS_BUF_TO_BLOCK(bp);
269 memset(block, 0, mp->m_sb.sb_blocksize);
270 block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC);
271 block->bb_level = 0;
272 block->bb_numrecs = cpu_to_be16(1);
273 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
274 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
275 arec = XFS_ALLOC_REC_ADDR(mp, block, 1);
276 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
277 arec->ar_blockcount = cpu_to_be32(
278 agsize - be32_to_cpu(arec->ar_startblock));
279 error = xfs_bwrite(bp);
280 xfs_buf_relse(bp);
281 if (error)
282 goto error0;
283
284 /*
285 * CNT btree root block
286 */
287 bp = xfs_buf_get(mp->m_ddev_targp,
288 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
289 BTOBB(mp->m_sb.sb_blocksize),
290 XBF_LOCK | XBF_MAPPED);
291 if (!bp) {
292 error = ENOMEM;
293 goto error0;
294 }
295 block = XFS_BUF_TO_BLOCK(bp);
296 memset(block, 0, mp->m_sb.sb_blocksize);
297 block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC);
298 block->bb_level = 0;
299 block->bb_numrecs = cpu_to_be16(1);
300 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
301 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
302 arec = XFS_ALLOC_REC_ADDR(mp, block, 1);
303 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
304 arec->ar_blockcount = cpu_to_be32(
305 agsize - be32_to_cpu(arec->ar_startblock));
306 nfree += be32_to_cpu(arec->ar_blockcount);
307 error = xfs_bwrite(bp);
308 xfs_buf_relse(bp);
309 if (error)
310 goto error0;
311
312 /*
313 * INO btree root block
314 */
315 bp = xfs_buf_get(mp->m_ddev_targp,
316 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
317 BTOBB(mp->m_sb.sb_blocksize),
318 XBF_LOCK | XBF_MAPPED);
319 if (!bp) {
320 error = ENOMEM;
321 goto error0;
322 }
323 block = XFS_BUF_TO_BLOCK(bp);
324 memset(block, 0, mp->m_sb.sb_blocksize);
325 block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC);
326 block->bb_level = 0;
327 block->bb_numrecs = 0;
328 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
329 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
330 error = xfs_bwrite(bp);
331 xfs_buf_relse(bp);
332 if (error)
333 goto error0;
334 }
335 xfs_trans_agblocks_delta(tp, nfree);
336 /*
337 * There are new blocks in the old last a.g.
338 */
339 if (new) {
340 /*
341 * Change the agi length.
342 */
343 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
344 if (error) {
345 goto error0;
346 }
347 ASSERT(bp);
348 agi = XFS_BUF_TO_AGI(bp);
349 be32_add_cpu(&agi->agi_length, new);
350 ASSERT(nagcount == oagcount ||
351 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
352 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
353 /*
354 * Change agf length.
355 */
356 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
357 if (error) {
358 goto error0;
359 }
360 ASSERT(bp);
361 agf = XFS_BUF_TO_AGF(bp);
362 be32_add_cpu(&agf->agf_length, new);
363 ASSERT(be32_to_cpu(agf->agf_length) ==
364 be32_to_cpu(agi->agi_length));
365
366 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
367 /*
368 * Free the new space.
369 */
370 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
371 be32_to_cpu(agf->agf_length) - new), new);
372 if (error) {
373 goto error0;
374 }
375 }
376
377 /*
378 * Update changed superblock fields transactionally. These are not
379 * seen by the rest of the world until the transaction commit applies
380 * them atomically to the superblock.
381 */
382 if (nagcount > oagcount)
383 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
384 if (nb > mp->m_sb.sb_dblocks)
385 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
386 nb - mp->m_sb.sb_dblocks);
387 if (nfree)
388 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
389 if (dpct)
390 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
391 error = xfs_trans_commit(tp, 0);
392 if (error)
393 return error;
394
395 /* New allocation groups fully initialized, so update mount struct */
396 if (nagimax)
397 mp->m_maxagi = nagimax;
398 if (mp->m_sb.sb_imax_pct) {
399 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
400 do_div(icount, 100);
401 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
402 } else
403 mp->m_maxicount = 0;
404 xfs_set_low_space_thresholds(mp);
405
406 /* update secondary superblocks. */
407 for (agno = 1; agno < nagcount; agno++) {
408 error = xfs_read_buf(mp, mp->m_ddev_targp,
409 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
410 XFS_FSS_TO_BB(mp, 1), 0, &bp);
411 if (error) {
412 xfs_warn(mp,
413 "error %d reading secondary superblock for ag %d",
414 error, agno);
415 break;
416 }
417 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
418 /*
419 * If we get an error writing out the alternate superblocks,
420 * just issue a warning and continue. The real work is
421 * already done and committed.
422 */
423 error = xfs_bwrite(bp);
424 xfs_buf_relse(bp);
425 if (error) {
426 xfs_warn(mp,
427 "write error %d updating secondary superblock for ag %d",
428 error, agno);
429 break; /* no point in continuing */
430 }
431 }
432 return 0;
433
434 error0:
435 xfs_trans_cancel(tp, XFS_TRANS_ABORT);
436 return error;
437 }
438
439 static int
xfs_growfs_log_private(xfs_mount_t * mp,xfs_growfs_log_t * in)440 xfs_growfs_log_private(
441 xfs_mount_t *mp, /* mount point for filesystem */
442 xfs_growfs_log_t *in) /* growfs log input struct */
443 {
444 xfs_extlen_t nb;
445
446 nb = in->newblocks;
447 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
448 return XFS_ERROR(EINVAL);
449 if (nb == mp->m_sb.sb_logblocks &&
450 in->isint == (mp->m_sb.sb_logstart != 0))
451 return XFS_ERROR(EINVAL);
452 /*
453 * Moving the log is hard, need new interfaces to sync
454 * the log first, hold off all activity while moving it.
455 * Can have shorter or longer log in the same space,
456 * or transform internal to external log or vice versa.
457 */
458 return XFS_ERROR(ENOSYS);
459 }
460
461 /*
462 * protected versions of growfs function acquire and release locks on the mount
463 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
464 * XFS_IOC_FSGROWFSRT
465 */
466
467
468 int
xfs_growfs_data(xfs_mount_t * mp,xfs_growfs_data_t * in)469 xfs_growfs_data(
470 xfs_mount_t *mp,
471 xfs_growfs_data_t *in)
472 {
473 int error;
474
475 if (!capable(CAP_SYS_ADMIN))
476 return XFS_ERROR(EPERM);
477 if (!mutex_trylock(&mp->m_growlock))
478 return XFS_ERROR(EWOULDBLOCK);
479 error = xfs_growfs_data_private(mp, in);
480 mutex_unlock(&mp->m_growlock);
481 return error;
482 }
483
484 int
xfs_growfs_log(xfs_mount_t * mp,xfs_growfs_log_t * in)485 xfs_growfs_log(
486 xfs_mount_t *mp,
487 xfs_growfs_log_t *in)
488 {
489 int error;
490
491 if (!capable(CAP_SYS_ADMIN))
492 return XFS_ERROR(EPERM);
493 if (!mutex_trylock(&mp->m_growlock))
494 return XFS_ERROR(EWOULDBLOCK);
495 error = xfs_growfs_log_private(mp, in);
496 mutex_unlock(&mp->m_growlock);
497 return error;
498 }
499
500 /*
501 * exported through ioctl XFS_IOC_FSCOUNTS
502 */
503
504 int
xfs_fs_counts(xfs_mount_t * mp,xfs_fsop_counts_t * cnt)505 xfs_fs_counts(
506 xfs_mount_t *mp,
507 xfs_fsop_counts_t *cnt)
508 {
509 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
510 spin_lock(&mp->m_sb_lock);
511 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
512 cnt->freertx = mp->m_sb.sb_frextents;
513 cnt->freeino = mp->m_sb.sb_ifree;
514 cnt->allocino = mp->m_sb.sb_icount;
515 spin_unlock(&mp->m_sb_lock);
516 return 0;
517 }
518
519 /*
520 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
521 *
522 * xfs_reserve_blocks is called to set m_resblks
523 * in the in-core mount table. The number of unused reserved blocks
524 * is kept in m_resblks_avail.
525 *
526 * Reserve the requested number of blocks if available. Otherwise return
527 * as many as possible to satisfy the request. The actual number
528 * reserved are returned in outval
529 *
530 * A null inval pointer indicates that only the current reserved blocks
531 * available should be returned no settings are changed.
532 */
533
534 int
xfs_reserve_blocks(xfs_mount_t * mp,__uint64_t * inval,xfs_fsop_resblks_t * outval)535 xfs_reserve_blocks(
536 xfs_mount_t *mp,
537 __uint64_t *inval,
538 xfs_fsop_resblks_t *outval)
539 {
540 __int64_t lcounter, delta, fdblks_delta;
541 __uint64_t request;
542
543 /* If inval is null, report current values and return */
544 if (inval == (__uint64_t *)NULL) {
545 if (!outval)
546 return EINVAL;
547 outval->resblks = mp->m_resblks;
548 outval->resblks_avail = mp->m_resblks_avail;
549 return 0;
550 }
551
552 request = *inval;
553
554 /*
555 * With per-cpu counters, this becomes an interesting
556 * problem. we needto work out if we are freeing or allocation
557 * blocks first, then we can do the modification as necessary.
558 *
559 * We do this under the m_sb_lock so that if we are near
560 * ENOSPC, we will hold out any changes while we work out
561 * what to do. This means that the amount of free space can
562 * change while we do this, so we need to retry if we end up
563 * trying to reserve more space than is available.
564 *
565 * We also use the xfs_mod_incore_sb() interface so that we
566 * don't have to care about whether per cpu counter are
567 * enabled, disabled or even compiled in....
568 */
569 retry:
570 spin_lock(&mp->m_sb_lock);
571 xfs_icsb_sync_counters_locked(mp, 0);
572
573 /*
574 * If our previous reservation was larger than the current value,
575 * then move any unused blocks back to the free pool.
576 */
577 fdblks_delta = 0;
578 if (mp->m_resblks > request) {
579 lcounter = mp->m_resblks_avail - request;
580 if (lcounter > 0) { /* release unused blocks */
581 fdblks_delta = lcounter;
582 mp->m_resblks_avail -= lcounter;
583 }
584 mp->m_resblks = request;
585 } else {
586 __int64_t free;
587
588 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
589 if (!free)
590 goto out; /* ENOSPC and fdblks_delta = 0 */
591
592 delta = request - mp->m_resblks;
593 lcounter = free - delta;
594 if (lcounter < 0) {
595 /* We can't satisfy the request, just get what we can */
596 mp->m_resblks += free;
597 mp->m_resblks_avail += free;
598 fdblks_delta = -free;
599 } else {
600 fdblks_delta = -delta;
601 mp->m_resblks = request;
602 mp->m_resblks_avail += delta;
603 }
604 }
605 out:
606 if (outval) {
607 outval->resblks = mp->m_resblks;
608 outval->resblks_avail = mp->m_resblks_avail;
609 }
610 spin_unlock(&mp->m_sb_lock);
611
612 if (fdblks_delta) {
613 /*
614 * If we are putting blocks back here, m_resblks_avail is
615 * already at its max so this will put it in the free pool.
616 *
617 * If we need space, we'll either succeed in getting it
618 * from the free block count or we'll get an enospc. If
619 * we get a ENOSPC, it means things changed while we were
620 * calculating fdblks_delta and so we should try again to
621 * see if there is anything left to reserve.
622 *
623 * Don't set the reserved flag here - we don't want to reserve
624 * the extra reserve blocks from the reserve.....
625 */
626 int error;
627 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
628 fdblks_delta, 0);
629 if (error == ENOSPC)
630 goto retry;
631 }
632 return 0;
633 }
634
635 /*
636 * Dump a transaction into the log that contains no real change. This is needed
637 * to be able to make the log dirty or stamp the current tail LSN into the log
638 * during the covering operation.
639 *
640 * We cannot use an inode here for this - that will push dirty state back up
641 * into the VFS and then periodic inode flushing will prevent log covering from
642 * making progress. Hence we log a field in the superblock instead and use a
643 * synchronous transaction to ensure the superblock is immediately unpinned
644 * and can be written back.
645 */
646 int
xfs_fs_log_dummy(xfs_mount_t * mp)647 xfs_fs_log_dummy(
648 xfs_mount_t *mp)
649 {
650 xfs_trans_t *tp;
651 int error;
652
653 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
654 error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
655 XFS_DEFAULT_LOG_COUNT);
656 if (error) {
657 xfs_trans_cancel(tp, 0);
658 return error;
659 }
660
661 /* log the UUID because it is an unchanging field */
662 xfs_mod_sb(tp, XFS_SB_UUID);
663 xfs_trans_set_sync(tp);
664 return xfs_trans_commit(tp, 0);
665 }
666
667 int
xfs_fs_goingdown(xfs_mount_t * mp,__uint32_t inflags)668 xfs_fs_goingdown(
669 xfs_mount_t *mp,
670 __uint32_t inflags)
671 {
672 switch (inflags) {
673 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
674 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
675
676 if (sb && !IS_ERR(sb)) {
677 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
678 thaw_bdev(sb->s_bdev, sb);
679 }
680
681 break;
682 }
683 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
684 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
685 break;
686 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
687 xfs_force_shutdown(mp,
688 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
689 break;
690 default:
691 return XFS_ERROR(EINVAL);
692 }
693
694 return 0;
695 }
696