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xfs: add CRC checks to the AGF
[deliverable/linux.git] / fs / xfs / xfs_fsops.c
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_log.h"
22 #include "xfs_trans.h"
23 #include "xfs_sb.h"
24 #include "xfs_ag.h"
25 #include "xfs_mount.h"
26 #include "xfs_bmap_btree.h"
27 #include "xfs_alloc_btree.h"
28 #include "xfs_ialloc_btree.h"
29 #include "xfs_dinode.h"
30 #include "xfs_inode.h"
31 #include "xfs_inode_item.h"
32 #include "xfs_btree.h"
33 #include "xfs_error.h"
34 #include "xfs_alloc.h"
35 #include "xfs_ialloc.h"
36 #include "xfs_fsops.h"
37 #include "xfs_itable.h"
38 #include "xfs_trans_space.h"
39 #include "xfs_rtalloc.h"
40 #include "xfs_filestream.h"
41 #include "xfs_trace.h"
42
43 /*
44 * File system operations
45 */
46
47 int
48 xfs_fs_geometry(
49 xfs_mount_t *mp,
50 xfs_fsop_geom_t *geo,
51 int new_version)
52 {
53
54 memset(geo, 0, sizeof(*geo));
55
56 geo->blocksize = mp->m_sb.sb_blocksize;
57 geo->rtextsize = mp->m_sb.sb_rextsize;
58 geo->agblocks = mp->m_sb.sb_agblocks;
59 geo->agcount = mp->m_sb.sb_agcount;
60 geo->logblocks = mp->m_sb.sb_logblocks;
61 geo->sectsize = mp->m_sb.sb_sectsize;
62 geo->inodesize = mp->m_sb.sb_inodesize;
63 geo->imaxpct = mp->m_sb.sb_imax_pct;
64 geo->datablocks = mp->m_sb.sb_dblocks;
65 geo->rtblocks = mp->m_sb.sb_rblocks;
66 geo->rtextents = mp->m_sb.sb_rextents;
67 geo->logstart = mp->m_sb.sb_logstart;
68 ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
69 memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
70 if (new_version >= 2) {
71 geo->sunit = mp->m_sb.sb_unit;
72 geo->swidth = mp->m_sb.sb_width;
73 }
74 if (new_version >= 3) {
75 geo->version = XFS_FSOP_GEOM_VERSION;
76 geo->flags =
77 (xfs_sb_version_hasattr(&mp->m_sb) ?
78 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
79 (xfs_sb_version_hasnlink(&mp->m_sb) ?
80 XFS_FSOP_GEOM_FLAGS_NLINK : 0) |
81 (xfs_sb_version_hasquota(&mp->m_sb) ?
82 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
83 (xfs_sb_version_hasalign(&mp->m_sb) ?
84 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
85 (xfs_sb_version_hasdalign(&mp->m_sb) ?
86 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
87 (xfs_sb_version_hasshared(&mp->m_sb) ?
88 XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
89 (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
90 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
91 (xfs_sb_version_hasdirv2(&mp->m_sb) ?
92 XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) |
93 (xfs_sb_version_hassector(&mp->m_sb) ?
94 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
95 (xfs_sb_version_hasasciici(&mp->m_sb) ?
96 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
97 (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
98 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
99 (xfs_sb_version_hasattr2(&mp->m_sb) ?
100 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) |
101 (xfs_sb_version_hasprojid32bit(&mp->m_sb) ?
102 XFS_FSOP_GEOM_FLAGS_PROJID32 : 0);
103 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
104 mp->m_sb.sb_logsectsize : BBSIZE;
105 geo->rtsectsize = mp->m_sb.sb_blocksize;
106 geo->dirblocksize = mp->m_dirblksize;
107 }
108 if (new_version >= 4) {
109 geo->flags |=
110 (xfs_sb_version_haslogv2(&mp->m_sb) ?
111 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
112 geo->logsunit = mp->m_sb.sb_logsunit;
113 }
114 return 0;
115 }
116
117 static struct xfs_buf *
118 xfs_growfs_get_hdr_buf(
119 struct xfs_mount *mp,
120 xfs_daddr_t blkno,
121 size_t numblks,
122 int flags,
123 const struct xfs_buf_ops *ops)
124 {
125 struct xfs_buf *bp;
126
127 bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
128 if (!bp)
129 return NULL;
130
131 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
132 bp->b_bn = blkno;
133 bp->b_maps[0].bm_bn = blkno;
134 bp->b_ops = ops;
135
136 return bp;
137 }
138
139 static int
140 xfs_growfs_data_private(
141 xfs_mount_t *mp, /* mount point for filesystem */
142 xfs_growfs_data_t *in) /* growfs data input struct */
143 {
144 xfs_agf_t *agf;
145 struct xfs_agfl *agfl;
146 xfs_agi_t *agi;
147 xfs_agnumber_t agno;
148 xfs_extlen_t agsize;
149 xfs_extlen_t tmpsize;
150 xfs_alloc_rec_t *arec;
151 xfs_buf_t *bp;
152 int bucket;
153 int dpct;
154 int error;
155 xfs_agnumber_t nagcount;
156 xfs_agnumber_t nagimax = 0;
157 xfs_rfsblock_t nb, nb_mod;
158 xfs_rfsblock_t new;
159 xfs_rfsblock_t nfree;
160 xfs_agnumber_t oagcount;
161 int pct;
162 xfs_trans_t *tp;
163
164 nb = in->newblocks;
165 pct = in->imaxpct;
166 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
167 return XFS_ERROR(EINVAL);
168 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
169 return error;
170 dpct = pct - mp->m_sb.sb_imax_pct;
171 bp = xfs_buf_read_uncached(mp->m_ddev_targp,
172 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
173 XFS_FSS_TO_BB(mp, 1), 0, NULL);
174 if (!bp)
175 return EIO;
176 if (bp->b_error) {
177 int error = bp->b_error;
178 xfs_buf_relse(bp);
179 return error;
180 }
181 xfs_buf_relse(bp);
182
183 new = nb; /* use new as a temporary here */
184 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
185 nagcount = new + (nb_mod != 0);
186 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
187 nagcount--;
188 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
189 if (nb < mp->m_sb.sb_dblocks)
190 return XFS_ERROR(EINVAL);
191 }
192 new = nb - mp->m_sb.sb_dblocks;
193 oagcount = mp->m_sb.sb_agcount;
194
195 /* allocate the new per-ag structures */
196 if (nagcount > oagcount) {
197 error = xfs_initialize_perag(mp, nagcount, &nagimax);
198 if (error)
199 return error;
200 }
201
202 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
203 tp->t_flags |= XFS_TRANS_RESERVE;
204 if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
205 XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
206 xfs_trans_cancel(tp, 0);
207 return error;
208 }
209
210 /*
211 * Write new AG headers to disk. Non-transactional, but written
212 * synchronously so they are completed prior to the growfs transaction
213 * being logged.
214 */
215 nfree = 0;
216 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
217 /*
218 * AG freespace header block
219 */
220 bp = xfs_growfs_get_hdr_buf(mp,
221 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
222 XFS_FSS_TO_BB(mp, 1), 0,
223 &xfs_agf_buf_ops);
224 if (!bp) {
225 error = ENOMEM;
226 goto error0;
227 }
228
229 agf = XFS_BUF_TO_AGF(bp);
230 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
231 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
232 agf->agf_seqno = cpu_to_be32(agno);
233 if (agno == nagcount - 1)
234 agsize =
235 nb -
236 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
237 else
238 agsize = mp->m_sb.sb_agblocks;
239 agf->agf_length = cpu_to_be32(agsize);
240 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
241 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
242 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
243 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
244 agf->agf_flfirst = 0;
245 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
246 agf->agf_flcount = 0;
247 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
248 agf->agf_freeblks = cpu_to_be32(tmpsize);
249 agf->agf_longest = cpu_to_be32(tmpsize);
250 if (xfs_sb_version_hascrc(&mp->m_sb))
251 uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_uuid);
252
253 error = xfs_bwrite(bp);
254 xfs_buf_relse(bp);
255 if (error)
256 goto error0;
257
258 /*
259 * AG freelist header block
260 */
261 bp = xfs_growfs_get_hdr_buf(mp,
262 XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)),
263 XFS_FSS_TO_BB(mp, 1), 0,
264 &xfs_agfl_buf_ops);
265 if (!bp) {
266 error = ENOMEM;
267 goto error0;
268 }
269
270 agfl = XFS_BUF_TO_AGFL(bp);
271 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
272 agfl->agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
273
274 error = xfs_bwrite(bp);
275 xfs_buf_relse(bp);
276 if (error)
277 goto error0;
278
279 /*
280 * AG inode header block
281 */
282 bp = xfs_growfs_get_hdr_buf(mp,
283 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
284 XFS_FSS_TO_BB(mp, 1), 0,
285 &xfs_agi_buf_ops);
286 if (!bp) {
287 error = ENOMEM;
288 goto error0;
289 }
290
291 agi = XFS_BUF_TO_AGI(bp);
292 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
293 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
294 agi->agi_seqno = cpu_to_be32(agno);
295 agi->agi_length = cpu_to_be32(agsize);
296 agi->agi_count = 0;
297 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
298 agi->agi_level = cpu_to_be32(1);
299 agi->agi_freecount = 0;
300 agi->agi_newino = cpu_to_be32(NULLAGINO);
301 agi->agi_dirino = cpu_to_be32(NULLAGINO);
302 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
303 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
304 error = xfs_bwrite(bp);
305 xfs_buf_relse(bp);
306 if (error)
307 goto error0;
308
309 /*
310 * BNO btree root block
311 */
312 bp = xfs_growfs_get_hdr_buf(mp,
313 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
314 BTOBB(mp->m_sb.sb_blocksize), 0,
315 &xfs_allocbt_buf_ops);
316
317 if (!bp) {
318 error = ENOMEM;
319 goto error0;
320 }
321
322 if (xfs_sb_version_hascrc(&mp->m_sb))
323 xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1,
324 agno, XFS_BTREE_CRC_BLOCKS);
325 else
326 xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1,
327 agno, 0);
328
329 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
330 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
331 arec->ar_blockcount = cpu_to_be32(
332 agsize - be32_to_cpu(arec->ar_startblock));
333
334 error = xfs_bwrite(bp);
335 xfs_buf_relse(bp);
336 if (error)
337 goto error0;
338
339 /*
340 * CNT btree root block
341 */
342 bp = xfs_growfs_get_hdr_buf(mp,
343 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
344 BTOBB(mp->m_sb.sb_blocksize), 0,
345 &xfs_allocbt_buf_ops);
346 if (!bp) {
347 error = ENOMEM;
348 goto error0;
349 }
350
351 if (xfs_sb_version_hascrc(&mp->m_sb))
352 xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1,
353 agno, XFS_BTREE_CRC_BLOCKS);
354 else
355 xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1,
356 agno, 0);
357
358 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
359 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
360 arec->ar_blockcount = cpu_to_be32(
361 agsize - be32_to_cpu(arec->ar_startblock));
362 nfree += be32_to_cpu(arec->ar_blockcount);
363
364 error = xfs_bwrite(bp);
365 xfs_buf_relse(bp);
366 if (error)
367 goto error0;
368
369 /*
370 * INO btree root block
371 */
372 bp = xfs_growfs_get_hdr_buf(mp,
373 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
374 BTOBB(mp->m_sb.sb_blocksize), 0,
375 &xfs_inobt_buf_ops);
376 if (!bp) {
377 error = ENOMEM;
378 goto error0;
379 }
380
381 if (xfs_sb_version_hascrc(&mp->m_sb))
382 xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0,
383 agno, XFS_BTREE_CRC_BLOCKS);
384 else
385 xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0,
386 agno, 0);
387
388 error = xfs_bwrite(bp);
389 xfs_buf_relse(bp);
390 if (error)
391 goto error0;
392 }
393 xfs_trans_agblocks_delta(tp, nfree);
394 /*
395 * There are new blocks in the old last a.g.
396 */
397 if (new) {
398 /*
399 * Change the agi length.
400 */
401 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
402 if (error) {
403 goto error0;
404 }
405 ASSERT(bp);
406 agi = XFS_BUF_TO_AGI(bp);
407 be32_add_cpu(&agi->agi_length, new);
408 ASSERT(nagcount == oagcount ||
409 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
410 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
411 /*
412 * Change agf length.
413 */
414 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
415 if (error) {
416 goto error0;
417 }
418 ASSERT(bp);
419 agf = XFS_BUF_TO_AGF(bp);
420 be32_add_cpu(&agf->agf_length, new);
421 ASSERT(be32_to_cpu(agf->agf_length) ==
422 be32_to_cpu(agi->agi_length));
423
424 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
425 /*
426 * Free the new space.
427 */
428 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
429 be32_to_cpu(agf->agf_length) - new), new);
430 if (error) {
431 goto error0;
432 }
433 }
434
435 /*
436 * Update changed superblock fields transactionally. These are not
437 * seen by the rest of the world until the transaction commit applies
438 * them atomically to the superblock.
439 */
440 if (nagcount > oagcount)
441 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
442 if (nb > mp->m_sb.sb_dblocks)
443 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
444 nb - mp->m_sb.sb_dblocks);
445 if (nfree)
446 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
447 if (dpct)
448 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
449 error = xfs_trans_commit(tp, 0);
450 if (error)
451 return error;
452
453 /* New allocation groups fully initialized, so update mount struct */
454 if (nagimax)
455 mp->m_maxagi = nagimax;
456 if (mp->m_sb.sb_imax_pct) {
457 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
458 do_div(icount, 100);
459 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
460 } else
461 mp->m_maxicount = 0;
462 xfs_set_low_space_thresholds(mp);
463
464 /* update secondary superblocks. */
465 for (agno = 1; agno < nagcount; agno++) {
466 error = 0;
467 /*
468 * new secondary superblocks need to be zeroed, not read from
469 * disk as the contents of the new area we are growing into is
470 * completely unknown.
471 */
472 if (agno < oagcount) {
473 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
474 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
475 XFS_FSS_TO_BB(mp, 1), 0, &bp,
476 &xfs_sb_buf_ops);
477 } else {
478 bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
479 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
480 XFS_FSS_TO_BB(mp, 1), 0);
481 if (bp) {
482 bp->b_ops = &xfs_sb_buf_ops;
483 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
484 } else
485 error = ENOMEM;
486 }
487
488 if (error) {
489 xfs_warn(mp,
490 "error %d reading secondary superblock for ag %d",
491 error, agno);
492 break;
493 }
494 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
495
496 /*
497 * If we get an error writing out the alternate superblocks,
498 * just issue a warning and continue. The real work is
499 * already done and committed.
500 */
501 error = xfs_bwrite(bp);
502 xfs_buf_relse(bp);
503 if (error) {
504 xfs_warn(mp,
505 "write error %d updating secondary superblock for ag %d",
506 error, agno);
507 break; /* no point in continuing */
508 }
509 }
510 return error;
511
512 error0:
513 xfs_trans_cancel(tp, XFS_TRANS_ABORT);
514 return error;
515 }
516
517 static int
518 xfs_growfs_log_private(
519 xfs_mount_t *mp, /* mount point for filesystem */
520 xfs_growfs_log_t *in) /* growfs log input struct */
521 {
522 xfs_extlen_t nb;
523
524 nb = in->newblocks;
525 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
526 return XFS_ERROR(EINVAL);
527 if (nb == mp->m_sb.sb_logblocks &&
528 in->isint == (mp->m_sb.sb_logstart != 0))
529 return XFS_ERROR(EINVAL);
530 /*
531 * Moving the log is hard, need new interfaces to sync
532 * the log first, hold off all activity while moving it.
533 * Can have shorter or longer log in the same space,
534 * or transform internal to external log or vice versa.
535 */
536 return XFS_ERROR(ENOSYS);
537 }
538
539 /*
540 * protected versions of growfs function acquire and release locks on the mount
541 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
542 * XFS_IOC_FSGROWFSRT
543 */
544
545
546 int
547 xfs_growfs_data(
548 xfs_mount_t *mp,
549 xfs_growfs_data_t *in)
550 {
551 int error;
552
553 if (!capable(CAP_SYS_ADMIN))
554 return XFS_ERROR(EPERM);
555 if (!mutex_trylock(&mp->m_growlock))
556 return XFS_ERROR(EWOULDBLOCK);
557 error = xfs_growfs_data_private(mp, in);
558 mutex_unlock(&mp->m_growlock);
559 return error;
560 }
561
562 int
563 xfs_growfs_log(
564 xfs_mount_t *mp,
565 xfs_growfs_log_t *in)
566 {
567 int error;
568
569 if (!capable(CAP_SYS_ADMIN))
570 return XFS_ERROR(EPERM);
571 if (!mutex_trylock(&mp->m_growlock))
572 return XFS_ERROR(EWOULDBLOCK);
573 error = xfs_growfs_log_private(mp, in);
574 mutex_unlock(&mp->m_growlock);
575 return error;
576 }
577
578 /*
579 * exported through ioctl XFS_IOC_FSCOUNTS
580 */
581
582 int
583 xfs_fs_counts(
584 xfs_mount_t *mp,
585 xfs_fsop_counts_t *cnt)
586 {
587 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
588 spin_lock(&mp->m_sb_lock);
589 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
590 cnt->freertx = mp->m_sb.sb_frextents;
591 cnt->freeino = mp->m_sb.sb_ifree;
592 cnt->allocino = mp->m_sb.sb_icount;
593 spin_unlock(&mp->m_sb_lock);
594 return 0;
595 }
596
597 /*
598 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
599 *
600 * xfs_reserve_blocks is called to set m_resblks
601 * in the in-core mount table. The number of unused reserved blocks
602 * is kept in m_resblks_avail.
603 *
604 * Reserve the requested number of blocks if available. Otherwise return
605 * as many as possible to satisfy the request. The actual number
606 * reserved are returned in outval
607 *
608 * A null inval pointer indicates that only the current reserved blocks
609 * available should be returned no settings are changed.
610 */
611
612 int
613 xfs_reserve_blocks(
614 xfs_mount_t *mp,
615 __uint64_t *inval,
616 xfs_fsop_resblks_t *outval)
617 {
618 __int64_t lcounter, delta, fdblks_delta;
619 __uint64_t request;
620
621 /* If inval is null, report current values and return */
622 if (inval == (__uint64_t *)NULL) {
623 if (!outval)
624 return EINVAL;
625 outval->resblks = mp->m_resblks;
626 outval->resblks_avail = mp->m_resblks_avail;
627 return 0;
628 }
629
630 request = *inval;
631
632 /*
633 * With per-cpu counters, this becomes an interesting
634 * problem. we needto work out if we are freeing or allocation
635 * blocks first, then we can do the modification as necessary.
636 *
637 * We do this under the m_sb_lock so that if we are near
638 * ENOSPC, we will hold out any changes while we work out
639 * what to do. This means that the amount of free space can
640 * change while we do this, so we need to retry if we end up
641 * trying to reserve more space than is available.
642 *
643 * We also use the xfs_mod_incore_sb() interface so that we
644 * don't have to care about whether per cpu counter are
645 * enabled, disabled or even compiled in....
646 */
647 retry:
648 spin_lock(&mp->m_sb_lock);
649 xfs_icsb_sync_counters_locked(mp, 0);
650
651 /*
652 * If our previous reservation was larger than the current value,
653 * then move any unused blocks back to the free pool.
654 */
655 fdblks_delta = 0;
656 if (mp->m_resblks > request) {
657 lcounter = mp->m_resblks_avail - request;
658 if (lcounter > 0) { /* release unused blocks */
659 fdblks_delta = lcounter;
660 mp->m_resblks_avail -= lcounter;
661 }
662 mp->m_resblks = request;
663 } else {
664 __int64_t free;
665
666 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
667 if (!free)
668 goto out; /* ENOSPC and fdblks_delta = 0 */
669
670 delta = request - mp->m_resblks;
671 lcounter = free - delta;
672 if (lcounter < 0) {
673 /* We can't satisfy the request, just get what we can */
674 mp->m_resblks += free;
675 mp->m_resblks_avail += free;
676 fdblks_delta = -free;
677 } else {
678 fdblks_delta = -delta;
679 mp->m_resblks = request;
680 mp->m_resblks_avail += delta;
681 }
682 }
683 out:
684 if (outval) {
685 outval->resblks = mp->m_resblks;
686 outval->resblks_avail = mp->m_resblks_avail;
687 }
688 spin_unlock(&mp->m_sb_lock);
689
690 if (fdblks_delta) {
691 /*
692 * If we are putting blocks back here, m_resblks_avail is
693 * already at its max so this will put it in the free pool.
694 *
695 * If we need space, we'll either succeed in getting it
696 * from the free block count or we'll get an enospc. If
697 * we get a ENOSPC, it means things changed while we were
698 * calculating fdblks_delta and so we should try again to
699 * see if there is anything left to reserve.
700 *
701 * Don't set the reserved flag here - we don't want to reserve
702 * the extra reserve blocks from the reserve.....
703 */
704 int error;
705 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
706 fdblks_delta, 0);
707 if (error == ENOSPC)
708 goto retry;
709 }
710 return 0;
711 }
712
713 /*
714 * Dump a transaction into the log that contains no real change. This is needed
715 * to be able to make the log dirty or stamp the current tail LSN into the log
716 * during the covering operation.
717 *
718 * We cannot use an inode here for this - that will push dirty state back up
719 * into the VFS and then periodic inode flushing will prevent log covering from
720 * making progress. Hence we log a field in the superblock instead and use a
721 * synchronous transaction to ensure the superblock is immediately unpinned
722 * and can be written back.
723 */
724 int
725 xfs_fs_log_dummy(
726 xfs_mount_t *mp)
727 {
728 xfs_trans_t *tp;
729 int error;
730
731 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
732 error = xfs_trans_reserve(tp, 0, XFS_SB_LOG_RES(mp), 0, 0,
733 XFS_DEFAULT_LOG_COUNT);
734 if (error) {
735 xfs_trans_cancel(tp, 0);
736 return error;
737 }
738
739 /* log the UUID because it is an unchanging field */
740 xfs_mod_sb(tp, XFS_SB_UUID);
741 xfs_trans_set_sync(tp);
742 return xfs_trans_commit(tp, 0);
743 }
744
745 int
746 xfs_fs_goingdown(
747 xfs_mount_t *mp,
748 __uint32_t inflags)
749 {
750 switch (inflags) {
751 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
752 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
753
754 if (sb && !IS_ERR(sb)) {
755 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
756 thaw_bdev(sb->s_bdev, sb);
757 }
758
759 break;
760 }
761 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
762 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
763 break;
764 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
765 xfs_force_shutdown(mp,
766 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
767 break;
768 default:
769 return XFS_ERROR(EINVAL);
770 }
771
772 return 0;
773 }
774
775 /*
776 * Force a shutdown of the filesystem instantly while keeping the filesystem
777 * consistent. We don't do an unmount here; just shutdown the shop, make sure
778 * that absolutely nothing persistent happens to this filesystem after this
779 * point.
780 */
781 void
782 xfs_do_force_shutdown(
783 xfs_mount_t *mp,
784 int flags,
785 char *fname,
786 int lnnum)
787 {
788 int logerror;
789
790 logerror = flags & SHUTDOWN_LOG_IO_ERROR;
791
792 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
793 xfs_notice(mp,
794 "%s(0x%x) called from line %d of file %s. Return address = 0x%p",
795 __func__, flags, lnnum, fname, __return_address);
796 }
797 /*
798 * No need to duplicate efforts.
799 */
800 if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
801 return;
802
803 /*
804 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
805 * queue up anybody new on the log reservations, and wakes up
806 * everybody who's sleeping on log reservations to tell them
807 * the bad news.
808 */
809 if (xfs_log_force_umount(mp, logerror))
810 return;
811
812 if (flags & SHUTDOWN_CORRUPT_INCORE) {
813 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
814 "Corruption of in-memory data detected. Shutting down filesystem");
815 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
816 xfs_stack_trace();
817 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
818 if (logerror) {
819 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
820 "Log I/O Error Detected. Shutting down filesystem");
821 } else if (flags & SHUTDOWN_DEVICE_REQ) {
822 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
823 "All device paths lost. Shutting down filesystem");
824 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
825 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
826 "I/O Error Detected. Shutting down filesystem");
827 }
828 }
829 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
830 xfs_alert(mp,
831 "Please umount the filesystem and rectify the problem(s)");
832 }
833 }
Linux kernel - Deliverables
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