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xfs: don't break from growfs ag update loop on error
[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 (xfs_sb_version_hascrc(&mp->m_sb) ?
104 XFS_FSOP_GEOM_FLAGS_V5SB : 0) |
105 (xfs_sb_version_hasftype(&mp->m_sb) ?
106 XFS_FSOP_GEOM_FLAGS_FTYPE : 0);
107 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
108 mp->m_sb.sb_logsectsize : BBSIZE;
109 geo->rtsectsize = mp->m_sb.sb_blocksize;
110 geo->dirblocksize = mp->m_dirblksize;
111 }
112 if (new_version >= 4) {
113 geo->flags |=
114 (xfs_sb_version_haslogv2(&mp->m_sb) ?
115 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
116 geo->logsunit = mp->m_sb.sb_logsunit;
117 }
118 return 0;
119 }
120
121 static struct xfs_buf *
122 xfs_growfs_get_hdr_buf(
123 struct xfs_mount *mp,
124 xfs_daddr_t blkno,
125 size_t numblks,
126 int flags,
127 const struct xfs_buf_ops *ops)
128 {
129 struct xfs_buf *bp;
130
131 bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
132 if (!bp)
133 return NULL;
134
135 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
136 bp->b_bn = blkno;
137 bp->b_maps[0].bm_bn = blkno;
138 bp->b_ops = ops;
139
140 return bp;
141 }
142
143 static int
144 xfs_growfs_data_private(
145 xfs_mount_t *mp, /* mount point for filesystem */
146 xfs_growfs_data_t *in) /* growfs data input struct */
147 {
148 xfs_agf_t *agf;
149 struct xfs_agfl *agfl;
150 xfs_agi_t *agi;
151 xfs_agnumber_t agno;
152 xfs_extlen_t agsize;
153 xfs_extlen_t tmpsize;
154 xfs_alloc_rec_t *arec;
155 xfs_buf_t *bp;
156 int bucket;
157 int dpct;
158 int error, saved_error = 0;
159 xfs_agnumber_t nagcount;
160 xfs_agnumber_t nagimax = 0;
161 xfs_rfsblock_t nb, nb_mod;
162 xfs_rfsblock_t new;
163 xfs_rfsblock_t nfree;
164 xfs_agnumber_t oagcount;
165 int pct;
166 xfs_trans_t *tp;
167
168 nb = in->newblocks;
169 pct = in->imaxpct;
170 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
171 return XFS_ERROR(EINVAL);
172 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
173 return error;
174 dpct = pct - mp->m_sb.sb_imax_pct;
175 bp = xfs_buf_read_uncached(mp->m_ddev_targp,
176 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
177 XFS_FSS_TO_BB(mp, 1), 0, NULL);
178 if (!bp)
179 return EIO;
180 if (bp->b_error) {
181 error = bp->b_error;
182 xfs_buf_relse(bp);
183 return error;
184 }
185 xfs_buf_relse(bp);
186
187 new = nb; /* use new as a temporary here */
188 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
189 nagcount = new + (nb_mod != 0);
190 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
191 nagcount--;
192 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
193 if (nb < mp->m_sb.sb_dblocks)
194 return XFS_ERROR(EINVAL);
195 }
196 new = nb - mp->m_sb.sb_dblocks;
197 oagcount = mp->m_sb.sb_agcount;
198
199 /* allocate the new per-ag structures */
200 if (nagcount > oagcount) {
201 error = xfs_initialize_perag(mp, nagcount, &nagimax);
202 if (error)
203 return error;
204 }
205
206 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
207 tp->t_flags |= XFS_TRANS_RESERVE;
208 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growdata,
209 XFS_GROWFS_SPACE_RES(mp), 0);
210 if (error) {
211 xfs_trans_cancel(tp, 0);
212 return error;
213 }
214
215 /*
216 * Write new AG headers to disk. Non-transactional, but written
217 * synchronously so they are completed prior to the growfs transaction
218 * being logged.
219 */
220 nfree = 0;
221 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
222 /*
223 * AG freespace header block
224 */
225 bp = xfs_growfs_get_hdr_buf(mp,
226 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
227 XFS_FSS_TO_BB(mp, 1), 0,
228 &xfs_agf_buf_ops);
229 if (!bp) {
230 error = ENOMEM;
231 goto error0;
232 }
233
234 agf = XFS_BUF_TO_AGF(bp);
235 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
236 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
237 agf->agf_seqno = cpu_to_be32(agno);
238 if (agno == nagcount - 1)
239 agsize =
240 nb -
241 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
242 else
243 agsize = mp->m_sb.sb_agblocks;
244 agf->agf_length = cpu_to_be32(agsize);
245 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
246 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
247 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
248 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
249 agf->agf_flfirst = 0;
250 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
251 agf->agf_flcount = 0;
252 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
253 agf->agf_freeblks = cpu_to_be32(tmpsize);
254 agf->agf_longest = cpu_to_be32(tmpsize);
255 if (xfs_sb_version_hascrc(&mp->m_sb))
256 uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_uuid);
257
258 error = xfs_bwrite(bp);
259 xfs_buf_relse(bp);
260 if (error)
261 goto error0;
262
263 /*
264 * AG freelist header block
265 */
266 bp = xfs_growfs_get_hdr_buf(mp,
267 XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)),
268 XFS_FSS_TO_BB(mp, 1), 0,
269 &xfs_agfl_buf_ops);
270 if (!bp) {
271 error = ENOMEM;
272 goto error0;
273 }
274
275 agfl = XFS_BUF_TO_AGFL(bp);
276 if (xfs_sb_version_hascrc(&mp->m_sb)) {
277 agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
278 agfl->agfl_seqno = cpu_to_be32(agno);
279 uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_uuid);
280 }
281 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
282 agfl->agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
283
284 error = xfs_bwrite(bp);
285 xfs_buf_relse(bp);
286 if (error)
287 goto error0;
288
289 /*
290 * AG inode header block
291 */
292 bp = xfs_growfs_get_hdr_buf(mp,
293 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
294 XFS_FSS_TO_BB(mp, 1), 0,
295 &xfs_agi_buf_ops);
296 if (!bp) {
297 error = ENOMEM;
298 goto error0;
299 }
300
301 agi = XFS_BUF_TO_AGI(bp);
302 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
303 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
304 agi->agi_seqno = cpu_to_be32(agno);
305 agi->agi_length = cpu_to_be32(agsize);
306 agi->agi_count = 0;
307 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
308 agi->agi_level = cpu_to_be32(1);
309 agi->agi_freecount = 0;
310 agi->agi_newino = cpu_to_be32(NULLAGINO);
311 agi->agi_dirino = cpu_to_be32(NULLAGINO);
312 if (xfs_sb_version_hascrc(&mp->m_sb))
313 uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_uuid);
314 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
315 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
316
317 error = xfs_bwrite(bp);
318 xfs_buf_relse(bp);
319 if (error)
320 goto error0;
321
322 /*
323 * BNO btree root block
324 */
325 bp = xfs_growfs_get_hdr_buf(mp,
326 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
327 BTOBB(mp->m_sb.sb_blocksize), 0,
328 &xfs_allocbt_buf_ops);
329
330 if (!bp) {
331 error = ENOMEM;
332 goto error0;
333 }
334
335 if (xfs_sb_version_hascrc(&mp->m_sb))
336 xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1,
337 agno, XFS_BTREE_CRC_BLOCKS);
338 else
339 xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1,
340 agno, 0);
341
342 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
343 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
344 arec->ar_blockcount = cpu_to_be32(
345 agsize - be32_to_cpu(arec->ar_startblock));
346
347 error = xfs_bwrite(bp);
348 xfs_buf_relse(bp);
349 if (error)
350 goto error0;
351
352 /*
353 * CNT btree root block
354 */
355 bp = xfs_growfs_get_hdr_buf(mp,
356 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
357 BTOBB(mp->m_sb.sb_blocksize), 0,
358 &xfs_allocbt_buf_ops);
359 if (!bp) {
360 error = ENOMEM;
361 goto error0;
362 }
363
364 if (xfs_sb_version_hascrc(&mp->m_sb))
365 xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1,
366 agno, XFS_BTREE_CRC_BLOCKS);
367 else
368 xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1,
369 agno, 0);
370
371 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
372 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
373 arec->ar_blockcount = cpu_to_be32(
374 agsize - be32_to_cpu(arec->ar_startblock));
375 nfree += be32_to_cpu(arec->ar_blockcount);
376
377 error = xfs_bwrite(bp);
378 xfs_buf_relse(bp);
379 if (error)
380 goto error0;
381
382 /*
383 * INO btree root block
384 */
385 bp = xfs_growfs_get_hdr_buf(mp,
386 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
387 BTOBB(mp->m_sb.sb_blocksize), 0,
388 &xfs_inobt_buf_ops);
389 if (!bp) {
390 error = ENOMEM;
391 goto error0;
392 }
393
394 if (xfs_sb_version_hascrc(&mp->m_sb))
395 xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0,
396 agno, XFS_BTREE_CRC_BLOCKS);
397 else
398 xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0,
399 agno, 0);
400
401 error = xfs_bwrite(bp);
402 xfs_buf_relse(bp);
403 if (error)
404 goto error0;
405 }
406 xfs_trans_agblocks_delta(tp, nfree);
407 /*
408 * There are new blocks in the old last a.g.
409 */
410 if (new) {
411 /*
412 * Change the agi length.
413 */
414 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
415 if (error) {
416 goto error0;
417 }
418 ASSERT(bp);
419 agi = XFS_BUF_TO_AGI(bp);
420 be32_add_cpu(&agi->agi_length, new);
421 ASSERT(nagcount == oagcount ||
422 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
423 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
424 /*
425 * Change agf length.
426 */
427 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
428 if (error) {
429 goto error0;
430 }
431 ASSERT(bp);
432 agf = XFS_BUF_TO_AGF(bp);
433 be32_add_cpu(&agf->agf_length, new);
434 ASSERT(be32_to_cpu(agf->agf_length) ==
435 be32_to_cpu(agi->agi_length));
436
437 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
438 /*
439 * Free the new space.
440 */
441 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
442 be32_to_cpu(agf->agf_length) - new), new);
443 if (error) {
444 goto error0;
445 }
446 }
447
448 /*
449 * Update changed superblock fields transactionally. These are not
450 * seen by the rest of the world until the transaction commit applies
451 * them atomically to the superblock.
452 */
453 if (nagcount > oagcount)
454 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
455 if (nb > mp->m_sb.sb_dblocks)
456 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
457 nb - mp->m_sb.sb_dblocks);
458 if (nfree)
459 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
460 if (dpct)
461 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
462 error = xfs_trans_commit(tp, 0);
463 if (error)
464 return error;
465
466 /* New allocation groups fully initialized, so update mount struct */
467 if (nagimax)
468 mp->m_maxagi = nagimax;
469 if (mp->m_sb.sb_imax_pct) {
470 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
471 do_div(icount, 100);
472 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
473 } else
474 mp->m_maxicount = 0;
475 xfs_set_low_space_thresholds(mp);
476
477 /* update secondary superblocks. */
478 for (agno = 1; agno < nagcount; agno++) {
479 error = 0;
480 /*
481 * new secondary superblocks need to be zeroed, not read from
482 * disk as the contents of the new area we are growing into is
483 * completely unknown.
484 */
485 if (agno < oagcount) {
486 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
487 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
488 XFS_FSS_TO_BB(mp, 1), 0, &bp,
489 &xfs_sb_buf_ops);
490 } else {
491 bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
492 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
493 XFS_FSS_TO_BB(mp, 1), 0);
494 if (bp) {
495 bp->b_ops = &xfs_sb_buf_ops;
496 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
497 } else
498 error = ENOMEM;
499 }
500
501 /*
502 * If we get an error reading or writing alternate superblocks,
503 * continue. xfs_repair chooses the "best" superblock based
504 * on most matches; if we break early, we'll leave more
505 * superblocks un-updated than updated, and xfs_repair may
506 * pick them over the properly-updated primary.
507 */
508 if (error) {
509 xfs_warn(mp,
510 "error %d reading secondary superblock for ag %d",
511 error, agno);
512 saved_error = error;
513 continue;
514 }
515 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
516
517 error = xfs_bwrite(bp);
518 xfs_buf_relse(bp);
519 if (error) {
520 xfs_warn(mp,
521 "write error %d updating secondary superblock for ag %d",
522 error, agno);
523 saved_error = error;
524 continue;
525 }
526 }
527 return saved_error ? saved_error : error;
528
529 error0:
530 xfs_trans_cancel(tp, XFS_TRANS_ABORT);
531 return error;
532 }
533
534 static int
535 xfs_growfs_log_private(
536 xfs_mount_t *mp, /* mount point for filesystem */
537 xfs_growfs_log_t *in) /* growfs log input struct */
538 {
539 xfs_extlen_t nb;
540
541 nb = in->newblocks;
542 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
543 return XFS_ERROR(EINVAL);
544 if (nb == mp->m_sb.sb_logblocks &&
545 in->isint == (mp->m_sb.sb_logstart != 0))
546 return XFS_ERROR(EINVAL);
547 /*
548 * Moving the log is hard, need new interfaces to sync
549 * the log first, hold off all activity while moving it.
550 * Can have shorter or longer log in the same space,
551 * or transform internal to external log or vice versa.
552 */
553 return XFS_ERROR(ENOSYS);
554 }
555
556 /*
557 * protected versions of growfs function acquire and release locks on the mount
558 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
559 * XFS_IOC_FSGROWFSRT
560 */
561
562
563 int
564 xfs_growfs_data(
565 xfs_mount_t *mp,
566 xfs_growfs_data_t *in)
567 {
568 int error;
569
570 if (!capable(CAP_SYS_ADMIN))
571 return XFS_ERROR(EPERM);
572 if (!mutex_trylock(&mp->m_growlock))
573 return XFS_ERROR(EWOULDBLOCK);
574 error = xfs_growfs_data_private(mp, in);
575 mutex_unlock(&mp->m_growlock);
576 return error;
577 }
578
579 int
580 xfs_growfs_log(
581 xfs_mount_t *mp,
582 xfs_growfs_log_t *in)
583 {
584 int error;
585
586 if (!capable(CAP_SYS_ADMIN))
587 return XFS_ERROR(EPERM);
588 if (!mutex_trylock(&mp->m_growlock))
589 return XFS_ERROR(EWOULDBLOCK);
590 error = xfs_growfs_log_private(mp, in);
591 mutex_unlock(&mp->m_growlock);
592 return error;
593 }
594
595 /*
596 * exported through ioctl XFS_IOC_FSCOUNTS
597 */
598
599 int
600 xfs_fs_counts(
601 xfs_mount_t *mp,
602 xfs_fsop_counts_t *cnt)
603 {
604 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
605 spin_lock(&mp->m_sb_lock);
606 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
607 cnt->freertx = mp->m_sb.sb_frextents;
608 cnt->freeino = mp->m_sb.sb_ifree;
609 cnt->allocino = mp->m_sb.sb_icount;
610 spin_unlock(&mp->m_sb_lock);
611 return 0;
612 }
613
614 /*
615 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
616 *
617 * xfs_reserve_blocks is called to set m_resblks
618 * in the in-core mount table. The number of unused reserved blocks
619 * is kept in m_resblks_avail.
620 *
621 * Reserve the requested number of blocks if available. Otherwise return
622 * as many as possible to satisfy the request. The actual number
623 * reserved are returned in outval
624 *
625 * A null inval pointer indicates that only the current reserved blocks
626 * available should be returned no settings are changed.
627 */
628
629 int
630 xfs_reserve_blocks(
631 xfs_mount_t *mp,
632 __uint64_t *inval,
633 xfs_fsop_resblks_t *outval)
634 {
635 __int64_t lcounter, delta, fdblks_delta;
636 __uint64_t request;
637
638 /* If inval is null, report current values and return */
639 if (inval == (__uint64_t *)NULL) {
640 if (!outval)
641 return EINVAL;
642 outval->resblks = mp->m_resblks;
643 outval->resblks_avail = mp->m_resblks_avail;
644 return 0;
645 }
646
647 request = *inval;
648
649 /*
650 * With per-cpu counters, this becomes an interesting
651 * problem. we needto work out if we are freeing or allocation
652 * blocks first, then we can do the modification as necessary.
653 *
654 * We do this under the m_sb_lock so that if we are near
655 * ENOSPC, we will hold out any changes while we work out
656 * what to do. This means that the amount of free space can
657 * change while we do this, so we need to retry if we end up
658 * trying to reserve more space than is available.
659 *
660 * We also use the xfs_mod_incore_sb() interface so that we
661 * don't have to care about whether per cpu counter are
662 * enabled, disabled or even compiled in....
663 */
664 retry:
665 spin_lock(&mp->m_sb_lock);
666 xfs_icsb_sync_counters_locked(mp, 0);
667
668 /*
669 * If our previous reservation was larger than the current value,
670 * then move any unused blocks back to the free pool.
671 */
672 fdblks_delta = 0;
673 if (mp->m_resblks > request) {
674 lcounter = mp->m_resblks_avail - request;
675 if (lcounter > 0) { /* release unused blocks */
676 fdblks_delta = lcounter;
677 mp->m_resblks_avail -= lcounter;
678 }
679 mp->m_resblks = request;
680 } else {
681 __int64_t free;
682
683 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
684 if (!free)
685 goto out; /* ENOSPC and fdblks_delta = 0 */
686
687 delta = request - mp->m_resblks;
688 lcounter = free - delta;
689 if (lcounter < 0) {
690 /* We can't satisfy the request, just get what we can */
691 mp->m_resblks += free;
692 mp->m_resblks_avail += free;
693 fdblks_delta = -free;
694 } else {
695 fdblks_delta = -delta;
696 mp->m_resblks = request;
697 mp->m_resblks_avail += delta;
698 }
699 }
700 out:
701 if (outval) {
702 outval->resblks = mp->m_resblks;
703 outval->resblks_avail = mp->m_resblks_avail;
704 }
705 spin_unlock(&mp->m_sb_lock);
706
707 if (fdblks_delta) {
708 /*
709 * If we are putting blocks back here, m_resblks_avail is
710 * already at its max so this will put it in the free pool.
711 *
712 * If we need space, we'll either succeed in getting it
713 * from the free block count or we'll get an enospc. If
714 * we get a ENOSPC, it means things changed while we were
715 * calculating fdblks_delta and so we should try again to
716 * see if there is anything left to reserve.
717 *
718 * Don't set the reserved flag here - we don't want to reserve
719 * the extra reserve blocks from the reserve.....
720 */
721 int error;
722 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
723 fdblks_delta, 0);
724 if (error == ENOSPC)
725 goto retry;
726 }
727 return 0;
728 }
729
730 /*
731 * Dump a transaction into the log that contains no real change. This is needed
732 * to be able to make the log dirty or stamp the current tail LSN into the log
733 * during the covering operation.
734 *
735 * We cannot use an inode here for this - that will push dirty state back up
736 * into the VFS and then periodic inode flushing will prevent log covering from
737 * making progress. Hence we log a field in the superblock instead and use a
738 * synchronous transaction to ensure the superblock is immediately unpinned
739 * and can be written back.
740 */
741 int
742 xfs_fs_log_dummy(
743 xfs_mount_t *mp)
744 {
745 xfs_trans_t *tp;
746 int error;
747
748 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
749 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_sb, 0, 0);
750 if (error) {
751 xfs_trans_cancel(tp, 0);
752 return error;
753 }
754
755 /* log the UUID because it is an unchanging field */
756 xfs_mod_sb(tp, XFS_SB_UUID);
757 xfs_trans_set_sync(tp);
758 return xfs_trans_commit(tp, 0);
759 }
760
761 int
762 xfs_fs_goingdown(
763 xfs_mount_t *mp,
764 __uint32_t inflags)
765 {
766 switch (inflags) {
767 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
768 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
769
770 if (sb && !IS_ERR(sb)) {
771 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
772 thaw_bdev(sb->s_bdev, sb);
773 }
774
775 break;
776 }
777 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
778 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
779 break;
780 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
781 xfs_force_shutdown(mp,
782 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
783 break;
784 default:
785 return XFS_ERROR(EINVAL);
786 }
787
788 return 0;
789 }
790
791 /*
792 * Force a shutdown of the filesystem instantly while keeping the filesystem
793 * consistent. We don't do an unmount here; just shutdown the shop, make sure
794 * that absolutely nothing persistent happens to this filesystem after this
795 * point.
796 */
797 void
798 xfs_do_force_shutdown(
799 xfs_mount_t *mp,
800 int flags,
801 char *fname,
802 int lnnum)
803 {
804 int logerror;
805
806 logerror = flags & SHUTDOWN_LOG_IO_ERROR;
807
808 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
809 xfs_notice(mp,
810 "%s(0x%x) called from line %d of file %s. Return address = 0x%p",
811 __func__, flags, lnnum, fname, __return_address);
812 }
813 /*
814 * No need to duplicate efforts.
815 */
816 if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
817 return;
818
819 /*
820 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
821 * queue up anybody new on the log reservations, and wakes up
822 * everybody who's sleeping on log reservations to tell them
823 * the bad news.
824 */
825 if (xfs_log_force_umount(mp, logerror))
826 return;
827
828 if (flags & SHUTDOWN_CORRUPT_INCORE) {
829 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
830 "Corruption of in-memory data detected. Shutting down filesystem");
831 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
832 xfs_stack_trace();
833 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
834 if (logerror) {
835 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
836 "Log I/O Error Detected. Shutting down filesystem");
837 } else if (flags & SHUTDOWN_DEVICE_REQ) {
838 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
839 "All device paths lost. Shutting down filesystem");
840 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
841 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
842 "I/O Error Detected. Shutting down filesystem");
843 }
844 }
845 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
846 xfs_alert(mp,
847 "Please umount the filesystem and rectify the problem(s)");
848 }
849 }
Linux kernel - Deliverables
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