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xfs: check xfs_buf_read_uncached returns correctly
[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_shared.h"
21 #include "xfs_format.h"
22 #include "xfs_log_format.h"
23 #include "xfs_trans_resv.h"
24 #include "xfs_sb.h"
25 #include "xfs_ag.h"
26 #include "xfs_mount.h"
27 #include "xfs_da_format.h"
28 #include "xfs_da_btree.h"
29 #include "xfs_inode.h"
30 #include "xfs_trans.h"
31 #include "xfs_inode_item.h"
32 #include "xfs_error.h"
33 #include "xfs_btree.h"
34 #include "xfs_alloc_btree.h"
35 #include "xfs_alloc.h"
36 #include "xfs_ialloc.h"
37 #include "xfs_fsops.h"
38 #include "xfs_itable.h"
39 #include "xfs_trans_space.h"
40 #include "xfs_rtalloc.h"
41 #include "xfs_trace.h"
42 #include "xfs_log.h"
43 #include "xfs_dinode.h"
44 #include "xfs_filestream.h"
45
46 /*
47 * File system operations
48 */
49
50 int
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 = XFS_FSOP_GEOM_FLAGS_NLINK |
80 XFS_FSOP_GEOM_FLAGS_DIRV2 |
81 (xfs_sb_version_hasattr(&mp->m_sb) ?
82 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
83 (xfs_sb_version_hasquota(&mp->m_sb) ?
84 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
85 (xfs_sb_version_hasalign(&mp->m_sb) ?
86 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
87 (xfs_sb_version_hasdalign(&mp->m_sb) ?
88 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
89 (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
90 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
91 (xfs_sb_version_hassector(&mp->m_sb) ?
92 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
93 (xfs_sb_version_hasasciici(&mp->m_sb) ?
94 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
95 (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
96 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
97 (xfs_sb_version_hasattr2(&mp->m_sb) ?
98 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) |
99 (xfs_sb_version_hasprojid32bit(&mp->m_sb) ?
100 XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) |
101 (xfs_sb_version_hascrc(&mp->m_sb) ?
102 XFS_FSOP_GEOM_FLAGS_V5SB : 0) |
103 (xfs_sb_version_hasftype(&mp->m_sb) ?
104 XFS_FSOP_GEOM_FLAGS_FTYPE : 0) |
105 (xfs_sb_version_hasfinobt(&mp->m_sb) ?
106 XFS_FSOP_GEOM_FLAGS_FINOBT : 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_dir_geo->blksize;
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 -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 error = 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, &bp, NULL);
178 if (error)
179 return error;
180 xfs_buf_relse(bp);
181
182 new = nb; /* use new as a temporary here */
183 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
184 nagcount = new + (nb_mod != 0);
185 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
186 nagcount--;
187 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
188 if (nb < mp->m_sb.sb_dblocks)
189 return -EINVAL;
190 }
191 new = nb - mp->m_sb.sb_dblocks;
192 oagcount = mp->m_sb.sb_agcount;
193
194 /* allocate the new per-ag structures */
195 if (nagcount > oagcount) {
196 error = xfs_initialize_perag(mp, nagcount, &nagimax);
197 if (error)
198 return error;
199 }
200
201 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
202 tp->t_flags |= XFS_TRANS_RESERVE;
203 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growdata,
204 XFS_GROWFS_SPACE_RES(mp), 0);
205 if (error) {
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 __be32 *agfl_bno;
218
219 /*
220 * AG freespace header block
221 */
222 bp = xfs_growfs_get_hdr_buf(mp,
223 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
224 XFS_FSS_TO_BB(mp, 1), 0,
225 &xfs_agf_buf_ops);
226 if (!bp) {
227 error = -ENOMEM;
228 goto error0;
229 }
230
231 agf = XFS_BUF_TO_AGF(bp);
232 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
233 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
234 agf->agf_seqno = cpu_to_be32(agno);
235 if (agno == nagcount - 1)
236 agsize =
237 nb -
238 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
239 else
240 agsize = mp->m_sb.sb_agblocks;
241 agf->agf_length = cpu_to_be32(agsize);
242 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
243 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
244 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
245 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
246 agf->agf_flfirst = 0;
247 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
248 agf->agf_flcount = 0;
249 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
250 agf->agf_freeblks = cpu_to_be32(tmpsize);
251 agf->agf_longest = cpu_to_be32(tmpsize);
252 if (xfs_sb_version_hascrc(&mp->m_sb))
253 uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_uuid);
254
255 error = xfs_bwrite(bp);
256 xfs_buf_relse(bp);
257 if (error)
258 goto error0;
259
260 /*
261 * AG freelist header block
262 */
263 bp = xfs_growfs_get_hdr_buf(mp,
264 XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)),
265 XFS_FSS_TO_BB(mp, 1), 0,
266 &xfs_agfl_buf_ops);
267 if (!bp) {
268 error = -ENOMEM;
269 goto error0;
270 }
271
272 agfl = XFS_BUF_TO_AGFL(bp);
273 if (xfs_sb_version_hascrc(&mp->m_sb)) {
274 agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
275 agfl->agfl_seqno = cpu_to_be32(agno);
276 uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_uuid);
277 }
278
279 agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
280 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
281 agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
282
283 error = xfs_bwrite(bp);
284 xfs_buf_relse(bp);
285 if (error)
286 goto error0;
287
288 /*
289 * AG inode header block
290 */
291 bp = xfs_growfs_get_hdr_buf(mp,
292 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
293 XFS_FSS_TO_BB(mp, 1), 0,
294 &xfs_agi_buf_ops);
295 if (!bp) {
296 error = -ENOMEM;
297 goto error0;
298 }
299
300 agi = XFS_BUF_TO_AGI(bp);
301 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
302 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
303 agi->agi_seqno = cpu_to_be32(agno);
304 agi->agi_length = cpu_to_be32(agsize);
305 agi->agi_count = 0;
306 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
307 agi->agi_level = cpu_to_be32(1);
308 agi->agi_freecount = 0;
309 agi->agi_newino = cpu_to_be32(NULLAGINO);
310 agi->agi_dirino = cpu_to_be32(NULLAGINO);
311 if (xfs_sb_version_hascrc(&mp->m_sb))
312 uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_uuid);
313 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
314 agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp));
315 agi->agi_free_level = cpu_to_be32(1);
316 }
317 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
318 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
319
320 error = xfs_bwrite(bp);
321 xfs_buf_relse(bp);
322 if (error)
323 goto error0;
324
325 /*
326 * BNO btree root block
327 */
328 bp = xfs_growfs_get_hdr_buf(mp,
329 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
330 BTOBB(mp->m_sb.sb_blocksize), 0,
331 &xfs_allocbt_buf_ops);
332
333 if (!bp) {
334 error = -ENOMEM;
335 goto error0;
336 }
337
338 if (xfs_sb_version_hascrc(&mp->m_sb))
339 xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1,
340 agno, XFS_BTREE_CRC_BLOCKS);
341 else
342 xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1,
343 agno, 0);
344
345 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
346 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
347 arec->ar_blockcount = cpu_to_be32(
348 agsize - be32_to_cpu(arec->ar_startblock));
349
350 error = xfs_bwrite(bp);
351 xfs_buf_relse(bp);
352 if (error)
353 goto error0;
354
355 /*
356 * CNT btree root block
357 */
358 bp = xfs_growfs_get_hdr_buf(mp,
359 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
360 BTOBB(mp->m_sb.sb_blocksize), 0,
361 &xfs_allocbt_buf_ops);
362 if (!bp) {
363 error = -ENOMEM;
364 goto error0;
365 }
366
367 if (xfs_sb_version_hascrc(&mp->m_sb))
368 xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1,
369 agno, XFS_BTREE_CRC_BLOCKS);
370 else
371 xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1,
372 agno, 0);
373
374 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
375 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
376 arec->ar_blockcount = cpu_to_be32(
377 agsize - be32_to_cpu(arec->ar_startblock));
378 nfree += be32_to_cpu(arec->ar_blockcount);
379
380 error = xfs_bwrite(bp);
381 xfs_buf_relse(bp);
382 if (error)
383 goto error0;
384
385 /*
386 * INO btree root block
387 */
388 bp = xfs_growfs_get_hdr_buf(mp,
389 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
390 BTOBB(mp->m_sb.sb_blocksize), 0,
391 &xfs_inobt_buf_ops);
392 if (!bp) {
393 error = -ENOMEM;
394 goto error0;
395 }
396
397 if (xfs_sb_version_hascrc(&mp->m_sb))
398 xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0,
399 agno, XFS_BTREE_CRC_BLOCKS);
400 else
401 xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0,
402 agno, 0);
403
404 error = xfs_bwrite(bp);
405 xfs_buf_relse(bp);
406 if (error)
407 goto error0;
408
409 /*
410 * FINO btree root block
411 */
412 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
413 bp = xfs_growfs_get_hdr_buf(mp,
414 XFS_AGB_TO_DADDR(mp, agno, XFS_FIBT_BLOCK(mp)),
415 BTOBB(mp->m_sb.sb_blocksize), 0,
416 &xfs_inobt_buf_ops);
417 if (!bp) {
418 error = -ENOMEM;
419 goto error0;
420 }
421
422 if (xfs_sb_version_hascrc(&mp->m_sb))
423 xfs_btree_init_block(mp, bp, XFS_FIBT_CRC_MAGIC,
424 0, 0, agno,
425 XFS_BTREE_CRC_BLOCKS);
426 else
427 xfs_btree_init_block(mp, bp, XFS_FIBT_MAGIC, 0,
428 0, agno, 0);
429
430 error = xfs_bwrite(bp);
431 xfs_buf_relse(bp);
432 if (error)
433 goto error0;
434 }
435
436 }
437 xfs_trans_agblocks_delta(tp, nfree);
438 /*
439 * There are new blocks in the old last a.g.
440 */
441 if (new) {
442 /*
443 * Change the agi length.
444 */
445 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
446 if (error) {
447 goto error0;
448 }
449 ASSERT(bp);
450 agi = XFS_BUF_TO_AGI(bp);
451 be32_add_cpu(&agi->agi_length, new);
452 ASSERT(nagcount == oagcount ||
453 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
454 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
455 /*
456 * Change agf length.
457 */
458 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
459 if (error) {
460 goto error0;
461 }
462 ASSERT(bp);
463 agf = XFS_BUF_TO_AGF(bp);
464 be32_add_cpu(&agf->agf_length, new);
465 ASSERT(be32_to_cpu(agf->agf_length) ==
466 be32_to_cpu(agi->agi_length));
467
468 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
469 /*
470 * Free the new space.
471 */
472 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
473 be32_to_cpu(agf->agf_length) - new), new);
474 if (error) {
475 goto error0;
476 }
477 }
478
479 /*
480 * Update changed superblock fields transactionally. These are not
481 * seen by the rest of the world until the transaction commit applies
482 * them atomically to the superblock.
483 */
484 if (nagcount > oagcount)
485 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
486 if (nb > mp->m_sb.sb_dblocks)
487 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
488 nb - mp->m_sb.sb_dblocks);
489 if (nfree)
490 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
491 if (dpct)
492 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
493 error = xfs_trans_commit(tp, 0);
494 if (error)
495 return error;
496
497 /* New allocation groups fully initialized, so update mount struct */
498 if (nagimax)
499 mp->m_maxagi = nagimax;
500 if (mp->m_sb.sb_imax_pct) {
501 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
502 do_div(icount, 100);
503 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
504 } else
505 mp->m_maxicount = 0;
506 xfs_set_low_space_thresholds(mp);
507
508 /* update secondary superblocks. */
509 for (agno = 1; agno < nagcount; agno++) {
510 error = 0;
511 /*
512 * new secondary superblocks need to be zeroed, not read from
513 * disk as the contents of the new area we are growing into is
514 * completely unknown.
515 */
516 if (agno < oagcount) {
517 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
518 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
519 XFS_FSS_TO_BB(mp, 1), 0, &bp,
520 &xfs_sb_buf_ops);
521 } else {
522 bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
523 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
524 XFS_FSS_TO_BB(mp, 1), 0);
525 if (bp) {
526 bp->b_ops = &xfs_sb_buf_ops;
527 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
528 } else
529 error = -ENOMEM;
530 }
531
532 /*
533 * If we get an error reading or writing alternate superblocks,
534 * continue. xfs_repair chooses the "best" superblock based
535 * on most matches; if we break early, we'll leave more
536 * superblocks un-updated than updated, and xfs_repair may
537 * pick them over the properly-updated primary.
538 */
539 if (error) {
540 xfs_warn(mp,
541 "error %d reading secondary superblock for ag %d",
542 error, agno);
543 saved_error = error;
544 continue;
545 }
546 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
547
548 error = xfs_bwrite(bp);
549 xfs_buf_relse(bp);
550 if (error) {
551 xfs_warn(mp,
552 "write error %d updating secondary superblock for ag %d",
553 error, agno);
554 saved_error = error;
555 continue;
556 }
557 }
558 return saved_error ? saved_error : error;
559
560 error0:
561 xfs_trans_cancel(tp, XFS_TRANS_ABORT);
562 return error;
563 }
564
565 static int
566 xfs_growfs_log_private(
567 xfs_mount_t *mp, /* mount point for filesystem */
568 xfs_growfs_log_t *in) /* growfs log input struct */
569 {
570 xfs_extlen_t nb;
571
572 nb = in->newblocks;
573 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
574 return -EINVAL;
575 if (nb == mp->m_sb.sb_logblocks &&
576 in->isint == (mp->m_sb.sb_logstart != 0))
577 return -EINVAL;
578 /*
579 * Moving the log is hard, need new interfaces to sync
580 * the log first, hold off all activity while moving it.
581 * Can have shorter or longer log in the same space,
582 * or transform internal to external log or vice versa.
583 */
584 return -ENOSYS;
585 }
586
587 /*
588 * protected versions of growfs function acquire and release locks on the mount
589 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
590 * XFS_IOC_FSGROWFSRT
591 */
592
593
594 int
595 xfs_growfs_data(
596 xfs_mount_t *mp,
597 xfs_growfs_data_t *in)
598 {
599 int error;
600
601 if (!capable(CAP_SYS_ADMIN))
602 return -EPERM;
603 if (!mutex_trylock(&mp->m_growlock))
604 return -EWOULDBLOCK;
605 error = xfs_growfs_data_private(mp, in);
606 mutex_unlock(&mp->m_growlock);
607 return error;
608 }
609
610 int
611 xfs_growfs_log(
612 xfs_mount_t *mp,
613 xfs_growfs_log_t *in)
614 {
615 int error;
616
617 if (!capable(CAP_SYS_ADMIN))
618 return -EPERM;
619 if (!mutex_trylock(&mp->m_growlock))
620 return -EWOULDBLOCK;
621 error = xfs_growfs_log_private(mp, in);
622 mutex_unlock(&mp->m_growlock);
623 return error;
624 }
625
626 /*
627 * exported through ioctl XFS_IOC_FSCOUNTS
628 */
629
630 int
631 xfs_fs_counts(
632 xfs_mount_t *mp,
633 xfs_fsop_counts_t *cnt)
634 {
635 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
636 spin_lock(&mp->m_sb_lock);
637 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
638 cnt->freertx = mp->m_sb.sb_frextents;
639 cnt->freeino = mp->m_sb.sb_ifree;
640 cnt->allocino = mp->m_sb.sb_icount;
641 spin_unlock(&mp->m_sb_lock);
642 return 0;
643 }
644
645 /*
646 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
647 *
648 * xfs_reserve_blocks is called to set m_resblks
649 * in the in-core mount table. The number of unused reserved blocks
650 * is kept in m_resblks_avail.
651 *
652 * Reserve the requested number of blocks if available. Otherwise return
653 * as many as possible to satisfy the request. The actual number
654 * reserved are returned in outval
655 *
656 * A null inval pointer indicates that only the current reserved blocks
657 * available should be returned no settings are changed.
658 */
659
660 int
661 xfs_reserve_blocks(
662 xfs_mount_t *mp,
663 __uint64_t *inval,
664 xfs_fsop_resblks_t *outval)
665 {
666 __int64_t lcounter, delta, fdblks_delta;
667 __uint64_t request;
668
669 /* If inval is null, report current values and return */
670 if (inval == (__uint64_t *)NULL) {
671 if (!outval)
672 return -EINVAL;
673 outval->resblks = mp->m_resblks;
674 outval->resblks_avail = mp->m_resblks_avail;
675 return 0;
676 }
677
678 request = *inval;
679
680 /*
681 * With per-cpu counters, this becomes an interesting
682 * problem. we needto work out if we are freeing or allocation
683 * blocks first, then we can do the modification as necessary.
684 *
685 * We do this under the m_sb_lock so that if we are near
686 * ENOSPC, we will hold out any changes while we work out
687 * what to do. This means that the amount of free space can
688 * change while we do this, so we need to retry if we end up
689 * trying to reserve more space than is available.
690 *
691 * We also use the xfs_mod_incore_sb() interface so that we
692 * don't have to care about whether per cpu counter are
693 * enabled, disabled or even compiled in....
694 */
695 retry:
696 spin_lock(&mp->m_sb_lock);
697 xfs_icsb_sync_counters_locked(mp, 0);
698
699 /*
700 * If our previous reservation was larger than the current value,
701 * then move any unused blocks back to the free pool.
702 */
703 fdblks_delta = 0;
704 if (mp->m_resblks > request) {
705 lcounter = mp->m_resblks_avail - request;
706 if (lcounter > 0) { /* release unused blocks */
707 fdblks_delta = lcounter;
708 mp->m_resblks_avail -= lcounter;
709 }
710 mp->m_resblks = request;
711 } else {
712 __int64_t free;
713
714 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
715 if (!free)
716 goto out; /* ENOSPC and fdblks_delta = 0 */
717
718 delta = request - mp->m_resblks;
719 lcounter = free - delta;
720 if (lcounter < 0) {
721 /* We can't satisfy the request, just get what we can */
722 mp->m_resblks += free;
723 mp->m_resblks_avail += free;
724 fdblks_delta = -free;
725 } else {
726 fdblks_delta = -delta;
727 mp->m_resblks = request;
728 mp->m_resblks_avail += delta;
729 }
730 }
731 out:
732 if (outval) {
733 outval->resblks = mp->m_resblks;
734 outval->resblks_avail = mp->m_resblks_avail;
735 }
736 spin_unlock(&mp->m_sb_lock);
737
738 if (fdblks_delta) {
739 /*
740 * If we are putting blocks back here, m_resblks_avail is
741 * already at its max so this will put it in the free pool.
742 *
743 * If we need space, we'll either succeed in getting it
744 * from the free block count or we'll get an enospc. If
745 * we get a ENOSPC, it means things changed while we were
746 * calculating fdblks_delta and so we should try again to
747 * see if there is anything left to reserve.
748 *
749 * Don't set the reserved flag here - we don't want to reserve
750 * the extra reserve blocks from the reserve.....
751 */
752 int error;
753 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
754 fdblks_delta, 0);
755 if (error == -ENOSPC)
756 goto retry;
757 }
758 return 0;
759 }
760
761 /*
762 * Dump a transaction into the log that contains no real change. This is needed
763 * to be able to make the log dirty or stamp the current tail LSN into the log
764 * during the covering operation.
765 *
766 * We cannot use an inode here for this - that will push dirty state back up
767 * into the VFS and then periodic inode flushing will prevent log covering from
768 * making progress. Hence we log a field in the superblock instead and use a
769 * synchronous transaction to ensure the superblock is immediately unpinned
770 * and can be written back.
771 */
772 int
773 xfs_fs_log_dummy(
774 xfs_mount_t *mp)
775 {
776 xfs_trans_t *tp;
777 int error;
778
779 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
780 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_sb, 0, 0);
781 if (error) {
782 xfs_trans_cancel(tp, 0);
783 return error;
784 }
785
786 /* log the UUID because it is an unchanging field */
787 xfs_mod_sb(tp, XFS_SB_UUID);
788 xfs_trans_set_sync(tp);
789 return xfs_trans_commit(tp, 0);
790 }
791
792 int
793 xfs_fs_goingdown(
794 xfs_mount_t *mp,
795 __uint32_t inflags)
796 {
797 switch (inflags) {
798 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
799 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
800
801 if (sb && !IS_ERR(sb)) {
802 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
803 thaw_bdev(sb->s_bdev, sb);
804 }
805
806 break;
807 }
808 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
809 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
810 break;
811 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
812 xfs_force_shutdown(mp,
813 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
814 break;
815 default:
816 return -EINVAL;
817 }
818
819 return 0;
820 }
821
822 /*
823 * Force a shutdown of the filesystem instantly while keeping the filesystem
824 * consistent. We don't do an unmount here; just shutdown the shop, make sure
825 * that absolutely nothing persistent happens to this filesystem after this
826 * point.
827 */
828 void
829 xfs_do_force_shutdown(
830 xfs_mount_t *mp,
831 int flags,
832 char *fname,
833 int lnnum)
834 {
835 int logerror;
836
837 logerror = flags & SHUTDOWN_LOG_IO_ERROR;
838
839 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
840 xfs_notice(mp,
841 "%s(0x%x) called from line %d of file %s. Return address = 0x%p",
842 __func__, flags, lnnum, fname, __return_address);
843 }
844 /*
845 * No need to duplicate efforts.
846 */
847 if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
848 return;
849
850 /*
851 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
852 * queue up anybody new on the log reservations, and wakes up
853 * everybody who's sleeping on log reservations to tell them
854 * the bad news.
855 */
856 if (xfs_log_force_umount(mp, logerror))
857 return;
858
859 if (flags & SHUTDOWN_CORRUPT_INCORE) {
860 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
861 "Corruption of in-memory data detected. Shutting down filesystem");
862 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
863 xfs_stack_trace();
864 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
865 if (logerror) {
866 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
867 "Log I/O Error Detected. Shutting down filesystem");
868 } else if (flags & SHUTDOWN_DEVICE_REQ) {
869 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
870 "All device paths lost. Shutting down filesystem");
871 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
872 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
873 "I/O Error Detected. Shutting down filesystem");
874 }
875 }
876 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
877 xfs_alert(mp,
878 "Please umount the filesystem and rectify the problem(s)");
879 }
880 }
Linux kernel - Deliverables
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