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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
[linux-2.6.git] / fs / xfs / xfs_fsops.c
blob3c3644ea825b65edd813965296aa4c73d6214313
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 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
106 mp->m_sb.sb_logsectsize : BBSIZE;
107 geo->rtsectsize = mp->m_sb.sb_blocksize;
108 geo->dirblocksize = mp->m_dirblksize;
109 }
110 if (new_version >= 4) {
111 geo->flags |=
112 (xfs_sb_version_haslogv2(&mp->m_sb) ?
113 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
114 geo->logsunit = mp->m_sb.sb_logsunit;
115 }
116 return 0;
117 }
118
119 static struct xfs_buf *
120 xfs_growfs_get_hdr_buf(
121 struct xfs_mount *mp,
122 xfs_daddr_t blkno,
123 size_t numblks,
124 int flags,
125 const struct xfs_buf_ops *ops)
126 {
127 struct xfs_buf *bp;
128
129 bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
130 if (!bp)
131 return NULL;
132
133 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
134 bp->b_bn = blkno;
135 bp->b_maps[0].bm_bn = blkno;
136 bp->b_ops = ops;
137
138 return bp;
139 }
140
141 static int
142 xfs_growfs_data_private(
143 xfs_mount_t *mp, /* mount point for filesystem */
144 xfs_growfs_data_t *in) /* growfs data input struct */
145 {
146 xfs_agf_t *agf;
147 struct xfs_agfl *agfl;
148 xfs_agi_t *agi;
149 xfs_agnumber_t agno;
150 xfs_extlen_t agsize;
151 xfs_extlen_t tmpsize;
152 xfs_alloc_rec_t *arec;
153 xfs_buf_t *bp;
154 int bucket;
155 int dpct;
156 int error;
157 xfs_agnumber_t nagcount;
158 xfs_agnumber_t nagimax = 0;
159 xfs_rfsblock_t nb, nb_mod;
160 xfs_rfsblock_t new;
161 xfs_rfsblock_t nfree;
162 xfs_agnumber_t oagcount;
163 int pct;
164 xfs_trans_t *tp;
165
166 nb = in->newblocks;
167 pct = in->imaxpct;
168 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
169 return XFS_ERROR(EINVAL);
170 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
171 return error;
172 dpct = pct - mp->m_sb.sb_imax_pct;
173 bp = xfs_buf_read_uncached(mp->m_ddev_targp,
174 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
175 XFS_FSS_TO_BB(mp, 1), 0, NULL);
176 if (!bp)
177 return EIO;
178 if (bp->b_error) {
179 int error = bp->b_error;
180 xfs_buf_relse(bp);
181 return error;
182 }
183 xfs_buf_relse(bp);
184
185 new = nb; /* use new as a temporary here */
186 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
187 nagcount = new + (nb_mod != 0);
188 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
189 nagcount--;
190 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
191 if (nb < mp->m_sb.sb_dblocks)
192 return XFS_ERROR(EINVAL);
193 }
194 new = nb - mp->m_sb.sb_dblocks;
195 oagcount = mp->m_sb.sb_agcount;
196
197 /* allocate the new per-ag structures */
198 if (nagcount > oagcount) {
199 error = xfs_initialize_perag(mp, nagcount, &nagimax);
200 if (error)
201 return error;
202 }
203
204 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
205 tp->t_flags |= XFS_TRANS_RESERVE;
206 if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
207 XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
208 xfs_trans_cancel(tp, 0);
209 return error;
210 }
211
212 /*
213 * Write new AG headers to disk. Non-transactional, but written
214 * synchronously so they are completed prior to the growfs transaction
215 * being logged.
216 */
217 nfree = 0;
218 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
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 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
279 agfl->agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
280
281 error = xfs_bwrite(bp);
282 xfs_buf_relse(bp);
283 if (error)
284 goto error0;
285
286 /*
287 * AG inode header block
288 */
289 bp = xfs_growfs_get_hdr_buf(mp,
290 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
291 XFS_FSS_TO_BB(mp, 1), 0,
292 &xfs_agi_buf_ops);
293 if (!bp) {
294 error = ENOMEM;
295 goto error0;
296 }
297
298 agi = XFS_BUF_TO_AGI(bp);
299 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
300 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
301 agi->agi_seqno = cpu_to_be32(agno);
302 agi->agi_length = cpu_to_be32(agsize);
303 agi->agi_count = 0;
304 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
305 agi->agi_level = cpu_to_be32(1);
306 agi->agi_freecount = 0;
307 agi->agi_newino = cpu_to_be32(NULLAGINO);
308 agi->agi_dirino = cpu_to_be32(NULLAGINO);
309 if (xfs_sb_version_hascrc(&mp->m_sb))
310 uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_uuid);
311 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
312 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
313
314 error = xfs_bwrite(bp);
315 xfs_buf_relse(bp);
316 if (error)
317 goto error0;
318
319 /*
320 * BNO btree root block
321 */
322 bp = xfs_growfs_get_hdr_buf(mp,
323 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
324 BTOBB(mp->m_sb.sb_blocksize), 0,
325 &xfs_allocbt_buf_ops);
326
327 if (!bp) {
328 error = ENOMEM;
329 goto error0;
330 }
331
332 if (xfs_sb_version_hascrc(&mp->m_sb))
333 xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1,
334 agno, XFS_BTREE_CRC_BLOCKS);
335 else
336 xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1,
337 agno, 0);
338
339 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
340 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
341 arec->ar_blockcount = cpu_to_be32(
342 agsize - be32_to_cpu(arec->ar_startblock));
343
344 error = xfs_bwrite(bp);
345 xfs_buf_relse(bp);
346 if (error)
347 goto error0;
348
349 /*
350 * CNT btree root block
351 */
352 bp = xfs_growfs_get_hdr_buf(mp,
353 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
354 BTOBB(mp->m_sb.sb_blocksize), 0,
355 &xfs_allocbt_buf_ops);
356 if (!bp) {
357 error = ENOMEM;
358 goto error0;
359 }
360
361 if (xfs_sb_version_hascrc(&mp->m_sb))
362 xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1,
363 agno, XFS_BTREE_CRC_BLOCKS);
364 else
365 xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1,
366 agno, 0);
367
368 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
369 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
370 arec->ar_blockcount = cpu_to_be32(
371 agsize - be32_to_cpu(arec->ar_startblock));
372 nfree += be32_to_cpu(arec->ar_blockcount);
373
374 error = xfs_bwrite(bp);
375 xfs_buf_relse(bp);
376 if (error)
377 goto error0;
378
379 /*
380 * INO btree root block
381 */
382 bp = xfs_growfs_get_hdr_buf(mp,
383 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
384 BTOBB(mp->m_sb.sb_blocksize), 0,
385 &xfs_inobt_buf_ops);
386 if (!bp) {
387 error = ENOMEM;
388 goto error0;
389 }
390
391 if (xfs_sb_version_hascrc(&mp->m_sb))
392 xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0,
393 agno, XFS_BTREE_CRC_BLOCKS);
394 else
395 xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0,
396 agno, 0);
397
398 error = xfs_bwrite(bp);
399 xfs_buf_relse(bp);
400 if (error)
401 goto error0;
402 }
403 xfs_trans_agblocks_delta(tp, nfree);
404 /*
405 * There are new blocks in the old last a.g.
406 */
407 if (new) {
408 /*
409 * Change the agi length.
410 */
411 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
412 if (error) {
413 goto error0;
414 }
415 ASSERT(bp);
416 agi = XFS_BUF_TO_AGI(bp);
417 be32_add_cpu(&agi->agi_length, new);
418 ASSERT(nagcount == oagcount ||
419 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
420 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
421 /*
422 * Change agf length.
423 */
424 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
425 if (error) {
426 goto error0;
427 }
428 ASSERT(bp);
429 agf = XFS_BUF_TO_AGF(bp);
430 be32_add_cpu(&agf->agf_length, new);
431 ASSERT(be32_to_cpu(agf->agf_length) ==
432 be32_to_cpu(agi->agi_length));
433
434 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
435 /*
436 * Free the new space.
437 */
438 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
439 be32_to_cpu(agf->agf_length) - new), new);
440 if (error) {
441 goto error0;
442 }
443 }
444
445 /*
446 * Update changed superblock fields transactionally. These are not
447 * seen by the rest of the world until the transaction commit applies
448 * them atomically to the superblock.
449 */
450 if (nagcount > oagcount)
451 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
452 if (nb > mp->m_sb.sb_dblocks)
453 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
454 nb - mp->m_sb.sb_dblocks);
455 if (nfree)
456 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
457 if (dpct)
458 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
459 error = xfs_trans_commit(tp, 0);
460 if (error)
461 return error;
462
463 /* New allocation groups fully initialized, so update mount struct */
464 if (nagimax)
465 mp->m_maxagi = nagimax;
466 if (mp->m_sb.sb_imax_pct) {
467 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
468 do_div(icount, 100);
469 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
470 } else
471 mp->m_maxicount = 0;
472 xfs_set_low_space_thresholds(mp);
473
474 /* update secondary superblocks. */
475 for (agno = 1; agno < nagcount; agno++) {
476 error = 0;
477 /*
478 * new secondary superblocks need to be zeroed, not read from
479 * disk as the contents of the new area we are growing into is
480 * completely unknown.
481 */
482 if (agno < oagcount) {
483 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
484 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
485 XFS_FSS_TO_BB(mp, 1), 0, &bp,
486 &xfs_sb_buf_ops);
487 } else {
488 bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
489 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
490 XFS_FSS_TO_BB(mp, 1), 0);
491 if (bp) {
492 bp->b_ops = &xfs_sb_buf_ops;
493 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
494 } else
495 error = ENOMEM;
496 }
497
498 if (error) {
499 xfs_warn(mp,
500 "error %d reading secondary superblock for ag %d",
501 error, agno);
502 break;
503 }
504 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
505
506 /*
507 * If we get an error writing out the alternate superblocks,
508 * just issue a warning and continue. The real work is
509 * already done and committed.
510 */
511 error = xfs_bwrite(bp);
512 xfs_buf_relse(bp);
513 if (error) {
514 xfs_warn(mp,
515 "write error %d updating secondary superblock for ag %d",
516 error, agno);
517 break; /* no point in continuing */
518 }
519 }
520 return error;
521
522 error0:
523 xfs_trans_cancel(tp, XFS_TRANS_ABORT);
524 return error;
525 }
526
527 static int
528 xfs_growfs_log_private(
529 xfs_mount_t *mp, /* mount point for filesystem */
530 xfs_growfs_log_t *in) /* growfs log input struct */
531 {
532 xfs_extlen_t nb;
533
534 nb = in->newblocks;
535 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
536 return XFS_ERROR(EINVAL);
537 if (nb == mp->m_sb.sb_logblocks &&
538 in->isint == (mp->m_sb.sb_logstart != 0))
539 return XFS_ERROR(EINVAL);
540 /*
541 * Moving the log is hard, need new interfaces to sync
542 * the log first, hold off all activity while moving it.
543 * Can have shorter or longer log in the same space,
544 * or transform internal to external log or vice versa.
545 */
546 return XFS_ERROR(ENOSYS);
547 }
548
549 /*
550 * protected versions of growfs function acquire and release locks on the mount
551 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
552 * XFS_IOC_FSGROWFSRT
553 */
554
555
556 int
557 xfs_growfs_data(
558 xfs_mount_t *mp,
559 xfs_growfs_data_t *in)
560 {
561 int error;
562
563 if (!capable(CAP_SYS_ADMIN))
564 return XFS_ERROR(EPERM);
565 if (!mutex_trylock(&mp->m_growlock))
566 return XFS_ERROR(EWOULDBLOCK);
567 error = xfs_growfs_data_private(mp, in);
568 mutex_unlock(&mp->m_growlock);
569 return error;
570 }
571
572 int
573 xfs_growfs_log(
574 xfs_mount_t *mp,
575 xfs_growfs_log_t *in)
576 {
577 int error;
578
579 if (!capable(CAP_SYS_ADMIN))
580 return XFS_ERROR(EPERM);
581 if (!mutex_trylock(&mp->m_growlock))
582 return XFS_ERROR(EWOULDBLOCK);
583 error = xfs_growfs_log_private(mp, in);
584 mutex_unlock(&mp->m_growlock);
585 return error;
586 }
587
588 /*
589 * exported through ioctl XFS_IOC_FSCOUNTS
590 */
591
592 int
593 xfs_fs_counts(
594 xfs_mount_t *mp,
595 xfs_fsop_counts_t *cnt)
596 {
597 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
598 spin_lock(&mp->m_sb_lock);
599 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
600 cnt->freertx = mp->m_sb.sb_frextents;
601 cnt->freeino = mp->m_sb.sb_ifree;
602 cnt->allocino = mp->m_sb.sb_icount;
603 spin_unlock(&mp->m_sb_lock);
604 return 0;
605 }
606
607 /*
608 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
609 *
610 * xfs_reserve_blocks is called to set m_resblks
611 * in the in-core mount table. The number of unused reserved blocks
612 * is kept in m_resblks_avail.
613 *
614 * Reserve the requested number of blocks if available. Otherwise return
615 * as many as possible to satisfy the request. The actual number
616 * reserved are returned in outval
617 *
618 * A null inval pointer indicates that only the current reserved blocks
619 * available should be returned no settings are changed.
620 */
621
622 int
623 xfs_reserve_blocks(
624 xfs_mount_t *mp,
625 __uint64_t *inval,
626 xfs_fsop_resblks_t *outval)
627 {
628 __int64_t lcounter, delta, fdblks_delta;
629 __uint64_t request;
630
631 /* If inval is null, report current values and return */
632 if (inval == (__uint64_t *)NULL) {
633 if (!outval)
634 return EINVAL;
635 outval->resblks = mp->m_resblks;
636 outval->resblks_avail = mp->m_resblks_avail;
637 return 0;
638 }
639
640 request = *inval;
641
642 /*
643 * With per-cpu counters, this becomes an interesting
644 * problem. we needto work out if we are freeing or allocation
645 * blocks first, then we can do the modification as necessary.
646 *
647 * We do this under the m_sb_lock so that if we are near
648 * ENOSPC, we will hold out any changes while we work out
649 * what to do. This means that the amount of free space can
650 * change while we do this, so we need to retry if we end up
651 * trying to reserve more space than is available.
652 *
653 * We also use the xfs_mod_incore_sb() interface so that we
654 * don't have to care about whether per cpu counter are
655 * enabled, disabled or even compiled in....
656 */
657 retry:
658 spin_lock(&mp->m_sb_lock);
659 xfs_icsb_sync_counters_locked(mp, 0);
660
661 /*
662 * If our previous reservation was larger than the current value,
663 * then move any unused blocks back to the free pool.
664 */
665 fdblks_delta = 0;
666 if (mp->m_resblks > request) {
667 lcounter = mp->m_resblks_avail - request;
668 if (lcounter > 0) { /* release unused blocks */
669 fdblks_delta = lcounter;
670 mp->m_resblks_avail -= lcounter;
671 }
672 mp->m_resblks = request;
673 } else {
674 __int64_t free;
675
676 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
677 if (!free)
678 goto out; /* ENOSPC and fdblks_delta = 0 */
679
680 delta = request - mp->m_resblks;
681 lcounter = free - delta;
682 if (lcounter < 0) {
683 /* We can't satisfy the request, just get what we can */
684 mp->m_resblks += free;
685 mp->m_resblks_avail += free;
686 fdblks_delta = -free;
687 } else {
688 fdblks_delta = -delta;
689 mp->m_resblks = request;
690 mp->m_resblks_avail += delta;
691 }
692 }
693 out:
694 if (outval) {
695 outval->resblks = mp->m_resblks;
696 outval->resblks_avail = mp->m_resblks_avail;
697 }
698 spin_unlock(&mp->m_sb_lock);
699
700 if (fdblks_delta) {
701 /*
702 * If we are putting blocks back here, m_resblks_avail is
703 * already at its max so this will put it in the free pool.
704 *
705 * If we need space, we'll either succeed in getting it
706 * from the free block count or we'll get an enospc. If
707 * we get a ENOSPC, it means things changed while we were
708 * calculating fdblks_delta and so we should try again to
709 * see if there is anything left to reserve.
710 *
711 * Don't set the reserved flag here - we don't want to reserve
712 * the extra reserve blocks from the reserve.....
713 */
714 int error;
715 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
716 fdblks_delta, 0);
717 if (error == ENOSPC)
718 goto retry;
719 }
720 return 0;
721 }
722
723 /*
724 * Dump a transaction into the log that contains no real change. This is needed
725 * to be able to make the log dirty or stamp the current tail LSN into the log
726 * during the covering operation.
727 *
728 * We cannot use an inode here for this - that will push dirty state back up
729 * into the VFS and then periodic inode flushing will prevent log covering from
730 * making progress. Hence we log a field in the superblock instead and use a
731 * synchronous transaction to ensure the superblock is immediately unpinned
732 * and can be written back.
733 */
734 int
735 xfs_fs_log_dummy(
736 xfs_mount_t *mp)
737 {
738 xfs_trans_t *tp;
739 int error;
740
741 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
742 error = xfs_trans_reserve(tp, 0, XFS_SB_LOG_RES(mp), 0, 0,
743 XFS_DEFAULT_LOG_COUNT);
744 if (error) {
745 xfs_trans_cancel(tp, 0);
746 return error;
747 }
748
749 /* log the UUID because it is an unchanging field */
750 xfs_mod_sb(tp, XFS_SB_UUID);
751 xfs_trans_set_sync(tp);
752 return xfs_trans_commit(tp, 0);
753 }
754
755 int
756 xfs_fs_goingdown(
757 xfs_mount_t *mp,
758 __uint32_t inflags)
759 {
760 switch (inflags) {
761 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
762 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
763
764 if (sb && !IS_ERR(sb)) {
765 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
766 thaw_bdev(sb->s_bdev, sb);
767 }
768
769 break;
770 }
771 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
772 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
773 break;
774 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
775 xfs_force_shutdown(mp,
776 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
777 break;
778 default:
779 return XFS_ERROR(EINVAL);
780 }
781
782 return 0;
783 }
784
785 /*
786 * Force a shutdown of the filesystem instantly while keeping the filesystem
787 * consistent. We don't do an unmount here; just shutdown the shop, make sure
788 * that absolutely nothing persistent happens to this filesystem after this
789 * point.
790 */
791 void
792 xfs_do_force_shutdown(
793 xfs_mount_t *mp,
794 int flags,
795 char *fname,
796 int lnnum)
797 {
798 int logerror;
799
800 logerror = flags & SHUTDOWN_LOG_IO_ERROR;
801
802 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
803 xfs_notice(mp,
804 "%s(0x%x) called from line %d of file %s. Return address = 0x%p",
805 __func__, flags, lnnum, fname, __return_address);
806 }
807 /*
808 * No need to duplicate efforts.
809 */
810 if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
811 return;
812
813 /*
814 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
815 * queue up anybody new on the log reservations, and wakes up
816 * everybody who's sleeping on log reservations to tell them
817 * the bad news.
818 */
819 if (xfs_log_force_umount(mp, logerror))
820 return;
821
822 if (flags & SHUTDOWN_CORRUPT_INCORE) {
823 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
824 "Corruption of in-memory data detected. Shutting down filesystem");
825 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
826 xfs_stack_trace();
827 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
828 if (logerror) {
829 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
830 "Log I/O Error Detected. Shutting down filesystem");
831 } else if (flags & SHUTDOWN_DEVICE_REQ) {
832 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
833 "All device paths lost. Shutting down filesystem");
834 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
835 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
836 "I/O Error Detected. Shutting down filesystem");
837 }
838 }
839 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
840 xfs_alert(mp,
841 "Please umount the filesystem and rectify the problem(s)");
842 }
843 }
Linus' kernel tree