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Merge tag 'mac80211-for-davem-2015-12-15' of git://git.kernel.org/pub/scm/linux/kerne...
[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_mount.h"
26 #include "xfs_da_format.h"
27 #include "xfs_da_btree.h"
28 #include "xfs_inode.h"
29 #include "xfs_trans.h"
30 #include "xfs_inode_item.h"
31 #include "xfs_error.h"
32 #include "xfs_btree.h"
33 #include "xfs_alloc_btree.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_trace.h"
41 #include "xfs_log.h"
42 #include "xfs_filestream.h"
43
44 /*
45 * File system operations
46 */
47
48 int
49 xfs_fs_geometry(
50 xfs_mount_t *mp,
51 xfs_fsop_geom_t *geo,
52 int new_version)
53 {
54
55 memset(geo, 0, sizeof(*geo));
56
57 geo->blocksize = mp->m_sb.sb_blocksize;
58 geo->rtextsize = mp->m_sb.sb_rextsize;
59 geo->agblocks = mp->m_sb.sb_agblocks;
60 geo->agcount = mp->m_sb.sb_agcount;
61 geo->logblocks = mp->m_sb.sb_logblocks;
62 geo->sectsize = mp->m_sb.sb_sectsize;
63 geo->inodesize = mp->m_sb.sb_inodesize;
64 geo->imaxpct = mp->m_sb.sb_imax_pct;
65 geo->datablocks = mp->m_sb.sb_dblocks;
66 geo->rtblocks = mp->m_sb.sb_rblocks;
67 geo->rtextents = mp->m_sb.sb_rextents;
68 geo->logstart = mp->m_sb.sb_logstart;
69 ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
70 memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
71 if (new_version >= 2) {
72 geo->sunit = mp->m_sb.sb_unit;
73 geo->swidth = mp->m_sb.sb_width;
74 }
75 if (new_version >= 3) {
76 geo->version = XFS_FSOP_GEOM_VERSION;
77 geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK |
78 XFS_FSOP_GEOM_FLAGS_DIRV2 |
79 (xfs_sb_version_hasattr(&mp->m_sb) ?
80 XFS_FSOP_GEOM_FLAGS_ATTR : 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_hasextflgbit(&mp->m_sb) ?
88 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
89 (xfs_sb_version_hassector(&mp->m_sb) ?
90 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
91 (xfs_sb_version_hasasciici(&mp->m_sb) ?
92 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
93 (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
94 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
95 (xfs_sb_version_hasattr2(&mp->m_sb) ?
96 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) |
97 (xfs_sb_version_hasprojid32bit(&mp->m_sb) ?
98 XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) |
99 (xfs_sb_version_hascrc(&mp->m_sb) ?
100 XFS_FSOP_GEOM_FLAGS_V5SB : 0) |
101 (xfs_sb_version_hasftype(&mp->m_sb) ?
102 XFS_FSOP_GEOM_FLAGS_FTYPE : 0) |
103 (xfs_sb_version_hasfinobt(&mp->m_sb) ?
104 XFS_FSOP_GEOM_FLAGS_FINOBT : 0) |
105 (xfs_sb_version_hassparseinodes(&mp->m_sb) ?
106 XFS_FSOP_GEOM_FLAGS_SPINODES : 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);
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_meta_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_meta_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_meta_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 xfs_trans_set_sync(tp);
494 error = xfs_trans_commit(tp);
495 if (error)
496 return error;
497
498 /* New allocation groups fully initialized, so update mount struct */
499 if (nagimax)
500 mp->m_maxagi = nagimax;
501 if (mp->m_sb.sb_imax_pct) {
502 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
503 do_div(icount, 100);
504 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
505 } else
506 mp->m_maxicount = 0;
507 xfs_set_low_space_thresholds(mp);
508
509 /* update secondary superblocks. */
510 for (agno = 1; agno < nagcount; agno++) {
511 error = 0;
512 /*
513 * new secondary superblocks need to be zeroed, not read from
514 * disk as the contents of the new area we are growing into is
515 * completely unknown.
516 */
517 if (agno < oagcount) {
518 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
519 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
520 XFS_FSS_TO_BB(mp, 1), 0, &bp,
521 &xfs_sb_buf_ops);
522 } else {
523 bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
524 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
525 XFS_FSS_TO_BB(mp, 1), 0);
526 if (bp) {
527 bp->b_ops = &xfs_sb_buf_ops;
528 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
529 } else
530 error = -ENOMEM;
531 }
532
533 /*
534 * If we get an error reading or writing alternate superblocks,
535 * continue. xfs_repair chooses the "best" superblock based
536 * on most matches; if we break early, we'll leave more
537 * superblocks un-updated than updated, and xfs_repair may
538 * pick them over the properly-updated primary.
539 */
540 if (error) {
541 xfs_warn(mp,
542 "error %d reading secondary superblock for ag %d",
543 error, agno);
544 saved_error = error;
545 continue;
546 }
547 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
548
549 error = xfs_bwrite(bp);
550 xfs_buf_relse(bp);
551 if (error) {
552 xfs_warn(mp,
553 "write error %d updating secondary superblock for ag %d",
554 error, agno);
555 saved_error = error;
556 continue;
557 }
558 }
559 return saved_error ? saved_error : error;
560
561 error0:
562 xfs_trans_cancel(tp);
563 return error;
564 }
565
566 static int
567 xfs_growfs_log_private(
568 xfs_mount_t *mp, /* mount point for filesystem */
569 xfs_growfs_log_t *in) /* growfs log input struct */
570 {
571 xfs_extlen_t nb;
572
573 nb = in->newblocks;
574 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
575 return -EINVAL;
576 if (nb == mp->m_sb.sb_logblocks &&
577 in->isint == (mp->m_sb.sb_logstart != 0))
578 return -EINVAL;
579 /*
580 * Moving the log is hard, need new interfaces to sync
581 * the log first, hold off all activity while moving it.
582 * Can have shorter or longer log in the same space,
583 * or transform internal to external log or vice versa.
584 */
585 return -ENOSYS;
586 }
587
588 /*
589 * protected versions of growfs function acquire and release locks on the mount
590 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
591 * XFS_IOC_FSGROWFSRT
592 */
593
594
595 int
596 xfs_growfs_data(
597 xfs_mount_t *mp,
598 xfs_growfs_data_t *in)
599 {
600 int error;
601
602 if (!capable(CAP_SYS_ADMIN))
603 return -EPERM;
604 if (!mutex_trylock(&mp->m_growlock))
605 return -EWOULDBLOCK;
606 error = xfs_growfs_data_private(mp, in);
607 /*
608 * Increment the generation unconditionally, the error could be from
609 * updating the secondary superblocks, in which case the new size
610 * is live already.
611 */
612 mp->m_generation++;
613 mutex_unlock(&mp->m_growlock);
614 return error;
615 }
616
617 int
618 xfs_growfs_log(
619 xfs_mount_t *mp,
620 xfs_growfs_log_t *in)
621 {
622 int error;
623
624 if (!capable(CAP_SYS_ADMIN))
625 return -EPERM;
626 if (!mutex_trylock(&mp->m_growlock))
627 return -EWOULDBLOCK;
628 error = xfs_growfs_log_private(mp, in);
629 mutex_unlock(&mp->m_growlock);
630 return error;
631 }
632
633 /*
634 * exported through ioctl XFS_IOC_FSCOUNTS
635 */
636
637 int
638 xfs_fs_counts(
639 xfs_mount_t *mp,
640 xfs_fsop_counts_t *cnt)
641 {
642 cnt->allocino = percpu_counter_read_positive(&mp->m_icount);
643 cnt->freeino = percpu_counter_read_positive(&mp->m_ifree);
644 cnt->freedata = percpu_counter_read_positive(&mp->m_fdblocks) -
645 XFS_ALLOC_SET_ASIDE(mp);
646
647 spin_lock(&mp->m_sb_lock);
648 cnt->freertx = mp->m_sb.sb_frextents;
649 spin_unlock(&mp->m_sb_lock);
650 return 0;
651 }
652
653 /*
654 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
655 *
656 * xfs_reserve_blocks is called to set m_resblks
657 * in the in-core mount table. The number of unused reserved blocks
658 * is kept in m_resblks_avail.
659 *
660 * Reserve the requested number of blocks if available. Otherwise return
661 * as many as possible to satisfy the request. The actual number
662 * reserved are returned in outval
663 *
664 * A null inval pointer indicates that only the current reserved blocks
665 * available should be returned no settings are changed.
666 */
667
668 int
669 xfs_reserve_blocks(
670 xfs_mount_t *mp,
671 __uint64_t *inval,
672 xfs_fsop_resblks_t *outval)
673 {
674 __int64_t lcounter, delta, fdblks_delta;
675 __uint64_t request;
676
677 /* If inval is null, report current values and return */
678 if (inval == (__uint64_t *)NULL) {
679 if (!outval)
680 return -EINVAL;
681 outval->resblks = mp->m_resblks;
682 outval->resblks_avail = mp->m_resblks_avail;
683 return 0;
684 }
685
686 request = *inval;
687
688 /*
689 * With per-cpu counters, this becomes an interesting
690 * problem. we needto work out if we are freeing or allocation
691 * blocks first, then we can do the modification as necessary.
692 *
693 * We do this under the m_sb_lock so that if we are near
694 * ENOSPC, we will hold out any changes while we work out
695 * what to do. This means that the amount of free space can
696 * change while we do this, so we need to retry if we end up
697 * trying to reserve more space than is available.
698 */
699 retry:
700 spin_lock(&mp->m_sb_lock);
701
702 /*
703 * If our previous reservation was larger than the current value,
704 * then move any unused blocks back to the free pool.
705 */
706 fdblks_delta = 0;
707 if (mp->m_resblks > request) {
708 lcounter = mp->m_resblks_avail - request;
709 if (lcounter > 0) { /* release unused blocks */
710 fdblks_delta = lcounter;
711 mp->m_resblks_avail -= lcounter;
712 }
713 mp->m_resblks = request;
714 } else {
715 __int64_t free;
716
717 free = percpu_counter_sum(&mp->m_fdblocks) -
718 XFS_ALLOC_SET_ASIDE(mp);
719 if (!free)
720 goto out; /* ENOSPC and fdblks_delta = 0 */
721
722 delta = request - mp->m_resblks;
723 lcounter = free - delta;
724 if (lcounter < 0) {
725 /* We can't satisfy the request, just get what we can */
726 mp->m_resblks += free;
727 mp->m_resblks_avail += free;
728 fdblks_delta = -free;
729 } else {
730 fdblks_delta = -delta;
731 mp->m_resblks = request;
732 mp->m_resblks_avail += delta;
733 }
734 }
735 out:
736 if (outval) {
737 outval->resblks = mp->m_resblks;
738 outval->resblks_avail = mp->m_resblks_avail;
739 }
740 spin_unlock(&mp->m_sb_lock);
741
742 if (fdblks_delta) {
743 /*
744 * If we are putting blocks back here, m_resblks_avail is
745 * already at its max so this will put it in the free pool.
746 *
747 * If we need space, we'll either succeed in getting it
748 * from the free block count or we'll get an enospc. If
749 * we get a ENOSPC, it means things changed while we were
750 * calculating fdblks_delta and so we should try again to
751 * see if there is anything left to reserve.
752 *
753 * Don't set the reserved flag here - we don't want to reserve
754 * the extra reserve blocks from the reserve.....
755 */
756 int error;
757 error = xfs_mod_fdblocks(mp, fdblks_delta, 0);
758 if (error == -ENOSPC)
759 goto retry;
760 }
761 return 0;
762 }
763
764 int
765 xfs_fs_goingdown(
766 xfs_mount_t *mp,
767 __uint32_t inflags)
768 {
769 switch (inflags) {
770 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
771 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
772
773 if (sb && !IS_ERR(sb)) {
774 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
775 thaw_bdev(sb->s_bdev, sb);
776 }
777
778 break;
779 }
780 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
781 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
782 break;
783 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
784 xfs_force_shutdown(mp,
785 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
786 break;
787 default:
788 return -EINVAL;
789 }
790
791 return 0;
792 }
793
794 /*
795 * Force a shutdown of the filesystem instantly while keeping the filesystem
796 * consistent. We don't do an unmount here; just shutdown the shop, make sure
797 * that absolutely nothing persistent happens to this filesystem after this
798 * point.
799 */
800 void
801 xfs_do_force_shutdown(
802 xfs_mount_t *mp,
803 int flags,
804 char *fname,
805 int lnnum)
806 {
807 int logerror;
808
809 logerror = flags & SHUTDOWN_LOG_IO_ERROR;
810
811 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
812 xfs_notice(mp,
813 "%s(0x%x) called from line %d of file %s. Return address = 0x%p",
814 __func__, flags, lnnum, fname, __return_address);
815 }
816 /*
817 * No need to duplicate efforts.
818 */
819 if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
820 return;
821
822 /*
823 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
824 * queue up anybody new on the log reservations, and wakes up
825 * everybody who's sleeping on log reservations to tell them
826 * the bad news.
827 */
828 if (xfs_log_force_umount(mp, logerror))
829 return;
830
831 if (flags & SHUTDOWN_CORRUPT_INCORE) {
832 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
833 "Corruption of in-memory data detected. Shutting down filesystem");
834 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
835 xfs_stack_trace();
836 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
837 if (logerror) {
838 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
839 "Log I/O Error Detected. Shutting down filesystem");
840 } else if (flags & SHUTDOWN_DEVICE_REQ) {
841 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
842 "All device paths lost. Shutting down filesystem");
843 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
844 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
845 "I/O Error Detected. Shutting down filesystem");
846 }
847 }
848 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
849 xfs_alert(mp,
850 "Please umount the filesystem and rectify the problem(s)");
851 }
852 }
Linux kernel - Deliverables
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