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[mirror_ubuntu-artful-kernel.git] / fs / xfs / xfs_fsops.c
1 /*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_types.h"
21 #include "xfs_log.h"
22 #include "xfs_trans.h"
23 #include "xfs_sb.h"
24 #include "xfs_ag.h"
25 #include "xfs_mount.h"
26 #include "xfs_bmap_btree.h"
27 #include "xfs_alloc_btree.h"
28 #include "xfs_ialloc_btree.h"
29 #include "xfs_dinode.h"
30 #include "xfs_inode.h"
31 #include "xfs_inode_item.h"
32 #include "xfs_btree.h"
33 #include "xfs_error.h"
34 #include "xfs_alloc.h"
35 #include "xfs_ialloc.h"
36 #include "xfs_fsops.h"
37 #include "xfs_itable.h"
38 #include "xfs_trans_space.h"
39 #include "xfs_rtalloc.h"
40 #include "xfs_filestream.h"
41 #include "xfs_trace.h"
42
43 /*
44 * File system operations
45 */
46
47 int
48 xfs_fs_geometry(
49 xfs_mount_t *mp,
50 xfs_fsop_geom_t *geo,
51 int new_version)
52 {
53
54 memset(geo, 0, sizeof(*geo));
55
56 geo->blocksize = mp->m_sb.sb_blocksize;
57 geo->rtextsize = mp->m_sb.sb_rextsize;
58 geo->agblocks = mp->m_sb.sb_agblocks;
59 geo->agcount = mp->m_sb.sb_agcount;
60 geo->logblocks = mp->m_sb.sb_logblocks;
61 geo->sectsize = mp->m_sb.sb_sectsize;
62 geo->inodesize = mp->m_sb.sb_inodesize;
63 geo->imaxpct = mp->m_sb.sb_imax_pct;
64 geo->datablocks = mp->m_sb.sb_dblocks;
65 geo->rtblocks = mp->m_sb.sb_rblocks;
66 geo->rtextents = mp->m_sb.sb_rextents;
67 geo->logstart = mp->m_sb.sb_logstart;
68 ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
69 memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
70 if (new_version >= 2) {
71 geo->sunit = mp->m_sb.sb_unit;
72 geo->swidth = mp->m_sb.sb_width;
73 }
74 if (new_version >= 3) {
75 geo->version = XFS_FSOP_GEOM_VERSION;
76 geo->flags =
77 (xfs_sb_version_hasattr(&mp->m_sb) ?
78 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
79 (xfs_sb_version_hasnlink(&mp->m_sb) ?
80 XFS_FSOP_GEOM_FLAGS_NLINK : 0) |
81 (xfs_sb_version_hasquota(&mp->m_sb) ?
82 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
83 (xfs_sb_version_hasalign(&mp->m_sb) ?
84 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
85 (xfs_sb_version_hasdalign(&mp->m_sb) ?
86 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
87 (xfs_sb_version_hasshared(&mp->m_sb) ?
88 XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
89 (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
90 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
91 (xfs_sb_version_hasdirv2(&mp->m_sb) ?
92 XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) |
93 (xfs_sb_version_hassector(&mp->m_sb) ?
94 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
95 (xfs_sb_version_hasasciici(&mp->m_sb) ?
96 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
97 (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
98 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
99 (xfs_sb_version_hasattr2(&mp->m_sb) ?
100 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) |
101 (xfs_sb_version_hasprojid32bit(&mp->m_sb) ?
102 XFS_FSOP_GEOM_FLAGS_PROJID32 : 0);
103 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
104 mp->m_sb.sb_logsectsize : BBSIZE;
105 geo->rtsectsize = mp->m_sb.sb_blocksize;
106 geo->dirblocksize = mp->m_dirblksize;
107 }
108 if (new_version >= 4) {
109 geo->flags |=
110 (xfs_sb_version_haslogv2(&mp->m_sb) ?
111 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
112 geo->logsunit = mp->m_sb.sb_logsunit;
113 }
114 return 0;
115 }
116
117 static struct xfs_buf *
118 xfs_growfs_get_hdr_buf(
119 struct xfs_mount *mp,
120 xfs_daddr_t blkno,
121 size_t numblks,
122 int flags,
123 const struct xfs_buf_ops *ops)
124 {
125 struct xfs_buf *bp;
126
127 bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
128 if (!bp)
129 return NULL;
130
131 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
132 bp->b_bn = blkno;
133 bp->b_maps[0].bm_bn = blkno;
134 bp->b_ops = ops;
135
136 return bp;
137 }
138
139 static int
140 xfs_growfs_data_private(
141 xfs_mount_t *mp, /* mount point for filesystem */
142 xfs_growfs_data_t *in) /* growfs data input struct */
143 {
144 xfs_agf_t *agf;
145 struct xfs_agfl *agfl;
146 xfs_agi_t *agi;
147 xfs_agnumber_t agno;
148 xfs_extlen_t agsize;
149 xfs_extlen_t tmpsize;
150 xfs_alloc_rec_t *arec;
151 xfs_buf_t *bp;
152 int bucket;
153 int dpct;
154 int error;
155 xfs_agnumber_t nagcount;
156 xfs_agnumber_t nagimax = 0;
157 xfs_rfsblock_t nb, nb_mod;
158 xfs_rfsblock_t new;
159 xfs_rfsblock_t nfree;
160 xfs_agnumber_t oagcount;
161 int pct;
162 xfs_trans_t *tp;
163
164 nb = in->newblocks;
165 pct = in->imaxpct;
166 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
167 return XFS_ERROR(EINVAL);
168 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
169 return error;
170 dpct = pct - mp->m_sb.sb_imax_pct;
171 bp = xfs_buf_read_uncached(mp->m_ddev_targp,
172 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
173 XFS_FSS_TO_BB(mp, 1), 0, NULL);
174 if (!bp)
175 return EIO;
176 if (bp->b_error) {
177 int error = bp->b_error;
178 xfs_buf_relse(bp);
179 return error;
180 }
181 xfs_buf_relse(bp);
182
183 new = nb; /* use new as a temporary here */
184 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
185 nagcount = new + (nb_mod != 0);
186 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
187 nagcount--;
188 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
189 if (nb < mp->m_sb.sb_dblocks)
190 return XFS_ERROR(EINVAL);
191 }
192 new = nb - mp->m_sb.sb_dblocks;
193 oagcount = mp->m_sb.sb_agcount;
194
195 /* allocate the new per-ag structures */
196 if (nagcount > oagcount) {
197 error = xfs_initialize_perag(mp, nagcount, &nagimax);
198 if (error)
199 return error;
200 }
201
202 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
203 tp->t_flags |= XFS_TRANS_RESERVE;
204 if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
205 XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
206 xfs_trans_cancel(tp, 0);
207 return error;
208 }
209
210 /*
211 * Write new AG headers to disk. Non-transactional, but written
212 * synchronously so they are completed prior to the growfs transaction
213 * being logged.
214 */
215 nfree = 0;
216 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
217 /*
218 * AG freespace header block
219 */
220 bp = xfs_growfs_get_hdr_buf(mp,
221 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
222 XFS_FSS_TO_BB(mp, 1), 0,
223 &xfs_agf_buf_ops);
224 if (!bp) {
225 error = ENOMEM;
226 goto error0;
227 }
228
229 agf = XFS_BUF_TO_AGF(bp);
230 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
231 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
232 agf->agf_seqno = cpu_to_be32(agno);
233 if (agno == nagcount - 1)
234 agsize =
235 nb -
236 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
237 else
238 agsize = mp->m_sb.sb_agblocks;
239 agf->agf_length = cpu_to_be32(agsize);
240 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
241 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
242 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
243 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
244 agf->agf_flfirst = 0;
245 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
246 agf->agf_flcount = 0;
247 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
248 agf->agf_freeblks = cpu_to_be32(tmpsize);
249 agf->agf_longest = cpu_to_be32(tmpsize);
250 if (xfs_sb_version_hascrc(&mp->m_sb))
251 uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_uuid);
252
253 error = xfs_bwrite(bp);
254 xfs_buf_relse(bp);
255 if (error)
256 goto error0;
257
258 /*
259 * AG freelist header block
260 */
261 bp = xfs_growfs_get_hdr_buf(mp,
262 XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)),
263 XFS_FSS_TO_BB(mp, 1), 0,
264 &xfs_agfl_buf_ops);
265 if (!bp) {
266 error = ENOMEM;
267 goto error0;
268 }
269
270 agfl = XFS_BUF_TO_AGFL(bp);
271 if (xfs_sb_version_hascrc(&mp->m_sb)) {
272 agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
273 agfl->agfl_seqno = cpu_to_be32(agno);
274 uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_uuid);
275 }
276 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
277 agfl->agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
278
279 error = xfs_bwrite(bp);
280 xfs_buf_relse(bp);
281 if (error)
282 goto error0;
283
284 /*
285 * AG inode header block
286 */
287 bp = xfs_growfs_get_hdr_buf(mp,
288 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
289 XFS_FSS_TO_BB(mp, 1), 0,
290 &xfs_agi_buf_ops);
291 if (!bp) {
292 error = ENOMEM;
293 goto error0;
294 }
295
296 agi = XFS_BUF_TO_AGI(bp);
297 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
298 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
299 agi->agi_seqno = cpu_to_be32(agno);
300 agi->agi_length = cpu_to_be32(agsize);
301 agi->agi_count = 0;
302 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
303 agi->agi_level = cpu_to_be32(1);
304 agi->agi_freecount = 0;
305 agi->agi_newino = cpu_to_be32(NULLAGINO);
306 agi->agi_dirino = cpu_to_be32(NULLAGINO);
307 if (xfs_sb_version_hascrc(&mp->m_sb))
308 uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_uuid);
309 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
310 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
311
312 error = xfs_bwrite(bp);
313 xfs_buf_relse(bp);
314 if (error)
315 goto error0;
316
317 /*
318 * BNO btree root block
319 */
320 bp = xfs_growfs_get_hdr_buf(mp,
321 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
322 BTOBB(mp->m_sb.sb_blocksize), 0,
323 &xfs_allocbt_buf_ops);
324
325 if (!bp) {
326 error = ENOMEM;
327 goto error0;
328 }
329
330 if (xfs_sb_version_hascrc(&mp->m_sb))
331 xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1,
332 agno, XFS_BTREE_CRC_BLOCKS);
333 else
334 xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1,
335 agno, 0);
336
337 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
338 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
339 arec->ar_blockcount = cpu_to_be32(
340 agsize - be32_to_cpu(arec->ar_startblock));
341
342 error = xfs_bwrite(bp);
343 xfs_buf_relse(bp);
344 if (error)
345 goto error0;
346
347 /*
348 * CNT btree root block
349 */
350 bp = xfs_growfs_get_hdr_buf(mp,
351 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
352 BTOBB(mp->m_sb.sb_blocksize), 0,
353 &xfs_allocbt_buf_ops);
354 if (!bp) {
355 error = ENOMEM;
356 goto error0;
357 }
358
359 if (xfs_sb_version_hascrc(&mp->m_sb))
360 xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1,
361 agno, XFS_BTREE_CRC_BLOCKS);
362 else
363 xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1,
364 agno, 0);
365
366 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
367 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
368 arec->ar_blockcount = cpu_to_be32(
369 agsize - be32_to_cpu(arec->ar_startblock));
370 nfree += be32_to_cpu(arec->ar_blockcount);
371
372 error = xfs_bwrite(bp);
373 xfs_buf_relse(bp);
374 if (error)
375 goto error0;
376
377 /*
378 * INO btree root block
379 */
380 bp = xfs_growfs_get_hdr_buf(mp,
381 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
382 BTOBB(mp->m_sb.sb_blocksize), 0,
383 &xfs_inobt_buf_ops);
384 if (!bp) {
385 error = ENOMEM;
386 goto error0;
387 }
388
389 if (xfs_sb_version_hascrc(&mp->m_sb))
390 xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0,
391 agno, XFS_BTREE_CRC_BLOCKS);
392 else
393 xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0,
394 agno, 0);
395
396 error = xfs_bwrite(bp);
397 xfs_buf_relse(bp);
398 if (error)
399 goto error0;
400 }
401 xfs_trans_agblocks_delta(tp, nfree);
402 /*
403 * There are new blocks in the old last a.g.
404 */
405 if (new) {
406 /*
407 * Change the agi length.
408 */
409 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
410 if (error) {
411 goto error0;
412 }
413 ASSERT(bp);
414 agi = XFS_BUF_TO_AGI(bp);
415 be32_add_cpu(&agi->agi_length, new);
416 ASSERT(nagcount == oagcount ||
417 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
418 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
419 /*
420 * Change agf length.
421 */
422 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
423 if (error) {
424 goto error0;
425 }
426 ASSERT(bp);
427 agf = XFS_BUF_TO_AGF(bp);
428 be32_add_cpu(&agf->agf_length, new);
429 ASSERT(be32_to_cpu(agf->agf_length) ==
430 be32_to_cpu(agi->agi_length));
431
432 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
433 /*
434 * Free the new space.
435 */
436 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
437 be32_to_cpu(agf->agf_length) - new), new);
438 if (error) {
439 goto error0;
440 }
441 }
442
443 /*
444 * Update changed superblock fields transactionally. These are not
445 * seen by the rest of the world until the transaction commit applies
446 * them atomically to the superblock.
447 */
448 if (nagcount > oagcount)
449 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
450 if (nb > mp->m_sb.sb_dblocks)
451 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
452 nb - mp->m_sb.sb_dblocks);
453 if (nfree)
454 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
455 if (dpct)
456 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
457 error = xfs_trans_commit(tp, 0);
458 if (error)
459 return error;
460
461 /* New allocation groups fully initialized, so update mount struct */
462 if (nagimax)
463 mp->m_maxagi = nagimax;
464 if (mp->m_sb.sb_imax_pct) {
465 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
466 do_div(icount, 100);
467 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
468 } else
469 mp->m_maxicount = 0;
470 xfs_set_low_space_thresholds(mp);
471
472 /* update secondary superblocks. */
473 for (agno = 1; agno < nagcount; agno++) {
474 error = 0;
475 /*
476 * new secondary superblocks need to be zeroed, not read from
477 * disk as the contents of the new area we are growing into is
478 * completely unknown.
479 */
480 if (agno < oagcount) {
481 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
482 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
483 XFS_FSS_TO_BB(mp, 1), 0, &bp,
484 &xfs_sb_buf_ops);
485 } else {
486 bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
487 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
488 XFS_FSS_TO_BB(mp, 1), 0);
489 if (bp) {
490 bp->b_ops = &xfs_sb_buf_ops;
491 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
492 } else
493 error = ENOMEM;
494 }
495
496 if (error) {
497 xfs_warn(mp,
498 "error %d reading secondary superblock for ag %d",
499 error, agno);
500 break;
501 }
502 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
503
504 /*
505 * If we get an error writing out the alternate superblocks,
506 * just issue a warning and continue. The real work is
507 * already done and committed.
508 */
509 error = xfs_bwrite(bp);
510 xfs_buf_relse(bp);
511 if (error) {
512 xfs_warn(mp,
513 "write error %d updating secondary superblock for ag %d",
514 error, agno);
515 break; /* no point in continuing */
516 }
517 }
518 return error;
519
520 error0:
521 xfs_trans_cancel(tp, XFS_TRANS_ABORT);
522 return error;
523 }
524
525 static int
526 xfs_growfs_log_private(
527 xfs_mount_t *mp, /* mount point for filesystem */
528 xfs_growfs_log_t *in) /* growfs log input struct */
529 {
530 xfs_extlen_t nb;
531
532 nb = in->newblocks;
533 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
534 return XFS_ERROR(EINVAL);
535 if (nb == mp->m_sb.sb_logblocks &&
536 in->isint == (mp->m_sb.sb_logstart != 0))
537 return XFS_ERROR(EINVAL);
538 /*
539 * Moving the log is hard, need new interfaces to sync
540 * the log first, hold off all activity while moving it.
541 * Can have shorter or longer log in the same space,
542 * or transform internal to external log or vice versa.
543 */
544 return XFS_ERROR(ENOSYS);
545 }
546
547 /*
548 * protected versions of growfs function acquire and release locks on the mount
549 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
550 * XFS_IOC_FSGROWFSRT
551 */
552
553
554 int
555 xfs_growfs_data(
556 xfs_mount_t *mp,
557 xfs_growfs_data_t *in)
558 {
559 int error;
560
561 if (!capable(CAP_SYS_ADMIN))
562 return XFS_ERROR(EPERM);
563 if (!mutex_trylock(&mp->m_growlock))
564 return XFS_ERROR(EWOULDBLOCK);
565 error = xfs_growfs_data_private(mp, in);
566 mutex_unlock(&mp->m_growlock);
567 return error;
568 }
569
570 int
571 xfs_growfs_log(
572 xfs_mount_t *mp,
573 xfs_growfs_log_t *in)
574 {
575 int error;
576
577 if (!capable(CAP_SYS_ADMIN))
578 return XFS_ERROR(EPERM);
579 if (!mutex_trylock(&mp->m_growlock))
580 return XFS_ERROR(EWOULDBLOCK);
581 error = xfs_growfs_log_private(mp, in);
582 mutex_unlock(&mp->m_growlock);
583 return error;
584 }
585
586 /*
587 * exported through ioctl XFS_IOC_FSCOUNTS
588 */
589
590 int
591 xfs_fs_counts(
592 xfs_mount_t *mp,
593 xfs_fsop_counts_t *cnt)
594 {
595 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
596 spin_lock(&mp->m_sb_lock);
597 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
598 cnt->freertx = mp->m_sb.sb_frextents;
599 cnt->freeino = mp->m_sb.sb_ifree;
600 cnt->allocino = mp->m_sb.sb_icount;
601 spin_unlock(&mp->m_sb_lock);
602 return 0;
603 }
604
605 /*
606 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
607 *
608 * xfs_reserve_blocks is called to set m_resblks
609 * in the in-core mount table. The number of unused reserved blocks
610 * is kept in m_resblks_avail.
611 *
612 * Reserve the requested number of blocks if available. Otherwise return
613 * as many as possible to satisfy the request. The actual number
614 * reserved are returned in outval
615 *
616 * A null inval pointer indicates that only the current reserved blocks
617 * available should be returned no settings are changed.
618 */
619
620 int
621 xfs_reserve_blocks(
622 xfs_mount_t *mp,
623 __uint64_t *inval,
624 xfs_fsop_resblks_t *outval)
625 {
626 __int64_t lcounter, delta, fdblks_delta;
627 __uint64_t request;
628
629 /* If inval is null, report current values and return */
630 if (inval == (__uint64_t *)NULL) {
631 if (!outval)
632 return EINVAL;
633 outval->resblks = mp->m_resblks;
634 outval->resblks_avail = mp->m_resblks_avail;
635 return 0;
636 }
637
638 request = *inval;
639
640 /*
641 * With per-cpu counters, this becomes an interesting
642 * problem. we needto work out if we are freeing or allocation
643 * blocks first, then we can do the modification as necessary.
644 *
645 * We do this under the m_sb_lock so that if we are near
646 * ENOSPC, we will hold out any changes while we work out
647 * what to do. This means that the amount of free space can
648 * change while we do this, so we need to retry if we end up
649 * trying to reserve more space than is available.
650 *
651 * We also use the xfs_mod_incore_sb() interface so that we
652 * don't have to care about whether per cpu counter are
653 * enabled, disabled or even compiled in....
654 */
655 retry:
656 spin_lock(&mp->m_sb_lock);
657 xfs_icsb_sync_counters_locked(mp, 0);
658
659 /*
660 * If our previous reservation was larger than the current value,
661 * then move any unused blocks back to the free pool.
662 */
663 fdblks_delta = 0;
664 if (mp->m_resblks > request) {
665 lcounter = mp->m_resblks_avail - request;
666 if (lcounter > 0) { /* release unused blocks */
667 fdblks_delta = lcounter;
668 mp->m_resblks_avail -= lcounter;
669 }
670 mp->m_resblks = request;
671 } else {
672 __int64_t free;
673
674 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
675 if (!free)
676 goto out; /* ENOSPC and fdblks_delta = 0 */
677
678 delta = request - mp->m_resblks;
679 lcounter = free - delta;
680 if (lcounter < 0) {
681 /* We can't satisfy the request, just get what we can */
682 mp->m_resblks += free;
683 mp->m_resblks_avail += free;
684 fdblks_delta = -free;
685 } else {
686 fdblks_delta = -delta;
687 mp->m_resblks = request;
688 mp->m_resblks_avail += delta;
689 }
690 }
691 out:
692 if (outval) {
693 outval->resblks = mp->m_resblks;
694 outval->resblks_avail = mp->m_resblks_avail;
695 }
696 spin_unlock(&mp->m_sb_lock);
697
698 if (fdblks_delta) {
699 /*
700 * If we are putting blocks back here, m_resblks_avail is
701 * already at its max so this will put it in the free pool.
702 *
703 * If we need space, we'll either succeed in getting it
704 * from the free block count or we'll get an enospc. If
705 * we get a ENOSPC, it means things changed while we were
706 * calculating fdblks_delta and so we should try again to
707 * see if there is anything left to reserve.
708 *
709 * Don't set the reserved flag here - we don't want to reserve
710 * the extra reserve blocks from the reserve.....
711 */
712 int error;
713 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
714 fdblks_delta, 0);
715 if (error == ENOSPC)
716 goto retry;
717 }
718 return 0;
719 }
720
721 /*
722 * Dump a transaction into the log that contains no real change. This is needed
723 * to be able to make the log dirty or stamp the current tail LSN into the log
724 * during the covering operation.
725 *
726 * We cannot use an inode here for this - that will push dirty state back up
727 * into the VFS and then periodic inode flushing will prevent log covering from
728 * making progress. Hence we log a field in the superblock instead and use a
729 * synchronous transaction to ensure the superblock is immediately unpinned
730 * and can be written back.
731 */
732 int
733 xfs_fs_log_dummy(
734 xfs_mount_t *mp)
735 {
736 xfs_trans_t *tp;
737 int error;
738
739 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
740 error = xfs_trans_reserve(tp, 0, XFS_SB_LOG_RES(mp), 0, 0,
741 XFS_DEFAULT_LOG_COUNT);
742 if (error) {
743 xfs_trans_cancel(tp, 0);
744 return error;
745 }
746
747 /* log the UUID because it is an unchanging field */
748 xfs_mod_sb(tp, XFS_SB_UUID);
749 xfs_trans_set_sync(tp);
750 return xfs_trans_commit(tp, 0);
751 }
752
753 int
754 xfs_fs_goingdown(
755 xfs_mount_t *mp,
756 __uint32_t inflags)
757 {
758 switch (inflags) {
759 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
760 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
761
762 if (sb && !IS_ERR(sb)) {
763 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
764 thaw_bdev(sb->s_bdev, sb);
765 }
766
767 break;
768 }
769 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
770 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
771 break;
772 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
773 xfs_force_shutdown(mp,
774 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
775 break;
776 default:
777 return XFS_ERROR(EINVAL);
778 }
779
780 return 0;
781 }
782
783 /*
784 * Force a shutdown of the filesystem instantly while keeping the filesystem
785 * consistent. We don't do an unmount here; just shutdown the shop, make sure
786 * that absolutely nothing persistent happens to this filesystem after this
787 * point.
788 */
789 void
790 xfs_do_force_shutdown(
791 xfs_mount_t *mp,
792 int flags,
793 char *fname,
794 int lnnum)
795 {
796 int logerror;
797
798 logerror = flags & SHUTDOWN_LOG_IO_ERROR;
799
800 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
801 xfs_notice(mp,
802 "%s(0x%x) called from line %d of file %s. Return address = 0x%p",
803 __func__, flags, lnnum, fname, __return_address);
804 }
805 /*
806 * No need to duplicate efforts.
807 */
808 if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
809 return;
810
811 /*
812 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
813 * queue up anybody new on the log reservations, and wakes up
814 * everybody who's sleeping on log reservations to tell them
815 * the bad news.
816 */
817 if (xfs_log_force_umount(mp, logerror))
818 return;
819
820 if (flags & SHUTDOWN_CORRUPT_INCORE) {
821 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
822 "Corruption of in-memory data detected. Shutting down filesystem");
823 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
824 xfs_stack_trace();
825 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
826 if (logerror) {
827 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
828 "Log I/O Error Detected. Shutting down filesystem");
829 } else if (flags & SHUTDOWN_DEVICE_REQ) {
830 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
831 "All device paths lost. Shutting down filesystem");
832 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
833 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
834 "I/O Error Detected. Shutting down filesystem");
835 }
836 }
837 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
838 xfs_alert(mp,
839 "Please umount the filesystem and rectify the problem(s)");
840 }
841 }
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