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xfs: create a shared header file for format-related information
[deliverable/linux.git] / fs / xfs / xfs_fsops.c
1 /*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_types.h"
21 #include "xfs_format.h"
22 #include "xfs_shared.h"
23 #include "xfs_log.h"
24 #include "xfs_trans.h"
25 #include "xfs_sb.h"
26 #include "xfs_ag.h"
27 #include "xfs_mount.h"
28 #include "xfs_bmap_btree.h"
29 #include "xfs_alloc_btree.h"
30 #include "xfs_ialloc_btree.h"
31 #include "xfs_dinode.h"
32 #include "xfs_inode.h"
33 #include "xfs_inode_item.h"
34 #include "xfs_btree.h"
35 #include "xfs_error.h"
36 #include "xfs_alloc.h"
37 #include "xfs_ialloc.h"
38 #include "xfs_fsops.h"
39 #include "xfs_itable.h"
40 #include "xfs_trans_space.h"
41 #include "xfs_rtalloc.h"
42 #include "xfs_filestream.h"
43 #include "xfs_trace.h"
44
45 /*
46 * File system operations
47 */
48
49 int
50 xfs_fs_geometry(
51 xfs_mount_t *mp,
52 xfs_fsop_geom_t *geo,
53 int new_version)
54 {
55
56 memset(geo, 0, sizeof(*geo));
57
58 geo->blocksize = mp->m_sb.sb_blocksize;
59 geo->rtextsize = mp->m_sb.sb_rextsize;
60 geo->agblocks = mp->m_sb.sb_agblocks;
61 geo->agcount = mp->m_sb.sb_agcount;
62 geo->logblocks = mp->m_sb.sb_logblocks;
63 geo->sectsize = mp->m_sb.sb_sectsize;
64 geo->inodesize = mp->m_sb.sb_inodesize;
65 geo->imaxpct = mp->m_sb.sb_imax_pct;
66 geo->datablocks = mp->m_sb.sb_dblocks;
67 geo->rtblocks = mp->m_sb.sb_rblocks;
68 geo->rtextents = mp->m_sb.sb_rextents;
69 geo->logstart = mp->m_sb.sb_logstart;
70 ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
71 memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
72 if (new_version >= 2) {
73 geo->sunit = mp->m_sb.sb_unit;
74 geo->swidth = mp->m_sb.sb_width;
75 }
76 if (new_version >= 3) {
77 geo->version = XFS_FSOP_GEOM_VERSION;
78 geo->flags =
79 (xfs_sb_version_hasattr(&mp->m_sb) ?
80 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
81 (xfs_sb_version_hasnlink(&mp->m_sb) ?
82 XFS_FSOP_GEOM_FLAGS_NLINK : 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_hasshared(&mp->m_sb) ?
90 XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
91 (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
92 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
93 (xfs_sb_version_hasdirv2(&mp->m_sb) ?
94 XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) |
95 (xfs_sb_version_hassector(&mp->m_sb) ?
96 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
97 (xfs_sb_version_hasasciici(&mp->m_sb) ?
98 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
99 (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
100 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
101 (xfs_sb_version_hasattr2(&mp->m_sb) ?
102 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) |
103 (xfs_sb_version_hasprojid32bit(&mp->m_sb) ?
104 XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) |
105 (xfs_sb_version_hascrc(&mp->m_sb) ?
106 XFS_FSOP_GEOM_FLAGS_V5SB : 0) |
107 (xfs_sb_version_hasftype(&mp->m_sb) ?
108 XFS_FSOP_GEOM_FLAGS_FTYPE : 0);
109 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
110 mp->m_sb.sb_logsectsize : BBSIZE;
111 geo->rtsectsize = mp->m_sb.sb_blocksize;
112 geo->dirblocksize = mp->m_dirblksize;
113 }
114 if (new_version >= 4) {
115 geo->flags |=
116 (xfs_sb_version_haslogv2(&mp->m_sb) ?
117 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
118 geo->logsunit = mp->m_sb.sb_logsunit;
119 }
120 return 0;
121 }
122
123 static struct xfs_buf *
124 xfs_growfs_get_hdr_buf(
125 struct xfs_mount *mp,
126 xfs_daddr_t blkno,
127 size_t numblks,
128 int flags,
129 const struct xfs_buf_ops *ops)
130 {
131 struct xfs_buf *bp;
132
133 bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
134 if (!bp)
135 return NULL;
136
137 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
138 bp->b_bn = blkno;
139 bp->b_maps[0].bm_bn = blkno;
140 bp->b_ops = ops;
141
142 return bp;
143 }
144
145 static int
146 xfs_growfs_data_private(
147 xfs_mount_t *mp, /* mount point for filesystem */
148 xfs_growfs_data_t *in) /* growfs data input struct */
149 {
150 xfs_agf_t *agf;
151 struct xfs_agfl *agfl;
152 xfs_agi_t *agi;
153 xfs_agnumber_t agno;
154 xfs_extlen_t agsize;
155 xfs_extlen_t tmpsize;
156 xfs_alloc_rec_t *arec;
157 xfs_buf_t *bp;
158 int bucket;
159 int dpct;
160 int error, saved_error = 0;
161 xfs_agnumber_t nagcount;
162 xfs_agnumber_t nagimax = 0;
163 xfs_rfsblock_t nb, nb_mod;
164 xfs_rfsblock_t new;
165 xfs_rfsblock_t nfree;
166 xfs_agnumber_t oagcount;
167 int pct;
168 xfs_trans_t *tp;
169
170 nb = in->newblocks;
171 pct = in->imaxpct;
172 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
173 return XFS_ERROR(EINVAL);
174 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
175 return error;
176 dpct = pct - mp->m_sb.sb_imax_pct;
177 bp = xfs_buf_read_uncached(mp->m_ddev_targp,
178 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
179 XFS_FSS_TO_BB(mp, 1), 0, NULL);
180 if (!bp)
181 return EIO;
182 if (bp->b_error) {
183 error = bp->b_error;
184 xfs_buf_relse(bp);
185 return error;
186 }
187 xfs_buf_relse(bp);
188
189 new = nb; /* use new as a temporary here */
190 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
191 nagcount = new + (nb_mod != 0);
192 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
193 nagcount--;
194 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
195 if (nb < mp->m_sb.sb_dblocks)
196 return XFS_ERROR(EINVAL);
197 }
198 new = nb - mp->m_sb.sb_dblocks;
199 oagcount = mp->m_sb.sb_agcount;
200
201 /* allocate the new per-ag structures */
202 if (nagcount > oagcount) {
203 error = xfs_initialize_perag(mp, nagcount, &nagimax);
204 if (error)
205 return error;
206 }
207
208 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
209 tp->t_flags |= XFS_TRANS_RESERVE;
210 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growdata,
211 XFS_GROWFS_SPACE_RES(mp), 0);
212 if (error) {
213 xfs_trans_cancel(tp, 0);
214 return error;
215 }
216
217 /*
218 * Write new AG headers to disk. Non-transactional, but written
219 * synchronously so they are completed prior to the growfs transaction
220 * being logged.
221 */
222 nfree = 0;
223 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
224 /*
225 * AG freespace header block
226 */
227 bp = xfs_growfs_get_hdr_buf(mp,
228 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
229 XFS_FSS_TO_BB(mp, 1), 0,
230 &xfs_agf_buf_ops);
231 if (!bp) {
232 error = ENOMEM;
233 goto error0;
234 }
235
236 agf = XFS_BUF_TO_AGF(bp);
237 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
238 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
239 agf->agf_seqno = cpu_to_be32(agno);
240 if (agno == nagcount - 1)
241 agsize =
242 nb -
243 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
244 else
245 agsize = mp->m_sb.sb_agblocks;
246 agf->agf_length = cpu_to_be32(agsize);
247 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
248 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
249 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
250 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
251 agf->agf_flfirst = 0;
252 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
253 agf->agf_flcount = 0;
254 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
255 agf->agf_freeblks = cpu_to_be32(tmpsize);
256 agf->agf_longest = cpu_to_be32(tmpsize);
257 if (xfs_sb_version_hascrc(&mp->m_sb))
258 uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_uuid);
259
260 error = xfs_bwrite(bp);
261 xfs_buf_relse(bp);
262 if (error)
263 goto error0;
264
265 /*
266 * AG freelist header block
267 */
268 bp = xfs_growfs_get_hdr_buf(mp,
269 XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)),
270 XFS_FSS_TO_BB(mp, 1), 0,
271 &xfs_agfl_buf_ops);
272 if (!bp) {
273 error = ENOMEM;
274 goto error0;
275 }
276
277 agfl = XFS_BUF_TO_AGFL(bp);
278 if (xfs_sb_version_hascrc(&mp->m_sb)) {
279 agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
280 agfl->agfl_seqno = cpu_to_be32(agno);
281 uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_uuid);
282 }
283 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
284 agfl->agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
285
286 error = xfs_bwrite(bp);
287 xfs_buf_relse(bp);
288 if (error)
289 goto error0;
290
291 /*
292 * AG inode header block
293 */
294 bp = xfs_growfs_get_hdr_buf(mp,
295 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
296 XFS_FSS_TO_BB(mp, 1), 0,
297 &xfs_agi_buf_ops);
298 if (!bp) {
299 error = ENOMEM;
300 goto error0;
301 }
302
303 agi = XFS_BUF_TO_AGI(bp);
304 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
305 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
306 agi->agi_seqno = cpu_to_be32(agno);
307 agi->agi_length = cpu_to_be32(agsize);
308 agi->agi_count = 0;
309 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
310 agi->agi_level = cpu_to_be32(1);
311 agi->agi_freecount = 0;
312 agi->agi_newino = cpu_to_be32(NULLAGINO);
313 agi->agi_dirino = cpu_to_be32(NULLAGINO);
314 if (xfs_sb_version_hascrc(&mp->m_sb))
315 uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_uuid);
316 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
317 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
318
319 error = xfs_bwrite(bp);
320 xfs_buf_relse(bp);
321 if (error)
322 goto error0;
323
324 /*
325 * BNO btree root block
326 */
327 bp = xfs_growfs_get_hdr_buf(mp,
328 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
329 BTOBB(mp->m_sb.sb_blocksize), 0,
330 &xfs_allocbt_buf_ops);
331
332 if (!bp) {
333 error = ENOMEM;
334 goto error0;
335 }
336
337 if (xfs_sb_version_hascrc(&mp->m_sb))
338 xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1,
339 agno, XFS_BTREE_CRC_BLOCKS);
340 else
341 xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1,
342 agno, 0);
343
344 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
345 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
346 arec->ar_blockcount = cpu_to_be32(
347 agsize - be32_to_cpu(arec->ar_startblock));
348
349 error = xfs_bwrite(bp);
350 xfs_buf_relse(bp);
351 if (error)
352 goto error0;
353
354 /*
355 * CNT btree root block
356 */
357 bp = xfs_growfs_get_hdr_buf(mp,
358 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
359 BTOBB(mp->m_sb.sb_blocksize), 0,
360 &xfs_allocbt_buf_ops);
361 if (!bp) {
362 error = ENOMEM;
363 goto error0;
364 }
365
366 if (xfs_sb_version_hascrc(&mp->m_sb))
367 xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1,
368 agno, XFS_BTREE_CRC_BLOCKS);
369 else
370 xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1,
371 agno, 0);
372
373 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
374 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
375 arec->ar_blockcount = cpu_to_be32(
376 agsize - be32_to_cpu(arec->ar_startblock));
377 nfree += be32_to_cpu(arec->ar_blockcount);
378
379 error = xfs_bwrite(bp);
380 xfs_buf_relse(bp);
381 if (error)
382 goto error0;
383
384 /*
385 * INO btree root block
386 */
387 bp = xfs_growfs_get_hdr_buf(mp,
388 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
389 BTOBB(mp->m_sb.sb_blocksize), 0,
390 &xfs_inobt_buf_ops);
391 if (!bp) {
392 error = ENOMEM;
393 goto error0;
394 }
395
396 if (xfs_sb_version_hascrc(&mp->m_sb))
397 xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0,
398 agno, XFS_BTREE_CRC_BLOCKS);
399 else
400 xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0,
401 agno, 0);
402
403 error = xfs_bwrite(bp);
404 xfs_buf_relse(bp);
405 if (error)
406 goto error0;
407 }
408 xfs_trans_agblocks_delta(tp, nfree);
409 /*
410 * There are new blocks in the old last a.g.
411 */
412 if (new) {
413 /*
414 * Change the agi length.
415 */
416 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
417 if (error) {
418 goto error0;
419 }
420 ASSERT(bp);
421 agi = XFS_BUF_TO_AGI(bp);
422 be32_add_cpu(&agi->agi_length, new);
423 ASSERT(nagcount == oagcount ||
424 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
425 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
426 /*
427 * Change agf length.
428 */
429 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
430 if (error) {
431 goto error0;
432 }
433 ASSERT(bp);
434 agf = XFS_BUF_TO_AGF(bp);
435 be32_add_cpu(&agf->agf_length, new);
436 ASSERT(be32_to_cpu(agf->agf_length) ==
437 be32_to_cpu(agi->agi_length));
438
439 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
440 /*
441 * Free the new space.
442 */
443 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
444 be32_to_cpu(agf->agf_length) - new), new);
445 if (error) {
446 goto error0;
447 }
448 }
449
450 /*
451 * Update changed superblock fields transactionally. These are not
452 * seen by the rest of the world until the transaction commit applies
453 * them atomically to the superblock.
454 */
455 if (nagcount > oagcount)
456 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
457 if (nb > mp->m_sb.sb_dblocks)
458 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
459 nb - mp->m_sb.sb_dblocks);
460 if (nfree)
461 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
462 if (dpct)
463 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
464 error = xfs_trans_commit(tp, 0);
465 if (error)
466 return error;
467
468 /* New allocation groups fully initialized, so update mount struct */
469 if (nagimax)
470 mp->m_maxagi = nagimax;
471 if (mp->m_sb.sb_imax_pct) {
472 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
473 do_div(icount, 100);
474 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
475 } else
476 mp->m_maxicount = 0;
477 xfs_set_low_space_thresholds(mp);
478
479 /* update secondary superblocks. */
480 for (agno = 1; agno < nagcount; agno++) {
481 error = 0;
482 /*
483 * new secondary superblocks need to be zeroed, not read from
484 * disk as the contents of the new area we are growing into is
485 * completely unknown.
486 */
487 if (agno < oagcount) {
488 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
489 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
490 XFS_FSS_TO_BB(mp, 1), 0, &bp,
491 &xfs_sb_buf_ops);
492 } else {
493 bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
494 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
495 XFS_FSS_TO_BB(mp, 1), 0);
496 if (bp) {
497 bp->b_ops = &xfs_sb_buf_ops;
498 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
499 } else
500 error = ENOMEM;
501 }
502
503 /*
504 * If we get an error reading or writing alternate superblocks,
505 * continue. xfs_repair chooses the "best" superblock based
506 * on most matches; if we break early, we'll leave more
507 * superblocks un-updated than updated, and xfs_repair may
508 * pick them over the properly-updated primary.
509 */
510 if (error) {
511 xfs_warn(mp,
512 "error %d reading secondary superblock for ag %d",
513 error, agno);
514 saved_error = error;
515 continue;
516 }
517 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
518
519 error = xfs_bwrite(bp);
520 xfs_buf_relse(bp);
521 if (error) {
522 xfs_warn(mp,
523 "write error %d updating secondary superblock for ag %d",
524 error, agno);
525 saved_error = error;
526 continue;
527 }
528 }
529 return saved_error ? saved_error : error;
530
531 error0:
532 xfs_trans_cancel(tp, XFS_TRANS_ABORT);
533 return error;
534 }
535
536 static int
537 xfs_growfs_log_private(
538 xfs_mount_t *mp, /* mount point for filesystem */
539 xfs_growfs_log_t *in) /* growfs log input struct */
540 {
541 xfs_extlen_t nb;
542
543 nb = in->newblocks;
544 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
545 return XFS_ERROR(EINVAL);
546 if (nb == mp->m_sb.sb_logblocks &&
547 in->isint == (mp->m_sb.sb_logstart != 0))
548 return XFS_ERROR(EINVAL);
549 /*
550 * Moving the log is hard, need new interfaces to sync
551 * the log first, hold off all activity while moving it.
552 * Can have shorter or longer log in the same space,
553 * or transform internal to external log or vice versa.
554 */
555 return XFS_ERROR(ENOSYS);
556 }
557
558 /*
559 * protected versions of growfs function acquire and release locks on the mount
560 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
561 * XFS_IOC_FSGROWFSRT
562 */
563
564
565 int
566 xfs_growfs_data(
567 xfs_mount_t *mp,
568 xfs_growfs_data_t *in)
569 {
570 int error;
571
572 if (!capable(CAP_SYS_ADMIN))
573 return XFS_ERROR(EPERM);
574 if (!mutex_trylock(&mp->m_growlock))
575 return XFS_ERROR(EWOULDBLOCK);
576 error = xfs_growfs_data_private(mp, in);
577 mutex_unlock(&mp->m_growlock);
578 return error;
579 }
580
581 int
582 xfs_growfs_log(
583 xfs_mount_t *mp,
584 xfs_growfs_log_t *in)
585 {
586 int error;
587
588 if (!capable(CAP_SYS_ADMIN))
589 return XFS_ERROR(EPERM);
590 if (!mutex_trylock(&mp->m_growlock))
591 return XFS_ERROR(EWOULDBLOCK);
592 error = xfs_growfs_log_private(mp, in);
593 mutex_unlock(&mp->m_growlock);
594 return error;
595 }
596
597 /*
598 * exported through ioctl XFS_IOC_FSCOUNTS
599 */
600
601 int
602 xfs_fs_counts(
603 xfs_mount_t *mp,
604 xfs_fsop_counts_t *cnt)
605 {
606 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
607 spin_lock(&mp->m_sb_lock);
608 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
609 cnt->freertx = mp->m_sb.sb_frextents;
610 cnt->freeino = mp->m_sb.sb_ifree;
611 cnt->allocino = mp->m_sb.sb_icount;
612 spin_unlock(&mp->m_sb_lock);
613 return 0;
614 }
615
616 /*
617 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
618 *
619 * xfs_reserve_blocks is called to set m_resblks
620 * in the in-core mount table. The number of unused reserved blocks
621 * is kept in m_resblks_avail.
622 *
623 * Reserve the requested number of blocks if available. Otherwise return
624 * as many as possible to satisfy the request. The actual number
625 * reserved are returned in outval
626 *
627 * A null inval pointer indicates that only the current reserved blocks
628 * available should be returned no settings are changed.
629 */
630
631 int
632 xfs_reserve_blocks(
633 xfs_mount_t *mp,
634 __uint64_t *inval,
635 xfs_fsop_resblks_t *outval)
636 {
637 __int64_t lcounter, delta, fdblks_delta;
638 __uint64_t request;
639
640 /* If inval is null, report current values and return */
641 if (inval == (__uint64_t *)NULL) {
642 if (!outval)
643 return EINVAL;
644 outval->resblks = mp->m_resblks;
645 outval->resblks_avail = mp->m_resblks_avail;
646 return 0;
647 }
648
649 request = *inval;
650
651 /*
652 * With per-cpu counters, this becomes an interesting
653 * problem. we needto work out if we are freeing or allocation
654 * blocks first, then we can do the modification as necessary.
655 *
656 * We do this under the m_sb_lock so that if we are near
657 * ENOSPC, we will hold out any changes while we work out
658 * what to do. This means that the amount of free space can
659 * change while we do this, so we need to retry if we end up
660 * trying to reserve more space than is available.
661 *
662 * We also use the xfs_mod_incore_sb() interface so that we
663 * don't have to care about whether per cpu counter are
664 * enabled, disabled or even compiled in....
665 */
666 retry:
667 spin_lock(&mp->m_sb_lock);
668 xfs_icsb_sync_counters_locked(mp, 0);
669
670 /*
671 * If our previous reservation was larger than the current value,
672 * then move any unused blocks back to the free pool.
673 */
674 fdblks_delta = 0;
675 if (mp->m_resblks > request) {
676 lcounter = mp->m_resblks_avail - request;
677 if (lcounter > 0) { /* release unused blocks */
678 fdblks_delta = lcounter;
679 mp->m_resblks_avail -= lcounter;
680 }
681 mp->m_resblks = request;
682 } else {
683 __int64_t free;
684
685 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
686 if (!free)
687 goto out; /* ENOSPC and fdblks_delta = 0 */
688
689 delta = request - mp->m_resblks;
690 lcounter = free - delta;
691 if (lcounter < 0) {
692 /* We can't satisfy the request, just get what we can */
693 mp->m_resblks += free;
694 mp->m_resblks_avail += free;
695 fdblks_delta = -free;
696 } else {
697 fdblks_delta = -delta;
698 mp->m_resblks = request;
699 mp->m_resblks_avail += delta;
700 }
701 }
702 out:
703 if (outval) {
704 outval->resblks = mp->m_resblks;
705 outval->resblks_avail = mp->m_resblks_avail;
706 }
707 spin_unlock(&mp->m_sb_lock);
708
709 if (fdblks_delta) {
710 /*
711 * If we are putting blocks back here, m_resblks_avail is
712 * already at its max so this will put it in the free pool.
713 *
714 * If we need space, we'll either succeed in getting it
715 * from the free block count or we'll get an enospc. If
716 * we get a ENOSPC, it means things changed while we were
717 * calculating fdblks_delta and so we should try again to
718 * see if there is anything left to reserve.
719 *
720 * Don't set the reserved flag here - we don't want to reserve
721 * the extra reserve blocks from the reserve.....
722 */
723 int error;
724 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
725 fdblks_delta, 0);
726 if (error == ENOSPC)
727 goto retry;
728 }
729 return 0;
730 }
731
732 /*
733 * Dump a transaction into the log that contains no real change. This is needed
734 * to be able to make the log dirty or stamp the current tail LSN into the log
735 * during the covering operation.
736 *
737 * We cannot use an inode here for this - that will push dirty state back up
738 * into the VFS and then periodic inode flushing will prevent log covering from
739 * making progress. Hence we log a field in the superblock instead and use a
740 * synchronous transaction to ensure the superblock is immediately unpinned
741 * and can be written back.
742 */
743 int
744 xfs_fs_log_dummy(
745 xfs_mount_t *mp)
746 {
747 xfs_trans_t *tp;
748 int error;
749
750 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
751 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_sb, 0, 0);
752 if (error) {
753 xfs_trans_cancel(tp, 0);
754 return error;
755 }
756
757 /* log the UUID because it is an unchanging field */
758 xfs_mod_sb(tp, XFS_SB_UUID);
759 xfs_trans_set_sync(tp);
760 return xfs_trans_commit(tp, 0);
761 }
762
763 int
764 xfs_fs_goingdown(
765 xfs_mount_t *mp,
766 __uint32_t inflags)
767 {
768 switch (inflags) {
769 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
770 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
771
772 if (sb && !IS_ERR(sb)) {
773 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
774 thaw_bdev(sb->s_bdev, sb);
775 }
776
777 break;
778 }
779 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
780 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
781 break;
782 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
783 xfs_force_shutdown(mp,
784 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
785 break;
786 default:
787 return XFS_ERROR(EINVAL);
788 }
789
790 return 0;
791 }
792
793 /*
794 * Force a shutdown of the filesystem instantly while keeping the filesystem
795 * consistent. We don't do an unmount here; just shutdown the shop, make sure
796 * that absolutely nothing persistent happens to this filesystem after this
797 * point.
798 */
799 void
800 xfs_do_force_shutdown(
801 xfs_mount_t *mp,
802 int flags,
803 char *fname,
804 int lnnum)
805 {
806 int logerror;
807
808 logerror = flags & SHUTDOWN_LOG_IO_ERROR;
809
810 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
811 xfs_notice(mp,
812 "%s(0x%x) called from line %d of file %s. Return address = 0x%p",
813 __func__, flags, lnnum, fname, __return_address);
814 }
815 /*
816 * No need to duplicate efforts.
817 */
818 if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
819 return;
820
821 /*
822 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
823 * queue up anybody new on the log reservations, and wakes up
824 * everybody who's sleeping on log reservations to tell them
825 * the bad news.
826 */
827 if (xfs_log_force_umount(mp, logerror))
828 return;
829
830 if (flags & SHUTDOWN_CORRUPT_INCORE) {
831 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
832 "Corruption of in-memory data detected. Shutting down filesystem");
833 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
834 xfs_stack_trace();
835 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
836 if (logerror) {
837 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
838 "Log I/O Error Detected. Shutting down filesystem");
839 } else if (flags & SHUTDOWN_DEVICE_REQ) {
840 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
841 "All device paths lost. Shutting down filesystem");
842 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
843 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
844 "I/O Error Detected. Shutting down filesystem");
845 }
846 }
847 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
848 xfs_alert(mp,
849 "Please umount the filesystem and rectify the problem(s)");
850 }
851 }
Linux kernel - Deliverables
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