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xfs: global error sign conversion
[deliverable/linux.git] / fs / xfs / xfs_fsops.c
1 /*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_shared.h"
21 #include "xfs_format.h"
22 #include "xfs_log_format.h"
23 #include "xfs_trans_resv.h"
24 #include "xfs_sb.h"
25 #include "xfs_ag.h"
26 #include "xfs_mount.h"
27 #include "xfs_da_format.h"
28 #include "xfs_da_btree.h"
29 #include "xfs_inode.h"
30 #include "xfs_trans.h"
31 #include "xfs_inode_item.h"
32 #include "xfs_error.h"
33 #include "xfs_btree.h"
34 #include "xfs_alloc_btree.h"
35 #include "xfs_alloc.h"
36 #include "xfs_ialloc.h"
37 #include "xfs_fsops.h"
38 #include "xfs_itable.h"
39 #include "xfs_trans_space.h"
40 #include "xfs_rtalloc.h"
41 #include "xfs_trace.h"
42 #include "xfs_log.h"
43 #include "xfs_dinode.h"
44 #include "xfs_filestream.h"
45
46 /*
47 * File system operations
48 */
49
50 int
51 xfs_fs_geometry(
52 xfs_mount_t *mp,
53 xfs_fsop_geom_t *geo,
54 int new_version)
55 {
56
57 memset(geo, 0, sizeof(*geo));
58
59 geo->blocksize = mp->m_sb.sb_blocksize;
60 geo->rtextsize = mp->m_sb.sb_rextsize;
61 geo->agblocks = mp->m_sb.sb_agblocks;
62 geo->agcount = mp->m_sb.sb_agcount;
63 geo->logblocks = mp->m_sb.sb_logblocks;
64 geo->sectsize = mp->m_sb.sb_sectsize;
65 geo->inodesize = mp->m_sb.sb_inodesize;
66 geo->imaxpct = mp->m_sb.sb_imax_pct;
67 geo->datablocks = mp->m_sb.sb_dblocks;
68 geo->rtblocks = mp->m_sb.sb_rblocks;
69 geo->rtextents = mp->m_sb.sb_rextents;
70 geo->logstart = mp->m_sb.sb_logstart;
71 ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
72 memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
73 if (new_version >= 2) {
74 geo->sunit = mp->m_sb.sb_unit;
75 geo->swidth = mp->m_sb.sb_width;
76 }
77 if (new_version >= 3) {
78 geo->version = XFS_FSOP_GEOM_VERSION;
79 geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK |
80 XFS_FSOP_GEOM_FLAGS_DIRV2 |
81 (xfs_sb_version_hasattr(&mp->m_sb) ?
82 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
83 (xfs_sb_version_hasquota(&mp->m_sb) ?
84 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
85 (xfs_sb_version_hasalign(&mp->m_sb) ?
86 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
87 (xfs_sb_version_hasdalign(&mp->m_sb) ?
88 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
89 (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
90 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
91 (xfs_sb_version_hassector(&mp->m_sb) ?
92 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
93 (xfs_sb_version_hasasciici(&mp->m_sb) ?
94 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
95 (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
96 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
97 (xfs_sb_version_hasattr2(&mp->m_sb) ?
98 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) |
99 (xfs_sb_version_hasprojid32bit(&mp->m_sb) ?
100 XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) |
101 (xfs_sb_version_hascrc(&mp->m_sb) ?
102 XFS_FSOP_GEOM_FLAGS_V5SB : 0) |
103 (xfs_sb_version_hasftype(&mp->m_sb) ?
104 XFS_FSOP_GEOM_FLAGS_FTYPE : 0) |
105 (xfs_sb_version_hasfinobt(&mp->m_sb) ?
106 XFS_FSOP_GEOM_FLAGS_FINOBT : 0);
107 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
108 mp->m_sb.sb_logsectsize : BBSIZE;
109 geo->rtsectsize = mp->m_sb.sb_blocksize;
110 geo->dirblocksize = mp->m_dir_geo->blksize;
111 }
112 if (new_version >= 4) {
113 geo->flags |=
114 (xfs_sb_version_haslogv2(&mp->m_sb) ?
115 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
116 geo->logsunit = mp->m_sb.sb_logsunit;
117 }
118 return 0;
119 }
120
121 static struct xfs_buf *
122 xfs_growfs_get_hdr_buf(
123 struct xfs_mount *mp,
124 xfs_daddr_t blkno,
125 size_t numblks,
126 int flags,
127 const struct xfs_buf_ops *ops)
128 {
129 struct xfs_buf *bp;
130
131 bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
132 if (!bp)
133 return NULL;
134
135 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
136 bp->b_bn = blkno;
137 bp->b_maps[0].bm_bn = blkno;
138 bp->b_ops = ops;
139
140 return bp;
141 }
142
143 static int
144 xfs_growfs_data_private(
145 xfs_mount_t *mp, /* mount point for filesystem */
146 xfs_growfs_data_t *in) /* growfs data input struct */
147 {
148 xfs_agf_t *agf;
149 struct xfs_agfl *agfl;
150 xfs_agi_t *agi;
151 xfs_agnumber_t agno;
152 xfs_extlen_t agsize;
153 xfs_extlen_t tmpsize;
154 xfs_alloc_rec_t *arec;
155 xfs_buf_t *bp;
156 int bucket;
157 int dpct;
158 int error, saved_error = 0;
159 xfs_agnumber_t nagcount;
160 xfs_agnumber_t nagimax = 0;
161 xfs_rfsblock_t nb, nb_mod;
162 xfs_rfsblock_t new;
163 xfs_rfsblock_t nfree;
164 xfs_agnumber_t oagcount;
165 int pct;
166 xfs_trans_t *tp;
167
168 nb = in->newblocks;
169 pct = in->imaxpct;
170 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
171 return -EINVAL;
172 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
173 return error;
174 dpct = pct - mp->m_sb.sb_imax_pct;
175 bp = 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, NULL);
178 if (!bp)
179 return -EIO;
180 if (bp->b_error) {
181 error = bp->b_error;
182 xfs_buf_relse(bp);
183 return error;
184 }
185 xfs_buf_relse(bp);
186
187 new = nb; /* use new as a temporary here */
188 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
189 nagcount = new + (nb_mod != 0);
190 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
191 nagcount--;
192 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
193 if (nb < mp->m_sb.sb_dblocks)
194 return -EINVAL;
195 }
196 new = nb - mp->m_sb.sb_dblocks;
197 oagcount = mp->m_sb.sb_agcount;
198
199 /* allocate the new per-ag structures */
200 if (nagcount > oagcount) {
201 error = xfs_initialize_perag(mp, nagcount, &nagimax);
202 if (error)
203 return error;
204 }
205
206 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
207 tp->t_flags |= XFS_TRANS_RESERVE;
208 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growdata,
209 XFS_GROWFS_SPACE_RES(mp), 0);
210 if (error) {
211 xfs_trans_cancel(tp, 0);
212 return error;
213 }
214
215 /*
216 * Write new AG headers to disk. Non-transactional, but written
217 * synchronously so they are completed prior to the growfs transaction
218 * being logged.
219 */
220 nfree = 0;
221 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
222 __be32 *agfl_bno;
223
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
284 agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
285 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
286 agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
287
288 error = xfs_bwrite(bp);
289 xfs_buf_relse(bp);
290 if (error)
291 goto error0;
292
293 /*
294 * AG inode header block
295 */
296 bp = xfs_growfs_get_hdr_buf(mp,
297 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
298 XFS_FSS_TO_BB(mp, 1), 0,
299 &xfs_agi_buf_ops);
300 if (!bp) {
301 error = -ENOMEM;
302 goto error0;
303 }
304
305 agi = XFS_BUF_TO_AGI(bp);
306 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
307 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
308 agi->agi_seqno = cpu_to_be32(agno);
309 agi->agi_length = cpu_to_be32(agsize);
310 agi->agi_count = 0;
311 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
312 agi->agi_level = cpu_to_be32(1);
313 agi->agi_freecount = 0;
314 agi->agi_newino = cpu_to_be32(NULLAGINO);
315 agi->agi_dirino = cpu_to_be32(NULLAGINO);
316 if (xfs_sb_version_hascrc(&mp->m_sb))
317 uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_uuid);
318 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
319 agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp));
320 agi->agi_free_level = cpu_to_be32(1);
321 }
322 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
323 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
324
325 error = xfs_bwrite(bp);
326 xfs_buf_relse(bp);
327 if (error)
328 goto error0;
329
330 /*
331 * BNO btree root block
332 */
333 bp = xfs_growfs_get_hdr_buf(mp,
334 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
335 BTOBB(mp->m_sb.sb_blocksize), 0,
336 &xfs_allocbt_buf_ops);
337
338 if (!bp) {
339 error = -ENOMEM;
340 goto error0;
341 }
342
343 if (xfs_sb_version_hascrc(&mp->m_sb))
344 xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1,
345 agno, XFS_BTREE_CRC_BLOCKS);
346 else
347 xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1,
348 agno, 0);
349
350 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
351 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
352 arec->ar_blockcount = cpu_to_be32(
353 agsize - be32_to_cpu(arec->ar_startblock));
354
355 error = xfs_bwrite(bp);
356 xfs_buf_relse(bp);
357 if (error)
358 goto error0;
359
360 /*
361 * CNT btree root block
362 */
363 bp = xfs_growfs_get_hdr_buf(mp,
364 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
365 BTOBB(mp->m_sb.sb_blocksize), 0,
366 &xfs_allocbt_buf_ops);
367 if (!bp) {
368 error = -ENOMEM;
369 goto error0;
370 }
371
372 if (xfs_sb_version_hascrc(&mp->m_sb))
373 xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1,
374 agno, XFS_BTREE_CRC_BLOCKS);
375 else
376 xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1,
377 agno, 0);
378
379 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
380 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
381 arec->ar_blockcount = cpu_to_be32(
382 agsize - be32_to_cpu(arec->ar_startblock));
383 nfree += be32_to_cpu(arec->ar_blockcount);
384
385 error = xfs_bwrite(bp);
386 xfs_buf_relse(bp);
387 if (error)
388 goto error0;
389
390 /*
391 * INO btree root block
392 */
393 bp = xfs_growfs_get_hdr_buf(mp,
394 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
395 BTOBB(mp->m_sb.sb_blocksize), 0,
396 &xfs_inobt_buf_ops);
397 if (!bp) {
398 error = -ENOMEM;
399 goto error0;
400 }
401
402 if (xfs_sb_version_hascrc(&mp->m_sb))
403 xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0,
404 agno, XFS_BTREE_CRC_BLOCKS);
405 else
406 xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0,
407 agno, 0);
408
409 error = xfs_bwrite(bp);
410 xfs_buf_relse(bp);
411 if (error)
412 goto error0;
413
414 /*
415 * FINO btree root block
416 */
417 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
418 bp = xfs_growfs_get_hdr_buf(mp,
419 XFS_AGB_TO_DADDR(mp, agno, XFS_FIBT_BLOCK(mp)),
420 BTOBB(mp->m_sb.sb_blocksize), 0,
421 &xfs_inobt_buf_ops);
422 if (!bp) {
423 error = -ENOMEM;
424 goto error0;
425 }
426
427 if (xfs_sb_version_hascrc(&mp->m_sb))
428 xfs_btree_init_block(mp, bp, XFS_FIBT_CRC_MAGIC,
429 0, 0, agno,
430 XFS_BTREE_CRC_BLOCKS);
431 else
432 xfs_btree_init_block(mp, bp, XFS_FIBT_MAGIC, 0,
433 0, agno, 0);
434
435 error = xfs_bwrite(bp);
436 xfs_buf_relse(bp);
437 if (error)
438 goto error0;
439 }
440
441 }
442 xfs_trans_agblocks_delta(tp, nfree);
443 /*
444 * There are new blocks in the old last a.g.
445 */
446 if (new) {
447 /*
448 * Change the agi length.
449 */
450 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
451 if (error) {
452 goto error0;
453 }
454 ASSERT(bp);
455 agi = XFS_BUF_TO_AGI(bp);
456 be32_add_cpu(&agi->agi_length, new);
457 ASSERT(nagcount == oagcount ||
458 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
459 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
460 /*
461 * Change agf length.
462 */
463 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
464 if (error) {
465 goto error0;
466 }
467 ASSERT(bp);
468 agf = XFS_BUF_TO_AGF(bp);
469 be32_add_cpu(&agf->agf_length, new);
470 ASSERT(be32_to_cpu(agf->agf_length) ==
471 be32_to_cpu(agi->agi_length));
472
473 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
474 /*
475 * Free the new space.
476 */
477 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
478 be32_to_cpu(agf->agf_length) - new), new);
479 if (error) {
480 goto error0;
481 }
482 }
483
484 /*
485 * Update changed superblock fields transactionally. These are not
486 * seen by the rest of the world until the transaction commit applies
487 * them atomically to the superblock.
488 */
489 if (nagcount > oagcount)
490 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
491 if (nb > mp->m_sb.sb_dblocks)
492 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
493 nb - mp->m_sb.sb_dblocks);
494 if (nfree)
495 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
496 if (dpct)
497 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
498 error = xfs_trans_commit(tp, 0);
499 if (error)
500 return error;
501
502 /* New allocation groups fully initialized, so update mount struct */
503 if (nagimax)
504 mp->m_maxagi = nagimax;
505 if (mp->m_sb.sb_imax_pct) {
506 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
507 do_div(icount, 100);
508 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
509 } else
510 mp->m_maxicount = 0;
511 xfs_set_low_space_thresholds(mp);
512
513 /* update secondary superblocks. */
514 for (agno = 1; agno < nagcount; agno++) {
515 error = 0;
516 /*
517 * new secondary superblocks need to be zeroed, not read from
518 * disk as the contents of the new area we are growing into is
519 * completely unknown.
520 */
521 if (agno < oagcount) {
522 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
523 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
524 XFS_FSS_TO_BB(mp, 1), 0, &bp,
525 &xfs_sb_buf_ops);
526 } else {
527 bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
528 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
529 XFS_FSS_TO_BB(mp, 1), 0);
530 if (bp) {
531 bp->b_ops = &xfs_sb_buf_ops;
532 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
533 } else
534 error = -ENOMEM;
535 }
536
537 /*
538 * If we get an error reading or writing alternate superblocks,
539 * continue. xfs_repair chooses the "best" superblock based
540 * on most matches; if we break early, we'll leave more
541 * superblocks un-updated than updated, and xfs_repair may
542 * pick them over the properly-updated primary.
543 */
544 if (error) {
545 xfs_warn(mp,
546 "error %d reading secondary superblock for ag %d",
547 error, agno);
548 saved_error = error;
549 continue;
550 }
551 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
552
553 error = xfs_bwrite(bp);
554 xfs_buf_relse(bp);
555 if (error) {
556 xfs_warn(mp,
557 "write error %d updating secondary superblock for ag %d",
558 error, agno);
559 saved_error = error;
560 continue;
561 }
562 }
563 return saved_error ? saved_error : error;
564
565 error0:
566 xfs_trans_cancel(tp, XFS_TRANS_ABORT);
567 return error;
568 }
569
570 static int
571 xfs_growfs_log_private(
572 xfs_mount_t *mp, /* mount point for filesystem */
573 xfs_growfs_log_t *in) /* growfs log input struct */
574 {
575 xfs_extlen_t nb;
576
577 nb = in->newblocks;
578 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
579 return -EINVAL;
580 if (nb == mp->m_sb.sb_logblocks &&
581 in->isint == (mp->m_sb.sb_logstart != 0))
582 return -EINVAL;
583 /*
584 * Moving the log is hard, need new interfaces to sync
585 * the log first, hold off all activity while moving it.
586 * Can have shorter or longer log in the same space,
587 * or transform internal to external log or vice versa.
588 */
589 return -ENOSYS;
590 }
591
592 /*
593 * protected versions of growfs function acquire and release locks on the mount
594 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
595 * XFS_IOC_FSGROWFSRT
596 */
597
598
599 int
600 xfs_growfs_data(
601 xfs_mount_t *mp,
602 xfs_growfs_data_t *in)
603 {
604 int error;
605
606 if (!capable(CAP_SYS_ADMIN))
607 return -EPERM;
608 if (!mutex_trylock(&mp->m_growlock))
609 return -EWOULDBLOCK;
610 error = xfs_growfs_data_private(mp, in);
611 mutex_unlock(&mp->m_growlock);
612 return error;
613 }
614
615 int
616 xfs_growfs_log(
617 xfs_mount_t *mp,
618 xfs_growfs_log_t *in)
619 {
620 int error;
621
622 if (!capable(CAP_SYS_ADMIN))
623 return -EPERM;
624 if (!mutex_trylock(&mp->m_growlock))
625 return -EWOULDBLOCK;
626 error = xfs_growfs_log_private(mp, in);
627 mutex_unlock(&mp->m_growlock);
628 return error;
629 }
630
631 /*
632 * exported through ioctl XFS_IOC_FSCOUNTS
633 */
634
635 int
636 xfs_fs_counts(
637 xfs_mount_t *mp,
638 xfs_fsop_counts_t *cnt)
639 {
640 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
641 spin_lock(&mp->m_sb_lock);
642 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
643 cnt->freertx = mp->m_sb.sb_frextents;
644 cnt->freeino = mp->m_sb.sb_ifree;
645 cnt->allocino = mp->m_sb.sb_icount;
646 spin_unlock(&mp->m_sb_lock);
647 return 0;
648 }
649
650 /*
651 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
652 *
653 * xfs_reserve_blocks is called to set m_resblks
654 * in the in-core mount table. The number of unused reserved blocks
655 * is kept in m_resblks_avail.
656 *
657 * Reserve the requested number of blocks if available. Otherwise return
658 * as many as possible to satisfy the request. The actual number
659 * reserved are returned in outval
660 *
661 * A null inval pointer indicates that only the current reserved blocks
662 * available should be returned no settings are changed.
663 */
664
665 int
666 xfs_reserve_blocks(
667 xfs_mount_t *mp,
668 __uint64_t *inval,
669 xfs_fsop_resblks_t *outval)
670 {
671 __int64_t lcounter, delta, fdblks_delta;
672 __uint64_t request;
673
674 /* If inval is null, report current values and return */
675 if (inval == (__uint64_t *)NULL) {
676 if (!outval)
677 return -EINVAL;
678 outval->resblks = mp->m_resblks;
679 outval->resblks_avail = mp->m_resblks_avail;
680 return 0;
681 }
682
683 request = *inval;
684
685 /*
686 * With per-cpu counters, this becomes an interesting
687 * problem. we needto work out if we are freeing or allocation
688 * blocks first, then we can do the modification as necessary.
689 *
690 * We do this under the m_sb_lock so that if we are near
691 * ENOSPC, we will hold out any changes while we work out
692 * what to do. This means that the amount of free space can
693 * change while we do this, so we need to retry if we end up
694 * trying to reserve more space than is available.
695 *
696 * We also use the xfs_mod_incore_sb() interface so that we
697 * don't have to care about whether per cpu counter are
698 * enabled, disabled or even compiled in....
699 */
700 retry:
701 spin_lock(&mp->m_sb_lock);
702 xfs_icsb_sync_counters_locked(mp, 0);
703
704 /*
705 * If our previous reservation was larger than the current value,
706 * then move any unused blocks back to the free pool.
707 */
708 fdblks_delta = 0;
709 if (mp->m_resblks > request) {
710 lcounter = mp->m_resblks_avail - request;
711 if (lcounter > 0) { /* release unused blocks */
712 fdblks_delta = lcounter;
713 mp->m_resblks_avail -= lcounter;
714 }
715 mp->m_resblks = request;
716 } else {
717 __int64_t free;
718
719 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
720 if (!free)
721 goto out; /* ENOSPC and fdblks_delta = 0 */
722
723 delta = request - mp->m_resblks;
724 lcounter = free - delta;
725 if (lcounter < 0) {
726 /* We can't satisfy the request, just get what we can */
727 mp->m_resblks += free;
728 mp->m_resblks_avail += free;
729 fdblks_delta = -free;
730 } else {
731 fdblks_delta = -delta;
732 mp->m_resblks = request;
733 mp->m_resblks_avail += delta;
734 }
735 }
736 out:
737 if (outval) {
738 outval->resblks = mp->m_resblks;
739 outval->resblks_avail = mp->m_resblks_avail;
740 }
741 spin_unlock(&mp->m_sb_lock);
742
743 if (fdblks_delta) {
744 /*
745 * If we are putting blocks back here, m_resblks_avail is
746 * already at its max so this will put it in the free pool.
747 *
748 * If we need space, we'll either succeed in getting it
749 * from the free block count or we'll get an enospc. If
750 * we get a ENOSPC, it means things changed while we were
751 * calculating fdblks_delta and so we should try again to
752 * see if there is anything left to reserve.
753 *
754 * Don't set the reserved flag here - we don't want to reserve
755 * the extra reserve blocks from the reserve.....
756 */
757 int error;
758 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
759 fdblks_delta, 0);
760 if (error == -ENOSPC)
761 goto retry;
762 }
763 return 0;
764 }
765
766 /*
767 * Dump a transaction into the log that contains no real change. This is needed
768 * to be able to make the log dirty or stamp the current tail LSN into the log
769 * during the covering operation.
770 *
771 * We cannot use an inode here for this - that will push dirty state back up
772 * into the VFS and then periodic inode flushing will prevent log covering from
773 * making progress. Hence we log a field in the superblock instead and use a
774 * synchronous transaction to ensure the superblock is immediately unpinned
775 * and can be written back.
776 */
777 int
778 xfs_fs_log_dummy(
779 xfs_mount_t *mp)
780 {
781 xfs_trans_t *tp;
782 int error;
783
784 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
785 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_sb, 0, 0);
786 if (error) {
787 xfs_trans_cancel(tp, 0);
788 return error;
789 }
790
791 /* log the UUID because it is an unchanging field */
792 xfs_mod_sb(tp, XFS_SB_UUID);
793 xfs_trans_set_sync(tp);
794 return xfs_trans_commit(tp, 0);
795 }
796
797 int
798 xfs_fs_goingdown(
799 xfs_mount_t *mp,
800 __uint32_t inflags)
801 {
802 switch (inflags) {
803 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
804 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
805
806 if (sb && !IS_ERR(sb)) {
807 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
808 thaw_bdev(sb->s_bdev, sb);
809 }
810
811 break;
812 }
813 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
814 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
815 break;
816 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
817 xfs_force_shutdown(mp,
818 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
819 break;
820 default:
821 return -EINVAL;
822 }
823
824 return 0;
825 }
826
827 /*
828 * Force a shutdown of the filesystem instantly while keeping the filesystem
829 * consistent. We don't do an unmount here; just shutdown the shop, make sure
830 * that absolutely nothing persistent happens to this filesystem after this
831 * point.
832 */
833 void
834 xfs_do_force_shutdown(
835 xfs_mount_t *mp,
836 int flags,
837 char *fname,
838 int lnnum)
839 {
840 int logerror;
841
842 logerror = flags & SHUTDOWN_LOG_IO_ERROR;
843
844 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
845 xfs_notice(mp,
846 "%s(0x%x) called from line %d of file %s. Return address = 0x%p",
847 __func__, flags, lnnum, fname, __return_address);
848 }
849 /*
850 * No need to duplicate efforts.
851 */
852 if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
853 return;
854
855 /*
856 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
857 * queue up anybody new on the log reservations, and wakes up
858 * everybody who's sleeping on log reservations to tell them
859 * the bad news.
860 */
861 if (xfs_log_force_umount(mp, logerror))
862 return;
863
864 if (flags & SHUTDOWN_CORRUPT_INCORE) {
865 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
866 "Corruption of in-memory data detected. Shutting down filesystem");
867 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
868 xfs_stack_trace();
869 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
870 if (logerror) {
871 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
872 "Log I/O Error Detected. Shutting down filesystem");
873 } else if (flags & SHUTDOWN_DEVICE_REQ) {
874 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
875 "All device paths lost. Shutting down filesystem");
876 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
877 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
878 "I/O Error Detected. Shutting down filesystem");
879 }
880 }
881 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
882 xfs_alert(mp,
883 "Please umount the filesystem and rectify the problem(s)");
884 }
885 }
Linux kernel - Deliverables
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