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xfs: implement pNFS export operations
[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 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
106 mp->m_sb.sb_logsectsize : BBSIZE;
107 geo->rtsectsize = mp->m_sb.sb_blocksize;
108 geo->dirblocksize = mp->m_dir_geo->blksize;
109 }
110 if (new_version >= 4) {
111 geo->flags |=
112 (xfs_sb_version_haslogv2(&mp->m_sb) ?
113 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
114 geo->logsunit = mp->m_sb.sb_logsunit;
115 }
116 return 0;
117 }
118
119 static struct xfs_buf *
120 xfs_growfs_get_hdr_buf(
121 struct xfs_mount *mp,
122 xfs_daddr_t blkno,
123 size_t numblks,
124 int flags,
125 const struct xfs_buf_ops *ops)
126 {
127 struct xfs_buf *bp;
128
129 bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
130 if (!bp)
131 return NULL;
132
133 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
134 bp->b_bn = blkno;
135 bp->b_maps[0].bm_bn = blkno;
136 bp->b_ops = ops;
137
138 return bp;
139 }
140
141 static int
142 xfs_growfs_data_private(
143 xfs_mount_t *mp, /* mount point for filesystem */
144 xfs_growfs_data_t *in) /* growfs data input struct */
145 {
146 xfs_agf_t *agf;
147 struct xfs_agfl *agfl;
148 xfs_agi_t *agi;
149 xfs_agnumber_t agno;
150 xfs_extlen_t agsize;
151 xfs_extlen_t tmpsize;
152 xfs_alloc_rec_t *arec;
153 xfs_buf_t *bp;
154 int bucket;
155 int dpct;
156 int error, saved_error = 0;
157 xfs_agnumber_t nagcount;
158 xfs_agnumber_t nagimax = 0;
159 xfs_rfsblock_t nb, nb_mod;
160 xfs_rfsblock_t new;
161 xfs_rfsblock_t nfree;
162 xfs_agnumber_t oagcount;
163 int pct;
164 xfs_trans_t *tp;
165
166 nb = in->newblocks;
167 pct = in->imaxpct;
168 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
169 return -EINVAL;
170 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
171 return error;
172 dpct = pct - mp->m_sb.sb_imax_pct;
173 error = xfs_buf_read_uncached(mp->m_ddev_targp,
174 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
175 XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);
176 if (error)
177 return error;
178 xfs_buf_relse(bp);
179
180 new = nb; /* use new as a temporary here */
181 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
182 nagcount = new + (nb_mod != 0);
183 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
184 nagcount--;
185 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
186 if (nb < mp->m_sb.sb_dblocks)
187 return -EINVAL;
188 }
189 new = nb - mp->m_sb.sb_dblocks;
190 oagcount = mp->m_sb.sb_agcount;
191
192 /* allocate the new per-ag structures */
193 if (nagcount > oagcount) {
194 error = xfs_initialize_perag(mp, nagcount, &nagimax);
195 if (error)
196 return error;
197 }
198
199 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
200 tp->t_flags |= XFS_TRANS_RESERVE;
201 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growdata,
202 XFS_GROWFS_SPACE_RES(mp), 0);
203 if (error) {
204 xfs_trans_cancel(tp, 0);
205 return error;
206 }
207
208 /*
209 * Write new AG headers to disk. Non-transactional, but written
210 * synchronously so they are completed prior to the growfs transaction
211 * being logged.
212 */
213 nfree = 0;
214 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
215 __be32 *agfl_bno;
216
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
277 agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
278 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
279 agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
280
281 error = xfs_bwrite(bp);
282 xfs_buf_relse(bp);
283 if (error)
284 goto error0;
285
286 /*
287 * AG inode header block
288 */
289 bp = xfs_growfs_get_hdr_buf(mp,
290 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
291 XFS_FSS_TO_BB(mp, 1), 0,
292 &xfs_agi_buf_ops);
293 if (!bp) {
294 error = -ENOMEM;
295 goto error0;
296 }
297
298 agi = XFS_BUF_TO_AGI(bp);
299 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
300 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
301 agi->agi_seqno = cpu_to_be32(agno);
302 agi->agi_length = cpu_to_be32(agsize);
303 agi->agi_count = 0;
304 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
305 agi->agi_level = cpu_to_be32(1);
306 agi->agi_freecount = 0;
307 agi->agi_newino = cpu_to_be32(NULLAGINO);
308 agi->agi_dirino = cpu_to_be32(NULLAGINO);
309 if (xfs_sb_version_hascrc(&mp->m_sb))
310 uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_uuid);
311 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
312 agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp));
313 agi->agi_free_level = cpu_to_be32(1);
314 }
315 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
316 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
317
318 error = xfs_bwrite(bp);
319 xfs_buf_relse(bp);
320 if (error)
321 goto error0;
322
323 /*
324 * BNO btree root block
325 */
326 bp = xfs_growfs_get_hdr_buf(mp,
327 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
328 BTOBB(mp->m_sb.sb_blocksize), 0,
329 &xfs_allocbt_buf_ops);
330
331 if (!bp) {
332 error = -ENOMEM;
333 goto error0;
334 }
335
336 if (xfs_sb_version_hascrc(&mp->m_sb))
337 xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1,
338 agno, XFS_BTREE_CRC_BLOCKS);
339 else
340 xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1,
341 agno, 0);
342
343 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
344 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
345 arec->ar_blockcount = cpu_to_be32(
346 agsize - be32_to_cpu(arec->ar_startblock));
347
348 error = xfs_bwrite(bp);
349 xfs_buf_relse(bp);
350 if (error)
351 goto error0;
352
353 /*
354 * CNT btree root block
355 */
356 bp = xfs_growfs_get_hdr_buf(mp,
357 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
358 BTOBB(mp->m_sb.sb_blocksize), 0,
359 &xfs_allocbt_buf_ops);
360 if (!bp) {
361 error = -ENOMEM;
362 goto error0;
363 }
364
365 if (xfs_sb_version_hascrc(&mp->m_sb))
366 xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1,
367 agno, XFS_BTREE_CRC_BLOCKS);
368 else
369 xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1,
370 agno, 0);
371
372 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
373 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
374 arec->ar_blockcount = cpu_to_be32(
375 agsize - be32_to_cpu(arec->ar_startblock));
376 nfree += be32_to_cpu(arec->ar_blockcount);
377
378 error = xfs_bwrite(bp);
379 xfs_buf_relse(bp);
380 if (error)
381 goto error0;
382
383 /*
384 * INO btree root block
385 */
386 bp = xfs_growfs_get_hdr_buf(mp,
387 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
388 BTOBB(mp->m_sb.sb_blocksize), 0,
389 &xfs_inobt_buf_ops);
390 if (!bp) {
391 error = -ENOMEM;
392 goto error0;
393 }
394
395 if (xfs_sb_version_hascrc(&mp->m_sb))
396 xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0,
397 agno, XFS_BTREE_CRC_BLOCKS);
398 else
399 xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0,
400 agno, 0);
401
402 error = xfs_bwrite(bp);
403 xfs_buf_relse(bp);
404 if (error)
405 goto error0;
406
407 /*
408 * FINO btree root block
409 */
410 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
411 bp = xfs_growfs_get_hdr_buf(mp,
412 XFS_AGB_TO_DADDR(mp, agno, XFS_FIBT_BLOCK(mp)),
413 BTOBB(mp->m_sb.sb_blocksize), 0,
414 &xfs_inobt_buf_ops);
415 if (!bp) {
416 error = -ENOMEM;
417 goto error0;
418 }
419
420 if (xfs_sb_version_hascrc(&mp->m_sb))
421 xfs_btree_init_block(mp, bp, XFS_FIBT_CRC_MAGIC,
422 0, 0, agno,
423 XFS_BTREE_CRC_BLOCKS);
424 else
425 xfs_btree_init_block(mp, bp, XFS_FIBT_MAGIC, 0,
426 0, agno, 0);
427
428 error = xfs_bwrite(bp);
429 xfs_buf_relse(bp);
430 if (error)
431 goto error0;
432 }
433
434 }
435 xfs_trans_agblocks_delta(tp, nfree);
436 /*
437 * There are new blocks in the old last a.g.
438 */
439 if (new) {
440 /*
441 * Change the agi length.
442 */
443 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
444 if (error) {
445 goto error0;
446 }
447 ASSERT(bp);
448 agi = XFS_BUF_TO_AGI(bp);
449 be32_add_cpu(&agi->agi_length, new);
450 ASSERT(nagcount == oagcount ||
451 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
452 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
453 /*
454 * Change agf length.
455 */
456 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
457 if (error) {
458 goto error0;
459 }
460 ASSERT(bp);
461 agf = XFS_BUF_TO_AGF(bp);
462 be32_add_cpu(&agf->agf_length, new);
463 ASSERT(be32_to_cpu(agf->agf_length) ==
464 be32_to_cpu(agi->agi_length));
465
466 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
467 /*
468 * Free the new space.
469 */
470 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
471 be32_to_cpu(agf->agf_length) - new), new);
472 if (error) {
473 goto error0;
474 }
475 }
476
477 /*
478 * Update changed superblock fields transactionally. These are not
479 * seen by the rest of the world until the transaction commit applies
480 * them atomically to the superblock.
481 */
482 if (nagcount > oagcount)
483 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
484 if (nb > mp->m_sb.sb_dblocks)
485 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
486 nb - mp->m_sb.sb_dblocks);
487 if (nfree)
488 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
489 if (dpct)
490 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
491 xfs_trans_set_sync(tp);
492 error = xfs_trans_commit(tp, 0);
493 if (error)
494 return error;
495
496 /* New allocation groups fully initialized, so update mount struct */
497 if (nagimax)
498 mp->m_maxagi = nagimax;
499 if (mp->m_sb.sb_imax_pct) {
500 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
501 do_div(icount, 100);
502 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
503 } else
504 mp->m_maxicount = 0;
505 xfs_set_low_space_thresholds(mp);
506
507 /* update secondary superblocks. */
508 for (agno = 1; agno < nagcount; agno++) {
509 error = 0;
510 /*
511 * new secondary superblocks need to be zeroed, not read from
512 * disk as the contents of the new area we are growing into is
513 * completely unknown.
514 */
515 if (agno < oagcount) {
516 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
517 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
518 XFS_FSS_TO_BB(mp, 1), 0, &bp,
519 &xfs_sb_buf_ops);
520 } else {
521 bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
522 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
523 XFS_FSS_TO_BB(mp, 1), 0);
524 if (bp) {
525 bp->b_ops = &xfs_sb_buf_ops;
526 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
527 } else
528 error = -ENOMEM;
529 }
530
531 /*
532 * If we get an error reading or writing alternate superblocks,
533 * continue. xfs_repair chooses the "best" superblock based
534 * on most matches; if we break early, we'll leave more
535 * superblocks un-updated than updated, and xfs_repair may
536 * pick them over the properly-updated primary.
537 */
538 if (error) {
539 xfs_warn(mp,
540 "error %d reading secondary superblock for ag %d",
541 error, agno);
542 saved_error = error;
543 continue;
544 }
545 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
546
547 error = xfs_bwrite(bp);
548 xfs_buf_relse(bp);
549 if (error) {
550 xfs_warn(mp,
551 "write error %d updating secondary superblock for ag %d",
552 error, agno);
553 saved_error = error;
554 continue;
555 }
556 }
557 return saved_error ? saved_error : error;
558
559 error0:
560 xfs_trans_cancel(tp, XFS_TRANS_ABORT);
561 return error;
562 }
563
564 static int
565 xfs_growfs_log_private(
566 xfs_mount_t *mp, /* mount point for filesystem */
567 xfs_growfs_log_t *in) /* growfs log input struct */
568 {
569 xfs_extlen_t nb;
570
571 nb = in->newblocks;
572 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
573 return -EINVAL;
574 if (nb == mp->m_sb.sb_logblocks &&
575 in->isint == (mp->m_sb.sb_logstart != 0))
576 return -EINVAL;
577 /*
578 * Moving the log is hard, need new interfaces to sync
579 * the log first, hold off all activity while moving it.
580 * Can have shorter or longer log in the same space,
581 * or transform internal to external log or vice versa.
582 */
583 return -ENOSYS;
584 }
585
586 /*
587 * protected versions of growfs function acquire and release locks on the mount
588 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
589 * XFS_IOC_FSGROWFSRT
590 */
591
592
593 int
594 xfs_growfs_data(
595 xfs_mount_t *mp,
596 xfs_growfs_data_t *in)
597 {
598 int error;
599
600 if (!capable(CAP_SYS_ADMIN))
601 return -EPERM;
602 if (!mutex_trylock(&mp->m_growlock))
603 return -EWOULDBLOCK;
604 error = xfs_growfs_data_private(mp, in);
605 /*
606 * Increment the generation unconditionally, the error could be from
607 * updating the secondary superblocks, in which case the new size
608 * is live already.
609 */
610 mp->m_generation++;
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 int
767 xfs_fs_goingdown(
768 xfs_mount_t *mp,
769 __uint32_t inflags)
770 {
771 switch (inflags) {
772 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
773 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
774
775 if (sb && !IS_ERR(sb)) {
776 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
777 thaw_bdev(sb->s_bdev, sb);
778 }
779
780 break;
781 }
782 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
783 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
784 break;
785 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
786 xfs_force_shutdown(mp,
787 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
788 break;
789 default:
790 return -EINVAL;
791 }
792
793 return 0;
794 }
795
796 /*
797 * Force a shutdown of the filesystem instantly while keeping the filesystem
798 * consistent. We don't do an unmount here; just shutdown the shop, make sure
799 * that absolutely nothing persistent happens to this filesystem after this
800 * point.
801 */
802 void
803 xfs_do_force_shutdown(
804 xfs_mount_t *mp,
805 int flags,
806 char *fname,
807 int lnnum)
808 {
809 int logerror;
810
811 logerror = flags & SHUTDOWN_LOG_IO_ERROR;
812
813 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
814 xfs_notice(mp,
815 "%s(0x%x) called from line %d of file %s. Return address = 0x%p",
816 __func__, flags, lnnum, fname, __return_address);
817 }
818 /*
819 * No need to duplicate efforts.
820 */
821 if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
822 return;
823
824 /*
825 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
826 * queue up anybody new on the log reservations, and wakes up
827 * everybody who's sleeping on log reservations to tell them
828 * the bad news.
829 */
830 if (xfs_log_force_umount(mp, logerror))
831 return;
832
833 if (flags & SHUTDOWN_CORRUPT_INCORE) {
834 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
835 "Corruption of in-memory data detected. Shutting down filesystem");
836 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
837 xfs_stack_trace();
838 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
839 if (logerror) {
840 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
841 "Log I/O Error Detected. Shutting down filesystem");
842 } else if (flags & SHUTDOWN_DEVICE_REQ) {
843 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
844 "All device paths lost. Shutting down filesystem");
845 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
846 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
847 "I/O Error Detected. Shutting down filesystem");
848 }
849 }
850 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
851 xfs_alert(mp,
852 "Please umount the filesystem and rectify the problem(s)");
853 }
854 }
Linux kernel - Deliverables
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