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xfs: better xfs_trans_alloc interface
[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_shared.h"
21 #include "xfs_format.h"
22 #include "xfs_log_format.h"
23 #include "xfs_trans_resv.h"
24 #include "xfs_sb.h"
25 #include "xfs_mount.h"
26 #include "xfs_da_format.h"
27 #include "xfs_da_btree.h"
28 #include "xfs_inode.h"
29 #include "xfs_trans.h"
30 #include "xfs_inode_item.h"
31 #include "xfs_error.h"
32 #include "xfs_btree.h"
33 #include "xfs_alloc_btree.h"
34 #include "xfs_alloc.h"
35 #include "xfs_ialloc.h"
36 #include "xfs_fsops.h"
37 #include "xfs_itable.h"
38 #include "xfs_trans_space.h"
39 #include "xfs_rtalloc.h"
40 #include "xfs_trace.h"
41 #include "xfs_log.h"
42 #include "xfs_filestream.h"
43
44 /*
45 * File system operations
46 */
47
48 int
49 xfs_fs_geometry(
50 xfs_mount_t *mp,
51 xfs_fsop_geom_t *geo,
52 int new_version)
53 {
54
55 memset(geo, 0, sizeof(*geo));
56
57 geo->blocksize = mp->m_sb.sb_blocksize;
58 geo->rtextsize = mp->m_sb.sb_rextsize;
59 geo->agblocks = mp->m_sb.sb_agblocks;
60 geo->agcount = mp->m_sb.sb_agcount;
61 geo->logblocks = mp->m_sb.sb_logblocks;
62 geo->sectsize = mp->m_sb.sb_sectsize;
63 geo->inodesize = mp->m_sb.sb_inodesize;
64 geo->imaxpct = mp->m_sb.sb_imax_pct;
65 geo->datablocks = mp->m_sb.sb_dblocks;
66 geo->rtblocks = mp->m_sb.sb_rblocks;
67 geo->rtextents = mp->m_sb.sb_rextents;
68 geo->logstart = mp->m_sb.sb_logstart;
69 ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
70 memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
71 if (new_version >= 2) {
72 geo->sunit = mp->m_sb.sb_unit;
73 geo->swidth = mp->m_sb.sb_width;
74 }
75 if (new_version >= 3) {
76 geo->version = XFS_FSOP_GEOM_VERSION;
77 geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK |
78 XFS_FSOP_GEOM_FLAGS_DIRV2 |
79 (xfs_sb_version_hasattr(&mp->m_sb) ?
80 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
81 (xfs_sb_version_hasquota(&mp->m_sb) ?
82 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
83 (xfs_sb_version_hasalign(&mp->m_sb) ?
84 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
85 (xfs_sb_version_hasdalign(&mp->m_sb) ?
86 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
87 (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
88 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
89 (xfs_sb_version_hassector(&mp->m_sb) ?
90 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
91 (xfs_sb_version_hasasciici(&mp->m_sb) ?
92 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
93 (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
94 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
95 (xfs_sb_version_hasattr2(&mp->m_sb) ?
96 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) |
97 (xfs_sb_version_hasprojid32bit(&mp->m_sb) ?
98 XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) |
99 (xfs_sb_version_hascrc(&mp->m_sb) ?
100 XFS_FSOP_GEOM_FLAGS_V5SB : 0) |
101 (xfs_sb_version_hasftype(&mp->m_sb) ?
102 XFS_FSOP_GEOM_FLAGS_FTYPE : 0) |
103 (xfs_sb_version_hasfinobt(&mp->m_sb) ?
104 XFS_FSOP_GEOM_FLAGS_FINOBT : 0) |
105 (xfs_sb_version_hassparseinodes(&mp->m_sb) ?
106 XFS_FSOP_GEOM_FLAGS_SPINODES : 0);
107 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
108 mp->m_sb.sb_logsectsize : BBSIZE;
109 geo->rtsectsize = mp->m_sb.sb_blocksize;
110 geo->dirblocksize = mp->m_dir_geo->blksize;
111 }
112 if (new_version >= 4) {
113 geo->flags |=
114 (xfs_sb_version_haslogv2(&mp->m_sb) ?
115 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
116 geo->logsunit = mp->m_sb.sb_logsunit;
117 }
118 return 0;
119 }
120
121 static struct xfs_buf *
122 xfs_growfs_get_hdr_buf(
123 struct xfs_mount *mp,
124 xfs_daddr_t blkno,
125 size_t numblks,
126 int flags,
127 const struct xfs_buf_ops *ops)
128 {
129 struct xfs_buf *bp;
130
131 bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
132 if (!bp)
133 return NULL;
134
135 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
136 bp->b_bn = blkno;
137 bp->b_maps[0].bm_bn = blkno;
138 bp->b_ops = ops;
139
140 return bp;
141 }
142
143 static int
144 xfs_growfs_data_private(
145 xfs_mount_t *mp, /* mount point for filesystem */
146 xfs_growfs_data_t *in) /* growfs data input struct */
147 {
148 xfs_agf_t *agf;
149 struct xfs_agfl *agfl;
150 xfs_agi_t *agi;
151 xfs_agnumber_t agno;
152 xfs_extlen_t agsize;
153 xfs_extlen_t tmpsize;
154 xfs_alloc_rec_t *arec;
155 xfs_buf_t *bp;
156 int bucket;
157 int dpct;
158 int error, saved_error = 0;
159 xfs_agnumber_t nagcount;
160 xfs_agnumber_t nagimax = 0;
161 xfs_rfsblock_t nb, nb_mod;
162 xfs_rfsblock_t new;
163 xfs_rfsblock_t nfree;
164 xfs_agnumber_t oagcount;
165 int pct;
166 xfs_trans_t *tp;
167
168 nb = in->newblocks;
169 pct = in->imaxpct;
170 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
171 return -EINVAL;
172 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
173 return error;
174 dpct = pct - mp->m_sb.sb_imax_pct;
175 error = xfs_buf_read_uncached(mp->m_ddev_targp,
176 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
177 XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);
178 if (error)
179 return error;
180 xfs_buf_relse(bp);
181
182 new = nb; /* use new as a temporary here */
183 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
184 nagcount = new + (nb_mod != 0);
185 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
186 nagcount--;
187 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
188 if (nb < mp->m_sb.sb_dblocks)
189 return -EINVAL;
190 }
191 new = nb - mp->m_sb.sb_dblocks;
192 oagcount = mp->m_sb.sb_agcount;
193
194 /* allocate the new per-ag structures */
195 if (nagcount > oagcount) {
196 error = xfs_initialize_perag(mp, nagcount, &nagimax);
197 if (error)
198 return error;
199 }
200
201 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
202 XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp);
203 if (error)
204 return error;
205
206 /*
207 * Write new AG headers to disk. Non-transactional, but written
208 * synchronously so they are completed prior to the growfs transaction
209 * being logged.
210 */
211 nfree = 0;
212 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
213 __be32 *agfl_bno;
214
215 /*
216 * AG freespace header block
217 */
218 bp = xfs_growfs_get_hdr_buf(mp,
219 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
220 XFS_FSS_TO_BB(mp, 1), 0,
221 &xfs_agf_buf_ops);
222 if (!bp) {
223 error = -ENOMEM;
224 goto error0;
225 }
226
227 agf = XFS_BUF_TO_AGF(bp);
228 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
229 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
230 agf->agf_seqno = cpu_to_be32(agno);
231 if (agno == nagcount - 1)
232 agsize =
233 nb -
234 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
235 else
236 agsize = mp->m_sb.sb_agblocks;
237 agf->agf_length = cpu_to_be32(agsize);
238 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
239 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
240 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
241 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
242 agf->agf_flfirst = 0;
243 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
244 agf->agf_flcount = 0;
245 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
246 agf->agf_freeblks = cpu_to_be32(tmpsize);
247 agf->agf_longest = cpu_to_be32(tmpsize);
248 if (xfs_sb_version_hascrc(&mp->m_sb))
249 uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid);
250
251 error = xfs_bwrite(bp);
252 xfs_buf_relse(bp);
253 if (error)
254 goto error0;
255
256 /*
257 * AG freelist header block
258 */
259 bp = xfs_growfs_get_hdr_buf(mp,
260 XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)),
261 XFS_FSS_TO_BB(mp, 1), 0,
262 &xfs_agfl_buf_ops);
263 if (!bp) {
264 error = -ENOMEM;
265 goto error0;
266 }
267
268 agfl = XFS_BUF_TO_AGFL(bp);
269 if (xfs_sb_version_hascrc(&mp->m_sb)) {
270 agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
271 agfl->agfl_seqno = cpu_to_be32(agno);
272 uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid);
273 }
274
275 agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
276 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
277 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_meta_uuid);
309 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
310 agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp));
311 agi->agi_free_level = cpu_to_be32(1);
312 }
313 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
314 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
315
316 error = xfs_bwrite(bp);
317 xfs_buf_relse(bp);
318 if (error)
319 goto error0;
320
321 /*
322 * BNO btree root block
323 */
324 bp = xfs_growfs_get_hdr_buf(mp,
325 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
326 BTOBB(mp->m_sb.sb_blocksize), 0,
327 &xfs_allocbt_buf_ops);
328
329 if (!bp) {
330 error = -ENOMEM;
331 goto error0;
332 }
333
334 if (xfs_sb_version_hascrc(&mp->m_sb))
335 xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1,
336 agno, XFS_BTREE_CRC_BLOCKS);
337 else
338 xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1,
339 agno, 0);
340
341 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
342 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
343 arec->ar_blockcount = cpu_to_be32(
344 agsize - be32_to_cpu(arec->ar_startblock));
345
346 error = xfs_bwrite(bp);
347 xfs_buf_relse(bp);
348 if (error)
349 goto error0;
350
351 /*
352 * CNT btree root block
353 */
354 bp = xfs_growfs_get_hdr_buf(mp,
355 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
356 BTOBB(mp->m_sb.sb_blocksize), 0,
357 &xfs_allocbt_buf_ops);
358 if (!bp) {
359 error = -ENOMEM;
360 goto error0;
361 }
362
363 if (xfs_sb_version_hascrc(&mp->m_sb))
364 xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1,
365 agno, XFS_BTREE_CRC_BLOCKS);
366 else
367 xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1,
368 agno, 0);
369
370 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
371 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
372 arec->ar_blockcount = cpu_to_be32(
373 agsize - be32_to_cpu(arec->ar_startblock));
374 nfree += be32_to_cpu(arec->ar_blockcount);
375
376 error = xfs_bwrite(bp);
377 xfs_buf_relse(bp);
378 if (error)
379 goto error0;
380
381 /*
382 * INO btree root block
383 */
384 bp = xfs_growfs_get_hdr_buf(mp,
385 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
386 BTOBB(mp->m_sb.sb_blocksize), 0,
387 &xfs_inobt_buf_ops);
388 if (!bp) {
389 error = -ENOMEM;
390 goto error0;
391 }
392
393 if (xfs_sb_version_hascrc(&mp->m_sb))
394 xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0,
395 agno, XFS_BTREE_CRC_BLOCKS);
396 else
397 xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0,
398 agno, 0);
399
400 error = xfs_bwrite(bp);
401 xfs_buf_relse(bp);
402 if (error)
403 goto error0;
404
405 /*
406 * FINO btree root block
407 */
408 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
409 bp = xfs_growfs_get_hdr_buf(mp,
410 XFS_AGB_TO_DADDR(mp, agno, XFS_FIBT_BLOCK(mp)),
411 BTOBB(mp->m_sb.sb_blocksize), 0,
412 &xfs_inobt_buf_ops);
413 if (!bp) {
414 error = -ENOMEM;
415 goto error0;
416 }
417
418 if (xfs_sb_version_hascrc(&mp->m_sb))
419 xfs_btree_init_block(mp, bp, XFS_FIBT_CRC_MAGIC,
420 0, 0, agno,
421 XFS_BTREE_CRC_BLOCKS);
422 else
423 xfs_btree_init_block(mp, bp, XFS_FIBT_MAGIC, 0,
424 0, agno, 0);
425
426 error = xfs_bwrite(bp);
427 xfs_buf_relse(bp);
428 if (error)
429 goto error0;
430 }
431
432 }
433 xfs_trans_agblocks_delta(tp, nfree);
434 /*
435 * There are new blocks in the old last a.g.
436 */
437 if (new) {
438 /*
439 * Change the agi length.
440 */
441 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
442 if (error) {
443 goto error0;
444 }
445 ASSERT(bp);
446 agi = XFS_BUF_TO_AGI(bp);
447 be32_add_cpu(&agi->agi_length, new);
448 ASSERT(nagcount == oagcount ||
449 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
450 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
451 /*
452 * Change agf length.
453 */
454 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
455 if (error) {
456 goto error0;
457 }
458 ASSERT(bp);
459 agf = XFS_BUF_TO_AGF(bp);
460 be32_add_cpu(&agf->agf_length, new);
461 ASSERT(be32_to_cpu(agf->agf_length) ==
462 be32_to_cpu(agi->agi_length));
463
464 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
465 /*
466 * Free the new space.
467 */
468 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
469 be32_to_cpu(agf->agf_length) - new), new);
470 if (error) {
471 goto error0;
472 }
473 }
474
475 /*
476 * Update changed superblock fields transactionally. These are not
477 * seen by the rest of the world until the transaction commit applies
478 * them atomically to the superblock.
479 */
480 if (nagcount > oagcount)
481 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
482 if (nb > mp->m_sb.sb_dblocks)
483 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
484 nb - mp->m_sb.sb_dblocks);
485 if (nfree)
486 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
487 if (dpct)
488 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
489 xfs_trans_set_sync(tp);
490 error = xfs_trans_commit(tp);
491 if (error)
492 return error;
493
494 /* New allocation groups fully initialized, so update mount struct */
495 if (nagimax)
496 mp->m_maxagi = nagimax;
497 if (mp->m_sb.sb_imax_pct) {
498 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
499 do_div(icount, 100);
500 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
501 } else
502 mp->m_maxicount = 0;
503 xfs_set_low_space_thresholds(mp);
504
505 /* update secondary superblocks. */
506 for (agno = 1; agno < nagcount; agno++) {
507 error = 0;
508 /*
509 * new secondary superblocks need to be zeroed, not read from
510 * disk as the contents of the new area we are growing into is
511 * completely unknown.
512 */
513 if (agno < oagcount) {
514 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
515 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
516 XFS_FSS_TO_BB(mp, 1), 0, &bp,
517 &xfs_sb_buf_ops);
518 } else {
519 bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
520 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
521 XFS_FSS_TO_BB(mp, 1), 0);
522 if (bp) {
523 bp->b_ops = &xfs_sb_buf_ops;
524 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
525 } else
526 error = -ENOMEM;
527 }
528
529 /*
530 * If we get an error reading or writing alternate superblocks,
531 * continue. xfs_repair chooses the "best" superblock based
532 * on most matches; if we break early, we'll leave more
533 * superblocks un-updated than updated, and xfs_repair may
534 * pick them over the properly-updated primary.
535 */
536 if (error) {
537 xfs_warn(mp,
538 "error %d reading secondary superblock for ag %d",
539 error, agno);
540 saved_error = error;
541 continue;
542 }
543 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
544
545 error = xfs_bwrite(bp);
546 xfs_buf_relse(bp);
547 if (error) {
548 xfs_warn(mp,
549 "write error %d updating secondary superblock for ag %d",
550 error, agno);
551 saved_error = error;
552 continue;
553 }
554 }
555 return saved_error ? saved_error : error;
556
557 error0:
558 xfs_trans_cancel(tp);
559 return error;
560 }
561
562 static int
563 xfs_growfs_log_private(
564 xfs_mount_t *mp, /* mount point for filesystem */
565 xfs_growfs_log_t *in) /* growfs log input struct */
566 {
567 xfs_extlen_t nb;
568
569 nb = in->newblocks;
570 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
571 return -EINVAL;
572 if (nb == mp->m_sb.sb_logblocks &&
573 in->isint == (mp->m_sb.sb_logstart != 0))
574 return -EINVAL;
575 /*
576 * Moving the log is hard, need new interfaces to sync
577 * the log first, hold off all activity while moving it.
578 * Can have shorter or longer log in the same space,
579 * or transform internal to external log or vice versa.
580 */
581 return -ENOSYS;
582 }
583
584 /*
585 * protected versions of growfs function acquire and release locks on the mount
586 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
587 * XFS_IOC_FSGROWFSRT
588 */
589
590
591 int
592 xfs_growfs_data(
593 xfs_mount_t *mp,
594 xfs_growfs_data_t *in)
595 {
596 int error;
597
598 if (!capable(CAP_SYS_ADMIN))
599 return -EPERM;
600 if (!mutex_trylock(&mp->m_growlock))
601 return -EWOULDBLOCK;
602 error = xfs_growfs_data_private(mp, in);
603 /*
604 * Increment the generation unconditionally, the error could be from
605 * updating the secondary superblocks, in which case the new size
606 * is live already.
607 */
608 mp->m_generation++;
609 mutex_unlock(&mp->m_growlock);
610 return error;
611 }
612
613 int
614 xfs_growfs_log(
615 xfs_mount_t *mp,
616 xfs_growfs_log_t *in)
617 {
618 int error;
619
620 if (!capable(CAP_SYS_ADMIN))
621 return -EPERM;
622 if (!mutex_trylock(&mp->m_growlock))
623 return -EWOULDBLOCK;
624 error = xfs_growfs_log_private(mp, in);
625 mutex_unlock(&mp->m_growlock);
626 return error;
627 }
628
629 /*
630 * exported through ioctl XFS_IOC_FSCOUNTS
631 */
632
633 int
634 xfs_fs_counts(
635 xfs_mount_t *mp,
636 xfs_fsop_counts_t *cnt)
637 {
638 cnt->allocino = percpu_counter_read_positive(&mp->m_icount);
639 cnt->freeino = percpu_counter_read_positive(&mp->m_ifree);
640 cnt->freedata = percpu_counter_read_positive(&mp->m_fdblocks) -
641 XFS_ALLOC_SET_ASIDE(mp);
642
643 spin_lock(&mp->m_sb_lock);
644 cnt->freertx = mp->m_sb.sb_frextents;
645 spin_unlock(&mp->m_sb_lock);
646 return 0;
647 }
648
649 /*
650 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
651 *
652 * xfs_reserve_blocks is called to set m_resblks
653 * in the in-core mount table. The number of unused reserved blocks
654 * is kept in m_resblks_avail.
655 *
656 * Reserve the requested number of blocks if available. Otherwise return
657 * as many as possible to satisfy the request. The actual number
658 * reserved are returned in outval
659 *
660 * A null inval pointer indicates that only the current reserved blocks
661 * available should be returned no settings are changed.
662 */
663
664 int
665 xfs_reserve_blocks(
666 xfs_mount_t *mp,
667 __uint64_t *inval,
668 xfs_fsop_resblks_t *outval)
669 {
670 __int64_t lcounter, delta, fdblks_delta;
671 __uint64_t request;
672
673 /* If inval is null, report current values and return */
674 if (inval == (__uint64_t *)NULL) {
675 if (!outval)
676 return -EINVAL;
677 outval->resblks = mp->m_resblks;
678 outval->resblks_avail = mp->m_resblks_avail;
679 return 0;
680 }
681
682 request = *inval;
683
684 /*
685 * With per-cpu counters, this becomes an interesting
686 * problem. we needto work out if we are freeing or allocation
687 * blocks first, then we can do the modification as necessary.
688 *
689 * We do this under the m_sb_lock so that if we are near
690 * ENOSPC, we will hold out any changes while we work out
691 * what to do. This means that the amount of free space can
692 * change while we do this, so we need to retry if we end up
693 * trying to reserve more space than is available.
694 */
695 retry:
696 spin_lock(&mp->m_sb_lock);
697
698 /*
699 * If our previous reservation was larger than the current value,
700 * then move any unused blocks back to the free pool.
701 */
702 fdblks_delta = 0;
703 if (mp->m_resblks > request) {
704 lcounter = mp->m_resblks_avail - request;
705 if (lcounter > 0) { /* release unused blocks */
706 fdblks_delta = lcounter;
707 mp->m_resblks_avail -= lcounter;
708 }
709 mp->m_resblks = request;
710 } else {
711 __int64_t free;
712
713 free = percpu_counter_sum(&mp->m_fdblocks) -
714 XFS_ALLOC_SET_ASIDE(mp);
715 if (!free)
716 goto out; /* ENOSPC and fdblks_delta = 0 */
717
718 delta = request - mp->m_resblks;
719 lcounter = free - delta;
720 if (lcounter < 0) {
721 /* We can't satisfy the request, just get what we can */
722 mp->m_resblks += free;
723 mp->m_resblks_avail += free;
724 fdblks_delta = -free;
725 } else {
726 fdblks_delta = -delta;
727 mp->m_resblks = request;
728 mp->m_resblks_avail += delta;
729 }
730 }
731 out:
732 if (outval) {
733 outval->resblks = mp->m_resblks;
734 outval->resblks_avail = mp->m_resblks_avail;
735 }
736 spin_unlock(&mp->m_sb_lock);
737
738 if (fdblks_delta) {
739 /*
740 * If we are putting blocks back here, m_resblks_avail is
741 * already at its max so this will put it in the free pool.
742 *
743 * If we need space, we'll either succeed in getting it
744 * from the free block count or we'll get an enospc. If
745 * we get a ENOSPC, it means things changed while we were
746 * calculating fdblks_delta and so we should try again to
747 * see if there is anything left to reserve.
748 *
749 * Don't set the reserved flag here - we don't want to reserve
750 * the extra reserve blocks from the reserve.....
751 */
752 int error;
753 error = xfs_mod_fdblocks(mp, fdblks_delta, 0);
754 if (error == -ENOSPC)
755 goto retry;
756 }
757 return 0;
758 }
759
760 int
761 xfs_fs_goingdown(
762 xfs_mount_t *mp,
763 __uint32_t inflags)
764 {
765 switch (inflags) {
766 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
767 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
768
769 if (sb && !IS_ERR(sb)) {
770 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
771 thaw_bdev(sb->s_bdev, sb);
772 }
773
774 break;
775 }
776 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
777 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
778 break;
779 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
780 xfs_force_shutdown(mp,
781 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
782 break;
783 default:
784 return -EINVAL;
785 }
786
787 return 0;
788 }
789
790 /*
791 * Force a shutdown of the filesystem instantly while keeping the filesystem
792 * consistent. We don't do an unmount here; just shutdown the shop, make sure
793 * that absolutely nothing persistent happens to this filesystem after this
794 * point.
795 */
796 void
797 xfs_do_force_shutdown(
798 xfs_mount_t *mp,
799 int flags,
800 char *fname,
801 int lnnum)
802 {
803 int logerror;
804
805 logerror = flags & SHUTDOWN_LOG_IO_ERROR;
806
807 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
808 xfs_notice(mp,
809 "%s(0x%x) called from line %d of file %s. Return address = 0x%p",
810 __func__, flags, lnnum, fname, __return_address);
811 }
812 /*
813 * No need to duplicate efforts.
814 */
815 if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
816 return;
817
818 /*
819 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
820 * queue up anybody new on the log reservations, and wakes up
821 * everybody who's sleeping on log reservations to tell them
822 * the bad news.
823 */
824 if (xfs_log_force_umount(mp, logerror))
825 return;
826
827 if (flags & SHUTDOWN_CORRUPT_INCORE) {
828 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
829 "Corruption of in-memory data detected. Shutting down filesystem");
830 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
831 xfs_stack_trace();
832 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
833 if (logerror) {
834 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
835 "Log I/O Error Detected. Shutting down filesystem");
836 } else if (flags & SHUTDOWN_DEVICE_REQ) {
837 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
838 "All device paths lost. Shutting down filesystem");
839 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
840 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
841 "I/O Error Detected. Shutting down filesystem");
842 }
843 }
844 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
845 xfs_alert(mp,
846 "Please umount the filesystem and rectify the problem(s)");
847 }
848 }
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