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xfs: rmap btree add more reserved blocks
[deliverable/linux.git] / fs / xfs / xfs_fsops.c
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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_defer.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_filestream.h"
44
45/*
46 * File system operations
47 */
48
49int
50xfs_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 = XFS_FSOP_GEOM_FLAGS_NLINK |
79 XFS_FSOP_GEOM_FLAGS_DIRV2 |
80 (xfs_sb_version_hasattr(&mp->m_sb) ?
81 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
82 (xfs_sb_version_hasquota(&mp->m_sb) ?
83 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
84 (xfs_sb_version_hasalign(&mp->m_sb) ?
85 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
86 (xfs_sb_version_hasdalign(&mp->m_sb) ?
87 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
88 (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
89 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
90 (xfs_sb_version_hassector(&mp->m_sb) ?
91 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
92 (xfs_sb_version_hasasciici(&mp->m_sb) ?
93 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
94 (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
95 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
96 (xfs_sb_version_hasattr2(&mp->m_sb) ?
97 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) |
98 (xfs_sb_version_hasprojid32bit(&mp->m_sb) ?
99 XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) |
100 (xfs_sb_version_hascrc(&mp->m_sb) ?
101 XFS_FSOP_GEOM_FLAGS_V5SB : 0) |
102 (xfs_sb_version_hasftype(&mp->m_sb) ?
103 XFS_FSOP_GEOM_FLAGS_FTYPE : 0) |
104 (xfs_sb_version_hasfinobt(&mp->m_sb) ?
105 XFS_FSOP_GEOM_FLAGS_FINOBT : 0) |
106 (xfs_sb_version_hassparseinodes(&mp->m_sb) ?
107 XFS_FSOP_GEOM_FLAGS_SPINODES : 0);
108 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
109 mp->m_sb.sb_logsectsize : BBSIZE;
110 geo->rtsectsize = mp->m_sb.sb_blocksize;
111 geo->dirblocksize = mp->m_dir_geo->blksize;
112 }
113 if (new_version >= 4) {
114 geo->flags |=
115 (xfs_sb_version_haslogv2(&mp->m_sb) ?
116 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
117 geo->logsunit = mp->m_sb.sb_logsunit;
118 }
119 return 0;
120}
121
122static struct xfs_buf *
123xfs_growfs_get_hdr_buf(
124 struct xfs_mount *mp,
125 xfs_daddr_t blkno,
126 size_t numblks,
127 int flags,
128 const struct xfs_buf_ops *ops)
129{
130 struct xfs_buf *bp;
131
132 bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
133 if (!bp)
134 return NULL;
135
136 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
137 bp->b_bn = blkno;
138 bp->b_maps[0].bm_bn = blkno;
139 bp->b_ops = ops;
140
141 return bp;
142}
143
144static int
145xfs_growfs_data_private(
146 xfs_mount_t *mp, /* mount point for filesystem */
147 xfs_growfs_data_t *in) /* growfs data input struct */
148{
149 xfs_agf_t *agf;
150 struct xfs_agfl *agfl;
151 xfs_agi_t *agi;
152 xfs_agnumber_t agno;
153 xfs_extlen_t agsize;
154 xfs_extlen_t tmpsize;
155 xfs_alloc_rec_t *arec;
156 xfs_buf_t *bp;
157 int bucket;
158 int dpct;
159 int error, saved_error = 0;
160 xfs_agnumber_t nagcount;
161 xfs_agnumber_t nagimax = 0;
162 xfs_rfsblock_t nb, nb_mod;
163 xfs_rfsblock_t new;
164 xfs_rfsblock_t nfree;
165 xfs_agnumber_t oagcount;
166 int pct;
167 xfs_trans_t *tp;
168
169 nb = in->newblocks;
170 pct = in->imaxpct;
171 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
172 return -EINVAL;
173 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
174 return error;
175 dpct = pct - mp->m_sb.sb_imax_pct;
176 error = xfs_buf_read_uncached(mp->m_ddev_targp,
177 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
178 XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);
179 if (error)
180 return error;
181 xfs_buf_relse(bp);
182
183 new = nb; /* use new as a temporary here */
184 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
185 nagcount = new + (nb_mod != 0);
186 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
187 nagcount--;
188 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
189 if (nb < mp->m_sb.sb_dblocks)
190 return -EINVAL;
191 }
192 new = nb - mp->m_sb.sb_dblocks;
193 oagcount = mp->m_sb.sb_agcount;
194
195 /* allocate the new per-ag structures */
196 if (nagcount > oagcount) {
197 error = xfs_initialize_perag(mp, nagcount, &nagimax);
198 if (error)
199 return error;
200 }
201
202 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
203 XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp);
204 if (error)
205 return error;
206
207 /*
208 * Write new AG headers to disk. Non-transactional, but written
209 * synchronously so they are completed prior to the growfs transaction
210 * being logged.
211 */
212 nfree = 0;
213 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
214 __be32 *agfl_bno;
215
216 /*
217 * AG freespace header block
218 */
219 bp = xfs_growfs_get_hdr_buf(mp,
220 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
221 XFS_FSS_TO_BB(mp, 1), 0,
222 &xfs_agf_buf_ops);
223 if (!bp) {
224 error = -ENOMEM;
225 goto error0;
226 }
227
228 agf = XFS_BUF_TO_AGF(bp);
229 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
230 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
231 agf->agf_seqno = cpu_to_be32(agno);
232 if (agno == nagcount - 1)
233 agsize =
234 nb -
235 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
236 else
237 agsize = mp->m_sb.sb_agblocks;
238 agf->agf_length = cpu_to_be32(agsize);
239 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
240 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
241 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
242 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
243 agf->agf_flfirst = cpu_to_be32(1);
244 agf->agf_fllast = 0;
245 agf->agf_flcount = 0;
246 tmpsize = agsize - mp->m_ag_prealloc_blocks;
247 agf->agf_freeblks = cpu_to_be32(tmpsize);
248 agf->agf_longest = cpu_to_be32(tmpsize);
249 if (xfs_sb_version_hascrc(&mp->m_sb))
250 uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid);
251
252 error = xfs_bwrite(bp);
253 xfs_buf_relse(bp);
254 if (error)
255 goto error0;
256
257 /*
258 * AG freelist header block
259 */
260 bp = xfs_growfs_get_hdr_buf(mp,
261 XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)),
262 XFS_FSS_TO_BB(mp, 1), 0,
263 &xfs_agfl_buf_ops);
264 if (!bp) {
265 error = -ENOMEM;
266 goto error0;
267 }
268
269 agfl = XFS_BUF_TO_AGFL(bp);
270 if (xfs_sb_version_hascrc(&mp->m_sb)) {
271 agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
272 agfl->agfl_seqno = cpu_to_be32(agno);
273 uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid);
274 }
275
276 agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
277 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
278 agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
279
280 error = xfs_bwrite(bp);
281 xfs_buf_relse(bp);
282 if (error)
283 goto error0;
284
285 /*
286 * AG inode header block
287 */
288 bp = xfs_growfs_get_hdr_buf(mp,
289 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
290 XFS_FSS_TO_BB(mp, 1), 0,
291 &xfs_agi_buf_ops);
292 if (!bp) {
293 error = -ENOMEM;
294 goto error0;
295 }
296
297 agi = XFS_BUF_TO_AGI(bp);
298 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
299 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
300 agi->agi_seqno = cpu_to_be32(agno);
301 agi->agi_length = cpu_to_be32(agsize);
302 agi->agi_count = 0;
303 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
304 agi->agi_level = cpu_to_be32(1);
305 agi->agi_freecount = 0;
306 agi->agi_newino = cpu_to_be32(NULLAGINO);
307 agi->agi_dirino = cpu_to_be32(NULLAGINO);
308 if (xfs_sb_version_hascrc(&mp->m_sb))
309 uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid);
310 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
311 agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp));
312 agi->agi_free_level = cpu_to_be32(1);
313 }
314 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
315 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
316
317 error = xfs_bwrite(bp);
318 xfs_buf_relse(bp);
319 if (error)
320 goto error0;
321
322 /*
323 * BNO btree root block
324 */
325 bp = xfs_growfs_get_hdr_buf(mp,
326 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
327 BTOBB(mp->m_sb.sb_blocksize), 0,
328 &xfs_allocbt_buf_ops);
329
330 if (!bp) {
331 error = -ENOMEM;
332 goto error0;
333 }
334
335 if (xfs_sb_version_hascrc(&mp->m_sb))
336 xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1,
337 agno, XFS_BTREE_CRC_BLOCKS);
338 else
339 xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1,
340 agno, 0);
341
342 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
343 arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
344 arec->ar_blockcount = cpu_to_be32(
345 agsize - be32_to_cpu(arec->ar_startblock));
346
347 error = xfs_bwrite(bp);
348 xfs_buf_relse(bp);
349 if (error)
350 goto error0;
351
352 /*
353 * CNT btree root block
354 */
355 bp = xfs_growfs_get_hdr_buf(mp,
356 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
357 BTOBB(mp->m_sb.sb_blocksize), 0,
358 &xfs_allocbt_buf_ops);
359 if (!bp) {
360 error = -ENOMEM;
361 goto error0;
362 }
363
364 if (xfs_sb_version_hascrc(&mp->m_sb))
365 xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1,
366 agno, XFS_BTREE_CRC_BLOCKS);
367 else
368 xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1,
369 agno, 0);
370
371 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
372 arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
373 arec->ar_blockcount = cpu_to_be32(
374 agsize - be32_to_cpu(arec->ar_startblock));
375 nfree += be32_to_cpu(arec->ar_blockcount);
376
377 error = xfs_bwrite(bp);
378 xfs_buf_relse(bp);
379 if (error)
380 goto error0;
381
382 /*
383 * INO btree root block
384 */
385 bp = xfs_growfs_get_hdr_buf(mp,
386 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
387 BTOBB(mp->m_sb.sb_blocksize), 0,
388 &xfs_inobt_buf_ops);
389 if (!bp) {
390 error = -ENOMEM;
391 goto error0;
392 }
393
394 if (xfs_sb_version_hascrc(&mp->m_sb))
395 xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0,
396 agno, XFS_BTREE_CRC_BLOCKS);
397 else
398 xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0,
399 agno, 0);
400
401 error = xfs_bwrite(bp);
402 xfs_buf_relse(bp);
403 if (error)
404 goto error0;
405
406 /*
407 * FINO btree root block
408 */
409 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
410 bp = xfs_growfs_get_hdr_buf(mp,
411 XFS_AGB_TO_DADDR(mp, agno, XFS_FIBT_BLOCK(mp)),
412 BTOBB(mp->m_sb.sb_blocksize), 0,
413 &xfs_inobt_buf_ops);
414 if (!bp) {
415 error = -ENOMEM;
416 goto error0;
417 }
418
419 if (xfs_sb_version_hascrc(&mp->m_sb))
420 xfs_btree_init_block(mp, bp, XFS_FIBT_CRC_MAGIC,
421 0, 0, agno,
422 XFS_BTREE_CRC_BLOCKS);
423 else
424 xfs_btree_init_block(mp, bp, XFS_FIBT_MAGIC, 0,
425 0, agno, 0);
426
427 error = xfs_bwrite(bp);
428 xfs_buf_relse(bp);
429 if (error)
430 goto error0;
431 }
432
433 }
434 xfs_trans_agblocks_delta(tp, nfree);
435 /*
436 * There are new blocks in the old last a.g.
437 */
438 if (new) {
439 /*
440 * Change the agi length.
441 */
442 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
443 if (error) {
444 goto error0;
445 }
446 ASSERT(bp);
447 agi = XFS_BUF_TO_AGI(bp);
448 be32_add_cpu(&agi->agi_length, new);
449 ASSERT(nagcount == oagcount ||
450 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
451 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
452 /*
453 * Change agf length.
454 */
455 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
456 if (error) {
457 goto error0;
458 }
459 ASSERT(bp);
460 agf = XFS_BUF_TO_AGF(bp);
461 be32_add_cpu(&agf->agf_length, new);
462 ASSERT(be32_to_cpu(agf->agf_length) ==
463 be32_to_cpu(agi->agi_length));
464
465 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
466 /*
467 * Free the new space.
468 */
469 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
470 be32_to_cpu(agf->agf_length) - new), new);
471 if (error) {
472 goto error0;
473 }
474 }
475
476 /*
477 * Update changed superblock fields transactionally. These are not
478 * seen by the rest of the world until the transaction commit applies
479 * them atomically to the superblock.
480 */
481 if (nagcount > oagcount)
482 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
483 if (nb > mp->m_sb.sb_dblocks)
484 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
485 nb - mp->m_sb.sb_dblocks);
486 if (nfree)
487 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
488 if (dpct)
489 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
490 xfs_trans_set_sync(tp);
491 error = xfs_trans_commit(tp);
492 if (error)
493 return error;
494
495 /* New allocation groups fully initialized, so update mount struct */
496 if (nagimax)
497 mp->m_maxagi = nagimax;
498 if (mp->m_sb.sb_imax_pct) {
499 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
500 do_div(icount, 100);
501 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
502 } else
503 mp->m_maxicount = 0;
504 xfs_set_low_space_thresholds(mp);
505
506 /* update secondary superblocks. */
507 for (agno = 1; agno < nagcount; agno++) {
508 error = 0;
509 /*
510 * new secondary superblocks need to be zeroed, not read from
511 * disk as the contents of the new area we are growing into is
512 * completely unknown.
513 */
514 if (agno < oagcount) {
515 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
516 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
517 XFS_FSS_TO_BB(mp, 1), 0, &bp,
518 &xfs_sb_buf_ops);
519 } else {
520 bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
521 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
522 XFS_FSS_TO_BB(mp, 1), 0);
523 if (bp) {
524 bp->b_ops = &xfs_sb_buf_ops;
525 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
526 } else
527 error = -ENOMEM;
528 }
529
530 /*
531 * If we get an error reading or writing alternate superblocks,
532 * continue. xfs_repair chooses the "best" superblock based
533 * on most matches; if we break early, we'll leave more
534 * superblocks un-updated than updated, and xfs_repair may
535 * pick them over the properly-updated primary.
536 */
537 if (error) {
538 xfs_warn(mp,
539 "error %d reading secondary superblock for ag %d",
540 error, agno);
541 saved_error = error;
542 continue;
543 }
544 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
545
546 error = xfs_bwrite(bp);
547 xfs_buf_relse(bp);
548 if (error) {
549 xfs_warn(mp,
550 "write error %d updating secondary superblock for ag %d",
551 error, agno);
552 saved_error = error;
553 continue;
554 }
555 }
556 return saved_error ? saved_error : error;
557
558 error0:
559 xfs_trans_cancel(tp);
560 return error;
561}
562
563static int
564xfs_growfs_log_private(
565 xfs_mount_t *mp, /* mount point for filesystem */
566 xfs_growfs_log_t *in) /* growfs log input struct */
567{
568 xfs_extlen_t nb;
569
570 nb = in->newblocks;
571 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
572 return -EINVAL;
573 if (nb == mp->m_sb.sb_logblocks &&
574 in->isint == (mp->m_sb.sb_logstart != 0))
575 return -EINVAL;
576 /*
577 * Moving the log is hard, need new interfaces to sync
578 * the log first, hold off all activity while moving it.
579 * Can have shorter or longer log in the same space,
580 * or transform internal to external log or vice versa.
581 */
582 return -ENOSYS;
583}
584
585/*
586 * protected versions of growfs function acquire and release locks on the mount
587 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
588 * XFS_IOC_FSGROWFSRT
589 */
590
591
592int
593xfs_growfs_data(
594 xfs_mount_t *mp,
595 xfs_growfs_data_t *in)
596{
597 int error;
598
599 if (!capable(CAP_SYS_ADMIN))
600 return -EPERM;
601 if (!mutex_trylock(&mp->m_growlock))
602 return -EWOULDBLOCK;
603 error = xfs_growfs_data_private(mp, in);
604 /*
605 * Increment the generation unconditionally, the error could be from
606 * updating the secondary superblocks, in which case the new size
607 * is live already.
608 */
609 mp->m_generation++;
610 mutex_unlock(&mp->m_growlock);
611 return error;
612}
613
614int
615xfs_growfs_log(
616 xfs_mount_t *mp,
617 xfs_growfs_log_t *in)
618{
619 int error;
620
621 if (!capable(CAP_SYS_ADMIN))
622 return -EPERM;
623 if (!mutex_trylock(&mp->m_growlock))
624 return -EWOULDBLOCK;
625 error = xfs_growfs_log_private(mp, in);
626 mutex_unlock(&mp->m_growlock);
627 return error;
628}
629
630/*
631 * exported through ioctl XFS_IOC_FSCOUNTS
632 */
633
634int
635xfs_fs_counts(
636 xfs_mount_t *mp,
637 xfs_fsop_counts_t *cnt)
638{
639 cnt->allocino = percpu_counter_read_positive(&mp->m_icount);
640 cnt->freeino = percpu_counter_read_positive(&mp->m_ifree);
641 cnt->freedata = percpu_counter_read_positive(&mp->m_fdblocks) -
642 XFS_ALLOC_SET_ASIDE(mp);
643
644 spin_lock(&mp->m_sb_lock);
645 cnt->freertx = mp->m_sb.sb_frextents;
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
665int
666xfs_reserve_blocks(
667 xfs_mount_t *mp,
668 __uint64_t *inval,
669 xfs_fsop_resblks_t *outval)
670{
671 __int64_t lcounter, delta;
672 __int64_t fdblks_delta = 0;
673 __uint64_t request;
674 __int64_t free;
675 int error = 0;
676
677 /* If inval is null, report current values and return */
678 if (inval == (__uint64_t *)NULL) {
679 if (!outval)
680 return -EINVAL;
681 outval->resblks = mp->m_resblks;
682 outval->resblks_avail = mp->m_resblks_avail;
683 return 0;
684 }
685
686 request = *inval;
687
688 /*
689 * With per-cpu counters, this becomes an interesting problem. we need
690 * to work out if we are freeing or allocation blocks first, then we can
691 * do the modification as necessary.
692 *
693 * We do this under the m_sb_lock so that if we are near ENOSPC, we will
694 * hold out any changes while we work out what to do. This means that
695 * the amount of free space can change while we do this, so we need to
696 * retry if we end up trying to reserve more space than is available.
697 */
698 spin_lock(&mp->m_sb_lock);
699
700 /*
701 * If our previous reservation was larger than the current value,
702 * then move any unused blocks back to the free pool. Modify the resblks
703 * counters directly since we shouldn't have any problems unreserving
704 * space.
705 */
706 if (mp->m_resblks > request) {
707 lcounter = mp->m_resblks_avail - request;
708 if (lcounter > 0) { /* release unused blocks */
709 fdblks_delta = lcounter;
710 mp->m_resblks_avail -= lcounter;
711 }
712 mp->m_resblks = request;
713 if (fdblks_delta) {
714 spin_unlock(&mp->m_sb_lock);
715 error = xfs_mod_fdblocks(mp, fdblks_delta, 0);
716 spin_lock(&mp->m_sb_lock);
717 }
718
719 goto out;
720 }
721
722 /*
723 * If the request is larger than the current reservation, reserve the
724 * blocks before we update the reserve counters. Sample m_fdblocks and
725 * perform a partial reservation if the request exceeds free space.
726 */
727 error = -ENOSPC;
728 do {
729 free = percpu_counter_sum(&mp->m_fdblocks) -
730 XFS_ALLOC_SET_ASIDE(mp);
731 if (!free)
732 break;
733
734 delta = request - mp->m_resblks;
735 lcounter = free - delta;
736 if (lcounter < 0)
737 /* We can't satisfy the request, just get what we can */
738 fdblks_delta = free;
739 else
740 fdblks_delta = delta;
741
742 /*
743 * We'll either succeed in getting space from the free block
744 * count or we'll get an ENOSPC. If we get a ENOSPC, it means
745 * things changed while we were calculating fdblks_delta and so
746 * we should try again to see if there is anything left to
747 * 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 spin_unlock(&mp->m_sb_lock);
753 error = xfs_mod_fdblocks(mp, -fdblks_delta, 0);
754 spin_lock(&mp->m_sb_lock);
755 } while (error == -ENOSPC);
756
757 /*
758 * Update the reserve counters if blocks have been successfully
759 * allocated.
760 */
761 if (!error && fdblks_delta) {
762 mp->m_resblks += fdblks_delta;
763 mp->m_resblks_avail += fdblks_delta;
764 }
765
766out:
767 if (outval) {
768 outval->resblks = mp->m_resblks;
769 outval->resblks_avail = mp->m_resblks_avail;
770 }
771
772 spin_unlock(&mp->m_sb_lock);
773 return error;
774}
775
776int
777xfs_fs_goingdown(
778 xfs_mount_t *mp,
779 __uint32_t inflags)
780{
781 switch (inflags) {
782 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
783 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
784
785 if (sb && !IS_ERR(sb)) {
786 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
787 thaw_bdev(sb->s_bdev, sb);
788 }
789
790 break;
791 }
792 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
793 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
794 break;
795 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
796 xfs_force_shutdown(mp,
797 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
798 break;
799 default:
800 return -EINVAL;
801 }
802
803 return 0;
804}
805
806/*
807 * Force a shutdown of the filesystem instantly while keeping the filesystem
808 * consistent. We don't do an unmount here; just shutdown the shop, make sure
809 * that absolutely nothing persistent happens to this filesystem after this
810 * point.
811 */
812void
813xfs_do_force_shutdown(
814 xfs_mount_t *mp,
815 int flags,
816 char *fname,
817 int lnnum)
818{
819 int logerror;
820
821 logerror = flags & SHUTDOWN_LOG_IO_ERROR;
822
823 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
824 xfs_notice(mp,
825 "%s(0x%x) called from line %d of file %s. Return address = 0x%p",
826 __func__, flags, lnnum, fname, __return_address);
827 }
828 /*
829 * No need to duplicate efforts.
830 */
831 if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
832 return;
833
834 /*
835 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
836 * queue up anybody new on the log reservations, and wakes up
837 * everybody who's sleeping on log reservations to tell them
838 * the bad news.
839 */
840 if (xfs_log_force_umount(mp, logerror))
841 return;
842
843 if (flags & SHUTDOWN_CORRUPT_INCORE) {
844 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
845 "Corruption of in-memory data detected. Shutting down filesystem");
846 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
847 xfs_stack_trace();
848 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
849 if (logerror) {
850 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
851 "Log I/O Error Detected. Shutting down filesystem");
852 } else if (flags & SHUTDOWN_DEVICE_REQ) {
853 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
854 "All device paths lost. Shutting down filesystem");
855 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
856 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
857 "I/O Error Detected. Shutting down filesystem");
858 }
859 }
860 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
861 xfs_alert(mp,
862 "Please umount the filesystem and rectify the problem(s)");
863 }
864}
Linux kernel - Deliverables
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