Loading...
1/*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18#include "xfs.h"
19#include "xfs_fs.h"
20#include "xfs_types.h"
21#include "xfs_bit.h"
22#include "xfs_inum.h"
23#include "xfs_log.h"
24#include "xfs_trans.h"
25#include "xfs_sb.h"
26#include "xfs_ag.h"
27#include "xfs_mount.h"
28#include "xfs_bmap_btree.h"
29#include "xfs_alloc_btree.h"
30#include "xfs_ialloc_btree.h"
31#include "xfs_dinode.h"
32#include "xfs_inode.h"
33#include "xfs_inode_item.h"
34#include "xfs_btree.h"
35#include "xfs_error.h"
36#include "xfs_alloc.h"
37#include "xfs_ialloc.h"
38#include "xfs_fsops.h"
39#include "xfs_itable.h"
40#include "xfs_trans_space.h"
41#include "xfs_rtalloc.h"
42#include "xfs_rw.h"
43#include "xfs_filestream.h"
44#include "xfs_trace.h"
45
46/*
47 * File system operations
48 */
49
50int
51xfs_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 =
80 (xfs_sb_version_hasattr(&mp->m_sb) ?
81 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
82 (xfs_sb_version_hasnlink(&mp->m_sb) ?
83 XFS_FSOP_GEOM_FLAGS_NLINK : 0) |
84 (xfs_sb_version_hasquota(&mp->m_sb) ?
85 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
86 (xfs_sb_version_hasalign(&mp->m_sb) ?
87 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
88 (xfs_sb_version_hasdalign(&mp->m_sb) ?
89 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
90 (xfs_sb_version_hasshared(&mp->m_sb) ?
91 XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
92 (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
93 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
94 (xfs_sb_version_hasdirv2(&mp->m_sb) ?
95 XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) |
96 (xfs_sb_version_hassector(&mp->m_sb) ?
97 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
98 (xfs_sb_version_hasasciici(&mp->m_sb) ?
99 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
100 (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
101 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
102 (xfs_sb_version_hasattr2(&mp->m_sb) ?
103 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0);
104 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
105 mp->m_sb.sb_logsectsize : BBSIZE;
106 geo->rtsectsize = mp->m_sb.sb_blocksize;
107 geo->dirblocksize = mp->m_dirblksize;
108 }
109 if (new_version >= 4) {
110 geo->flags |=
111 (xfs_sb_version_haslogv2(&mp->m_sb) ?
112 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
113 geo->logsunit = mp->m_sb.sb_logsunit;
114 }
115 return 0;
116}
117
118static int
119xfs_growfs_data_private(
120 xfs_mount_t *mp, /* mount point for filesystem */
121 xfs_growfs_data_t *in) /* growfs data input struct */
122{
123 xfs_agf_t *agf;
124 xfs_agi_t *agi;
125 xfs_agnumber_t agno;
126 xfs_extlen_t agsize;
127 xfs_extlen_t tmpsize;
128 xfs_alloc_rec_t *arec;
129 struct xfs_btree_block *block;
130 xfs_buf_t *bp;
131 int bucket;
132 int dpct;
133 int error;
134 xfs_agnumber_t nagcount;
135 xfs_agnumber_t nagimax = 0;
136 xfs_rfsblock_t nb, nb_mod;
137 xfs_rfsblock_t new;
138 xfs_rfsblock_t nfree;
139 xfs_agnumber_t oagcount;
140 int pct;
141 xfs_trans_t *tp;
142
143 nb = in->newblocks;
144 pct = in->imaxpct;
145 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
146 return XFS_ERROR(EINVAL);
147 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
148 return error;
149 dpct = pct - mp->m_sb.sb_imax_pct;
150 bp = xfs_buf_read_uncached(mp, mp->m_ddev_targp,
151 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
152 BBTOB(XFS_FSS_TO_BB(mp, 1)), 0);
153 if (!bp)
154 return EIO;
155 xfs_buf_relse(bp);
156
157 new = nb; /* use new as a temporary here */
158 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
159 nagcount = new + (nb_mod != 0);
160 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
161 nagcount--;
162 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
163 if (nb < mp->m_sb.sb_dblocks)
164 return XFS_ERROR(EINVAL);
165 }
166 new = nb - mp->m_sb.sb_dblocks;
167 oagcount = mp->m_sb.sb_agcount;
168
169 /* allocate the new per-ag structures */
170 if (nagcount > oagcount) {
171 error = xfs_initialize_perag(mp, nagcount, &nagimax);
172 if (error)
173 return error;
174 }
175
176 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
177 tp->t_flags |= XFS_TRANS_RESERVE;
178 if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
179 XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
180 xfs_trans_cancel(tp, 0);
181 return error;
182 }
183
184 /*
185 * Write new AG headers to disk. Non-transactional, but written
186 * synchronously so they are completed prior to the growfs transaction
187 * being logged.
188 */
189 nfree = 0;
190 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
191 /*
192 * AG freelist header block
193 */
194 bp = xfs_buf_get(mp->m_ddev_targp,
195 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
196 XFS_FSS_TO_BB(mp, 1), XBF_LOCK | XBF_MAPPED);
197 agf = XFS_BUF_TO_AGF(bp);
198 memset(agf, 0, mp->m_sb.sb_sectsize);
199 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
200 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
201 agf->agf_seqno = cpu_to_be32(agno);
202 if (agno == nagcount - 1)
203 agsize =
204 nb -
205 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
206 else
207 agsize = mp->m_sb.sb_agblocks;
208 agf->agf_length = cpu_to_be32(agsize);
209 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
210 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
211 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
212 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
213 agf->agf_flfirst = 0;
214 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
215 agf->agf_flcount = 0;
216 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
217 agf->agf_freeblks = cpu_to_be32(tmpsize);
218 agf->agf_longest = cpu_to_be32(tmpsize);
219 error = xfs_bwrite(mp, bp);
220 if (error) {
221 goto error0;
222 }
223 /*
224 * AG inode header block
225 */
226 bp = xfs_buf_get(mp->m_ddev_targp,
227 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
228 XFS_FSS_TO_BB(mp, 1), XBF_LOCK | XBF_MAPPED);
229 agi = XFS_BUF_TO_AGI(bp);
230 memset(agi, 0, mp->m_sb.sb_sectsize);
231 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
232 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
233 agi->agi_seqno = cpu_to_be32(agno);
234 agi->agi_length = cpu_to_be32(agsize);
235 agi->agi_count = 0;
236 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
237 agi->agi_level = cpu_to_be32(1);
238 agi->agi_freecount = 0;
239 agi->agi_newino = cpu_to_be32(NULLAGINO);
240 agi->agi_dirino = cpu_to_be32(NULLAGINO);
241 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
242 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
243 error = xfs_bwrite(mp, bp);
244 if (error) {
245 goto error0;
246 }
247 /*
248 * BNO btree root block
249 */
250 bp = xfs_buf_get(mp->m_ddev_targp,
251 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
252 BTOBB(mp->m_sb.sb_blocksize),
253 XBF_LOCK | XBF_MAPPED);
254 block = XFS_BUF_TO_BLOCK(bp);
255 memset(block, 0, mp->m_sb.sb_blocksize);
256 block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC);
257 block->bb_level = 0;
258 block->bb_numrecs = cpu_to_be16(1);
259 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
260 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
261 arec = XFS_ALLOC_REC_ADDR(mp, block, 1);
262 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
263 arec->ar_blockcount = cpu_to_be32(
264 agsize - be32_to_cpu(arec->ar_startblock));
265 error = xfs_bwrite(mp, bp);
266 if (error) {
267 goto error0;
268 }
269 /*
270 * CNT btree root block
271 */
272 bp = xfs_buf_get(mp->m_ddev_targp,
273 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
274 BTOBB(mp->m_sb.sb_blocksize),
275 XBF_LOCK | XBF_MAPPED);
276 block = XFS_BUF_TO_BLOCK(bp);
277 memset(block, 0, mp->m_sb.sb_blocksize);
278 block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC);
279 block->bb_level = 0;
280 block->bb_numrecs = cpu_to_be16(1);
281 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
282 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
283 arec = XFS_ALLOC_REC_ADDR(mp, block, 1);
284 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
285 arec->ar_blockcount = cpu_to_be32(
286 agsize - be32_to_cpu(arec->ar_startblock));
287 nfree += be32_to_cpu(arec->ar_blockcount);
288 error = xfs_bwrite(mp, bp);
289 if (error) {
290 goto error0;
291 }
292 /*
293 * INO btree root block
294 */
295 bp = xfs_buf_get(mp->m_ddev_targp,
296 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
297 BTOBB(mp->m_sb.sb_blocksize),
298 XBF_LOCK | XBF_MAPPED);
299 block = XFS_BUF_TO_BLOCK(bp);
300 memset(block, 0, mp->m_sb.sb_blocksize);
301 block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC);
302 block->bb_level = 0;
303 block->bb_numrecs = 0;
304 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
305 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
306 error = xfs_bwrite(mp, bp);
307 if (error) {
308 goto error0;
309 }
310 }
311 xfs_trans_agblocks_delta(tp, nfree);
312 /*
313 * There are new blocks in the old last a.g.
314 */
315 if (new) {
316 /*
317 * Change the agi length.
318 */
319 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
320 if (error) {
321 goto error0;
322 }
323 ASSERT(bp);
324 agi = XFS_BUF_TO_AGI(bp);
325 be32_add_cpu(&agi->agi_length, new);
326 ASSERT(nagcount == oagcount ||
327 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
328 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
329 /*
330 * Change agf length.
331 */
332 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
333 if (error) {
334 goto error0;
335 }
336 ASSERT(bp);
337 agf = XFS_BUF_TO_AGF(bp);
338 be32_add_cpu(&agf->agf_length, new);
339 ASSERT(be32_to_cpu(agf->agf_length) ==
340 be32_to_cpu(agi->agi_length));
341
342 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
343 /*
344 * Free the new space.
345 */
346 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
347 be32_to_cpu(agf->agf_length) - new), new);
348 if (error) {
349 goto error0;
350 }
351 }
352
353 /*
354 * Update changed superblock fields transactionally. These are not
355 * seen by the rest of the world until the transaction commit applies
356 * them atomically to the superblock.
357 */
358 if (nagcount > oagcount)
359 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
360 if (nb > mp->m_sb.sb_dblocks)
361 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
362 nb - mp->m_sb.sb_dblocks);
363 if (nfree)
364 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
365 if (dpct)
366 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
367 error = xfs_trans_commit(tp, 0);
368 if (error)
369 return error;
370
371 /* New allocation groups fully initialized, so update mount struct */
372 if (nagimax)
373 mp->m_maxagi = nagimax;
374 if (mp->m_sb.sb_imax_pct) {
375 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
376 do_div(icount, 100);
377 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
378 } else
379 mp->m_maxicount = 0;
380 xfs_set_low_space_thresholds(mp);
381
382 /* update secondary superblocks. */
383 for (agno = 1; agno < nagcount; agno++) {
384 error = xfs_read_buf(mp, mp->m_ddev_targp,
385 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
386 XFS_FSS_TO_BB(mp, 1), 0, &bp);
387 if (error) {
388 xfs_warn(mp,
389 "error %d reading secondary superblock for ag %d",
390 error, agno);
391 break;
392 }
393 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
394 /*
395 * If we get an error writing out the alternate superblocks,
396 * just issue a warning and continue. The real work is
397 * already done and committed.
398 */
399 if (!(error = xfs_bwrite(mp, bp))) {
400 continue;
401 } else {
402 xfs_warn(mp,
403 "write error %d updating secondary superblock for ag %d",
404 error, agno);
405 break; /* no point in continuing */
406 }
407 }
408 return 0;
409
410 error0:
411 xfs_trans_cancel(tp, XFS_TRANS_ABORT);
412 return error;
413}
414
415static int
416xfs_growfs_log_private(
417 xfs_mount_t *mp, /* mount point for filesystem */
418 xfs_growfs_log_t *in) /* growfs log input struct */
419{
420 xfs_extlen_t nb;
421
422 nb = in->newblocks;
423 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
424 return XFS_ERROR(EINVAL);
425 if (nb == mp->m_sb.sb_logblocks &&
426 in->isint == (mp->m_sb.sb_logstart != 0))
427 return XFS_ERROR(EINVAL);
428 /*
429 * Moving the log is hard, need new interfaces to sync
430 * the log first, hold off all activity while moving it.
431 * Can have shorter or longer log in the same space,
432 * or transform internal to external log or vice versa.
433 */
434 return XFS_ERROR(ENOSYS);
435}
436
437/*
438 * protected versions of growfs function acquire and release locks on the mount
439 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
440 * XFS_IOC_FSGROWFSRT
441 */
442
443
444int
445xfs_growfs_data(
446 xfs_mount_t *mp,
447 xfs_growfs_data_t *in)
448{
449 int error;
450
451 if (!capable(CAP_SYS_ADMIN))
452 return XFS_ERROR(EPERM);
453 if (!mutex_trylock(&mp->m_growlock))
454 return XFS_ERROR(EWOULDBLOCK);
455 error = xfs_growfs_data_private(mp, in);
456 mutex_unlock(&mp->m_growlock);
457 return error;
458}
459
460int
461xfs_growfs_log(
462 xfs_mount_t *mp,
463 xfs_growfs_log_t *in)
464{
465 int error;
466
467 if (!capable(CAP_SYS_ADMIN))
468 return XFS_ERROR(EPERM);
469 if (!mutex_trylock(&mp->m_growlock))
470 return XFS_ERROR(EWOULDBLOCK);
471 error = xfs_growfs_log_private(mp, in);
472 mutex_unlock(&mp->m_growlock);
473 return error;
474}
475
476/*
477 * exported through ioctl XFS_IOC_FSCOUNTS
478 */
479
480int
481xfs_fs_counts(
482 xfs_mount_t *mp,
483 xfs_fsop_counts_t *cnt)
484{
485 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
486 spin_lock(&mp->m_sb_lock);
487 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
488 cnt->freertx = mp->m_sb.sb_frextents;
489 cnt->freeino = mp->m_sb.sb_ifree;
490 cnt->allocino = mp->m_sb.sb_icount;
491 spin_unlock(&mp->m_sb_lock);
492 return 0;
493}
494
495/*
496 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
497 *
498 * xfs_reserve_blocks is called to set m_resblks
499 * in the in-core mount table. The number of unused reserved blocks
500 * is kept in m_resblks_avail.
501 *
502 * Reserve the requested number of blocks if available. Otherwise return
503 * as many as possible to satisfy the request. The actual number
504 * reserved are returned in outval
505 *
506 * A null inval pointer indicates that only the current reserved blocks
507 * available should be returned no settings are changed.
508 */
509
510int
511xfs_reserve_blocks(
512 xfs_mount_t *mp,
513 __uint64_t *inval,
514 xfs_fsop_resblks_t *outval)
515{
516 __int64_t lcounter, delta, fdblks_delta;
517 __uint64_t request;
518
519 /* If inval is null, report current values and return */
520 if (inval == (__uint64_t *)NULL) {
521 if (!outval)
522 return EINVAL;
523 outval->resblks = mp->m_resblks;
524 outval->resblks_avail = mp->m_resblks_avail;
525 return 0;
526 }
527
528 request = *inval;
529
530 /*
531 * With per-cpu counters, this becomes an interesting
532 * problem. we needto work out if we are freeing or allocation
533 * blocks first, then we can do the modification as necessary.
534 *
535 * We do this under the m_sb_lock so that if we are near
536 * ENOSPC, we will hold out any changes while we work out
537 * what to do. This means that the amount of free space can
538 * change while we do this, so we need to retry if we end up
539 * trying to reserve more space than is available.
540 *
541 * We also use the xfs_mod_incore_sb() interface so that we
542 * don't have to care about whether per cpu counter are
543 * enabled, disabled or even compiled in....
544 */
545retry:
546 spin_lock(&mp->m_sb_lock);
547 xfs_icsb_sync_counters_locked(mp, 0);
548
549 /*
550 * If our previous reservation was larger than the current value,
551 * then move any unused blocks back to the free pool.
552 */
553 fdblks_delta = 0;
554 if (mp->m_resblks > request) {
555 lcounter = mp->m_resblks_avail - request;
556 if (lcounter > 0) { /* release unused blocks */
557 fdblks_delta = lcounter;
558 mp->m_resblks_avail -= lcounter;
559 }
560 mp->m_resblks = request;
561 } else {
562 __int64_t free;
563
564 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
565 if (!free)
566 goto out; /* ENOSPC and fdblks_delta = 0 */
567
568 delta = request - mp->m_resblks;
569 lcounter = free - delta;
570 if (lcounter < 0) {
571 /* We can't satisfy the request, just get what we can */
572 mp->m_resblks += free;
573 mp->m_resblks_avail += free;
574 fdblks_delta = -free;
575 } else {
576 fdblks_delta = -delta;
577 mp->m_resblks = request;
578 mp->m_resblks_avail += delta;
579 }
580 }
581out:
582 if (outval) {
583 outval->resblks = mp->m_resblks;
584 outval->resblks_avail = mp->m_resblks_avail;
585 }
586 spin_unlock(&mp->m_sb_lock);
587
588 if (fdblks_delta) {
589 /*
590 * If we are putting blocks back here, m_resblks_avail is
591 * already at its max so this will put it in the free pool.
592 *
593 * If we need space, we'll either succeed in getting it
594 * from the free block count or we'll get an enospc. If
595 * we get a ENOSPC, it means things changed while we were
596 * calculating fdblks_delta and so we should try again to
597 * see if there is anything left to reserve.
598 *
599 * Don't set the reserved flag here - we don't want to reserve
600 * the extra reserve blocks from the reserve.....
601 */
602 int error;
603 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
604 fdblks_delta, 0);
605 if (error == ENOSPC)
606 goto retry;
607 }
608 return 0;
609}
610
611/*
612 * Dump a transaction into the log that contains no real change. This is needed
613 * to be able to make the log dirty or stamp the current tail LSN into the log
614 * during the covering operation.
615 *
616 * We cannot use an inode here for this - that will push dirty state back up
617 * into the VFS and then periodic inode flushing will prevent log covering from
618 * making progress. Hence we log a field in the superblock instead and use a
619 * synchronous transaction to ensure the superblock is immediately unpinned
620 * and can be written back.
621 */
622int
623xfs_fs_log_dummy(
624 xfs_mount_t *mp)
625{
626 xfs_trans_t *tp;
627 int error;
628
629 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
630 error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
631 XFS_DEFAULT_LOG_COUNT);
632 if (error) {
633 xfs_trans_cancel(tp, 0);
634 return error;
635 }
636
637 /* log the UUID because it is an unchanging field */
638 xfs_mod_sb(tp, XFS_SB_UUID);
639 xfs_trans_set_sync(tp);
640 return xfs_trans_commit(tp, 0);
641}
642
643int
644xfs_fs_goingdown(
645 xfs_mount_t *mp,
646 __uint32_t inflags)
647{
648 switch (inflags) {
649 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
650 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
651
652 if (sb && !IS_ERR(sb)) {
653 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
654 thaw_bdev(sb->s_bdev, sb);
655 }
656
657 break;
658 }
659 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
660 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
661 break;
662 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
663 xfs_force_shutdown(mp,
664 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
665 break;
666 default:
667 return XFS_ERROR(EINVAL);
668 }
669
670 return 0;
671}
1/*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18#include "xfs.h"
19#include "xfs_fs.h"
20#include "xfs_types.h"
21#include "xfs_log.h"
22#include "xfs_trans.h"
23#include "xfs_sb.h"
24#include "xfs_ag.h"
25#include "xfs_mount.h"
26#include "xfs_bmap_btree.h"
27#include "xfs_alloc_btree.h"
28#include "xfs_ialloc_btree.h"
29#include "xfs_dinode.h"
30#include "xfs_inode.h"
31#include "xfs_inode_item.h"
32#include "xfs_btree.h"
33#include "xfs_error.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_filestream.h"
41#include "xfs_trace.h"
42
43/*
44 * File system operations
45 */
46
47int
48xfs_fs_geometry(
49 xfs_mount_t *mp,
50 xfs_fsop_geom_t *geo,
51 int new_version)
52{
53
54 memset(geo, 0, sizeof(*geo));
55
56 geo->blocksize = mp->m_sb.sb_blocksize;
57 geo->rtextsize = mp->m_sb.sb_rextsize;
58 geo->agblocks = mp->m_sb.sb_agblocks;
59 geo->agcount = mp->m_sb.sb_agcount;
60 geo->logblocks = mp->m_sb.sb_logblocks;
61 geo->sectsize = mp->m_sb.sb_sectsize;
62 geo->inodesize = mp->m_sb.sb_inodesize;
63 geo->imaxpct = mp->m_sb.sb_imax_pct;
64 geo->datablocks = mp->m_sb.sb_dblocks;
65 geo->rtblocks = mp->m_sb.sb_rblocks;
66 geo->rtextents = mp->m_sb.sb_rextents;
67 geo->logstart = mp->m_sb.sb_logstart;
68 ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
69 memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
70 if (new_version >= 2) {
71 geo->sunit = mp->m_sb.sb_unit;
72 geo->swidth = mp->m_sb.sb_width;
73 }
74 if (new_version >= 3) {
75 geo->version = XFS_FSOP_GEOM_VERSION;
76 geo->flags =
77 (xfs_sb_version_hasattr(&mp->m_sb) ?
78 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
79 (xfs_sb_version_hasnlink(&mp->m_sb) ?
80 XFS_FSOP_GEOM_FLAGS_NLINK : 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_hasshared(&mp->m_sb) ?
88 XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
89 (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
90 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
91 (xfs_sb_version_hasdirv2(&mp->m_sb) ?
92 XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) |
93 (xfs_sb_version_hassector(&mp->m_sb) ?
94 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
95 (xfs_sb_version_hasasciici(&mp->m_sb) ?
96 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
97 (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
98 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
99 (xfs_sb_version_hasattr2(&mp->m_sb) ?
100 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0);
101 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
102 mp->m_sb.sb_logsectsize : BBSIZE;
103 geo->rtsectsize = mp->m_sb.sb_blocksize;
104 geo->dirblocksize = mp->m_dirblksize;
105 }
106 if (new_version >= 4) {
107 geo->flags |=
108 (xfs_sb_version_haslogv2(&mp->m_sb) ?
109 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
110 geo->logsunit = mp->m_sb.sb_logsunit;
111 }
112 return 0;
113}
114
115static int
116xfs_growfs_data_private(
117 xfs_mount_t *mp, /* mount point for filesystem */
118 xfs_growfs_data_t *in) /* growfs data input struct */
119{
120 xfs_agf_t *agf;
121 xfs_agi_t *agi;
122 xfs_agnumber_t agno;
123 xfs_extlen_t agsize;
124 xfs_extlen_t tmpsize;
125 xfs_alloc_rec_t *arec;
126 struct xfs_btree_block *block;
127 xfs_buf_t *bp;
128 int bucket;
129 int dpct;
130 int error;
131 xfs_agnumber_t nagcount;
132 xfs_agnumber_t nagimax = 0;
133 xfs_rfsblock_t nb, nb_mod;
134 xfs_rfsblock_t new;
135 xfs_rfsblock_t nfree;
136 xfs_agnumber_t oagcount;
137 int pct;
138 xfs_trans_t *tp;
139
140 nb = in->newblocks;
141 pct = in->imaxpct;
142 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
143 return XFS_ERROR(EINVAL);
144 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
145 return error;
146 dpct = pct - mp->m_sb.sb_imax_pct;
147 bp = xfs_buf_read_uncached(mp->m_ddev_targp,
148 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
149 XFS_FSS_TO_BB(mp, 1), 0);
150 if (!bp)
151 return EIO;
152 xfs_buf_relse(bp);
153
154 new = nb; /* use new as a temporary here */
155 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
156 nagcount = new + (nb_mod != 0);
157 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
158 nagcount--;
159 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
160 if (nb < mp->m_sb.sb_dblocks)
161 return XFS_ERROR(EINVAL);
162 }
163 new = nb - mp->m_sb.sb_dblocks;
164 oagcount = mp->m_sb.sb_agcount;
165
166 /* allocate the new per-ag structures */
167 if (nagcount > oagcount) {
168 error = xfs_initialize_perag(mp, nagcount, &nagimax);
169 if (error)
170 return error;
171 }
172
173 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
174 tp->t_flags |= XFS_TRANS_RESERVE;
175 if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
176 XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
177 xfs_trans_cancel(tp, 0);
178 return error;
179 }
180
181 /*
182 * Write new AG headers to disk. Non-transactional, but written
183 * synchronously so they are completed prior to the growfs transaction
184 * being logged.
185 */
186 nfree = 0;
187 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
188 /*
189 * AG freelist header block
190 */
191 bp = xfs_buf_get(mp->m_ddev_targp,
192 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
193 XFS_FSS_TO_BB(mp, 1), 0);
194 if (!bp) {
195 error = ENOMEM;
196 goto error0;
197 }
198 agf = XFS_BUF_TO_AGF(bp);
199 memset(agf, 0, mp->m_sb.sb_sectsize);
200 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
201 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
202 agf->agf_seqno = cpu_to_be32(agno);
203 if (agno == nagcount - 1)
204 agsize =
205 nb -
206 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
207 else
208 agsize = mp->m_sb.sb_agblocks;
209 agf->agf_length = cpu_to_be32(agsize);
210 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
211 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
212 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
213 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
214 agf->agf_flfirst = 0;
215 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
216 agf->agf_flcount = 0;
217 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
218 agf->agf_freeblks = cpu_to_be32(tmpsize);
219 agf->agf_longest = cpu_to_be32(tmpsize);
220 error = xfs_bwrite(bp);
221 xfs_buf_relse(bp);
222 if (error)
223 goto error0;
224
225 /*
226 * AG inode header block
227 */
228 bp = xfs_buf_get(mp->m_ddev_targp,
229 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
230 XFS_FSS_TO_BB(mp, 1), 0);
231 if (!bp) {
232 error = ENOMEM;
233 goto error0;
234 }
235 agi = XFS_BUF_TO_AGI(bp);
236 memset(agi, 0, mp->m_sb.sb_sectsize);
237 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
238 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
239 agi->agi_seqno = cpu_to_be32(agno);
240 agi->agi_length = cpu_to_be32(agsize);
241 agi->agi_count = 0;
242 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
243 agi->agi_level = cpu_to_be32(1);
244 agi->agi_freecount = 0;
245 agi->agi_newino = cpu_to_be32(NULLAGINO);
246 agi->agi_dirino = cpu_to_be32(NULLAGINO);
247 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
248 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
249 error = xfs_bwrite(bp);
250 xfs_buf_relse(bp);
251 if (error)
252 goto error0;
253
254 /*
255 * BNO btree root block
256 */
257 bp = xfs_buf_get(mp->m_ddev_targp,
258 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
259 BTOBB(mp->m_sb.sb_blocksize), 0);
260 if (!bp) {
261 error = ENOMEM;
262 goto error0;
263 }
264 block = XFS_BUF_TO_BLOCK(bp);
265 memset(block, 0, mp->m_sb.sb_blocksize);
266 block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC);
267 block->bb_level = 0;
268 block->bb_numrecs = cpu_to_be16(1);
269 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
270 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
271 arec = XFS_ALLOC_REC_ADDR(mp, block, 1);
272 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
273 arec->ar_blockcount = cpu_to_be32(
274 agsize - be32_to_cpu(arec->ar_startblock));
275 error = xfs_bwrite(bp);
276 xfs_buf_relse(bp);
277 if (error)
278 goto error0;
279
280 /*
281 * CNT btree root block
282 */
283 bp = xfs_buf_get(mp->m_ddev_targp,
284 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
285 BTOBB(mp->m_sb.sb_blocksize), 0);
286 if (!bp) {
287 error = ENOMEM;
288 goto error0;
289 }
290 block = XFS_BUF_TO_BLOCK(bp);
291 memset(block, 0, mp->m_sb.sb_blocksize);
292 block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC);
293 block->bb_level = 0;
294 block->bb_numrecs = cpu_to_be16(1);
295 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
296 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
297 arec = XFS_ALLOC_REC_ADDR(mp, block, 1);
298 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
299 arec->ar_blockcount = cpu_to_be32(
300 agsize - be32_to_cpu(arec->ar_startblock));
301 nfree += be32_to_cpu(arec->ar_blockcount);
302 error = xfs_bwrite(bp);
303 xfs_buf_relse(bp);
304 if (error)
305 goto error0;
306
307 /*
308 * INO btree root block
309 */
310 bp = xfs_buf_get(mp->m_ddev_targp,
311 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
312 BTOBB(mp->m_sb.sb_blocksize), 0);
313 if (!bp) {
314 error = ENOMEM;
315 goto error0;
316 }
317 block = XFS_BUF_TO_BLOCK(bp);
318 memset(block, 0, mp->m_sb.sb_blocksize);
319 block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC);
320 block->bb_level = 0;
321 block->bb_numrecs = 0;
322 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
323 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
324 error = xfs_bwrite(bp);
325 xfs_buf_relse(bp);
326 if (error)
327 goto error0;
328 }
329 xfs_trans_agblocks_delta(tp, nfree);
330 /*
331 * There are new blocks in the old last a.g.
332 */
333 if (new) {
334 /*
335 * Change the agi length.
336 */
337 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
338 if (error) {
339 goto error0;
340 }
341 ASSERT(bp);
342 agi = XFS_BUF_TO_AGI(bp);
343 be32_add_cpu(&agi->agi_length, new);
344 ASSERT(nagcount == oagcount ||
345 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
346 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
347 /*
348 * Change agf length.
349 */
350 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
351 if (error) {
352 goto error0;
353 }
354 ASSERT(bp);
355 agf = XFS_BUF_TO_AGF(bp);
356 be32_add_cpu(&agf->agf_length, new);
357 ASSERT(be32_to_cpu(agf->agf_length) ==
358 be32_to_cpu(agi->agi_length));
359
360 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
361 /*
362 * Free the new space.
363 */
364 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
365 be32_to_cpu(agf->agf_length) - new), new);
366 if (error) {
367 goto error0;
368 }
369 }
370
371 /*
372 * Update changed superblock fields transactionally. These are not
373 * seen by the rest of the world until the transaction commit applies
374 * them atomically to the superblock.
375 */
376 if (nagcount > oagcount)
377 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
378 if (nb > mp->m_sb.sb_dblocks)
379 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
380 nb - mp->m_sb.sb_dblocks);
381 if (nfree)
382 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
383 if (dpct)
384 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
385 error = xfs_trans_commit(tp, 0);
386 if (error)
387 return error;
388
389 /* New allocation groups fully initialized, so update mount struct */
390 if (nagimax)
391 mp->m_maxagi = nagimax;
392 if (mp->m_sb.sb_imax_pct) {
393 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
394 do_div(icount, 100);
395 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
396 } else
397 mp->m_maxicount = 0;
398 xfs_set_low_space_thresholds(mp);
399
400 /* update secondary superblocks. */
401 for (agno = 1; agno < nagcount; agno++) {
402 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
403 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
404 XFS_FSS_TO_BB(mp, 1), 0, &bp);
405 if (error) {
406 xfs_warn(mp,
407 "error %d reading secondary superblock for ag %d",
408 error, agno);
409 break;
410 }
411 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
412 /*
413 * If we get an error writing out the alternate superblocks,
414 * just issue a warning and continue. The real work is
415 * already done and committed.
416 */
417 error = xfs_bwrite(bp);
418 xfs_buf_relse(bp);
419 if (error) {
420 xfs_warn(mp,
421 "write error %d updating secondary superblock for ag %d",
422 error, agno);
423 break; /* no point in continuing */
424 }
425 }
426 return 0;
427
428 error0:
429 xfs_trans_cancel(tp, XFS_TRANS_ABORT);
430 return error;
431}
432
433static int
434xfs_growfs_log_private(
435 xfs_mount_t *mp, /* mount point for filesystem */
436 xfs_growfs_log_t *in) /* growfs log input struct */
437{
438 xfs_extlen_t nb;
439
440 nb = in->newblocks;
441 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
442 return XFS_ERROR(EINVAL);
443 if (nb == mp->m_sb.sb_logblocks &&
444 in->isint == (mp->m_sb.sb_logstart != 0))
445 return XFS_ERROR(EINVAL);
446 /*
447 * Moving the log is hard, need new interfaces to sync
448 * the log first, hold off all activity while moving it.
449 * Can have shorter or longer log in the same space,
450 * or transform internal to external log or vice versa.
451 */
452 return XFS_ERROR(ENOSYS);
453}
454
455/*
456 * protected versions of growfs function acquire and release locks on the mount
457 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
458 * XFS_IOC_FSGROWFSRT
459 */
460
461
462int
463xfs_growfs_data(
464 xfs_mount_t *mp,
465 xfs_growfs_data_t *in)
466{
467 int error;
468
469 if (!capable(CAP_SYS_ADMIN))
470 return XFS_ERROR(EPERM);
471 if (!mutex_trylock(&mp->m_growlock))
472 return XFS_ERROR(EWOULDBLOCK);
473 error = xfs_growfs_data_private(mp, in);
474 mutex_unlock(&mp->m_growlock);
475 return error;
476}
477
478int
479xfs_growfs_log(
480 xfs_mount_t *mp,
481 xfs_growfs_log_t *in)
482{
483 int error;
484
485 if (!capable(CAP_SYS_ADMIN))
486 return XFS_ERROR(EPERM);
487 if (!mutex_trylock(&mp->m_growlock))
488 return XFS_ERROR(EWOULDBLOCK);
489 error = xfs_growfs_log_private(mp, in);
490 mutex_unlock(&mp->m_growlock);
491 return error;
492}
493
494/*
495 * exported through ioctl XFS_IOC_FSCOUNTS
496 */
497
498int
499xfs_fs_counts(
500 xfs_mount_t *mp,
501 xfs_fsop_counts_t *cnt)
502{
503 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
504 spin_lock(&mp->m_sb_lock);
505 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
506 cnt->freertx = mp->m_sb.sb_frextents;
507 cnt->freeino = mp->m_sb.sb_ifree;
508 cnt->allocino = mp->m_sb.sb_icount;
509 spin_unlock(&mp->m_sb_lock);
510 return 0;
511}
512
513/*
514 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
515 *
516 * xfs_reserve_blocks is called to set m_resblks
517 * in the in-core mount table. The number of unused reserved blocks
518 * is kept in m_resblks_avail.
519 *
520 * Reserve the requested number of blocks if available. Otherwise return
521 * as many as possible to satisfy the request. The actual number
522 * reserved are returned in outval
523 *
524 * A null inval pointer indicates that only the current reserved blocks
525 * available should be returned no settings are changed.
526 */
527
528int
529xfs_reserve_blocks(
530 xfs_mount_t *mp,
531 __uint64_t *inval,
532 xfs_fsop_resblks_t *outval)
533{
534 __int64_t lcounter, delta, fdblks_delta;
535 __uint64_t request;
536
537 /* If inval is null, report current values and return */
538 if (inval == (__uint64_t *)NULL) {
539 if (!outval)
540 return EINVAL;
541 outval->resblks = mp->m_resblks;
542 outval->resblks_avail = mp->m_resblks_avail;
543 return 0;
544 }
545
546 request = *inval;
547
548 /*
549 * With per-cpu counters, this becomes an interesting
550 * problem. we needto work out if we are freeing or allocation
551 * blocks first, then we can do the modification as necessary.
552 *
553 * We do this under the m_sb_lock so that if we are near
554 * ENOSPC, we will hold out any changes while we work out
555 * what to do. This means that the amount of free space can
556 * change while we do this, so we need to retry if we end up
557 * trying to reserve more space than is available.
558 *
559 * We also use the xfs_mod_incore_sb() interface so that we
560 * don't have to care about whether per cpu counter are
561 * enabled, disabled or even compiled in....
562 */
563retry:
564 spin_lock(&mp->m_sb_lock);
565 xfs_icsb_sync_counters_locked(mp, 0);
566
567 /*
568 * If our previous reservation was larger than the current value,
569 * then move any unused blocks back to the free pool.
570 */
571 fdblks_delta = 0;
572 if (mp->m_resblks > request) {
573 lcounter = mp->m_resblks_avail - request;
574 if (lcounter > 0) { /* release unused blocks */
575 fdblks_delta = lcounter;
576 mp->m_resblks_avail -= lcounter;
577 }
578 mp->m_resblks = request;
579 } else {
580 __int64_t free;
581
582 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
583 if (!free)
584 goto out; /* ENOSPC and fdblks_delta = 0 */
585
586 delta = request - mp->m_resblks;
587 lcounter = free - delta;
588 if (lcounter < 0) {
589 /* We can't satisfy the request, just get what we can */
590 mp->m_resblks += free;
591 mp->m_resblks_avail += free;
592 fdblks_delta = -free;
593 } else {
594 fdblks_delta = -delta;
595 mp->m_resblks = request;
596 mp->m_resblks_avail += delta;
597 }
598 }
599out:
600 if (outval) {
601 outval->resblks = mp->m_resblks;
602 outval->resblks_avail = mp->m_resblks_avail;
603 }
604 spin_unlock(&mp->m_sb_lock);
605
606 if (fdblks_delta) {
607 /*
608 * If we are putting blocks back here, m_resblks_avail is
609 * already at its max so this will put it in the free pool.
610 *
611 * If we need space, we'll either succeed in getting it
612 * from the free block count or we'll get an enospc. If
613 * we get a ENOSPC, it means things changed while we were
614 * calculating fdblks_delta and so we should try again to
615 * see if there is anything left to reserve.
616 *
617 * Don't set the reserved flag here - we don't want to reserve
618 * the extra reserve blocks from the reserve.....
619 */
620 int error;
621 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
622 fdblks_delta, 0);
623 if (error == ENOSPC)
624 goto retry;
625 }
626 return 0;
627}
628
629/*
630 * Dump a transaction into the log that contains no real change. This is needed
631 * to be able to make the log dirty or stamp the current tail LSN into the log
632 * during the covering operation.
633 *
634 * We cannot use an inode here for this - that will push dirty state back up
635 * into the VFS and then periodic inode flushing will prevent log covering from
636 * making progress. Hence we log a field in the superblock instead and use a
637 * synchronous transaction to ensure the superblock is immediately unpinned
638 * and can be written back.
639 */
640int
641xfs_fs_log_dummy(
642 xfs_mount_t *mp)
643{
644 xfs_trans_t *tp;
645 int error;
646
647 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
648 error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
649 XFS_DEFAULT_LOG_COUNT);
650 if (error) {
651 xfs_trans_cancel(tp, 0);
652 return error;
653 }
654
655 /* log the UUID because it is an unchanging field */
656 xfs_mod_sb(tp, XFS_SB_UUID);
657 xfs_trans_set_sync(tp);
658 return xfs_trans_commit(tp, 0);
659}
660
661int
662xfs_fs_goingdown(
663 xfs_mount_t *mp,
664 __uint32_t inflags)
665{
666 switch (inflags) {
667 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
668 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
669
670 if (sb && !IS_ERR(sb)) {
671 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
672 thaw_bdev(sb->s_bdev, sb);
673 }
674
675 break;
676 }
677 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
678 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
679 break;
680 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
681 xfs_force_shutdown(mp,
682 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
683 break;
684 default:
685 return XFS_ERROR(EINVAL);
686 }
687
688 return 0;
689}
690
691/*
692 * Force a shutdown of the filesystem instantly while keeping the filesystem
693 * consistent. We don't do an unmount here; just shutdown the shop, make sure
694 * that absolutely nothing persistent happens to this filesystem after this
695 * point.
696 */
697void
698xfs_do_force_shutdown(
699 xfs_mount_t *mp,
700 int flags,
701 char *fname,
702 int lnnum)
703{
704 int logerror;
705
706 logerror = flags & SHUTDOWN_LOG_IO_ERROR;
707
708 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
709 xfs_notice(mp,
710 "%s(0x%x) called from line %d of file %s. Return address = 0x%p",
711 __func__, flags, lnnum, fname, __return_address);
712 }
713 /*
714 * No need to duplicate efforts.
715 */
716 if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
717 return;
718
719 /*
720 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
721 * queue up anybody new on the log reservations, and wakes up
722 * everybody who's sleeping on log reservations to tell them
723 * the bad news.
724 */
725 if (xfs_log_force_umount(mp, logerror))
726 return;
727
728 if (flags & SHUTDOWN_CORRUPT_INCORE) {
729 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
730 "Corruption of in-memory data detected. Shutting down filesystem");
731 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
732 xfs_stack_trace();
733 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
734 if (logerror) {
735 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
736 "Log I/O Error Detected. Shutting down filesystem");
737 } else if (flags & SHUTDOWN_DEVICE_REQ) {
738 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
739 "All device paths lost. Shutting down filesystem");
740 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
741 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
742 "I/O Error Detected. Shutting down filesystem");
743 }
744 }
745 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
746 xfs_alert(mp,
747 "Please umount the filesystem and rectify the problem(s)");
748 }
749}