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ccwgroup: move attributes to attribute group
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / xfs / xfs_fsops.c
blob785b2a2016e5cba9e787ee5844c52a79d2a5b090
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_dir2.h"
28 #include "xfs_dmapi.h"
29 #include "xfs_mount.h"
30 #include "xfs_bmap_btree.h"
31 #include "xfs_alloc_btree.h"
32 #include "xfs_ialloc_btree.h"
33 #include "xfs_dir2_sf.h"
34 #include "xfs_attr_sf.h"
35 #include "xfs_dinode.h"
36 #include "xfs_inode.h"
37 #include "xfs_inode_item.h"
38 #include "xfs_btree.h"
39 #include "xfs_error.h"
40 #include "xfs_alloc.h"
41 #include "xfs_ialloc.h"
42 #include "xfs_fsops.h"
43 #include "xfs_itable.h"
44 #include "xfs_trans_space.h"
45 #include "xfs_rtalloc.h"
46 #include "xfs_rw.h"
47 #include "xfs_filestream.h"
48
49 /*
50 * File system operations
51 */
52
53 int
54 xfs_fs_geometry(
55 xfs_mount_t *mp,
56 xfs_fsop_geom_t *geo,
57 int new_version)
58 {
59
60 memset(geo, 0, sizeof(*geo));
61
62 geo->blocksize = mp->m_sb.sb_blocksize;
63 geo->rtextsize = mp->m_sb.sb_rextsize;
64 geo->agblocks = mp->m_sb.sb_agblocks;
65 geo->agcount = mp->m_sb.sb_agcount;
66 geo->logblocks = mp->m_sb.sb_logblocks;
67 geo->sectsize = mp->m_sb.sb_sectsize;
68 geo->inodesize = mp->m_sb.sb_inodesize;
69 geo->imaxpct = mp->m_sb.sb_imax_pct;
70 geo->datablocks = mp->m_sb.sb_dblocks;
71 geo->rtblocks = mp->m_sb.sb_rblocks;
72 geo->rtextents = mp->m_sb.sb_rextents;
73 geo->logstart = mp->m_sb.sb_logstart;
74 ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
75 memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
76 if (new_version >= 2) {
77 geo->sunit = mp->m_sb.sb_unit;
78 geo->swidth = mp->m_sb.sb_width;
79 }
80 if (new_version >= 3) {
81 geo->version = XFS_FSOP_GEOM_VERSION;
82 geo->flags =
83 (xfs_sb_version_hasattr(&mp->m_sb) ?
84 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
85 (xfs_sb_version_hasnlink(&mp->m_sb) ?
86 XFS_FSOP_GEOM_FLAGS_NLINK : 0) |
87 (xfs_sb_version_hasquota(&mp->m_sb) ?
88 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
89 (xfs_sb_version_hasalign(&mp->m_sb) ?
90 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
91 (xfs_sb_version_hasdalign(&mp->m_sb) ?
92 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
93 (xfs_sb_version_hasshared(&mp->m_sb) ?
94 XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
95 (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
96 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
97 (xfs_sb_version_hasdirv2(&mp->m_sb) ?
98 XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) |
99 (xfs_sb_version_hassector(&mp->m_sb) ?
100 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
101 (xfs_sb_version_hasasciici(&mp->m_sb) ?
102 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
103 (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
104 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
105 (xfs_sb_version_hasattr2(&mp->m_sb) ?
106 XFS_FSOP_GEOM_FLAGS_ATTR2 : 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_dirblksize;
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 int
122 xfs_growfs_data_private(
123 xfs_mount_t *mp, /* mount point for filesystem */
124 xfs_growfs_data_t *in) /* growfs data input struct */
125 {
126 xfs_agf_t *agf;
127 xfs_agi_t *agi;
128 xfs_agnumber_t agno;
129 xfs_extlen_t agsize;
130 xfs_extlen_t tmpsize;
131 xfs_alloc_rec_t *arec;
132 struct xfs_btree_block *block;
133 xfs_buf_t *bp;
134 int bucket;
135 int dpct;
136 int error;
137 xfs_agnumber_t nagcount;
138 xfs_agnumber_t nagimax = 0;
139 xfs_rfsblock_t nb, nb_mod;
140 xfs_rfsblock_t new;
141 xfs_rfsblock_t nfree;
142 xfs_agnumber_t oagcount;
143 int pct;
144 xfs_trans_t *tp;
145
146 nb = in->newblocks;
147 pct = in->imaxpct;
148 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
149 return XFS_ERROR(EINVAL);
150 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
151 return error;
152 dpct = pct - mp->m_sb.sb_imax_pct;
153 error = xfs_read_buf(mp, mp->m_ddev_targp,
154 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
155 XFS_FSS_TO_BB(mp, 1), 0, &bp);
156 if (error)
157 return error;
158 ASSERT(bp);
159 xfs_buf_relse(bp);
160
161 new = nb; /* use new as a temporary here */
162 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
163 nagcount = new + (nb_mod != 0);
164 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
165 nagcount--;
166 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
167 if (nb < mp->m_sb.sb_dblocks)
168 return XFS_ERROR(EINVAL);
169 }
170 new = nb - mp->m_sb.sb_dblocks;
171 oagcount = mp->m_sb.sb_agcount;
172 if (nagcount > oagcount) {
173 void *new_perag, *old_perag;
174
175 xfs_filestream_flush(mp);
176
177 new_perag = kmem_zalloc(sizeof(xfs_perag_t) * nagcount,
178 KM_MAYFAIL);
179 if (!new_perag)
180 return XFS_ERROR(ENOMEM);
181
182 down_write(&mp->m_peraglock);
183 memcpy(new_perag, mp->m_perag, sizeof(xfs_perag_t) * oagcount);
184 old_perag = mp->m_perag;
185 mp->m_perag = new_perag;
186
187 mp->m_flags |= XFS_MOUNT_32BITINODES;
188 nagimax = xfs_initialize_perag(mp, nagcount);
189 up_write(&mp->m_peraglock);
190
191 kmem_free(old_perag);
192 }
193 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
194 tp->t_flags |= XFS_TRANS_RESERVE;
195 if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
196 XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
197 xfs_trans_cancel(tp, 0);
198 return error;
199 }
200
201 nfree = 0;
202 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
203 /*
204 * AG freelist header block
205 */
206 bp = xfs_buf_get(mp->m_ddev_targp,
207 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
208 XFS_FSS_TO_BB(mp, 1), 0);
209 agf = XFS_BUF_TO_AGF(bp);
210 memset(agf, 0, mp->m_sb.sb_sectsize);
211 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
212 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
213 agf->agf_seqno = cpu_to_be32(agno);
214 if (agno == nagcount - 1)
215 agsize =
216 nb -
217 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
218 else
219 agsize = mp->m_sb.sb_agblocks;
220 agf->agf_length = cpu_to_be32(agsize);
221 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
222 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
223 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
224 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
225 agf->agf_flfirst = 0;
226 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
227 agf->agf_flcount = 0;
228 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
229 agf->agf_freeblks = cpu_to_be32(tmpsize);
230 agf->agf_longest = cpu_to_be32(tmpsize);
231 error = xfs_bwrite(mp, bp);
232 if (error) {
233 goto error0;
234 }
235 /*
236 * AG inode header block
237 */
238 bp = xfs_buf_get(mp->m_ddev_targp,
239 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
240 XFS_FSS_TO_BB(mp, 1), 0);
241 agi = XFS_BUF_TO_AGI(bp);
242 memset(agi, 0, mp->m_sb.sb_sectsize);
243 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
244 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
245 agi->agi_seqno = cpu_to_be32(agno);
246 agi->agi_length = cpu_to_be32(agsize);
247 agi->agi_count = 0;
248 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
249 agi->agi_level = cpu_to_be32(1);
250 agi->agi_freecount = 0;
251 agi->agi_newino = cpu_to_be32(NULLAGINO);
252 agi->agi_dirino = cpu_to_be32(NULLAGINO);
253 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
254 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
255 error = xfs_bwrite(mp, bp);
256 if (error) {
257 goto error0;
258 }
259 /*
260 * BNO btree root block
261 */
262 bp = xfs_buf_get(mp->m_ddev_targp,
263 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
264 BTOBB(mp->m_sb.sb_blocksize), 0);
265 block = XFS_BUF_TO_BLOCK(bp);
266 memset(block, 0, mp->m_sb.sb_blocksize);
267 block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC);
268 block->bb_level = 0;
269 block->bb_numrecs = cpu_to_be16(1);
270 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
271 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
272 arec = XFS_ALLOC_REC_ADDR(mp, block, 1);
273 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
274 arec->ar_blockcount = cpu_to_be32(
275 agsize - be32_to_cpu(arec->ar_startblock));
276 error = xfs_bwrite(mp, 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 block = XFS_BUF_TO_BLOCK(bp);
287 memset(block, 0, mp->m_sb.sb_blocksize);
288 block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC);
289 block->bb_level = 0;
290 block->bb_numrecs = cpu_to_be16(1);
291 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
292 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
293 arec = XFS_ALLOC_REC_ADDR(mp, block, 1);
294 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
295 arec->ar_blockcount = cpu_to_be32(
296 agsize - be32_to_cpu(arec->ar_startblock));
297 nfree += be32_to_cpu(arec->ar_blockcount);
298 error = xfs_bwrite(mp, bp);
299 if (error) {
300 goto error0;
301 }
302 /*
303 * INO btree root block
304 */
305 bp = xfs_buf_get(mp->m_ddev_targp,
306 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
307 BTOBB(mp->m_sb.sb_blocksize), 0);
308 block = XFS_BUF_TO_BLOCK(bp);
309 memset(block, 0, mp->m_sb.sb_blocksize);
310 block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC);
311 block->bb_level = 0;
312 block->bb_numrecs = 0;
313 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
314 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
315 error = xfs_bwrite(mp, bp);
316 if (error) {
317 goto error0;
318 }
319 }
320 xfs_trans_agblocks_delta(tp, nfree);
321 /*
322 * There are new blocks in the old last a.g.
323 */
324 if (new) {
325 /*
326 * Change the agi length.
327 */
328 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
329 if (error) {
330 goto error0;
331 }
332 ASSERT(bp);
333 agi = XFS_BUF_TO_AGI(bp);
334 be32_add_cpu(&agi->agi_length, new);
335 ASSERT(nagcount == oagcount ||
336 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
337 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
338 /*
339 * Change agf length.
340 */
341 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
342 if (error) {
343 goto error0;
344 }
345 ASSERT(bp);
346 agf = XFS_BUF_TO_AGF(bp);
347 be32_add_cpu(&agf->agf_length, new);
348 ASSERT(be32_to_cpu(agf->agf_length) ==
349 be32_to_cpu(agi->agi_length));
350 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
351 /*
352 * Free the new space.
353 */
354 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
355 be32_to_cpu(agf->agf_length) - new), new);
356 if (error) {
357 goto error0;
358 }
359 }
360 if (nagcount > oagcount)
361 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
362 if (nb > mp->m_sb.sb_dblocks)
363 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
364 nb - mp->m_sb.sb_dblocks);
365 if (nfree)
366 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
367 if (dpct)
368 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
369 error = xfs_trans_commit(tp, 0);
370 if (error) {
371 return error;
372 }
373 /* New allocation groups fully initialized, so update mount struct */
374 if (nagimax)
375 mp->m_maxagi = nagimax;
376 if (mp->m_sb.sb_imax_pct) {
377 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
378 do_div(icount, 100);
379 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
380 } else
381 mp->m_maxicount = 0;
382 for (agno = 1; agno < nagcount; agno++) {
383 error = xfs_read_buf(mp, mp->m_ddev_targp,
384 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
385 XFS_FSS_TO_BB(mp, 1), 0, &bp);
386 if (error) {
387 xfs_fs_cmn_err(CE_WARN, mp,
388 "error %d reading secondary superblock for ag %d",
389 error, agno);
390 break;
391 }
392 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
393 /*
394 * If we get an error writing out the alternate superblocks,
395 * just issue a warning and continue. The real work is
396 * already done and committed.
397 */
398 if (!(error = xfs_bwrite(mp, bp))) {
399 continue;
400 } else {
401 xfs_fs_cmn_err(CE_WARN, mp,
402 "write error %d updating secondary superblock for ag %d",
403 error, agno);
404 break; /* no point in continuing */
405 }
406 }
407 return 0;
408
409 error0:
410 xfs_trans_cancel(tp, XFS_TRANS_ABORT);
411 return error;
412 }
413
414 static int
415 xfs_growfs_log_private(
416 xfs_mount_t *mp, /* mount point for filesystem */
417 xfs_growfs_log_t *in) /* growfs log input struct */
418 {
419 xfs_extlen_t nb;
420
421 nb = in->newblocks;
422 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
423 return XFS_ERROR(EINVAL);
424 if (nb == mp->m_sb.sb_logblocks &&
425 in->isint == (mp->m_sb.sb_logstart != 0))
426 return XFS_ERROR(EINVAL);
427 /*
428 * Moving the log is hard, need new interfaces to sync
429 * the log first, hold off all activity while moving it.
430 * Can have shorter or longer log in the same space,
431 * or transform internal to external log or vice versa.
432 */
433 return XFS_ERROR(ENOSYS);
434 }
435
436 /*
437 * protected versions of growfs function acquire and release locks on the mount
438 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
439 * XFS_IOC_FSGROWFSRT
440 */
441
442
443 int
444 xfs_growfs_data(
445 xfs_mount_t *mp,
446 xfs_growfs_data_t *in)
447 {
448 int error;
449
450 if (!capable(CAP_SYS_ADMIN))
451 return XFS_ERROR(EPERM);
452 if (!mutex_trylock(&mp->m_growlock))
453 return XFS_ERROR(EWOULDBLOCK);
454 error = xfs_growfs_data_private(mp, in);
455 mutex_unlock(&mp->m_growlock);
456 return error;
457 }
458
459 int
460 xfs_growfs_log(
461 xfs_mount_t *mp,
462 xfs_growfs_log_t *in)
463 {
464 int error;
465
466 if (!capable(CAP_SYS_ADMIN))
467 return XFS_ERROR(EPERM);
468 if (!mutex_trylock(&mp->m_growlock))
469 return XFS_ERROR(EWOULDBLOCK);
470 error = xfs_growfs_log_private(mp, in);
471 mutex_unlock(&mp->m_growlock);
472 return error;
473 }
474
475 /*
476 * exported through ioctl XFS_IOC_FSCOUNTS
477 */
478
479 int
480 xfs_fs_counts(
481 xfs_mount_t *mp,
482 xfs_fsop_counts_t *cnt)
483 {
484 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
485 spin_lock(&mp->m_sb_lock);
486 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
487 cnt->freertx = mp->m_sb.sb_frextents;
488 cnt->freeino = mp->m_sb.sb_ifree;
489 cnt->allocino = mp->m_sb.sb_icount;
490 spin_unlock(&mp->m_sb_lock);
491 return 0;
492 }
493
494 /*
495 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
496 *
497 * xfs_reserve_blocks is called to set m_resblks
498 * in the in-core mount table. The number of unused reserved blocks
499 * is kept in m_resblks_avail.
500 *
501 * Reserve the requested number of blocks if available. Otherwise return
502 * as many as possible to satisfy the request. The actual number
503 * reserved are returned in outval
504 *
505 * A null inval pointer indicates that only the current reserved blocks
506 * available should be returned no settings are changed.
507 */
508
509 int
510 xfs_reserve_blocks(
511 xfs_mount_t *mp,
512 __uint64_t *inval,
513 xfs_fsop_resblks_t *outval)
514 {
515 __int64_t lcounter, delta, fdblks_delta;
516 __uint64_t request;
517
518 /* If inval is null, report current values and return */
519 if (inval == (__uint64_t *)NULL) {
520 if (!outval)
521 return EINVAL;
522 outval->resblks = mp->m_resblks;
523 outval->resblks_avail = mp->m_resblks_avail;
524 return 0;
525 }
526
527 request = *inval;
528
529 /*
530 * With per-cpu counters, this becomes an interesting
531 * problem. we needto work out if we are freeing or allocation
532 * blocks first, then we can do the modification as necessary.
533 *
534 * We do this under the m_sb_lock so that if we are near
535 * ENOSPC, we will hold out any changes while we work out
536 * what to do. This means that the amount of free space can
537 * change while we do this, so we need to retry if we end up
538 * trying to reserve more space than is available.
539 *
540 * We also use the xfs_mod_incore_sb() interface so that we
541 * don't have to care about whether per cpu counter are
542 * enabled, disabled or even compiled in....
543 */
544 retry:
545 spin_lock(&mp->m_sb_lock);
546 xfs_icsb_sync_counters_locked(mp, 0);
547
548 /*
549 * If our previous reservation was larger than the current value,
550 * then move any unused blocks back to the free pool.
551 */
552 fdblks_delta = 0;
553 if (mp->m_resblks > request) {
554 lcounter = mp->m_resblks_avail - request;
555 if (lcounter > 0) { /* release unused blocks */
556 fdblks_delta = lcounter;
557 mp->m_resblks_avail -= lcounter;
558 }
559 mp->m_resblks = request;
560 } else {
561 __int64_t free;
562
563 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
564 if (!free)
565 goto out; /* ENOSPC and fdblks_delta = 0 */
566
567 delta = request - mp->m_resblks;
568 lcounter = free - delta;
569 if (lcounter < 0) {
570 /* We can't satisfy the request, just get what we can */
571 mp->m_resblks += free;
572 mp->m_resblks_avail += free;
573 fdblks_delta = -free;
574 } else {
575 fdblks_delta = -delta;
576 mp->m_resblks = request;
577 mp->m_resblks_avail += delta;
578 }
579 }
580 out:
581 if (outval) {
582 outval->resblks = mp->m_resblks;
583 outval->resblks_avail = mp->m_resblks_avail;
584 }
585 spin_unlock(&mp->m_sb_lock);
586
587 if (fdblks_delta) {
588 /*
589 * If we are putting blocks back here, m_resblks_avail is
590 * already at its max so this will put it in the free pool.
591 *
592 * If we need space, we'll either succeed in getting it
593 * from the free block count or we'll get an enospc. If
594 * we get a ENOSPC, it means things changed while we were
595 * calculating fdblks_delta and so we should try again to
596 * see if there is anything left to reserve.
597 *
598 * Don't set the reserved flag here - we don't want to reserve
599 * the extra reserve blocks from the reserve.....
600 */
601 int error;
602 error = xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, fdblks_delta, 0);
603 if (error == ENOSPC)
604 goto retry;
605 }
606 return 0;
607 }
608
609 int
610 xfs_fs_log_dummy(
611 xfs_mount_t *mp)
612 {
613 xfs_trans_t *tp;
614 xfs_inode_t *ip;
615 int error;
616
617 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
618 error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0);
619 if (error) {
620 xfs_trans_cancel(tp, 0);
621 return error;
622 }
623
624 ip = mp->m_rootip;
625 xfs_ilock(ip, XFS_ILOCK_EXCL);
626
627 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
628 xfs_trans_ihold(tp, ip);
629 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
630 xfs_trans_set_sync(tp);
631 error = xfs_trans_commit(tp, 0);
632
633 xfs_iunlock(ip, XFS_ILOCK_EXCL);
634 return error;
635 }
636
637 int
638 xfs_fs_goingdown(
639 xfs_mount_t *mp,
640 __uint32_t inflags)
641 {
642 switch (inflags) {
643 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
644 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
645
646 if (sb && !IS_ERR(sb)) {
647 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
648 thaw_bdev(sb->s_bdev, sb);
649 }
650
651 break;
652 }
653 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
654 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
655 break;
656 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
657 xfs_force_shutdown(mp,
658 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
659 break;
660 default:
661 return XFS_ERROR(EINVAL);
662 }
663
664 return 0;
665 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree