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Fix gcc 4.5.1 miscompiling drivers/char/i8k.c (again)
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / xfs / xfs_fsops.c
blob7c49b068de854b43385cc5ae4d77a544e8ed3e9c
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 #include "xfs_trace.h"
49
50 /*
51 * File system operations
52 */
53
54 int
55 xfs_fs_geometry(
56 xfs_mount_t *mp,
57 xfs_fsop_geom_t *geo,
58 int new_version)
59 {
60
61 memset(geo, 0, sizeof(*geo));
62
63 geo->blocksize = mp->m_sb.sb_blocksize;
64 geo->rtextsize = mp->m_sb.sb_rextsize;
65 geo->agblocks = mp->m_sb.sb_agblocks;
66 geo->agcount = mp->m_sb.sb_agcount;
67 geo->logblocks = mp->m_sb.sb_logblocks;
68 geo->sectsize = mp->m_sb.sb_sectsize;
69 geo->inodesize = mp->m_sb.sb_inodesize;
70 geo->imaxpct = mp->m_sb.sb_imax_pct;
71 geo->datablocks = mp->m_sb.sb_dblocks;
72 geo->rtblocks = mp->m_sb.sb_rblocks;
73 geo->rtextents = mp->m_sb.sb_rextents;
74 geo->logstart = mp->m_sb.sb_logstart;
75 ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
76 memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
77 if (new_version >= 2) {
78 geo->sunit = mp->m_sb.sb_unit;
79 geo->swidth = mp->m_sb.sb_width;
80 }
81 if (new_version >= 3) {
82 geo->version = XFS_FSOP_GEOM_VERSION;
83 geo->flags =
84 (xfs_sb_version_hasattr(&mp->m_sb) ?
85 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
86 (xfs_sb_version_hasnlink(&mp->m_sb) ?
87 XFS_FSOP_GEOM_FLAGS_NLINK : 0) |
88 (xfs_sb_version_hasquota(&mp->m_sb) ?
89 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
90 (xfs_sb_version_hasalign(&mp->m_sb) ?
91 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
92 (xfs_sb_version_hasdalign(&mp->m_sb) ?
93 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
94 (xfs_sb_version_hasshared(&mp->m_sb) ?
95 XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
96 (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
97 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
98 (xfs_sb_version_hasdirv2(&mp->m_sb) ?
99 XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) |
100 (xfs_sb_version_hassector(&mp->m_sb) ?
101 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
102 (xfs_sb_version_hasasciici(&mp->m_sb) ?
103 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
104 (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
105 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
106 (xfs_sb_version_hasattr2(&mp->m_sb) ?
107 XFS_FSOP_GEOM_FLAGS_ATTR2 : 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_dirblksize;
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
122 static int
123 xfs_growfs_data_private(
124 xfs_mount_t *mp, /* mount point for filesystem */
125 xfs_growfs_data_t *in) /* growfs data input struct */
126 {
127 xfs_agf_t *agf;
128 xfs_agi_t *agi;
129 xfs_agnumber_t agno;
130 xfs_extlen_t agsize;
131 xfs_extlen_t tmpsize;
132 xfs_alloc_rec_t *arec;
133 struct xfs_btree_block *block;
134 xfs_buf_t *bp;
135 int bucket;
136 int dpct;
137 int error;
138 xfs_agnumber_t nagcount;
139 xfs_agnumber_t nagimax = 0;
140 xfs_rfsblock_t nb, nb_mod;
141 xfs_rfsblock_t new;
142 xfs_rfsblock_t nfree;
143 xfs_agnumber_t oagcount;
144 int pct;
145 xfs_trans_t *tp;
146
147 nb = in->newblocks;
148 pct = in->imaxpct;
149 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
150 return XFS_ERROR(EINVAL);
151 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
152 return error;
153 dpct = pct - mp->m_sb.sb_imax_pct;
154 error = xfs_read_buf(mp, mp->m_ddev_targp,
155 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
156 XFS_FSS_TO_BB(mp, 1), 0, &bp);
157 if (error)
158 return error;
159 ASSERT(bp);
160 xfs_buf_relse(bp);
161
162 new = nb; /* use new as a temporary here */
163 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
164 nagcount = new + (nb_mod != 0);
165 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
166 nagcount--;
167 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
168 if (nb < mp->m_sb.sb_dblocks)
169 return XFS_ERROR(EINVAL);
170 }
171 new = nb - mp->m_sb.sb_dblocks;
172 oagcount = mp->m_sb.sb_agcount;
173 if (nagcount > oagcount) {
174 void *new_perag, *old_perag;
175
176 xfs_filestream_flush(mp);
177
178 new_perag = kmem_zalloc(sizeof(xfs_perag_t) * nagcount,
179 KM_MAYFAIL);
180 if (!new_perag)
181 return XFS_ERROR(ENOMEM);
182
183 down_write(&mp->m_peraglock);
184 memcpy(new_perag, mp->m_perag, sizeof(xfs_perag_t) * oagcount);
185 old_perag = mp->m_perag;
186 mp->m_perag = new_perag;
187
188 mp->m_flags |= XFS_MOUNT_32BITINODES;
189 nagimax = xfs_initialize_perag(mp, nagcount);
190 up_write(&mp->m_peraglock);
191
192 kmem_free(old_perag);
193 }
194 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
195 tp->t_flags |= XFS_TRANS_RESERVE;
196 if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
197 XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
198 xfs_trans_cancel(tp, 0);
199 return error;
200 }
201
202 nfree = 0;
203 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
204 /*
205 * AG freelist header block
206 */
207 bp = xfs_buf_get(mp->m_ddev_targp,
208 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
209 XFS_FSS_TO_BB(mp, 1), XBF_LOCK | XBF_MAPPED);
210 agf = XFS_BUF_TO_AGF(bp);
211 memset(agf, 0, mp->m_sb.sb_sectsize);
212 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
213 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
214 agf->agf_seqno = cpu_to_be32(agno);
215 if (agno == nagcount - 1)
216 agsize =
217 nb -
218 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
219 else
220 agsize = mp->m_sb.sb_agblocks;
221 agf->agf_length = cpu_to_be32(agsize);
222 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
223 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
224 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
225 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
226 agf->agf_flfirst = 0;
227 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
228 agf->agf_flcount = 0;
229 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
230 agf->agf_freeblks = cpu_to_be32(tmpsize);
231 agf->agf_longest = cpu_to_be32(tmpsize);
232 error = xfs_bwrite(mp, bp);
233 if (error) {
234 goto error0;
235 }
236 /*
237 * AG inode header block
238 */
239 bp = xfs_buf_get(mp->m_ddev_targp,
240 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
241 XFS_FSS_TO_BB(mp, 1), XBF_LOCK | XBF_MAPPED);
242 agi = XFS_BUF_TO_AGI(bp);
243 memset(agi, 0, mp->m_sb.sb_sectsize);
244 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
245 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
246 agi->agi_seqno = cpu_to_be32(agno);
247 agi->agi_length = cpu_to_be32(agsize);
248 agi->agi_count = 0;
249 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
250 agi->agi_level = cpu_to_be32(1);
251 agi->agi_freecount = 0;
252 agi->agi_newino = cpu_to_be32(NULLAGINO);
253 agi->agi_dirino = cpu_to_be32(NULLAGINO);
254 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
255 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
256 error = xfs_bwrite(mp, bp);
257 if (error) {
258 goto error0;
259 }
260 /*
261 * BNO btree root block
262 */
263 bp = xfs_buf_get(mp->m_ddev_targp,
264 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
265 BTOBB(mp->m_sb.sb_blocksize),
266 XBF_LOCK | XBF_MAPPED);
267 block = XFS_BUF_TO_BLOCK(bp);
268 memset(block, 0, mp->m_sb.sb_blocksize);
269 block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC);
270 block->bb_level = 0;
271 block->bb_numrecs = cpu_to_be16(1);
272 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
273 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
274 arec = XFS_ALLOC_REC_ADDR(mp, block, 1);
275 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
276 arec->ar_blockcount = cpu_to_be32(
277 agsize - be32_to_cpu(arec->ar_startblock));
278 error = xfs_bwrite(mp, bp);
279 if (error) {
280 goto error0;
281 }
282 /*
283 * CNT btree root block
284 */
285 bp = xfs_buf_get(mp->m_ddev_targp,
286 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
287 BTOBB(mp->m_sb.sb_blocksize),
288 XBF_LOCK | XBF_MAPPED);
289 block = XFS_BUF_TO_BLOCK(bp);
290 memset(block, 0, mp->m_sb.sb_blocksize);
291 block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC);
292 block->bb_level = 0;
293 block->bb_numrecs = cpu_to_be16(1);
294 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
295 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
296 arec = XFS_ALLOC_REC_ADDR(mp, block, 1);
297 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
298 arec->ar_blockcount = cpu_to_be32(
299 agsize - be32_to_cpu(arec->ar_startblock));
300 nfree += be32_to_cpu(arec->ar_blockcount);
301 error = xfs_bwrite(mp, bp);
302 if (error) {
303 goto error0;
304 }
305 /*
306 * INO btree root block
307 */
308 bp = xfs_buf_get(mp->m_ddev_targp,
309 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
310 BTOBB(mp->m_sb.sb_blocksize),
311 XBF_LOCK | XBF_MAPPED);
312 block = XFS_BUF_TO_BLOCK(bp);
313 memset(block, 0, mp->m_sb.sb_blocksize);
314 block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC);
315 block->bb_level = 0;
316 block->bb_numrecs = 0;
317 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
318 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
319 error = xfs_bwrite(mp, bp);
320 if (error) {
321 goto error0;
322 }
323 }
324 xfs_trans_agblocks_delta(tp, nfree);
325 /*
326 * There are new blocks in the old last a.g.
327 */
328 if (new) {
329 /*
330 * Change the agi length.
331 */
332 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
333 if (error) {
334 goto error0;
335 }
336 ASSERT(bp);
337 agi = XFS_BUF_TO_AGI(bp);
338 be32_add_cpu(&agi->agi_length, new);
339 ASSERT(nagcount == oagcount ||
340 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
341 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
342 /*
343 * Change agf length.
344 */
345 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
346 if (error) {
347 goto error0;
348 }
349 ASSERT(bp);
350 agf = XFS_BUF_TO_AGF(bp);
351 be32_add_cpu(&agf->agf_length, new);
352 ASSERT(be32_to_cpu(agf->agf_length) ==
353 be32_to_cpu(agi->agi_length));
354
355 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
356 /*
357 * Free the new space.
358 */
359 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
360 be32_to_cpu(agf->agf_length) - new), new);
361 if (error) {
362 goto error0;
363 }
364 }
365 if (nagcount > oagcount)
366 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
367 if (nb > mp->m_sb.sb_dblocks)
368 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
369 nb - mp->m_sb.sb_dblocks);
370 if (nfree)
371 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
372 if (dpct)
373 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
374 error = xfs_trans_commit(tp, 0);
375 if (error) {
376 return error;
377 }
378 /* New allocation groups fully initialized, so update mount struct */
379 if (nagimax)
380 mp->m_maxagi = nagimax;
381 if (mp->m_sb.sb_imax_pct) {
382 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
383 do_div(icount, 100);
384 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
385 } else
386 mp->m_maxicount = 0;
387 for (agno = 1; agno < nagcount; agno++) {
388 error = xfs_read_buf(mp, mp->m_ddev_targp,
389 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
390 XFS_FSS_TO_BB(mp, 1), 0, &bp);
391 if (error) {
392 xfs_fs_cmn_err(CE_WARN, mp,
393 "error %d reading secondary superblock for ag %d",
394 error, agno);
395 break;
396 }
397 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
398 /*
399 * If we get an error writing out the alternate superblocks,
400 * just issue a warning and continue. The real work is
401 * already done and committed.
402 */
403 if (!(error = xfs_bwrite(mp, bp))) {
404 continue;
405 } else {
406 xfs_fs_cmn_err(CE_WARN, mp,
407 "write error %d updating secondary superblock for ag %d",
408 error, agno);
409 break; /* no point in continuing */
410 }
411 }
412 return 0;
413
414 error0:
415 xfs_trans_cancel(tp, XFS_TRANS_ABORT);
416 return error;
417 }
418
419 static int
420 xfs_growfs_log_private(
421 xfs_mount_t *mp, /* mount point for filesystem */
422 xfs_growfs_log_t *in) /* growfs log input struct */
423 {
424 xfs_extlen_t nb;
425
426 nb = in->newblocks;
427 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
428 return XFS_ERROR(EINVAL);
429 if (nb == mp->m_sb.sb_logblocks &&
430 in->isint == (mp->m_sb.sb_logstart != 0))
431 return XFS_ERROR(EINVAL);
432 /*
433 * Moving the log is hard, need new interfaces to sync
434 * the log first, hold off all activity while moving it.
435 * Can have shorter or longer log in the same space,
436 * or transform internal to external log or vice versa.
437 */
438 return XFS_ERROR(ENOSYS);
439 }
440
441 /*
442 * protected versions of growfs function acquire and release locks on the mount
443 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
444 * XFS_IOC_FSGROWFSRT
445 */
446
447
448 int
449 xfs_growfs_data(
450 xfs_mount_t *mp,
451 xfs_growfs_data_t *in)
452 {
453 int error;
454
455 if (!capable(CAP_SYS_ADMIN))
456 return XFS_ERROR(EPERM);
457 if (!mutex_trylock(&mp->m_growlock))
458 return XFS_ERROR(EWOULDBLOCK);
459 error = xfs_growfs_data_private(mp, in);
460 mutex_unlock(&mp->m_growlock);
461 return error;
462 }
463
464 int
465 xfs_growfs_log(
466 xfs_mount_t *mp,
467 xfs_growfs_log_t *in)
468 {
469 int error;
470
471 if (!capable(CAP_SYS_ADMIN))
472 return XFS_ERROR(EPERM);
473 if (!mutex_trylock(&mp->m_growlock))
474 return XFS_ERROR(EWOULDBLOCK);
475 error = xfs_growfs_log_private(mp, in);
476 mutex_unlock(&mp->m_growlock);
477 return error;
478 }
479
480 /*
481 * exported through ioctl XFS_IOC_FSCOUNTS
482 */
483
484 int
485 xfs_fs_counts(
486 xfs_mount_t *mp,
487 xfs_fsop_counts_t *cnt)
488 {
489 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
490 spin_lock(&mp->m_sb_lock);
491 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
492 cnt->freertx = mp->m_sb.sb_frextents;
493 cnt->freeino = mp->m_sb.sb_ifree;
494 cnt->allocino = mp->m_sb.sb_icount;
495 spin_unlock(&mp->m_sb_lock);
496 return 0;
497 }
498
499 /*
500 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
501 *
502 * xfs_reserve_blocks is called to set m_resblks
503 * in the in-core mount table. The number of unused reserved blocks
504 * is kept in m_resblks_avail.
505 *
506 * Reserve the requested number of blocks if available. Otherwise return
507 * as many as possible to satisfy the request. The actual number
508 * reserved are returned in outval
509 *
510 * A null inval pointer indicates that only the current reserved blocks
511 * available should be returned no settings are changed.
512 */
513
514 int
515 xfs_reserve_blocks(
516 xfs_mount_t *mp,
517 __uint64_t *inval,
518 xfs_fsop_resblks_t *outval)
519 {
520 __int64_t lcounter, delta, fdblks_delta;
521 __uint64_t request;
522
523 /* If inval is null, report current values and return */
524 if (inval == (__uint64_t *)NULL) {
525 if (!outval)
526 return EINVAL;
527 outval->resblks = mp->m_resblks;
528 outval->resblks_avail = mp->m_resblks_avail;
529 return 0;
530 }
531
532 request = *inval;
533
534 /*
535 * With per-cpu counters, this becomes an interesting
536 * problem. we needto work out if we are freeing or allocation
537 * blocks first, then we can do the modification as necessary.
538 *
539 * We do this under the m_sb_lock so that if we are near
540 * ENOSPC, we will hold out any changes while we work out
541 * what to do. This means that the amount of free space can
542 * change while we do this, so we need to retry if we end up
543 * trying to reserve more space than is available.
544 *
545 * We also use the xfs_mod_incore_sb() interface so that we
546 * don't have to care about whether per cpu counter are
547 * enabled, disabled or even compiled in....
548 */
549 retry:
550 spin_lock(&mp->m_sb_lock);
551 xfs_icsb_sync_counters_locked(mp, 0);
552
553 /*
554 * If our previous reservation was larger than the current value,
555 * then move any unused blocks back to the free pool.
556 */
557 fdblks_delta = 0;
558 if (mp->m_resblks > request) {
559 lcounter = mp->m_resblks_avail - request;
560 if (lcounter > 0) { /* release unused blocks */
561 fdblks_delta = lcounter;
562 mp->m_resblks_avail -= lcounter;
563 }
564 mp->m_resblks = request;
565 } else {
566 __int64_t free;
567
568 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
569 if (!free)
570 goto out; /* ENOSPC and fdblks_delta = 0 */
571
572 delta = request - mp->m_resblks;
573 lcounter = free - delta;
574 if (lcounter < 0) {
575 /* We can't satisfy the request, just get what we can */
576 mp->m_resblks += free;
577 mp->m_resblks_avail += free;
578 fdblks_delta = -free;
579 } else {
580 fdblks_delta = -delta;
581 mp->m_resblks = request;
582 mp->m_resblks_avail += delta;
583 }
584 }
585 out:
586 if (outval) {
587 outval->resblks = mp->m_resblks;
588 outval->resblks_avail = mp->m_resblks_avail;
589 }
590 spin_unlock(&mp->m_sb_lock);
591
592 if (fdblks_delta) {
593 /*
594 * If we are putting blocks back here, m_resblks_avail is
595 * already at its max so this will put it in the free pool.
596 *
597 * If we need space, we'll either succeed in getting it
598 * from the free block count or we'll get an enospc. If
599 * we get a ENOSPC, it means things changed while we were
600 * calculating fdblks_delta and so we should try again to
601 * see if there is anything left to reserve.
602 *
603 * Don't set the reserved flag here - we don't want to reserve
604 * the extra reserve blocks from the reserve.....
605 */
606 int error;
607 error = xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, fdblks_delta, 0);
608 if (error == ENOSPC)
609 goto retry;
610 }
611 return 0;
612 }
613
614 int
615 xfs_fs_log_dummy(
616 xfs_mount_t *mp)
617 {
618 xfs_trans_t *tp;
619 xfs_inode_t *ip;
620 int error;
621
622 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
623 error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0);
624 if (error) {
625 xfs_trans_cancel(tp, 0);
626 return error;
627 }
628
629 ip = mp->m_rootip;
630 xfs_ilock(ip, XFS_ILOCK_EXCL);
631
632 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
633 xfs_trans_ihold(tp, ip);
634 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
635 xfs_trans_set_sync(tp);
636 error = xfs_trans_commit(tp, 0);
637
638 xfs_iunlock(ip, XFS_ILOCK_EXCL);
639 return error;
640 }
641
642 int
643 xfs_fs_goingdown(
644 xfs_mount_t *mp,
645 __uint32_t inflags)
646 {
647 switch (inflags) {
648 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
649 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
650
651 if (sb && !IS_ERR(sb)) {
652 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
653 thaw_bdev(sb->s_bdev, sb);
654 }
655
656 break;
657 }
658 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
659 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
660 break;
661 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
662 xfs_force_shutdown(mp,
663 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
664 break;
665 default:
666 return XFS_ERROR(EINVAL);
667 }
668
669 return 0;
670 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree