?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
allow coexistance of N build and AC build.
[tomato.git] / release / src-rt-6.x / linux / linux-2.6 / fs / xfs / xfs_fsops.c
blobb599e6be9ec18f146f8527c7e361c5dc94f45c30
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
48 /*
49 * File system operations
50 */
51
52 int
53 xfs_fs_geometry(
54 xfs_mount_t *mp,
55 xfs_fsop_geom_t *geo,
56 int new_version)
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 =
79 (XFS_SB_VERSION_HASATTR(&mp->m_sb) ?
80 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
81 (XFS_SB_VERSION_HASNLINK(&mp->m_sb) ?
82 XFS_FSOP_GEOM_FLAGS_NLINK : 0) |
83 (XFS_SB_VERSION_HASQUOTA(&mp->m_sb) ?
84 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
85 (XFS_SB_VERSION_HASALIGN(&mp->m_sb) ?
86 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
87 (XFS_SB_VERSION_HASDALIGN(&mp->m_sb) ?
88 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
89 (XFS_SB_VERSION_HASSHARED(&mp->m_sb) ?
90 XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
91 (XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb) ?
92 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
93 (XFS_SB_VERSION_HASDIRV2(&mp->m_sb) ?
94 XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) |
95 (XFS_SB_VERSION_HASSECTOR(&mp->m_sb) ?
96 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
97 (XFS_SB_VERSION_HASATTR2(&mp->m_sb) ?
98 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0);
99 geo->logsectsize = XFS_SB_VERSION_HASSECTOR(&mp->m_sb) ?
100 mp->m_sb.sb_logsectsize : BBSIZE;
101 geo->rtsectsize = mp->m_sb.sb_blocksize;
102 geo->dirblocksize = mp->m_dirblksize;
103 }
104 if (new_version >= 4) {
105 geo->flags |=
106 (XFS_SB_VERSION_HASLOGV2(&mp->m_sb) ?
107 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
108 geo->logsunit = mp->m_sb.sb_logsunit;
109 }
110 return 0;
111 }
112
113 static int
114 xfs_growfs_data_private(
115 xfs_mount_t *mp, /* mount point for filesystem */
116 xfs_growfs_data_t *in) /* growfs data input struct */
117 {
118 xfs_agf_t *agf;
119 xfs_agi_t *agi;
120 xfs_agnumber_t agno;
121 xfs_extlen_t agsize;
122 xfs_extlen_t tmpsize;
123 xfs_alloc_rec_t *arec;
124 xfs_btree_sblock_t *block;
125 xfs_buf_t *bp;
126 int bucket;
127 int dpct;
128 int error;
129 xfs_agnumber_t nagcount;
130 xfs_agnumber_t nagimax = 0;
131 xfs_rfsblock_t nb, nb_mod;
132 xfs_rfsblock_t new;
133 xfs_rfsblock_t nfree;
134 xfs_agnumber_t oagcount;
135 int pct;
136 xfs_sb_t *sbp;
137 xfs_trans_t *tp;
138
139 nb = in->newblocks;
140 pct = in->imaxpct;
141 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
142 return XFS_ERROR(EINVAL);
143 dpct = pct - mp->m_sb.sb_imax_pct;
144 error = xfs_read_buf(mp, mp->m_ddev_targp,
145 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
146 XFS_FSS_TO_BB(mp, 1), 0, &bp);
147 if (error)
148 return error;
149 ASSERT(bp);
150 xfs_buf_relse(bp);
151
152 new = nb; /* use new as a temporary here */
153 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
154 nagcount = new + (nb_mod != 0);
155 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
156 nagcount--;
157 nb = nagcount * mp->m_sb.sb_agblocks;
158 if (nb < mp->m_sb.sb_dblocks)
159 return XFS_ERROR(EINVAL);
160 }
161 new = nb - mp->m_sb.sb_dblocks;
162 oagcount = mp->m_sb.sb_agcount;
163 if (nagcount > oagcount) {
164 down_write(&mp->m_peraglock);
165 mp->m_perag = kmem_realloc(mp->m_perag,
166 sizeof(xfs_perag_t) * nagcount,
167 sizeof(xfs_perag_t) * oagcount,
168 KM_SLEEP);
169 memset(&mp->m_perag[oagcount], 0,
170 (nagcount - oagcount) * sizeof(xfs_perag_t));
171 mp->m_flags |= XFS_MOUNT_32BITINODES;
172 nagimax = xfs_initialize_perag(XFS_MTOVFS(mp), mp, nagcount);
173 up_write(&mp->m_peraglock);
174 }
175 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
176 if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
177 XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
178 xfs_trans_cancel(tp, 0);
179 return error;
180 }
181
182 nfree = 0;
183 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
184 /*
185 * AG freelist header block
186 */
187 bp = xfs_buf_get(mp->m_ddev_targp,
188 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
189 XFS_FSS_TO_BB(mp, 1), 0);
190 agf = XFS_BUF_TO_AGF(bp);
191 memset(agf, 0, mp->m_sb.sb_sectsize);
192 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
193 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
194 agf->agf_seqno = cpu_to_be32(agno);
195 if (agno == nagcount - 1)
196 agsize =
197 nb -
198 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
199 else
200 agsize = mp->m_sb.sb_agblocks;
201 agf->agf_length = cpu_to_be32(agsize);
202 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
203 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
204 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
205 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
206 agf->agf_flfirst = 0;
207 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
208 agf->agf_flcount = 0;
209 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
210 agf->agf_freeblks = cpu_to_be32(tmpsize);
211 agf->agf_longest = cpu_to_be32(tmpsize);
212 error = xfs_bwrite(mp, bp);
213 if (error) {
214 goto error0;
215 }
216 /*
217 * AG inode header block
218 */
219 bp = xfs_buf_get(mp->m_ddev_targp,
220 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
221 XFS_FSS_TO_BB(mp, 1), 0);
222 agi = XFS_BUF_TO_AGI(bp);
223 memset(agi, 0, mp->m_sb.sb_sectsize);
224 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
225 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
226 agi->agi_seqno = cpu_to_be32(agno);
227 agi->agi_length = cpu_to_be32(agsize);
228 agi->agi_count = 0;
229 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
230 agi->agi_level = cpu_to_be32(1);
231 agi->agi_freecount = 0;
232 agi->agi_newino = cpu_to_be32(NULLAGINO);
233 agi->agi_dirino = cpu_to_be32(NULLAGINO);
234 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
235 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
236 error = xfs_bwrite(mp, bp);
237 if (error) {
238 goto error0;
239 }
240 /*
241 * BNO btree root block
242 */
243 bp = xfs_buf_get(mp->m_ddev_targp,
244 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
245 BTOBB(mp->m_sb.sb_blocksize), 0);
246 block = XFS_BUF_TO_SBLOCK(bp);
247 memset(block, 0, mp->m_sb.sb_blocksize);
248 block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC);
249 block->bb_level = 0;
250 block->bb_numrecs = cpu_to_be16(1);
251 block->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
252 block->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
253 arec = XFS_BTREE_REC_ADDR(xfs_alloc, block, 1);
254 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
255 arec->ar_blockcount = cpu_to_be32(
256 agsize - be32_to_cpu(arec->ar_startblock));
257 error = xfs_bwrite(mp, bp);
258 if (error) {
259 goto error0;
260 }
261 /*
262 * CNT btree root block
263 */
264 bp = xfs_buf_get(mp->m_ddev_targp,
265 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
266 BTOBB(mp->m_sb.sb_blocksize), 0);
267 block = XFS_BUF_TO_SBLOCK(bp);
268 memset(block, 0, mp->m_sb.sb_blocksize);
269 block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC);
270 block->bb_level = 0;
271 block->bb_numrecs = cpu_to_be16(1);
272 block->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
273 block->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
274 arec = XFS_BTREE_REC_ADDR(xfs_alloc, 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 nfree += be32_to_cpu(arec->ar_blockcount);
279 error = xfs_bwrite(mp, bp);
280 if (error) {
281 goto error0;
282 }
283 /*
284 * INO btree root block
285 */
286 bp = xfs_buf_get(mp->m_ddev_targp,
287 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
288 BTOBB(mp->m_sb.sb_blocksize), 0);
289 block = XFS_BUF_TO_SBLOCK(bp);
290 memset(block, 0, mp->m_sb.sb_blocksize);
291 block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC);
292 block->bb_level = 0;
293 block->bb_numrecs = 0;
294 block->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
295 block->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
296 error = xfs_bwrite(mp, bp);
297 if (error) {
298 goto error0;
299 }
300 }
301 xfs_trans_agblocks_delta(tp, nfree);
302 /*
303 * There are new blocks in the old last a.g.
304 */
305 if (new) {
306 /*
307 * Change the agi length.
308 */
309 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
310 if (error) {
311 goto error0;
312 }
313 ASSERT(bp);
314 agi = XFS_BUF_TO_AGI(bp);
315 be32_add(&agi->agi_length, new);
316 ASSERT(nagcount == oagcount ||
317 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
318 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
319 /*
320 * Change agf length.
321 */
322 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
323 if (error) {
324 goto error0;
325 }
326 ASSERT(bp);
327 agf = XFS_BUF_TO_AGF(bp);
328 be32_add(&agf->agf_length, new);
329 ASSERT(be32_to_cpu(agf->agf_length) ==
330 be32_to_cpu(agi->agi_length));
331 /*
332 * Free the new space.
333 */
334 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
335 be32_to_cpu(agf->agf_length) - new), new);
336 if (error) {
337 goto error0;
338 }
339 }
340 if (nagcount > oagcount)
341 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
342 if (nb > mp->m_sb.sb_dblocks)
343 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
344 nb - mp->m_sb.sb_dblocks);
345 if (nfree)
346 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
347 if (dpct)
348 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
349 error = xfs_trans_commit(tp, 0);
350 if (error) {
351 return error;
352 }
353 /* New allocation groups fully initialized, so update mount struct */
354 if (nagimax)
355 mp->m_maxagi = nagimax;
356 if (mp->m_sb.sb_imax_pct) {
357 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
358 do_div(icount, 100);
359 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
360 } else
361 mp->m_maxicount = 0;
362 for (agno = 1; agno < nagcount; agno++) {
363 error = xfs_read_buf(mp, mp->m_ddev_targp,
364 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
365 XFS_FSS_TO_BB(mp, 1), 0, &bp);
366 if (error) {
367 xfs_fs_cmn_err(CE_WARN, mp,
368 "error %d reading secondary superblock for ag %d",
369 error, agno);
370 break;
371 }
372 sbp = XFS_BUF_TO_SBP(bp);
373 xfs_xlatesb(sbp, &mp->m_sb, -1, XFS_SB_ALL_BITS);
374 /*
375 * If we get an error writing out the alternate superblocks,
376 * just issue a warning and continue. The real work is
377 * already done and committed.
378 */
379 if (!(error = xfs_bwrite(mp, bp))) {
380 continue;
381 } else {
382 xfs_fs_cmn_err(CE_WARN, mp,
383 "write error %d updating secondary superblock for ag %d",
384 error, agno);
385 break; /* no point in continuing */
386 }
387 }
388 return 0;
389
390 error0:
391 xfs_trans_cancel(tp, XFS_TRANS_ABORT);
392 return error;
393 }
394
395 static int
396 xfs_growfs_log_private(
397 xfs_mount_t *mp, /* mount point for filesystem */
398 xfs_growfs_log_t *in) /* growfs log input struct */
399 {
400 xfs_extlen_t nb;
401
402 nb = in->newblocks;
403 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
404 return XFS_ERROR(EINVAL);
405 if (nb == mp->m_sb.sb_logblocks &&
406 in->isint == (mp->m_sb.sb_logstart != 0))
407 return XFS_ERROR(EINVAL);
408 /*
409 * Moving the log is hard, need new interfaces to sync
410 * the log first, hold off all activity while moving it.
411 * Can have shorter or longer log in the same space,
412 * or transform internal to external log or vice versa.
413 */
414 return XFS_ERROR(ENOSYS);
415 }
416
417 /*
418 * protected versions of growfs function acquire and release locks on the mount
419 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
420 * XFS_IOC_FSGROWFSRT
421 */
422
423
424 int
425 xfs_growfs_data(
426 xfs_mount_t *mp,
427 xfs_growfs_data_t *in)
428 {
429 int error;
430 if (!cpsema(&mp->m_growlock))
431 return XFS_ERROR(EWOULDBLOCK);
432 error = xfs_growfs_data_private(mp, in);
433 vsema(&mp->m_growlock);
434 return error;
435 }
436
437 int
438 xfs_growfs_log(
439 xfs_mount_t *mp,
440 xfs_growfs_log_t *in)
441 {
442 int error;
443 if (!cpsema(&mp->m_growlock))
444 return XFS_ERROR(EWOULDBLOCK);
445 error = xfs_growfs_log_private(mp, in);
446 vsema(&mp->m_growlock);
447 return error;
448 }
449
450 /*
451 * exported through ioctl XFS_IOC_FSCOUNTS
452 */
453
454 int
455 xfs_fs_counts(
456 xfs_mount_t *mp,
457 xfs_fsop_counts_t *cnt)
458 {
459 unsigned long s;
460
461 xfs_icsb_sync_counters_flags(mp, XFS_ICSB_LAZY_COUNT);
462 s = XFS_SB_LOCK(mp);
463 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
464 cnt->freertx = mp->m_sb.sb_frextents;
465 cnt->freeino = mp->m_sb.sb_ifree;
466 cnt->allocino = mp->m_sb.sb_icount;
467 XFS_SB_UNLOCK(mp, s);
468 return 0;
469 }
470
471 /*
472 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
473 *
474 * xfs_reserve_blocks is called to set m_resblks
475 * in the in-core mount table. The number of unused reserved blocks
476 * is kept in m_resblks_avail.
477 *
478 * Reserve the requested number of blocks if available. Otherwise return
479 * as many as possible to satisfy the request. The actual number
480 * reserved are returned in outval
481 *
482 * A null inval pointer indicates that only the current reserved blocks
483 * available should be returned no settings are changed.
484 */
485
486 int
487 xfs_reserve_blocks(
488 xfs_mount_t *mp,
489 __uint64_t *inval,
490 xfs_fsop_resblks_t *outval)
491 {
492 __int64_t lcounter, delta, fdblks_delta;
493 __uint64_t request;
494 unsigned long s;
495
496 /* If inval is null, report current values and return */
497
498 if (inval == (__uint64_t *)NULL) {
499 outval->resblks = mp->m_resblks;
500 outval->resblks_avail = mp->m_resblks_avail;
501 return 0;
502 }
503
504 request = *inval;
505
506 /*
507 * With per-cpu counters, this becomes an interesting
508 * problem. we needto work out if we are freeing or allocation
509 * blocks first, then we can do the modification as necessary.
510 *
511 * We do this under the XFS_SB_LOCK so that if we are near
512 * ENOSPC, we will hold out any changes while we work out
513 * what to do. This means that the amount of free space can
514 * change while we do this, so we need to retry if we end up
515 * trying to reserve more space than is available.
516 *
517 * We also use the xfs_mod_incore_sb() interface so that we
518 * don't have to care about whether per cpu counter are
519 * enabled, disabled or even compiled in....
520 */
521 retry:
522 s = XFS_SB_LOCK(mp);
523 xfs_icsb_sync_counters_flags(mp, XFS_ICSB_SB_LOCKED);
524
525 /*
526 * If our previous reservation was larger than the current value,
527 * then move any unused blocks back to the free pool.
528 */
529 fdblks_delta = 0;
530 if (mp->m_resblks > request) {
531 lcounter = mp->m_resblks_avail - request;
532 if (lcounter > 0) { /* release unused blocks */
533 fdblks_delta = lcounter;
534 mp->m_resblks_avail -= lcounter;
535 }
536 mp->m_resblks = request;
537 } else {
538 __int64_t free;
539
540 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
541 if (!free)
542 goto out; /* ENOSPC and fdblks_delta = 0 */
543
544 delta = request - mp->m_resblks;
545 lcounter = free - delta;
546 if (lcounter < 0) {
547 /* We can't satisfy the request, just get what we can */
548 mp->m_resblks += free;
549 mp->m_resblks_avail += free;
550 fdblks_delta = -free;
551 mp->m_sb.sb_fdblocks = XFS_ALLOC_SET_ASIDE(mp);
552 } else {
553 fdblks_delta = -delta;
554 mp->m_sb.sb_fdblocks =
555 lcounter + XFS_ALLOC_SET_ASIDE(mp);
556 mp->m_resblks = request;
557 mp->m_resblks_avail += delta;
558 }
559 }
560 out:
561 outval->resblks = mp->m_resblks;
562 outval->resblks_avail = mp->m_resblks_avail;
563 XFS_SB_UNLOCK(mp, s);
564
565 if (fdblks_delta) {
566 /*
567 * If we are putting blocks back here, m_resblks_avail is
568 * already at it's max so this will put it in the free pool.
569 *
570 * If we need space, we'll either succeed in getting it
571 * from the free block count or we'll get an enospc. If
572 * we get a ENOSPC, it means things changed while we were
573 * calculating fdblks_delta and so we should try again to
574 * see if there is anything left to reserve.
575 *
576 * Don't set the reserved flag here - we don't want to reserve
577 * the extra reserve blocks from the reserve.....
578 */
579 int error;
580 error = xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, fdblks_delta, 0);
581 if (error == ENOSPC)
582 goto retry;
583 }
584
585 return 0;
586 }
587
588 void
589 xfs_fs_log_dummy(
590 xfs_mount_t *mp)
591 {
592 xfs_trans_t *tp;
593 xfs_inode_t *ip;
594
595 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1);
596 if (xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0)) {
597 xfs_trans_cancel(tp, 0);
598 return;
599 }
600
601 ip = mp->m_rootip;
602 xfs_ilock(ip, XFS_ILOCK_EXCL);
603
604 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
605 xfs_trans_ihold(tp, ip);
606 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
607 xfs_trans_set_sync(tp);
608 xfs_trans_commit(tp, 0);
609
610 xfs_iunlock(ip, XFS_ILOCK_EXCL);
611 }
612
613 int
614 xfs_fs_goingdown(
615 xfs_mount_t *mp,
616 __uint32_t inflags)
617 {
618 switch (inflags) {
619 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
620 struct bhv_vfs *vfsp = XFS_MTOVFS(mp);
621 struct super_block *sb = freeze_bdev(vfsp->vfs_super->s_bdev);
622
623 if (sb && !IS_ERR(sb)) {
624 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
625 thaw_bdev(sb->s_bdev, sb);
626 }
627
628 break;
629 }
630 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
631 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
632 break;
633 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
634 xfs_force_shutdown(mp,
635 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
636 break;
637 default:
638 return XFS_ERROR(EINVAL);
639 }
640
641 return 0;
642 }
Tomato firmware and modifications.