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KVM: s390: Fix memslot initialization for userspace_addr != 0
[zen-stable.git] / fs / xfs / xfs_fsops.c
blob2d0b3e1da9e69094f798967e3ff432d679249f00
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 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
118 static int
119 xfs_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 error = xfs_read_buf(mp, mp->m_ddev_targp,
151 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
152 XFS_FSS_TO_BB(mp, 1), 0, &bp);
153 if (error)
154 return error;
155 ASSERT(bp);
156 xfs_buf_relse(bp);
157
158 new = nb; /* use new as a temporary here */
159 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
160 nagcount = new + (nb_mod != 0);
161 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
162 nagcount--;
163 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
164 if (nb < mp->m_sb.sb_dblocks)
165 return XFS_ERROR(EINVAL);
166 }
167 new = nb - mp->m_sb.sb_dblocks;
168 oagcount = mp->m_sb.sb_agcount;
169 if (nagcount > oagcount) {
170 void *new_perag, *old_perag;
171
172 xfs_filestream_flush(mp);
173
174 new_perag = kmem_zalloc(sizeof(xfs_perag_t) * nagcount,
175 KM_MAYFAIL);
176 if (!new_perag)
177 return XFS_ERROR(ENOMEM);
178
179 down_write(&mp->m_peraglock);
180 memcpy(new_perag, mp->m_perag, sizeof(xfs_perag_t) * oagcount);
181 old_perag = mp->m_perag;
182 mp->m_perag = new_perag;
183
184 mp->m_flags |= XFS_MOUNT_32BITINODES;
185 nagimax = xfs_initialize_perag(mp, nagcount);
186 up_write(&mp->m_peraglock);
187
188 kmem_free(old_perag);
189 }
190 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
191 tp->t_flags |= XFS_TRANS_RESERVE;
192 if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
193 XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
194 xfs_trans_cancel(tp, 0);
195 return error;
196 }
197
198 nfree = 0;
199 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
200 /*
201 * AG freelist header block
202 */
203 bp = xfs_buf_get(mp->m_ddev_targp,
204 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
205 XFS_FSS_TO_BB(mp, 1), 0);
206 agf = XFS_BUF_TO_AGF(bp);
207 memset(agf, 0, mp->m_sb.sb_sectsize);
208 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
209 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
210 agf->agf_seqno = cpu_to_be32(agno);
211 if (agno == nagcount - 1)
212 agsize =
213 nb -
214 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
215 else
216 agsize = mp->m_sb.sb_agblocks;
217 agf->agf_length = cpu_to_be32(agsize);
218 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
219 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
220 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
221 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
222 agf->agf_flfirst = 0;
223 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
224 agf->agf_flcount = 0;
225 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
226 agf->agf_freeblks = cpu_to_be32(tmpsize);
227 agf->agf_longest = cpu_to_be32(tmpsize);
228 error = xfs_bwrite(mp, bp);
229 if (error) {
230 goto error0;
231 }
232 /*
233 * AG inode header block
234 */
235 bp = xfs_buf_get(mp->m_ddev_targp,
236 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
237 XFS_FSS_TO_BB(mp, 1), 0);
238 agi = XFS_BUF_TO_AGI(bp);
239 memset(agi, 0, mp->m_sb.sb_sectsize);
240 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
241 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
242 agi->agi_seqno = cpu_to_be32(agno);
243 agi->agi_length = cpu_to_be32(agsize);
244 agi->agi_count = 0;
245 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
246 agi->agi_level = cpu_to_be32(1);
247 agi->agi_freecount = 0;
248 agi->agi_newino = cpu_to_be32(NULLAGINO);
249 agi->agi_dirino = cpu_to_be32(NULLAGINO);
250 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
251 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
252 error = xfs_bwrite(mp, bp);
253 if (error) {
254 goto error0;
255 }
256 /*
257 * BNO btree root block
258 */
259 bp = xfs_buf_get(mp->m_ddev_targp,
260 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
261 BTOBB(mp->m_sb.sb_blocksize), 0);
262 block = XFS_BUF_TO_BLOCK(bp);
263 memset(block, 0, mp->m_sb.sb_blocksize);
264 block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC);
265 block->bb_level = 0;
266 block->bb_numrecs = cpu_to_be16(1);
267 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
268 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
269 arec = XFS_ALLOC_REC_ADDR(mp, block, 1);
270 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
271 arec->ar_blockcount = cpu_to_be32(
272 agsize - be32_to_cpu(arec->ar_startblock));
273 error = xfs_bwrite(mp, bp);
274 if (error) {
275 goto error0;
276 }
277 /*
278 * CNT btree root block
279 */
280 bp = xfs_buf_get(mp->m_ddev_targp,
281 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
282 BTOBB(mp->m_sb.sb_blocksize), 0);
283 block = XFS_BUF_TO_BLOCK(bp);
284 memset(block, 0, mp->m_sb.sb_blocksize);
285 block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC);
286 block->bb_level = 0;
287 block->bb_numrecs = cpu_to_be16(1);
288 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
289 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
290 arec = XFS_ALLOC_REC_ADDR(mp, block, 1);
291 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
292 arec->ar_blockcount = cpu_to_be32(
293 agsize - be32_to_cpu(arec->ar_startblock));
294 nfree += be32_to_cpu(arec->ar_blockcount);
295 error = xfs_bwrite(mp, bp);
296 if (error) {
297 goto error0;
298 }
299 /*
300 * INO btree root block
301 */
302 bp = xfs_buf_get(mp->m_ddev_targp,
303 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
304 BTOBB(mp->m_sb.sb_blocksize), 0);
305 block = XFS_BUF_TO_BLOCK(bp);
306 memset(block, 0, mp->m_sb.sb_blocksize);
307 block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC);
308 block->bb_level = 0;
309 block->bb_numrecs = 0;
310 block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
311 block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
312 error = xfs_bwrite(mp, bp);
313 if (error) {
314 goto error0;
315 }
316 }
317 xfs_trans_agblocks_delta(tp, nfree);
318 /*
319 * There are new blocks in the old last a.g.
320 */
321 if (new) {
322 /*
323 * Change the agi length.
324 */
325 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
326 if (error) {
327 goto error0;
328 }
329 ASSERT(bp);
330 agi = XFS_BUF_TO_AGI(bp);
331 be32_add_cpu(&agi->agi_length, new);
332 ASSERT(nagcount == oagcount ||
333 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
334 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
335 /*
336 * Change agf length.
337 */
338 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
339 if (error) {
340 goto error0;
341 }
342 ASSERT(bp);
343 agf = XFS_BUF_TO_AGF(bp);
344 be32_add_cpu(&agf->agf_length, new);
345 ASSERT(be32_to_cpu(agf->agf_length) ==
346 be32_to_cpu(agi->agi_length));
347 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
348 /*
349 * Free the new space.
350 */
351 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
352 be32_to_cpu(agf->agf_length) - new), new);
353 if (error) {
354 goto error0;
355 }
356 }
357 if (nagcount > oagcount)
358 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
359 if (nb > mp->m_sb.sb_dblocks)
360 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
361 nb - mp->m_sb.sb_dblocks);
362 if (nfree)
363 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
364 if (dpct)
365 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
366 error = xfs_trans_commit(tp, 0);
367 if (error) {
368 return error;
369 }
370 /* New allocation groups fully initialized, so update mount struct */
371 if (nagimax)
372 mp->m_maxagi = nagimax;
373 if (mp->m_sb.sb_imax_pct) {
374 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
375 do_div(icount, 100);
376 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
377 } else
378 mp->m_maxicount = 0;
379 for (agno = 1; agno < nagcount; agno++) {
380 error = xfs_read_buf(mp, mp->m_ddev_targp,
381 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
382 XFS_FSS_TO_BB(mp, 1), 0, &bp);
383 if (error) {
384 xfs_fs_cmn_err(CE_WARN, mp,
385 "error %d reading secondary superblock for ag %d",
386 error, agno);
387 break;
388 }
389 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
390 /*
391 * If we get an error writing out the alternate superblocks,
392 * just issue a warning and continue. The real work is
393 * already done and committed.
394 */
395 if (!(error = xfs_bwrite(mp, bp))) {
396 continue;
397 } else {
398 xfs_fs_cmn_err(CE_WARN, mp,
399 "write error %d updating secondary superblock for ag %d",
400 error, agno);
401 break; /* no point in continuing */
402 }
403 }
404 return 0;
405
406 error0:
407 xfs_trans_cancel(tp, XFS_TRANS_ABORT);
408 return error;
409 }
410
411 static int
412 xfs_growfs_log_private(
413 xfs_mount_t *mp, /* mount point for filesystem */
414 xfs_growfs_log_t *in) /* growfs log input struct */
415 {
416 xfs_extlen_t nb;
417
418 nb = in->newblocks;
419 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
420 return XFS_ERROR(EINVAL);
421 if (nb == mp->m_sb.sb_logblocks &&
422 in->isint == (mp->m_sb.sb_logstart != 0))
423 return XFS_ERROR(EINVAL);
424 /*
425 * Moving the log is hard, need new interfaces to sync
426 * the log first, hold off all activity while moving it.
427 * Can have shorter or longer log in the same space,
428 * or transform internal to external log or vice versa.
429 */
430 return XFS_ERROR(ENOSYS);
431 }
432
433 /*
434 * protected versions of growfs function acquire and release locks on the mount
435 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
436 * XFS_IOC_FSGROWFSRT
437 */
438
439
440 int
441 xfs_growfs_data(
442 xfs_mount_t *mp,
443 xfs_growfs_data_t *in)
444 {
445 int error;
446
447 if (!capable(CAP_SYS_ADMIN))
448 return XFS_ERROR(EPERM);
449 if (!mutex_trylock(&mp->m_growlock))
450 return XFS_ERROR(EWOULDBLOCK);
451 error = xfs_growfs_data_private(mp, in);
452 mutex_unlock(&mp->m_growlock);
453 return error;
454 }
455
456 int
457 xfs_growfs_log(
458 xfs_mount_t *mp,
459 xfs_growfs_log_t *in)
460 {
461 int error;
462
463 if (!capable(CAP_SYS_ADMIN))
464 return XFS_ERROR(EPERM);
465 if (!mutex_trylock(&mp->m_growlock))
466 return XFS_ERROR(EWOULDBLOCK);
467 error = xfs_growfs_log_private(mp, in);
468 mutex_unlock(&mp->m_growlock);
469 return error;
470 }
471
472 /*
473 * exported through ioctl XFS_IOC_FSCOUNTS
474 */
475
476 int
477 xfs_fs_counts(
478 xfs_mount_t *mp,
479 xfs_fsop_counts_t *cnt)
480 {
481 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
482 spin_lock(&mp->m_sb_lock);
483 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
484 cnt->freertx = mp->m_sb.sb_frextents;
485 cnt->freeino = mp->m_sb.sb_ifree;
486 cnt->allocino = mp->m_sb.sb_icount;
487 spin_unlock(&mp->m_sb_lock);
488 return 0;
489 }
490
491 /*
492 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
493 *
494 * xfs_reserve_blocks is called to set m_resblks
495 * in the in-core mount table. The number of unused reserved blocks
496 * is kept in m_resblks_avail.
497 *
498 * Reserve the requested number of blocks if available. Otherwise return
499 * as many as possible to satisfy the request. The actual number
500 * reserved are returned in outval
501 *
502 * A null inval pointer indicates that only the current reserved blocks
503 * available should be returned no settings are changed.
504 */
505
506 int
507 xfs_reserve_blocks(
508 xfs_mount_t *mp,
509 __uint64_t *inval,
510 xfs_fsop_resblks_t *outval)
511 {
512 __int64_t lcounter, delta, fdblks_delta;
513 __uint64_t request;
514
515 /* If inval is null, report current values and return */
516 if (inval == (__uint64_t *)NULL) {
517 if (!outval)
518 return EINVAL;
519 outval->resblks = mp->m_resblks;
520 outval->resblks_avail = mp->m_resblks_avail;
521 return 0;
522 }
523
524 request = *inval;
525
526 /*
527 * With per-cpu counters, this becomes an interesting
528 * problem. we needto work out if we are freeing or allocation
529 * blocks first, then we can do the modification as necessary.
530 *
531 * We do this under the m_sb_lock so that if we are near
532 * ENOSPC, we will hold out any changes while we work out
533 * what to do. This means that the amount of free space can
534 * change while we do this, so we need to retry if we end up
535 * trying to reserve more space than is available.
536 *
537 * We also use the xfs_mod_incore_sb() interface so that we
538 * don't have to care about whether per cpu counter are
539 * enabled, disabled or even compiled in....
540 */
541 retry:
542 spin_lock(&mp->m_sb_lock);
543 xfs_icsb_sync_counters_locked(mp, 0);
544
545 /*
546 * If our previous reservation was larger than the current value,
547 * then move any unused blocks back to the free pool.
548 */
549 fdblks_delta = 0;
550 if (mp->m_resblks > request) {
551 lcounter = mp->m_resblks_avail - request;
552 if (lcounter > 0) { /* release unused blocks */
553 fdblks_delta = lcounter;
554 mp->m_resblks_avail -= lcounter;
555 }
556 mp->m_resblks = request;
557 } else {
558 __int64_t free;
559
560 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
561 if (!free)
562 goto out; /* ENOSPC and fdblks_delta = 0 */
563
564 delta = request - mp->m_resblks;
565 lcounter = free - delta;
566 if (lcounter < 0) {
567 /* We can't satisfy the request, just get what we can */
568 mp->m_resblks += free;
569 mp->m_resblks_avail += free;
570 fdblks_delta = -free;
571 } else {
572 fdblks_delta = -delta;
573 mp->m_resblks = request;
574 mp->m_resblks_avail += delta;
575 }
576 }
577 out:
578 if (outval) {
579 outval->resblks = mp->m_resblks;
580 outval->resblks_avail = mp->m_resblks_avail;
581 }
582 spin_unlock(&mp->m_sb_lock);
583
584 if (fdblks_delta) {
585 /*
586 * If we are putting blocks back here, m_resblks_avail is
587 * already at its max so this will put it in the free pool.
588 *
589 * If we need space, we'll either succeed in getting it
590 * from the free block count or we'll get an enospc. If
591 * we get a ENOSPC, it means things changed while we were
592 * calculating fdblks_delta and so we should try again to
593 * see if there is anything left to reserve.
594 *
595 * Don't set the reserved flag here - we don't want to reserve
596 * the extra reserve blocks from the reserve.....
597 */
598 int error;
599 error = xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, fdblks_delta, 0);
600 if (error == ENOSPC)
601 goto retry;
602 }
603 return 0;
604 }
605
606 int
607 xfs_fs_log_dummy(
608 xfs_mount_t *mp)
609 {
610 xfs_trans_t *tp;
611 xfs_inode_t *ip;
612 int error;
613
614 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1);
615 error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0);
616 if (error) {
617 xfs_trans_cancel(tp, 0);
618 return error;
619 }
620
621 ip = mp->m_rootip;
622 xfs_ilock(ip, XFS_ILOCK_EXCL);
623
624 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
625 xfs_trans_ihold(tp, ip);
626 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
627 xfs_trans_set_sync(tp);
628 error = xfs_trans_commit(tp, 0);
629
630 xfs_iunlock(ip, XFS_ILOCK_EXCL);
631 return error;
632 }
633
634 int
635 xfs_fs_goingdown(
636 xfs_mount_t *mp,
637 __uint32_t inflags)
638 {
639 switch (inflags) {
640 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
641 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
642
643 if (sb && !IS_ERR(sb)) {
644 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
645 thaw_bdev(sb->s_bdev, sb);
646 }
647
648 break;
649 }
650 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
651 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
652 break;
653 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
654 xfs_force_shutdown(mp,
655 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
656 break;
657 default:
658 return XFS_ERROR(EINVAL);
659 }
660
661 return 0;
662 }