1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
4 | * All Rights Reserved. |
5 | */ |
6 | #include "xfs.h" |
7 | #include "xfs_fs.h" |
8 | #include "xfs_shared.h" |
9 | #include "xfs_format.h" |
10 | #include "xfs_log_format.h" |
11 | #include "xfs_trans_resv.h" |
12 | #include "xfs_sb.h" |
13 | #include "xfs_mount.h" |
14 | #include "xfs_trans.h" |
15 | #include "xfs_error.h" |
16 | #include "xfs_alloc.h" |
17 | #include "xfs_fsops.h" |
18 | #include "xfs_trans_space.h" |
19 | #include "xfs_log.h" |
20 | #include "xfs_log_priv.h" |
21 | #include "xfs_ag.h" |
22 | #include "xfs_ag_resv.h" |
23 | #include "xfs_trace.h" |
24 | |
25 | /* |
26 | * Write new AG headers to disk. Non-transactional, but need to be |
27 | * written and completed prior to the growfs transaction being logged. |
28 | * To do this, we use a delayed write buffer list and wait for |
29 | * submission and IO completion of the list as a whole. This allows the |
30 | * IO subsystem to merge all the AG headers in a single AG into a single |
31 | * IO and hide most of the latency of the IO from us. |
32 | * |
33 | * This also means that if we get an error whilst building the buffer |
34 | * list to write, we can cancel the entire list without having written |
35 | * anything. |
36 | */ |
37 | static int |
38 | xfs_resizefs_init_new_ags( |
39 | struct xfs_trans *tp, |
40 | struct aghdr_init_data *id, |
41 | xfs_agnumber_t oagcount, |
42 | xfs_agnumber_t nagcount, |
43 | xfs_rfsblock_t delta, |
44 | struct xfs_perag *last_pag, |
45 | bool *lastag_extended) |
46 | { |
47 | struct xfs_mount *mp = tp->t_mountp; |
48 | xfs_rfsblock_t nb = mp->m_sb.sb_dblocks + delta; |
49 | int error; |
50 | |
51 | *lastag_extended = false; |
52 | |
53 | INIT_LIST_HEAD(list: &id->buffer_list); |
54 | for (id->agno = nagcount - 1; |
55 | id->agno >= oagcount; |
56 | id->agno--, delta -= id->agsize) { |
57 | |
58 | if (id->agno == nagcount - 1) |
59 | id->agsize = nb - (id->agno * |
60 | (xfs_rfsblock_t)mp->m_sb.sb_agblocks); |
61 | else |
62 | id->agsize = mp->m_sb.sb_agblocks; |
63 | |
64 | error = xfs_ag_init_headers(mp, id); |
65 | if (error) { |
66 | xfs_buf_delwri_cancel(&id->buffer_list); |
67 | return error; |
68 | } |
69 | } |
70 | |
71 | error = xfs_buf_delwri_submit(&id->buffer_list); |
72 | if (error) |
73 | return error; |
74 | |
75 | if (delta) { |
76 | *lastag_extended = true; |
77 | error = xfs_ag_extend_space(last_pag, tp, delta); |
78 | } |
79 | return error; |
80 | } |
81 | |
82 | /* |
83 | * growfs operations |
84 | */ |
85 | static int |
86 | xfs_growfs_data_private( |
87 | struct xfs_mount *mp, /* mount point for filesystem */ |
88 | struct xfs_growfs_data *in) /* growfs data input struct */ |
89 | { |
90 | struct xfs_buf *bp; |
91 | int error; |
92 | xfs_agnumber_t nagcount; |
93 | xfs_agnumber_t nagimax = 0; |
94 | xfs_rfsblock_t nb, nb_div, nb_mod; |
95 | int64_t delta; |
96 | bool lastag_extended = false; |
97 | xfs_agnumber_t oagcount; |
98 | struct xfs_trans *tp; |
99 | struct aghdr_init_data id = {}; |
100 | struct xfs_perag *last_pag; |
101 | |
102 | nb = in->newblocks; |
103 | error = xfs_sb_validate_fsb_count(&mp->m_sb, nb); |
104 | if (error) |
105 | return error; |
106 | |
107 | if (nb > mp->m_sb.sb_dblocks) { |
108 | error = xfs_buf_read_uncached(mp->m_ddev_targp, |
109 | XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1), |
110 | XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL); |
111 | if (error) |
112 | return error; |
113 | xfs_buf_relse(bp); |
114 | } |
115 | |
116 | nb_div = nb; |
117 | nb_mod = do_div(nb_div, mp->m_sb.sb_agblocks); |
118 | if (nb_mod && nb_mod >= XFS_MIN_AG_BLOCKS) |
119 | nb_div++; |
120 | else if (nb_mod) |
121 | nb = nb_div * mp->m_sb.sb_agblocks; |
122 | |
123 | if (nb_div > XFS_MAX_AGNUMBER + 1) { |
124 | nb_div = XFS_MAX_AGNUMBER + 1; |
125 | nb = nb_div * mp->m_sb.sb_agblocks; |
126 | } |
127 | nagcount = nb_div; |
128 | delta = nb - mp->m_sb.sb_dblocks; |
129 | /* |
130 | * Reject filesystems with a single AG because they are not |
131 | * supported, and reject a shrink operation that would cause a |
132 | * filesystem to become unsupported. |
133 | */ |
134 | if (delta < 0 && nagcount < 2) |
135 | return -EINVAL; |
136 | |
137 | oagcount = mp->m_sb.sb_agcount; |
138 | /* allocate the new per-ag structures */ |
139 | if (nagcount > oagcount) { |
140 | error = xfs_initialize_perag(mp, nagcount, nb, &nagimax); |
141 | if (error) |
142 | return error; |
143 | } else if (nagcount < oagcount) { |
144 | /* TODO: shrinking the entire AGs hasn't yet completed */ |
145 | return -EINVAL; |
146 | } |
147 | |
148 | if (delta > 0) |
149 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata, |
150 | XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, |
151 | &tp); |
152 | else |
153 | error = xfs_trans_alloc(mp, resp: &M_RES(mp)->tr_growdata, blocks: -delta, rtextents: 0, |
154 | flags: 0, tpp: &tp); |
155 | if (error) |
156 | return error; |
157 | |
158 | last_pag = xfs_perag_get(mp, oagcount - 1); |
159 | if (delta > 0) { |
160 | error = xfs_resizefs_init_new_ags(tp, &id, oagcount, nagcount, |
161 | delta, last_pag, &lastag_extended); |
162 | } else { |
163 | xfs_warn_mount(mp, XFS_OPSTATE_WARNED_SHRINK, |
164 | "EXPERIMENTAL online shrink feature in use. Use at your own risk!" ); |
165 | |
166 | error = xfs_ag_shrink_space(last_pag, &tp, -delta); |
167 | } |
168 | xfs_perag_put(last_pag); |
169 | if (error) |
170 | goto out_trans_cancel; |
171 | |
172 | /* |
173 | * Update changed superblock fields transactionally. These are not |
174 | * seen by the rest of the world until the transaction commit applies |
175 | * them atomically to the superblock. |
176 | */ |
177 | if (nagcount > oagcount) |
178 | xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount); |
179 | if (delta) |
180 | xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, delta); |
181 | if (id.nfree) |
182 | xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, id.nfree); |
183 | |
184 | /* |
185 | * Sync sb counters now to reflect the updated values. This is |
186 | * particularly important for shrink because the write verifier |
187 | * will fail if sb_fdblocks is ever larger than sb_dblocks. |
188 | */ |
189 | if (xfs_has_lazysbcount(mp)) |
190 | xfs_log_sb(tp); |
191 | |
192 | xfs_trans_set_sync(tp); |
193 | error = xfs_trans_commit(tp); |
194 | if (error) |
195 | return error; |
196 | |
197 | /* New allocation groups fully initialized, so update mount struct */ |
198 | if (nagimax) |
199 | mp->m_maxagi = nagimax; |
200 | xfs_set_low_space_thresholds(mp); |
201 | mp->m_alloc_set_aside = xfs_alloc_set_aside(mp); |
202 | |
203 | if (delta > 0) { |
204 | /* |
205 | * If we expanded the last AG, free the per-AG reservation |
206 | * so we can reinitialize it with the new size. |
207 | */ |
208 | if (lastag_extended) { |
209 | struct xfs_perag *pag; |
210 | |
211 | pag = xfs_perag_get(mp, id.agno); |
212 | error = xfs_ag_resv_free(pag); |
213 | xfs_perag_put(pag); |
214 | if (error) |
215 | return error; |
216 | } |
217 | /* |
218 | * Reserve AG metadata blocks. ENOSPC here does not mean there |
219 | * was a growfs failure, just that there still isn't space for |
220 | * new user data after the grow has been run. |
221 | */ |
222 | error = xfs_fs_reserve_ag_blocks(mp); |
223 | if (error == -ENOSPC) |
224 | error = 0; |
225 | } |
226 | return error; |
227 | |
228 | out_trans_cancel: |
229 | xfs_trans_cancel(tp); |
230 | return error; |
231 | } |
232 | |
233 | static int |
234 | xfs_growfs_log_private( |
235 | struct xfs_mount *mp, /* mount point for filesystem */ |
236 | struct xfs_growfs_log *in) /* growfs log input struct */ |
237 | { |
238 | xfs_extlen_t nb; |
239 | |
240 | nb = in->newblocks; |
241 | if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES)) |
242 | return -EINVAL; |
243 | if (nb == mp->m_sb.sb_logblocks && |
244 | in->isint == (mp->m_sb.sb_logstart != 0)) |
245 | return -EINVAL; |
246 | /* |
247 | * Moving the log is hard, need new interfaces to sync |
248 | * the log first, hold off all activity while moving it. |
249 | * Can have shorter or longer log in the same space, |
250 | * or transform internal to external log or vice versa. |
251 | */ |
252 | return -ENOSYS; |
253 | } |
254 | |
255 | static int |
256 | xfs_growfs_imaxpct( |
257 | struct xfs_mount *mp, |
258 | __u32 imaxpct) |
259 | { |
260 | struct xfs_trans *tp; |
261 | int dpct; |
262 | int error; |
263 | |
264 | if (imaxpct > 100) |
265 | return -EINVAL; |
266 | |
267 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata, |
268 | XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp); |
269 | if (error) |
270 | return error; |
271 | |
272 | dpct = imaxpct - mp->m_sb.sb_imax_pct; |
273 | xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct); |
274 | xfs_trans_set_sync(tp); |
275 | return xfs_trans_commit(tp); |
276 | } |
277 | |
278 | /* |
279 | * protected versions of growfs function acquire and release locks on the mount |
280 | * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG, |
281 | * XFS_IOC_FSGROWFSRT |
282 | */ |
283 | int |
284 | xfs_growfs_data( |
285 | struct xfs_mount *mp, |
286 | struct xfs_growfs_data *in) |
287 | { |
288 | int error = 0; |
289 | |
290 | if (!capable(CAP_SYS_ADMIN)) |
291 | return -EPERM; |
292 | if (!mutex_trylock(lock: &mp->m_growlock)) |
293 | return -EWOULDBLOCK; |
294 | |
295 | /* update imaxpct separately to the physical grow of the filesystem */ |
296 | if (in->imaxpct != mp->m_sb.sb_imax_pct) { |
297 | error = xfs_growfs_imaxpct(mp, imaxpct: in->imaxpct); |
298 | if (error) |
299 | goto out_error; |
300 | } |
301 | |
302 | if (in->newblocks != mp->m_sb.sb_dblocks) { |
303 | error = xfs_growfs_data_private(mp, in); |
304 | if (error) |
305 | goto out_error; |
306 | } |
307 | |
308 | /* Post growfs calculations needed to reflect new state in operations */ |
309 | if (mp->m_sb.sb_imax_pct) { |
310 | uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct; |
311 | do_div(icount, 100); |
312 | M_IGEO(mp)->maxicount = XFS_FSB_TO_INO(mp, icount); |
313 | } else |
314 | M_IGEO(mp)->maxicount = 0; |
315 | |
316 | /* Update secondary superblocks now the physical grow has completed */ |
317 | error = xfs_update_secondary_sbs(mp); |
318 | |
319 | out_error: |
320 | /* |
321 | * Increment the generation unconditionally, the error could be from |
322 | * updating the secondary superblocks, in which case the new size |
323 | * is live already. |
324 | */ |
325 | mp->m_generation++; |
326 | mutex_unlock(lock: &mp->m_growlock); |
327 | return error; |
328 | } |
329 | |
330 | int |
331 | xfs_growfs_log( |
332 | xfs_mount_t *mp, |
333 | struct xfs_growfs_log *in) |
334 | { |
335 | int error; |
336 | |
337 | if (!capable(CAP_SYS_ADMIN)) |
338 | return -EPERM; |
339 | if (!mutex_trylock(lock: &mp->m_growlock)) |
340 | return -EWOULDBLOCK; |
341 | error = xfs_growfs_log_private(mp, in); |
342 | mutex_unlock(lock: &mp->m_growlock); |
343 | return error; |
344 | } |
345 | |
346 | /* |
347 | * exported through ioctl XFS_IOC_FSCOUNTS |
348 | */ |
349 | |
350 | void |
351 | xfs_fs_counts( |
352 | xfs_mount_t *mp, |
353 | xfs_fsop_counts_t *cnt) |
354 | { |
355 | cnt->allocino = percpu_counter_read_positive(fbc: &mp->m_icount); |
356 | cnt->freeino = percpu_counter_read_positive(fbc: &mp->m_ifree); |
357 | cnt->freedata = percpu_counter_read_positive(fbc: &mp->m_fdblocks) - |
358 | xfs_fdblocks_unavailable(mp); |
359 | cnt->freertx = percpu_counter_read_positive(fbc: &mp->m_frextents); |
360 | } |
361 | |
362 | /* |
363 | * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS |
364 | * |
365 | * xfs_reserve_blocks is called to set m_resblks |
366 | * in the in-core mount table. The number of unused reserved blocks |
367 | * is kept in m_resblks_avail. |
368 | * |
369 | * Reserve the requested number of blocks if available. Otherwise return |
370 | * as many as possible to satisfy the request. The actual number |
371 | * reserved are returned in outval |
372 | * |
373 | * A null inval pointer indicates that only the current reserved blocks |
374 | * available should be returned no settings are changed. |
375 | */ |
376 | |
377 | int |
378 | xfs_reserve_blocks( |
379 | xfs_mount_t *mp, |
380 | uint64_t *inval, |
381 | xfs_fsop_resblks_t *outval) |
382 | { |
383 | int64_t lcounter, delta; |
384 | int64_t fdblks_delta = 0; |
385 | uint64_t request; |
386 | int64_t free; |
387 | int error = 0; |
388 | |
389 | /* If inval is null, report current values and return */ |
390 | if (inval == (uint64_t *)NULL) { |
391 | if (!outval) |
392 | return -EINVAL; |
393 | outval->resblks = mp->m_resblks; |
394 | outval->resblks_avail = mp->m_resblks_avail; |
395 | return 0; |
396 | } |
397 | |
398 | request = *inval; |
399 | |
400 | /* |
401 | * With per-cpu counters, this becomes an interesting problem. we need |
402 | * to work out if we are freeing or allocation blocks first, then we can |
403 | * do the modification as necessary. |
404 | * |
405 | * We do this under the m_sb_lock so that if we are near ENOSPC, we will |
406 | * hold out any changes while we work out what to do. This means that |
407 | * the amount of free space can change while we do this, so we need to |
408 | * retry if we end up trying to reserve more space than is available. |
409 | */ |
410 | spin_lock(lock: &mp->m_sb_lock); |
411 | |
412 | /* |
413 | * If our previous reservation was larger than the current value, |
414 | * then move any unused blocks back to the free pool. Modify the resblks |
415 | * counters directly since we shouldn't have any problems unreserving |
416 | * space. |
417 | */ |
418 | if (mp->m_resblks > request) { |
419 | lcounter = mp->m_resblks_avail - request; |
420 | if (lcounter > 0) { /* release unused blocks */ |
421 | fdblks_delta = lcounter; |
422 | mp->m_resblks_avail -= lcounter; |
423 | } |
424 | mp->m_resblks = request; |
425 | if (fdblks_delta) { |
426 | spin_unlock(lock: &mp->m_sb_lock); |
427 | error = xfs_mod_fdblocks(mp, delta: fdblks_delta, reserved: 0); |
428 | spin_lock(lock: &mp->m_sb_lock); |
429 | } |
430 | |
431 | goto out; |
432 | } |
433 | |
434 | /* |
435 | * If the request is larger than the current reservation, reserve the |
436 | * blocks before we update the reserve counters. Sample m_fdblocks and |
437 | * perform a partial reservation if the request exceeds free space. |
438 | * |
439 | * The code below estimates how many blocks it can request from |
440 | * fdblocks to stash in the reserve pool. This is a classic TOCTOU |
441 | * race since fdblocks updates are not always coordinated via |
442 | * m_sb_lock. Set the reserve size even if there's not enough free |
443 | * space to fill it because mod_fdblocks will refill an undersized |
444 | * reserve when it can. |
445 | */ |
446 | free = percpu_counter_sum(fbc: &mp->m_fdblocks) - |
447 | xfs_fdblocks_unavailable(mp); |
448 | delta = request - mp->m_resblks; |
449 | mp->m_resblks = request; |
450 | if (delta > 0 && free > 0) { |
451 | /* |
452 | * We'll either succeed in getting space from the free block |
453 | * count or we'll get an ENOSPC. Don't set the reserved flag |
454 | * here - we don't want to reserve the extra reserve blocks |
455 | * from the reserve. |
456 | * |
457 | * The desired reserve size can change after we drop the lock. |
458 | * Use mod_fdblocks to put the space into the reserve or into |
459 | * fdblocks as appropriate. |
460 | */ |
461 | fdblks_delta = min(free, delta); |
462 | spin_unlock(lock: &mp->m_sb_lock); |
463 | error = xfs_mod_fdblocks(mp, delta: -fdblks_delta, reserved: 0); |
464 | if (!error) |
465 | xfs_mod_fdblocks(mp, delta: fdblks_delta, reserved: 0); |
466 | spin_lock(lock: &mp->m_sb_lock); |
467 | } |
468 | out: |
469 | if (outval) { |
470 | outval->resblks = mp->m_resblks; |
471 | outval->resblks_avail = mp->m_resblks_avail; |
472 | } |
473 | |
474 | spin_unlock(lock: &mp->m_sb_lock); |
475 | return error; |
476 | } |
477 | |
478 | int |
479 | xfs_fs_goingdown( |
480 | xfs_mount_t *mp, |
481 | uint32_t inflags) |
482 | { |
483 | switch (inflags) { |
484 | case XFS_FSOP_GOING_FLAGS_DEFAULT: { |
485 | if (!freeze_bdev(bdev: mp->m_super->s_bdev)) { |
486 | xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); |
487 | thaw_bdev(bdev: mp->m_super->s_bdev); |
488 | } |
489 | break; |
490 | } |
491 | case XFS_FSOP_GOING_FLAGS_LOGFLUSH: |
492 | xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); |
493 | break; |
494 | case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH: |
495 | xfs_force_shutdown(mp, |
496 | SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR); |
497 | break; |
498 | default: |
499 | return -EINVAL; |
500 | } |
501 | |
502 | return 0; |
503 | } |
504 | |
505 | /* |
506 | * Force a shutdown of the filesystem instantly while keeping the filesystem |
507 | * consistent. We don't do an unmount here; just shutdown the shop, make sure |
508 | * that absolutely nothing persistent happens to this filesystem after this |
509 | * point. |
510 | * |
511 | * The shutdown state change is atomic, resulting in the first and only the |
512 | * first shutdown call processing the shutdown. This means we only shutdown the |
513 | * log once as it requires, and we don't spam the logs when multiple concurrent |
514 | * shutdowns race to set the shutdown flags. |
515 | */ |
516 | void |
517 | xfs_do_force_shutdown( |
518 | struct xfs_mount *mp, |
519 | uint32_t flags, |
520 | char *fname, |
521 | int lnnum) |
522 | { |
523 | int tag; |
524 | const char *why; |
525 | |
526 | |
527 | if (test_and_set_bit(XFS_OPSTATE_SHUTDOWN, addr: &mp->m_opstate)) { |
528 | xlog_shutdown_wait(log: mp->m_log); |
529 | return; |
530 | } |
531 | if (mp->m_sb_bp) |
532 | mp->m_sb_bp->b_flags |= XBF_DONE; |
533 | |
534 | if (flags & SHUTDOWN_FORCE_UMOUNT) |
535 | xfs_alert(mp, "User initiated shutdown received." ); |
536 | |
537 | if (xlog_force_shutdown(log: mp->m_log, shutdown_flags: flags)) { |
538 | tag = XFS_PTAG_SHUTDOWN_LOGERROR; |
539 | why = "Log I/O Error" ; |
540 | } else if (flags & SHUTDOWN_CORRUPT_INCORE) { |
541 | tag = XFS_PTAG_SHUTDOWN_CORRUPT; |
542 | why = "Corruption of in-memory data" ; |
543 | } else if (flags & SHUTDOWN_CORRUPT_ONDISK) { |
544 | tag = XFS_PTAG_SHUTDOWN_CORRUPT; |
545 | why = "Corruption of on-disk metadata" ; |
546 | } else if (flags & SHUTDOWN_DEVICE_REMOVED) { |
547 | tag = XFS_PTAG_SHUTDOWN_IOERROR; |
548 | why = "Block device removal" ; |
549 | } else { |
550 | tag = XFS_PTAG_SHUTDOWN_IOERROR; |
551 | why = "Metadata I/O Error" ; |
552 | } |
553 | |
554 | trace_xfs_force_shutdown(mp, ptag: tag, flags, fname, line_num: lnnum); |
555 | |
556 | xfs_alert_tag(mp, tag, |
557 | "%s (0x%x) detected at %pS (%s:%d). Shutting down filesystem." , |
558 | why, flags, __return_address, fname, lnnum); |
559 | xfs_alert(mp, |
560 | "Please unmount the filesystem and rectify the problem(s)" ); |
561 | if (xfs_error_level >= XFS_ERRLEVEL_HIGH) |
562 | xfs_stack_trace(); |
563 | } |
564 | |
565 | /* |
566 | * Reserve free space for per-AG metadata. |
567 | */ |
568 | int |
569 | xfs_fs_reserve_ag_blocks( |
570 | struct xfs_mount *mp) |
571 | { |
572 | xfs_agnumber_t agno; |
573 | struct xfs_perag *pag; |
574 | int error = 0; |
575 | int err2; |
576 | |
577 | mp->m_finobt_nores = false; |
578 | for_each_perag(mp, agno, pag) { |
579 | err2 = xfs_ag_resv_init(pag, NULL); |
580 | if (err2 && !error) |
581 | error = err2; |
582 | } |
583 | |
584 | if (error && error != -ENOSPC) { |
585 | xfs_warn(mp, |
586 | "Error %d reserving per-AG metadata reserve pool." , error); |
587 | xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); |
588 | } |
589 | |
590 | return error; |
591 | } |
592 | |
593 | /* |
594 | * Free space reserved for per-AG metadata. |
595 | */ |
596 | int |
597 | xfs_fs_unreserve_ag_blocks( |
598 | struct xfs_mount *mp) |
599 | { |
600 | xfs_agnumber_t agno; |
601 | struct xfs_perag *pag; |
602 | int error = 0; |
603 | int err2; |
604 | |
605 | for_each_perag(mp, agno, pag) { |
606 | err2 = xfs_ag_resv_free(pag); |
607 | if (err2 && !error) |
608 | error = err2; |
609 | } |
610 | |
611 | if (error) |
612 | xfs_warn(mp, |
613 | "Error %d freeing per-AG metadata reserve pool." , error); |
614 | |
615 | return error; |
616 | } |
617 | |