1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
8 #include "xfs_shared.h"
9 #include "xfs_format.h"
10 #include "xfs_log_format.h"
11 #include "xfs_trans_resv.h"
13 #include "xfs_mount.h"
14 #include "xfs_defer.h"
15 #include "xfs_trans.h"
16 #include "xfs_error.h"
17 #include "xfs_btree.h"
18 #include "xfs_alloc.h"
19 #include "xfs_fsops.h"
20 #include "xfs_trans_space.h"
21 #include "xfs_rtalloc.h"
22 #include "xfs_trace.h"
25 #include "xfs_ag_resv.h"
31 xfs_growfs_data_private(
32 xfs_mount_t *mp, /* mount point for filesystem */
33 xfs_growfs_data_t *in) /* growfs data input struct */
37 xfs_agnumber_t nagcount;
38 xfs_agnumber_t nagimax = 0;
39 xfs_rfsblock_t nb, nb_mod;
41 xfs_agnumber_t oagcount;
43 LIST_HEAD (buffer_list);
44 struct aghdr_init_data id = {};
47 if (nb < mp->m_sb.sb_dblocks)
49 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
51 error = xfs_buf_read_uncached(mp->m_ddev_targp,
52 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
53 XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);
58 new = nb; /* use new as a temporary here */
59 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
60 nagcount = new + (nb_mod != 0);
61 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
63 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
64 if (nb < mp->m_sb.sb_dblocks)
67 new = nb - mp->m_sb.sb_dblocks;
68 oagcount = mp->m_sb.sb_agcount;
70 /* allocate the new per-ag structures */
71 if (nagcount > oagcount) {
72 error = xfs_initialize_perag(mp, nagcount, &nagimax);
77 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
78 XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp);
83 * Write new AG headers to disk. Non-transactional, but need to be
84 * written and completed prior to the growfs transaction being logged.
85 * To do this, we use a delayed write buffer list and wait for
86 * submission and IO completion of the list as a whole. This allows the
87 * IO subsystem to merge all the AG headers in a single AG into a single
88 * IO and hide most of the latency of the IO from us.
90 * This also means that if we get an error whilst building the buffer
91 * list to write, we can cancel the entire list without having written
94 INIT_LIST_HEAD(&id.buffer_list);
95 for (id.agno = nagcount - 1;
97 id.agno--, new -= id.agsize) {
99 if (id.agno == nagcount - 1)
101 (id.agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
103 id.agsize = mp->m_sb.sb_agblocks;
105 error = xfs_ag_init_headers(mp, &id);
107 xfs_buf_delwri_cancel(&id.buffer_list);
108 goto out_trans_cancel;
111 error = xfs_buf_delwri_submit(&id.buffer_list);
113 goto out_trans_cancel;
115 xfs_trans_agblocks_delta(tp, id.nfree);
117 /* If there are new blocks in the old last AG, extend it. */
119 error = xfs_ag_extend_space(mp, tp, &id, new);
121 goto out_trans_cancel;
125 * Update changed superblock fields transactionally. These are not
126 * seen by the rest of the world until the transaction commit applies
127 * them atomically to the superblock.
129 if (nagcount > oagcount)
130 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
131 if (nb > mp->m_sb.sb_dblocks)
132 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
133 nb - mp->m_sb.sb_dblocks);
135 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, id.nfree);
136 xfs_trans_set_sync(tp);
137 error = xfs_trans_commit(tp);
141 /* New allocation groups fully initialized, so update mount struct */
143 mp->m_maxagi = nagimax;
144 xfs_set_low_space_thresholds(mp);
145 mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
148 * If we expanded the last AG, free the per-AG reservation
149 * so we can reinitialize it with the new size.
152 struct xfs_perag *pag;
154 pag = xfs_perag_get(mp, id.agno);
155 error = xfs_ag_resv_free(pag);
162 * Reserve AG metadata blocks. ENOSPC here does not mean there was a
163 * growfs failure, just that there still isn't space for new user data
164 * after the grow has been run.
166 error = xfs_fs_reserve_ag_blocks(mp);
167 if (error == -ENOSPC)
172 xfs_trans_cancel(tp);
177 xfs_growfs_log_private(
178 xfs_mount_t *mp, /* mount point for filesystem */
179 xfs_growfs_log_t *in) /* growfs log input struct */
184 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
186 if (nb == mp->m_sb.sb_logblocks &&
187 in->isint == (mp->m_sb.sb_logstart != 0))
190 * Moving the log is hard, need new interfaces to sync
191 * the log first, hold off all activity while moving it.
192 * Can have shorter or longer log in the same space,
193 * or transform internal to external log or vice versa.
200 struct xfs_mount *mp,
203 struct xfs_trans *tp;
210 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
211 XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp);
215 dpct = imaxpct - mp->m_sb.sb_imax_pct;
216 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
217 xfs_trans_set_sync(tp);
218 return xfs_trans_commit(tp);
222 * protected versions of growfs function acquire and release locks on the mount
223 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
228 struct xfs_mount *mp,
229 struct xfs_growfs_data *in)
233 if (!capable(CAP_SYS_ADMIN))
235 if (!mutex_trylock(&mp->m_growlock))
238 /* update imaxpct separately to the physical grow of the filesystem */
239 if (in->imaxpct != mp->m_sb.sb_imax_pct) {
240 error = xfs_growfs_imaxpct(mp, in->imaxpct);
245 if (in->newblocks != mp->m_sb.sb_dblocks) {
246 error = xfs_growfs_data_private(mp, in);
251 /* Post growfs calculations needed to reflect new state in operations */
252 if (mp->m_sb.sb_imax_pct) {
253 uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
255 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
259 /* Update secondary superblocks now the physical grow has completed */
260 error = xfs_update_secondary_sbs(mp);
264 * Increment the generation unconditionally, the error could be from
265 * updating the secondary superblocks, in which case the new size
269 mutex_unlock(&mp->m_growlock);
276 xfs_growfs_log_t *in)
280 if (!capable(CAP_SYS_ADMIN))
282 if (!mutex_trylock(&mp->m_growlock))
284 error = xfs_growfs_log_private(mp, in);
285 mutex_unlock(&mp->m_growlock);
290 * exported through ioctl XFS_IOC_FSCOUNTS
296 xfs_fsop_counts_t *cnt)
298 cnt->allocino = percpu_counter_read_positive(&mp->m_icount);
299 cnt->freeino = percpu_counter_read_positive(&mp->m_ifree);
300 cnt->freedata = percpu_counter_read_positive(&mp->m_fdblocks) -
301 mp->m_alloc_set_aside;
303 spin_lock(&mp->m_sb_lock);
304 cnt->freertx = mp->m_sb.sb_frextents;
305 spin_unlock(&mp->m_sb_lock);
310 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
312 * xfs_reserve_blocks is called to set m_resblks
313 * in the in-core mount table. The number of unused reserved blocks
314 * is kept in m_resblks_avail.
316 * Reserve the requested number of blocks if available. Otherwise return
317 * as many as possible to satisfy the request. The actual number
318 * reserved are returned in outval
320 * A null inval pointer indicates that only the current reserved blocks
321 * available should be returned no settings are changed.
328 xfs_fsop_resblks_t *outval)
330 int64_t lcounter, delta;
331 int64_t fdblks_delta = 0;
336 /* If inval is null, report current values and return */
337 if (inval == (uint64_t *)NULL) {
340 outval->resblks = mp->m_resblks;
341 outval->resblks_avail = mp->m_resblks_avail;
348 * With per-cpu counters, this becomes an interesting problem. we need
349 * to work out if we are freeing or allocation blocks first, then we can
350 * do the modification as necessary.
352 * We do this under the m_sb_lock so that if we are near ENOSPC, we will
353 * hold out any changes while we work out what to do. This means that
354 * the amount of free space can change while we do this, so we need to
355 * retry if we end up trying to reserve more space than is available.
357 spin_lock(&mp->m_sb_lock);
360 * If our previous reservation was larger than the current value,
361 * then move any unused blocks back to the free pool. Modify the resblks
362 * counters directly since we shouldn't have any problems unreserving
365 if (mp->m_resblks > request) {
366 lcounter = mp->m_resblks_avail - request;
367 if (lcounter > 0) { /* release unused blocks */
368 fdblks_delta = lcounter;
369 mp->m_resblks_avail -= lcounter;
371 mp->m_resblks = request;
373 spin_unlock(&mp->m_sb_lock);
374 error = xfs_mod_fdblocks(mp, fdblks_delta, 0);
375 spin_lock(&mp->m_sb_lock);
382 * If the request is larger than the current reservation, reserve the
383 * blocks before we update the reserve counters. Sample m_fdblocks and
384 * perform a partial reservation if the request exceeds free space.
388 free = percpu_counter_sum(&mp->m_fdblocks) -
389 mp->m_alloc_set_aside;
393 delta = request - mp->m_resblks;
394 lcounter = free - delta;
396 /* We can't satisfy the request, just get what we can */
399 fdblks_delta = delta;
402 * We'll either succeed in getting space from the free block
403 * count or we'll get an ENOSPC. If we get a ENOSPC, it means
404 * things changed while we were calculating fdblks_delta and so
405 * we should try again to see if there is anything left to
408 * Don't set the reserved flag here - we don't want to reserve
409 * the extra reserve blocks from the reserve.....
411 spin_unlock(&mp->m_sb_lock);
412 error = xfs_mod_fdblocks(mp, -fdblks_delta, 0);
413 spin_lock(&mp->m_sb_lock);
414 } while (error == -ENOSPC);
417 * Update the reserve counters if blocks have been successfully
420 if (!error && fdblks_delta) {
421 mp->m_resblks += fdblks_delta;
422 mp->m_resblks_avail += fdblks_delta;
427 outval->resblks = mp->m_resblks;
428 outval->resblks_avail = mp->m_resblks_avail;
431 spin_unlock(&mp->m_sb_lock);
441 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
442 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
444 if (sb && !IS_ERR(sb)) {
445 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
446 thaw_bdev(sb->s_bdev, sb);
451 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
452 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
454 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
455 xfs_force_shutdown(mp,
456 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
466 * Force a shutdown of the filesystem instantly while keeping the filesystem
467 * consistent. We don't do an unmount here; just shutdown the shop, make sure
468 * that absolutely nothing persistent happens to this filesystem after this
472 xfs_do_force_shutdown(
480 logerror = flags & SHUTDOWN_LOG_IO_ERROR;
482 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
484 "%s(0x%x) called from line %d of file %s. Return address = "PTR_FMT,
485 __func__, flags, lnnum, fname, __return_address);
488 * No need to duplicate efforts.
490 if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
494 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
495 * queue up anybody new on the log reservations, and wakes up
496 * everybody who's sleeping on log reservations to tell them
499 if (xfs_log_force_umount(mp, logerror))
502 if (flags & SHUTDOWN_CORRUPT_INCORE) {
503 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
504 "Corruption of in-memory data detected. Shutting down filesystem");
505 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
507 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
509 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
510 "Log I/O Error Detected. Shutting down filesystem");
511 } else if (flags & SHUTDOWN_DEVICE_REQ) {
512 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
513 "All device paths lost. Shutting down filesystem");
514 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
515 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
516 "I/O Error Detected. Shutting down filesystem");
519 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
521 "Please umount the filesystem and rectify the problem(s)");
526 * Reserve free space for per-AG metadata.
529 xfs_fs_reserve_ag_blocks(
530 struct xfs_mount *mp)
533 struct xfs_perag *pag;
537 for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
538 pag = xfs_perag_get(mp, agno);
539 err2 = xfs_ag_resv_init(pag, NULL);
545 if (error && error != -ENOSPC) {
547 "Error %d reserving per-AG metadata reserve pool.", error);
548 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
555 * Free space reserved for per-AG metadata.
558 xfs_fs_unreserve_ag_blocks(
559 struct xfs_mount *mp)
562 struct xfs_perag *pag;
566 for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
567 pag = xfs_perag_get(mp, agno);
568 err2 = xfs_ag_resv_free(pag);
576 "Error %d freeing per-AG metadata reserve pool.", error);