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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 */
37static int
38xfs_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(&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 */
85static int
86xfs_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 /* No work to do */
138 if (delta == 0)
139 return 0;
140
141 oagcount = mp->m_sb.sb_agcount;
142 /* allocate the new per-ag structures */
143 if (nagcount > oagcount) {
144 error = xfs_initialize_perag(mp, nagcount, nb, &nagimax);
145 if (error)
146 return error;
147 } else if (nagcount < oagcount) {
148 /* TODO: shrinking the entire AGs hasn't yet completed */
149 return -EINVAL;
150 }
151
152 if (delta > 0)
153 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
154 XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE,
155 &tp);
156 else
157 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata, -delta, 0,
158 0, &tp);
159 if (error)
160 goto out_free_unused_perag;
161
162 last_pag = xfs_perag_get(mp, oagcount - 1);
163 if (delta > 0) {
164 error = xfs_resizefs_init_new_ags(tp, &id, oagcount, nagcount,
165 delta, last_pag, &lastag_extended);
166 } else {
167 xfs_warn_mount(mp, XFS_OPSTATE_WARNED_SHRINK,
168 "EXPERIMENTAL online shrink feature in use. Use at your own risk!");
169
170 error = xfs_ag_shrink_space(last_pag, &tp, -delta);
171 }
172 xfs_perag_put(last_pag);
173 if (error)
174 goto out_trans_cancel;
175
176 /*
177 * Update changed superblock fields transactionally. These are not
178 * seen by the rest of the world until the transaction commit applies
179 * them atomically to the superblock.
180 */
181 if (nagcount > oagcount)
182 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
183 if (delta)
184 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, delta);
185 if (id.nfree)
186 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, id.nfree);
187
188 /*
189 * Sync sb counters now to reflect the updated values. This is
190 * particularly important for shrink because the write verifier
191 * will fail if sb_fdblocks is ever larger than sb_dblocks.
192 */
193 if (xfs_has_lazysbcount(mp))
194 xfs_log_sb(tp);
195
196 xfs_trans_set_sync(tp);
197 error = xfs_trans_commit(tp);
198 if (error)
199 return error;
200
201 /* New allocation groups fully initialized, so update mount struct */
202 if (nagimax)
203 mp->m_maxagi = nagimax;
204 xfs_set_low_space_thresholds(mp);
205 mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
206
207 if (delta > 0) {
208 /*
209 * If we expanded the last AG, free the per-AG reservation
210 * so we can reinitialize it with the new size.
211 */
212 if (lastag_extended) {
213 struct xfs_perag *pag;
214
215 pag = xfs_perag_get(mp, id.agno);
216 error = xfs_ag_resv_free(pag);
217 xfs_perag_put(pag);
218 if (error)
219 return error;
220 }
221 /*
222 * Reserve AG metadata blocks. ENOSPC here does not mean there
223 * was a growfs failure, just that there still isn't space for
224 * new user data after the grow has been run.
225 */
226 error = xfs_fs_reserve_ag_blocks(mp);
227 if (error == -ENOSPC)
228 error = 0;
229 }
230 return error;
231
232out_trans_cancel:
233 xfs_trans_cancel(tp);
234out_free_unused_perag:
235 if (nagcount > oagcount)
236 xfs_free_unused_perag_range(mp, oagcount, nagcount);
237 return error;
238}
239
240static int
241xfs_growfs_log_private(
242 struct xfs_mount *mp, /* mount point for filesystem */
243 struct xfs_growfs_log *in) /* growfs log input struct */
244{
245 xfs_extlen_t nb;
246
247 nb = in->newblocks;
248 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
249 return -EINVAL;
250 if (nb == mp->m_sb.sb_logblocks &&
251 in->isint == (mp->m_sb.sb_logstart != 0))
252 return -EINVAL;
253 /*
254 * Moving the log is hard, need new interfaces to sync
255 * the log first, hold off all activity while moving it.
256 * Can have shorter or longer log in the same space,
257 * or transform internal to external log or vice versa.
258 */
259 return -ENOSYS;
260}
261
262static int
263xfs_growfs_imaxpct(
264 struct xfs_mount *mp,
265 __u32 imaxpct)
266{
267 struct xfs_trans *tp;
268 int dpct;
269 int error;
270
271 if (imaxpct > 100)
272 return -EINVAL;
273
274 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
275 XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp);
276 if (error)
277 return error;
278
279 dpct = imaxpct - mp->m_sb.sb_imax_pct;
280 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
281 xfs_trans_set_sync(tp);
282 return xfs_trans_commit(tp);
283}
284
285/*
286 * protected versions of growfs function acquire and release locks on the mount
287 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
288 * XFS_IOC_FSGROWFSRT
289 */
290int
291xfs_growfs_data(
292 struct xfs_mount *mp,
293 struct xfs_growfs_data *in)
294{
295 int error = 0;
296
297 if (!capable(CAP_SYS_ADMIN))
298 return -EPERM;
299 if (!mutex_trylock(&mp->m_growlock))
300 return -EWOULDBLOCK;
301
302 /* update imaxpct separately to the physical grow of the filesystem */
303 if (in->imaxpct != mp->m_sb.sb_imax_pct) {
304 error = xfs_growfs_imaxpct(mp, in->imaxpct);
305 if (error)
306 goto out_error;
307 }
308
309 if (in->newblocks != mp->m_sb.sb_dblocks) {
310 error = xfs_growfs_data_private(mp, in);
311 if (error)
312 goto out_error;
313 }
314
315 /* Post growfs calculations needed to reflect new state in operations */
316 if (mp->m_sb.sb_imax_pct) {
317 uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
318 do_div(icount, 100);
319 M_IGEO(mp)->maxicount = XFS_FSB_TO_INO(mp, icount);
320 } else
321 M_IGEO(mp)->maxicount = 0;
322
323 /* Update secondary superblocks now the physical grow has completed */
324 error = xfs_update_secondary_sbs(mp);
325
326out_error:
327 /*
328 * Increment the generation unconditionally, the error could be from
329 * updating the secondary superblocks, in which case the new size
330 * is live already.
331 */
332 mp->m_generation++;
333 mutex_unlock(&mp->m_growlock);
334 return error;
335}
336
337int
338xfs_growfs_log(
339 xfs_mount_t *mp,
340 struct xfs_growfs_log *in)
341{
342 int error;
343
344 if (!capable(CAP_SYS_ADMIN))
345 return -EPERM;
346 if (!mutex_trylock(&mp->m_growlock))
347 return -EWOULDBLOCK;
348 error = xfs_growfs_log_private(mp, in);
349 mutex_unlock(&mp->m_growlock);
350 return error;
351}
352
353/*
354 * Reserve the requested number of blocks if available. Otherwise return
355 * as many as possible to satisfy the request. The actual number
356 * reserved are returned in outval.
357 */
358int
359xfs_reserve_blocks(
360 struct xfs_mount *mp,
361 uint64_t request)
362{
363 int64_t lcounter, delta;
364 int64_t fdblks_delta = 0;
365 int64_t free;
366 int error = 0;
367
368 /*
369 * With per-cpu counters, this becomes an interesting problem. we need
370 * to work out if we are freeing or allocation blocks first, then we can
371 * do the modification as necessary.
372 *
373 * We do this under the m_sb_lock so that if we are near ENOSPC, we will
374 * hold out any changes while we work out what to do. This means that
375 * the amount of free space can change while we do this, so we need to
376 * retry if we end up trying to reserve more space than is available.
377 */
378 spin_lock(&mp->m_sb_lock);
379
380 /*
381 * If our previous reservation was larger than the current value,
382 * then move any unused blocks back to the free pool. Modify the resblks
383 * counters directly since we shouldn't have any problems unreserving
384 * space.
385 */
386 if (mp->m_resblks > request) {
387 lcounter = mp->m_resblks_avail - request;
388 if (lcounter > 0) { /* release unused blocks */
389 fdblks_delta = lcounter;
390 mp->m_resblks_avail -= lcounter;
391 }
392 mp->m_resblks = request;
393 if (fdblks_delta) {
394 spin_unlock(&mp->m_sb_lock);
395 error = xfs_mod_fdblocks(mp, fdblks_delta, 0);
396 spin_lock(&mp->m_sb_lock);
397 }
398
399 goto out;
400 }
401
402 /*
403 * If the request is larger than the current reservation, reserve the
404 * blocks before we update the reserve counters. Sample m_fdblocks and
405 * perform a partial reservation if the request exceeds free space.
406 *
407 * The code below estimates how many blocks it can request from
408 * fdblocks to stash in the reserve pool. This is a classic TOCTOU
409 * race since fdblocks updates are not always coordinated via
410 * m_sb_lock. Set the reserve size even if there's not enough free
411 * space to fill it because mod_fdblocks will refill an undersized
412 * reserve when it can.
413 */
414 free = percpu_counter_sum(&mp->m_fdblocks) -
415 xfs_fdblocks_unavailable(mp);
416 delta = request - mp->m_resblks;
417 mp->m_resblks = request;
418 if (delta > 0 && free > 0) {
419 /*
420 * We'll either succeed in getting space from the free block
421 * count or we'll get an ENOSPC. Don't set the reserved flag
422 * here - we don't want to reserve the extra reserve blocks
423 * from the reserve.
424 *
425 * The desired reserve size can change after we drop the lock.
426 * Use mod_fdblocks to put the space into the reserve or into
427 * fdblocks as appropriate.
428 */
429 fdblks_delta = min(free, delta);
430 spin_unlock(&mp->m_sb_lock);
431 error = xfs_mod_fdblocks(mp, -fdblks_delta, 0);
432 if (!error)
433 xfs_mod_fdblocks(mp, fdblks_delta, 0);
434 spin_lock(&mp->m_sb_lock);
435 }
436out:
437 spin_unlock(&mp->m_sb_lock);
438 return error;
439}
440
441int
442xfs_fs_goingdown(
443 xfs_mount_t *mp,
444 uint32_t inflags)
445{
446 switch (inflags) {
447 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
448 if (!bdev_freeze(mp->m_super->s_bdev)) {
449 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
450 bdev_thaw(mp->m_super->s_bdev);
451 }
452 break;
453 }
454 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
455 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
456 break;
457 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
458 xfs_force_shutdown(mp,
459 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
460 break;
461 default:
462 return -EINVAL;
463 }
464
465 return 0;
466}
467
468/*
469 * Force a shutdown of the filesystem instantly while keeping the filesystem
470 * consistent. We don't do an unmount here; just shutdown the shop, make sure
471 * that absolutely nothing persistent happens to this filesystem after this
472 * point.
473 *
474 * The shutdown state change is atomic, resulting in the first and only the
475 * first shutdown call processing the shutdown. This means we only shutdown the
476 * log once as it requires, and we don't spam the logs when multiple concurrent
477 * shutdowns race to set the shutdown flags.
478 */
479void
480xfs_do_force_shutdown(
481 struct xfs_mount *mp,
482 uint32_t flags,
483 char *fname,
484 int lnnum)
485{
486 int tag;
487 const char *why;
488
489
490 if (test_and_set_bit(XFS_OPSTATE_SHUTDOWN, &mp->m_opstate)) {
491 xlog_shutdown_wait(mp->m_log);
492 return;
493 }
494 if (mp->m_sb_bp)
495 mp->m_sb_bp->b_flags |= XBF_DONE;
496
497 if (flags & SHUTDOWN_FORCE_UMOUNT)
498 xfs_alert(mp, "User initiated shutdown received.");
499
500 if (xlog_force_shutdown(mp->m_log, flags)) {
501 tag = XFS_PTAG_SHUTDOWN_LOGERROR;
502 why = "Log I/O Error";
503 } else if (flags & SHUTDOWN_CORRUPT_INCORE) {
504 tag = XFS_PTAG_SHUTDOWN_CORRUPT;
505 why = "Corruption of in-memory data";
506 } else if (flags & SHUTDOWN_CORRUPT_ONDISK) {
507 tag = XFS_PTAG_SHUTDOWN_CORRUPT;
508 why = "Corruption of on-disk metadata";
509 } else if (flags & SHUTDOWN_DEVICE_REMOVED) {
510 tag = XFS_PTAG_SHUTDOWN_IOERROR;
511 why = "Block device removal";
512 } else {
513 tag = XFS_PTAG_SHUTDOWN_IOERROR;
514 why = "Metadata I/O Error";
515 }
516
517 trace_xfs_force_shutdown(mp, tag, flags, fname, lnnum);
518
519 xfs_alert_tag(mp, tag,
520"%s (0x%x) detected at %pS (%s:%d). Shutting down filesystem.",
521 why, flags, __return_address, fname, lnnum);
522 xfs_alert(mp,
523 "Please unmount the filesystem and rectify the problem(s)");
524 if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
525 xfs_stack_trace();
526}
527
528/*
529 * Reserve free space for per-AG metadata.
530 */
531int
532xfs_fs_reserve_ag_blocks(
533 struct xfs_mount *mp)
534{
535 xfs_agnumber_t agno;
536 struct xfs_perag *pag;
537 int error = 0;
538 int err2;
539
540 mp->m_finobt_nores = false;
541 for_each_perag(mp, agno, pag) {
542 err2 = xfs_ag_resv_init(pag, NULL);
543 if (err2 && !error)
544 error = err2;
545 }
546
547 if (error && error != -ENOSPC) {
548 xfs_warn(mp,
549 "Error %d reserving per-AG metadata reserve pool.", error);
550 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
551 }
552
553 return error;
554}
555
556/*
557 * Free space reserved for per-AG metadata.
558 */
559int
560xfs_fs_unreserve_ag_blocks(
561 struct xfs_mount *mp)
562{
563 xfs_agnumber_t agno;
564 struct xfs_perag *pag;
565 int error = 0;
566 int err2;
567
568 for_each_perag(mp, agno, pag) {
569 err2 = xfs_ag_resv_free(pag);
570 if (err2 && !error)
571 error = err2;
572 }
573
574 if (error)
575 xfs_warn(mp,
576 "Error %d freeing per-AG metadata reserve pool.", error);
577
578 return error;
579}
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_shared.h"
21#include "xfs_format.h"
22#include "xfs_log_format.h"
23#include "xfs_trans_resv.h"
24#include "xfs_sb.h"
25#include "xfs_mount.h"
26#include "xfs_defer.h"
27#include "xfs_da_format.h"
28#include "xfs_da_btree.h"
29#include "xfs_inode.h"
30#include "xfs_trans.h"
31#include "xfs_inode_item.h"
32#include "xfs_error.h"
33#include "xfs_btree.h"
34#include "xfs_alloc_btree.h"
35#include "xfs_alloc.h"
36#include "xfs_rmap_btree.h"
37#include "xfs_ialloc.h"
38#include "xfs_fsops.h"
39#include "xfs_itable.h"
40#include "xfs_trans_space.h"
41#include "xfs_rtalloc.h"
42#include "xfs_trace.h"
43#include "xfs_log.h"
44#include "xfs_filestream.h"
45#include "xfs_rmap.h"
46#include "xfs_ag_resv.h"
47
48/*
49 * File system operations
50 */
51
52static struct xfs_buf *
53xfs_growfs_get_hdr_buf(
54 struct xfs_mount *mp,
55 xfs_daddr_t blkno,
56 size_t numblks,
57 int flags,
58 const struct xfs_buf_ops *ops)
59{
60 struct xfs_buf *bp;
61
62 bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
63 if (!bp)
64 return NULL;
65
66 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
67 bp->b_bn = blkno;
68 bp->b_maps[0].bm_bn = blkno;
69 bp->b_ops = ops;
70
71 return bp;
72}
73
74static int
75xfs_growfs_data_private(
76 xfs_mount_t *mp, /* mount point for filesystem */
77 xfs_growfs_data_t *in) /* growfs data input struct */
78{
79 xfs_agf_t *agf;
80 struct xfs_agfl *agfl;
81 xfs_agi_t *agi;
82 xfs_agnumber_t agno;
83 xfs_extlen_t agsize;
84 xfs_extlen_t tmpsize;
85 xfs_alloc_rec_t *arec;
86 xfs_buf_t *bp;
87 int bucket;
88 int dpct;
89 int error, saved_error = 0;
90 xfs_agnumber_t nagcount;
91 xfs_agnumber_t nagimax = 0;
92 xfs_rfsblock_t nb, nb_mod;
93 xfs_rfsblock_t new;
94 xfs_rfsblock_t nfree;
95 xfs_agnumber_t oagcount;
96 int pct;
97 xfs_trans_t *tp;
98
99 nb = in->newblocks;
100 pct = in->imaxpct;
101 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
102 return -EINVAL;
103 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
104 return error;
105 dpct = pct - mp->m_sb.sb_imax_pct;
106 error = xfs_buf_read_uncached(mp->m_ddev_targp,
107 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
108 XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);
109 if (error)
110 return error;
111 xfs_buf_relse(bp);
112
113 new = nb; /* use new as a temporary here */
114 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
115 nagcount = new + (nb_mod != 0);
116 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
117 nagcount--;
118 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
119 if (nb < mp->m_sb.sb_dblocks)
120 return -EINVAL;
121 }
122 new = nb - mp->m_sb.sb_dblocks;
123 oagcount = mp->m_sb.sb_agcount;
124
125 /* allocate the new per-ag structures */
126 if (nagcount > oagcount) {
127 error = xfs_initialize_perag(mp, nagcount, &nagimax);
128 if (error)
129 return error;
130 }
131
132 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
133 XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp);
134 if (error)
135 return error;
136
137 /*
138 * Write new AG headers to disk. Non-transactional, but written
139 * synchronously so they are completed prior to the growfs transaction
140 * being logged.
141 */
142 nfree = 0;
143 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
144 __be32 *agfl_bno;
145
146 /*
147 * AG freespace header block
148 */
149 bp = xfs_growfs_get_hdr_buf(mp,
150 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
151 XFS_FSS_TO_BB(mp, 1), 0,
152 &xfs_agf_buf_ops);
153 if (!bp) {
154 error = -ENOMEM;
155 goto error0;
156 }
157
158 agf = XFS_BUF_TO_AGF(bp);
159 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
160 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
161 agf->agf_seqno = cpu_to_be32(agno);
162 if (agno == nagcount - 1)
163 agsize =
164 nb -
165 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
166 else
167 agsize = mp->m_sb.sb_agblocks;
168 agf->agf_length = cpu_to_be32(agsize);
169 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
170 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
171 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
172 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
173 if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
174 agf->agf_roots[XFS_BTNUM_RMAPi] =
175 cpu_to_be32(XFS_RMAP_BLOCK(mp));
176 agf->agf_levels[XFS_BTNUM_RMAPi] = cpu_to_be32(1);
177 agf->agf_rmap_blocks = cpu_to_be32(1);
178 }
179
180 agf->agf_flfirst = cpu_to_be32(1);
181 agf->agf_fllast = 0;
182 agf->agf_flcount = 0;
183 tmpsize = agsize - mp->m_ag_prealloc_blocks;
184 agf->agf_freeblks = cpu_to_be32(tmpsize);
185 agf->agf_longest = cpu_to_be32(tmpsize);
186 if (xfs_sb_version_hascrc(&mp->m_sb))
187 uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid);
188 if (xfs_sb_version_hasreflink(&mp->m_sb)) {
189 agf->agf_refcount_root = cpu_to_be32(
190 xfs_refc_block(mp));
191 agf->agf_refcount_level = cpu_to_be32(1);
192 agf->agf_refcount_blocks = cpu_to_be32(1);
193 }
194
195 error = xfs_bwrite(bp);
196 xfs_buf_relse(bp);
197 if (error)
198 goto error0;
199
200 /*
201 * AG freelist header block
202 */
203 bp = xfs_growfs_get_hdr_buf(mp,
204 XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)),
205 XFS_FSS_TO_BB(mp, 1), 0,
206 &xfs_agfl_buf_ops);
207 if (!bp) {
208 error = -ENOMEM;
209 goto error0;
210 }
211
212 agfl = XFS_BUF_TO_AGFL(bp);
213 if (xfs_sb_version_hascrc(&mp->m_sb)) {
214 agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
215 agfl->agfl_seqno = cpu_to_be32(agno);
216 uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid);
217 }
218
219 agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
220 for (bucket = 0; bucket < xfs_agfl_size(mp); bucket++)
221 agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
222
223 error = xfs_bwrite(bp);
224 xfs_buf_relse(bp);
225 if (error)
226 goto error0;
227
228 /*
229 * AG inode header block
230 */
231 bp = xfs_growfs_get_hdr_buf(mp,
232 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
233 XFS_FSS_TO_BB(mp, 1), 0,
234 &xfs_agi_buf_ops);
235 if (!bp) {
236 error = -ENOMEM;
237 goto error0;
238 }
239
240 agi = XFS_BUF_TO_AGI(bp);
241 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
242 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
243 agi->agi_seqno = cpu_to_be32(agno);
244 agi->agi_length = cpu_to_be32(agsize);
245 agi->agi_count = 0;
246 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
247 agi->agi_level = cpu_to_be32(1);
248 agi->agi_freecount = 0;
249 agi->agi_newino = cpu_to_be32(NULLAGINO);
250 agi->agi_dirino = cpu_to_be32(NULLAGINO);
251 if (xfs_sb_version_hascrc(&mp->m_sb))
252 uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid);
253 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
254 agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp));
255 agi->agi_free_level = cpu_to_be32(1);
256 }
257 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
258 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
259
260 error = xfs_bwrite(bp);
261 xfs_buf_relse(bp);
262 if (error)
263 goto error0;
264
265 /*
266 * BNO btree root block
267 */
268 bp = xfs_growfs_get_hdr_buf(mp,
269 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
270 BTOBB(mp->m_sb.sb_blocksize), 0,
271 &xfs_allocbt_buf_ops);
272
273 if (!bp) {
274 error = -ENOMEM;
275 goto error0;
276 }
277
278 xfs_btree_init_block(mp, bp, XFS_BTNUM_BNO, 0, 1, agno, 0);
279
280 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
281 arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
282 arec->ar_blockcount = cpu_to_be32(
283 agsize - be32_to_cpu(arec->ar_startblock));
284
285 error = xfs_bwrite(bp);
286 xfs_buf_relse(bp);
287 if (error)
288 goto error0;
289
290 /*
291 * CNT btree root block
292 */
293 bp = xfs_growfs_get_hdr_buf(mp,
294 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
295 BTOBB(mp->m_sb.sb_blocksize), 0,
296 &xfs_allocbt_buf_ops);
297 if (!bp) {
298 error = -ENOMEM;
299 goto error0;
300 }
301
302 xfs_btree_init_block(mp, bp, XFS_BTNUM_CNT, 0, 1, agno, 0);
303
304 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
305 arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
306 arec->ar_blockcount = cpu_to_be32(
307 agsize - be32_to_cpu(arec->ar_startblock));
308 nfree += be32_to_cpu(arec->ar_blockcount);
309
310 error = xfs_bwrite(bp);
311 xfs_buf_relse(bp);
312 if (error)
313 goto error0;
314
315 /* RMAP btree root block */
316 if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
317 struct xfs_rmap_rec *rrec;
318 struct xfs_btree_block *block;
319
320 bp = xfs_growfs_get_hdr_buf(mp,
321 XFS_AGB_TO_DADDR(mp, agno, XFS_RMAP_BLOCK(mp)),
322 BTOBB(mp->m_sb.sb_blocksize), 0,
323 &xfs_rmapbt_buf_ops);
324 if (!bp) {
325 error = -ENOMEM;
326 goto error0;
327 }
328
329 xfs_btree_init_block(mp, bp, XFS_BTNUM_RMAP, 0, 0,
330 agno, 0);
331 block = XFS_BUF_TO_BLOCK(bp);
332
333
334 /*
335 * mark the AG header regions as static metadata The BNO
336 * btree block is the first block after the headers, so
337 * it's location defines the size of region the static
338 * metadata consumes.
339 *
340 * Note: unlike mkfs, we never have to account for log
341 * space when growing the data regions
342 */
343 rrec = XFS_RMAP_REC_ADDR(block, 1);
344 rrec->rm_startblock = 0;
345 rrec->rm_blockcount = cpu_to_be32(XFS_BNO_BLOCK(mp));
346 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_FS);
347 rrec->rm_offset = 0;
348 be16_add_cpu(&block->bb_numrecs, 1);
349
350 /* account freespace btree root blocks */
351 rrec = XFS_RMAP_REC_ADDR(block, 2);
352 rrec->rm_startblock = cpu_to_be32(XFS_BNO_BLOCK(mp));
353 rrec->rm_blockcount = cpu_to_be32(2);
354 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
355 rrec->rm_offset = 0;
356 be16_add_cpu(&block->bb_numrecs, 1);
357
358 /* account inode btree root blocks */
359 rrec = XFS_RMAP_REC_ADDR(block, 3);
360 rrec->rm_startblock = cpu_to_be32(XFS_IBT_BLOCK(mp));
361 rrec->rm_blockcount = cpu_to_be32(XFS_RMAP_BLOCK(mp) -
362 XFS_IBT_BLOCK(mp));
363 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_INOBT);
364 rrec->rm_offset = 0;
365 be16_add_cpu(&block->bb_numrecs, 1);
366
367 /* account for rmap btree root */
368 rrec = XFS_RMAP_REC_ADDR(block, 4);
369 rrec->rm_startblock = cpu_to_be32(XFS_RMAP_BLOCK(mp));
370 rrec->rm_blockcount = cpu_to_be32(1);
371 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
372 rrec->rm_offset = 0;
373 be16_add_cpu(&block->bb_numrecs, 1);
374
375 /* account for refc btree root */
376 if (xfs_sb_version_hasreflink(&mp->m_sb)) {
377 rrec = XFS_RMAP_REC_ADDR(block, 5);
378 rrec->rm_startblock = cpu_to_be32(
379 xfs_refc_block(mp));
380 rrec->rm_blockcount = cpu_to_be32(1);
381 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_REFC);
382 rrec->rm_offset = 0;
383 be16_add_cpu(&block->bb_numrecs, 1);
384 }
385
386 error = xfs_bwrite(bp);
387 xfs_buf_relse(bp);
388 if (error)
389 goto error0;
390 }
391
392 /*
393 * INO btree root block
394 */
395 bp = xfs_growfs_get_hdr_buf(mp,
396 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
397 BTOBB(mp->m_sb.sb_blocksize), 0,
398 &xfs_inobt_buf_ops);
399 if (!bp) {
400 error = -ENOMEM;
401 goto error0;
402 }
403
404 xfs_btree_init_block(mp, bp, XFS_BTNUM_INO , 0, 0, agno, 0);
405
406 error = xfs_bwrite(bp);
407 xfs_buf_relse(bp);
408 if (error)
409 goto error0;
410
411 /*
412 * FINO btree root block
413 */
414 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
415 bp = xfs_growfs_get_hdr_buf(mp,
416 XFS_AGB_TO_DADDR(mp, agno, XFS_FIBT_BLOCK(mp)),
417 BTOBB(mp->m_sb.sb_blocksize), 0,
418 &xfs_inobt_buf_ops);
419 if (!bp) {
420 error = -ENOMEM;
421 goto error0;
422 }
423
424 xfs_btree_init_block(mp, bp, XFS_BTNUM_FINO,
425 0, 0, agno, 0);
426
427 error = xfs_bwrite(bp);
428 xfs_buf_relse(bp);
429 if (error)
430 goto error0;
431 }
432
433 /*
434 * refcount btree root block
435 */
436 if (xfs_sb_version_hasreflink(&mp->m_sb)) {
437 bp = xfs_growfs_get_hdr_buf(mp,
438 XFS_AGB_TO_DADDR(mp, agno, xfs_refc_block(mp)),
439 BTOBB(mp->m_sb.sb_blocksize), 0,
440 &xfs_refcountbt_buf_ops);
441 if (!bp) {
442 error = -ENOMEM;
443 goto error0;
444 }
445
446 xfs_btree_init_block(mp, bp, XFS_BTNUM_REFC,
447 0, 0, agno, 0);
448
449 error = xfs_bwrite(bp);
450 xfs_buf_relse(bp);
451 if (error)
452 goto error0;
453 }
454 }
455 xfs_trans_agblocks_delta(tp, nfree);
456 /*
457 * There are new blocks in the old last a.g.
458 */
459 if (new) {
460 struct xfs_owner_info oinfo;
461
462 /*
463 * Change the agi length.
464 */
465 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
466 if (error) {
467 goto error0;
468 }
469 ASSERT(bp);
470 agi = XFS_BUF_TO_AGI(bp);
471 be32_add_cpu(&agi->agi_length, new);
472 ASSERT(nagcount == oagcount ||
473 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
474 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
475 /*
476 * Change agf length.
477 */
478 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
479 if (error) {
480 goto error0;
481 }
482 ASSERT(bp);
483 agf = XFS_BUF_TO_AGF(bp);
484 be32_add_cpu(&agf->agf_length, new);
485 ASSERT(be32_to_cpu(agf->agf_length) ==
486 be32_to_cpu(agi->agi_length));
487
488 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
489
490 /*
491 * Free the new space.
492 *
493 * XFS_RMAP_OWN_NULL is used here to tell the rmap btree that
494 * this doesn't actually exist in the rmap btree.
495 */
496 xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_NULL);
497 error = xfs_rmap_free(tp, bp, agno,
498 be32_to_cpu(agf->agf_length) - new,
499 new, &oinfo);
500 if (error)
501 goto error0;
502 error = xfs_free_extent(tp,
503 XFS_AGB_TO_FSB(mp, agno,
504 be32_to_cpu(agf->agf_length) - new),
505 new, &oinfo, XFS_AG_RESV_NONE);
506 if (error)
507 goto error0;
508 }
509
510 /*
511 * Update changed superblock fields transactionally. These are not
512 * seen by the rest of the world until the transaction commit applies
513 * them atomically to the superblock.
514 */
515 if (nagcount > oagcount)
516 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
517 if (nb > mp->m_sb.sb_dblocks)
518 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
519 nb - mp->m_sb.sb_dblocks);
520 if (nfree)
521 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
522 if (dpct)
523 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
524 xfs_trans_set_sync(tp);
525 error = xfs_trans_commit(tp);
526 if (error)
527 return error;
528
529 /* New allocation groups fully initialized, so update mount struct */
530 if (nagimax)
531 mp->m_maxagi = nagimax;
532 if (mp->m_sb.sb_imax_pct) {
533 uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
534 do_div(icount, 100);
535 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
536 } else
537 mp->m_maxicount = 0;
538 xfs_set_low_space_thresholds(mp);
539 mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
540
541 /*
542 * If we expanded the last AG, free the per-AG reservation
543 * so we can reinitialize it with the new size.
544 */
545 if (new) {
546 struct xfs_perag *pag;
547
548 pag = xfs_perag_get(mp, agno);
549 error = xfs_ag_resv_free(pag);
550 xfs_perag_put(pag);
551 if (error)
552 goto out;
553 }
554
555 /* Reserve AG metadata blocks. */
556 error = xfs_fs_reserve_ag_blocks(mp);
557 if (error && error != -ENOSPC)
558 goto out;
559
560 /* update secondary superblocks. */
561 for (agno = 1; agno < nagcount; agno++) {
562 error = 0;
563 /*
564 * new secondary superblocks need to be zeroed, not read from
565 * disk as the contents of the new area we are growing into is
566 * completely unknown.
567 */
568 if (agno < oagcount) {
569 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
570 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
571 XFS_FSS_TO_BB(mp, 1), 0, &bp,
572 &xfs_sb_buf_ops);
573 } else {
574 bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
575 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
576 XFS_FSS_TO_BB(mp, 1), 0);
577 if (bp) {
578 bp->b_ops = &xfs_sb_buf_ops;
579 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
580 } else
581 error = -ENOMEM;
582 }
583
584 /*
585 * If we get an error reading or writing alternate superblocks,
586 * continue. xfs_repair chooses the "best" superblock based
587 * on most matches; if we break early, we'll leave more
588 * superblocks un-updated than updated, and xfs_repair may
589 * pick them over the properly-updated primary.
590 */
591 if (error) {
592 xfs_warn(mp,
593 "error %d reading secondary superblock for ag %d",
594 error, agno);
595 saved_error = error;
596 continue;
597 }
598 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
599
600 error = xfs_bwrite(bp);
601 xfs_buf_relse(bp);
602 if (error) {
603 xfs_warn(mp,
604 "write error %d updating secondary superblock for ag %d",
605 error, agno);
606 saved_error = error;
607 continue;
608 }
609 }
610
611 out:
612 return saved_error ? saved_error : error;
613
614 error0:
615 xfs_trans_cancel(tp);
616 return error;
617}
618
619static int
620xfs_growfs_log_private(
621 xfs_mount_t *mp, /* mount point for filesystem */
622 xfs_growfs_log_t *in) /* growfs log input struct */
623{
624 xfs_extlen_t nb;
625
626 nb = in->newblocks;
627 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
628 return -EINVAL;
629 if (nb == mp->m_sb.sb_logblocks &&
630 in->isint == (mp->m_sb.sb_logstart != 0))
631 return -EINVAL;
632 /*
633 * Moving the log is hard, need new interfaces to sync
634 * the log first, hold off all activity while moving it.
635 * Can have shorter or longer log in the same space,
636 * or transform internal to external log or vice versa.
637 */
638 return -ENOSYS;
639}
640
641/*
642 * protected versions of growfs function acquire and release locks on the mount
643 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
644 * XFS_IOC_FSGROWFSRT
645 */
646
647
648int
649xfs_growfs_data(
650 xfs_mount_t *mp,
651 xfs_growfs_data_t *in)
652{
653 int error;
654
655 if (!capable(CAP_SYS_ADMIN))
656 return -EPERM;
657 if (!mutex_trylock(&mp->m_growlock))
658 return -EWOULDBLOCK;
659 error = xfs_growfs_data_private(mp, in);
660 /*
661 * Increment the generation unconditionally, the error could be from
662 * updating the secondary superblocks, in which case the new size
663 * is live already.
664 */
665 mp->m_generation++;
666 mutex_unlock(&mp->m_growlock);
667 return error;
668}
669
670int
671xfs_growfs_log(
672 xfs_mount_t *mp,
673 xfs_growfs_log_t *in)
674{
675 int error;
676
677 if (!capable(CAP_SYS_ADMIN))
678 return -EPERM;
679 if (!mutex_trylock(&mp->m_growlock))
680 return -EWOULDBLOCK;
681 error = xfs_growfs_log_private(mp, in);
682 mutex_unlock(&mp->m_growlock);
683 return error;
684}
685
686/*
687 * exported through ioctl XFS_IOC_FSCOUNTS
688 */
689
690int
691xfs_fs_counts(
692 xfs_mount_t *mp,
693 xfs_fsop_counts_t *cnt)
694{
695 cnt->allocino = percpu_counter_read_positive(&mp->m_icount);
696 cnt->freeino = percpu_counter_read_positive(&mp->m_ifree);
697 cnt->freedata = percpu_counter_read_positive(&mp->m_fdblocks) -
698 mp->m_alloc_set_aside;
699
700 spin_lock(&mp->m_sb_lock);
701 cnt->freertx = mp->m_sb.sb_frextents;
702 spin_unlock(&mp->m_sb_lock);
703 return 0;
704}
705
706/*
707 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
708 *
709 * xfs_reserve_blocks is called to set m_resblks
710 * in the in-core mount table. The number of unused reserved blocks
711 * is kept in m_resblks_avail.
712 *
713 * Reserve the requested number of blocks if available. Otherwise return
714 * as many as possible to satisfy the request. The actual number
715 * reserved are returned in outval
716 *
717 * A null inval pointer indicates that only the current reserved blocks
718 * available should be returned no settings are changed.
719 */
720
721int
722xfs_reserve_blocks(
723 xfs_mount_t *mp,
724 uint64_t *inval,
725 xfs_fsop_resblks_t *outval)
726{
727 int64_t lcounter, delta;
728 int64_t fdblks_delta = 0;
729 uint64_t request;
730 int64_t free;
731 int error = 0;
732
733 /* If inval is null, report current values and return */
734 if (inval == (uint64_t *)NULL) {
735 if (!outval)
736 return -EINVAL;
737 outval->resblks = mp->m_resblks;
738 outval->resblks_avail = mp->m_resblks_avail;
739 return 0;
740 }
741
742 request = *inval;
743
744 /*
745 * With per-cpu counters, this becomes an interesting problem. we need
746 * to work out if we are freeing or allocation blocks first, then we can
747 * do the modification as necessary.
748 *
749 * We do this under the m_sb_lock so that if we are near ENOSPC, we will
750 * hold out any changes while we work out what to do. This means that
751 * the amount of free space can change while we do this, so we need to
752 * retry if we end up trying to reserve more space than is available.
753 */
754 spin_lock(&mp->m_sb_lock);
755
756 /*
757 * If our previous reservation was larger than the current value,
758 * then move any unused blocks back to the free pool. Modify the resblks
759 * counters directly since we shouldn't have any problems unreserving
760 * space.
761 */
762 if (mp->m_resblks > request) {
763 lcounter = mp->m_resblks_avail - request;
764 if (lcounter > 0) { /* release unused blocks */
765 fdblks_delta = lcounter;
766 mp->m_resblks_avail -= lcounter;
767 }
768 mp->m_resblks = request;
769 if (fdblks_delta) {
770 spin_unlock(&mp->m_sb_lock);
771 error = xfs_mod_fdblocks(mp, fdblks_delta, 0);
772 spin_lock(&mp->m_sb_lock);
773 }
774
775 goto out;
776 }
777
778 /*
779 * If the request is larger than the current reservation, reserve the
780 * blocks before we update the reserve counters. Sample m_fdblocks and
781 * perform a partial reservation if the request exceeds free space.
782 */
783 error = -ENOSPC;
784 do {
785 free = percpu_counter_sum(&mp->m_fdblocks) -
786 mp->m_alloc_set_aside;
787 if (!free)
788 break;
789
790 delta = request - mp->m_resblks;
791 lcounter = free - delta;
792 if (lcounter < 0)
793 /* We can't satisfy the request, just get what we can */
794 fdblks_delta = free;
795 else
796 fdblks_delta = delta;
797
798 /*
799 * We'll either succeed in getting space from the free block
800 * count or we'll get an ENOSPC. If we get a ENOSPC, it means
801 * things changed while we were calculating fdblks_delta and so
802 * we should try again to see if there is anything left to
803 * reserve.
804 *
805 * Don't set the reserved flag here - we don't want to reserve
806 * the extra reserve blocks from the reserve.....
807 */
808 spin_unlock(&mp->m_sb_lock);
809 error = xfs_mod_fdblocks(mp, -fdblks_delta, 0);
810 spin_lock(&mp->m_sb_lock);
811 } while (error == -ENOSPC);
812
813 /*
814 * Update the reserve counters if blocks have been successfully
815 * allocated.
816 */
817 if (!error && fdblks_delta) {
818 mp->m_resblks += fdblks_delta;
819 mp->m_resblks_avail += fdblks_delta;
820 }
821
822out:
823 if (outval) {
824 outval->resblks = mp->m_resblks;
825 outval->resblks_avail = mp->m_resblks_avail;
826 }
827
828 spin_unlock(&mp->m_sb_lock);
829 return error;
830}
831
832int
833xfs_fs_goingdown(
834 xfs_mount_t *mp,
835 uint32_t inflags)
836{
837 switch (inflags) {
838 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
839 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
840
841 if (sb && !IS_ERR(sb)) {
842 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
843 thaw_bdev(sb->s_bdev, sb);
844 }
845
846 break;
847 }
848 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
849 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
850 break;
851 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
852 xfs_force_shutdown(mp,
853 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
854 break;
855 default:
856 return -EINVAL;
857 }
858
859 return 0;
860}
861
862/*
863 * Force a shutdown of the filesystem instantly while keeping the filesystem
864 * consistent. We don't do an unmount here; just shutdown the shop, make sure
865 * that absolutely nothing persistent happens to this filesystem after this
866 * point.
867 */
868void
869xfs_do_force_shutdown(
870 xfs_mount_t *mp,
871 int flags,
872 char *fname,
873 int lnnum)
874{
875 int logerror;
876
877 logerror = flags & SHUTDOWN_LOG_IO_ERROR;
878
879 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
880 xfs_notice(mp,
881 "%s(0x%x) called from line %d of file %s. Return address = "PTR_FMT,
882 __func__, flags, lnnum, fname, __return_address);
883 }
884 /*
885 * No need to duplicate efforts.
886 */
887 if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
888 return;
889
890 /*
891 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
892 * queue up anybody new on the log reservations, and wakes up
893 * everybody who's sleeping on log reservations to tell them
894 * the bad news.
895 */
896 if (xfs_log_force_umount(mp, logerror))
897 return;
898
899 if (flags & SHUTDOWN_CORRUPT_INCORE) {
900 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
901 "Corruption of in-memory data detected. Shutting down filesystem");
902 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
903 xfs_stack_trace();
904 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
905 if (logerror) {
906 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
907 "Log I/O Error Detected. Shutting down filesystem");
908 } else if (flags & SHUTDOWN_DEVICE_REQ) {
909 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
910 "All device paths lost. Shutting down filesystem");
911 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
912 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
913 "I/O Error Detected. Shutting down filesystem");
914 }
915 }
916 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
917 xfs_alert(mp,
918 "Please umount the filesystem and rectify the problem(s)");
919 }
920}
921
922/*
923 * Reserve free space for per-AG metadata.
924 */
925int
926xfs_fs_reserve_ag_blocks(
927 struct xfs_mount *mp)
928{
929 xfs_agnumber_t agno;
930 struct xfs_perag *pag;
931 int error = 0;
932 int err2;
933
934 for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
935 pag = xfs_perag_get(mp, agno);
936 err2 = xfs_ag_resv_init(pag);
937 xfs_perag_put(pag);
938 if (err2 && !error)
939 error = err2;
940 }
941
942 if (error && error != -ENOSPC) {
943 xfs_warn(mp,
944 "Error %d reserving per-AG metadata reserve pool.", error);
945 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
946 }
947
948 return error;
949}
950
951/*
952 * Free space reserved for per-AG metadata.
953 */
954int
955xfs_fs_unreserve_ag_blocks(
956 struct xfs_mount *mp)
957{
958 xfs_agnumber_t agno;
959 struct xfs_perag *pag;
960 int error = 0;
961 int err2;
962
963 for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
964 pag = xfs_perag_get(mp, agno);
965 err2 = xfs_ag_resv_free(pag);
966 xfs_perag_put(pag);
967 if (err2 && !error)
968 error = err2;
969 }
970
971 if (error)
972 xfs_warn(mp,
973 "Error %d freeing per-AG metadata reserve pool.", error);
974
975 return error;
976}