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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_ag.h"
21#include "xfs_ag_resv.h"
22
23/*
24 * growfs operations
25 */
26static int
27xfs_growfs_data_private(
28 xfs_mount_t *mp, /* mount point for filesystem */
29 xfs_growfs_data_t *in) /* growfs data input struct */
30{
31 xfs_buf_t *bp;
32 int error;
33 xfs_agnumber_t nagcount;
34 xfs_agnumber_t nagimax = 0;
35 xfs_rfsblock_t nb, nb_mod;
36 xfs_rfsblock_t new;
37 xfs_agnumber_t oagcount;
38 xfs_trans_t *tp;
39 struct aghdr_init_data id = {};
40
41 nb = in->newblocks;
42 if (nb < mp->m_sb.sb_dblocks)
43 return -EINVAL;
44 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
45 return error;
46 error = xfs_buf_read_uncached(mp->m_ddev_targp,
47 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
48 XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);
49 if (error)
50 return error;
51 xfs_buf_relse(bp);
52
53 new = nb; /* use new as a temporary here */
54 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
55 nagcount = new + (nb_mod != 0);
56 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
57 nagcount--;
58 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
59 if (nb < mp->m_sb.sb_dblocks)
60 return -EINVAL;
61 }
62 new = nb - mp->m_sb.sb_dblocks;
63 oagcount = mp->m_sb.sb_agcount;
64
65 /* allocate the new per-ag structures */
66 if (nagcount > oagcount) {
67 error = xfs_initialize_perag(mp, nagcount, &nagimax);
68 if (error)
69 return error;
70 }
71
72 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
73 XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp);
74 if (error)
75 return error;
76
77 /*
78 * Write new AG headers to disk. Non-transactional, but need to be
79 * written and completed prior to the growfs transaction being logged.
80 * To do this, we use a delayed write buffer list and wait for
81 * submission and IO completion of the list as a whole. This allows the
82 * IO subsystem to merge all the AG headers in a single AG into a single
83 * IO and hide most of the latency of the IO from us.
84 *
85 * This also means that if we get an error whilst building the buffer
86 * list to write, we can cancel the entire list without having written
87 * anything.
88 */
89 INIT_LIST_HEAD(&id.buffer_list);
90 for (id.agno = nagcount - 1;
91 id.agno >= oagcount;
92 id.agno--, new -= id.agsize) {
93
94 if (id.agno == nagcount - 1)
95 id.agsize = nb -
96 (id.agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
97 else
98 id.agsize = mp->m_sb.sb_agblocks;
99
100 error = xfs_ag_init_headers(mp, &id);
101 if (error) {
102 xfs_buf_delwri_cancel(&id.buffer_list);
103 goto out_trans_cancel;
104 }
105 }
106 error = xfs_buf_delwri_submit(&id.buffer_list);
107 if (error)
108 goto out_trans_cancel;
109
110 xfs_trans_agblocks_delta(tp, id.nfree);
111
112 /* If there are new blocks in the old last AG, extend it. */
113 if (new) {
114 error = xfs_ag_extend_space(mp, tp, &id, new);
115 if (error)
116 goto out_trans_cancel;
117 }
118
119 /*
120 * Update changed superblock fields transactionally. These are not
121 * seen by the rest of the world until the transaction commit applies
122 * them atomically to the superblock.
123 */
124 if (nagcount > oagcount)
125 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
126 if (nb > mp->m_sb.sb_dblocks)
127 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
128 nb - mp->m_sb.sb_dblocks);
129 if (id.nfree)
130 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, id.nfree);
131 xfs_trans_set_sync(tp);
132 error = xfs_trans_commit(tp);
133 if (error)
134 return error;
135
136 /* New allocation groups fully initialized, so update mount struct */
137 if (nagimax)
138 mp->m_maxagi = nagimax;
139 xfs_set_low_space_thresholds(mp);
140 mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
141
142 /*
143 * If we expanded the last AG, free the per-AG reservation
144 * so we can reinitialize it with the new size.
145 */
146 if (new) {
147 struct xfs_perag *pag;
148
149 pag = xfs_perag_get(mp, id.agno);
150 error = xfs_ag_resv_free(pag);
151 xfs_perag_put(pag);
152 if (error)
153 return error;
154 }
155
156 /*
157 * Reserve AG metadata blocks. ENOSPC here does not mean there was a
158 * growfs failure, just that there still isn't space for new user data
159 * after the grow has been run.
160 */
161 error = xfs_fs_reserve_ag_blocks(mp);
162 if (error == -ENOSPC)
163 error = 0;
164 return error;
165
166out_trans_cancel:
167 xfs_trans_cancel(tp);
168 return error;
169}
170
171static int
172xfs_growfs_log_private(
173 xfs_mount_t *mp, /* mount point for filesystem */
174 xfs_growfs_log_t *in) /* growfs log input struct */
175{
176 xfs_extlen_t nb;
177
178 nb = in->newblocks;
179 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
180 return -EINVAL;
181 if (nb == mp->m_sb.sb_logblocks &&
182 in->isint == (mp->m_sb.sb_logstart != 0))
183 return -EINVAL;
184 /*
185 * Moving the log is hard, need new interfaces to sync
186 * the log first, hold off all activity while moving it.
187 * Can have shorter or longer log in the same space,
188 * or transform internal to external log or vice versa.
189 */
190 return -ENOSYS;
191}
192
193static int
194xfs_growfs_imaxpct(
195 struct xfs_mount *mp,
196 __u32 imaxpct)
197{
198 struct xfs_trans *tp;
199 int dpct;
200 int error;
201
202 if (imaxpct > 100)
203 return -EINVAL;
204
205 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
206 XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp);
207 if (error)
208 return error;
209
210 dpct = imaxpct - mp->m_sb.sb_imax_pct;
211 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
212 xfs_trans_set_sync(tp);
213 return xfs_trans_commit(tp);
214}
215
216/*
217 * protected versions of growfs function acquire and release locks on the mount
218 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
219 * XFS_IOC_FSGROWFSRT
220 */
221int
222xfs_growfs_data(
223 struct xfs_mount *mp,
224 struct xfs_growfs_data *in)
225{
226 int error = 0;
227
228 if (!capable(CAP_SYS_ADMIN))
229 return -EPERM;
230 if (!mutex_trylock(&mp->m_growlock))
231 return -EWOULDBLOCK;
232
233 /* update imaxpct separately to the physical grow of the filesystem */
234 if (in->imaxpct != mp->m_sb.sb_imax_pct) {
235 error = xfs_growfs_imaxpct(mp, in->imaxpct);
236 if (error)
237 goto out_error;
238 }
239
240 if (in->newblocks != mp->m_sb.sb_dblocks) {
241 error = xfs_growfs_data_private(mp, in);
242 if (error)
243 goto out_error;
244 }
245
246 /* Post growfs calculations needed to reflect new state in operations */
247 if (mp->m_sb.sb_imax_pct) {
248 uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
249 do_div(icount, 100);
250 M_IGEO(mp)->maxicount = XFS_FSB_TO_INO(mp, icount);
251 } else
252 M_IGEO(mp)->maxicount = 0;
253
254 /* Update secondary superblocks now the physical grow has completed */
255 error = xfs_update_secondary_sbs(mp);
256
257out_error:
258 /*
259 * Increment the generation unconditionally, the error could be from
260 * updating the secondary superblocks, in which case the new size
261 * is live already.
262 */
263 mp->m_generation++;
264 mutex_unlock(&mp->m_growlock);
265 return error;
266}
267
268int
269xfs_growfs_log(
270 xfs_mount_t *mp,
271 xfs_growfs_log_t *in)
272{
273 int error;
274
275 if (!capable(CAP_SYS_ADMIN))
276 return -EPERM;
277 if (!mutex_trylock(&mp->m_growlock))
278 return -EWOULDBLOCK;
279 error = xfs_growfs_log_private(mp, in);
280 mutex_unlock(&mp->m_growlock);
281 return error;
282}
283
284/*
285 * exported through ioctl XFS_IOC_FSCOUNTS
286 */
287
288void
289xfs_fs_counts(
290 xfs_mount_t *mp,
291 xfs_fsop_counts_t *cnt)
292{
293 cnt->allocino = percpu_counter_read_positive(&mp->m_icount);
294 cnt->freeino = percpu_counter_read_positive(&mp->m_ifree);
295 cnt->freedata = percpu_counter_read_positive(&mp->m_fdblocks) -
296 mp->m_alloc_set_aside;
297
298 spin_lock(&mp->m_sb_lock);
299 cnt->freertx = mp->m_sb.sb_frextents;
300 spin_unlock(&mp->m_sb_lock);
301}
302
303/*
304 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
305 *
306 * xfs_reserve_blocks is called to set m_resblks
307 * in the in-core mount table. The number of unused reserved blocks
308 * is kept in m_resblks_avail.
309 *
310 * Reserve the requested number of blocks if available. Otherwise return
311 * as many as possible to satisfy the request. The actual number
312 * reserved are returned in outval
313 *
314 * A null inval pointer indicates that only the current reserved blocks
315 * available should be returned no settings are changed.
316 */
317
318int
319xfs_reserve_blocks(
320 xfs_mount_t *mp,
321 uint64_t *inval,
322 xfs_fsop_resblks_t *outval)
323{
324 int64_t lcounter, delta;
325 int64_t fdblks_delta = 0;
326 uint64_t request;
327 int64_t free;
328 int error = 0;
329
330 /* If inval is null, report current values and return */
331 if (inval == (uint64_t *)NULL) {
332 if (!outval)
333 return -EINVAL;
334 outval->resblks = mp->m_resblks;
335 outval->resblks_avail = mp->m_resblks_avail;
336 return 0;
337 }
338
339 request = *inval;
340
341 /*
342 * With per-cpu counters, this becomes an interesting problem. we need
343 * to work out if we are freeing or allocation blocks first, then we can
344 * do the modification as necessary.
345 *
346 * We do this under the m_sb_lock so that if we are near ENOSPC, we will
347 * hold out any changes while we work out what to do. This means that
348 * the amount of free space can change while we do this, so we need to
349 * retry if we end up trying to reserve more space than is available.
350 */
351 spin_lock(&mp->m_sb_lock);
352
353 /*
354 * If our previous reservation was larger than the current value,
355 * then move any unused blocks back to the free pool. Modify the resblks
356 * counters directly since we shouldn't have any problems unreserving
357 * space.
358 */
359 if (mp->m_resblks > request) {
360 lcounter = mp->m_resblks_avail - request;
361 if (lcounter > 0) { /* release unused blocks */
362 fdblks_delta = lcounter;
363 mp->m_resblks_avail -= lcounter;
364 }
365 mp->m_resblks = request;
366 if (fdblks_delta) {
367 spin_unlock(&mp->m_sb_lock);
368 error = xfs_mod_fdblocks(mp, fdblks_delta, 0);
369 spin_lock(&mp->m_sb_lock);
370 }
371
372 goto out;
373 }
374
375 /*
376 * If the request is larger than the current reservation, reserve the
377 * blocks before we update the reserve counters. Sample m_fdblocks and
378 * perform a partial reservation if the request exceeds free space.
379 */
380 error = -ENOSPC;
381 do {
382 free = percpu_counter_sum(&mp->m_fdblocks) -
383 mp->m_alloc_set_aside;
384 if (free <= 0)
385 break;
386
387 delta = request - mp->m_resblks;
388 lcounter = free - delta;
389 if (lcounter < 0)
390 /* We can't satisfy the request, just get what we can */
391 fdblks_delta = free;
392 else
393 fdblks_delta = delta;
394
395 /*
396 * We'll either succeed in getting space from the free block
397 * count or we'll get an ENOSPC. If we get a ENOSPC, it means
398 * things changed while we were calculating fdblks_delta and so
399 * we should try again to see if there is anything left to
400 * reserve.
401 *
402 * Don't set the reserved flag here - we don't want to reserve
403 * the extra reserve blocks from the reserve.....
404 */
405 spin_unlock(&mp->m_sb_lock);
406 error = xfs_mod_fdblocks(mp, -fdblks_delta, 0);
407 spin_lock(&mp->m_sb_lock);
408 } while (error == -ENOSPC);
409
410 /*
411 * Update the reserve counters if blocks have been successfully
412 * allocated.
413 */
414 if (!error && fdblks_delta) {
415 mp->m_resblks += fdblks_delta;
416 mp->m_resblks_avail += fdblks_delta;
417 }
418
419out:
420 if (outval) {
421 outval->resblks = mp->m_resblks;
422 outval->resblks_avail = mp->m_resblks_avail;
423 }
424
425 spin_unlock(&mp->m_sb_lock);
426 return error;
427}
428
429int
430xfs_fs_goingdown(
431 xfs_mount_t *mp,
432 uint32_t inflags)
433{
434 switch (inflags) {
435 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
436 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
437
438 if (sb && !IS_ERR(sb)) {
439 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
440 thaw_bdev(sb->s_bdev, sb);
441 }
442
443 break;
444 }
445 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
446 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
447 break;
448 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
449 xfs_force_shutdown(mp,
450 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
451 break;
452 default:
453 return -EINVAL;
454 }
455
456 return 0;
457}
458
459/*
460 * Force a shutdown of the filesystem instantly while keeping the filesystem
461 * consistent. We don't do an unmount here; just shutdown the shop, make sure
462 * that absolutely nothing persistent happens to this filesystem after this
463 * point.
464 */
465void
466xfs_do_force_shutdown(
467 struct xfs_mount *mp,
468 int flags,
469 char *fname,
470 int lnnum)
471{
472 bool logerror = flags & SHUTDOWN_LOG_IO_ERROR;
473
474 /*
475 * No need to duplicate efforts.
476 */
477 if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
478 return;
479
480 /*
481 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
482 * queue up anybody new on the log reservations, and wakes up
483 * everybody who's sleeping on log reservations to tell them
484 * the bad news.
485 */
486 if (xfs_log_force_umount(mp, logerror))
487 return;
488
489 if (flags & SHUTDOWN_FORCE_UMOUNT) {
490 xfs_alert(mp,
491"User initiated shutdown received. Shutting down filesystem");
492 return;
493 }
494
495 xfs_notice(mp,
496"%s(0x%x) called from line %d of file %s. Return address = "PTR_FMT,
497 __func__, flags, lnnum, fname, __return_address);
498
499 if (flags & SHUTDOWN_CORRUPT_INCORE) {
500 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
501"Corruption of in-memory data detected. Shutting down filesystem");
502 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
503 xfs_stack_trace();
504 } else if (logerror) {
505 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
506 "Log I/O Error Detected. Shutting down filesystem");
507 } else {
508 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
509 "I/O Error Detected. Shutting down filesystem");
510 }
511
512 xfs_alert(mp,
513 "Please unmount the filesystem and rectify the problem(s)");
514}
515
516/*
517 * Reserve free space for per-AG metadata.
518 */
519int
520xfs_fs_reserve_ag_blocks(
521 struct xfs_mount *mp)
522{
523 xfs_agnumber_t agno;
524 struct xfs_perag *pag;
525 int error = 0;
526 int err2;
527
528 mp->m_finobt_nores = false;
529 for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
530 pag = xfs_perag_get(mp, agno);
531 err2 = xfs_ag_resv_init(pag, NULL);
532 xfs_perag_put(pag);
533 if (err2 && !error)
534 error = err2;
535 }
536
537 if (error && error != -ENOSPC) {
538 xfs_warn(mp,
539 "Error %d reserving per-AG metadata reserve pool.", error);
540 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
541 }
542
543 return error;
544}
545
546/*
547 * Free space reserved for per-AG metadata.
548 */
549int
550xfs_fs_unreserve_ag_blocks(
551 struct xfs_mount *mp)
552{
553 xfs_agnumber_t agno;
554 struct xfs_perag *pag;
555 int error = 0;
556 int err2;
557
558 for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
559 pag = xfs_perag_get(mp, agno);
560 err2 = xfs_ag_resv_free(pag);
561 xfs_perag_put(pag);
562 if (err2 && !error)
563 error = err2;
564 }
565
566 if (error)
567 xfs_warn(mp,
568 "Error %d freeing per-AG metadata reserve pool.", error);
569
570 return error;
571}
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_ag.h"
21#include "xfs_ag_resv.h"
22
23/*
24 * Write new AG headers to disk. Non-transactional, but need to be
25 * written and completed prior to the growfs transaction being logged.
26 * To do this, we use a delayed write buffer list and wait for
27 * submission and IO completion of the list as a whole. This allows the
28 * IO subsystem to merge all the AG headers in a single AG into a single
29 * IO and hide most of the latency of the IO from us.
30 *
31 * This also means that if we get an error whilst building the buffer
32 * list to write, we can cancel the entire list without having written
33 * anything.
34 */
35static int
36xfs_resizefs_init_new_ags(
37 struct xfs_trans *tp,
38 struct aghdr_init_data *id,
39 xfs_agnumber_t oagcount,
40 xfs_agnumber_t nagcount,
41 xfs_rfsblock_t delta,
42 bool *lastag_extended)
43{
44 struct xfs_mount *mp = tp->t_mountp;
45 xfs_rfsblock_t nb = mp->m_sb.sb_dblocks + delta;
46 int error;
47
48 *lastag_extended = false;
49
50 INIT_LIST_HEAD(&id->buffer_list);
51 for (id->agno = nagcount - 1;
52 id->agno >= oagcount;
53 id->agno--, delta -= id->agsize) {
54
55 if (id->agno == nagcount - 1)
56 id->agsize = nb - (id->agno *
57 (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
58 else
59 id->agsize = mp->m_sb.sb_agblocks;
60
61 error = xfs_ag_init_headers(mp, id);
62 if (error) {
63 xfs_buf_delwri_cancel(&id->buffer_list);
64 return error;
65 }
66 }
67
68 error = xfs_buf_delwri_submit(&id->buffer_list);
69 if (error)
70 return error;
71
72 if (delta) {
73 *lastag_extended = true;
74 error = xfs_ag_extend_space(mp, tp, id, delta);
75 }
76 return error;
77}
78
79/*
80 * growfs operations
81 */
82static int
83xfs_growfs_data_private(
84 struct xfs_mount *mp, /* mount point for filesystem */
85 struct xfs_growfs_data *in) /* growfs data input struct */
86{
87 struct xfs_buf *bp;
88 int error;
89 xfs_agnumber_t nagcount;
90 xfs_agnumber_t nagimax = 0;
91 xfs_rfsblock_t nb, nb_div, nb_mod;
92 int64_t delta;
93 bool lastag_extended;
94 xfs_agnumber_t oagcount;
95 struct xfs_trans *tp;
96 struct aghdr_init_data id = {};
97
98 nb = in->newblocks;
99 error = xfs_sb_validate_fsb_count(&mp->m_sb, nb);
100 if (error)
101 return error;
102
103 if (nb > mp->m_sb.sb_dblocks) {
104 error = xfs_buf_read_uncached(mp->m_ddev_targp,
105 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
106 XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);
107 if (error)
108 return error;
109 xfs_buf_relse(bp);
110 }
111
112 nb_div = nb;
113 nb_mod = do_div(nb_div, mp->m_sb.sb_agblocks);
114 nagcount = nb_div + (nb_mod != 0);
115 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
116 nagcount--;
117 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
118 }
119 delta = nb - mp->m_sb.sb_dblocks;
120 /*
121 * Reject filesystems with a single AG because they are not
122 * supported, and reject a shrink operation that would cause a
123 * filesystem to become unsupported.
124 */
125 if (delta < 0 && nagcount < 2)
126 return -EINVAL;
127
128 oagcount = mp->m_sb.sb_agcount;
129
130 /* allocate the new per-ag structures */
131 if (nagcount > oagcount) {
132 error = xfs_initialize_perag(mp, nagcount, &nagimax);
133 if (error)
134 return error;
135 } else if (nagcount < oagcount) {
136 /* TODO: shrinking the entire AGs hasn't yet completed */
137 return -EINVAL;
138 }
139
140 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
141 (delta > 0 ? XFS_GROWFS_SPACE_RES(mp) : -delta), 0,
142 XFS_TRANS_RESERVE, &tp);
143 if (error)
144 return error;
145
146 if (delta > 0) {
147 error = xfs_resizefs_init_new_ags(tp, &id, oagcount, nagcount,
148 delta, &lastag_extended);
149 } else {
150 static struct ratelimit_state shrink_warning = \
151 RATELIMIT_STATE_INIT("shrink_warning", 86400 * HZ, 1);
152 ratelimit_set_flags(&shrink_warning, RATELIMIT_MSG_ON_RELEASE);
153
154 if (__ratelimit(&shrink_warning))
155 xfs_alert(mp,
156 "EXPERIMENTAL online shrink feature in use. Use at your own risk!");
157
158 error = xfs_ag_shrink_space(mp, &tp, nagcount - 1, -delta);
159 }
160 if (error)
161 goto out_trans_cancel;
162
163 /*
164 * Update changed superblock fields transactionally. These are not
165 * seen by the rest of the world until the transaction commit applies
166 * them atomically to the superblock.
167 */
168 if (nagcount > oagcount)
169 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
170 if (delta)
171 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, delta);
172 if (id.nfree)
173 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, id.nfree);
174
175 /*
176 * Sync sb counters now to reflect the updated values. This is
177 * particularly important for shrink because the write verifier
178 * will fail if sb_fdblocks is ever larger than sb_dblocks.
179 */
180 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
181 xfs_log_sb(tp);
182
183 xfs_trans_set_sync(tp);
184 error = xfs_trans_commit(tp);
185 if (error)
186 return error;
187
188 /* New allocation groups fully initialized, so update mount struct */
189 if (nagimax)
190 mp->m_maxagi = nagimax;
191 xfs_set_low_space_thresholds(mp);
192 mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
193
194 if (delta > 0) {
195 /*
196 * If we expanded the last AG, free the per-AG reservation
197 * so we can reinitialize it with the new size.
198 */
199 if (lastag_extended) {
200 struct xfs_perag *pag;
201
202 pag = xfs_perag_get(mp, id.agno);
203 error = xfs_ag_resv_free(pag);
204 xfs_perag_put(pag);
205 if (error)
206 return error;
207 }
208 /*
209 * Reserve AG metadata blocks. ENOSPC here does not mean there
210 * was a growfs failure, just that there still isn't space for
211 * new user data after the grow has been run.
212 */
213 error = xfs_fs_reserve_ag_blocks(mp);
214 if (error == -ENOSPC)
215 error = 0;
216 }
217 return error;
218
219out_trans_cancel:
220 xfs_trans_cancel(tp);
221 return error;
222}
223
224static int
225xfs_growfs_log_private(
226 struct xfs_mount *mp, /* mount point for filesystem */
227 struct xfs_growfs_log *in) /* growfs log input struct */
228{
229 xfs_extlen_t nb;
230
231 nb = in->newblocks;
232 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
233 return -EINVAL;
234 if (nb == mp->m_sb.sb_logblocks &&
235 in->isint == (mp->m_sb.sb_logstart != 0))
236 return -EINVAL;
237 /*
238 * Moving the log is hard, need new interfaces to sync
239 * the log first, hold off all activity while moving it.
240 * Can have shorter or longer log in the same space,
241 * or transform internal to external log or vice versa.
242 */
243 return -ENOSYS;
244}
245
246static int
247xfs_growfs_imaxpct(
248 struct xfs_mount *mp,
249 __u32 imaxpct)
250{
251 struct xfs_trans *tp;
252 int dpct;
253 int error;
254
255 if (imaxpct > 100)
256 return -EINVAL;
257
258 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
259 XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp);
260 if (error)
261 return error;
262
263 dpct = imaxpct - mp->m_sb.sb_imax_pct;
264 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
265 xfs_trans_set_sync(tp);
266 return xfs_trans_commit(tp);
267}
268
269/*
270 * protected versions of growfs function acquire and release locks on the mount
271 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
272 * XFS_IOC_FSGROWFSRT
273 */
274int
275xfs_growfs_data(
276 struct xfs_mount *mp,
277 struct xfs_growfs_data *in)
278{
279 int error = 0;
280
281 if (!capable(CAP_SYS_ADMIN))
282 return -EPERM;
283 if (!mutex_trylock(&mp->m_growlock))
284 return -EWOULDBLOCK;
285
286 /* update imaxpct separately to the physical grow of the filesystem */
287 if (in->imaxpct != mp->m_sb.sb_imax_pct) {
288 error = xfs_growfs_imaxpct(mp, in->imaxpct);
289 if (error)
290 goto out_error;
291 }
292
293 if (in->newblocks != mp->m_sb.sb_dblocks) {
294 error = xfs_growfs_data_private(mp, in);
295 if (error)
296 goto out_error;
297 }
298
299 /* Post growfs calculations needed to reflect new state in operations */
300 if (mp->m_sb.sb_imax_pct) {
301 uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
302 do_div(icount, 100);
303 M_IGEO(mp)->maxicount = XFS_FSB_TO_INO(mp, icount);
304 } else
305 M_IGEO(mp)->maxicount = 0;
306
307 /* Update secondary superblocks now the physical grow has completed */
308 error = xfs_update_secondary_sbs(mp);
309
310out_error:
311 /*
312 * Increment the generation unconditionally, the error could be from
313 * updating the secondary superblocks, in which case the new size
314 * is live already.
315 */
316 mp->m_generation++;
317 mutex_unlock(&mp->m_growlock);
318 return error;
319}
320
321int
322xfs_growfs_log(
323 xfs_mount_t *mp,
324 struct xfs_growfs_log *in)
325{
326 int error;
327
328 if (!capable(CAP_SYS_ADMIN))
329 return -EPERM;
330 if (!mutex_trylock(&mp->m_growlock))
331 return -EWOULDBLOCK;
332 error = xfs_growfs_log_private(mp, in);
333 mutex_unlock(&mp->m_growlock);
334 return error;
335}
336
337/*
338 * exported through ioctl XFS_IOC_FSCOUNTS
339 */
340
341void
342xfs_fs_counts(
343 xfs_mount_t *mp,
344 xfs_fsop_counts_t *cnt)
345{
346 cnt->allocino = percpu_counter_read_positive(&mp->m_icount);
347 cnt->freeino = percpu_counter_read_positive(&mp->m_ifree);
348 cnt->freedata = percpu_counter_read_positive(&mp->m_fdblocks) -
349 mp->m_alloc_set_aside;
350
351 spin_lock(&mp->m_sb_lock);
352 cnt->freertx = mp->m_sb.sb_frextents;
353 spin_unlock(&mp->m_sb_lock);
354}
355
356/*
357 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
358 *
359 * xfs_reserve_blocks is called to set m_resblks
360 * in the in-core mount table. The number of unused reserved blocks
361 * is kept in m_resblks_avail.
362 *
363 * Reserve the requested number of blocks if available. Otherwise return
364 * as many as possible to satisfy the request. The actual number
365 * reserved are returned in outval
366 *
367 * A null inval pointer indicates that only the current reserved blocks
368 * available should be returned no settings are changed.
369 */
370
371int
372xfs_reserve_blocks(
373 xfs_mount_t *mp,
374 uint64_t *inval,
375 xfs_fsop_resblks_t *outval)
376{
377 int64_t lcounter, delta;
378 int64_t fdblks_delta = 0;
379 uint64_t request;
380 int64_t free;
381 int error = 0;
382
383 /* If inval is null, report current values and return */
384 if (inval == (uint64_t *)NULL) {
385 if (!outval)
386 return -EINVAL;
387 outval->resblks = mp->m_resblks;
388 outval->resblks_avail = mp->m_resblks_avail;
389 return 0;
390 }
391
392 request = *inval;
393
394 /*
395 * With per-cpu counters, this becomes an interesting problem. we need
396 * to work out if we are freeing or allocation blocks first, then we can
397 * do the modification as necessary.
398 *
399 * We do this under the m_sb_lock so that if we are near ENOSPC, we will
400 * hold out any changes while we work out what to do. This means that
401 * the amount of free space can change while we do this, so we need to
402 * retry if we end up trying to reserve more space than is available.
403 */
404 spin_lock(&mp->m_sb_lock);
405
406 /*
407 * If our previous reservation was larger than the current value,
408 * then move any unused blocks back to the free pool. Modify the resblks
409 * counters directly since we shouldn't have any problems unreserving
410 * space.
411 */
412 if (mp->m_resblks > request) {
413 lcounter = mp->m_resblks_avail - request;
414 if (lcounter > 0) { /* release unused blocks */
415 fdblks_delta = lcounter;
416 mp->m_resblks_avail -= lcounter;
417 }
418 mp->m_resblks = request;
419 if (fdblks_delta) {
420 spin_unlock(&mp->m_sb_lock);
421 error = xfs_mod_fdblocks(mp, fdblks_delta, 0);
422 spin_lock(&mp->m_sb_lock);
423 }
424
425 goto out;
426 }
427
428 /*
429 * If the request is larger than the current reservation, reserve the
430 * blocks before we update the reserve counters. Sample m_fdblocks and
431 * perform a partial reservation if the request exceeds free space.
432 */
433 error = -ENOSPC;
434 do {
435 free = percpu_counter_sum(&mp->m_fdblocks) -
436 mp->m_alloc_set_aside;
437 if (free <= 0)
438 break;
439
440 delta = request - mp->m_resblks;
441 lcounter = free - delta;
442 if (lcounter < 0)
443 /* We can't satisfy the request, just get what we can */
444 fdblks_delta = free;
445 else
446 fdblks_delta = delta;
447
448 /*
449 * We'll either succeed in getting space from the free block
450 * count or we'll get an ENOSPC. If we get a ENOSPC, it means
451 * things changed while we were calculating fdblks_delta and so
452 * we should try again to see if there is anything left to
453 * reserve.
454 *
455 * Don't set the reserved flag here - we don't want to reserve
456 * the extra reserve blocks from the reserve.....
457 */
458 spin_unlock(&mp->m_sb_lock);
459 error = xfs_mod_fdblocks(mp, -fdblks_delta, 0);
460 spin_lock(&mp->m_sb_lock);
461 } while (error == -ENOSPC);
462
463 /*
464 * Update the reserve counters if blocks have been successfully
465 * allocated.
466 */
467 if (!error && fdblks_delta) {
468 mp->m_resblks += fdblks_delta;
469 mp->m_resblks_avail += fdblks_delta;
470 }
471
472out:
473 if (outval) {
474 outval->resblks = mp->m_resblks;
475 outval->resblks_avail = mp->m_resblks_avail;
476 }
477
478 spin_unlock(&mp->m_sb_lock);
479 return error;
480}
481
482int
483xfs_fs_goingdown(
484 xfs_mount_t *mp,
485 uint32_t inflags)
486{
487 switch (inflags) {
488 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
489 if (!freeze_bdev(mp->m_super->s_bdev)) {
490 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
491 thaw_bdev(mp->m_super->s_bdev);
492 }
493 break;
494 }
495 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
496 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
497 break;
498 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
499 xfs_force_shutdown(mp,
500 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
501 break;
502 default:
503 return -EINVAL;
504 }
505
506 return 0;
507}
508
509/*
510 * Force a shutdown of the filesystem instantly while keeping the filesystem
511 * consistent. We don't do an unmount here; just shutdown the shop, make sure
512 * that absolutely nothing persistent happens to this filesystem after this
513 * point.
514 */
515void
516xfs_do_force_shutdown(
517 struct xfs_mount *mp,
518 int flags,
519 char *fname,
520 int lnnum)
521{
522 bool logerror = flags & SHUTDOWN_LOG_IO_ERROR;
523
524 /*
525 * No need to duplicate efforts.
526 */
527 if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
528 return;
529
530 /*
531 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
532 * queue up anybody new on the log reservations, and wakes up
533 * everybody who's sleeping on log reservations to tell them
534 * the bad news.
535 */
536 if (xfs_log_force_umount(mp, logerror))
537 return;
538
539 if (flags & SHUTDOWN_FORCE_UMOUNT) {
540 xfs_alert(mp,
541"User initiated shutdown (0x%x) received. Shutting down filesystem",
542 flags);
543 return;
544 }
545
546 if (flags & SHUTDOWN_CORRUPT_INCORE) {
547 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
548"Corruption of in-memory data (0x%x) detected at %pS (%s:%d). Shutting down filesystem",
549 flags, __return_address, fname, lnnum);
550 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
551 xfs_stack_trace();
552 } else if (logerror) {
553 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
554"Log I/O error (0x%x) detected at %pS (%s:%d). Shutting down filesystem",
555 flags, __return_address, fname, lnnum);
556 } else {
557 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
558"I/O error (0x%x) detected at %pS (%s:%d). Shutting down filesystem",
559 flags, __return_address, fname, lnnum);
560 }
561
562 xfs_alert(mp,
563 "Please unmount the filesystem and rectify the problem(s)");
564}
565
566/*
567 * Reserve free space for per-AG metadata.
568 */
569int
570xfs_fs_reserve_ag_blocks(
571 struct xfs_mount *mp)
572{
573 xfs_agnumber_t agno;
574 struct xfs_perag *pag;
575 int error = 0;
576 int err2;
577
578 mp->m_finobt_nores = false;
579 for_each_perag(mp, agno, pag) {
580 err2 = xfs_ag_resv_init(pag, NULL);
581 if (err2 && !error)
582 error = err2;
583 }
584
585 if (error && error != -ENOSPC) {
586 xfs_warn(mp,
587 "Error %d reserving per-AG metadata reserve pool.", error);
588 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
589 }
590
591 return error;
592}
593
594/*
595 * Free space reserved for per-AG metadata.
596 */
597int
598xfs_fs_unreserve_ag_blocks(
599 struct xfs_mount *mp)
600{
601 xfs_agnumber_t agno;
602 struct xfs_perag *pag;
603 int error = 0;
604 int err2;
605
606 for_each_perag(mp, agno, pag) {
607 err2 = xfs_ag_resv_free(pag);
608 if (err2 && !error)
609 error = err2;
610 }
611
612 if (error)
613 xfs_warn(mp,
614 "Error %d freeing per-AG metadata reserve pool.", error);
615
616 return error;
617}