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_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"
23 #include "xfs_log.h"
24 #include "xfs_ag.h"
25 #include "xfs_ag_resv.h"
26
27 /*
28 * growfs operations
29 */
30 static int
xfs_growfs_data_private(xfs_mount_t * mp,xfs_growfs_data_t * in)31 xfs_growfs_data_private(
32 xfs_mount_t *mp, /* mount point for filesystem */
33 xfs_growfs_data_t *in) /* growfs data input struct */
34 {
35 xfs_buf_t *bp;
36 int error;
37 xfs_agnumber_t nagcount;
38 xfs_agnumber_t nagimax = 0;
39 xfs_rfsblock_t nb, nb_mod;
40 xfs_rfsblock_t new;
41 xfs_agnumber_t oagcount;
42 xfs_trans_t *tp;
43 LIST_HEAD (buffer_list);
44 struct aghdr_init_data id = {};
45
46 nb = in->newblocks;
47 if (nb < mp->m_sb.sb_dblocks)
48 return -EINVAL;
49 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
50 return error;
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);
54 if (error)
55 return error;
56 xfs_buf_relse(bp);
57
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) {
62 nagcount--;
63 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
64 if (nb < mp->m_sb.sb_dblocks)
65 return -EINVAL;
66 }
67 new = nb - mp->m_sb.sb_dblocks;
68 oagcount = mp->m_sb.sb_agcount;
69
70 /* allocate the new per-ag structures */
71 if (nagcount > oagcount) {
72 error = xfs_initialize_perag(mp, nagcount, &nagimax);
73 if (error)
74 return error;
75 }
76
77 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
78 XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp);
79 if (error)
80 return error;
81
82 /*
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.
89 *
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
92 * anything.
93 */
94 INIT_LIST_HEAD(&id.buffer_list);
95 for (id.agno = nagcount - 1;
96 id.agno >= oagcount;
97 id.agno--, new -= id.agsize) {
98
99 if (id.agno == nagcount - 1)
100 id.agsize = nb -
101 (id.agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
102 else
103 id.agsize = mp->m_sb.sb_agblocks;
104
105 error = xfs_ag_init_headers(mp, &id);
106 if (error) {
107 xfs_buf_delwri_cancel(&id.buffer_list);
108 goto out_trans_cancel;
109 }
110 }
111 error = xfs_buf_delwri_submit(&id.buffer_list);
112 if (error)
113 goto out_trans_cancel;
114
115 xfs_trans_agblocks_delta(tp, id.nfree);
116
117 /* If there are new blocks in the old last AG, extend it. */
118 if (new) {
119 error = xfs_ag_extend_space(mp, tp, &id, new);
120 if (error)
121 goto out_trans_cancel;
122 }
123
124 /*
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.
128 */
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);
134 if (id.nfree)
135 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, id.nfree);
136 xfs_trans_set_sync(tp);
137 error = xfs_trans_commit(tp);
138 if (error)
139 return error;
140
141 /* New allocation groups fully initialized, so update mount struct */
142 if (nagimax)
143 mp->m_maxagi = nagimax;
144 xfs_set_low_space_thresholds(mp);
145 mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
146
147 /*
148 * If we expanded the last AG, free the per-AG reservation
149 * so we can reinitialize it with the new size.
150 */
151 if (new) {
152 struct xfs_perag *pag;
153
154 pag = xfs_perag_get(mp, id.agno);
155 error = xfs_ag_resv_free(pag);
156 xfs_perag_put(pag);
157 if (error)
158 return error;
159 }
160
161 /*
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.
165 */
166 error = xfs_fs_reserve_ag_blocks(mp);
167 if (error == -ENOSPC)
168 error = 0;
169 return error;
170
171 out_trans_cancel:
172 xfs_trans_cancel(tp);
173 return error;
174 }
175
176 static int
xfs_growfs_log_private(xfs_mount_t * mp,xfs_growfs_log_t * in)177 xfs_growfs_log_private(
178 xfs_mount_t *mp, /* mount point for filesystem */
179 xfs_growfs_log_t *in) /* growfs log input struct */
180 {
181 xfs_extlen_t nb;
182
183 nb = in->newblocks;
184 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
185 return -EINVAL;
186 if (nb == mp->m_sb.sb_logblocks &&
187 in->isint == (mp->m_sb.sb_logstart != 0))
188 return -EINVAL;
189 /*
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.
194 */
195 return -ENOSYS;
196 }
197
198 static int
xfs_growfs_imaxpct(struct xfs_mount * mp,__u32 imaxpct)199 xfs_growfs_imaxpct(
200 struct xfs_mount *mp,
201 __u32 imaxpct)
202 {
203 struct xfs_trans *tp;
204 int dpct;
205 int error;
206
207 if (imaxpct > 100)
208 return -EINVAL;
209
210 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
211 XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp);
212 if (error)
213 return error;
214
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);
219 }
220
221 /*
222 * protected versions of growfs function acquire and release locks on the mount
223 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
224 * XFS_IOC_FSGROWFSRT
225 */
226 int
xfs_growfs_data(struct xfs_mount * mp,struct xfs_growfs_data * in)227 xfs_growfs_data(
228 struct xfs_mount *mp,
229 struct xfs_growfs_data *in)
230 {
231 int error = 0;
232
233 if (!capable(CAP_SYS_ADMIN))
234 return -EPERM;
235 if (!mutex_trylock(&mp->m_growlock))
236 return -EWOULDBLOCK;
237
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);
241 if (error)
242 goto out_error;
243 }
244
245 if (in->newblocks != mp->m_sb.sb_dblocks) {
246 error = xfs_growfs_data_private(mp, in);
247 if (error)
248 goto out_error;
249 }
250
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;
254 do_div(icount, 100);
255 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
256 } else
257 mp->m_maxicount = 0;
258
259 /* Update secondary superblocks now the physical grow has completed */
260 error = xfs_update_secondary_sbs(mp);
261
262 out_error:
263 /*
264 * Increment the generation unconditionally, the error could be from
265 * updating the secondary superblocks, in which case the new size
266 * is live already.
267 */
268 mp->m_generation++;
269 mutex_unlock(&mp->m_growlock);
270 return error;
271 }
272
273 int
xfs_growfs_log(xfs_mount_t * mp,xfs_growfs_log_t * in)274 xfs_growfs_log(
275 xfs_mount_t *mp,
276 xfs_growfs_log_t *in)
277 {
278 int error;
279
280 if (!capable(CAP_SYS_ADMIN))
281 return -EPERM;
282 if (!mutex_trylock(&mp->m_growlock))
283 return -EWOULDBLOCK;
284 error = xfs_growfs_log_private(mp, in);
285 mutex_unlock(&mp->m_growlock);
286 return error;
287 }
288
289 /*
290 * exported through ioctl XFS_IOC_FSCOUNTS
291 */
292
293 int
xfs_fs_counts(xfs_mount_t * mp,xfs_fsop_counts_t * cnt)294 xfs_fs_counts(
295 xfs_mount_t *mp,
296 xfs_fsop_counts_t *cnt)
297 {
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;
302
303 spin_lock(&mp->m_sb_lock);
304 cnt->freertx = mp->m_sb.sb_frextents;
305 spin_unlock(&mp->m_sb_lock);
306 return 0;
307 }
308
309 /*
310 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
311 *
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.
315 *
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
319 *
320 * A null inval pointer indicates that only the current reserved blocks
321 * available should be returned no settings are changed.
322 */
323
324 int
xfs_reserve_blocks(xfs_mount_t * mp,uint64_t * inval,xfs_fsop_resblks_t * outval)325 xfs_reserve_blocks(
326 xfs_mount_t *mp,
327 uint64_t *inval,
328 xfs_fsop_resblks_t *outval)
329 {
330 int64_t lcounter, delta;
331 int64_t fdblks_delta = 0;
332 uint64_t request;
333 int64_t free;
334 int error = 0;
335
336 /* If inval is null, report current values and return */
337 if (inval == (uint64_t *)NULL) {
338 if (!outval)
339 return -EINVAL;
340 outval->resblks = mp->m_resblks;
341 outval->resblks_avail = mp->m_resblks_avail;
342 return 0;
343 }
344
345 request = *inval;
346
347 /*
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.
351 *
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.
356 */
357 spin_lock(&mp->m_sb_lock);
358
359 /*
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
363 * space.
364 */
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;
370 }
371 mp->m_resblks = request;
372 if (fdblks_delta) {
373 spin_unlock(&mp->m_sb_lock);
374 error = xfs_mod_fdblocks(mp, fdblks_delta, 0);
375 spin_lock(&mp->m_sb_lock);
376 }
377
378 goto out;
379 }
380
381 /*
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.
385 */
386 error = -ENOSPC;
387 do {
388 free = percpu_counter_sum(&mp->m_fdblocks) -
389 mp->m_alloc_set_aside;
390 if (free <= 0)
391 break;
392
393 delta = request - mp->m_resblks;
394 lcounter = free - delta;
395 if (lcounter < 0)
396 /* We can't satisfy the request, just get what we can */
397 fdblks_delta = free;
398 else
399 fdblks_delta = delta;
400
401 /*
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
406 * reserve.
407 *
408 * Don't set the reserved flag here - we don't want to reserve
409 * the extra reserve blocks from the reserve.....
410 */
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);
415
416 /*
417 * Update the reserve counters if blocks have been successfully
418 * allocated.
419 */
420 if (!error && fdblks_delta) {
421 mp->m_resblks += fdblks_delta;
422 mp->m_resblks_avail += fdblks_delta;
423 }
424
425 out:
426 if (outval) {
427 outval->resblks = mp->m_resblks;
428 outval->resblks_avail = mp->m_resblks_avail;
429 }
430
431 spin_unlock(&mp->m_sb_lock);
432 return error;
433 }
434
435 int
xfs_fs_goingdown(xfs_mount_t * mp,uint32_t inflags)436 xfs_fs_goingdown(
437 xfs_mount_t *mp,
438 uint32_t inflags)
439 {
440 switch (inflags) {
441 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
442 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
443
444 if (sb && !IS_ERR(sb)) {
445 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
446 thaw_bdev(sb->s_bdev, sb);
447 }
448
449 break;
450 }
451 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
452 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
453 break;
454 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
455 xfs_force_shutdown(mp,
456 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
457 break;
458 default:
459 return -EINVAL;
460 }
461
462 return 0;
463 }
464
465 /*
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
469 * point.
470 */
471 void
xfs_do_force_shutdown(xfs_mount_t * mp,int flags,char * fname,int lnnum)472 xfs_do_force_shutdown(
473 xfs_mount_t *mp,
474 int flags,
475 char *fname,
476 int lnnum)
477 {
478 int logerror;
479
480 logerror = flags & SHUTDOWN_LOG_IO_ERROR;
481
482 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
483 xfs_notice(mp,
484 "%s(0x%x) called from line %d of file %s. Return address = "PTR_FMT,
485 __func__, flags, lnnum, fname, __return_address);
486 }
487 /*
488 * No need to duplicate efforts.
489 */
490 if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
491 return;
492
493 /*
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
497 * the bad news.
498 */
499 if (xfs_log_force_umount(mp, logerror))
500 return;
501
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)
506 xfs_stack_trace();
507 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
508 if (logerror) {
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");
517 }
518 }
519 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
520 xfs_alert(mp,
521 "Please umount the filesystem and rectify the problem(s)");
522 }
523 }
524
525 /*
526 * Reserve free space for per-AG metadata.
527 */
528 int
xfs_fs_reserve_ag_blocks(struct xfs_mount * mp)529 xfs_fs_reserve_ag_blocks(
530 struct xfs_mount *mp)
531 {
532 xfs_agnumber_t agno;
533 struct xfs_perag *pag;
534 int error = 0;
535 int err2;
536
537 mp->m_finobt_nores = false;
538 for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
539 pag = xfs_perag_get(mp, agno);
540 err2 = xfs_ag_resv_init(pag, NULL);
541 xfs_perag_put(pag);
542 if (err2 && !error)
543 error = err2;
544 }
545
546 if (error && error != -ENOSPC) {
547 xfs_warn(mp,
548 "Error %d reserving per-AG metadata reserve pool.", error);
549 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
550 }
551
552 return error;
553 }
554
555 /*
556 * Free space reserved for per-AG metadata.
557 */
558 int
xfs_fs_unreserve_ag_blocks(struct xfs_mount * mp)559 xfs_fs_unreserve_ag_blocks(
560 struct xfs_mount *mp)
561 {
562 xfs_agnumber_t agno;
563 struct xfs_perag *pag;
564 int error = 0;
565 int err2;
566
567 for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
568 pag = xfs_perag_get(mp, agno);
569 err2 = xfs_ag_resv_free(pag);
570 xfs_perag_put(pag);
571 if (err2 && !error)
572 error = err2;
573 }
574
575 if (error)
576 xfs_warn(mp,
577 "Error %d freeing per-AG metadata reserve pool.", error);
578
579 return error;
580 }
581