1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6
7#include "xfs.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_inode.h"
15#include "xfs_btree.h"
16#include "xfs_bmap.h"
17#include "xfs_alloc.h"
18#include "xfs_fsops.h"
19#include "xfs_trans.h"
20#include "xfs_buf_item.h"
21#include "xfs_log.h"
22#include "xfs_log_priv.h"
23#include "xfs_dir2.h"
24#include "xfs_extfree_item.h"
25#include "xfs_mru_cache.h"
26#include "xfs_inode_item.h"
27#include "xfs_icache.h"
28#include "xfs_trace.h"
29#include "xfs_icreate_item.h"
30#include "xfs_filestream.h"
31#include "xfs_quota.h"
32#include "xfs_sysfs.h"
33#include "xfs_ondisk.h"
34#include "xfs_rmap_item.h"
35#include "xfs_refcount_item.h"
36#include "xfs_bmap_item.h"
37#include "xfs_reflink.h"
38#include "xfs_pwork.h"
39#include "xfs_ag.h"
40#include "xfs_defer.h"
41#include "xfs_attr_item.h"
42#include "xfs_xattr.h"
43#include "xfs_iunlink_item.h"
44#include "xfs_dahash_test.h"
45#include "xfs_rtbitmap.h"
46#include "scrub/stats.h"
47
48#include <linux/magic.h>
49#include <linux/fs_context.h>
50#include <linux/fs_parser.h>
51
52static const struct super_operations xfs_super_operations;
53
54static struct dentry *xfs_debugfs; /* top-level xfs debugfs dir */
55static struct kset *xfs_kset; /* top-level xfs sysfs dir */
56#ifdef DEBUG
57static struct xfs_kobj xfs_dbg_kobj; /* global debug sysfs attrs */
58#endif
59
60enum xfs_dax_mode {
61 XFS_DAX_INODE = 0,
62 XFS_DAX_ALWAYS = 1,
63 XFS_DAX_NEVER = 2,
64};
65
66static void
67xfs_mount_set_dax_mode(
68 struct xfs_mount *mp,
69 enum xfs_dax_mode mode)
70{
71 switch (mode) {
72 case XFS_DAX_INODE:
73 mp->m_features &= ~(XFS_FEAT_DAX_ALWAYS | XFS_FEAT_DAX_NEVER);
74 break;
75 case XFS_DAX_ALWAYS:
76 mp->m_features |= XFS_FEAT_DAX_ALWAYS;
77 mp->m_features &= ~XFS_FEAT_DAX_NEVER;
78 break;
79 case XFS_DAX_NEVER:
80 mp->m_features |= XFS_FEAT_DAX_NEVER;
81 mp->m_features &= ~XFS_FEAT_DAX_ALWAYS;
82 break;
83 }
84}
85
86static const struct constant_table dax_param_enums[] = {
87 {"inode", XFS_DAX_INODE },
88 {"always", XFS_DAX_ALWAYS },
89 {"never", XFS_DAX_NEVER },
90 {}
91};
92
93/*
94 * Table driven mount option parser.
95 */
96enum {
97 Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev,
98 Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
99 Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
100 Opt_allocsize, Opt_norecovery, Opt_inode64, Opt_inode32, Opt_ikeep,
101 Opt_noikeep, Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2,
102 Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota,
103 Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota,
104 Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
105 Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum,
106};
107
108static const struct fs_parameter_spec xfs_fs_parameters[] = {
109 fsparam_u32("logbufs", Opt_logbufs),
110 fsparam_string("logbsize", Opt_logbsize),
111 fsparam_string("logdev", Opt_logdev),
112 fsparam_string("rtdev", Opt_rtdev),
113 fsparam_flag("wsync", Opt_wsync),
114 fsparam_flag("noalign", Opt_noalign),
115 fsparam_flag("swalloc", Opt_swalloc),
116 fsparam_u32("sunit", Opt_sunit),
117 fsparam_u32("swidth", Opt_swidth),
118 fsparam_flag("nouuid", Opt_nouuid),
119 fsparam_flag("grpid", Opt_grpid),
120 fsparam_flag("nogrpid", Opt_nogrpid),
121 fsparam_flag("bsdgroups", Opt_bsdgroups),
122 fsparam_flag("sysvgroups", Opt_sysvgroups),
123 fsparam_string("allocsize", Opt_allocsize),
124 fsparam_flag("norecovery", Opt_norecovery),
125 fsparam_flag("inode64", Opt_inode64),
126 fsparam_flag("inode32", Opt_inode32),
127 fsparam_flag("ikeep", Opt_ikeep),
128 fsparam_flag("noikeep", Opt_noikeep),
129 fsparam_flag("largeio", Opt_largeio),
130 fsparam_flag("nolargeio", Opt_nolargeio),
131 fsparam_flag("attr2", Opt_attr2),
132 fsparam_flag("noattr2", Opt_noattr2),
133 fsparam_flag("filestreams", Opt_filestreams),
134 fsparam_flag("quota", Opt_quota),
135 fsparam_flag("noquota", Opt_noquota),
136 fsparam_flag("usrquota", Opt_usrquota),
137 fsparam_flag("grpquota", Opt_grpquota),
138 fsparam_flag("prjquota", Opt_prjquota),
139 fsparam_flag("uquota", Opt_uquota),
140 fsparam_flag("gquota", Opt_gquota),
141 fsparam_flag("pquota", Opt_pquota),
142 fsparam_flag("uqnoenforce", Opt_uqnoenforce),
143 fsparam_flag("gqnoenforce", Opt_gqnoenforce),
144 fsparam_flag("pqnoenforce", Opt_pqnoenforce),
145 fsparam_flag("qnoenforce", Opt_qnoenforce),
146 fsparam_flag("discard", Opt_discard),
147 fsparam_flag("nodiscard", Opt_nodiscard),
148 fsparam_flag("dax", Opt_dax),
149 fsparam_enum("dax", Opt_dax_enum, dax_param_enums),
150 {}
151};
152
153struct proc_xfs_info {
154 uint64_t flag;
155 char *str;
156};
157
158static int
159xfs_fs_show_options(
160 struct seq_file *m,
161 struct dentry *root)
162{
163 static struct proc_xfs_info xfs_info_set[] = {
164 /* the few simple ones we can get from the mount struct */
165 { XFS_FEAT_IKEEP, ",ikeep" },
166 { XFS_FEAT_WSYNC, ",wsync" },
167 { XFS_FEAT_NOALIGN, ",noalign" },
168 { XFS_FEAT_SWALLOC, ",swalloc" },
169 { XFS_FEAT_NOUUID, ",nouuid" },
170 { XFS_FEAT_NORECOVERY, ",norecovery" },
171 { XFS_FEAT_ATTR2, ",attr2" },
172 { XFS_FEAT_FILESTREAMS, ",filestreams" },
173 { XFS_FEAT_GRPID, ",grpid" },
174 { XFS_FEAT_DISCARD, ",discard" },
175 { XFS_FEAT_LARGE_IOSIZE, ",largeio" },
176 { XFS_FEAT_DAX_ALWAYS, ",dax=always" },
177 { XFS_FEAT_DAX_NEVER, ",dax=never" },
178 { 0, NULL }
179 };
180 struct xfs_mount *mp = XFS_M(root->d_sb);
181 struct proc_xfs_info *xfs_infop;
182
183 for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
184 if (mp->m_features & xfs_infop->flag)
185 seq_puts(m, s: xfs_infop->str);
186 }
187
188 seq_printf(m, fmt: ",inode%d", xfs_has_small_inums(mp) ? 32 : 64);
189
190 if (xfs_has_allocsize(mp))
191 seq_printf(m, fmt: ",allocsize=%dk",
192 (1 << mp->m_allocsize_log) >> 10);
193
194 if (mp->m_logbufs > 0)
195 seq_printf(m, fmt: ",logbufs=%d", mp->m_logbufs);
196 if (mp->m_logbsize > 0)
197 seq_printf(m, fmt: ",logbsize=%dk", mp->m_logbsize >> 10);
198
199 if (mp->m_logname)
200 seq_show_option(m, name: "logdev", value: mp->m_logname);
201 if (mp->m_rtname)
202 seq_show_option(m, name: "rtdev", value: mp->m_rtname);
203
204 if (mp->m_dalign > 0)
205 seq_printf(m, fmt: ",sunit=%d",
206 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
207 if (mp->m_swidth > 0)
208 seq_printf(m, fmt: ",swidth=%d",
209 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
210
211 if (mp->m_qflags & XFS_UQUOTA_ENFD)
212 seq_puts(m, s: ",usrquota");
213 else if (mp->m_qflags & XFS_UQUOTA_ACCT)
214 seq_puts(m, s: ",uqnoenforce");
215
216 if (mp->m_qflags & XFS_PQUOTA_ENFD)
217 seq_puts(m, s: ",prjquota");
218 else if (mp->m_qflags & XFS_PQUOTA_ACCT)
219 seq_puts(m, s: ",pqnoenforce");
220
221 if (mp->m_qflags & XFS_GQUOTA_ENFD)
222 seq_puts(m, s: ",grpquota");
223 else if (mp->m_qflags & XFS_GQUOTA_ACCT)
224 seq_puts(m, s: ",gqnoenforce");
225
226 if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
227 seq_puts(m, s: ",noquota");
228
229 return 0;
230}
231
232static bool
233xfs_set_inode_alloc_perag(
234 struct xfs_perag *pag,
235 xfs_ino_t ino,
236 xfs_agnumber_t max_metadata)
237{
238 if (!xfs_is_inode32(mp: pag->pag_mount)) {
239 set_bit(XFS_AGSTATE_ALLOWS_INODES, &pag->pag_opstate);
240 clear_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate);
241 return false;
242 }
243
244 if (ino > XFS_MAXINUMBER_32) {
245 clear_bit(XFS_AGSTATE_ALLOWS_INODES, &pag->pag_opstate);
246 clear_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate);
247 return false;
248 }
249
250 set_bit(XFS_AGSTATE_ALLOWS_INODES, &pag->pag_opstate);
251 if (pag->pag_agno < max_metadata)
252 set_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate);
253 else
254 clear_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate);
255 return true;
256}
257
258/*
259 * Set parameters for inode allocation heuristics, taking into account
260 * filesystem size and inode32/inode64 mount options; i.e. specifically
261 * whether or not XFS_FEAT_SMALL_INUMS is set.
262 *
263 * Inode allocation patterns are altered only if inode32 is requested
264 * (XFS_FEAT_SMALL_INUMS), and the filesystem is sufficiently large.
265 * If altered, XFS_OPSTATE_INODE32 is set as well.
266 *
267 * An agcount independent of that in the mount structure is provided
268 * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
269 * to the potentially higher ag count.
270 *
271 * Returns the maximum AG index which may contain inodes.
272 */
273xfs_agnumber_t
274xfs_set_inode_alloc(
275 struct xfs_mount *mp,
276 xfs_agnumber_t agcount)
277{
278 xfs_agnumber_t index;
279 xfs_agnumber_t maxagi = 0;
280 xfs_sb_t *sbp = &mp->m_sb;
281 xfs_agnumber_t max_metadata;
282 xfs_agino_t agino;
283 xfs_ino_t ino;
284
285 /*
286 * Calculate how much should be reserved for inodes to meet
287 * the max inode percentage. Used only for inode32.
288 */
289 if (M_IGEO(mp)->maxicount) {
290 uint64_t icount;
291
292 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
293 do_div(icount, 100);
294 icount += sbp->sb_agblocks - 1;
295 do_div(icount, sbp->sb_agblocks);
296 max_metadata = icount;
297 } else {
298 max_metadata = agcount;
299 }
300
301 /* Get the last possible inode in the filesystem */
302 agino = XFS_AGB_TO_AGINO(mp, sbp->sb_agblocks - 1);
303 ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
304
305 /*
306 * If user asked for no more than 32-bit inodes, and the fs is
307 * sufficiently large, set XFS_OPSTATE_INODE32 if we must alter
308 * the allocator to accommodate the request.
309 */
310 if (xfs_has_small_inums(mp) && ino > XFS_MAXINUMBER_32)
311 set_bit(XFS_OPSTATE_INODE32, addr: &mp->m_opstate);
312 else
313 clear_bit(XFS_OPSTATE_INODE32, addr: &mp->m_opstate);
314
315 for (index = 0; index < agcount; index++) {
316 struct xfs_perag *pag;
317
318 ino = XFS_AGINO_TO_INO(mp, index, agino);
319
320 pag = xfs_perag_get(mp, index);
321 if (xfs_set_inode_alloc_perag(pag, ino, max_metadata))
322 maxagi++;
323 xfs_perag_put(pag);
324 }
325
326 return xfs_is_inode32(mp) ? maxagi : agcount;
327}
328
329static int
330xfs_setup_dax_always(
331 struct xfs_mount *mp)
332{
333 if (!mp->m_ddev_targp->bt_daxdev &&
334 (!mp->m_rtdev_targp || !mp->m_rtdev_targp->bt_daxdev)) {
335 xfs_alert(mp,
336 "DAX unsupported by block device. Turning off DAX.");
337 goto disable_dax;
338 }
339
340 if (mp->m_super->s_blocksize != PAGE_SIZE) {
341 xfs_alert(mp,
342 "DAX not supported for blocksize. Turning off DAX.");
343 goto disable_dax;
344 }
345
346 if (xfs_has_reflink(mp) &&
347 bdev_is_partition(bdev: mp->m_ddev_targp->bt_bdev)) {
348 xfs_alert(mp,
349 "DAX and reflink cannot work with multi-partitions!");
350 return -EINVAL;
351 }
352
353 xfs_warn(mp, "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
354 return 0;
355
356disable_dax:
357 xfs_mount_set_dax_mode(mp, mode: XFS_DAX_NEVER);
358 return 0;
359}
360
361STATIC int
362xfs_blkdev_get(
363 xfs_mount_t *mp,
364 const char *name,
365 struct bdev_handle **handlep)
366{
367 int error = 0;
368
369 *handlep = bdev_open_by_path(path: name, BLK_OPEN_READ | BLK_OPEN_WRITE,
370 holder: mp->m_super, hops: &fs_holder_ops);
371 if (IS_ERR(ptr: *handlep)) {
372 error = PTR_ERR(ptr: *handlep);
373 *handlep = NULL;
374 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
375 }
376
377 return error;
378}
379
380STATIC void
381xfs_shutdown_devices(
382 struct xfs_mount *mp)
383{
384 /*
385 * Udev is triggered whenever anyone closes a block device or unmounts
386 * a file systemm on a block device.
387 * The default udev rules invoke blkid to read the fs super and create
388 * symlinks to the bdev under /dev/disk. For this, it uses buffered
389 * reads through the page cache.
390 *
391 * xfs_db also uses buffered reads to examine metadata. There is no
392 * coordination between xfs_db and udev, which means that they can run
393 * concurrently. Note there is no coordination between the kernel and
394 * blkid either.
395 *
396 * On a system with 64k pages, the page cache can cache the superblock
397 * and the root inode (and hence the root directory) with the same 64k
398 * page. If udev spawns blkid after the mkfs and the system is busy
399 * enough that it is still running when xfs_db starts up, they'll both
400 * read from the same page in the pagecache.
401 *
402 * The unmount writes updated inode metadata to disk directly. The XFS
403 * buffer cache does not use the bdev pagecache, so it needs to
404 * invalidate that pagecache on unmount. If the above scenario occurs,
405 * the pagecache no longer reflects what's on disk, xfs_db reads the
406 * stale metadata, and fails to find /a. Most of the time this succeeds
407 * because closing a bdev invalidates the page cache, but when processes
408 * race, everyone loses.
409 */
410 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
411 blkdev_issue_flush(bdev: mp->m_logdev_targp->bt_bdev);
412 invalidate_bdev(bdev: mp->m_logdev_targp->bt_bdev);
413 }
414 if (mp->m_rtdev_targp) {
415 blkdev_issue_flush(bdev: mp->m_rtdev_targp->bt_bdev);
416 invalidate_bdev(bdev: mp->m_rtdev_targp->bt_bdev);
417 }
418 blkdev_issue_flush(bdev: mp->m_ddev_targp->bt_bdev);
419 invalidate_bdev(bdev: mp->m_ddev_targp->bt_bdev);
420}
421
422/*
423 * The file system configurations are:
424 * (1) device (partition) with data and internal log
425 * (2) logical volume with data and log subvolumes.
426 * (3) logical volume with data, log, and realtime subvolumes.
427 *
428 * We only have to handle opening the log and realtime volumes here if
429 * they are present. The data subvolume has already been opened by
430 * get_sb_bdev() and is stored in sb->s_bdev.
431 */
432STATIC int
433xfs_open_devices(
434 struct xfs_mount *mp)
435{
436 struct super_block *sb = mp->m_super;
437 struct block_device *ddev = sb->s_bdev;
438 struct bdev_handle *logdev_handle = NULL, *rtdev_handle = NULL;
439 int error;
440
441 /*
442 * blkdev_put() can't be called under s_umount, see the comment
443 * in get_tree_bdev() for more details
444 */
445 up_write(sem: &sb->s_umount);
446
447 /*
448 * Open real time and log devices - order is important.
449 */
450 if (mp->m_logname) {
451 error = xfs_blkdev_get(mp, name: mp->m_logname, handlep: &logdev_handle);
452 if (error)
453 goto out_relock;
454 }
455
456 if (mp->m_rtname) {
457 error = xfs_blkdev_get(mp, name: mp->m_rtname, handlep: &rtdev_handle);
458 if (error)
459 goto out_close_logdev;
460
461 if (rtdev_handle->bdev == ddev ||
462 (logdev_handle &&
463 rtdev_handle->bdev == logdev_handle->bdev)) {
464 xfs_warn(mp,
465 "Cannot mount filesystem with identical rtdev and ddev/logdev.");
466 error = -EINVAL;
467 goto out_close_rtdev;
468 }
469 }
470
471 /*
472 * Setup xfs_mount buffer target pointers
473 */
474 error = -ENOMEM;
475 mp->m_ddev_targp = xfs_alloc_buftarg(mp, bdev_handle: sb->s_bdev_handle);
476 if (!mp->m_ddev_targp)
477 goto out_close_rtdev;
478
479 if (rtdev_handle) {
480 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, bdev_handle: rtdev_handle);
481 if (!mp->m_rtdev_targp)
482 goto out_free_ddev_targ;
483 }
484
485 if (logdev_handle && logdev_handle->bdev != ddev) {
486 mp->m_logdev_targp = xfs_alloc_buftarg(mp, bdev_handle: logdev_handle);
487 if (!mp->m_logdev_targp)
488 goto out_free_rtdev_targ;
489 } else {
490 mp->m_logdev_targp = mp->m_ddev_targp;
491 /* Handle won't be used, drop it */
492 if (logdev_handle)
493 bdev_release(handle: logdev_handle);
494 }
495
496 error = 0;
497out_relock:
498 down_write(sem: &sb->s_umount);
499 return error;
500
501 out_free_rtdev_targ:
502 if (mp->m_rtdev_targp)
503 xfs_free_buftarg(mp->m_rtdev_targp);
504 out_free_ddev_targ:
505 xfs_free_buftarg(mp->m_ddev_targp);
506 out_close_rtdev:
507 if (rtdev_handle)
508 bdev_release(handle: rtdev_handle);
509 out_close_logdev:
510 if (logdev_handle)
511 bdev_release(handle: logdev_handle);
512 goto out_relock;
513}
514
515/*
516 * Setup xfs_mount buffer target pointers based on superblock
517 */
518STATIC int
519xfs_setup_devices(
520 struct xfs_mount *mp)
521{
522 int error;
523
524 error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
525 if (error)
526 return error;
527
528 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
529 unsigned int log_sector_size = BBSIZE;
530
531 if (xfs_has_sector(mp))
532 log_sector_size = mp->m_sb.sb_logsectsize;
533 error = xfs_setsize_buftarg(mp->m_logdev_targp,
534 log_sector_size);
535 if (error)
536 return error;
537 }
538 if (mp->m_rtdev_targp) {
539 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
540 mp->m_sb.sb_sectsize);
541 if (error)
542 return error;
543 }
544
545 return 0;
546}
547
548STATIC int
549xfs_init_mount_workqueues(
550 struct xfs_mount *mp)
551{
552 mp->m_buf_workqueue = alloc_workqueue(fmt: "xfs-buf/%s",
553 XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
554 max_active: 1, mp->m_super->s_id);
555 if (!mp->m_buf_workqueue)
556 goto out;
557
558 mp->m_unwritten_workqueue = alloc_workqueue(fmt: "xfs-conv/%s",
559 XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
560 max_active: 0, mp->m_super->s_id);
561 if (!mp->m_unwritten_workqueue)
562 goto out_destroy_buf;
563
564 mp->m_reclaim_workqueue = alloc_workqueue(fmt: "xfs-reclaim/%s",
565 XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
566 max_active: 0, mp->m_super->s_id);
567 if (!mp->m_reclaim_workqueue)
568 goto out_destroy_unwritten;
569
570 mp->m_blockgc_wq = alloc_workqueue(fmt: "xfs-blockgc/%s",
571 XFS_WQFLAGS(WQ_UNBOUND | WQ_FREEZABLE | WQ_MEM_RECLAIM),
572 max_active: 0, mp->m_super->s_id);
573 if (!mp->m_blockgc_wq)
574 goto out_destroy_reclaim;
575
576 mp->m_inodegc_wq = alloc_workqueue(fmt: "xfs-inodegc/%s",
577 XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
578 max_active: 1, mp->m_super->s_id);
579 if (!mp->m_inodegc_wq)
580 goto out_destroy_blockgc;
581
582 mp->m_sync_workqueue = alloc_workqueue(fmt: "xfs-sync/%s",
583 XFS_WQFLAGS(WQ_FREEZABLE), max_active: 0, mp->m_super->s_id);
584 if (!mp->m_sync_workqueue)
585 goto out_destroy_inodegc;
586
587 return 0;
588
589out_destroy_inodegc:
590 destroy_workqueue(wq: mp->m_inodegc_wq);
591out_destroy_blockgc:
592 destroy_workqueue(wq: mp->m_blockgc_wq);
593out_destroy_reclaim:
594 destroy_workqueue(wq: mp->m_reclaim_workqueue);
595out_destroy_unwritten:
596 destroy_workqueue(wq: mp->m_unwritten_workqueue);
597out_destroy_buf:
598 destroy_workqueue(wq: mp->m_buf_workqueue);
599out:
600 return -ENOMEM;
601}
602
603STATIC void
604xfs_destroy_mount_workqueues(
605 struct xfs_mount *mp)
606{
607 destroy_workqueue(wq: mp->m_sync_workqueue);
608 destroy_workqueue(wq: mp->m_blockgc_wq);
609 destroy_workqueue(wq: mp->m_inodegc_wq);
610 destroy_workqueue(wq: mp->m_reclaim_workqueue);
611 destroy_workqueue(wq: mp->m_unwritten_workqueue);
612 destroy_workqueue(wq: mp->m_buf_workqueue);
613}
614
615static void
616xfs_flush_inodes_worker(
617 struct work_struct *work)
618{
619 struct xfs_mount *mp = container_of(work, struct xfs_mount,
620 m_flush_inodes_work);
621 struct super_block *sb = mp->m_super;
622
623 if (down_read_trylock(sem: &sb->s_umount)) {
624 sync_inodes_sb(sb);
625 up_read(sem: &sb->s_umount);
626 }
627}
628
629/*
630 * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
631 * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
632 * for IO to complete so that we effectively throttle multiple callers to the
633 * rate at which IO is completing.
634 */
635void
636xfs_flush_inodes(
637 struct xfs_mount *mp)
638{
639 /*
640 * If flush_work() returns true then that means we waited for a flush
641 * which was already in progress. Don't bother running another scan.
642 */
643 if (flush_work(work: &mp->m_flush_inodes_work))
644 return;
645
646 queue_work(wq: mp->m_sync_workqueue, work: &mp->m_flush_inodes_work);
647 flush_work(work: &mp->m_flush_inodes_work);
648}
649
650/* Catch misguided souls that try to use this interface on XFS */
651STATIC struct inode *
652xfs_fs_alloc_inode(
653 struct super_block *sb)
654{
655 BUG();
656 return NULL;
657}
658
659/*
660 * Now that the generic code is guaranteed not to be accessing
661 * the linux inode, we can inactivate and reclaim the inode.
662 */
663STATIC void
664xfs_fs_destroy_inode(
665 struct inode *inode)
666{
667 struct xfs_inode *ip = XFS_I(inode);
668
669 trace_xfs_destroy_inode(ip);
670
671 ASSERT(!rwsem_is_locked(&inode->i_rwsem));
672 XFS_STATS_INC(ip->i_mount, vn_rele);
673 XFS_STATS_INC(ip->i_mount, vn_remove);
674 xfs_inode_mark_reclaimable(ip);
675}
676
677static void
678xfs_fs_dirty_inode(
679 struct inode *inode,
680 int flags)
681{
682 struct xfs_inode *ip = XFS_I(inode);
683 struct xfs_mount *mp = ip->i_mount;
684 struct xfs_trans *tp;
685
686 if (!(inode->i_sb->s_flags & SB_LAZYTIME))
687 return;
688
689 /*
690 * Only do the timestamp update if the inode is dirty (I_DIRTY_SYNC)
691 * and has dirty timestamp (I_DIRTY_TIME). I_DIRTY_TIME can be passed
692 * in flags possibly together with I_DIRTY_SYNC.
693 */
694 if ((flags & ~I_DIRTY_TIME) != I_DIRTY_SYNC || !(flags & I_DIRTY_TIME))
695 return;
696
697 if (xfs_trans_alloc(mp, resp: &M_RES(mp)->tr_fsyncts, blocks: 0, rtextents: 0, flags: 0, tpp: &tp))
698 return;
699 xfs_ilock(ip, XFS_ILOCK_EXCL);
700 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
701 xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
702 xfs_trans_commit(tp);
703}
704
705/*
706 * Slab object creation initialisation for the XFS inode.
707 * This covers only the idempotent fields in the XFS inode;
708 * all other fields need to be initialised on allocation
709 * from the slab. This avoids the need to repeatedly initialise
710 * fields in the xfs inode that left in the initialise state
711 * when freeing the inode.
712 */
713STATIC void
714xfs_fs_inode_init_once(
715 void *inode)
716{
717 struct xfs_inode *ip = inode;
718
719 memset(ip, 0, sizeof(struct xfs_inode));
720
721 /* vfs inode */
722 inode_init_once(VFS_I(ip));
723
724 /* xfs inode */
725 atomic_set(v: &ip->i_pincount, i: 0);
726 spin_lock_init(&ip->i_flags_lock);
727
728 mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
729 "xfsino", ip->i_ino);
730}
731
732/*
733 * We do an unlocked check for XFS_IDONTCACHE here because we are already
734 * serialised against cache hits here via the inode->i_lock and igrab() in
735 * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
736 * racing with us, and it avoids needing to grab a spinlock here for every inode
737 * we drop the final reference on.
738 */
739STATIC int
740xfs_fs_drop_inode(
741 struct inode *inode)
742{
743 struct xfs_inode *ip = XFS_I(inode);
744
745 /*
746 * If this unlinked inode is in the middle of recovery, don't
747 * drop the inode just yet; log recovery will take care of
748 * that. See the comment for this inode flag.
749 */
750 if (ip->i_flags & XFS_IRECOVERY) {
751 ASSERT(xlog_recovery_needed(ip->i_mount->m_log));
752 return 0;
753 }
754
755 return generic_drop_inode(inode);
756}
757
758static void
759xfs_mount_free(
760 struct xfs_mount *mp)
761{
762 /*
763 * Free the buftargs here because blkdev_put needs to be called outside
764 * of sb->s_umount, which is held around the call to ->put_super.
765 */
766 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp)
767 xfs_free_buftarg(mp->m_logdev_targp);
768 if (mp->m_rtdev_targp)
769 xfs_free_buftarg(mp->m_rtdev_targp);
770 if (mp->m_ddev_targp)
771 xfs_free_buftarg(mp->m_ddev_targp);
772
773 debugfs_remove(dentry: mp->m_debugfs);
774 kfree(objp: mp->m_rtname);
775 kfree(objp: mp->m_logname);
776 kmem_free(ptr: mp);
777}
778
779STATIC int
780xfs_fs_sync_fs(
781 struct super_block *sb,
782 int wait)
783{
784 struct xfs_mount *mp = XFS_M(sb);
785 int error;
786
787 trace_xfs_fs_sync_fs(mp, __return_address);
788
789 /*
790 * Doing anything during the async pass would be counterproductive.
791 */
792 if (!wait)
793 return 0;
794
795 error = xfs_log_force(mp, XFS_LOG_SYNC);
796 if (error)
797 return error;
798
799 if (laptop_mode) {
800 /*
801 * The disk must be active because we're syncing.
802 * We schedule log work now (now that the disk is
803 * active) instead of later (when it might not be).
804 */
805 flush_delayed_work(dwork: &mp->m_log->l_work);
806 }
807
808 /*
809 * If we are called with page faults frozen out, it means we are about
810 * to freeze the transaction subsystem. Take the opportunity to shut
811 * down inodegc because once SB_FREEZE_FS is set it's too late to
812 * prevent inactivation races with freeze. The fs doesn't get called
813 * again by the freezing process until after SB_FREEZE_FS has been set,
814 * so it's now or never. Same logic applies to speculative allocation
815 * garbage collection.
816 *
817 * We don't care if this is a normal syncfs call that does this or
818 * freeze that does this - we can run this multiple times without issue
819 * and we won't race with a restart because a restart can only occur
820 * when the state is either SB_FREEZE_FS or SB_FREEZE_COMPLETE.
821 */
822 if (sb->s_writers.frozen == SB_FREEZE_PAGEFAULT) {
823 xfs_inodegc_stop(mp);
824 xfs_blockgc_stop(mp);
825 }
826
827 return 0;
828}
829
830STATIC int
831xfs_fs_statfs(
832 struct dentry *dentry,
833 struct kstatfs *statp)
834{
835 struct xfs_mount *mp = XFS_M(dentry->d_sb);
836 xfs_sb_t *sbp = &mp->m_sb;
837 struct xfs_inode *ip = XFS_I(inode: d_inode(dentry));
838 uint64_t fakeinos, id;
839 uint64_t icount;
840 uint64_t ifree;
841 uint64_t fdblocks;
842 xfs_extlen_t lsize;
843 int64_t ffree;
844
845 /*
846 * Expedite background inodegc but don't wait. We do not want to block
847 * here waiting hours for a billion extent file to be truncated.
848 */
849 xfs_inodegc_push(mp);
850
851 statp->f_type = XFS_SUPER_MAGIC;
852 statp->f_namelen = MAXNAMELEN - 1;
853
854 id = huge_encode_dev(dev: mp->m_ddev_targp->bt_dev);
855 statp->f_fsid = u64_to_fsid(v: id);
856
857 icount = percpu_counter_sum(fbc: &mp->m_icount);
858 ifree = percpu_counter_sum(fbc: &mp->m_ifree);
859 fdblocks = percpu_counter_sum(fbc: &mp->m_fdblocks);
860
861 spin_lock(lock: &mp->m_sb_lock);
862 statp->f_bsize = sbp->sb_blocksize;
863 lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
864 statp->f_blocks = sbp->sb_dblocks - lsize;
865 spin_unlock(lock: &mp->m_sb_lock);
866
867 /* make sure statp->f_bfree does not underflow */
868 statp->f_bfree = max_t(int64_t, 0,
869 fdblocks - xfs_fdblocks_unavailable(mp));
870 statp->f_bavail = statp->f_bfree;
871
872 fakeinos = XFS_FSB_TO_INO(mp, statp->f_bfree);
873 statp->f_files = min(icount + fakeinos, (uint64_t)XFS_MAXINUMBER);
874 if (M_IGEO(mp)->maxicount)
875 statp->f_files = min_t(typeof(statp->f_files),
876 statp->f_files,
877 M_IGEO(mp)->maxicount);
878
879 /* If sb_icount overshot maxicount, report actual allocation */
880 statp->f_files = max_t(typeof(statp->f_files),
881 statp->f_files,
882 sbp->sb_icount);
883
884 /* make sure statp->f_ffree does not underflow */
885 ffree = statp->f_files - (icount - ifree);
886 statp->f_ffree = max_t(int64_t, ffree, 0);
887
888
889 if ((ip->i_diflags & XFS_DIFLAG_PROJINHERIT) &&
890 ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
891 (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
892 xfs_qm_statvfs(ip, statp);
893
894 if (XFS_IS_REALTIME_MOUNT(mp) &&
895 (ip->i_diflags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME))) {
896 s64 freertx;
897
898 statp->f_blocks = sbp->sb_rblocks;
899 freertx = percpu_counter_sum_positive(fbc: &mp->m_frextents);
900 statp->f_bavail = statp->f_bfree = xfs_rtx_to_rtb(mp, freertx);
901 }
902
903 return 0;
904}
905
906STATIC void
907xfs_save_resvblks(struct xfs_mount *mp)
908{
909 uint64_t resblks = 0;
910
911 mp->m_resblks_save = mp->m_resblks;
912 xfs_reserve_blocks(mp, &resblks, NULL);
913}
914
915STATIC void
916xfs_restore_resvblks(struct xfs_mount *mp)
917{
918 uint64_t resblks;
919
920 if (mp->m_resblks_save) {
921 resblks = mp->m_resblks_save;
922 mp->m_resblks_save = 0;
923 } else
924 resblks = xfs_default_resblks(mp);
925
926 xfs_reserve_blocks(mp, &resblks, NULL);
927}
928
929/*
930 * Second stage of a freeze. The data is already frozen so we only
931 * need to take care of the metadata. Once that's done sync the superblock
932 * to the log to dirty it in case of a crash while frozen. This ensures that we
933 * will recover the unlinked inode lists on the next mount.
934 */
935STATIC int
936xfs_fs_freeze(
937 struct super_block *sb)
938{
939 struct xfs_mount *mp = XFS_M(sb);
940 unsigned int flags;
941 int ret;
942
943 /*
944 * The filesystem is now frozen far enough that memory reclaim
945 * cannot safely operate on the filesystem. Hence we need to
946 * set a GFP_NOFS context here to avoid recursion deadlocks.
947 */
948 flags = memalloc_nofs_save();
949 xfs_save_resvblks(mp);
950 ret = xfs_log_quiesce(mp);
951 memalloc_nofs_restore(flags);
952
953 /*
954 * For read-write filesystems, we need to restart the inodegc on error
955 * because we stopped it at SB_FREEZE_PAGEFAULT level and a thaw is not
956 * going to be run to restart it now. We are at SB_FREEZE_FS level
957 * here, so we can restart safely without racing with a stop in
958 * xfs_fs_sync_fs().
959 */
960 if (ret && !xfs_is_readonly(mp)) {
961 xfs_blockgc_start(mp);
962 xfs_inodegc_start(mp);
963 }
964
965 return ret;
966}
967
968STATIC int
969xfs_fs_unfreeze(
970 struct super_block *sb)
971{
972 struct xfs_mount *mp = XFS_M(sb);
973
974 xfs_restore_resvblks(mp);
975 xfs_log_work_queue(mp);
976
977 /*
978 * Don't reactivate the inodegc worker on a readonly filesystem because
979 * inodes are sent directly to reclaim. Don't reactivate the blockgc
980 * worker because there are no speculative preallocations on a readonly
981 * filesystem.
982 */
983 if (!xfs_is_readonly(mp)) {
984 xfs_blockgc_start(mp);
985 xfs_inodegc_start(mp);
986 }
987
988 return 0;
989}
990
991/*
992 * This function fills in xfs_mount_t fields based on mount args.
993 * Note: the superblock _has_ now been read in.
994 */
995STATIC int
996xfs_finish_flags(
997 struct xfs_mount *mp)
998{
999 /* Fail a mount where the logbuf is smaller than the log stripe */
1000 if (xfs_has_logv2(mp)) {
1001 if (mp->m_logbsize <= 0 &&
1002 mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1003 mp->m_logbsize = mp->m_sb.sb_logsunit;
1004 } else if (mp->m_logbsize > 0 &&
1005 mp->m_logbsize < mp->m_sb.sb_logsunit) {
1006 xfs_warn(mp,
1007 "logbuf size must be greater than or equal to log stripe size");
1008 return -EINVAL;
1009 }
1010 } else {
1011 /* Fail a mount if the logbuf is larger than 32K */
1012 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1013 xfs_warn(mp,
1014 "logbuf size for version 1 logs must be 16K or 32K");
1015 return -EINVAL;
1016 }
1017 }
1018
1019 /*
1020 * V5 filesystems always use attr2 format for attributes.
1021 */
1022 if (xfs_has_crc(mp) && xfs_has_noattr2(mp)) {
1023 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
1024 "attr2 is always enabled for V5 filesystems.");
1025 return -EINVAL;
1026 }
1027
1028 /*
1029 * prohibit r/w mounts of read-only filesystems
1030 */
1031 if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !xfs_is_readonly(mp)) {
1032 xfs_warn(mp,
1033 "cannot mount a read-only filesystem as read-write");
1034 return -EROFS;
1035 }
1036
1037 if ((mp->m_qflags & XFS_GQUOTA_ACCT) &&
1038 (mp->m_qflags & XFS_PQUOTA_ACCT) &&
1039 !xfs_has_pquotino(mp)) {
1040 xfs_warn(mp,
1041 "Super block does not support project and group quota together");
1042 return -EINVAL;
1043 }
1044
1045 return 0;
1046}
1047
1048static int
1049xfs_init_percpu_counters(
1050 struct xfs_mount *mp)
1051{
1052 int error;
1053
1054 error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1055 if (error)
1056 return -ENOMEM;
1057
1058 error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1059 if (error)
1060 goto free_icount;
1061
1062 error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1063 if (error)
1064 goto free_ifree;
1065
1066 error = percpu_counter_init(&mp->m_delalloc_blks, 0, GFP_KERNEL);
1067 if (error)
1068 goto free_fdblocks;
1069
1070 error = percpu_counter_init(&mp->m_frextents, 0, GFP_KERNEL);
1071 if (error)
1072 goto free_delalloc;
1073
1074 return 0;
1075
1076free_delalloc:
1077 percpu_counter_destroy(fbc: &mp->m_delalloc_blks);
1078free_fdblocks:
1079 percpu_counter_destroy(fbc: &mp->m_fdblocks);
1080free_ifree:
1081 percpu_counter_destroy(fbc: &mp->m_ifree);
1082free_icount:
1083 percpu_counter_destroy(fbc: &mp->m_icount);
1084 return -ENOMEM;
1085}
1086
1087void
1088xfs_reinit_percpu_counters(
1089 struct xfs_mount *mp)
1090{
1091 percpu_counter_set(fbc: &mp->m_icount, amount: mp->m_sb.sb_icount);
1092 percpu_counter_set(fbc: &mp->m_ifree, amount: mp->m_sb.sb_ifree);
1093 percpu_counter_set(fbc: &mp->m_fdblocks, amount: mp->m_sb.sb_fdblocks);
1094 percpu_counter_set(fbc: &mp->m_frextents, amount: mp->m_sb.sb_frextents);
1095}
1096
1097static void
1098xfs_destroy_percpu_counters(
1099 struct xfs_mount *mp)
1100{
1101 percpu_counter_destroy(fbc: &mp->m_icount);
1102 percpu_counter_destroy(fbc: &mp->m_ifree);
1103 percpu_counter_destroy(fbc: &mp->m_fdblocks);
1104 ASSERT(xfs_is_shutdown(mp) ||
1105 percpu_counter_sum(&mp->m_delalloc_blks) == 0);
1106 percpu_counter_destroy(fbc: &mp->m_delalloc_blks);
1107 percpu_counter_destroy(fbc: &mp->m_frextents);
1108}
1109
1110static int
1111xfs_inodegc_init_percpu(
1112 struct xfs_mount *mp)
1113{
1114 struct xfs_inodegc *gc;
1115 int cpu;
1116
1117 mp->m_inodegc = alloc_percpu(struct xfs_inodegc);
1118 if (!mp->m_inodegc)
1119 return -ENOMEM;
1120
1121 for_each_possible_cpu(cpu) {
1122 gc = per_cpu_ptr(mp->m_inodegc, cpu);
1123 gc->cpu = cpu;
1124 gc->mp = mp;
1125 init_llist_head(list: &gc->list);
1126 gc->items = 0;
1127 gc->error = 0;
1128 INIT_DELAYED_WORK(&gc->work, xfs_inodegc_worker);
1129 }
1130 return 0;
1131}
1132
1133static void
1134xfs_inodegc_free_percpu(
1135 struct xfs_mount *mp)
1136{
1137 if (!mp->m_inodegc)
1138 return;
1139 free_percpu(pdata: mp->m_inodegc);
1140}
1141
1142static void
1143xfs_fs_put_super(
1144 struct super_block *sb)
1145{
1146 struct xfs_mount *mp = XFS_M(sb);
1147
1148 xfs_notice(mp, "Unmounting Filesystem %pU", &mp->m_sb.sb_uuid);
1149 xfs_filestream_unmount(mp);
1150 xfs_unmountfs(mp);
1151
1152 xfs_freesb(mp);
1153 xchk_mount_stats_free(mp);
1154 free_percpu(pdata: mp->m_stats.xs_stats);
1155 xfs_inodegc_free_percpu(mp);
1156 xfs_destroy_percpu_counters(mp);
1157 xfs_destroy_mount_workqueues(mp);
1158 xfs_shutdown_devices(mp);
1159}
1160
1161static long
1162xfs_fs_nr_cached_objects(
1163 struct super_block *sb,
1164 struct shrink_control *sc)
1165{
1166 /* Paranoia: catch incorrect calls during mount setup or teardown */
1167 if (WARN_ON_ONCE(!sb->s_fs_info))
1168 return 0;
1169 return xfs_reclaim_inodes_count(XFS_M(sb));
1170}
1171
1172static long
1173xfs_fs_free_cached_objects(
1174 struct super_block *sb,
1175 struct shrink_control *sc)
1176{
1177 return xfs_reclaim_inodes_nr(XFS_M(sb), nr_to_scan: sc->nr_to_scan);
1178}
1179
1180static void
1181xfs_fs_shutdown(
1182 struct super_block *sb)
1183{
1184 xfs_force_shutdown(XFS_M(sb), SHUTDOWN_DEVICE_REMOVED);
1185}
1186
1187static const struct super_operations xfs_super_operations = {
1188 .alloc_inode = xfs_fs_alloc_inode,
1189 .destroy_inode = xfs_fs_destroy_inode,
1190 .dirty_inode = xfs_fs_dirty_inode,
1191 .drop_inode = xfs_fs_drop_inode,
1192 .put_super = xfs_fs_put_super,
1193 .sync_fs = xfs_fs_sync_fs,
1194 .freeze_fs = xfs_fs_freeze,
1195 .unfreeze_fs = xfs_fs_unfreeze,
1196 .statfs = xfs_fs_statfs,
1197 .show_options = xfs_fs_show_options,
1198 .nr_cached_objects = xfs_fs_nr_cached_objects,
1199 .free_cached_objects = xfs_fs_free_cached_objects,
1200 .shutdown = xfs_fs_shutdown,
1201};
1202
1203static int
1204suffix_kstrtoint(
1205 const char *s,
1206 unsigned int base,
1207 int *res)
1208{
1209 int last, shift_left_factor = 0, _res;
1210 char *value;
1211 int ret = 0;
1212
1213 value = kstrdup(s, GFP_KERNEL);
1214 if (!value)
1215 return -ENOMEM;
1216
1217 last = strlen(value) - 1;
1218 if (value[last] == 'K' || value[last] == 'k') {
1219 shift_left_factor = 10;
1220 value[last] = '\0';
1221 }
1222 if (value[last] == 'M' || value[last] == 'm') {
1223 shift_left_factor = 20;
1224 value[last] = '\0';
1225 }
1226 if (value[last] == 'G' || value[last] == 'g') {
1227 shift_left_factor = 30;
1228 value[last] = '\0';
1229 }
1230
1231 if (kstrtoint(s: value, base, res: &_res))
1232 ret = -EINVAL;
1233 kfree(objp: value);
1234 *res = _res << shift_left_factor;
1235 return ret;
1236}
1237
1238static inline void
1239xfs_fs_warn_deprecated(
1240 struct fs_context *fc,
1241 struct fs_parameter *param,
1242 uint64_t flag,
1243 bool value)
1244{
1245 /* Don't print the warning if reconfiguring and current mount point
1246 * already had the flag set
1247 */
1248 if ((fc->purpose & FS_CONTEXT_FOR_RECONFIGURE) &&
1249 !!(XFS_M(fc->root->d_sb)->m_features & flag) == value)
1250 return;
1251 xfs_warn(fc->s_fs_info, "%s mount option is deprecated.", param->key);
1252}
1253
1254/*
1255 * Set mount state from a mount option.
1256 *
1257 * NOTE: mp->m_super is NULL here!
1258 */
1259static int
1260xfs_fs_parse_param(
1261 struct fs_context *fc,
1262 struct fs_parameter *param)
1263{
1264 struct xfs_mount *parsing_mp = fc->s_fs_info;
1265 struct fs_parse_result result;
1266 int size = 0;
1267 int opt;
1268
1269 opt = fs_parse(fc, desc: xfs_fs_parameters, param, result: &result);
1270 if (opt < 0)
1271 return opt;
1272
1273 switch (opt) {
1274 case Opt_logbufs:
1275 parsing_mp->m_logbufs = result.uint_32;
1276 return 0;
1277 case Opt_logbsize:
1278 if (suffix_kstrtoint(s: param->string, base: 10, res: &parsing_mp->m_logbsize))
1279 return -EINVAL;
1280 return 0;
1281 case Opt_logdev:
1282 kfree(objp: parsing_mp->m_logname);
1283 parsing_mp->m_logname = kstrdup(s: param->string, GFP_KERNEL);
1284 if (!parsing_mp->m_logname)
1285 return -ENOMEM;
1286 return 0;
1287 case Opt_rtdev:
1288 kfree(objp: parsing_mp->m_rtname);
1289 parsing_mp->m_rtname = kstrdup(s: param->string, GFP_KERNEL);
1290 if (!parsing_mp->m_rtname)
1291 return -ENOMEM;
1292 return 0;
1293 case Opt_allocsize:
1294 if (suffix_kstrtoint(s: param->string, base: 10, res: &size))
1295 return -EINVAL;
1296 parsing_mp->m_allocsize_log = ffs(size) - 1;
1297 parsing_mp->m_features |= XFS_FEAT_ALLOCSIZE;
1298 return 0;
1299 case Opt_grpid:
1300 case Opt_bsdgroups:
1301 parsing_mp->m_features |= XFS_FEAT_GRPID;
1302 return 0;
1303 case Opt_nogrpid:
1304 case Opt_sysvgroups:
1305 parsing_mp->m_features &= ~XFS_FEAT_GRPID;
1306 return 0;
1307 case Opt_wsync:
1308 parsing_mp->m_features |= XFS_FEAT_WSYNC;
1309 return 0;
1310 case Opt_norecovery:
1311 parsing_mp->m_features |= XFS_FEAT_NORECOVERY;
1312 return 0;
1313 case Opt_noalign:
1314 parsing_mp->m_features |= XFS_FEAT_NOALIGN;
1315 return 0;
1316 case Opt_swalloc:
1317 parsing_mp->m_features |= XFS_FEAT_SWALLOC;
1318 return 0;
1319 case Opt_sunit:
1320 parsing_mp->m_dalign = result.uint_32;
1321 return 0;
1322 case Opt_swidth:
1323 parsing_mp->m_swidth = result.uint_32;
1324 return 0;
1325 case Opt_inode32:
1326 parsing_mp->m_features |= XFS_FEAT_SMALL_INUMS;
1327 return 0;
1328 case Opt_inode64:
1329 parsing_mp->m_features &= ~XFS_FEAT_SMALL_INUMS;
1330 return 0;
1331 case Opt_nouuid:
1332 parsing_mp->m_features |= XFS_FEAT_NOUUID;
1333 return 0;
1334 case Opt_largeio:
1335 parsing_mp->m_features |= XFS_FEAT_LARGE_IOSIZE;
1336 return 0;
1337 case Opt_nolargeio:
1338 parsing_mp->m_features &= ~XFS_FEAT_LARGE_IOSIZE;
1339 return 0;
1340 case Opt_filestreams:
1341 parsing_mp->m_features |= XFS_FEAT_FILESTREAMS;
1342 return 0;
1343 case Opt_noquota:
1344 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
1345 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
1346 return 0;
1347 case Opt_quota:
1348 case Opt_uquota:
1349 case Opt_usrquota:
1350 parsing_mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ENFD);
1351 return 0;
1352 case Opt_qnoenforce:
1353 case Opt_uqnoenforce:
1354 parsing_mp->m_qflags |= XFS_UQUOTA_ACCT;
1355 parsing_mp->m_qflags &= ~XFS_UQUOTA_ENFD;
1356 return 0;
1357 case Opt_pquota:
1358 case Opt_prjquota:
1359 parsing_mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ENFD);
1360 return 0;
1361 case Opt_pqnoenforce:
1362 parsing_mp->m_qflags |= XFS_PQUOTA_ACCT;
1363 parsing_mp->m_qflags &= ~XFS_PQUOTA_ENFD;
1364 return 0;
1365 case Opt_gquota:
1366 case Opt_grpquota:
1367 parsing_mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ENFD);
1368 return 0;
1369 case Opt_gqnoenforce:
1370 parsing_mp->m_qflags |= XFS_GQUOTA_ACCT;
1371 parsing_mp->m_qflags &= ~XFS_GQUOTA_ENFD;
1372 return 0;
1373 case Opt_discard:
1374 parsing_mp->m_features |= XFS_FEAT_DISCARD;
1375 return 0;
1376 case Opt_nodiscard:
1377 parsing_mp->m_features &= ~XFS_FEAT_DISCARD;
1378 return 0;
1379#ifdef CONFIG_FS_DAX
1380 case Opt_dax:
1381 xfs_mount_set_dax_mode(mp: parsing_mp, mode: XFS_DAX_ALWAYS);
1382 return 0;
1383 case Opt_dax_enum:
1384 xfs_mount_set_dax_mode(mp: parsing_mp, mode: result.uint_32);
1385 return 0;
1386#endif
1387 /* Following mount options will be removed in September 2025 */
1388 case Opt_ikeep:
1389 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_IKEEP, value: true);
1390 parsing_mp->m_features |= XFS_FEAT_IKEEP;
1391 return 0;
1392 case Opt_noikeep:
1393 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_IKEEP, value: false);
1394 parsing_mp->m_features &= ~XFS_FEAT_IKEEP;
1395 return 0;
1396 case Opt_attr2:
1397 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_ATTR2, value: true);
1398 parsing_mp->m_features |= XFS_FEAT_ATTR2;
1399 return 0;
1400 case Opt_noattr2:
1401 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_NOATTR2, value: true);
1402 parsing_mp->m_features |= XFS_FEAT_NOATTR2;
1403 return 0;
1404 default:
1405 xfs_warn(parsing_mp, "unknown mount option [%s].", param->key);
1406 return -EINVAL;
1407 }
1408
1409 return 0;
1410}
1411
1412static int
1413xfs_fs_validate_params(
1414 struct xfs_mount *mp)
1415{
1416 /* No recovery flag requires a read-only mount */
1417 if (xfs_has_norecovery(mp) && !xfs_is_readonly(mp)) {
1418 xfs_warn(mp, "no-recovery mounts must be read-only.");
1419 return -EINVAL;
1420 }
1421
1422 /*
1423 * We have not read the superblock at this point, so only the attr2
1424 * mount option can set the attr2 feature by this stage.
1425 */
1426 if (xfs_has_attr2(mp) && xfs_has_noattr2(mp)) {
1427 xfs_warn(mp, "attr2 and noattr2 cannot both be specified.");
1428 return -EINVAL;
1429 }
1430
1431
1432 if (xfs_has_noalign(mp) && (mp->m_dalign || mp->m_swidth)) {
1433 xfs_warn(mp,
1434 "sunit and swidth options incompatible with the noalign option");
1435 return -EINVAL;
1436 }
1437
1438 if (!IS_ENABLED(CONFIG_XFS_QUOTA) && mp->m_qflags != 0) {
1439 xfs_warn(mp, "quota support not available in this kernel.");
1440 return -EINVAL;
1441 }
1442
1443 if ((mp->m_dalign && !mp->m_swidth) ||
1444 (!mp->m_dalign && mp->m_swidth)) {
1445 xfs_warn(mp, "sunit and swidth must be specified together");
1446 return -EINVAL;
1447 }
1448
1449 if (mp->m_dalign && (mp->m_swidth % mp->m_dalign != 0)) {
1450 xfs_warn(mp,
1451 "stripe width (%d) must be a multiple of the stripe unit (%d)",
1452 mp->m_swidth, mp->m_dalign);
1453 return -EINVAL;
1454 }
1455
1456 if (mp->m_logbufs != -1 &&
1457 mp->m_logbufs != 0 &&
1458 (mp->m_logbufs < XLOG_MIN_ICLOGS ||
1459 mp->m_logbufs > XLOG_MAX_ICLOGS)) {
1460 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
1461 mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
1462 return -EINVAL;
1463 }
1464
1465 if (mp->m_logbsize != -1 &&
1466 mp->m_logbsize != 0 &&
1467 (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
1468 mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
1469 !is_power_of_2(mp->m_logbsize))) {
1470 xfs_warn(mp,
1471 "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
1472 mp->m_logbsize);
1473 return -EINVAL;
1474 }
1475
1476 if (xfs_has_allocsize(mp) &&
1477 (mp->m_allocsize_log > XFS_MAX_IO_LOG ||
1478 mp->m_allocsize_log < XFS_MIN_IO_LOG)) {
1479 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
1480 mp->m_allocsize_log, XFS_MIN_IO_LOG, XFS_MAX_IO_LOG);
1481 return -EINVAL;
1482 }
1483
1484 return 0;
1485}
1486
1487struct dentry *
1488xfs_debugfs_mkdir(
1489 const char *name,
1490 struct dentry *parent)
1491{
1492 struct dentry *child;
1493
1494 /* Apparently we're expected to ignore error returns?? */
1495 child = debugfs_create_dir(name, parent);
1496 if (IS_ERR(ptr: child))
1497 return NULL;
1498
1499 return child;
1500}
1501
1502static int
1503xfs_fs_fill_super(
1504 struct super_block *sb,
1505 struct fs_context *fc)
1506{
1507 struct xfs_mount *mp = sb->s_fs_info;
1508 struct inode *root;
1509 int flags = 0, error;
1510
1511 mp->m_super = sb;
1512
1513 error = xfs_fs_validate_params(mp);
1514 if (error)
1515 return error;
1516
1517 sb_min_blocksize(sb, BBSIZE);
1518 sb->s_xattr = xfs_xattr_handlers;
1519 sb->s_export_op = &xfs_export_operations;
1520#ifdef CONFIG_XFS_QUOTA
1521 sb->s_qcop = &xfs_quotactl_operations;
1522 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1523#endif
1524 sb->s_op = &xfs_super_operations;
1525
1526 /*
1527 * Delay mount work if the debug hook is set. This is debug
1528 * instrumention to coordinate simulation of xfs mount failures with
1529 * VFS superblock operations
1530 */
1531 if (xfs_globals.mount_delay) {
1532 xfs_notice(mp, "Delaying mount for %d seconds.",
1533 xfs_globals.mount_delay);
1534 msleep(msecs: xfs_globals.mount_delay * 1000);
1535 }
1536
1537 if (fc->sb_flags & SB_SILENT)
1538 flags |= XFS_MFSI_QUIET;
1539
1540 error = xfs_open_devices(mp);
1541 if (error)
1542 return error;
1543
1544 if (xfs_debugfs) {
1545 mp->m_debugfs = xfs_debugfs_mkdir(name: mp->m_super->s_id,
1546 parent: xfs_debugfs);
1547 } else {
1548 mp->m_debugfs = NULL;
1549 }
1550
1551 error = xfs_init_mount_workqueues(mp);
1552 if (error)
1553 goto out_shutdown_devices;
1554
1555 error = xfs_init_percpu_counters(mp);
1556 if (error)
1557 goto out_destroy_workqueues;
1558
1559 error = xfs_inodegc_init_percpu(mp);
1560 if (error)
1561 goto out_destroy_counters;
1562
1563 /* Allocate stats memory before we do operations that might use it */
1564 mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1565 if (!mp->m_stats.xs_stats) {
1566 error = -ENOMEM;
1567 goto out_destroy_inodegc;
1568 }
1569
1570 error = xchk_mount_stats_alloc(mp);
1571 if (error)
1572 goto out_free_stats;
1573
1574 error = xfs_readsb(mp, flags);
1575 if (error)
1576 goto out_free_scrub_stats;
1577
1578 error = xfs_finish_flags(mp);
1579 if (error)
1580 goto out_free_sb;
1581
1582 error = xfs_setup_devices(mp);
1583 if (error)
1584 goto out_free_sb;
1585
1586 /* V4 support is undergoing deprecation. */
1587 if (!xfs_has_crc(mp)) {
1588#ifdef CONFIG_XFS_SUPPORT_V4
1589 xfs_warn_once(mp,
1590 "Deprecated V4 format (crc=0) will not be supported after September 2030.");
1591#else
1592 xfs_warn(mp,
1593 "Deprecated V4 format (crc=0) not supported by kernel.");
1594 error = -EINVAL;
1595 goto out_free_sb;
1596#endif
1597 }
1598
1599 /* ASCII case insensitivity is undergoing deprecation. */
1600 if (xfs_has_asciici(mp)) {
1601#ifdef CONFIG_XFS_SUPPORT_ASCII_CI
1602 xfs_warn_once(mp,
1603 "Deprecated ASCII case-insensitivity feature (ascii-ci=1) will not be supported after September 2030.");
1604#else
1605 xfs_warn(mp,
1606 "Deprecated ASCII case-insensitivity feature (ascii-ci=1) not supported by kernel.");
1607 error = -EINVAL;
1608 goto out_free_sb;
1609#endif
1610 }
1611
1612 /* Filesystem claims it needs repair, so refuse the mount. */
1613 if (xfs_has_needsrepair(mp)) {
1614 xfs_warn(mp, "Filesystem needs repair. Please run xfs_repair.");
1615 error = -EFSCORRUPTED;
1616 goto out_free_sb;
1617 }
1618
1619 /*
1620 * Don't touch the filesystem if a user tool thinks it owns the primary
1621 * superblock. mkfs doesn't clear the flag from secondary supers, so
1622 * we don't check them at all.
1623 */
1624 if (mp->m_sb.sb_inprogress) {
1625 xfs_warn(mp, "Offline file system operation in progress!");
1626 error = -EFSCORRUPTED;
1627 goto out_free_sb;
1628 }
1629
1630 /*
1631 * Until this is fixed only page-sized or smaller data blocks work.
1632 */
1633 if (mp->m_sb.sb_blocksize > PAGE_SIZE) {
1634 xfs_warn(mp,
1635 "File system with blocksize %d bytes. "
1636 "Only pagesize (%ld) or less will currently work.",
1637 mp->m_sb.sb_blocksize, PAGE_SIZE);
1638 error = -ENOSYS;
1639 goto out_free_sb;
1640 }
1641
1642 /* Ensure this filesystem fits in the page cache limits */
1643 if (xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_dblocks) ||
1644 xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_rblocks)) {
1645 xfs_warn(mp,
1646 "file system too large to be mounted on this system.");
1647 error = -EFBIG;
1648 goto out_free_sb;
1649 }
1650
1651 /*
1652 * XFS block mappings use 54 bits to store the logical block offset.
1653 * This should suffice to handle the maximum file size that the VFS
1654 * supports (currently 2^63 bytes on 64-bit and ULONG_MAX << PAGE_SHIFT
1655 * bytes on 32-bit), but as XFS and VFS have gotten the s_maxbytes
1656 * calculation wrong on 32-bit kernels in the past, we'll add a WARN_ON
1657 * to check this assertion.
1658 *
1659 * Avoid integer overflow by comparing the maximum bmbt offset to the
1660 * maximum pagecache offset in units of fs blocks.
1661 */
1662 if (!xfs_verify_fileoff(mp, XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE))) {
1663 xfs_warn(mp,
1664"MAX_LFS_FILESIZE block offset (%llu) exceeds extent map maximum (%llu)!",
1665 XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE),
1666 XFS_MAX_FILEOFF);
1667 error = -EINVAL;
1668 goto out_free_sb;
1669 }
1670
1671 error = xfs_filestream_mount(mp);
1672 if (error)
1673 goto out_free_sb;
1674
1675 /*
1676 * we must configure the block size in the superblock before we run the
1677 * full mount process as the mount process can lookup and cache inodes.
1678 */
1679 sb->s_magic = XFS_SUPER_MAGIC;
1680 sb->s_blocksize = mp->m_sb.sb_blocksize;
1681 sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1682 sb->s_maxbytes = MAX_LFS_FILESIZE;
1683 sb->s_max_links = XFS_MAXLINK;
1684 sb->s_time_gran = 1;
1685 if (xfs_has_bigtime(mp)) {
1686 sb->s_time_min = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MIN);
1687 sb->s_time_max = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MAX);
1688 } else {
1689 sb->s_time_min = XFS_LEGACY_TIME_MIN;
1690 sb->s_time_max = XFS_LEGACY_TIME_MAX;
1691 }
1692 trace_xfs_inode_timestamp_range(mp, min: sb->s_time_min, max: sb->s_time_max);
1693 sb->s_iflags |= SB_I_CGROUPWB;
1694
1695 set_posix_acl_flag(sb);
1696
1697 /* version 5 superblocks support inode version counters. */
1698 if (xfs_has_crc(mp))
1699 sb->s_flags |= SB_I_VERSION;
1700
1701 if (xfs_has_dax_always(mp)) {
1702 error = xfs_setup_dax_always(mp);
1703 if (error)
1704 goto out_filestream_unmount;
1705 }
1706
1707 if (xfs_has_discard(mp) && !bdev_max_discard_sectors(bdev: sb->s_bdev)) {
1708 xfs_warn(mp,
1709 "mounting with \"discard\" option, but the device does not support discard");
1710 mp->m_features &= ~XFS_FEAT_DISCARD;
1711 }
1712
1713 if (xfs_has_reflink(mp)) {
1714 if (mp->m_sb.sb_rblocks) {
1715 xfs_alert(mp,
1716 "reflink not compatible with realtime device!");
1717 error = -EINVAL;
1718 goto out_filestream_unmount;
1719 }
1720
1721 if (xfs_globals.always_cow) {
1722 xfs_info(mp, "using DEBUG-only always_cow mode.");
1723 mp->m_always_cow = true;
1724 }
1725 }
1726
1727 if (xfs_has_rmapbt(mp) && mp->m_sb.sb_rblocks) {
1728 xfs_alert(mp,
1729 "reverse mapping btree not compatible with realtime device!");
1730 error = -EINVAL;
1731 goto out_filestream_unmount;
1732 }
1733
1734 error = xfs_mountfs(mp);
1735 if (error)
1736 goto out_filestream_unmount;
1737
1738 root = igrab(VFS_I(ip: mp->m_rootip));
1739 if (!root) {
1740 error = -ENOENT;
1741 goto out_unmount;
1742 }
1743 sb->s_root = d_make_root(root);
1744 if (!sb->s_root) {
1745 error = -ENOMEM;
1746 goto out_unmount;
1747 }
1748
1749 return 0;
1750
1751 out_filestream_unmount:
1752 xfs_filestream_unmount(mp);
1753 out_free_sb:
1754 xfs_freesb(mp);
1755 out_free_scrub_stats:
1756 xchk_mount_stats_free(mp);
1757 out_free_stats:
1758 free_percpu(pdata: mp->m_stats.xs_stats);
1759 out_destroy_inodegc:
1760 xfs_inodegc_free_percpu(mp);
1761 out_destroy_counters:
1762 xfs_destroy_percpu_counters(mp);
1763 out_destroy_workqueues:
1764 xfs_destroy_mount_workqueues(mp);
1765 out_shutdown_devices:
1766 xfs_shutdown_devices(mp);
1767 return error;
1768
1769 out_unmount:
1770 xfs_filestream_unmount(mp);
1771 xfs_unmountfs(mp);
1772 goto out_free_sb;
1773}
1774
1775static int
1776xfs_fs_get_tree(
1777 struct fs_context *fc)
1778{
1779 return get_tree_bdev(fc, fill_super: xfs_fs_fill_super);
1780}
1781
1782static int
1783xfs_remount_rw(
1784 struct xfs_mount *mp)
1785{
1786 struct xfs_sb *sbp = &mp->m_sb;
1787 int error;
1788
1789 if (xfs_has_norecovery(mp)) {
1790 xfs_warn(mp,
1791 "ro->rw transition prohibited on norecovery mount");
1792 return -EINVAL;
1793 }
1794
1795 if (xfs_sb_is_v5(sbp) &&
1796 xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1797 xfs_warn(mp,
1798 "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1799 (sbp->sb_features_ro_compat &
1800 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1801 return -EINVAL;
1802 }
1803
1804 clear_bit(XFS_OPSTATE_READONLY, addr: &mp->m_opstate);
1805
1806 /*
1807 * If this is the first remount to writeable state we might have some
1808 * superblock changes to update.
1809 */
1810 if (mp->m_update_sb) {
1811 error = xfs_sync_sb(mp, false);
1812 if (error) {
1813 xfs_warn(mp, "failed to write sb changes");
1814 return error;
1815 }
1816 mp->m_update_sb = false;
1817 }
1818
1819 /*
1820 * Fill out the reserve pool if it is empty. Use the stashed value if
1821 * it is non-zero, otherwise go with the default.
1822 */
1823 xfs_restore_resvblks(mp);
1824 xfs_log_work_queue(mp);
1825 xfs_blockgc_start(mp);
1826
1827 /* Create the per-AG metadata reservation pool .*/
1828 error = xfs_fs_reserve_ag_blocks(mp);
1829 if (error && error != -ENOSPC)
1830 return error;
1831
1832 /* Re-enable the background inode inactivation worker. */
1833 xfs_inodegc_start(mp);
1834
1835 return 0;
1836}
1837
1838static int
1839xfs_remount_ro(
1840 struct xfs_mount *mp)
1841{
1842 struct xfs_icwalk icw = {
1843 .icw_flags = XFS_ICWALK_FLAG_SYNC,
1844 };
1845 int error;
1846
1847 /* Flush all the dirty data to disk. */
1848 error = sync_filesystem(mp->m_super);
1849 if (error)
1850 return error;
1851
1852 /*
1853 * Cancel background eofb scanning so it cannot race with the final
1854 * log force+buftarg wait and deadlock the remount.
1855 */
1856 xfs_blockgc_stop(mp);
1857
1858 /*
1859 * Clear out all remaining COW staging extents and speculative post-EOF
1860 * preallocations so that we don't leave inodes requiring inactivation
1861 * cleanups during reclaim on a read-only mount. We must process every
1862 * cached inode, so this requires a synchronous cache scan.
1863 */
1864 error = xfs_blockgc_free_space(mp, icm: &icw);
1865 if (error) {
1866 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1867 return error;
1868 }
1869
1870 /*
1871 * Stop the inodegc background worker. xfs_fs_reconfigure already
1872 * flushed all pending inodegc work when it sync'd the filesystem.
1873 * The VFS holds s_umount, so we know that inodes cannot enter
1874 * xfs_fs_destroy_inode during a remount operation. In readonly mode
1875 * we send inodes straight to reclaim, so no inodes will be queued.
1876 */
1877 xfs_inodegc_stop(mp);
1878
1879 /* Free the per-AG metadata reservation pool. */
1880 error = xfs_fs_unreserve_ag_blocks(mp);
1881 if (error) {
1882 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1883 return error;
1884 }
1885
1886 /*
1887 * Before we sync the metadata, we need to free up the reserve block
1888 * pool so that the used block count in the superblock on disk is
1889 * correct at the end of the remount. Stash the current* reserve pool
1890 * size so that if we get remounted rw, we can return it to the same
1891 * size.
1892 */
1893 xfs_save_resvblks(mp);
1894
1895 xfs_log_clean(mp);
1896 set_bit(XFS_OPSTATE_READONLY, addr: &mp->m_opstate);
1897
1898 return 0;
1899}
1900
1901/*
1902 * Logically we would return an error here to prevent users from believing
1903 * they might have changed mount options using remount which can't be changed.
1904 *
1905 * But unfortunately mount(8) adds all options from mtab and fstab to the mount
1906 * arguments in some cases so we can't blindly reject options, but have to
1907 * check for each specified option if it actually differs from the currently
1908 * set option and only reject it if that's the case.
1909 *
1910 * Until that is implemented we return success for every remount request, and
1911 * silently ignore all options that we can't actually change.
1912 */
1913static int
1914xfs_fs_reconfigure(
1915 struct fs_context *fc)
1916{
1917 struct xfs_mount *mp = XFS_M(fc->root->d_sb);
1918 struct xfs_mount *new_mp = fc->s_fs_info;
1919 int flags = fc->sb_flags;
1920 int error;
1921
1922 /* version 5 superblocks always support version counters. */
1923 if (xfs_has_crc(mp))
1924 fc->sb_flags |= SB_I_VERSION;
1925
1926 error = xfs_fs_validate_params(mp: new_mp);
1927 if (error)
1928 return error;
1929
1930 /* inode32 -> inode64 */
1931 if (xfs_has_small_inums(mp) && !xfs_has_small_inums(mp: new_mp)) {
1932 mp->m_features &= ~XFS_FEAT_SMALL_INUMS;
1933 mp->m_maxagi = xfs_set_inode_alloc(mp, mp->m_sb.sb_agcount);
1934 }
1935
1936 /* inode64 -> inode32 */
1937 if (!xfs_has_small_inums(mp) && xfs_has_small_inums(mp: new_mp)) {
1938 mp->m_features |= XFS_FEAT_SMALL_INUMS;
1939 mp->m_maxagi = xfs_set_inode_alloc(mp, mp->m_sb.sb_agcount);
1940 }
1941
1942 /* ro -> rw */
1943 if (xfs_is_readonly(mp) && !(flags & SB_RDONLY)) {
1944 error = xfs_remount_rw(mp);
1945 if (error)
1946 return error;
1947 }
1948
1949 /* rw -> ro */
1950 if (!xfs_is_readonly(mp) && (flags & SB_RDONLY)) {
1951 error = xfs_remount_ro(mp);
1952 if (error)
1953 return error;
1954 }
1955
1956 return 0;
1957}
1958
1959static void
1960xfs_fs_free(
1961 struct fs_context *fc)
1962{
1963 struct xfs_mount *mp = fc->s_fs_info;
1964
1965 /*
1966 * mp is stored in the fs_context when it is initialized.
1967 * mp is transferred to the superblock on a successful mount,
1968 * but if an error occurs before the transfer we have to free
1969 * it here.
1970 */
1971 if (mp)
1972 xfs_mount_free(mp);
1973}
1974
1975static const struct fs_context_operations xfs_context_ops = {
1976 .parse_param = xfs_fs_parse_param,
1977 .get_tree = xfs_fs_get_tree,
1978 .reconfigure = xfs_fs_reconfigure,
1979 .free = xfs_fs_free,
1980};
1981
1982static int xfs_init_fs_context(
1983 struct fs_context *fc)
1984{
1985 struct xfs_mount *mp;
1986
1987 mp = kmem_alloc(sizeof(struct xfs_mount), KM_ZERO);
1988 if (!mp)
1989 return -ENOMEM;
1990
1991 spin_lock_init(&mp->m_sb_lock);
1992 INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC);
1993 spin_lock_init(&mp->m_perag_lock);
1994 mutex_init(&mp->m_growlock);
1995 INIT_WORK(&mp->m_flush_inodes_work, xfs_flush_inodes_worker);
1996 INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1997 mp->m_kobj.kobject.kset = xfs_kset;
1998 /*
1999 * We don't create the finobt per-ag space reservation until after log
2000 * recovery, so we must set this to true so that an ifree transaction
2001 * started during log recovery will not depend on space reservations
2002 * for finobt expansion.
2003 */
2004 mp->m_finobt_nores = true;
2005
2006 /*
2007 * These can be overridden by the mount option parsing.
2008 */
2009 mp->m_logbufs = -1;
2010 mp->m_logbsize = -1;
2011 mp->m_allocsize_log = 16; /* 64k */
2012
2013 /*
2014 * Copy binary VFS mount flags we are interested in.
2015 */
2016 if (fc->sb_flags & SB_RDONLY)
2017 set_bit(XFS_OPSTATE_READONLY, addr: &mp->m_opstate);
2018 if (fc->sb_flags & SB_DIRSYNC)
2019 mp->m_features |= XFS_FEAT_DIRSYNC;
2020 if (fc->sb_flags & SB_SYNCHRONOUS)
2021 mp->m_features |= XFS_FEAT_WSYNC;
2022
2023 fc->s_fs_info = mp;
2024 fc->ops = &xfs_context_ops;
2025
2026 return 0;
2027}
2028
2029static void
2030xfs_kill_sb(
2031 struct super_block *sb)
2032{
2033 kill_block_super(sb);
2034 xfs_mount_free(XFS_M(sb));
2035}
2036
2037static struct file_system_type xfs_fs_type = {
2038 .owner = THIS_MODULE,
2039 .name = "xfs",
2040 .init_fs_context = xfs_init_fs_context,
2041 .parameters = xfs_fs_parameters,
2042 .kill_sb = xfs_kill_sb,
2043 .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
2044};
2045MODULE_ALIAS_FS("xfs");
2046
2047STATIC int __init
2048xfs_init_caches(void)
2049{
2050 int error;
2051
2052 xfs_buf_cache = kmem_cache_create(name: "xfs_buf", size: sizeof(struct xfs_buf), align: 0,
2053 SLAB_HWCACHE_ALIGN |
2054 SLAB_RECLAIM_ACCOUNT |
2055 SLAB_MEM_SPREAD,
2056 NULL);
2057 if (!xfs_buf_cache)
2058 goto out;
2059
2060 xfs_log_ticket_cache = kmem_cache_create(name: "xfs_log_ticket",
2061 size: sizeof(struct xlog_ticket),
2062 align: 0, flags: 0, NULL);
2063 if (!xfs_log_ticket_cache)
2064 goto out_destroy_buf_cache;
2065
2066 error = xfs_btree_init_cur_caches();
2067 if (error)
2068 goto out_destroy_log_ticket_cache;
2069
2070 error = xfs_defer_init_item_caches();
2071 if (error)
2072 goto out_destroy_btree_cur_cache;
2073
2074 xfs_da_state_cache = kmem_cache_create("xfs_da_state",
2075 sizeof(struct xfs_da_state),
2076 0, 0, NULL);
2077 if (!xfs_da_state_cache)
2078 goto out_destroy_defer_item_cache;
2079
2080 xfs_ifork_cache = kmem_cache_create("xfs_ifork",
2081 sizeof(struct xfs_ifork),
2082 0, 0, NULL);
2083 if (!xfs_ifork_cache)
2084 goto out_destroy_da_state_cache;
2085
2086 xfs_trans_cache = kmem_cache_create(name: "xfs_trans",
2087 size: sizeof(struct xfs_trans),
2088 align: 0, flags: 0, NULL);
2089 if (!xfs_trans_cache)
2090 goto out_destroy_ifork_cache;
2091
2092
2093 /*
2094 * The size of the cache-allocated buf log item is the maximum
2095 * size possible under XFS. This wastes a little bit of memory,
2096 * but it is much faster.
2097 */
2098 xfs_buf_item_cache = kmem_cache_create(name: "xfs_buf_item",
2099 size: sizeof(struct xfs_buf_log_item),
2100 align: 0, flags: 0, NULL);
2101 if (!xfs_buf_item_cache)
2102 goto out_destroy_trans_cache;
2103
2104 xfs_efd_cache = kmem_cache_create(name: "xfs_efd_item",
2105 size: xfs_efd_log_item_sizeof(XFS_EFD_MAX_FAST_EXTENTS),
2106 align: 0, flags: 0, NULL);
2107 if (!xfs_efd_cache)
2108 goto out_destroy_buf_item_cache;
2109
2110 xfs_efi_cache = kmem_cache_create(name: "xfs_efi_item",
2111 size: xfs_efi_log_item_sizeof(XFS_EFI_MAX_FAST_EXTENTS),
2112 align: 0, flags: 0, NULL);
2113 if (!xfs_efi_cache)
2114 goto out_destroy_efd_cache;
2115
2116 xfs_inode_cache = kmem_cache_create(name: "xfs_inode",
2117 size: sizeof(struct xfs_inode), align: 0,
2118 flags: (SLAB_HWCACHE_ALIGN |
2119 SLAB_RECLAIM_ACCOUNT |
2120 SLAB_MEM_SPREAD | SLAB_ACCOUNT),
2121 ctor: xfs_fs_inode_init_once);
2122 if (!xfs_inode_cache)
2123 goto out_destroy_efi_cache;
2124
2125 xfs_ili_cache = kmem_cache_create(name: "xfs_ili",
2126 size: sizeof(struct xfs_inode_log_item), align: 0,
2127 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
2128 NULL);
2129 if (!xfs_ili_cache)
2130 goto out_destroy_inode_cache;
2131
2132 xfs_icreate_cache = kmem_cache_create(name: "xfs_icr",
2133 size: sizeof(struct xfs_icreate_item),
2134 align: 0, flags: 0, NULL);
2135 if (!xfs_icreate_cache)
2136 goto out_destroy_ili_cache;
2137
2138 xfs_rud_cache = kmem_cache_create(name: "xfs_rud_item",
2139 size: sizeof(struct xfs_rud_log_item),
2140 align: 0, flags: 0, NULL);
2141 if (!xfs_rud_cache)
2142 goto out_destroy_icreate_cache;
2143
2144 xfs_rui_cache = kmem_cache_create(name: "xfs_rui_item",
2145 size: xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
2146 align: 0, flags: 0, NULL);
2147 if (!xfs_rui_cache)
2148 goto out_destroy_rud_cache;
2149
2150 xfs_cud_cache = kmem_cache_create(name: "xfs_cud_item",
2151 size: sizeof(struct xfs_cud_log_item),
2152 align: 0, flags: 0, NULL);
2153 if (!xfs_cud_cache)
2154 goto out_destroy_rui_cache;
2155
2156 xfs_cui_cache = kmem_cache_create(name: "xfs_cui_item",
2157 size: xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
2158 align: 0, flags: 0, NULL);
2159 if (!xfs_cui_cache)
2160 goto out_destroy_cud_cache;
2161
2162 xfs_bud_cache = kmem_cache_create(name: "xfs_bud_item",
2163 size: sizeof(struct xfs_bud_log_item),
2164 align: 0, flags: 0, NULL);
2165 if (!xfs_bud_cache)
2166 goto out_destroy_cui_cache;
2167
2168 xfs_bui_cache = kmem_cache_create(name: "xfs_bui_item",
2169 size: xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
2170 align: 0, flags: 0, NULL);
2171 if (!xfs_bui_cache)
2172 goto out_destroy_bud_cache;
2173
2174 xfs_attrd_cache = kmem_cache_create(name: "xfs_attrd_item",
2175 size: sizeof(struct xfs_attrd_log_item),
2176 align: 0, flags: 0, NULL);
2177 if (!xfs_attrd_cache)
2178 goto out_destroy_bui_cache;
2179
2180 xfs_attri_cache = kmem_cache_create(name: "xfs_attri_item",
2181 size: sizeof(struct xfs_attri_log_item),
2182 align: 0, flags: 0, NULL);
2183 if (!xfs_attri_cache)
2184 goto out_destroy_attrd_cache;
2185
2186 xfs_iunlink_cache = kmem_cache_create(name: "xfs_iul_item",
2187 size: sizeof(struct xfs_iunlink_item),
2188 align: 0, flags: 0, NULL);
2189 if (!xfs_iunlink_cache)
2190 goto out_destroy_attri_cache;
2191
2192 return 0;
2193
2194 out_destroy_attri_cache:
2195 kmem_cache_destroy(s: xfs_attri_cache);
2196 out_destroy_attrd_cache:
2197 kmem_cache_destroy(s: xfs_attrd_cache);
2198 out_destroy_bui_cache:
2199 kmem_cache_destroy(s: xfs_bui_cache);
2200 out_destroy_bud_cache:
2201 kmem_cache_destroy(s: xfs_bud_cache);
2202 out_destroy_cui_cache:
2203 kmem_cache_destroy(s: xfs_cui_cache);
2204 out_destroy_cud_cache:
2205 kmem_cache_destroy(s: xfs_cud_cache);
2206 out_destroy_rui_cache:
2207 kmem_cache_destroy(s: xfs_rui_cache);
2208 out_destroy_rud_cache:
2209 kmem_cache_destroy(s: xfs_rud_cache);
2210 out_destroy_icreate_cache:
2211 kmem_cache_destroy(s: xfs_icreate_cache);
2212 out_destroy_ili_cache:
2213 kmem_cache_destroy(s: xfs_ili_cache);
2214 out_destroy_inode_cache:
2215 kmem_cache_destroy(s: xfs_inode_cache);
2216 out_destroy_efi_cache:
2217 kmem_cache_destroy(s: xfs_efi_cache);
2218 out_destroy_efd_cache:
2219 kmem_cache_destroy(s: xfs_efd_cache);
2220 out_destroy_buf_item_cache:
2221 kmem_cache_destroy(s: xfs_buf_item_cache);
2222 out_destroy_trans_cache:
2223 kmem_cache_destroy(s: xfs_trans_cache);
2224 out_destroy_ifork_cache:
2225 kmem_cache_destroy(xfs_ifork_cache);
2226 out_destroy_da_state_cache:
2227 kmem_cache_destroy(xfs_da_state_cache);
2228 out_destroy_defer_item_cache:
2229 xfs_defer_destroy_item_caches();
2230 out_destroy_btree_cur_cache:
2231 xfs_btree_destroy_cur_caches();
2232 out_destroy_log_ticket_cache:
2233 kmem_cache_destroy(s: xfs_log_ticket_cache);
2234 out_destroy_buf_cache:
2235 kmem_cache_destroy(s: xfs_buf_cache);
2236 out:
2237 return -ENOMEM;
2238}
2239
2240STATIC void
2241xfs_destroy_caches(void)
2242{
2243 /*
2244 * Make sure all delayed rcu free are flushed before we
2245 * destroy caches.
2246 */
2247 rcu_barrier();
2248 kmem_cache_destroy(s: xfs_iunlink_cache);
2249 kmem_cache_destroy(s: xfs_attri_cache);
2250 kmem_cache_destroy(s: xfs_attrd_cache);
2251 kmem_cache_destroy(s: xfs_bui_cache);
2252 kmem_cache_destroy(s: xfs_bud_cache);
2253 kmem_cache_destroy(s: xfs_cui_cache);
2254 kmem_cache_destroy(s: xfs_cud_cache);
2255 kmem_cache_destroy(s: xfs_rui_cache);
2256 kmem_cache_destroy(s: xfs_rud_cache);
2257 kmem_cache_destroy(s: xfs_icreate_cache);
2258 kmem_cache_destroy(s: xfs_ili_cache);
2259 kmem_cache_destroy(s: xfs_inode_cache);
2260 kmem_cache_destroy(s: xfs_efi_cache);
2261 kmem_cache_destroy(s: xfs_efd_cache);
2262 kmem_cache_destroy(s: xfs_buf_item_cache);
2263 kmem_cache_destroy(s: xfs_trans_cache);
2264 kmem_cache_destroy(xfs_ifork_cache);
2265 kmem_cache_destroy(xfs_da_state_cache);
2266 xfs_defer_destroy_item_caches();
2267 xfs_btree_destroy_cur_caches();
2268 kmem_cache_destroy(s: xfs_log_ticket_cache);
2269 kmem_cache_destroy(s: xfs_buf_cache);
2270}
2271
2272STATIC int __init
2273xfs_init_workqueues(void)
2274{
2275 /*
2276 * The allocation workqueue can be used in memory reclaim situations
2277 * (writepage path), and parallelism is only limited by the number of
2278 * AGs in all the filesystems mounted. Hence use the default large
2279 * max_active value for this workqueue.
2280 */
2281 xfs_alloc_wq = alloc_workqueue("xfsalloc",
2282 XFS_WQFLAGS(WQ_MEM_RECLAIM | WQ_FREEZABLE), 0);
2283 if (!xfs_alloc_wq)
2284 return -ENOMEM;
2285
2286 xfs_discard_wq = alloc_workqueue(fmt: "xfsdiscard", XFS_WQFLAGS(WQ_UNBOUND),
2287 max_active: 0);
2288 if (!xfs_discard_wq)
2289 goto out_free_alloc_wq;
2290
2291 return 0;
2292out_free_alloc_wq:
2293 destroy_workqueue(xfs_alloc_wq);
2294 return -ENOMEM;
2295}
2296
2297STATIC void
2298xfs_destroy_workqueues(void)
2299{
2300 destroy_workqueue(wq: xfs_discard_wq);
2301 destroy_workqueue(xfs_alloc_wq);
2302}
2303
2304STATIC int __init
2305init_xfs_fs(void)
2306{
2307 int error;
2308
2309 xfs_check_ondisk_structs();
2310
2311 error = xfs_dahash_test();
2312 if (error)
2313 return error;
2314
2315 printk(KERN_INFO XFS_VERSION_STRING " with "
2316 XFS_BUILD_OPTIONS " enabled\n");
2317
2318 xfs_dir_startup();
2319
2320 error = xfs_init_caches();
2321 if (error)
2322 goto out;
2323
2324 error = xfs_init_workqueues();
2325 if (error)
2326 goto out_destroy_caches;
2327
2328 error = xfs_mru_cache_init();
2329 if (error)
2330 goto out_destroy_wq;
2331
2332 error = xfs_init_procfs();
2333 if (error)
2334 goto out_mru_cache_uninit;
2335
2336 error = xfs_sysctl_register();
2337 if (error)
2338 goto out_cleanup_procfs;
2339
2340 xfs_debugfs = xfs_debugfs_mkdir(name: "xfs", NULL);
2341
2342 xfs_kset = kset_create_and_add(name: "xfs", NULL, parent_kobj: fs_kobj);
2343 if (!xfs_kset) {
2344 error = -ENOMEM;
2345 goto out_debugfs_unregister;
2346 }
2347
2348 xfsstats.xs_kobj.kobject.kset = xfs_kset;
2349
2350 xfsstats.xs_stats = alloc_percpu(struct xfsstats);
2351 if (!xfsstats.xs_stats) {
2352 error = -ENOMEM;
2353 goto out_kset_unregister;
2354 }
2355
2356 error = xfs_sysfs_init(kobj: &xfsstats.xs_kobj, ktype: &xfs_stats_ktype, NULL,
2357 name: "stats");
2358 if (error)
2359 goto out_free_stats;
2360
2361 error = xchk_global_stats_setup(parent: xfs_debugfs);
2362 if (error)
2363 goto out_remove_stats_kobj;
2364
2365#ifdef DEBUG
2366 xfs_dbg_kobj.kobject.kset = xfs_kset;
2367 error = xfs_sysfs_init(kobj: &xfs_dbg_kobj, ktype: &xfs_dbg_ktype, NULL, name: "debug");
2368 if (error)
2369 goto out_remove_scrub_stats;
2370#endif
2371
2372 error = xfs_qm_init();
2373 if (error)
2374 goto out_remove_dbg_kobj;
2375
2376 error = register_filesystem(&xfs_fs_type);
2377 if (error)
2378 goto out_qm_exit;
2379 return 0;
2380
2381 out_qm_exit:
2382 xfs_qm_exit();
2383 out_remove_dbg_kobj:
2384#ifdef DEBUG
2385 xfs_sysfs_del(kobj: &xfs_dbg_kobj);
2386 out_remove_scrub_stats:
2387#endif
2388 xchk_global_stats_teardown();
2389 out_remove_stats_kobj:
2390 xfs_sysfs_del(kobj: &xfsstats.xs_kobj);
2391 out_free_stats:
2392 free_percpu(pdata: xfsstats.xs_stats);
2393 out_kset_unregister:
2394 kset_unregister(kset: xfs_kset);
2395 out_debugfs_unregister:
2396 debugfs_remove(dentry: xfs_debugfs);
2397 xfs_sysctl_unregister();
2398 out_cleanup_procfs:
2399 xfs_cleanup_procfs();
2400 out_mru_cache_uninit:
2401 xfs_mru_cache_uninit();
2402 out_destroy_wq:
2403 xfs_destroy_workqueues();
2404 out_destroy_caches:
2405 xfs_destroy_caches();
2406 out:
2407 return error;
2408}
2409
2410STATIC void __exit
2411exit_xfs_fs(void)
2412{
2413 xfs_qm_exit();
2414 unregister_filesystem(&xfs_fs_type);
2415#ifdef DEBUG
2416 xfs_sysfs_del(kobj: &xfs_dbg_kobj);
2417#endif
2418 xchk_global_stats_teardown();
2419 xfs_sysfs_del(kobj: &xfsstats.xs_kobj);
2420 free_percpu(pdata: xfsstats.xs_stats);
2421 kset_unregister(kset: xfs_kset);
2422 debugfs_remove(dentry: xfs_debugfs);
2423 xfs_sysctl_unregister();
2424 xfs_cleanup_procfs();
2425 xfs_mru_cache_uninit();
2426 xfs_destroy_workqueues();
2427 xfs_destroy_caches();
2428 xfs_uuid_table_free();
2429}
2430
2431module_init(init_xfs_fs);
2432module_exit(exit_xfs_fs);
2433
2434MODULE_AUTHOR("Silicon Graphics, Inc.");
2435MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2436MODULE_LICENSE("GPL");
2437

source code of linux/fs/xfs/xfs_super.c