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

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