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