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
39 #include <linux/magic.h>
40 #include <linux/fs_context.h>
41 #include <linux/fs_parser.h>
42
43 static const struct super_operations xfs_super_operations;
44
45 static struct kset *xfs_kset; /* top-level xfs sysfs dir */
46 #ifdef DEBUG
47 static struct xfs_kobj xfs_dbg_kobj; /* global debug sysfs attrs */
48 #endif
49
50 enum xfs_dax_mode {
51 XFS_DAX_INODE = 0,
52 XFS_DAX_ALWAYS = 1,
53 XFS_DAX_NEVER = 2,
54 };
55
56 static void
xfs_mount_set_dax_mode(struct xfs_mount * mp,enum xfs_dax_mode mode)57 xfs_mount_set_dax_mode(
58 struct xfs_mount *mp,
59 enum xfs_dax_mode mode)
60 {
61 switch (mode) {
62 case XFS_DAX_INODE:
63 mp->m_flags &= ~(XFS_MOUNT_DAX_ALWAYS | XFS_MOUNT_DAX_NEVER);
64 break;
65 case XFS_DAX_ALWAYS:
66 mp->m_flags |= XFS_MOUNT_DAX_ALWAYS;
67 mp->m_flags &= ~XFS_MOUNT_DAX_NEVER;
68 break;
69 case XFS_DAX_NEVER:
70 mp->m_flags |= XFS_MOUNT_DAX_NEVER;
71 mp->m_flags &= ~XFS_MOUNT_DAX_ALWAYS;
72 break;
73 }
74 }
75
76 static const struct constant_table dax_param_enums[] = {
77 {"inode", XFS_DAX_INODE },
78 {"always", XFS_DAX_ALWAYS },
79 {"never", XFS_DAX_NEVER },
80 {}
81 };
82
83 /*
84 * Table driven mount option parser.
85 */
86 enum {
87 Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev,
88 Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
89 Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
90 Opt_allocsize, Opt_norecovery, Opt_inode64, Opt_inode32, Opt_ikeep,
91 Opt_noikeep, Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2,
92 Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota,
93 Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota,
94 Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
95 Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum,
96 };
97
98 static const struct fs_parameter_spec xfs_fs_parameters[] = {
99 fsparam_u32("logbufs", Opt_logbufs),
100 fsparam_string("logbsize", Opt_logbsize),
101 fsparam_string("logdev", Opt_logdev),
102 fsparam_string("rtdev", Opt_rtdev),
103 fsparam_flag("wsync", Opt_wsync),
104 fsparam_flag("noalign", Opt_noalign),
105 fsparam_flag("swalloc", Opt_swalloc),
106 fsparam_u32("sunit", Opt_sunit),
107 fsparam_u32("swidth", Opt_swidth),
108 fsparam_flag("nouuid", Opt_nouuid),
109 fsparam_flag("grpid", Opt_grpid),
110 fsparam_flag("nogrpid", Opt_nogrpid),
111 fsparam_flag("bsdgroups", Opt_bsdgroups),
112 fsparam_flag("sysvgroups", Opt_sysvgroups),
113 fsparam_string("allocsize", Opt_allocsize),
114 fsparam_flag("norecovery", Opt_norecovery),
115 fsparam_flag("inode64", Opt_inode64),
116 fsparam_flag("inode32", Opt_inode32),
117 fsparam_flag("ikeep", Opt_ikeep),
118 fsparam_flag("noikeep", Opt_noikeep),
119 fsparam_flag("largeio", Opt_largeio),
120 fsparam_flag("nolargeio", Opt_nolargeio),
121 fsparam_flag("attr2", Opt_attr2),
122 fsparam_flag("noattr2", Opt_noattr2),
123 fsparam_flag("filestreams", Opt_filestreams),
124 fsparam_flag("quota", Opt_quota),
125 fsparam_flag("noquota", Opt_noquota),
126 fsparam_flag("usrquota", Opt_usrquota),
127 fsparam_flag("grpquota", Opt_grpquota),
128 fsparam_flag("prjquota", Opt_prjquota),
129 fsparam_flag("uquota", Opt_uquota),
130 fsparam_flag("gquota", Opt_gquota),
131 fsparam_flag("pquota", Opt_pquota),
132 fsparam_flag("uqnoenforce", Opt_uqnoenforce),
133 fsparam_flag("gqnoenforce", Opt_gqnoenforce),
134 fsparam_flag("pqnoenforce", Opt_pqnoenforce),
135 fsparam_flag("qnoenforce", Opt_qnoenforce),
136 fsparam_flag("discard", Opt_discard),
137 fsparam_flag("nodiscard", Opt_nodiscard),
138 fsparam_flag("dax", Opt_dax),
139 fsparam_enum("dax", Opt_dax_enum, dax_param_enums),
140 {}
141 };
142
143 struct proc_xfs_info {
144 uint64_t flag;
145 char *str;
146 };
147
148 static int
xfs_fs_show_options(struct seq_file * m,struct dentry * root)149 xfs_fs_show_options(
150 struct seq_file *m,
151 struct dentry *root)
152 {
153 static struct proc_xfs_info xfs_info_set[] = {
154 /* the few simple ones we can get from the mount struct */
155 { XFS_MOUNT_IKEEP, ",ikeep" },
156 { XFS_MOUNT_WSYNC, ",wsync" },
157 { XFS_MOUNT_NOALIGN, ",noalign" },
158 { XFS_MOUNT_SWALLOC, ",swalloc" },
159 { XFS_MOUNT_NOUUID, ",nouuid" },
160 { XFS_MOUNT_NORECOVERY, ",norecovery" },
161 { XFS_MOUNT_ATTR2, ",attr2" },
162 { XFS_MOUNT_FILESTREAMS, ",filestreams" },
163 { XFS_MOUNT_GRPID, ",grpid" },
164 { XFS_MOUNT_DISCARD, ",discard" },
165 { XFS_MOUNT_LARGEIO, ",largeio" },
166 { XFS_MOUNT_DAX_ALWAYS, ",dax=always" },
167 { XFS_MOUNT_DAX_NEVER, ",dax=never" },
168 { 0, NULL }
169 };
170 struct xfs_mount *mp = XFS_M(root->d_sb);
171 struct proc_xfs_info *xfs_infop;
172
173 for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
174 if (mp->m_flags & xfs_infop->flag)
175 seq_puts(m, xfs_infop->str);
176 }
177
178 seq_printf(m, ",inode%d",
179 (mp->m_flags & XFS_MOUNT_SMALL_INUMS) ? 32 : 64);
180
181 if (mp->m_flags & XFS_MOUNT_ALLOCSIZE)
182 seq_printf(m, ",allocsize=%dk",
183 (1 << mp->m_allocsize_log) >> 10);
184
185 if (mp->m_logbufs > 0)
186 seq_printf(m, ",logbufs=%d", mp->m_logbufs);
187 if (mp->m_logbsize > 0)
188 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
189
190 if (mp->m_logname)
191 seq_show_option(m, "logdev", mp->m_logname);
192 if (mp->m_rtname)
193 seq_show_option(m, "rtdev", mp->m_rtname);
194
195 if (mp->m_dalign > 0)
196 seq_printf(m, ",sunit=%d",
197 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
198 if (mp->m_swidth > 0)
199 seq_printf(m, ",swidth=%d",
200 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
201
202 if (mp->m_qflags & XFS_UQUOTA_ACCT) {
203 if (mp->m_qflags & XFS_UQUOTA_ENFD)
204 seq_puts(m, ",usrquota");
205 else
206 seq_puts(m, ",uqnoenforce");
207 }
208
209 if (mp->m_qflags & XFS_PQUOTA_ACCT) {
210 if (mp->m_qflags & XFS_PQUOTA_ENFD)
211 seq_puts(m, ",prjquota");
212 else
213 seq_puts(m, ",pqnoenforce");
214 }
215 if (mp->m_qflags & XFS_GQUOTA_ACCT) {
216 if (mp->m_qflags & XFS_GQUOTA_ENFD)
217 seq_puts(m, ",grpquota");
218 else
219 seq_puts(m, ",gqnoenforce");
220 }
221
222 if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
223 seq_puts(m, ",noquota");
224
225 return 0;
226 }
227
228 /*
229 * Set parameters for inode allocation heuristics, taking into account
230 * filesystem size and inode32/inode64 mount options; i.e. specifically
231 * whether or not XFS_MOUNT_SMALL_INUMS is set.
232 *
233 * Inode allocation patterns are altered only if inode32 is requested
234 * (XFS_MOUNT_SMALL_INUMS), and the filesystem is sufficiently large.
235 * If altered, XFS_MOUNT_32BITINODES is set as well.
236 *
237 * An agcount independent of that in the mount structure is provided
238 * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
239 * to the potentially higher ag count.
240 *
241 * Returns the maximum AG index which may contain inodes.
242 */
243 xfs_agnumber_t
xfs_set_inode_alloc(struct xfs_mount * mp,xfs_agnumber_t agcount)244 xfs_set_inode_alloc(
245 struct xfs_mount *mp,
246 xfs_agnumber_t agcount)
247 {
248 xfs_agnumber_t index;
249 xfs_agnumber_t maxagi = 0;
250 xfs_sb_t *sbp = &mp->m_sb;
251 xfs_agnumber_t max_metadata;
252 xfs_agino_t agino;
253 xfs_ino_t ino;
254
255 /*
256 * Calculate how much should be reserved for inodes to meet
257 * the max inode percentage. Used only for inode32.
258 */
259 if (M_IGEO(mp)->maxicount) {
260 uint64_t icount;
261
262 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
263 do_div(icount, 100);
264 icount += sbp->sb_agblocks - 1;
265 do_div(icount, sbp->sb_agblocks);
266 max_metadata = icount;
267 } else {
268 max_metadata = agcount;
269 }
270
271 /* Get the last possible inode in the filesystem */
272 agino = XFS_AGB_TO_AGINO(mp, sbp->sb_agblocks - 1);
273 ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
274
275 /*
276 * If user asked for no more than 32-bit inodes, and the fs is
277 * sufficiently large, set XFS_MOUNT_32BITINODES if we must alter
278 * the allocator to accommodate the request.
279 */
280 if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32)
281 mp->m_flags |= XFS_MOUNT_32BITINODES;
282 else
283 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
284
285 for (index = 0; index < agcount; index++) {
286 struct xfs_perag *pag;
287
288 ino = XFS_AGINO_TO_INO(mp, index, agino);
289
290 pag = xfs_perag_get(mp, index);
291
292 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
293 if (ino > XFS_MAXINUMBER_32) {
294 pag->pagi_inodeok = 0;
295 pag->pagf_metadata = 0;
296 } else {
297 pag->pagi_inodeok = 1;
298 maxagi++;
299 if (index < max_metadata)
300 pag->pagf_metadata = 1;
301 else
302 pag->pagf_metadata = 0;
303 }
304 } else {
305 pag->pagi_inodeok = 1;
306 pag->pagf_metadata = 0;
307 }
308
309 xfs_perag_put(pag);
310 }
311
312 return (mp->m_flags & XFS_MOUNT_32BITINODES) ? maxagi : agcount;
313 }
314
315 STATIC int
xfs_blkdev_get(xfs_mount_t * mp,const char * name,struct block_device ** bdevp)316 xfs_blkdev_get(
317 xfs_mount_t *mp,
318 const char *name,
319 struct block_device **bdevp)
320 {
321 int error = 0;
322
323 *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
324 mp);
325 if (IS_ERR(*bdevp)) {
326 error = PTR_ERR(*bdevp);
327 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
328 }
329
330 return error;
331 }
332
333 STATIC void
xfs_blkdev_put(struct block_device * bdev)334 xfs_blkdev_put(
335 struct block_device *bdev)
336 {
337 if (bdev)
338 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
339 }
340
341 void
xfs_blkdev_issue_flush(xfs_buftarg_t * buftarg)342 xfs_blkdev_issue_flush(
343 xfs_buftarg_t *buftarg)
344 {
345 blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS);
346 }
347
348 STATIC void
xfs_close_devices(struct xfs_mount * mp)349 xfs_close_devices(
350 struct xfs_mount *mp)
351 {
352 struct dax_device *dax_ddev = mp->m_ddev_targp->bt_daxdev;
353
354 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
355 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
356 struct dax_device *dax_logdev = mp->m_logdev_targp->bt_daxdev;
357
358 xfs_free_buftarg(mp->m_logdev_targp);
359 xfs_blkdev_put(logdev);
360 fs_put_dax(dax_logdev);
361 }
362 if (mp->m_rtdev_targp) {
363 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
364 struct dax_device *dax_rtdev = mp->m_rtdev_targp->bt_daxdev;
365
366 xfs_free_buftarg(mp->m_rtdev_targp);
367 xfs_blkdev_put(rtdev);
368 fs_put_dax(dax_rtdev);
369 }
370 xfs_free_buftarg(mp->m_ddev_targp);
371 fs_put_dax(dax_ddev);
372 }
373
374 /*
375 * The file system configurations are:
376 * (1) device (partition) with data and internal log
377 * (2) logical volume with data and log subvolumes.
378 * (3) logical volume with data, log, and realtime subvolumes.
379 *
380 * We only have to handle opening the log and realtime volumes here if
381 * they are present. The data subvolume has already been opened by
382 * get_sb_bdev() and is stored in sb->s_bdev.
383 */
384 STATIC int
xfs_open_devices(struct xfs_mount * mp)385 xfs_open_devices(
386 struct xfs_mount *mp)
387 {
388 struct block_device *ddev = mp->m_super->s_bdev;
389 struct dax_device *dax_ddev = fs_dax_get_by_bdev(ddev);
390 struct dax_device *dax_logdev = NULL, *dax_rtdev = NULL;
391 struct block_device *logdev = NULL, *rtdev = NULL;
392 int error;
393
394 /*
395 * Open real time and log devices - order is important.
396 */
397 if (mp->m_logname) {
398 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
399 if (error)
400 goto out;
401 dax_logdev = fs_dax_get_by_bdev(logdev);
402 }
403
404 if (mp->m_rtname) {
405 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
406 if (error)
407 goto out_close_logdev;
408
409 if (rtdev == ddev || rtdev == logdev) {
410 xfs_warn(mp,
411 "Cannot mount filesystem with identical rtdev and ddev/logdev.");
412 error = -EINVAL;
413 goto out_close_rtdev;
414 }
415 dax_rtdev = fs_dax_get_by_bdev(rtdev);
416 }
417
418 /*
419 * Setup xfs_mount buffer target pointers
420 */
421 error = -ENOMEM;
422 mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, dax_ddev);
423 if (!mp->m_ddev_targp)
424 goto out_close_rtdev;
425
426 if (rtdev) {
427 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, dax_rtdev);
428 if (!mp->m_rtdev_targp)
429 goto out_free_ddev_targ;
430 }
431
432 if (logdev && logdev != ddev) {
433 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, dax_logdev);
434 if (!mp->m_logdev_targp)
435 goto out_free_rtdev_targ;
436 } else {
437 mp->m_logdev_targp = mp->m_ddev_targp;
438 }
439
440 return 0;
441
442 out_free_rtdev_targ:
443 if (mp->m_rtdev_targp)
444 xfs_free_buftarg(mp->m_rtdev_targp);
445 out_free_ddev_targ:
446 xfs_free_buftarg(mp->m_ddev_targp);
447 out_close_rtdev:
448 xfs_blkdev_put(rtdev);
449 fs_put_dax(dax_rtdev);
450 out_close_logdev:
451 if (logdev && logdev != ddev) {
452 xfs_blkdev_put(logdev);
453 fs_put_dax(dax_logdev);
454 }
455 out:
456 fs_put_dax(dax_ddev);
457 return error;
458 }
459
460 /*
461 * Setup xfs_mount buffer target pointers based on superblock
462 */
463 STATIC int
xfs_setup_devices(struct xfs_mount * mp)464 xfs_setup_devices(
465 struct xfs_mount *mp)
466 {
467 int error;
468
469 error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
470 if (error)
471 return error;
472
473 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
474 unsigned int log_sector_size = BBSIZE;
475
476 if (xfs_sb_version_hassector(&mp->m_sb))
477 log_sector_size = mp->m_sb.sb_logsectsize;
478 error = xfs_setsize_buftarg(mp->m_logdev_targp,
479 log_sector_size);
480 if (error)
481 return error;
482 }
483 if (mp->m_rtdev_targp) {
484 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
485 mp->m_sb.sb_sectsize);
486 if (error)
487 return error;
488 }
489
490 return 0;
491 }
492
493 STATIC int
xfs_init_mount_workqueues(struct xfs_mount * mp)494 xfs_init_mount_workqueues(
495 struct xfs_mount *mp)
496 {
497 mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
498 WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_super->s_id);
499 if (!mp->m_buf_workqueue)
500 goto out;
501
502 mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
503 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_super->s_id);
504 if (!mp->m_unwritten_workqueue)
505 goto out_destroy_buf;
506
507 mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
508 WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND,
509 0, mp->m_super->s_id);
510 if (!mp->m_cil_workqueue)
511 goto out_destroy_unwritten;
512
513 mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
514 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_super->s_id);
515 if (!mp->m_reclaim_workqueue)
516 goto out_destroy_cil;
517
518 mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
519 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_super->s_id);
520 if (!mp->m_eofblocks_workqueue)
521 goto out_destroy_reclaim;
522
523 mp->m_sync_workqueue = alloc_workqueue("xfs-sync/%s", WQ_FREEZABLE, 0,
524 mp->m_super->s_id);
525 if (!mp->m_sync_workqueue)
526 goto out_destroy_eofb;
527
528 return 0;
529
530 out_destroy_eofb:
531 destroy_workqueue(mp->m_eofblocks_workqueue);
532 out_destroy_reclaim:
533 destroy_workqueue(mp->m_reclaim_workqueue);
534 out_destroy_cil:
535 destroy_workqueue(mp->m_cil_workqueue);
536 out_destroy_unwritten:
537 destroy_workqueue(mp->m_unwritten_workqueue);
538 out_destroy_buf:
539 destroy_workqueue(mp->m_buf_workqueue);
540 out:
541 return -ENOMEM;
542 }
543
544 STATIC void
xfs_destroy_mount_workqueues(struct xfs_mount * mp)545 xfs_destroy_mount_workqueues(
546 struct xfs_mount *mp)
547 {
548 destroy_workqueue(mp->m_sync_workqueue);
549 destroy_workqueue(mp->m_eofblocks_workqueue);
550 destroy_workqueue(mp->m_reclaim_workqueue);
551 destroy_workqueue(mp->m_cil_workqueue);
552 destroy_workqueue(mp->m_unwritten_workqueue);
553 destroy_workqueue(mp->m_buf_workqueue);
554 }
555
556 static void
xfs_flush_inodes_worker(struct work_struct * work)557 xfs_flush_inodes_worker(
558 struct work_struct *work)
559 {
560 struct xfs_mount *mp = container_of(work, struct xfs_mount,
561 m_flush_inodes_work);
562 struct super_block *sb = mp->m_super;
563
564 if (down_read_trylock(&sb->s_umount)) {
565 sync_inodes_sb(sb);
566 up_read(&sb->s_umount);
567 }
568 }
569
570 /*
571 * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
572 * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
573 * for IO to complete so that we effectively throttle multiple callers to the
574 * rate at which IO is completing.
575 */
576 void
xfs_flush_inodes(struct xfs_mount * mp)577 xfs_flush_inodes(
578 struct xfs_mount *mp)
579 {
580 /*
581 * If flush_work() returns true then that means we waited for a flush
582 * which was already in progress. Don't bother running another scan.
583 */
584 if (flush_work(&mp->m_flush_inodes_work))
585 return;
586
587 queue_work(mp->m_sync_workqueue, &mp->m_flush_inodes_work);
588 flush_work(&mp->m_flush_inodes_work);
589 }
590
591 /* Catch misguided souls that try to use this interface on XFS */
592 STATIC struct inode *
xfs_fs_alloc_inode(struct super_block * sb)593 xfs_fs_alloc_inode(
594 struct super_block *sb)
595 {
596 BUG();
597 return NULL;
598 }
599
600 #ifdef DEBUG
601 static void
xfs_check_delalloc(struct xfs_inode * ip,int whichfork)602 xfs_check_delalloc(
603 struct xfs_inode *ip,
604 int whichfork)
605 {
606 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
607 struct xfs_bmbt_irec got;
608 struct xfs_iext_cursor icur;
609
610 if (!ifp || !xfs_iext_lookup_extent(ip, ifp, 0, &icur, &got))
611 return;
612 do {
613 if (isnullstartblock(got.br_startblock)) {
614 xfs_warn(ip->i_mount,
615 "ino %llx %s fork has delalloc extent at [0x%llx:0x%llx]",
616 ip->i_ino,
617 whichfork == XFS_DATA_FORK ? "data" : "cow",
618 got.br_startoff, got.br_blockcount);
619 }
620 } while (xfs_iext_next_extent(ifp, &icur, &got));
621 }
622 #else
623 #define xfs_check_delalloc(ip, whichfork) do { } while (0)
624 #endif
625
626 /*
627 * Now that the generic code is guaranteed not to be accessing
628 * the linux inode, we can inactivate and reclaim the inode.
629 */
630 STATIC void
xfs_fs_destroy_inode(struct inode * inode)631 xfs_fs_destroy_inode(
632 struct inode *inode)
633 {
634 struct xfs_inode *ip = XFS_I(inode);
635
636 trace_xfs_destroy_inode(ip);
637
638 ASSERT(!rwsem_is_locked(&inode->i_rwsem));
639 XFS_STATS_INC(ip->i_mount, vn_rele);
640 XFS_STATS_INC(ip->i_mount, vn_remove);
641
642 xfs_inactive(ip);
643
644 if (!XFS_FORCED_SHUTDOWN(ip->i_mount) && ip->i_delayed_blks) {
645 xfs_check_delalloc(ip, XFS_DATA_FORK);
646 xfs_check_delalloc(ip, XFS_COW_FORK);
647 ASSERT(0);
648 }
649
650 XFS_STATS_INC(ip->i_mount, vn_reclaim);
651
652 /*
653 * We should never get here with one of the reclaim flags already set.
654 */
655 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
656 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
657
658 /*
659 * We always use background reclaim here because even if the inode is
660 * clean, it still may be under IO and hence we have wait for IO
661 * completion to occur before we can reclaim the inode. The background
662 * reclaim path handles this more efficiently than we can here, so
663 * simply let background reclaim tear down all inodes.
664 */
665 xfs_inode_set_reclaim_tag(ip);
666 }
667
668 static void
xfs_fs_dirty_inode(struct inode * inode,int flag)669 xfs_fs_dirty_inode(
670 struct inode *inode,
671 int flag)
672 {
673 struct xfs_inode *ip = XFS_I(inode);
674 struct xfs_mount *mp = ip->i_mount;
675 struct xfs_trans *tp;
676
677 if (!(inode->i_sb->s_flags & SB_LAZYTIME))
678 return;
679 if (flag != I_DIRTY_SYNC || !(inode->i_state & I_DIRTY_TIME))
680 return;
681
682 if (xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp))
683 return;
684 xfs_ilock(ip, XFS_ILOCK_EXCL);
685 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
686 xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
687 xfs_trans_commit(tp);
688 }
689
690 /*
691 * Slab object creation initialisation for the XFS inode.
692 * This covers only the idempotent fields in the XFS inode;
693 * all other fields need to be initialised on allocation
694 * from the slab. This avoids the need to repeatedly initialise
695 * fields in the xfs inode that left in the initialise state
696 * when freeing the inode.
697 */
698 STATIC void
xfs_fs_inode_init_once(void * inode)699 xfs_fs_inode_init_once(
700 void *inode)
701 {
702 struct xfs_inode *ip = inode;
703
704 memset(ip, 0, sizeof(struct xfs_inode));
705
706 /* vfs inode */
707 inode_init_once(VFS_I(ip));
708
709 /* xfs inode */
710 atomic_set(&ip->i_pincount, 0);
711 spin_lock_init(&ip->i_flags_lock);
712
713 mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
714 "xfsino", ip->i_ino);
715 mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
716 "xfsino", ip->i_ino);
717 }
718
719 /*
720 * We do an unlocked check for XFS_IDONTCACHE here because we are already
721 * serialised against cache hits here via the inode->i_lock and igrab() in
722 * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
723 * racing with us, and it avoids needing to grab a spinlock here for every inode
724 * we drop the final reference on.
725 */
726 STATIC int
xfs_fs_drop_inode(struct inode * inode)727 xfs_fs_drop_inode(
728 struct inode *inode)
729 {
730 struct xfs_inode *ip = XFS_I(inode);
731
732 /*
733 * If this unlinked inode is in the middle of recovery, don't
734 * drop the inode just yet; log recovery will take care of
735 * that. See the comment for this inode flag.
736 */
737 if (ip->i_flags & XFS_IRECOVERY) {
738 ASSERT(ip->i_mount->m_log->l_flags & XLOG_RECOVERY_NEEDED);
739 return 0;
740 }
741
742 return generic_drop_inode(inode);
743 }
744
745 static void
xfs_mount_free(struct xfs_mount * mp)746 xfs_mount_free(
747 struct xfs_mount *mp)
748 {
749 kfree(mp->m_rtname);
750 kfree(mp->m_logname);
751 kmem_free(mp);
752 }
753
754 STATIC int
xfs_fs_sync_fs(struct super_block * sb,int wait)755 xfs_fs_sync_fs(
756 struct super_block *sb,
757 int wait)
758 {
759 struct xfs_mount *mp = XFS_M(sb);
760 int error;
761
762 /*
763 * Doing anything during the async pass would be counterproductive.
764 */
765 if (!wait)
766 return 0;
767
768 error = xfs_log_force(mp, XFS_LOG_SYNC);
769 if (error)
770 return error;
771
772 if (laptop_mode) {
773 /*
774 * The disk must be active because we're syncing.
775 * We schedule log work now (now that the disk is
776 * active) instead of later (when it might not be).
777 */
778 flush_delayed_work(&mp->m_log->l_work);
779 }
780
781 return 0;
782 }
783
784 STATIC int
xfs_fs_statfs(struct dentry * dentry,struct kstatfs * statp)785 xfs_fs_statfs(
786 struct dentry *dentry,
787 struct kstatfs *statp)
788 {
789 struct xfs_mount *mp = XFS_M(dentry->d_sb);
790 xfs_sb_t *sbp = &mp->m_sb;
791 struct xfs_inode *ip = XFS_I(d_inode(dentry));
792 uint64_t fakeinos, id;
793 uint64_t icount;
794 uint64_t ifree;
795 uint64_t fdblocks;
796 xfs_extlen_t lsize;
797 int64_t ffree;
798
799 statp->f_type = XFS_SUPER_MAGIC;
800 statp->f_namelen = MAXNAMELEN - 1;
801
802 id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
803 statp->f_fsid = u64_to_fsid(id);
804
805 icount = percpu_counter_sum(&mp->m_icount);
806 ifree = percpu_counter_sum(&mp->m_ifree);
807 fdblocks = percpu_counter_sum(&mp->m_fdblocks);
808
809 spin_lock(&mp->m_sb_lock);
810 statp->f_bsize = sbp->sb_blocksize;
811 lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
812 statp->f_blocks = sbp->sb_dblocks - lsize;
813 spin_unlock(&mp->m_sb_lock);
814
815 /* make sure statp->f_bfree does not underflow */
816 statp->f_bfree = max_t(int64_t, fdblocks - mp->m_alloc_set_aside, 0);
817 statp->f_bavail = statp->f_bfree;
818
819 fakeinos = XFS_FSB_TO_INO(mp, statp->f_bfree);
820 statp->f_files = min(icount + fakeinos, (uint64_t)XFS_MAXINUMBER);
821 if (M_IGEO(mp)->maxicount)
822 statp->f_files = min_t(typeof(statp->f_files),
823 statp->f_files,
824 M_IGEO(mp)->maxicount);
825
826 /* If sb_icount overshot maxicount, report actual allocation */
827 statp->f_files = max_t(typeof(statp->f_files),
828 statp->f_files,
829 sbp->sb_icount);
830
831 /* make sure statp->f_ffree does not underflow */
832 ffree = statp->f_files - (icount - ifree);
833 statp->f_ffree = max_t(int64_t, ffree, 0);
834
835
836 if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
837 ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
838 (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
839 xfs_qm_statvfs(ip, statp);
840
841 if (XFS_IS_REALTIME_MOUNT(mp) &&
842 (ip->i_d.di_flags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME))) {
843 statp->f_blocks = sbp->sb_rblocks;
844 statp->f_bavail = statp->f_bfree =
845 sbp->sb_frextents * sbp->sb_rextsize;
846 }
847
848 return 0;
849 }
850
851 STATIC void
xfs_save_resvblks(struct xfs_mount * mp)852 xfs_save_resvblks(struct xfs_mount *mp)
853 {
854 uint64_t resblks = 0;
855
856 mp->m_resblks_save = mp->m_resblks;
857 xfs_reserve_blocks(mp, &resblks, NULL);
858 }
859
860 STATIC void
xfs_restore_resvblks(struct xfs_mount * mp)861 xfs_restore_resvblks(struct xfs_mount *mp)
862 {
863 uint64_t resblks;
864
865 if (mp->m_resblks_save) {
866 resblks = mp->m_resblks_save;
867 mp->m_resblks_save = 0;
868 } else
869 resblks = xfs_default_resblks(mp);
870
871 xfs_reserve_blocks(mp, &resblks, NULL);
872 }
873
874 /*
875 * Trigger writeback of all the dirty metadata in the file system.
876 *
877 * This ensures that the metadata is written to their location on disk rather
878 * than just existing in transactions in the log. This means after a quiesce
879 * there is no log replay required to write the inodes to disk - this is the
880 * primary difference between a sync and a quiesce.
881 *
882 * We cancel log work early here to ensure all transactions the log worker may
883 * run have finished before we clean up and log the superblock and write an
884 * unmount record. The unfreeze process is responsible for restarting the log
885 * worker correctly.
886 */
887 void
xfs_quiesce_attr(struct xfs_mount * mp)888 xfs_quiesce_attr(
889 struct xfs_mount *mp)
890 {
891 int error = 0;
892
893 cancel_delayed_work_sync(&mp->m_log->l_work);
894
895 /* force the log to unpin objects from the now complete transactions */
896 xfs_log_force(mp, XFS_LOG_SYNC);
897
898
899 /* Push the superblock and write an unmount record */
900 error = xfs_log_sbcount(mp);
901 if (error)
902 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
903 "Frozen image may not be consistent.");
904 xfs_log_quiesce(mp);
905 }
906
907 /*
908 * Second stage of a freeze. The data is already frozen so we only
909 * need to take care of the metadata. Once that's done sync the superblock
910 * to the log to dirty it in case of a crash while frozen. This ensures that we
911 * will recover the unlinked inode lists on the next mount.
912 */
913 STATIC int
xfs_fs_freeze(struct super_block * sb)914 xfs_fs_freeze(
915 struct super_block *sb)
916 {
917 struct xfs_mount *mp = XFS_M(sb);
918 unsigned int flags;
919 int ret;
920
921 /*
922 * The filesystem is now frozen far enough that memory reclaim
923 * cannot safely operate on the filesystem. Hence we need to
924 * set a GFP_NOFS context here to avoid recursion deadlocks.
925 */
926 flags = memalloc_nofs_save();
927 xfs_stop_block_reaping(mp);
928 xfs_save_resvblks(mp);
929 xfs_quiesce_attr(mp);
930 ret = xfs_sync_sb(mp, true);
931 memalloc_nofs_restore(flags);
932 return ret;
933 }
934
935 STATIC int
xfs_fs_unfreeze(struct super_block * sb)936 xfs_fs_unfreeze(
937 struct super_block *sb)
938 {
939 struct xfs_mount *mp = XFS_M(sb);
940
941 xfs_restore_resvblks(mp);
942 xfs_log_work_queue(mp);
943 xfs_start_block_reaping(mp);
944 return 0;
945 }
946
947 /*
948 * This function fills in xfs_mount_t fields based on mount args.
949 * Note: the superblock _has_ now been read in.
950 */
951 STATIC int
xfs_finish_flags(struct xfs_mount * mp)952 xfs_finish_flags(
953 struct xfs_mount *mp)
954 {
955 int ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
956
957 /* Fail a mount where the logbuf is smaller than the log stripe */
958 if (xfs_sb_version_haslogv2(&mp->m_sb)) {
959 if (mp->m_logbsize <= 0 &&
960 mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
961 mp->m_logbsize = mp->m_sb.sb_logsunit;
962 } else if (mp->m_logbsize > 0 &&
963 mp->m_logbsize < mp->m_sb.sb_logsunit) {
964 xfs_warn(mp,
965 "logbuf size must be greater than or equal to log stripe size");
966 return -EINVAL;
967 }
968 } else {
969 /* Fail a mount if the logbuf is larger than 32K */
970 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
971 xfs_warn(mp,
972 "logbuf size for version 1 logs must be 16K or 32K");
973 return -EINVAL;
974 }
975 }
976
977 /*
978 * V5 filesystems always use attr2 format for attributes.
979 */
980 if (xfs_sb_version_hascrc(&mp->m_sb) &&
981 (mp->m_flags & XFS_MOUNT_NOATTR2)) {
982 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
983 "attr2 is always enabled for V5 filesystems.");
984 return -EINVAL;
985 }
986
987 /*
988 * mkfs'ed attr2 will turn on attr2 mount unless explicitly
989 * told by noattr2 to turn it off
990 */
991 if (xfs_sb_version_hasattr2(&mp->m_sb) &&
992 !(mp->m_flags & XFS_MOUNT_NOATTR2))
993 mp->m_flags |= XFS_MOUNT_ATTR2;
994
995 /*
996 * prohibit r/w mounts of read-only filesystems
997 */
998 if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
999 xfs_warn(mp,
1000 "cannot mount a read-only filesystem as read-write");
1001 return -EROFS;
1002 }
1003
1004 if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1005 (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1006 !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1007 xfs_warn(mp,
1008 "Super block does not support project and group quota together");
1009 return -EINVAL;
1010 }
1011
1012 return 0;
1013 }
1014
1015 static int
xfs_init_percpu_counters(struct xfs_mount * mp)1016 xfs_init_percpu_counters(
1017 struct xfs_mount *mp)
1018 {
1019 int error;
1020
1021 error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1022 if (error)
1023 return -ENOMEM;
1024
1025 error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1026 if (error)
1027 goto free_icount;
1028
1029 error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1030 if (error)
1031 goto free_ifree;
1032
1033 error = percpu_counter_init(&mp->m_delalloc_blks, 0, GFP_KERNEL);
1034 if (error)
1035 goto free_fdblocks;
1036
1037 return 0;
1038
1039 free_fdblocks:
1040 percpu_counter_destroy(&mp->m_fdblocks);
1041 free_ifree:
1042 percpu_counter_destroy(&mp->m_ifree);
1043 free_icount:
1044 percpu_counter_destroy(&mp->m_icount);
1045 return -ENOMEM;
1046 }
1047
1048 void
xfs_reinit_percpu_counters(struct xfs_mount * mp)1049 xfs_reinit_percpu_counters(
1050 struct xfs_mount *mp)
1051 {
1052 percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1053 percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1054 percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1055 }
1056
1057 static void
xfs_destroy_percpu_counters(struct xfs_mount * mp)1058 xfs_destroy_percpu_counters(
1059 struct xfs_mount *mp)
1060 {
1061 percpu_counter_destroy(&mp->m_icount);
1062 percpu_counter_destroy(&mp->m_ifree);
1063 percpu_counter_destroy(&mp->m_fdblocks);
1064 ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
1065 percpu_counter_sum(&mp->m_delalloc_blks) == 0);
1066 percpu_counter_destroy(&mp->m_delalloc_blks);
1067 }
1068
1069 static void
xfs_fs_put_super(struct super_block * sb)1070 xfs_fs_put_super(
1071 struct super_block *sb)
1072 {
1073 struct xfs_mount *mp = XFS_M(sb);
1074
1075 /* if ->fill_super failed, we have no mount to tear down */
1076 if (!sb->s_fs_info)
1077 return;
1078
1079 xfs_notice(mp, "Unmounting Filesystem");
1080 xfs_filestream_unmount(mp);
1081 xfs_unmountfs(mp);
1082
1083 xfs_freesb(mp);
1084 free_percpu(mp->m_stats.xs_stats);
1085 xfs_destroy_percpu_counters(mp);
1086 xfs_destroy_mount_workqueues(mp);
1087 xfs_close_devices(mp);
1088
1089 sb->s_fs_info = NULL;
1090 xfs_mount_free(mp);
1091 }
1092
1093 static long
xfs_fs_nr_cached_objects(struct super_block * sb,struct shrink_control * sc)1094 xfs_fs_nr_cached_objects(
1095 struct super_block *sb,
1096 struct shrink_control *sc)
1097 {
1098 /* Paranoia: catch incorrect calls during mount setup or teardown */
1099 if (WARN_ON_ONCE(!sb->s_fs_info))
1100 return 0;
1101 return xfs_reclaim_inodes_count(XFS_M(sb));
1102 }
1103
1104 static long
xfs_fs_free_cached_objects(struct super_block * sb,struct shrink_control * sc)1105 xfs_fs_free_cached_objects(
1106 struct super_block *sb,
1107 struct shrink_control *sc)
1108 {
1109 return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1110 }
1111
1112 static const struct super_operations xfs_super_operations = {
1113 .alloc_inode = xfs_fs_alloc_inode,
1114 .destroy_inode = xfs_fs_destroy_inode,
1115 .dirty_inode = xfs_fs_dirty_inode,
1116 .drop_inode = xfs_fs_drop_inode,
1117 .put_super = xfs_fs_put_super,
1118 .sync_fs = xfs_fs_sync_fs,
1119 .freeze_fs = xfs_fs_freeze,
1120 .unfreeze_fs = xfs_fs_unfreeze,
1121 .statfs = xfs_fs_statfs,
1122 .show_options = xfs_fs_show_options,
1123 .nr_cached_objects = xfs_fs_nr_cached_objects,
1124 .free_cached_objects = xfs_fs_free_cached_objects,
1125 };
1126
1127 static int
suffix_kstrtoint(const char * s,unsigned int base,int * res)1128 suffix_kstrtoint(
1129 const char *s,
1130 unsigned int base,
1131 int *res)
1132 {
1133 int last, shift_left_factor = 0, _res;
1134 char *value;
1135 int ret = 0;
1136
1137 value = kstrdup(s, GFP_KERNEL);
1138 if (!value)
1139 return -ENOMEM;
1140
1141 last = strlen(value) - 1;
1142 if (value[last] == 'K' || value[last] == 'k') {
1143 shift_left_factor = 10;
1144 value[last] = '\0';
1145 }
1146 if (value[last] == 'M' || value[last] == 'm') {
1147 shift_left_factor = 20;
1148 value[last] = '\0';
1149 }
1150 if (value[last] == 'G' || value[last] == 'g') {
1151 shift_left_factor = 30;
1152 value[last] = '\0';
1153 }
1154
1155 if (kstrtoint(value, base, &_res))
1156 ret = -EINVAL;
1157 kfree(value);
1158 *res = _res << shift_left_factor;
1159 return ret;
1160 }
1161
1162 static inline void
xfs_fs_warn_deprecated(struct fs_context * fc,struct fs_parameter * param,uint64_t flag,bool value)1163 xfs_fs_warn_deprecated(
1164 struct fs_context *fc,
1165 struct fs_parameter *param,
1166 uint64_t flag,
1167 bool value)
1168 {
1169 /* Don't print the warning if reconfiguring and current mount point
1170 * already had the flag set
1171 */
1172 if ((fc->purpose & FS_CONTEXT_FOR_RECONFIGURE) &&
1173 !!(XFS_M(fc->root->d_sb)->m_flags & flag) == value)
1174 return;
1175 xfs_warn(fc->s_fs_info, "%s mount option is deprecated.", param->key);
1176 }
1177
1178 /*
1179 * Set mount state from a mount option.
1180 *
1181 * NOTE: mp->m_super is NULL here!
1182 */
1183 static int
xfs_fc_parse_param(struct fs_context * fc,struct fs_parameter * param)1184 xfs_fc_parse_param(
1185 struct fs_context *fc,
1186 struct fs_parameter *param)
1187 {
1188 struct xfs_mount *parsing_mp = fc->s_fs_info;
1189 struct fs_parse_result result;
1190 int size = 0;
1191 int opt;
1192
1193 opt = fs_parse(fc, xfs_fs_parameters, param, &result);
1194 if (opt < 0)
1195 return opt;
1196
1197 switch (opt) {
1198 case Opt_logbufs:
1199 parsing_mp->m_logbufs = result.uint_32;
1200 return 0;
1201 case Opt_logbsize:
1202 if (suffix_kstrtoint(param->string, 10, &parsing_mp->m_logbsize))
1203 return -EINVAL;
1204 return 0;
1205 case Opt_logdev:
1206 kfree(parsing_mp->m_logname);
1207 parsing_mp->m_logname = kstrdup(param->string, GFP_KERNEL);
1208 if (!parsing_mp->m_logname)
1209 return -ENOMEM;
1210 return 0;
1211 case Opt_rtdev:
1212 kfree(parsing_mp->m_rtname);
1213 parsing_mp->m_rtname = kstrdup(param->string, GFP_KERNEL);
1214 if (!parsing_mp->m_rtname)
1215 return -ENOMEM;
1216 return 0;
1217 case Opt_allocsize:
1218 if (suffix_kstrtoint(param->string, 10, &size))
1219 return -EINVAL;
1220 parsing_mp->m_allocsize_log = ffs(size) - 1;
1221 parsing_mp->m_flags |= XFS_MOUNT_ALLOCSIZE;
1222 return 0;
1223 case Opt_grpid:
1224 case Opt_bsdgroups:
1225 parsing_mp->m_flags |= XFS_MOUNT_GRPID;
1226 return 0;
1227 case Opt_nogrpid:
1228 case Opt_sysvgroups:
1229 parsing_mp->m_flags &= ~XFS_MOUNT_GRPID;
1230 return 0;
1231 case Opt_wsync:
1232 parsing_mp->m_flags |= XFS_MOUNT_WSYNC;
1233 return 0;
1234 case Opt_norecovery:
1235 parsing_mp->m_flags |= XFS_MOUNT_NORECOVERY;
1236 return 0;
1237 case Opt_noalign:
1238 parsing_mp->m_flags |= XFS_MOUNT_NOALIGN;
1239 return 0;
1240 case Opt_swalloc:
1241 parsing_mp->m_flags |= XFS_MOUNT_SWALLOC;
1242 return 0;
1243 case Opt_sunit:
1244 parsing_mp->m_dalign = result.uint_32;
1245 return 0;
1246 case Opt_swidth:
1247 parsing_mp->m_swidth = result.uint_32;
1248 return 0;
1249 case Opt_inode32:
1250 parsing_mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1251 return 0;
1252 case Opt_inode64:
1253 parsing_mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1254 return 0;
1255 case Opt_nouuid:
1256 parsing_mp->m_flags |= XFS_MOUNT_NOUUID;
1257 return 0;
1258 case Opt_largeio:
1259 parsing_mp->m_flags |= XFS_MOUNT_LARGEIO;
1260 return 0;
1261 case Opt_nolargeio:
1262 parsing_mp->m_flags &= ~XFS_MOUNT_LARGEIO;
1263 return 0;
1264 case Opt_filestreams:
1265 parsing_mp->m_flags |= XFS_MOUNT_FILESTREAMS;
1266 return 0;
1267 case Opt_noquota:
1268 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
1269 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
1270 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
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_ACTIVE |
1276 XFS_UQUOTA_ENFD);
1277 return 0;
1278 case Opt_qnoenforce:
1279 case Opt_uqnoenforce:
1280 parsing_mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
1281 parsing_mp->m_qflags &= ~XFS_UQUOTA_ENFD;
1282 return 0;
1283 case Opt_pquota:
1284 case Opt_prjquota:
1285 parsing_mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
1286 XFS_PQUOTA_ENFD);
1287 return 0;
1288 case Opt_pqnoenforce:
1289 parsing_mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
1290 parsing_mp->m_qflags &= ~XFS_PQUOTA_ENFD;
1291 return 0;
1292 case Opt_gquota:
1293 case Opt_grpquota:
1294 parsing_mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
1295 XFS_GQUOTA_ENFD);
1296 return 0;
1297 case Opt_gqnoenforce:
1298 parsing_mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
1299 parsing_mp->m_qflags &= ~XFS_GQUOTA_ENFD;
1300 return 0;
1301 case Opt_discard:
1302 parsing_mp->m_flags |= XFS_MOUNT_DISCARD;
1303 return 0;
1304 case Opt_nodiscard:
1305 parsing_mp->m_flags &= ~XFS_MOUNT_DISCARD;
1306 return 0;
1307 #ifdef CONFIG_FS_DAX
1308 case Opt_dax:
1309 xfs_mount_set_dax_mode(parsing_mp, XFS_DAX_ALWAYS);
1310 return 0;
1311 case Opt_dax_enum:
1312 xfs_mount_set_dax_mode(parsing_mp, result.uint_32);
1313 return 0;
1314 #endif
1315 /* Following mount options will be removed in September 2025 */
1316 case Opt_ikeep:
1317 xfs_fs_warn_deprecated(fc, param, XFS_MOUNT_IKEEP, true);
1318 parsing_mp->m_flags |= XFS_MOUNT_IKEEP;
1319 return 0;
1320 case Opt_noikeep:
1321 xfs_fs_warn_deprecated(fc, param, XFS_MOUNT_IKEEP, false);
1322 parsing_mp->m_flags &= ~XFS_MOUNT_IKEEP;
1323 return 0;
1324 case Opt_attr2:
1325 xfs_fs_warn_deprecated(fc, param, XFS_MOUNT_ATTR2, true);
1326 parsing_mp->m_flags |= XFS_MOUNT_ATTR2;
1327 return 0;
1328 case Opt_noattr2:
1329 xfs_fs_warn_deprecated(fc, param, XFS_MOUNT_NOATTR2, true);
1330 parsing_mp->m_flags &= ~XFS_MOUNT_ATTR2;
1331 parsing_mp->m_flags |= XFS_MOUNT_NOATTR2;
1332 return 0;
1333 default:
1334 xfs_warn(parsing_mp, "unknown mount option [%s].", param->key);
1335 return -EINVAL;
1336 }
1337
1338 return 0;
1339 }
1340
1341 static int
xfs_fc_validate_params(struct xfs_mount * mp)1342 xfs_fc_validate_params(
1343 struct xfs_mount *mp)
1344 {
1345 /*
1346 * no recovery flag requires a read-only mount
1347 */
1348 if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
1349 !(mp->m_flags & XFS_MOUNT_RDONLY)) {
1350 xfs_warn(mp, "no-recovery mounts must be read-only.");
1351 return -EINVAL;
1352 }
1353
1354 if ((mp->m_flags & XFS_MOUNT_NOALIGN) &&
1355 (mp->m_dalign || mp->m_swidth)) {
1356 xfs_warn(mp,
1357 "sunit and swidth options incompatible with the noalign option");
1358 return -EINVAL;
1359 }
1360
1361 if (!IS_ENABLED(CONFIG_XFS_QUOTA) && mp->m_qflags != 0) {
1362 xfs_warn(mp, "quota support not available in this kernel.");
1363 return -EINVAL;
1364 }
1365
1366 if ((mp->m_dalign && !mp->m_swidth) ||
1367 (!mp->m_dalign && mp->m_swidth)) {
1368 xfs_warn(mp, "sunit and swidth must be specified together");
1369 return -EINVAL;
1370 }
1371
1372 if (mp->m_dalign && (mp->m_swidth % mp->m_dalign != 0)) {
1373 xfs_warn(mp,
1374 "stripe width (%d) must be a multiple of the stripe unit (%d)",
1375 mp->m_swidth, mp->m_dalign);
1376 return -EINVAL;
1377 }
1378
1379 if (mp->m_logbufs != -1 &&
1380 mp->m_logbufs != 0 &&
1381 (mp->m_logbufs < XLOG_MIN_ICLOGS ||
1382 mp->m_logbufs > XLOG_MAX_ICLOGS)) {
1383 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
1384 mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
1385 return -EINVAL;
1386 }
1387
1388 if (mp->m_logbsize != -1 &&
1389 mp->m_logbsize != 0 &&
1390 (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
1391 mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
1392 !is_power_of_2(mp->m_logbsize))) {
1393 xfs_warn(mp,
1394 "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
1395 mp->m_logbsize);
1396 return -EINVAL;
1397 }
1398
1399 if ((mp->m_flags & XFS_MOUNT_ALLOCSIZE) &&
1400 (mp->m_allocsize_log > XFS_MAX_IO_LOG ||
1401 mp->m_allocsize_log < XFS_MIN_IO_LOG)) {
1402 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
1403 mp->m_allocsize_log, XFS_MIN_IO_LOG, XFS_MAX_IO_LOG);
1404 return -EINVAL;
1405 }
1406
1407 return 0;
1408 }
1409
1410 static int
xfs_fc_fill_super(struct super_block * sb,struct fs_context * fc)1411 xfs_fc_fill_super(
1412 struct super_block *sb,
1413 struct fs_context *fc)
1414 {
1415 struct xfs_mount *mp = sb->s_fs_info;
1416 struct inode *root;
1417 int flags = 0, error;
1418
1419 mp->m_super = sb;
1420
1421 error = xfs_fc_validate_params(mp);
1422 if (error)
1423 goto out_free_names;
1424
1425 sb_min_blocksize(sb, BBSIZE);
1426 sb->s_xattr = xfs_xattr_handlers;
1427 sb->s_export_op = &xfs_export_operations;
1428 #ifdef CONFIG_XFS_QUOTA
1429 sb->s_qcop = &xfs_quotactl_operations;
1430 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1431 #endif
1432 sb->s_op = &xfs_super_operations;
1433
1434 /*
1435 * Delay mount work if the debug hook is set. This is debug
1436 * instrumention to coordinate simulation of xfs mount failures with
1437 * VFS superblock operations
1438 */
1439 if (xfs_globals.mount_delay) {
1440 xfs_notice(mp, "Delaying mount for %d seconds.",
1441 xfs_globals.mount_delay);
1442 msleep(xfs_globals.mount_delay * 1000);
1443 }
1444
1445 if (fc->sb_flags & SB_SILENT)
1446 flags |= XFS_MFSI_QUIET;
1447
1448 error = xfs_open_devices(mp);
1449 if (error)
1450 goto out_free_names;
1451
1452 error = xfs_init_mount_workqueues(mp);
1453 if (error)
1454 goto out_close_devices;
1455
1456 error = xfs_init_percpu_counters(mp);
1457 if (error)
1458 goto out_destroy_workqueues;
1459
1460 /* Allocate stats memory before we do operations that might use it */
1461 mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1462 if (!mp->m_stats.xs_stats) {
1463 error = -ENOMEM;
1464 goto out_destroy_counters;
1465 }
1466
1467 error = xfs_readsb(mp, flags);
1468 if (error)
1469 goto out_free_stats;
1470
1471 error = xfs_finish_flags(mp);
1472 if (error)
1473 goto out_free_sb;
1474
1475 error = xfs_setup_devices(mp);
1476 if (error)
1477 goto out_free_sb;
1478
1479 /* V4 support is undergoing deprecation. */
1480 if (!xfs_sb_version_hascrc(&mp->m_sb)) {
1481 #ifdef CONFIG_XFS_SUPPORT_V4
1482 xfs_warn_once(mp,
1483 "Deprecated V4 format (crc=0) will not be supported after September 2030.");
1484 #else
1485 xfs_warn(mp,
1486 "Deprecated V4 format (crc=0) not supported by kernel.");
1487 error = -EINVAL;
1488 goto out_free_sb;
1489 #endif
1490 }
1491
1492 /*
1493 * XFS block mappings use 54 bits to store the logical block offset.
1494 * This should suffice to handle the maximum file size that the VFS
1495 * supports (currently 2^63 bytes on 64-bit and ULONG_MAX << PAGE_SHIFT
1496 * bytes on 32-bit), but as XFS and VFS have gotten the s_maxbytes
1497 * calculation wrong on 32-bit kernels in the past, we'll add a WARN_ON
1498 * to check this assertion.
1499 *
1500 * Avoid integer overflow by comparing the maximum bmbt offset to the
1501 * maximum pagecache offset in units of fs blocks.
1502 */
1503 if (XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE) > XFS_MAX_FILEOFF) {
1504 xfs_warn(mp,
1505 "MAX_LFS_FILESIZE block offset (%llu) exceeds extent map maximum (%llu)!",
1506 XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE),
1507 XFS_MAX_FILEOFF);
1508 error = -EINVAL;
1509 goto out_free_sb;
1510 }
1511
1512 error = xfs_filestream_mount(mp);
1513 if (error)
1514 goto out_free_sb;
1515
1516 /*
1517 * we must configure the block size in the superblock before we run the
1518 * full mount process as the mount process can lookup and cache inodes.
1519 */
1520 sb->s_magic = XFS_SUPER_MAGIC;
1521 sb->s_blocksize = mp->m_sb.sb_blocksize;
1522 sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1523 sb->s_maxbytes = MAX_LFS_FILESIZE;
1524 sb->s_max_links = XFS_MAXLINK;
1525 sb->s_time_gran = 1;
1526 if (xfs_sb_version_hasbigtime(&mp->m_sb)) {
1527 sb->s_time_min = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MIN);
1528 sb->s_time_max = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MAX);
1529 } else {
1530 sb->s_time_min = XFS_LEGACY_TIME_MIN;
1531 sb->s_time_max = XFS_LEGACY_TIME_MAX;
1532 }
1533 trace_xfs_inode_timestamp_range(mp, sb->s_time_min, sb->s_time_max);
1534 sb->s_iflags |= SB_I_CGROUPWB;
1535
1536 set_posix_acl_flag(sb);
1537
1538 /* version 5 superblocks support inode version counters. */
1539 if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1540 sb->s_flags |= SB_I_VERSION;
1541
1542 if (xfs_sb_version_hasbigtime(&mp->m_sb))
1543 xfs_warn(mp,
1544 "EXPERIMENTAL big timestamp feature in use. Use at your own risk!");
1545
1546 if (mp->m_flags & XFS_MOUNT_DAX_ALWAYS) {
1547 bool rtdev_is_dax = false, datadev_is_dax;
1548
1549 xfs_warn(mp,
1550 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1551
1552 datadev_is_dax = bdev_dax_supported(mp->m_ddev_targp->bt_bdev,
1553 sb->s_blocksize);
1554 if (mp->m_rtdev_targp)
1555 rtdev_is_dax = bdev_dax_supported(
1556 mp->m_rtdev_targp->bt_bdev, sb->s_blocksize);
1557 if (!rtdev_is_dax && !datadev_is_dax) {
1558 xfs_alert(mp,
1559 "DAX unsupported by block device. Turning off DAX.");
1560 xfs_mount_set_dax_mode(mp, XFS_DAX_NEVER);
1561 }
1562 if (xfs_sb_version_hasreflink(&mp->m_sb)) {
1563 xfs_alert(mp,
1564 "DAX and reflink cannot be used together!");
1565 error = -EINVAL;
1566 goto out_filestream_unmount;
1567 }
1568 }
1569
1570 if (mp->m_flags & XFS_MOUNT_DISCARD) {
1571 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1572
1573 if (!blk_queue_discard(q)) {
1574 xfs_warn(mp, "mounting with \"discard\" option, but "
1575 "the device does not support discard");
1576 mp->m_flags &= ~XFS_MOUNT_DISCARD;
1577 }
1578 }
1579
1580 if (xfs_sb_version_hasreflink(&mp->m_sb)) {
1581 if (mp->m_sb.sb_rblocks) {
1582 xfs_alert(mp,
1583 "reflink not compatible with realtime device!");
1584 error = -EINVAL;
1585 goto out_filestream_unmount;
1586 }
1587
1588 if (xfs_globals.always_cow) {
1589 xfs_info(mp, "using DEBUG-only always_cow mode.");
1590 mp->m_always_cow = true;
1591 }
1592 }
1593
1594 if (xfs_sb_version_hasrmapbt(&mp->m_sb) && mp->m_sb.sb_rblocks) {
1595 xfs_alert(mp,
1596 "reverse mapping btree not compatible with realtime device!");
1597 error = -EINVAL;
1598 goto out_filestream_unmount;
1599 }
1600
1601 if (xfs_sb_version_hasinobtcounts(&mp->m_sb))
1602 xfs_warn(mp,
1603 "EXPERIMENTAL inode btree counters feature in use. Use at your own risk!");
1604
1605 error = xfs_mountfs(mp);
1606 if (error)
1607 goto out_filestream_unmount;
1608
1609 root = igrab(VFS_I(mp->m_rootip));
1610 if (!root) {
1611 error = -ENOENT;
1612 goto out_unmount;
1613 }
1614 sb->s_root = d_make_root(root);
1615 if (!sb->s_root) {
1616 error = -ENOMEM;
1617 goto out_unmount;
1618 }
1619
1620 return 0;
1621
1622 out_filestream_unmount:
1623 xfs_filestream_unmount(mp);
1624 out_free_sb:
1625 xfs_freesb(mp);
1626 out_free_stats:
1627 free_percpu(mp->m_stats.xs_stats);
1628 out_destroy_counters:
1629 xfs_destroy_percpu_counters(mp);
1630 out_destroy_workqueues:
1631 xfs_destroy_mount_workqueues(mp);
1632 out_close_devices:
1633 xfs_close_devices(mp);
1634 out_free_names:
1635 sb->s_fs_info = NULL;
1636 xfs_mount_free(mp);
1637 return error;
1638
1639 out_unmount:
1640 xfs_filestream_unmount(mp);
1641 xfs_unmountfs(mp);
1642 goto out_free_sb;
1643 }
1644
1645 static int
xfs_fc_get_tree(struct fs_context * fc)1646 xfs_fc_get_tree(
1647 struct fs_context *fc)
1648 {
1649 return get_tree_bdev(fc, xfs_fc_fill_super);
1650 }
1651
1652 static int
xfs_remount_rw(struct xfs_mount * mp)1653 xfs_remount_rw(
1654 struct xfs_mount *mp)
1655 {
1656 struct xfs_sb *sbp = &mp->m_sb;
1657 int error;
1658
1659 if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1660 xfs_warn(mp,
1661 "ro->rw transition prohibited on norecovery mount");
1662 return -EINVAL;
1663 }
1664
1665 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
1666 xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1667 xfs_warn(mp,
1668 "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1669 (sbp->sb_features_ro_compat &
1670 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1671 return -EINVAL;
1672 }
1673
1674 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1675
1676 /*
1677 * If this is the first remount to writeable state we might have some
1678 * superblock changes to update.
1679 */
1680 if (mp->m_update_sb) {
1681 error = xfs_sync_sb(mp, false);
1682 if (error) {
1683 xfs_warn(mp, "failed to write sb changes");
1684 return error;
1685 }
1686 mp->m_update_sb = false;
1687 }
1688
1689 /*
1690 * Fill out the reserve pool if it is empty. Use the stashed value if
1691 * it is non-zero, otherwise go with the default.
1692 */
1693 xfs_restore_resvblks(mp);
1694 xfs_log_work_queue(mp);
1695
1696 /* Recover any CoW blocks that never got remapped. */
1697 error = xfs_reflink_recover_cow(mp);
1698 if (error) {
1699 xfs_err(mp,
1700 "Error %d recovering leftover CoW allocations.", error);
1701 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1702 return error;
1703 }
1704 xfs_start_block_reaping(mp);
1705
1706 /* Create the per-AG metadata reservation pool .*/
1707 error = xfs_fs_reserve_ag_blocks(mp);
1708 if (error && error != -ENOSPC)
1709 return error;
1710
1711 return 0;
1712 }
1713
1714 static int
xfs_remount_ro(struct xfs_mount * mp)1715 xfs_remount_ro(
1716 struct xfs_mount *mp)
1717 {
1718 struct xfs_eofblocks eofb = {
1719 .eof_flags = XFS_EOF_FLAGS_SYNC,
1720 };
1721 int error;
1722
1723 /* Flush all the dirty data to disk. */
1724 error = sync_filesystem(mp->m_super);
1725 if (error)
1726 return error;
1727
1728 /*
1729 * Cancel background eofb scanning so it cannot race with the final
1730 * log force+buftarg wait and deadlock the remount.
1731 */
1732 xfs_stop_block_reaping(mp);
1733
1734 /*
1735 * Clear out all remaining COW staging extents and speculative post-EOF
1736 * preallocations so that we don't leave inodes requiring inactivation
1737 * cleanups during reclaim on a read-only mount. We must process every
1738 * cached inode, so this requires a synchronous cache scan.
1739 */
1740 error = xfs_icache_free_cowblocks(mp, &eofb);
1741 if (error) {
1742 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1743 return error;
1744 }
1745
1746 /* Free the per-AG metadata reservation pool. */
1747 error = xfs_fs_unreserve_ag_blocks(mp);
1748 if (error) {
1749 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1750 return error;
1751 }
1752
1753 /*
1754 * Before we sync the metadata, we need to free up the reserve block
1755 * pool so that the used block count in the superblock on disk is
1756 * correct at the end of the remount. Stash the current* reserve pool
1757 * size so that if we get remounted rw, we can return it to the same
1758 * size.
1759 */
1760 xfs_save_resvblks(mp);
1761
1762 xfs_quiesce_attr(mp);
1763 mp->m_flags |= XFS_MOUNT_RDONLY;
1764
1765 return 0;
1766 }
1767
1768 /*
1769 * Logically we would return an error here to prevent users from believing
1770 * they might have changed mount options using remount which can't be changed.
1771 *
1772 * But unfortunately mount(8) adds all options from mtab and fstab to the mount
1773 * arguments in some cases so we can't blindly reject options, but have to
1774 * check for each specified option if it actually differs from the currently
1775 * set option and only reject it if that's the case.
1776 *
1777 * Until that is implemented we return success for every remount request, and
1778 * silently ignore all options that we can't actually change.
1779 */
1780 static int
xfs_fc_reconfigure(struct fs_context * fc)1781 xfs_fc_reconfigure(
1782 struct fs_context *fc)
1783 {
1784 struct xfs_mount *mp = XFS_M(fc->root->d_sb);
1785 struct xfs_mount *new_mp = fc->s_fs_info;
1786 xfs_sb_t *sbp = &mp->m_sb;
1787 int flags = fc->sb_flags;
1788 int error;
1789
1790 /* version 5 superblocks always support version counters. */
1791 if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1792 fc->sb_flags |= SB_I_VERSION;
1793
1794 error = xfs_fc_validate_params(new_mp);
1795 if (error)
1796 return error;
1797
1798 /* inode32 -> inode64 */
1799 if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) &&
1800 !(new_mp->m_flags & XFS_MOUNT_SMALL_INUMS)) {
1801 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1802 mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1803 }
1804
1805 /* inode64 -> inode32 */
1806 if (!(mp->m_flags & XFS_MOUNT_SMALL_INUMS) &&
1807 (new_mp->m_flags & XFS_MOUNT_SMALL_INUMS)) {
1808 mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1809 mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1810 }
1811
1812 /* ro -> rw */
1813 if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(flags & SB_RDONLY)) {
1814 error = xfs_remount_rw(mp);
1815 if (error)
1816 return error;
1817 }
1818
1819 /* rw -> ro */
1820 if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (flags & SB_RDONLY)) {
1821 error = xfs_remount_ro(mp);
1822 if (error)
1823 return error;
1824 }
1825
1826 return 0;
1827 }
1828
xfs_fc_free(struct fs_context * fc)1829 static void xfs_fc_free(
1830 struct fs_context *fc)
1831 {
1832 struct xfs_mount *mp = fc->s_fs_info;
1833
1834 /*
1835 * mp is stored in the fs_context when it is initialized.
1836 * mp is transferred to the superblock on a successful mount,
1837 * but if an error occurs before the transfer we have to free
1838 * it here.
1839 */
1840 if (mp)
1841 xfs_mount_free(mp);
1842 }
1843
1844 static const struct fs_context_operations xfs_context_ops = {
1845 .parse_param = xfs_fc_parse_param,
1846 .get_tree = xfs_fc_get_tree,
1847 .reconfigure = xfs_fc_reconfigure,
1848 .free = xfs_fc_free,
1849 };
1850
xfs_init_fs_context(struct fs_context * fc)1851 static int xfs_init_fs_context(
1852 struct fs_context *fc)
1853 {
1854 struct xfs_mount *mp;
1855
1856 mp = kmem_alloc(sizeof(struct xfs_mount), KM_ZERO);
1857 if (!mp)
1858 return -ENOMEM;
1859
1860 spin_lock_init(&mp->m_sb_lock);
1861 spin_lock_init(&mp->m_agirotor_lock);
1862 INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC);
1863 spin_lock_init(&mp->m_perag_lock);
1864 mutex_init(&mp->m_growlock);
1865 INIT_WORK(&mp->m_flush_inodes_work, xfs_flush_inodes_worker);
1866 INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1867 INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1868 INIT_DELAYED_WORK(&mp->m_cowblocks_work, xfs_cowblocks_worker);
1869 mp->m_kobj.kobject.kset = xfs_kset;
1870 /*
1871 * We don't create the finobt per-ag space reservation until after log
1872 * recovery, so we must set this to true so that an ifree transaction
1873 * started during log recovery will not depend on space reservations
1874 * for finobt expansion.
1875 */
1876 mp->m_finobt_nores = true;
1877
1878 /*
1879 * These can be overridden by the mount option parsing.
1880 */
1881 mp->m_logbufs = -1;
1882 mp->m_logbsize = -1;
1883 mp->m_allocsize_log = 16; /* 64k */
1884
1885 /*
1886 * Copy binary VFS mount flags we are interested in.
1887 */
1888 if (fc->sb_flags & SB_RDONLY)
1889 mp->m_flags |= XFS_MOUNT_RDONLY;
1890 if (fc->sb_flags & SB_DIRSYNC)
1891 mp->m_flags |= XFS_MOUNT_DIRSYNC;
1892 if (fc->sb_flags & SB_SYNCHRONOUS)
1893 mp->m_flags |= XFS_MOUNT_WSYNC;
1894
1895 fc->s_fs_info = mp;
1896 fc->ops = &xfs_context_ops;
1897
1898 return 0;
1899 }
1900
1901 static struct file_system_type xfs_fs_type = {
1902 .owner = THIS_MODULE,
1903 .name = "xfs",
1904 .init_fs_context = xfs_init_fs_context,
1905 .parameters = xfs_fs_parameters,
1906 .kill_sb = kill_block_super,
1907 .fs_flags = FS_REQUIRES_DEV,
1908 };
1909 MODULE_ALIAS_FS("xfs");
1910
1911 STATIC int __init
xfs_init_zones(void)1912 xfs_init_zones(void)
1913 {
1914 xfs_log_ticket_zone = kmem_cache_create("xfs_log_ticket",
1915 sizeof(struct xlog_ticket),
1916 0, 0, NULL);
1917 if (!xfs_log_ticket_zone)
1918 goto out;
1919
1920 xfs_bmap_free_item_zone = kmem_cache_create("xfs_bmap_free_item",
1921 sizeof(struct xfs_extent_free_item),
1922 0, 0, NULL);
1923 if (!xfs_bmap_free_item_zone)
1924 goto out_destroy_log_ticket_zone;
1925
1926 xfs_btree_cur_zone = kmem_cache_create("xfs_btree_cur",
1927 sizeof(struct xfs_btree_cur),
1928 0, 0, NULL);
1929 if (!xfs_btree_cur_zone)
1930 goto out_destroy_bmap_free_item_zone;
1931
1932 xfs_da_state_zone = kmem_cache_create("xfs_da_state",
1933 sizeof(struct xfs_da_state),
1934 0, 0, NULL);
1935 if (!xfs_da_state_zone)
1936 goto out_destroy_btree_cur_zone;
1937
1938 xfs_ifork_zone = kmem_cache_create("xfs_ifork",
1939 sizeof(struct xfs_ifork),
1940 0, 0, NULL);
1941 if (!xfs_ifork_zone)
1942 goto out_destroy_da_state_zone;
1943
1944 xfs_trans_zone = kmem_cache_create("xfs_trans",
1945 sizeof(struct xfs_trans),
1946 0, 0, NULL);
1947 if (!xfs_trans_zone)
1948 goto out_destroy_ifork_zone;
1949
1950
1951 /*
1952 * The size of the zone allocated buf log item is the maximum
1953 * size possible under XFS. This wastes a little bit of memory,
1954 * but it is much faster.
1955 */
1956 xfs_buf_item_zone = kmem_cache_create("xfs_buf_item",
1957 sizeof(struct xfs_buf_log_item),
1958 0, 0, NULL);
1959 if (!xfs_buf_item_zone)
1960 goto out_destroy_trans_zone;
1961
1962 xfs_efd_zone = kmem_cache_create("xfs_efd_item",
1963 (sizeof(struct xfs_efd_log_item) +
1964 (XFS_EFD_MAX_FAST_EXTENTS - 1) *
1965 sizeof(struct xfs_extent)),
1966 0, 0, NULL);
1967 if (!xfs_efd_zone)
1968 goto out_destroy_buf_item_zone;
1969
1970 xfs_efi_zone = kmem_cache_create("xfs_efi_item",
1971 (sizeof(struct xfs_efi_log_item) +
1972 (XFS_EFI_MAX_FAST_EXTENTS - 1) *
1973 sizeof(struct xfs_extent)),
1974 0, 0, NULL);
1975 if (!xfs_efi_zone)
1976 goto out_destroy_efd_zone;
1977
1978 xfs_inode_zone = kmem_cache_create("xfs_inode",
1979 sizeof(struct xfs_inode), 0,
1980 (SLAB_HWCACHE_ALIGN |
1981 SLAB_RECLAIM_ACCOUNT |
1982 SLAB_MEM_SPREAD | SLAB_ACCOUNT),
1983 xfs_fs_inode_init_once);
1984 if (!xfs_inode_zone)
1985 goto out_destroy_efi_zone;
1986
1987 xfs_ili_zone = kmem_cache_create("xfs_ili",
1988 sizeof(struct xfs_inode_log_item), 0,
1989 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
1990 NULL);
1991 if (!xfs_ili_zone)
1992 goto out_destroy_inode_zone;
1993
1994 xfs_icreate_zone = kmem_cache_create("xfs_icr",
1995 sizeof(struct xfs_icreate_item),
1996 0, 0, NULL);
1997 if (!xfs_icreate_zone)
1998 goto out_destroy_ili_zone;
1999
2000 xfs_rud_zone = kmem_cache_create("xfs_rud_item",
2001 sizeof(struct xfs_rud_log_item),
2002 0, 0, NULL);
2003 if (!xfs_rud_zone)
2004 goto out_destroy_icreate_zone;
2005
2006 xfs_rui_zone = kmem_cache_create("xfs_rui_item",
2007 xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
2008 0, 0, NULL);
2009 if (!xfs_rui_zone)
2010 goto out_destroy_rud_zone;
2011
2012 xfs_cud_zone = kmem_cache_create("xfs_cud_item",
2013 sizeof(struct xfs_cud_log_item),
2014 0, 0, NULL);
2015 if (!xfs_cud_zone)
2016 goto out_destroy_rui_zone;
2017
2018 xfs_cui_zone = kmem_cache_create("xfs_cui_item",
2019 xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
2020 0, 0, NULL);
2021 if (!xfs_cui_zone)
2022 goto out_destroy_cud_zone;
2023
2024 xfs_bud_zone = kmem_cache_create("xfs_bud_item",
2025 sizeof(struct xfs_bud_log_item),
2026 0, 0, NULL);
2027 if (!xfs_bud_zone)
2028 goto out_destroy_cui_zone;
2029
2030 xfs_bui_zone = kmem_cache_create("xfs_bui_item",
2031 xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
2032 0, 0, NULL);
2033 if (!xfs_bui_zone)
2034 goto out_destroy_bud_zone;
2035
2036 return 0;
2037
2038 out_destroy_bud_zone:
2039 kmem_cache_destroy(xfs_bud_zone);
2040 out_destroy_cui_zone:
2041 kmem_cache_destroy(xfs_cui_zone);
2042 out_destroy_cud_zone:
2043 kmem_cache_destroy(xfs_cud_zone);
2044 out_destroy_rui_zone:
2045 kmem_cache_destroy(xfs_rui_zone);
2046 out_destroy_rud_zone:
2047 kmem_cache_destroy(xfs_rud_zone);
2048 out_destroy_icreate_zone:
2049 kmem_cache_destroy(xfs_icreate_zone);
2050 out_destroy_ili_zone:
2051 kmem_cache_destroy(xfs_ili_zone);
2052 out_destroy_inode_zone:
2053 kmem_cache_destroy(xfs_inode_zone);
2054 out_destroy_efi_zone:
2055 kmem_cache_destroy(xfs_efi_zone);
2056 out_destroy_efd_zone:
2057 kmem_cache_destroy(xfs_efd_zone);
2058 out_destroy_buf_item_zone:
2059 kmem_cache_destroy(xfs_buf_item_zone);
2060 out_destroy_trans_zone:
2061 kmem_cache_destroy(xfs_trans_zone);
2062 out_destroy_ifork_zone:
2063 kmem_cache_destroy(xfs_ifork_zone);
2064 out_destroy_da_state_zone:
2065 kmem_cache_destroy(xfs_da_state_zone);
2066 out_destroy_btree_cur_zone:
2067 kmem_cache_destroy(xfs_btree_cur_zone);
2068 out_destroy_bmap_free_item_zone:
2069 kmem_cache_destroy(xfs_bmap_free_item_zone);
2070 out_destroy_log_ticket_zone:
2071 kmem_cache_destroy(xfs_log_ticket_zone);
2072 out:
2073 return -ENOMEM;
2074 }
2075
2076 STATIC void
xfs_destroy_zones(void)2077 xfs_destroy_zones(void)
2078 {
2079 /*
2080 * Make sure all delayed rcu free are flushed before we
2081 * destroy caches.
2082 */
2083 rcu_barrier();
2084 kmem_cache_destroy(xfs_bui_zone);
2085 kmem_cache_destroy(xfs_bud_zone);
2086 kmem_cache_destroy(xfs_cui_zone);
2087 kmem_cache_destroy(xfs_cud_zone);
2088 kmem_cache_destroy(xfs_rui_zone);
2089 kmem_cache_destroy(xfs_rud_zone);
2090 kmem_cache_destroy(xfs_icreate_zone);
2091 kmem_cache_destroy(xfs_ili_zone);
2092 kmem_cache_destroy(xfs_inode_zone);
2093 kmem_cache_destroy(xfs_efi_zone);
2094 kmem_cache_destroy(xfs_efd_zone);
2095 kmem_cache_destroy(xfs_buf_item_zone);
2096 kmem_cache_destroy(xfs_trans_zone);
2097 kmem_cache_destroy(xfs_ifork_zone);
2098 kmem_cache_destroy(xfs_da_state_zone);
2099 kmem_cache_destroy(xfs_btree_cur_zone);
2100 kmem_cache_destroy(xfs_bmap_free_item_zone);
2101 kmem_cache_destroy(xfs_log_ticket_zone);
2102 }
2103
2104 STATIC int __init
xfs_init_workqueues(void)2105 xfs_init_workqueues(void)
2106 {
2107 /*
2108 * The allocation workqueue can be used in memory reclaim situations
2109 * (writepage path), and parallelism is only limited by the number of
2110 * AGs in all the filesystems mounted. Hence use the default large
2111 * max_active value for this workqueue.
2112 */
2113 xfs_alloc_wq = alloc_workqueue("xfsalloc",
2114 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
2115 if (!xfs_alloc_wq)
2116 return -ENOMEM;
2117
2118 xfs_discard_wq = alloc_workqueue("xfsdiscard", WQ_UNBOUND, 0);
2119 if (!xfs_discard_wq)
2120 goto out_free_alloc_wq;
2121
2122 return 0;
2123 out_free_alloc_wq:
2124 destroy_workqueue(xfs_alloc_wq);
2125 return -ENOMEM;
2126 }
2127
2128 STATIC void
xfs_destroy_workqueues(void)2129 xfs_destroy_workqueues(void)
2130 {
2131 destroy_workqueue(xfs_discard_wq);
2132 destroy_workqueue(xfs_alloc_wq);
2133 }
2134
2135 STATIC int __init
init_xfs_fs(void)2136 init_xfs_fs(void)
2137 {
2138 int error;
2139
2140 xfs_check_ondisk_structs();
2141
2142 printk(KERN_INFO XFS_VERSION_STRING " with "
2143 XFS_BUILD_OPTIONS " enabled\n");
2144
2145 xfs_dir_startup();
2146
2147 error = xfs_init_zones();
2148 if (error)
2149 goto out;
2150
2151 error = xfs_init_workqueues();
2152 if (error)
2153 goto out_destroy_zones;
2154
2155 error = xfs_mru_cache_init();
2156 if (error)
2157 goto out_destroy_wq;
2158
2159 error = xfs_buf_init();
2160 if (error)
2161 goto out_mru_cache_uninit;
2162
2163 error = xfs_init_procfs();
2164 if (error)
2165 goto out_buf_terminate;
2166
2167 error = xfs_sysctl_register();
2168 if (error)
2169 goto out_cleanup_procfs;
2170
2171 xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
2172 if (!xfs_kset) {
2173 error = -ENOMEM;
2174 goto out_sysctl_unregister;
2175 }
2176
2177 xfsstats.xs_kobj.kobject.kset = xfs_kset;
2178
2179 xfsstats.xs_stats = alloc_percpu(struct xfsstats);
2180 if (!xfsstats.xs_stats) {
2181 error = -ENOMEM;
2182 goto out_kset_unregister;
2183 }
2184
2185 error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
2186 "stats");
2187 if (error)
2188 goto out_free_stats;
2189
2190 #ifdef DEBUG
2191 xfs_dbg_kobj.kobject.kset = xfs_kset;
2192 error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
2193 if (error)
2194 goto out_remove_stats_kobj;
2195 #endif
2196
2197 error = xfs_qm_init();
2198 if (error)
2199 goto out_remove_dbg_kobj;
2200
2201 error = register_filesystem(&xfs_fs_type);
2202 if (error)
2203 goto out_qm_exit;
2204 return 0;
2205
2206 out_qm_exit:
2207 xfs_qm_exit();
2208 out_remove_dbg_kobj:
2209 #ifdef DEBUG
2210 xfs_sysfs_del(&xfs_dbg_kobj);
2211 out_remove_stats_kobj:
2212 #endif
2213 xfs_sysfs_del(&xfsstats.xs_kobj);
2214 out_free_stats:
2215 free_percpu(xfsstats.xs_stats);
2216 out_kset_unregister:
2217 kset_unregister(xfs_kset);
2218 out_sysctl_unregister:
2219 xfs_sysctl_unregister();
2220 out_cleanup_procfs:
2221 xfs_cleanup_procfs();
2222 out_buf_terminate:
2223 xfs_buf_terminate();
2224 out_mru_cache_uninit:
2225 xfs_mru_cache_uninit();
2226 out_destroy_wq:
2227 xfs_destroy_workqueues();
2228 out_destroy_zones:
2229 xfs_destroy_zones();
2230 out:
2231 return error;
2232 }
2233
2234 STATIC void __exit
exit_xfs_fs(void)2235 exit_xfs_fs(void)
2236 {
2237 xfs_qm_exit();
2238 unregister_filesystem(&xfs_fs_type);
2239 #ifdef DEBUG
2240 xfs_sysfs_del(&xfs_dbg_kobj);
2241 #endif
2242 xfs_sysfs_del(&xfsstats.xs_kobj);
2243 free_percpu(xfsstats.xs_stats);
2244 kset_unregister(xfs_kset);
2245 xfs_sysctl_unregister();
2246 xfs_cleanup_procfs();
2247 xfs_buf_terminate();
2248 xfs_mru_cache_uninit();
2249 xfs_destroy_workqueues();
2250 xfs_destroy_zones();
2251 xfs_uuid_table_free();
2252 }
2253
2254 module_init(init_xfs_fs);
2255 module_exit(exit_xfs_fs);
2256
2257 MODULE_AUTHOR("Silicon Graphics, Inc.");
2258 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2259 MODULE_LICENSE("GPL");
2260