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[J-linux.git] / fs / xfs / xfs_super.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
4  * All Rights Reserved.
5  */
6
7 #include "xfs.h"
8 #include "xfs_shared.h"
9 #include "xfs_format.h"
10 #include "xfs_log_format.h"
11 #include "xfs_trans_resv.h"
12 #include "xfs_sb.h"
13 #include "xfs_mount.h"
14 #include "xfs_inode.h"
15 #include "xfs_btree.h"
16 #include "xfs_bmap.h"
17 #include "xfs_alloc.h"
18 #include "xfs_fsops.h"
19 #include "xfs_trans.h"
20 #include "xfs_buf_item.h"
21 #include "xfs_log.h"
22 #include "xfs_log_priv.h"
23 #include "xfs_dir2.h"
24 #include "xfs_extfree_item.h"
25 #include "xfs_mru_cache.h"
26 #include "xfs_inode_item.h"
27 #include "xfs_icache.h"
28 #include "xfs_trace.h"
29 #include "xfs_icreate_item.h"
30 #include "xfs_filestream.h"
31 #include "xfs_quota.h"
32 #include "xfs_sysfs.h"
33 #include "xfs_ondisk.h"
34 #include "xfs_rmap_item.h"
35 #include "xfs_refcount_item.h"
36 #include "xfs_bmap_item.h"
37 #include "xfs_reflink.h"
38 #include "xfs_pwork.h"
39 #include "xfs_ag.h"
40 #include "xfs_defer.h"
41 #include "xfs_attr_item.h"
42 #include "xfs_xattr.h"
43 #include "xfs_iunlink_item.h"
44 #include "xfs_dahash_test.h"
45 #include "xfs_rtbitmap.h"
46 #include "xfs_exchmaps_item.h"
47 #include "xfs_parent.h"
48 #include "xfs_rtalloc.h"
49 #include "scrub/stats.h"
50 #include "scrub/rcbag_btree.h"
51
52 #include <linux/magic.h>
53 #include <linux/fs_context.h>
54 #include <linux/fs_parser.h>
55
56 static const struct super_operations xfs_super_operations;
57
58 static struct dentry *xfs_debugfs;      /* top-level xfs debugfs dir */
59 static struct kset *xfs_kset;           /* top-level xfs sysfs dir */
60 #ifdef DEBUG
61 static struct xfs_kobj xfs_dbg_kobj;    /* global debug sysfs attrs */
62 #endif
63
64 enum xfs_dax_mode {
65         XFS_DAX_INODE = 0,
66         XFS_DAX_ALWAYS = 1,
67         XFS_DAX_NEVER = 2,
68 };
69
70 /* Were quota mount options provided?  Must use the upper 16 bits of qflags. */
71 #define XFS_QFLAGS_MNTOPTS      (1U << 31)
72
73 static void
74 xfs_mount_set_dax_mode(
75         struct xfs_mount        *mp,
76         enum xfs_dax_mode       mode)
77 {
78         switch (mode) {
79         case XFS_DAX_INODE:
80                 mp->m_features &= ~(XFS_FEAT_DAX_ALWAYS | XFS_FEAT_DAX_NEVER);
81                 break;
82         case XFS_DAX_ALWAYS:
83                 mp->m_features |= XFS_FEAT_DAX_ALWAYS;
84                 mp->m_features &= ~XFS_FEAT_DAX_NEVER;
85                 break;
86         case XFS_DAX_NEVER:
87                 mp->m_features |= XFS_FEAT_DAX_NEVER;
88                 mp->m_features &= ~XFS_FEAT_DAX_ALWAYS;
89                 break;
90         }
91 }
92
93 static const struct constant_table dax_param_enums[] = {
94         {"inode",       XFS_DAX_INODE },
95         {"always",      XFS_DAX_ALWAYS },
96         {"never",       XFS_DAX_NEVER },
97         {}
98 };
99
100 /*
101  * Table driven mount option parser.
102  */
103 enum {
104         Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev,
105         Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
106         Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
107         Opt_allocsize, Opt_norecovery, Opt_inode64, Opt_inode32, Opt_ikeep,
108         Opt_noikeep, Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2,
109         Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota,
110         Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota,
111         Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
112         Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum,
113 };
114
115 static const struct fs_parameter_spec xfs_fs_parameters[] = {
116         fsparam_u32("logbufs",          Opt_logbufs),
117         fsparam_string("logbsize",      Opt_logbsize),
118         fsparam_string("logdev",        Opt_logdev),
119         fsparam_string("rtdev",         Opt_rtdev),
120         fsparam_flag("wsync",           Opt_wsync),
121         fsparam_flag("noalign",         Opt_noalign),
122         fsparam_flag("swalloc",         Opt_swalloc),
123         fsparam_u32("sunit",            Opt_sunit),
124         fsparam_u32("swidth",           Opt_swidth),
125         fsparam_flag("nouuid",          Opt_nouuid),
126         fsparam_flag("grpid",           Opt_grpid),
127         fsparam_flag("nogrpid",         Opt_nogrpid),
128         fsparam_flag("bsdgroups",       Opt_bsdgroups),
129         fsparam_flag("sysvgroups",      Opt_sysvgroups),
130         fsparam_string("allocsize",     Opt_allocsize),
131         fsparam_flag("norecovery",      Opt_norecovery),
132         fsparam_flag("inode64",         Opt_inode64),
133         fsparam_flag("inode32",         Opt_inode32),
134         fsparam_flag("ikeep",           Opt_ikeep),
135         fsparam_flag("noikeep",         Opt_noikeep),
136         fsparam_flag("largeio",         Opt_largeio),
137         fsparam_flag("nolargeio",       Opt_nolargeio),
138         fsparam_flag("attr2",           Opt_attr2),
139         fsparam_flag("noattr2",         Opt_noattr2),
140         fsparam_flag("filestreams",     Opt_filestreams),
141         fsparam_flag("quota",           Opt_quota),
142         fsparam_flag("noquota",         Opt_noquota),
143         fsparam_flag("usrquota",        Opt_usrquota),
144         fsparam_flag("grpquota",        Opt_grpquota),
145         fsparam_flag("prjquota",        Opt_prjquota),
146         fsparam_flag("uquota",          Opt_uquota),
147         fsparam_flag("gquota",          Opt_gquota),
148         fsparam_flag("pquota",          Opt_pquota),
149         fsparam_flag("uqnoenforce",     Opt_uqnoenforce),
150         fsparam_flag("gqnoenforce",     Opt_gqnoenforce),
151         fsparam_flag("pqnoenforce",     Opt_pqnoenforce),
152         fsparam_flag("qnoenforce",      Opt_qnoenforce),
153         fsparam_flag("discard",         Opt_discard),
154         fsparam_flag("nodiscard",       Opt_nodiscard),
155         fsparam_flag("dax",             Opt_dax),
156         fsparam_enum("dax",             Opt_dax_enum, dax_param_enums),
157         {}
158 };
159
160 struct proc_xfs_info {
161         uint64_t        flag;
162         char            *str;
163 };
164
165 static int
166 xfs_fs_show_options(
167         struct seq_file         *m,
168         struct dentry           *root)
169 {
170         static struct proc_xfs_info xfs_info_set[] = {
171                 /* the few simple ones we can get from the mount struct */
172                 { XFS_FEAT_IKEEP,               ",ikeep" },
173                 { XFS_FEAT_WSYNC,               ",wsync" },
174                 { XFS_FEAT_NOALIGN,             ",noalign" },
175                 { XFS_FEAT_SWALLOC,             ",swalloc" },
176                 { XFS_FEAT_NOUUID,              ",nouuid" },
177                 { XFS_FEAT_NORECOVERY,          ",norecovery" },
178                 { XFS_FEAT_ATTR2,               ",attr2" },
179                 { XFS_FEAT_FILESTREAMS,         ",filestreams" },
180                 { XFS_FEAT_GRPID,               ",grpid" },
181                 { XFS_FEAT_DISCARD,             ",discard" },
182                 { XFS_FEAT_LARGE_IOSIZE,        ",largeio" },
183                 { XFS_FEAT_DAX_ALWAYS,          ",dax=always" },
184                 { XFS_FEAT_DAX_NEVER,           ",dax=never" },
185                 { 0, NULL }
186         };
187         struct xfs_mount        *mp = XFS_M(root->d_sb);
188         struct proc_xfs_info    *xfs_infop;
189
190         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
191                 if (mp->m_features & xfs_infop->flag)
192                         seq_puts(m, xfs_infop->str);
193         }
194
195         seq_printf(m, ",inode%d", xfs_has_small_inums(mp) ? 32 : 64);
196
197         if (xfs_has_allocsize(mp))
198                 seq_printf(m, ",allocsize=%dk",
199                            (1 << mp->m_allocsize_log) >> 10);
200
201         if (mp->m_logbufs > 0)
202                 seq_printf(m, ",logbufs=%d", mp->m_logbufs);
203         if (mp->m_logbsize > 0)
204                 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
205
206         if (mp->m_logname)
207                 seq_show_option(m, "logdev", mp->m_logname);
208         if (mp->m_rtname)
209                 seq_show_option(m, "rtdev", mp->m_rtname);
210
211         if (mp->m_dalign > 0)
212                 seq_printf(m, ",sunit=%d",
213                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
214         if (mp->m_swidth > 0)
215                 seq_printf(m, ",swidth=%d",
216                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
217
218         if (mp->m_qflags & XFS_UQUOTA_ENFD)
219                 seq_puts(m, ",usrquota");
220         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
221                 seq_puts(m, ",uqnoenforce");
222
223         if (mp->m_qflags & XFS_PQUOTA_ENFD)
224                 seq_puts(m, ",prjquota");
225         else if (mp->m_qflags & XFS_PQUOTA_ACCT)
226                 seq_puts(m, ",pqnoenforce");
227
228         if (mp->m_qflags & XFS_GQUOTA_ENFD)
229                 seq_puts(m, ",grpquota");
230         else if (mp->m_qflags & XFS_GQUOTA_ACCT)
231                 seq_puts(m, ",gqnoenforce");
232
233         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
234                 seq_puts(m, ",noquota");
235
236         return 0;
237 }
238
239 static bool
240 xfs_set_inode_alloc_perag(
241         struct xfs_perag        *pag,
242         xfs_ino_t               ino,
243         xfs_agnumber_t          max_metadata)
244 {
245         if (!xfs_is_inode32(pag_mount(pag))) {
246                 set_bit(XFS_AGSTATE_ALLOWS_INODES, &pag->pag_opstate);
247                 clear_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate);
248                 return false;
249         }
250
251         if (ino > XFS_MAXINUMBER_32) {
252                 clear_bit(XFS_AGSTATE_ALLOWS_INODES, &pag->pag_opstate);
253                 clear_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate);
254                 return false;
255         }
256
257         set_bit(XFS_AGSTATE_ALLOWS_INODES, &pag->pag_opstate);
258         if (pag_agno(pag) < max_metadata)
259                 set_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate);
260         else
261                 clear_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate);
262         return true;
263 }
264
265 /*
266  * Set parameters for inode allocation heuristics, taking into account
267  * filesystem size and inode32/inode64 mount options; i.e. specifically
268  * whether or not XFS_FEAT_SMALL_INUMS is set.
269  *
270  * Inode allocation patterns are altered only if inode32 is requested
271  * (XFS_FEAT_SMALL_INUMS), and the filesystem is sufficiently large.
272  * If altered, XFS_OPSTATE_INODE32 is set as well.
273  *
274  * An agcount independent of that in the mount structure is provided
275  * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
276  * to the potentially higher ag count.
277  *
278  * Returns the maximum AG index which may contain inodes.
279  */
280 xfs_agnumber_t
281 xfs_set_inode_alloc(
282         struct xfs_mount *mp,
283         xfs_agnumber_t  agcount)
284 {
285         xfs_agnumber_t  index;
286         xfs_agnumber_t  maxagi = 0;
287         xfs_sb_t        *sbp = &mp->m_sb;
288         xfs_agnumber_t  max_metadata;
289         xfs_agino_t     agino;
290         xfs_ino_t       ino;
291
292         /*
293          * Calculate how much should be reserved for inodes to meet
294          * the max inode percentage.  Used only for inode32.
295          */
296         if (M_IGEO(mp)->maxicount) {
297                 uint64_t        icount;
298
299                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
300                 do_div(icount, 100);
301                 icount += sbp->sb_agblocks - 1;
302                 do_div(icount, sbp->sb_agblocks);
303                 max_metadata = icount;
304         } else {
305                 max_metadata = agcount;
306         }
307
308         /* Get the last possible inode in the filesystem */
309         agino = XFS_AGB_TO_AGINO(mp, sbp->sb_agblocks - 1);
310         ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
311
312         /*
313          * If user asked for no more than 32-bit inodes, and the fs is
314          * sufficiently large, set XFS_OPSTATE_INODE32 if we must alter
315          * the allocator to accommodate the request.
316          */
317         if (xfs_has_small_inums(mp) && ino > XFS_MAXINUMBER_32)
318                 xfs_set_inode32(mp);
319         else
320                 xfs_clear_inode32(mp);
321
322         for (index = 0; index < agcount; index++) {
323                 struct xfs_perag        *pag;
324
325                 ino = XFS_AGINO_TO_INO(mp, index, agino);
326
327                 pag = xfs_perag_get(mp, index);
328                 if (xfs_set_inode_alloc_perag(pag, ino, max_metadata))
329                         maxagi++;
330                 xfs_perag_put(pag);
331         }
332
333         return xfs_is_inode32(mp) ? maxagi : agcount;
334 }
335
336 static int
337 xfs_setup_dax_always(
338         struct xfs_mount        *mp)
339 {
340         if (!mp->m_ddev_targp->bt_daxdev &&
341             (!mp->m_rtdev_targp || !mp->m_rtdev_targp->bt_daxdev)) {
342                 xfs_alert(mp,
343                         "DAX unsupported by block device. Turning off DAX.");
344                 goto disable_dax;
345         }
346
347         if (mp->m_super->s_blocksize != PAGE_SIZE) {
348                 xfs_alert(mp,
349                         "DAX not supported for blocksize. Turning off DAX.");
350                 goto disable_dax;
351         }
352
353         if (xfs_has_reflink(mp) &&
354             bdev_is_partition(mp->m_ddev_targp->bt_bdev)) {
355                 xfs_alert(mp,
356                         "DAX and reflink cannot work with multi-partitions!");
357                 return -EINVAL;
358         }
359
360         return 0;
361
362 disable_dax:
363         xfs_mount_set_dax_mode(mp, XFS_DAX_NEVER);
364         return 0;
365 }
366
367 STATIC int
368 xfs_blkdev_get(
369         xfs_mount_t             *mp,
370         const char              *name,
371         struct file             **bdev_filep)
372 {
373         int                     error = 0;
374
375         *bdev_filep = bdev_file_open_by_path(name,
376                 BLK_OPEN_READ | BLK_OPEN_WRITE | BLK_OPEN_RESTRICT_WRITES,
377                 mp->m_super, &fs_holder_ops);
378         if (IS_ERR(*bdev_filep)) {
379                 error = PTR_ERR(*bdev_filep);
380                 *bdev_filep = NULL;
381                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
382         }
383
384         return error;
385 }
386
387 STATIC void
388 xfs_shutdown_devices(
389         struct xfs_mount        *mp)
390 {
391         /*
392          * Udev is triggered whenever anyone closes a block device or unmounts
393          * a file systemm on a block device.
394          * The default udev rules invoke blkid to read the fs super and create
395          * symlinks to the bdev under /dev/disk.  For this, it uses buffered
396          * reads through the page cache.
397          *
398          * xfs_db also uses buffered reads to examine metadata.  There is no
399          * coordination between xfs_db and udev, which means that they can run
400          * concurrently.  Note there is no coordination between the kernel and
401          * blkid either.
402          *
403          * On a system with 64k pages, the page cache can cache the superblock
404          * and the root inode (and hence the root directory) with the same 64k
405          * page.  If udev spawns blkid after the mkfs and the system is busy
406          * enough that it is still running when xfs_db starts up, they'll both
407          * read from the same page in the pagecache.
408          *
409          * The unmount writes updated inode metadata to disk directly.  The XFS
410          * buffer cache does not use the bdev pagecache, so it needs to
411          * invalidate that pagecache on unmount.  If the above scenario occurs,
412          * the pagecache no longer reflects what's on disk, xfs_db reads the
413          * stale metadata, and fails to find /a.  Most of the time this succeeds
414          * because closing a bdev invalidates the page cache, but when processes
415          * race, everyone loses.
416          */
417         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
418                 blkdev_issue_flush(mp->m_logdev_targp->bt_bdev);
419                 invalidate_bdev(mp->m_logdev_targp->bt_bdev);
420         }
421         if (mp->m_rtdev_targp) {
422                 blkdev_issue_flush(mp->m_rtdev_targp->bt_bdev);
423                 invalidate_bdev(mp->m_rtdev_targp->bt_bdev);
424         }
425         blkdev_issue_flush(mp->m_ddev_targp->bt_bdev);
426         invalidate_bdev(mp->m_ddev_targp->bt_bdev);
427 }
428
429 /*
430  * The file system configurations are:
431  *      (1) device (partition) with data and internal log
432  *      (2) logical volume with data and log subvolumes.
433  *      (3) logical volume with data, log, and realtime subvolumes.
434  *
435  * We only have to handle opening the log and realtime volumes here if
436  * they are present.  The data subvolume has already been opened by
437  * get_sb_bdev() and is stored in sb->s_bdev.
438  */
439 STATIC int
440 xfs_open_devices(
441         struct xfs_mount        *mp)
442 {
443         struct super_block      *sb = mp->m_super;
444         struct block_device     *ddev = sb->s_bdev;
445         struct file             *logdev_file = NULL, *rtdev_file = NULL;
446         int                     error;
447
448         /*
449          * Open real time and log devices - order is important.
450          */
451         if (mp->m_logname) {
452                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev_file);
453                 if (error)
454                         return error;
455         }
456
457         if (mp->m_rtname) {
458                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev_file);
459                 if (error)
460                         goto out_close_logdev;
461
462                 if (file_bdev(rtdev_file) == ddev ||
463                     (logdev_file &&
464                      file_bdev(rtdev_file) == file_bdev(logdev_file))) {
465                         xfs_warn(mp,
466         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
467                         error = -EINVAL;
468                         goto out_close_rtdev;
469                 }
470         }
471
472         /*
473          * Setup xfs_mount buffer target pointers
474          */
475         error = -ENOMEM;
476         mp->m_ddev_targp = xfs_alloc_buftarg(mp, sb->s_bdev_file);
477         if (!mp->m_ddev_targp)
478                 goto out_close_rtdev;
479
480         if (rtdev_file) {
481                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev_file);
482                 if (!mp->m_rtdev_targp)
483                         goto out_free_ddev_targ;
484         }
485
486         if (logdev_file && file_bdev(logdev_file) != ddev) {
487                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev_file);
488                 if (!mp->m_logdev_targp)
489                         goto out_free_rtdev_targ;
490         } else {
491                 mp->m_logdev_targp = mp->m_ddev_targp;
492                 /* Handle won't be used, drop it */
493                 if (logdev_file)
494                         bdev_fput(logdev_file);
495         }
496
497         return 0;
498
499  out_free_rtdev_targ:
500         if (mp->m_rtdev_targp)
501                 xfs_free_buftarg(mp->m_rtdev_targp);
502  out_free_ddev_targ:
503         xfs_free_buftarg(mp->m_ddev_targp);
504  out_close_rtdev:
505          if (rtdev_file)
506                 bdev_fput(rtdev_file);
507  out_close_logdev:
508         if (logdev_file)
509                 bdev_fput(logdev_file);
510         return error;
511 }
512
513 /*
514  * Setup xfs_mount buffer target pointers based on superblock
515  */
516 STATIC int
517 xfs_setup_devices(
518         struct xfs_mount        *mp)
519 {
520         int                     error;
521
522         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
523         if (error)
524                 return error;
525
526         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
527                 unsigned int    log_sector_size = BBSIZE;
528
529                 if (xfs_has_sector(mp))
530                         log_sector_size = mp->m_sb.sb_logsectsize;
531                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
532                                             log_sector_size);
533                 if (error)
534                         return error;
535         }
536         if (mp->m_rtdev_targp) {
537                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
538                                             mp->m_sb.sb_sectsize);
539                 if (error)
540                         return error;
541         }
542
543         return 0;
544 }
545
546 STATIC int
547 xfs_init_mount_workqueues(
548         struct xfs_mount        *mp)
549 {
550         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
551                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
552                         1, mp->m_super->s_id);
553         if (!mp->m_buf_workqueue)
554                 goto out;
555
556         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
557                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
558                         0, mp->m_super->s_id);
559         if (!mp->m_unwritten_workqueue)
560                 goto out_destroy_buf;
561
562         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
563                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
564                         0, mp->m_super->s_id);
565         if (!mp->m_reclaim_workqueue)
566                 goto out_destroy_unwritten;
567
568         mp->m_blockgc_wq = alloc_workqueue("xfs-blockgc/%s",
569                         XFS_WQFLAGS(WQ_UNBOUND | WQ_FREEZABLE | WQ_MEM_RECLAIM),
570                         0, mp->m_super->s_id);
571         if (!mp->m_blockgc_wq)
572                 goto out_destroy_reclaim;
573
574         mp->m_inodegc_wq = alloc_workqueue("xfs-inodegc/%s",
575                         XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
576                         1, mp->m_super->s_id);
577         if (!mp->m_inodegc_wq)
578                 goto out_destroy_blockgc;
579
580         mp->m_sync_workqueue = alloc_workqueue("xfs-sync/%s",
581                         XFS_WQFLAGS(WQ_FREEZABLE), 0, mp->m_super->s_id);
582         if (!mp->m_sync_workqueue)
583                 goto out_destroy_inodegc;
584
585         return 0;
586
587 out_destroy_inodegc:
588         destroy_workqueue(mp->m_inodegc_wq);
589 out_destroy_blockgc:
590         destroy_workqueue(mp->m_blockgc_wq);
591 out_destroy_reclaim:
592         destroy_workqueue(mp->m_reclaim_workqueue);
593 out_destroy_unwritten:
594         destroy_workqueue(mp->m_unwritten_workqueue);
595 out_destroy_buf:
596         destroy_workqueue(mp->m_buf_workqueue);
597 out:
598         return -ENOMEM;
599 }
600
601 STATIC void
602 xfs_destroy_mount_workqueues(
603         struct xfs_mount        *mp)
604 {
605         destroy_workqueue(mp->m_sync_workqueue);
606         destroy_workqueue(mp->m_blockgc_wq);
607         destroy_workqueue(mp->m_inodegc_wq);
608         destroy_workqueue(mp->m_reclaim_workqueue);
609         destroy_workqueue(mp->m_unwritten_workqueue);
610         destroy_workqueue(mp->m_buf_workqueue);
611 }
612
613 static void
614 xfs_flush_inodes_worker(
615         struct work_struct      *work)
616 {
617         struct xfs_mount        *mp = container_of(work, struct xfs_mount,
618                                                    m_flush_inodes_work);
619         struct super_block      *sb = mp->m_super;
620
621         if (down_read_trylock(&sb->s_umount)) {
622                 sync_inodes_sb(sb);
623                 up_read(&sb->s_umount);
624         }
625 }
626
627 /*
628  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
629  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
630  * for IO to complete so that we effectively throttle multiple callers to the
631  * rate at which IO is completing.
632  */
633 void
634 xfs_flush_inodes(
635         struct xfs_mount        *mp)
636 {
637         /*
638          * If flush_work() returns true then that means we waited for a flush
639          * which was already in progress.  Don't bother running another scan.
640          */
641         if (flush_work(&mp->m_flush_inodes_work))
642                 return;
643
644         queue_work(mp->m_sync_workqueue, &mp->m_flush_inodes_work);
645         flush_work(&mp->m_flush_inodes_work);
646 }
647
648 /* Catch misguided souls that try to use this interface on XFS */
649 STATIC struct inode *
650 xfs_fs_alloc_inode(
651         struct super_block      *sb)
652 {
653         BUG();
654         return NULL;
655 }
656
657 /*
658  * Now that the generic code is guaranteed not to be accessing
659  * the linux inode, we can inactivate and reclaim the inode.
660  */
661 STATIC void
662 xfs_fs_destroy_inode(
663         struct inode            *inode)
664 {
665         struct xfs_inode        *ip = XFS_I(inode);
666
667         trace_xfs_destroy_inode(ip);
668
669         ASSERT(!rwsem_is_locked(&inode->i_rwsem));
670         XFS_STATS_INC(ip->i_mount, vn_rele);
671         XFS_STATS_INC(ip->i_mount, vn_remove);
672         xfs_inode_mark_reclaimable(ip);
673 }
674
675 static void
676 xfs_fs_dirty_inode(
677         struct inode                    *inode,
678         int                             flags)
679 {
680         struct xfs_inode                *ip = XFS_I(inode);
681         struct xfs_mount                *mp = ip->i_mount;
682         struct xfs_trans                *tp;
683
684         if (!(inode->i_sb->s_flags & SB_LAZYTIME))
685                 return;
686
687         /*
688          * Only do the timestamp update if the inode is dirty (I_DIRTY_SYNC)
689          * and has dirty timestamp (I_DIRTY_TIME). I_DIRTY_TIME can be passed
690          * in flags possibly together with I_DIRTY_SYNC.
691          */
692         if ((flags & ~I_DIRTY_TIME) != I_DIRTY_SYNC || !(flags & I_DIRTY_TIME))
693                 return;
694
695         if (xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp))
696                 return;
697         xfs_ilock(ip, XFS_ILOCK_EXCL);
698         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
699         xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
700         xfs_trans_commit(tp);
701 }
702
703 /*
704  * Slab object creation initialisation for the XFS inode.
705  * This covers only the idempotent fields in the XFS inode;
706  * all other fields need to be initialised on allocation
707  * from the slab. This avoids the need to repeatedly initialise
708  * fields in the xfs inode that left in the initialise state
709  * when freeing the inode.
710  */
711 STATIC void
712 xfs_fs_inode_init_once(
713         void                    *inode)
714 {
715         struct xfs_inode        *ip = inode;
716
717         memset(ip, 0, sizeof(struct xfs_inode));
718
719         /* vfs inode */
720         inode_init_once(VFS_I(ip));
721
722         /* xfs inode */
723         atomic_set(&ip->i_pincount, 0);
724         spin_lock_init(&ip->i_flags_lock);
725         init_rwsem(&ip->i_lock);
726 }
727
728 /*
729  * We do an unlocked check for XFS_IDONTCACHE here because we are already
730  * serialised against cache hits here via the inode->i_lock and igrab() in
731  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
732  * racing with us, and it avoids needing to grab a spinlock here for every inode
733  * we drop the final reference on.
734  */
735 STATIC int
736 xfs_fs_drop_inode(
737         struct inode            *inode)
738 {
739         struct xfs_inode        *ip = XFS_I(inode);
740
741         /*
742          * If this unlinked inode is in the middle of recovery, don't
743          * drop the inode just yet; log recovery will take care of
744          * that.  See the comment for this inode flag.
745          */
746         if (ip->i_flags & XFS_IRECOVERY) {
747                 ASSERT(xlog_recovery_needed(ip->i_mount->m_log));
748                 return 0;
749         }
750
751         return generic_drop_inode(inode);
752 }
753
754 static void
755 xfs_mount_free(
756         struct xfs_mount        *mp)
757 {
758         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp)
759                 xfs_free_buftarg(mp->m_logdev_targp);
760         if (mp->m_rtdev_targp)
761                 xfs_free_buftarg(mp->m_rtdev_targp);
762         if (mp->m_ddev_targp)
763                 xfs_free_buftarg(mp->m_ddev_targp);
764
765         debugfs_remove(mp->m_debugfs);
766         kfree(mp->m_rtname);
767         kfree(mp->m_logname);
768         kfree(mp);
769 }
770
771 STATIC int
772 xfs_fs_sync_fs(
773         struct super_block      *sb,
774         int                     wait)
775 {
776         struct xfs_mount        *mp = XFS_M(sb);
777         int                     error;
778
779         trace_xfs_fs_sync_fs(mp, __return_address);
780
781         /*
782          * Doing anything during the async pass would be counterproductive.
783          */
784         if (!wait)
785                 return 0;
786
787         error = xfs_log_force(mp, XFS_LOG_SYNC);
788         if (error)
789                 return error;
790
791         if (laptop_mode) {
792                 /*
793                  * The disk must be active because we're syncing.
794                  * We schedule log work now (now that the disk is
795                  * active) instead of later (when it might not be).
796                  */
797                 flush_delayed_work(&mp->m_log->l_work);
798         }
799
800         /*
801          * If we are called with page faults frozen out, it means we are about
802          * to freeze the transaction subsystem. Take the opportunity to shut
803          * down inodegc because once SB_FREEZE_FS is set it's too late to
804          * prevent inactivation races with freeze. The fs doesn't get called
805          * again by the freezing process until after SB_FREEZE_FS has been set,
806          * so it's now or never.  Same logic applies to speculative allocation
807          * garbage collection.
808          *
809          * We don't care if this is a normal syncfs call that does this or
810          * freeze that does this - we can run this multiple times without issue
811          * and we won't race with a restart because a restart can only occur
812          * when the state is either SB_FREEZE_FS or SB_FREEZE_COMPLETE.
813          */
814         if (sb->s_writers.frozen == SB_FREEZE_PAGEFAULT) {
815                 xfs_inodegc_stop(mp);
816                 xfs_blockgc_stop(mp);
817         }
818
819         return 0;
820 }
821
822 STATIC int
823 xfs_fs_statfs(
824         struct dentry           *dentry,
825         struct kstatfs          *statp)
826 {
827         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
828         xfs_sb_t                *sbp = &mp->m_sb;
829         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
830         uint64_t                fakeinos, id;
831         uint64_t                icount;
832         uint64_t                ifree;
833         uint64_t                fdblocks;
834         xfs_extlen_t            lsize;
835         int64_t                 ffree;
836
837         /*
838          * Expedite background inodegc but don't wait. We do not want to block
839          * here waiting hours for a billion extent file to be truncated.
840          */
841         xfs_inodegc_push(mp);
842
843         statp->f_type = XFS_SUPER_MAGIC;
844         statp->f_namelen = MAXNAMELEN - 1;
845
846         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
847         statp->f_fsid = u64_to_fsid(id);
848
849         icount = percpu_counter_sum(&mp->m_icount);
850         ifree = percpu_counter_sum(&mp->m_ifree);
851         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
852
853         spin_lock(&mp->m_sb_lock);
854         statp->f_bsize = sbp->sb_blocksize;
855         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
856         statp->f_blocks = sbp->sb_dblocks - lsize;
857         spin_unlock(&mp->m_sb_lock);
858
859         /* make sure statp->f_bfree does not underflow */
860         statp->f_bfree = max_t(int64_t, 0,
861                                 fdblocks - xfs_fdblocks_unavailable(mp));
862         statp->f_bavail = statp->f_bfree;
863
864         fakeinos = XFS_FSB_TO_INO(mp, statp->f_bfree);
865         statp->f_files = min(icount + fakeinos, (uint64_t)XFS_MAXINUMBER);
866         if (M_IGEO(mp)->maxicount)
867                 statp->f_files = min_t(typeof(statp->f_files),
868                                         statp->f_files,
869                                         M_IGEO(mp)->maxicount);
870
871         /* If sb_icount overshot maxicount, report actual allocation */
872         statp->f_files = max_t(typeof(statp->f_files),
873                                         statp->f_files,
874                                         sbp->sb_icount);
875
876         /* make sure statp->f_ffree does not underflow */
877         ffree = statp->f_files - (icount - ifree);
878         statp->f_ffree = max_t(int64_t, ffree, 0);
879
880         if (XFS_IS_REALTIME_MOUNT(mp) &&
881             (ip->i_diflags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME))) {
882                 s64     freertx;
883
884                 statp->f_blocks = sbp->sb_rblocks;
885                 freertx = percpu_counter_sum_positive(&mp->m_frextents);
886                 statp->f_bavail = statp->f_bfree =
887                         xfs_rtbxlen_to_blen(mp, freertx);
888         }
889
890         if ((ip->i_diflags & XFS_DIFLAG_PROJINHERIT) &&
891             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
892                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
893                 xfs_qm_statvfs(ip, statp);
894
895         return 0;
896 }
897
898 STATIC void
899 xfs_save_resvblks(struct xfs_mount *mp)
900 {
901         mp->m_resblks_save = mp->m_resblks;
902         xfs_reserve_blocks(mp, 0);
903 }
904
905 STATIC void
906 xfs_restore_resvblks(struct xfs_mount *mp)
907 {
908         uint64_t resblks;
909
910         if (mp->m_resblks_save) {
911                 resblks = mp->m_resblks_save;
912                 mp->m_resblks_save = 0;
913         } else
914                 resblks = xfs_default_resblks(mp);
915
916         xfs_reserve_blocks(mp, resblks);
917 }
918
919 /*
920  * Second stage of a freeze. The data is already frozen so we only
921  * need to take care of the metadata. Once that's done sync the superblock
922  * to the log to dirty it in case of a crash while frozen. This ensures that we
923  * will recover the unlinked inode lists on the next mount.
924  */
925 STATIC int
926 xfs_fs_freeze(
927         struct super_block      *sb)
928 {
929         struct xfs_mount        *mp = XFS_M(sb);
930         unsigned int            flags;
931         int                     ret;
932
933         /*
934          * The filesystem is now frozen far enough that memory reclaim
935          * cannot safely operate on the filesystem. Hence we need to
936          * set a GFP_NOFS context here to avoid recursion deadlocks.
937          */
938         flags = memalloc_nofs_save();
939         xfs_save_resvblks(mp);
940         ret = xfs_log_quiesce(mp);
941         memalloc_nofs_restore(flags);
942
943         /*
944          * For read-write filesystems, we need to restart the inodegc on error
945          * because we stopped it at SB_FREEZE_PAGEFAULT level and a thaw is not
946          * going to be run to restart it now.  We are at SB_FREEZE_FS level
947          * here, so we can restart safely without racing with a stop in
948          * xfs_fs_sync_fs().
949          */
950         if (ret && !xfs_is_readonly(mp)) {
951                 xfs_blockgc_start(mp);
952                 xfs_inodegc_start(mp);
953         }
954
955         return ret;
956 }
957
958 STATIC int
959 xfs_fs_unfreeze(
960         struct super_block      *sb)
961 {
962         struct xfs_mount        *mp = XFS_M(sb);
963
964         xfs_restore_resvblks(mp);
965         xfs_log_work_queue(mp);
966
967         /*
968          * Don't reactivate the inodegc worker on a readonly filesystem because
969          * inodes are sent directly to reclaim.  Don't reactivate the blockgc
970          * worker because there are no speculative preallocations on a readonly
971          * filesystem.
972          */
973         if (!xfs_is_readonly(mp)) {
974                 xfs_blockgc_start(mp);
975                 xfs_inodegc_start(mp);
976         }
977
978         return 0;
979 }
980
981 /*
982  * This function fills in xfs_mount_t fields based on mount args.
983  * Note: the superblock _has_ now been read in.
984  */
985 STATIC int
986 xfs_finish_flags(
987         struct xfs_mount        *mp)
988 {
989         /* Fail a mount where the logbuf is smaller than the log stripe */
990         if (xfs_has_logv2(mp)) {
991                 if (mp->m_logbsize <= 0 &&
992                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
993                         mp->m_logbsize = mp->m_sb.sb_logsunit;
994                 } else if (mp->m_logbsize > 0 &&
995                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
996                         xfs_warn(mp,
997                 "logbuf size must be greater than or equal to log stripe size");
998                         return -EINVAL;
999                 }
1000         } else {
1001                 /* Fail a mount if the logbuf is larger than 32K */
1002                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1003                         xfs_warn(mp,
1004                 "logbuf size for version 1 logs must be 16K or 32K");
1005                         return -EINVAL;
1006                 }
1007         }
1008
1009         /*
1010          * V5 filesystems always use attr2 format for attributes.
1011          */
1012         if (xfs_has_crc(mp) && xfs_has_noattr2(mp)) {
1013                 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
1014                              "attr2 is always enabled for V5 filesystems.");
1015                 return -EINVAL;
1016         }
1017
1018         /*
1019          * prohibit r/w mounts of read-only filesystems
1020          */
1021         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !xfs_is_readonly(mp)) {
1022                 xfs_warn(mp,
1023                         "cannot mount a read-only filesystem as read-write");
1024                 return -EROFS;
1025         }
1026
1027         if ((mp->m_qflags & XFS_GQUOTA_ACCT) &&
1028             (mp->m_qflags & XFS_PQUOTA_ACCT) &&
1029             !xfs_has_pquotino(mp)) {
1030                 xfs_warn(mp,
1031                   "Super block does not support project and group quota together");
1032                 return -EINVAL;
1033         }
1034
1035         return 0;
1036 }
1037
1038 static int
1039 xfs_init_percpu_counters(
1040         struct xfs_mount        *mp)
1041 {
1042         int             error;
1043
1044         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1045         if (error)
1046                 return -ENOMEM;
1047
1048         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1049         if (error)
1050                 goto free_icount;
1051
1052         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1053         if (error)
1054                 goto free_ifree;
1055
1056         error = percpu_counter_init(&mp->m_delalloc_blks, 0, GFP_KERNEL);
1057         if (error)
1058                 goto free_fdblocks;
1059
1060         error = percpu_counter_init(&mp->m_delalloc_rtextents, 0, GFP_KERNEL);
1061         if (error)
1062                 goto free_delalloc;
1063
1064         error = percpu_counter_init(&mp->m_frextents, 0, GFP_KERNEL);
1065         if (error)
1066                 goto free_delalloc_rt;
1067
1068         return 0;
1069
1070 free_delalloc_rt:
1071         percpu_counter_destroy(&mp->m_delalloc_rtextents);
1072 free_delalloc:
1073         percpu_counter_destroy(&mp->m_delalloc_blks);
1074 free_fdblocks:
1075         percpu_counter_destroy(&mp->m_fdblocks);
1076 free_ifree:
1077         percpu_counter_destroy(&mp->m_ifree);
1078 free_icount:
1079         percpu_counter_destroy(&mp->m_icount);
1080         return -ENOMEM;
1081 }
1082
1083 void
1084 xfs_reinit_percpu_counters(
1085         struct xfs_mount        *mp)
1086 {
1087         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1088         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1089         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1090         percpu_counter_set(&mp->m_frextents, mp->m_sb.sb_frextents);
1091 }
1092
1093 static void
1094 xfs_destroy_percpu_counters(
1095         struct xfs_mount        *mp)
1096 {
1097         percpu_counter_destroy(&mp->m_icount);
1098         percpu_counter_destroy(&mp->m_ifree);
1099         percpu_counter_destroy(&mp->m_fdblocks);
1100         ASSERT(xfs_is_shutdown(mp) ||
1101                percpu_counter_sum(&mp->m_delalloc_rtextents) == 0);
1102         percpu_counter_destroy(&mp->m_delalloc_rtextents);
1103         ASSERT(xfs_is_shutdown(mp) ||
1104                percpu_counter_sum(&mp->m_delalloc_blks) == 0);
1105         percpu_counter_destroy(&mp->m_delalloc_blks);
1106         percpu_counter_destroy(&mp->m_frextents);
1107 }
1108
1109 static int
1110 xfs_inodegc_init_percpu(
1111         struct xfs_mount        *mp)
1112 {
1113         struct xfs_inodegc      *gc;
1114         int                     cpu;
1115
1116         mp->m_inodegc = alloc_percpu(struct xfs_inodegc);
1117         if (!mp->m_inodegc)
1118                 return -ENOMEM;
1119
1120         for_each_possible_cpu(cpu) {
1121                 gc = per_cpu_ptr(mp->m_inodegc, cpu);
1122                 gc->cpu = cpu;
1123                 gc->mp = mp;
1124                 init_llist_head(&gc->list);
1125                 gc->items = 0;
1126                 gc->error = 0;
1127                 INIT_DELAYED_WORK(&gc->work, xfs_inodegc_worker);
1128         }
1129         return 0;
1130 }
1131
1132 static void
1133 xfs_inodegc_free_percpu(
1134         struct xfs_mount        *mp)
1135 {
1136         if (!mp->m_inodegc)
1137                 return;
1138         free_percpu(mp->m_inodegc);
1139 }
1140
1141 static void
1142 xfs_fs_put_super(
1143         struct super_block      *sb)
1144 {
1145         struct xfs_mount        *mp = XFS_M(sb);
1146
1147         xfs_notice(mp, "Unmounting Filesystem %pU", &mp->m_sb.sb_uuid);
1148         xfs_filestream_unmount(mp);
1149         xfs_unmountfs(mp);
1150
1151         xfs_rtmount_freesb(mp);
1152         xfs_freesb(mp);
1153         xchk_mount_stats_free(mp);
1154         free_percpu(mp->m_stats.xs_stats);
1155         xfs_inodegc_free_percpu(mp);
1156         xfs_destroy_percpu_counters(mp);
1157         xfs_destroy_mount_workqueues(mp);
1158         xfs_shutdown_devices(mp);
1159 }
1160
1161 static long
1162 xfs_fs_nr_cached_objects(
1163         struct super_block      *sb,
1164         struct shrink_control   *sc)
1165 {
1166         /* Paranoia: catch incorrect calls during mount setup or teardown */
1167         if (WARN_ON_ONCE(!sb->s_fs_info))
1168                 return 0;
1169         return xfs_reclaim_inodes_count(XFS_M(sb));
1170 }
1171
1172 static long
1173 xfs_fs_free_cached_objects(
1174         struct super_block      *sb,
1175         struct shrink_control   *sc)
1176 {
1177         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1178 }
1179
1180 static void
1181 xfs_fs_shutdown(
1182         struct super_block      *sb)
1183 {
1184         xfs_force_shutdown(XFS_M(sb), SHUTDOWN_DEVICE_REMOVED);
1185 }
1186
1187 static const struct super_operations xfs_super_operations = {
1188         .alloc_inode            = xfs_fs_alloc_inode,
1189         .destroy_inode          = xfs_fs_destroy_inode,
1190         .dirty_inode            = xfs_fs_dirty_inode,
1191         .drop_inode             = xfs_fs_drop_inode,
1192         .put_super              = xfs_fs_put_super,
1193         .sync_fs                = xfs_fs_sync_fs,
1194         .freeze_fs              = xfs_fs_freeze,
1195         .unfreeze_fs            = xfs_fs_unfreeze,
1196         .statfs                 = xfs_fs_statfs,
1197         .show_options           = xfs_fs_show_options,
1198         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1199         .free_cached_objects    = xfs_fs_free_cached_objects,
1200         .shutdown               = xfs_fs_shutdown,
1201 };
1202
1203 static int
1204 suffix_kstrtoint(
1205         const char      *s,
1206         unsigned int    base,
1207         int             *res)
1208 {
1209         int             last, shift_left_factor = 0, _res;
1210         char            *value;
1211         int             ret = 0;
1212
1213         value = kstrdup(s, GFP_KERNEL);
1214         if (!value)
1215                 return -ENOMEM;
1216
1217         last = strlen(value) - 1;
1218         if (value[last] == 'K' || value[last] == 'k') {
1219                 shift_left_factor = 10;
1220                 value[last] = '\0';
1221         }
1222         if (value[last] == 'M' || value[last] == 'm') {
1223                 shift_left_factor = 20;
1224                 value[last] = '\0';
1225         }
1226         if (value[last] == 'G' || value[last] == 'g') {
1227                 shift_left_factor = 30;
1228                 value[last] = '\0';
1229         }
1230
1231         if (kstrtoint(value, base, &_res))
1232                 ret = -EINVAL;
1233         kfree(value);
1234         *res = _res << shift_left_factor;
1235         return ret;
1236 }
1237
1238 static inline void
1239 xfs_fs_warn_deprecated(
1240         struct fs_context       *fc,
1241         struct fs_parameter     *param,
1242         uint64_t                flag,
1243         bool                    value)
1244 {
1245         /* Don't print the warning if reconfiguring and current mount point
1246          * already had the flag set
1247          */
1248         if ((fc->purpose & FS_CONTEXT_FOR_RECONFIGURE) &&
1249             !!(XFS_M(fc->root->d_sb)->m_features & flag) == value)
1250                 return;
1251         xfs_warn(fc->s_fs_info, "%s mount option is deprecated.", param->key);
1252 }
1253
1254 /*
1255  * Set mount state from a mount option.
1256  *
1257  * NOTE: mp->m_super is NULL here!
1258  */
1259 static int
1260 xfs_fs_parse_param(
1261         struct fs_context       *fc,
1262         struct fs_parameter     *param)
1263 {
1264         struct xfs_mount        *parsing_mp = fc->s_fs_info;
1265         struct fs_parse_result  result;
1266         int                     size = 0;
1267         int                     opt;
1268
1269         BUILD_BUG_ON(XFS_QFLAGS_MNTOPTS & XFS_MOUNT_QUOTA_ALL);
1270
1271         opt = fs_parse(fc, xfs_fs_parameters, param, &result);
1272         if (opt < 0)
1273                 return opt;
1274
1275         switch (opt) {
1276         case Opt_logbufs:
1277                 parsing_mp->m_logbufs = result.uint_32;
1278                 return 0;
1279         case Opt_logbsize:
1280                 if (suffix_kstrtoint(param->string, 10, &parsing_mp->m_logbsize))
1281                         return -EINVAL;
1282                 return 0;
1283         case Opt_logdev:
1284                 kfree(parsing_mp->m_logname);
1285                 parsing_mp->m_logname = kstrdup(param->string, GFP_KERNEL);
1286                 if (!parsing_mp->m_logname)
1287                         return -ENOMEM;
1288                 return 0;
1289         case Opt_rtdev:
1290                 kfree(parsing_mp->m_rtname);
1291                 parsing_mp->m_rtname = kstrdup(param->string, GFP_KERNEL);
1292                 if (!parsing_mp->m_rtname)
1293                         return -ENOMEM;
1294                 return 0;
1295         case Opt_allocsize:
1296                 if (suffix_kstrtoint(param->string, 10, &size))
1297                         return -EINVAL;
1298                 parsing_mp->m_allocsize_log = ffs(size) - 1;
1299                 parsing_mp->m_features |= XFS_FEAT_ALLOCSIZE;
1300                 return 0;
1301         case Opt_grpid:
1302         case Opt_bsdgroups:
1303                 parsing_mp->m_features |= XFS_FEAT_GRPID;
1304                 return 0;
1305         case Opt_nogrpid:
1306         case Opt_sysvgroups:
1307                 parsing_mp->m_features &= ~XFS_FEAT_GRPID;
1308                 return 0;
1309         case Opt_wsync:
1310                 parsing_mp->m_features |= XFS_FEAT_WSYNC;
1311                 return 0;
1312         case Opt_norecovery:
1313                 parsing_mp->m_features |= XFS_FEAT_NORECOVERY;
1314                 return 0;
1315         case Opt_noalign:
1316                 parsing_mp->m_features |= XFS_FEAT_NOALIGN;
1317                 return 0;
1318         case Opt_swalloc:
1319                 parsing_mp->m_features |= XFS_FEAT_SWALLOC;
1320                 return 0;
1321         case Opt_sunit:
1322                 parsing_mp->m_dalign = result.uint_32;
1323                 return 0;
1324         case Opt_swidth:
1325                 parsing_mp->m_swidth = result.uint_32;
1326                 return 0;
1327         case Opt_inode32:
1328                 parsing_mp->m_features |= XFS_FEAT_SMALL_INUMS;
1329                 return 0;
1330         case Opt_inode64:
1331                 parsing_mp->m_features &= ~XFS_FEAT_SMALL_INUMS;
1332                 return 0;
1333         case Opt_nouuid:
1334                 parsing_mp->m_features |= XFS_FEAT_NOUUID;
1335                 return 0;
1336         case Opt_largeio:
1337                 parsing_mp->m_features |= XFS_FEAT_LARGE_IOSIZE;
1338                 return 0;
1339         case Opt_nolargeio:
1340                 parsing_mp->m_features &= ~XFS_FEAT_LARGE_IOSIZE;
1341                 return 0;
1342         case Opt_filestreams:
1343                 parsing_mp->m_features |= XFS_FEAT_FILESTREAMS;
1344                 return 0;
1345         case Opt_noquota:
1346                 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
1347                 parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
1348                 parsing_mp->m_qflags |= XFS_QFLAGS_MNTOPTS;
1349                 return 0;
1350         case Opt_quota:
1351         case Opt_uquota:
1352         case Opt_usrquota:
1353                 parsing_mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ENFD);
1354                 parsing_mp->m_qflags |= XFS_QFLAGS_MNTOPTS;
1355                 return 0;
1356         case Opt_qnoenforce:
1357         case Opt_uqnoenforce:
1358                 parsing_mp->m_qflags |= XFS_UQUOTA_ACCT;
1359                 parsing_mp->m_qflags &= ~XFS_UQUOTA_ENFD;
1360                 parsing_mp->m_qflags |= XFS_QFLAGS_MNTOPTS;
1361                 return 0;
1362         case Opt_pquota:
1363         case Opt_prjquota:
1364                 parsing_mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ENFD);
1365                 parsing_mp->m_qflags |= XFS_QFLAGS_MNTOPTS;
1366                 return 0;
1367         case Opt_pqnoenforce:
1368                 parsing_mp->m_qflags |= XFS_PQUOTA_ACCT;
1369                 parsing_mp->m_qflags &= ~XFS_PQUOTA_ENFD;
1370                 parsing_mp->m_qflags |= XFS_QFLAGS_MNTOPTS;
1371                 return 0;
1372         case Opt_gquota:
1373         case Opt_grpquota:
1374                 parsing_mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ENFD);
1375                 parsing_mp->m_qflags |= XFS_QFLAGS_MNTOPTS;
1376                 return 0;
1377         case Opt_gqnoenforce:
1378                 parsing_mp->m_qflags |= XFS_GQUOTA_ACCT;
1379                 parsing_mp->m_qflags &= ~XFS_GQUOTA_ENFD;
1380                 parsing_mp->m_qflags |= XFS_QFLAGS_MNTOPTS;
1381                 return 0;
1382         case Opt_discard:
1383                 parsing_mp->m_features |= XFS_FEAT_DISCARD;
1384                 return 0;
1385         case Opt_nodiscard:
1386                 parsing_mp->m_features &= ~XFS_FEAT_DISCARD;
1387                 return 0;
1388 #ifdef CONFIG_FS_DAX
1389         case Opt_dax:
1390                 xfs_mount_set_dax_mode(parsing_mp, XFS_DAX_ALWAYS);
1391                 return 0;
1392         case Opt_dax_enum:
1393                 xfs_mount_set_dax_mode(parsing_mp, result.uint_32);
1394                 return 0;
1395 #endif
1396         /* Following mount options will be removed in September 2025 */
1397         case Opt_ikeep:
1398                 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_IKEEP, true);
1399                 parsing_mp->m_features |= XFS_FEAT_IKEEP;
1400                 return 0;
1401         case Opt_noikeep:
1402                 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_IKEEP, false);
1403                 parsing_mp->m_features &= ~XFS_FEAT_IKEEP;
1404                 return 0;
1405         case Opt_attr2:
1406                 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_ATTR2, true);
1407                 parsing_mp->m_features |= XFS_FEAT_ATTR2;
1408                 return 0;
1409         case Opt_noattr2:
1410                 xfs_fs_warn_deprecated(fc, param, XFS_FEAT_NOATTR2, true);
1411                 parsing_mp->m_features |= XFS_FEAT_NOATTR2;
1412                 return 0;
1413         default:
1414                 xfs_warn(parsing_mp, "unknown mount option [%s].", param->key);
1415                 return -EINVAL;
1416         }
1417
1418         return 0;
1419 }
1420
1421 static int
1422 xfs_fs_validate_params(
1423         struct xfs_mount        *mp)
1424 {
1425         /* No recovery flag requires a read-only mount */
1426         if (xfs_has_norecovery(mp) && !xfs_is_readonly(mp)) {
1427                 xfs_warn(mp, "no-recovery mounts must be read-only.");
1428                 return -EINVAL;
1429         }
1430
1431         /*
1432          * We have not read the superblock at this point, so only the attr2
1433          * mount option can set the attr2 feature by this stage.
1434          */
1435         if (xfs_has_attr2(mp) && xfs_has_noattr2(mp)) {
1436                 xfs_warn(mp, "attr2 and noattr2 cannot both be specified.");
1437                 return -EINVAL;
1438         }
1439
1440
1441         if (xfs_has_noalign(mp) && (mp->m_dalign || mp->m_swidth)) {
1442                 xfs_warn(mp,
1443         "sunit and swidth options incompatible with the noalign option");
1444                 return -EINVAL;
1445         }
1446
1447         if (!IS_ENABLED(CONFIG_XFS_QUOTA) &&
1448             (mp->m_qflags & ~XFS_QFLAGS_MNTOPTS)) {
1449                 xfs_warn(mp, "quota support not available in this kernel.");
1450                 return -EINVAL;
1451         }
1452
1453         if ((mp->m_dalign && !mp->m_swidth) ||
1454             (!mp->m_dalign && mp->m_swidth)) {
1455                 xfs_warn(mp, "sunit and swidth must be specified together");
1456                 return -EINVAL;
1457         }
1458
1459         if (mp->m_dalign && (mp->m_swidth % mp->m_dalign != 0)) {
1460                 xfs_warn(mp,
1461         "stripe width (%d) must be a multiple of the stripe unit (%d)",
1462                         mp->m_swidth, mp->m_dalign);
1463                 return -EINVAL;
1464         }
1465
1466         if (mp->m_logbufs != -1 &&
1467             mp->m_logbufs != 0 &&
1468             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
1469              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
1470                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
1471                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
1472                 return -EINVAL;
1473         }
1474
1475         if (mp->m_logbsize != -1 &&
1476             mp->m_logbsize !=  0 &&
1477             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
1478              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
1479              !is_power_of_2(mp->m_logbsize))) {
1480                 xfs_warn(mp,
1481                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
1482                         mp->m_logbsize);
1483                 return -EINVAL;
1484         }
1485
1486         if (xfs_has_allocsize(mp) &&
1487             (mp->m_allocsize_log > XFS_MAX_IO_LOG ||
1488              mp->m_allocsize_log < XFS_MIN_IO_LOG)) {
1489                 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
1490                         mp->m_allocsize_log, XFS_MIN_IO_LOG, XFS_MAX_IO_LOG);
1491                 return -EINVAL;
1492         }
1493
1494         return 0;
1495 }
1496
1497 struct dentry *
1498 xfs_debugfs_mkdir(
1499         const char      *name,
1500         struct dentry   *parent)
1501 {
1502         struct dentry   *child;
1503
1504         /* Apparently we're expected to ignore error returns?? */
1505         child = debugfs_create_dir(name, parent);
1506         if (IS_ERR(child))
1507                 return NULL;
1508
1509         return child;
1510 }
1511
1512 static int
1513 xfs_fs_fill_super(
1514         struct super_block      *sb,
1515         struct fs_context       *fc)
1516 {
1517         struct xfs_mount        *mp = sb->s_fs_info;
1518         struct inode            *root;
1519         int                     flags = 0, error;
1520
1521         mp->m_super = sb;
1522
1523         /*
1524          * Copy VFS mount flags from the context now that all parameter parsing
1525          * is guaranteed to have been completed by either the old mount API or
1526          * the newer fsopen/fsconfig API.
1527          */
1528         if (fc->sb_flags & SB_RDONLY)
1529                 xfs_set_readonly(mp);
1530         if (fc->sb_flags & SB_DIRSYNC)
1531                 mp->m_features |= XFS_FEAT_DIRSYNC;
1532         if (fc->sb_flags & SB_SYNCHRONOUS)
1533                 mp->m_features |= XFS_FEAT_WSYNC;
1534
1535         error = xfs_fs_validate_params(mp);
1536         if (error)
1537                 return error;
1538
1539         sb_min_blocksize(sb, BBSIZE);
1540         sb->s_xattr = xfs_xattr_handlers;
1541         sb->s_export_op = &xfs_export_operations;
1542 #ifdef CONFIG_XFS_QUOTA
1543         sb->s_qcop = &xfs_quotactl_operations;
1544         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1545 #endif
1546         sb->s_op = &xfs_super_operations;
1547
1548         /*
1549          * Delay mount work if the debug hook is set. This is debug
1550          * instrumention to coordinate simulation of xfs mount failures with
1551          * VFS superblock operations
1552          */
1553         if (xfs_globals.mount_delay) {
1554                 xfs_notice(mp, "Delaying mount for %d seconds.",
1555                         xfs_globals.mount_delay);
1556                 msleep(xfs_globals.mount_delay * 1000);
1557         }
1558
1559         if (fc->sb_flags & SB_SILENT)
1560                 flags |= XFS_MFSI_QUIET;
1561
1562         error = xfs_open_devices(mp);
1563         if (error)
1564                 return error;
1565
1566         if (xfs_debugfs) {
1567                 mp->m_debugfs = xfs_debugfs_mkdir(mp->m_super->s_id,
1568                                                   xfs_debugfs);
1569         } else {
1570                 mp->m_debugfs = NULL;
1571         }
1572
1573         error = xfs_init_mount_workqueues(mp);
1574         if (error)
1575                 goto out_shutdown_devices;
1576
1577         error = xfs_init_percpu_counters(mp);
1578         if (error)
1579                 goto out_destroy_workqueues;
1580
1581         error = xfs_inodegc_init_percpu(mp);
1582         if (error)
1583                 goto out_destroy_counters;
1584
1585         /* Allocate stats memory before we do operations that might use it */
1586         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1587         if (!mp->m_stats.xs_stats) {
1588                 error = -ENOMEM;
1589                 goto out_destroy_inodegc;
1590         }
1591
1592         error = xchk_mount_stats_alloc(mp);
1593         if (error)
1594                 goto out_free_stats;
1595
1596         error = xfs_readsb(mp, flags);
1597         if (error)
1598                 goto out_free_scrub_stats;
1599
1600         error = xfs_finish_flags(mp);
1601         if (error)
1602                 goto out_free_sb;
1603
1604         error = xfs_setup_devices(mp);
1605         if (error)
1606                 goto out_free_sb;
1607
1608         /*
1609          * V4 support is undergoing deprecation.
1610          *
1611          * Note: this has to use an open coded m_features check as xfs_has_crc
1612          * always returns false for !CONFIG_XFS_SUPPORT_V4.
1613          */
1614         if (!(mp->m_features & XFS_FEAT_CRC)) {
1615                 if (!IS_ENABLED(CONFIG_XFS_SUPPORT_V4)) {
1616                         xfs_warn(mp,
1617         "Deprecated V4 format (crc=0) not supported by kernel.");
1618                         error = -EINVAL;
1619                         goto out_free_sb;
1620                 }
1621                 xfs_warn_once(mp,
1622         "Deprecated V4 format (crc=0) will not be supported after September 2030.");
1623         }
1624
1625         /* ASCII case insensitivity is undergoing deprecation. */
1626         if (xfs_has_asciici(mp)) {
1627 #ifdef CONFIG_XFS_SUPPORT_ASCII_CI
1628                 xfs_warn_once(mp,
1629         "Deprecated ASCII case-insensitivity feature (ascii-ci=1) will not be supported after September 2030.");
1630 #else
1631                 xfs_warn(mp,
1632         "Deprecated ASCII case-insensitivity feature (ascii-ci=1) not supported by kernel.");
1633                 error = -EINVAL;
1634                 goto out_free_sb;
1635 #endif
1636         }
1637
1638         /* Filesystem claims it needs repair, so refuse the mount. */
1639         if (xfs_has_needsrepair(mp)) {
1640                 xfs_warn(mp, "Filesystem needs repair.  Please run xfs_repair.");
1641                 error = -EFSCORRUPTED;
1642                 goto out_free_sb;
1643         }
1644
1645         /*
1646          * Don't touch the filesystem if a user tool thinks it owns the primary
1647          * superblock.  mkfs doesn't clear the flag from secondary supers, so
1648          * we don't check them at all.
1649          */
1650         if (mp->m_sb.sb_inprogress) {
1651                 xfs_warn(mp, "Offline file system operation in progress!");
1652                 error = -EFSCORRUPTED;
1653                 goto out_free_sb;
1654         }
1655
1656         if (mp->m_sb.sb_blocksize > PAGE_SIZE) {
1657                 size_t max_folio_size = mapping_max_folio_size_supported();
1658
1659                 if (!xfs_has_crc(mp)) {
1660                         xfs_warn(mp,
1661 "V4 Filesystem with blocksize %d bytes. Only pagesize (%ld) or less is supported.",
1662                                 mp->m_sb.sb_blocksize, PAGE_SIZE);
1663                         error = -ENOSYS;
1664                         goto out_free_sb;
1665                 }
1666
1667                 if (mp->m_sb.sb_blocksize > max_folio_size) {
1668                         xfs_warn(mp,
1669 "block size (%u bytes) not supported; Only block size (%zu) or less is supported",
1670                                 mp->m_sb.sb_blocksize, max_folio_size);
1671                         error = -ENOSYS;
1672                         goto out_free_sb;
1673                 }
1674
1675                 xfs_warn_experimental(mp, XFS_EXPERIMENTAL_LBS);
1676         }
1677
1678         /* Ensure this filesystem fits in the page cache limits */
1679         if (xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_dblocks) ||
1680             xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_rblocks)) {
1681                 xfs_warn(mp,
1682                 "file system too large to be mounted on this system.");
1683                 error = -EFBIG;
1684                 goto out_free_sb;
1685         }
1686
1687         /*
1688          * XFS block mappings use 54 bits to store the logical block offset.
1689          * This should suffice to handle the maximum file size that the VFS
1690          * supports (currently 2^63 bytes on 64-bit and ULONG_MAX << PAGE_SHIFT
1691          * bytes on 32-bit), but as XFS and VFS have gotten the s_maxbytes
1692          * calculation wrong on 32-bit kernels in the past, we'll add a WARN_ON
1693          * to check this assertion.
1694          *
1695          * Avoid integer overflow by comparing the maximum bmbt offset to the
1696          * maximum pagecache offset in units of fs blocks.
1697          */
1698         if (!xfs_verify_fileoff(mp, XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE))) {
1699                 xfs_warn(mp,
1700 "MAX_LFS_FILESIZE block offset (%llu) exceeds extent map maximum (%llu)!",
1701                          XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE),
1702                          XFS_MAX_FILEOFF);
1703                 error = -EINVAL;
1704                 goto out_free_sb;
1705         }
1706
1707         error = xfs_rtmount_readsb(mp);
1708         if (error)
1709                 goto out_free_sb;
1710
1711         error = xfs_filestream_mount(mp);
1712         if (error)
1713                 goto out_free_rtsb;
1714
1715         /*
1716          * we must configure the block size in the superblock before we run the
1717          * full mount process as the mount process can lookup and cache inodes.
1718          */
1719         sb->s_magic = XFS_SUPER_MAGIC;
1720         sb->s_blocksize = mp->m_sb.sb_blocksize;
1721         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1722         sb->s_maxbytes = MAX_LFS_FILESIZE;
1723         sb->s_max_links = XFS_MAXLINK;
1724         sb->s_time_gran = 1;
1725         if (xfs_has_bigtime(mp)) {
1726                 sb->s_time_min = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MIN);
1727                 sb->s_time_max = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MAX);
1728         } else {
1729                 sb->s_time_min = XFS_LEGACY_TIME_MIN;
1730                 sb->s_time_max = XFS_LEGACY_TIME_MAX;
1731         }
1732         trace_xfs_inode_timestamp_range(mp, sb->s_time_min, sb->s_time_max);
1733         sb->s_iflags |= SB_I_CGROUPWB;
1734
1735         set_posix_acl_flag(sb);
1736
1737         /* version 5 superblocks support inode version counters. */
1738         if (xfs_has_crc(mp))
1739                 sb->s_flags |= SB_I_VERSION;
1740
1741         if (xfs_has_dax_always(mp)) {
1742                 error = xfs_setup_dax_always(mp);
1743                 if (error)
1744                         goto out_filestream_unmount;
1745         }
1746
1747         if (xfs_has_discard(mp) && !bdev_max_discard_sectors(sb->s_bdev)) {
1748                 xfs_warn(mp,
1749         "mounting with \"discard\" option, but the device does not support discard");
1750                 mp->m_features &= ~XFS_FEAT_DISCARD;
1751         }
1752
1753         if (xfs_has_metadir(mp))
1754                 xfs_warn_experimental(mp, XFS_EXPERIMENTAL_METADIR);
1755
1756         if (xfs_has_reflink(mp)) {
1757                 if (mp->m_sb.sb_rblocks) {
1758                         xfs_alert(mp,
1759         "reflink not compatible with realtime device!");
1760                         error = -EINVAL;
1761                         goto out_filestream_unmount;
1762                 }
1763
1764                 if (xfs_globals.always_cow) {
1765                         xfs_info(mp, "using DEBUG-only always_cow mode.");
1766                         mp->m_always_cow = true;
1767                 }
1768         }
1769
1770         if (xfs_has_rmapbt(mp) && mp->m_sb.sb_rblocks) {
1771                 xfs_alert(mp,
1772         "reverse mapping btree not compatible with realtime device!");
1773                 error = -EINVAL;
1774                 goto out_filestream_unmount;
1775         }
1776
1777         if (xfs_has_exchange_range(mp))
1778                 xfs_warn_experimental(mp, XFS_EXPERIMENTAL_EXCHRANGE);
1779
1780         if (xfs_has_parent(mp))
1781                 xfs_warn_experimental(mp, XFS_EXPERIMENTAL_PPTR);
1782
1783         /*
1784          * If no quota mount options were provided, maybe we'll try to pick
1785          * up the quota accounting and enforcement flags from the ondisk sb.
1786          */
1787         if (!(mp->m_qflags & XFS_QFLAGS_MNTOPTS))
1788                 xfs_set_resuming_quotaon(mp);
1789         mp->m_qflags &= ~XFS_QFLAGS_MNTOPTS;
1790
1791         error = xfs_mountfs(mp);
1792         if (error)
1793                 goto out_filestream_unmount;
1794
1795         root = igrab(VFS_I(mp->m_rootip));
1796         if (!root) {
1797                 error = -ENOENT;
1798                 goto out_unmount;
1799         }
1800         sb->s_root = d_make_root(root);
1801         if (!sb->s_root) {
1802                 error = -ENOMEM;
1803                 goto out_unmount;
1804         }
1805
1806         return 0;
1807
1808  out_filestream_unmount:
1809         xfs_filestream_unmount(mp);
1810  out_free_rtsb:
1811         xfs_rtmount_freesb(mp);
1812  out_free_sb:
1813         xfs_freesb(mp);
1814  out_free_scrub_stats:
1815         xchk_mount_stats_free(mp);
1816  out_free_stats:
1817         free_percpu(mp->m_stats.xs_stats);
1818  out_destroy_inodegc:
1819         xfs_inodegc_free_percpu(mp);
1820  out_destroy_counters:
1821         xfs_destroy_percpu_counters(mp);
1822  out_destroy_workqueues:
1823         xfs_destroy_mount_workqueues(mp);
1824  out_shutdown_devices:
1825         xfs_shutdown_devices(mp);
1826         return error;
1827
1828  out_unmount:
1829         xfs_filestream_unmount(mp);
1830         xfs_unmountfs(mp);
1831         goto out_free_rtsb;
1832 }
1833
1834 static int
1835 xfs_fs_get_tree(
1836         struct fs_context       *fc)
1837 {
1838         return get_tree_bdev(fc, xfs_fs_fill_super);
1839 }
1840
1841 static int
1842 xfs_remount_rw(
1843         struct xfs_mount        *mp)
1844 {
1845         struct xfs_sb           *sbp = &mp->m_sb;
1846         int error;
1847
1848         if (xfs_has_norecovery(mp)) {
1849                 xfs_warn(mp,
1850                         "ro->rw transition prohibited on norecovery mount");
1851                 return -EINVAL;
1852         }
1853
1854         if (xfs_sb_is_v5(sbp) &&
1855             xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1856                 xfs_warn(mp,
1857         "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1858                         (sbp->sb_features_ro_compat &
1859                                 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1860                 return -EINVAL;
1861         }
1862
1863         xfs_clear_readonly(mp);
1864
1865         /*
1866          * If this is the first remount to writeable state we might have some
1867          * superblock changes to update.
1868          */
1869         if (mp->m_update_sb) {
1870                 error = xfs_sync_sb(mp, false);
1871                 if (error) {
1872                         xfs_warn(mp, "failed to write sb changes");
1873                         return error;
1874                 }
1875                 mp->m_update_sb = false;
1876         }
1877
1878         /*
1879          * Fill out the reserve pool if it is empty. Use the stashed value if
1880          * it is non-zero, otherwise go with the default.
1881          */
1882         xfs_restore_resvblks(mp);
1883         xfs_log_work_queue(mp);
1884         xfs_blockgc_start(mp);
1885
1886         /* Create the per-AG metadata reservation pool .*/
1887         error = xfs_fs_reserve_ag_blocks(mp);
1888         if (error && error != -ENOSPC)
1889                 return error;
1890
1891         /* Re-enable the background inode inactivation worker. */
1892         xfs_inodegc_start(mp);
1893
1894         return 0;
1895 }
1896
1897 static int
1898 xfs_remount_ro(
1899         struct xfs_mount        *mp)
1900 {
1901         struct xfs_icwalk       icw = {
1902                 .icw_flags      = XFS_ICWALK_FLAG_SYNC,
1903         };
1904         int                     error;
1905
1906         /* Flush all the dirty data to disk. */
1907         error = sync_filesystem(mp->m_super);
1908         if (error)
1909                 return error;
1910
1911         /*
1912          * Cancel background eofb scanning so it cannot race with the final
1913          * log force+buftarg wait and deadlock the remount.
1914          */
1915         xfs_blockgc_stop(mp);
1916
1917         /*
1918          * Clear out all remaining COW staging extents and speculative post-EOF
1919          * preallocations so that we don't leave inodes requiring inactivation
1920          * cleanups during reclaim on a read-only mount.  We must process every
1921          * cached inode, so this requires a synchronous cache scan.
1922          */
1923         error = xfs_blockgc_free_space(mp, &icw);
1924         if (error) {
1925                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1926                 return error;
1927         }
1928
1929         /*
1930          * Stop the inodegc background worker.  xfs_fs_reconfigure already
1931          * flushed all pending inodegc work when it sync'd the filesystem.
1932          * The VFS holds s_umount, so we know that inodes cannot enter
1933          * xfs_fs_destroy_inode during a remount operation.  In readonly mode
1934          * we send inodes straight to reclaim, so no inodes will be queued.
1935          */
1936         xfs_inodegc_stop(mp);
1937
1938         /* Free the per-AG metadata reservation pool. */
1939         xfs_fs_unreserve_ag_blocks(mp);
1940
1941         /*
1942          * Before we sync the metadata, we need to free up the reserve block
1943          * pool so that the used block count in the superblock on disk is
1944          * correct at the end of the remount. Stash the current* reserve pool
1945          * size so that if we get remounted rw, we can return it to the same
1946          * size.
1947          */
1948         xfs_save_resvblks(mp);
1949
1950         xfs_log_clean(mp);
1951         xfs_set_readonly(mp);
1952
1953         return 0;
1954 }
1955
1956 /*
1957  * Logically we would return an error here to prevent users from believing
1958  * they might have changed mount options using remount which can't be changed.
1959  *
1960  * But unfortunately mount(8) adds all options from mtab and fstab to the mount
1961  * arguments in some cases so we can't blindly reject options, but have to
1962  * check for each specified option if it actually differs from the currently
1963  * set option and only reject it if that's the case.
1964  *
1965  * Until that is implemented we return success for every remount request, and
1966  * silently ignore all options that we can't actually change.
1967  */
1968 static int
1969 xfs_fs_reconfigure(
1970         struct fs_context *fc)
1971 {
1972         struct xfs_mount        *mp = XFS_M(fc->root->d_sb);
1973         struct xfs_mount        *new_mp = fc->s_fs_info;
1974         int                     flags = fc->sb_flags;
1975         int                     error;
1976
1977         new_mp->m_qflags &= ~XFS_QFLAGS_MNTOPTS;
1978
1979         /* version 5 superblocks always support version counters. */
1980         if (xfs_has_crc(mp))
1981                 fc->sb_flags |= SB_I_VERSION;
1982
1983         error = xfs_fs_validate_params(new_mp);
1984         if (error)
1985                 return error;
1986
1987         /* inode32 -> inode64 */
1988         if (xfs_has_small_inums(mp) && !xfs_has_small_inums(new_mp)) {
1989                 mp->m_features &= ~XFS_FEAT_SMALL_INUMS;
1990                 mp->m_maxagi = xfs_set_inode_alloc(mp, mp->m_sb.sb_agcount);
1991         }
1992
1993         /* inode64 -> inode32 */
1994         if (!xfs_has_small_inums(mp) && xfs_has_small_inums(new_mp)) {
1995                 mp->m_features |= XFS_FEAT_SMALL_INUMS;
1996                 mp->m_maxagi = xfs_set_inode_alloc(mp, mp->m_sb.sb_agcount);
1997         }
1998
1999         /* ro -> rw */
2000         if (xfs_is_readonly(mp) && !(flags & SB_RDONLY)) {
2001                 error = xfs_remount_rw(mp);
2002                 if (error)
2003                         return error;
2004         }
2005
2006         /* rw -> ro */
2007         if (!xfs_is_readonly(mp) && (flags & SB_RDONLY)) {
2008                 error = xfs_remount_ro(mp);
2009                 if (error)
2010                         return error;
2011         }
2012
2013         return 0;
2014 }
2015
2016 static void
2017 xfs_fs_free(
2018         struct fs_context       *fc)
2019 {
2020         struct xfs_mount        *mp = fc->s_fs_info;
2021
2022         /*
2023          * mp is stored in the fs_context when it is initialized.
2024          * mp is transferred to the superblock on a successful mount,
2025          * but if an error occurs before the transfer we have to free
2026          * it here.
2027          */
2028         if (mp)
2029                 xfs_mount_free(mp);
2030 }
2031
2032 static const struct fs_context_operations xfs_context_ops = {
2033         .parse_param = xfs_fs_parse_param,
2034         .get_tree    = xfs_fs_get_tree,
2035         .reconfigure = xfs_fs_reconfigure,
2036         .free        = xfs_fs_free,
2037 };
2038
2039 /*
2040  * WARNING: do not initialise any parameters in this function that depend on
2041  * mount option parsing having already been performed as this can be called from
2042  * fsopen() before any parameters have been set.
2043  */
2044 static int
2045 xfs_init_fs_context(
2046         struct fs_context       *fc)
2047 {
2048         struct xfs_mount        *mp;
2049         int                     i;
2050
2051         mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL | __GFP_NOFAIL);
2052         if (!mp)
2053                 return -ENOMEM;
2054
2055         spin_lock_init(&mp->m_sb_lock);
2056         for (i = 0; i < XG_TYPE_MAX; i++)
2057                 xa_init(&mp->m_groups[i].xa);
2058         mutex_init(&mp->m_growlock);
2059         INIT_WORK(&mp->m_flush_inodes_work, xfs_flush_inodes_worker);
2060         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
2061         mp->m_kobj.kobject.kset = xfs_kset;
2062         /*
2063          * We don't create the finobt per-ag space reservation until after log
2064          * recovery, so we must set this to true so that an ifree transaction
2065          * started during log recovery will not depend on space reservations
2066          * for finobt expansion.
2067          */
2068         mp->m_finobt_nores = true;
2069
2070         /*
2071          * These can be overridden by the mount option parsing.
2072          */
2073         mp->m_logbufs = -1;
2074         mp->m_logbsize = -1;
2075         mp->m_allocsize_log = 16; /* 64k */
2076
2077         xfs_hooks_init(&mp->m_dir_update_hooks);
2078
2079         fc->s_fs_info = mp;
2080         fc->ops = &xfs_context_ops;
2081
2082         return 0;
2083 }
2084
2085 static void
2086 xfs_kill_sb(
2087         struct super_block              *sb)
2088 {
2089         kill_block_super(sb);
2090         xfs_mount_free(XFS_M(sb));
2091 }
2092
2093 static struct file_system_type xfs_fs_type = {
2094         .owner                  = THIS_MODULE,
2095         .name                   = "xfs",
2096         .init_fs_context        = xfs_init_fs_context,
2097         .parameters             = xfs_fs_parameters,
2098         .kill_sb                = xfs_kill_sb,
2099         .fs_flags               = FS_REQUIRES_DEV | FS_ALLOW_IDMAP | FS_MGTIME,
2100 };
2101 MODULE_ALIAS_FS("xfs");
2102
2103 STATIC int __init
2104 xfs_init_caches(void)
2105 {
2106         int             error;
2107
2108         xfs_buf_cache = kmem_cache_create("xfs_buf", sizeof(struct xfs_buf), 0,
2109                                          SLAB_HWCACHE_ALIGN |
2110                                          SLAB_RECLAIM_ACCOUNT,
2111                                          NULL);
2112         if (!xfs_buf_cache)
2113                 goto out;
2114
2115         xfs_log_ticket_cache = kmem_cache_create("xfs_log_ticket",
2116                                                 sizeof(struct xlog_ticket),
2117                                                 0, 0, NULL);
2118         if (!xfs_log_ticket_cache)
2119                 goto out_destroy_buf_cache;
2120
2121         error = xfs_btree_init_cur_caches();
2122         if (error)
2123                 goto out_destroy_log_ticket_cache;
2124
2125         error = rcbagbt_init_cur_cache();
2126         if (error)
2127                 goto out_destroy_btree_cur_cache;
2128
2129         error = xfs_defer_init_item_caches();
2130         if (error)
2131                 goto out_destroy_rcbagbt_cur_cache;
2132
2133         xfs_da_state_cache = kmem_cache_create("xfs_da_state",
2134                                               sizeof(struct xfs_da_state),
2135                                               0, 0, NULL);
2136         if (!xfs_da_state_cache)
2137                 goto out_destroy_defer_item_cache;
2138
2139         xfs_ifork_cache = kmem_cache_create("xfs_ifork",
2140                                            sizeof(struct xfs_ifork),
2141                                            0, 0, NULL);
2142         if (!xfs_ifork_cache)
2143                 goto out_destroy_da_state_cache;
2144
2145         xfs_trans_cache = kmem_cache_create("xfs_trans",
2146                                            sizeof(struct xfs_trans),
2147                                            0, 0, NULL);
2148         if (!xfs_trans_cache)
2149                 goto out_destroy_ifork_cache;
2150
2151
2152         /*
2153          * The size of the cache-allocated buf log item is the maximum
2154          * size possible under XFS.  This wastes a little bit of memory,
2155          * but it is much faster.
2156          */
2157         xfs_buf_item_cache = kmem_cache_create("xfs_buf_item",
2158                                               sizeof(struct xfs_buf_log_item),
2159                                               0, 0, NULL);
2160         if (!xfs_buf_item_cache)
2161                 goto out_destroy_trans_cache;
2162
2163         xfs_efd_cache = kmem_cache_create("xfs_efd_item",
2164                         xfs_efd_log_item_sizeof(XFS_EFD_MAX_FAST_EXTENTS),
2165                         0, 0, NULL);
2166         if (!xfs_efd_cache)
2167                 goto out_destroy_buf_item_cache;
2168
2169         xfs_efi_cache = kmem_cache_create("xfs_efi_item",
2170                         xfs_efi_log_item_sizeof(XFS_EFI_MAX_FAST_EXTENTS),
2171                         0, 0, NULL);
2172         if (!xfs_efi_cache)
2173                 goto out_destroy_efd_cache;
2174
2175         xfs_inode_cache = kmem_cache_create("xfs_inode",
2176                                            sizeof(struct xfs_inode), 0,
2177                                            (SLAB_HWCACHE_ALIGN |
2178                                             SLAB_RECLAIM_ACCOUNT |
2179                                             SLAB_ACCOUNT),
2180                                            xfs_fs_inode_init_once);
2181         if (!xfs_inode_cache)
2182                 goto out_destroy_efi_cache;
2183
2184         xfs_ili_cache = kmem_cache_create("xfs_ili",
2185                                          sizeof(struct xfs_inode_log_item), 0,
2186                                          SLAB_RECLAIM_ACCOUNT,
2187                                          NULL);
2188         if (!xfs_ili_cache)
2189                 goto out_destroy_inode_cache;
2190
2191         xfs_icreate_cache = kmem_cache_create("xfs_icr",
2192                                              sizeof(struct xfs_icreate_item),
2193                                              0, 0, NULL);
2194         if (!xfs_icreate_cache)
2195                 goto out_destroy_ili_cache;
2196
2197         xfs_rud_cache = kmem_cache_create("xfs_rud_item",
2198                                          sizeof(struct xfs_rud_log_item),
2199                                          0, 0, NULL);
2200         if (!xfs_rud_cache)
2201                 goto out_destroy_icreate_cache;
2202
2203         xfs_rui_cache = kmem_cache_create("xfs_rui_item",
2204                         xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
2205                         0, 0, NULL);
2206         if (!xfs_rui_cache)
2207                 goto out_destroy_rud_cache;
2208
2209         xfs_cud_cache = kmem_cache_create("xfs_cud_item",
2210                                          sizeof(struct xfs_cud_log_item),
2211                                          0, 0, NULL);
2212         if (!xfs_cud_cache)
2213                 goto out_destroy_rui_cache;
2214
2215         xfs_cui_cache = kmem_cache_create("xfs_cui_item",
2216                         xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
2217                         0, 0, NULL);
2218         if (!xfs_cui_cache)
2219                 goto out_destroy_cud_cache;
2220
2221         xfs_bud_cache = kmem_cache_create("xfs_bud_item",
2222                                          sizeof(struct xfs_bud_log_item),
2223                                          0, 0, NULL);
2224         if (!xfs_bud_cache)
2225                 goto out_destroy_cui_cache;
2226
2227         xfs_bui_cache = kmem_cache_create("xfs_bui_item",
2228                         xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
2229                         0, 0, NULL);
2230         if (!xfs_bui_cache)
2231                 goto out_destroy_bud_cache;
2232
2233         xfs_attrd_cache = kmem_cache_create("xfs_attrd_item",
2234                                             sizeof(struct xfs_attrd_log_item),
2235                                             0, 0, NULL);
2236         if (!xfs_attrd_cache)
2237                 goto out_destroy_bui_cache;
2238
2239         xfs_attri_cache = kmem_cache_create("xfs_attri_item",
2240                                             sizeof(struct xfs_attri_log_item),
2241                                             0, 0, NULL);
2242         if (!xfs_attri_cache)
2243                 goto out_destroy_attrd_cache;
2244
2245         xfs_iunlink_cache = kmem_cache_create("xfs_iul_item",
2246                                              sizeof(struct xfs_iunlink_item),
2247                                              0, 0, NULL);
2248         if (!xfs_iunlink_cache)
2249                 goto out_destroy_attri_cache;
2250
2251         xfs_xmd_cache = kmem_cache_create("xfs_xmd_item",
2252                                          sizeof(struct xfs_xmd_log_item),
2253                                          0, 0, NULL);
2254         if (!xfs_xmd_cache)
2255                 goto out_destroy_iul_cache;
2256
2257         xfs_xmi_cache = kmem_cache_create("xfs_xmi_item",
2258                                          sizeof(struct xfs_xmi_log_item),
2259                                          0, 0, NULL);
2260         if (!xfs_xmi_cache)
2261                 goto out_destroy_xmd_cache;
2262
2263         xfs_parent_args_cache = kmem_cache_create("xfs_parent_args",
2264                                              sizeof(struct xfs_parent_args),
2265                                              0, 0, NULL);
2266         if (!xfs_parent_args_cache)
2267                 goto out_destroy_xmi_cache;
2268
2269         return 0;
2270
2271  out_destroy_xmi_cache:
2272         kmem_cache_destroy(xfs_xmi_cache);
2273  out_destroy_xmd_cache:
2274         kmem_cache_destroy(xfs_xmd_cache);
2275  out_destroy_iul_cache:
2276         kmem_cache_destroy(xfs_iunlink_cache);
2277  out_destroy_attri_cache:
2278         kmem_cache_destroy(xfs_attri_cache);
2279  out_destroy_attrd_cache:
2280         kmem_cache_destroy(xfs_attrd_cache);
2281  out_destroy_bui_cache:
2282         kmem_cache_destroy(xfs_bui_cache);
2283  out_destroy_bud_cache:
2284         kmem_cache_destroy(xfs_bud_cache);
2285  out_destroy_cui_cache:
2286         kmem_cache_destroy(xfs_cui_cache);
2287  out_destroy_cud_cache:
2288         kmem_cache_destroy(xfs_cud_cache);
2289  out_destroy_rui_cache:
2290         kmem_cache_destroy(xfs_rui_cache);
2291  out_destroy_rud_cache:
2292         kmem_cache_destroy(xfs_rud_cache);
2293  out_destroy_icreate_cache:
2294         kmem_cache_destroy(xfs_icreate_cache);
2295  out_destroy_ili_cache:
2296         kmem_cache_destroy(xfs_ili_cache);
2297  out_destroy_inode_cache:
2298         kmem_cache_destroy(xfs_inode_cache);
2299  out_destroy_efi_cache:
2300         kmem_cache_destroy(xfs_efi_cache);
2301  out_destroy_efd_cache:
2302         kmem_cache_destroy(xfs_efd_cache);
2303  out_destroy_buf_item_cache:
2304         kmem_cache_destroy(xfs_buf_item_cache);
2305  out_destroy_trans_cache:
2306         kmem_cache_destroy(xfs_trans_cache);
2307  out_destroy_ifork_cache:
2308         kmem_cache_destroy(xfs_ifork_cache);
2309  out_destroy_da_state_cache:
2310         kmem_cache_destroy(xfs_da_state_cache);
2311  out_destroy_defer_item_cache:
2312         xfs_defer_destroy_item_caches();
2313  out_destroy_rcbagbt_cur_cache:
2314         rcbagbt_destroy_cur_cache();
2315  out_destroy_btree_cur_cache:
2316         xfs_btree_destroy_cur_caches();
2317  out_destroy_log_ticket_cache:
2318         kmem_cache_destroy(xfs_log_ticket_cache);
2319  out_destroy_buf_cache:
2320         kmem_cache_destroy(xfs_buf_cache);
2321  out:
2322         return -ENOMEM;
2323 }
2324
2325 STATIC void
2326 xfs_destroy_caches(void)
2327 {
2328         /*
2329          * Make sure all delayed rcu free are flushed before we
2330          * destroy caches.
2331          */
2332         rcu_barrier();
2333         kmem_cache_destroy(xfs_parent_args_cache);
2334         kmem_cache_destroy(xfs_xmd_cache);
2335         kmem_cache_destroy(xfs_xmi_cache);
2336         kmem_cache_destroy(xfs_iunlink_cache);
2337         kmem_cache_destroy(xfs_attri_cache);
2338         kmem_cache_destroy(xfs_attrd_cache);
2339         kmem_cache_destroy(xfs_bui_cache);
2340         kmem_cache_destroy(xfs_bud_cache);
2341         kmem_cache_destroy(xfs_cui_cache);
2342         kmem_cache_destroy(xfs_cud_cache);
2343         kmem_cache_destroy(xfs_rui_cache);
2344         kmem_cache_destroy(xfs_rud_cache);
2345         kmem_cache_destroy(xfs_icreate_cache);
2346         kmem_cache_destroy(xfs_ili_cache);
2347         kmem_cache_destroy(xfs_inode_cache);
2348         kmem_cache_destroy(xfs_efi_cache);
2349         kmem_cache_destroy(xfs_efd_cache);
2350         kmem_cache_destroy(xfs_buf_item_cache);
2351         kmem_cache_destroy(xfs_trans_cache);
2352         kmem_cache_destroy(xfs_ifork_cache);
2353         kmem_cache_destroy(xfs_da_state_cache);
2354         xfs_defer_destroy_item_caches();
2355         rcbagbt_destroy_cur_cache();
2356         xfs_btree_destroy_cur_caches();
2357         kmem_cache_destroy(xfs_log_ticket_cache);
2358         kmem_cache_destroy(xfs_buf_cache);
2359 }
2360
2361 STATIC int __init
2362 xfs_init_workqueues(void)
2363 {
2364         /*
2365          * The allocation workqueue can be used in memory reclaim situations
2366          * (writepage path), and parallelism is only limited by the number of
2367          * AGs in all the filesystems mounted. Hence use the default large
2368          * max_active value for this workqueue.
2369          */
2370         xfs_alloc_wq = alloc_workqueue("xfsalloc",
2371                         XFS_WQFLAGS(WQ_MEM_RECLAIM | WQ_FREEZABLE), 0);
2372         if (!xfs_alloc_wq)
2373                 return -ENOMEM;
2374
2375         xfs_discard_wq = alloc_workqueue("xfsdiscard", XFS_WQFLAGS(WQ_UNBOUND),
2376                         0);
2377         if (!xfs_discard_wq)
2378                 goto out_free_alloc_wq;
2379
2380         return 0;
2381 out_free_alloc_wq:
2382         destroy_workqueue(xfs_alloc_wq);
2383         return -ENOMEM;
2384 }
2385
2386 STATIC void
2387 xfs_destroy_workqueues(void)
2388 {
2389         destroy_workqueue(xfs_discard_wq);
2390         destroy_workqueue(xfs_alloc_wq);
2391 }
2392
2393 STATIC int __init
2394 init_xfs_fs(void)
2395 {
2396         int                     error;
2397
2398         xfs_check_ondisk_structs();
2399
2400         error = xfs_dahash_test();
2401         if (error)
2402                 return error;
2403
2404         printk(KERN_INFO XFS_VERSION_STRING " with "
2405                          XFS_BUILD_OPTIONS " enabled\n");
2406
2407         xfs_dir_startup();
2408
2409         error = xfs_init_caches();
2410         if (error)
2411                 goto out;
2412
2413         error = xfs_init_workqueues();
2414         if (error)
2415                 goto out_destroy_caches;
2416
2417         error = xfs_mru_cache_init();
2418         if (error)
2419                 goto out_destroy_wq;
2420
2421         error = xfs_init_procfs();
2422         if (error)
2423                 goto out_mru_cache_uninit;
2424
2425         error = xfs_sysctl_register();
2426         if (error)
2427                 goto out_cleanup_procfs;
2428
2429         xfs_debugfs = xfs_debugfs_mkdir("xfs", NULL);
2430
2431         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
2432         if (!xfs_kset) {
2433                 error = -ENOMEM;
2434                 goto out_debugfs_unregister;
2435         }
2436
2437         xfsstats.xs_kobj.kobject.kset = xfs_kset;
2438
2439         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
2440         if (!xfsstats.xs_stats) {
2441                 error = -ENOMEM;
2442                 goto out_kset_unregister;
2443         }
2444
2445         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
2446                                "stats");
2447         if (error)
2448                 goto out_free_stats;
2449
2450         error = xchk_global_stats_setup(xfs_debugfs);
2451         if (error)
2452                 goto out_remove_stats_kobj;
2453
2454 #ifdef DEBUG
2455         xfs_dbg_kobj.kobject.kset = xfs_kset;
2456         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
2457         if (error)
2458                 goto out_remove_scrub_stats;
2459 #endif
2460
2461         error = xfs_qm_init();
2462         if (error)
2463                 goto out_remove_dbg_kobj;
2464
2465         error = register_filesystem(&xfs_fs_type);
2466         if (error)
2467                 goto out_qm_exit;
2468         return 0;
2469
2470  out_qm_exit:
2471         xfs_qm_exit();
2472  out_remove_dbg_kobj:
2473 #ifdef DEBUG
2474         xfs_sysfs_del(&xfs_dbg_kobj);
2475  out_remove_scrub_stats:
2476 #endif
2477         xchk_global_stats_teardown();
2478  out_remove_stats_kobj:
2479         xfs_sysfs_del(&xfsstats.xs_kobj);
2480  out_free_stats:
2481         free_percpu(xfsstats.xs_stats);
2482  out_kset_unregister:
2483         kset_unregister(xfs_kset);
2484  out_debugfs_unregister:
2485         debugfs_remove(xfs_debugfs);
2486         xfs_sysctl_unregister();
2487  out_cleanup_procfs:
2488         xfs_cleanup_procfs();
2489  out_mru_cache_uninit:
2490         xfs_mru_cache_uninit();
2491  out_destroy_wq:
2492         xfs_destroy_workqueues();
2493  out_destroy_caches:
2494         xfs_destroy_caches();
2495  out:
2496         return error;
2497 }
2498
2499 STATIC void __exit
2500 exit_xfs_fs(void)
2501 {
2502         xfs_qm_exit();
2503         unregister_filesystem(&xfs_fs_type);
2504 #ifdef DEBUG
2505         xfs_sysfs_del(&xfs_dbg_kobj);
2506 #endif
2507         xchk_global_stats_teardown();
2508         xfs_sysfs_del(&xfsstats.xs_kobj);
2509         free_percpu(xfsstats.xs_stats);
2510         kset_unregister(xfs_kset);
2511         debugfs_remove(xfs_debugfs);
2512         xfs_sysctl_unregister();
2513         xfs_cleanup_procfs();
2514         xfs_mru_cache_uninit();
2515         xfs_destroy_workqueues();
2516         xfs_destroy_caches();
2517         xfs_uuid_table_free();
2518 }
2519
2520 module_init(init_xfs_fs);
2521 module_exit(exit_xfs_fs);
2522
2523 MODULE_AUTHOR("Silicon Graphics, Inc.");
2524 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2525 MODULE_LICENSE("GPL");
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