GNU Linux-libre 4.9.337-gnu1
[releases.git] / fs / xfs / xfs_super.c
1 /*
2  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3  * All Rights Reserved.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License as
7  * published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it would be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write the Free Software Foundation,
16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
17  */
18
19 #include "xfs.h"
20 #include "xfs_shared.h"
21 #include "xfs_format.h"
22 #include "xfs_log_format.h"
23 #include "xfs_trans_resv.h"
24 #include "xfs_sb.h"
25 #include "xfs_mount.h"
26 #include "xfs_da_format.h"
27 #include "xfs_inode.h"
28 #include "xfs_btree.h"
29 #include "xfs_bmap.h"
30 #include "xfs_alloc.h"
31 #include "xfs_error.h"
32 #include "xfs_fsops.h"
33 #include "xfs_trans.h"
34 #include "xfs_buf_item.h"
35 #include "xfs_log.h"
36 #include "xfs_log_priv.h"
37 #include "xfs_da_btree.h"
38 #include "xfs_dir2.h"
39 #include "xfs_extfree_item.h"
40 #include "xfs_mru_cache.h"
41 #include "xfs_inode_item.h"
42 #include "xfs_icache.h"
43 #include "xfs_trace.h"
44 #include "xfs_icreate_item.h"
45 #include "xfs_filestream.h"
46 #include "xfs_quota.h"
47 #include "xfs_sysfs.h"
48 #include "xfs_ondisk.h"
49 #include "xfs_rmap_item.h"
50 #include "xfs_refcount_item.h"
51 #include "xfs_bmap_item.h"
52 #include "xfs_reflink.h"
53
54 #include <linux/namei.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
57 #include <linux/mount.h>
58 #include <linux/mempool.h>
59 #include <linux/writeback.h>
60 #include <linux/kthread.h>
61 #include <linux/freezer.h>
62 #include <linux/parser.h>
63
64 static const struct super_operations xfs_super_operations;
65 struct bio_set *xfs_ioend_bioset;
66
67 static struct kset *xfs_kset;           /* top-level xfs sysfs dir */
68 #ifdef DEBUG
69 static struct xfs_kobj xfs_dbg_kobj;    /* global debug sysfs attrs */
70 #endif
71
72 /*
73  * Table driven mount option parser.
74  */
75 enum {
76         Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev, Opt_biosize,
77         Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
78         Opt_mtpt, Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
79         Opt_allocsize, Opt_norecovery, Opt_barrier, Opt_nobarrier,
80         Opt_inode64, Opt_inode32, Opt_ikeep, Opt_noikeep,
81         Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2, Opt_filestreams,
82         Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota, Opt_prjquota,
83         Opt_uquota, Opt_gquota, Opt_pquota,
84         Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
85         Opt_discard, Opt_nodiscard, Opt_dax, Opt_err,
86 };
87
88 static const match_table_t tokens = {
89         {Opt_logbufs,   "logbufs=%u"},  /* number of XFS log buffers */
90         {Opt_logbsize,  "logbsize=%s"}, /* size of XFS log buffers */
91         {Opt_logdev,    "logdev=%s"},   /* log device */
92         {Opt_rtdev,     "rtdev=%s"},    /* realtime I/O device */
93         {Opt_biosize,   "biosize=%u"},  /* log2 of preferred buffered io size */
94         {Opt_wsync,     "wsync"},       /* safe-mode nfs compatible mount */
95         {Opt_noalign,   "noalign"},     /* turn off stripe alignment */
96         {Opt_swalloc,   "swalloc"},     /* turn on stripe width allocation */
97         {Opt_sunit,     "sunit=%u"},    /* data volume stripe unit */
98         {Opt_swidth,    "swidth=%u"},   /* data volume stripe width */
99         {Opt_nouuid,    "nouuid"},      /* ignore filesystem UUID */
100         {Opt_mtpt,      "mtpt"},        /* filesystem mount point */
101         {Opt_grpid,     "grpid"},       /* group-ID from parent directory */
102         {Opt_nogrpid,   "nogrpid"},     /* group-ID from current process */
103         {Opt_bsdgroups, "bsdgroups"},   /* group-ID from parent directory */
104         {Opt_sysvgroups,"sysvgroups"},  /* group-ID from current process */
105         {Opt_allocsize, "allocsize=%s"},/* preferred allocation size */
106         {Opt_norecovery,"norecovery"},  /* don't run XFS recovery */
107         {Opt_barrier,   "barrier"},     /* use writer barriers for log write and
108                                          * unwritten extent conversion */
109         {Opt_nobarrier, "nobarrier"},   /* .. disable */
110         {Opt_inode64,   "inode64"},     /* inodes can be allocated anywhere */
111         {Opt_inode32,   "inode32"},     /* inode allocation limited to
112                                          * XFS_MAXINUMBER_32 */
113         {Opt_ikeep,     "ikeep"},       /* do not free empty inode clusters */
114         {Opt_noikeep,   "noikeep"},     /* free empty inode clusters */
115         {Opt_largeio,   "largeio"},     /* report large I/O sizes in stat() */
116         {Opt_nolargeio, "nolargeio"},   /* do not report large I/O sizes
117                                          * in stat(). */
118         {Opt_attr2,     "attr2"},       /* do use attr2 attribute format */
119         {Opt_noattr2,   "noattr2"},     /* do not use attr2 attribute format */
120         {Opt_filestreams,"filestreams"},/* use filestreams allocator */
121         {Opt_quota,     "quota"},       /* disk quotas (user) */
122         {Opt_noquota,   "noquota"},     /* no quotas */
123         {Opt_usrquota,  "usrquota"},    /* user quota enabled */
124         {Opt_grpquota,  "grpquota"},    /* group quota enabled */
125         {Opt_prjquota,  "prjquota"},    /* project quota enabled */
126         {Opt_uquota,    "uquota"},      /* user quota (IRIX variant) */
127         {Opt_gquota,    "gquota"},      /* group quota (IRIX variant) */
128         {Opt_pquota,    "pquota"},      /* project quota (IRIX variant) */
129         {Opt_uqnoenforce,"uqnoenforce"},/* user quota limit enforcement */
130         {Opt_gqnoenforce,"gqnoenforce"},/* group quota limit enforcement */
131         {Opt_pqnoenforce,"pqnoenforce"},/* project quota limit enforcement */
132         {Opt_qnoenforce, "qnoenforce"}, /* same as uqnoenforce */
133         {Opt_discard,   "discard"},     /* Discard unused blocks */
134         {Opt_nodiscard, "nodiscard"},   /* Do not discard unused blocks */
135
136         {Opt_dax,       "dax"},         /* Enable direct access to bdev pages */
137         {Opt_err,       NULL},
138 };
139
140
141 STATIC int
142 suffix_kstrtoint(const substring_t *s, unsigned int base, int *res)
143 {
144         int     last, shift_left_factor = 0, _res;
145         char    *value;
146         int     ret = 0;
147
148         value = match_strdup(s);
149         if (!value)
150                 return -ENOMEM;
151
152         last = strlen(value) - 1;
153         if (value[last] == 'K' || value[last] == 'k') {
154                 shift_left_factor = 10;
155                 value[last] = '\0';
156         }
157         if (value[last] == 'M' || value[last] == 'm') {
158                 shift_left_factor = 20;
159                 value[last] = '\0';
160         }
161         if (value[last] == 'G' || value[last] == 'g') {
162                 shift_left_factor = 30;
163                 value[last] = '\0';
164         }
165
166         if (kstrtoint(value, base, &_res))
167                 ret = -EINVAL;
168         kfree(value);
169         *res = _res << shift_left_factor;
170         return ret;
171 }
172
173 /*
174  * This function fills in xfs_mount_t fields based on mount args.
175  * Note: the superblock has _not_ yet been read in.
176  *
177  * Note that this function leaks the various device name allocations on
178  * failure.  The caller takes care of them.
179  *
180  * *sb is const because this is also used to test options on the remount
181  * path, and we don't want this to have any side effects at remount time.
182  * Today this function does not change *sb, but just to future-proof...
183  */
184 STATIC int
185 xfs_parseargs(
186         struct xfs_mount        *mp,
187         char                    *options)
188 {
189         const struct super_block *sb = mp->m_super;
190         char                    *p;
191         substring_t             args[MAX_OPT_ARGS];
192         int                     dsunit = 0;
193         int                     dswidth = 0;
194         int                     iosize = 0;
195         __uint8_t               iosizelog = 0;
196
197         /*
198          * set up the mount name first so all the errors will refer to the
199          * correct device.
200          */
201         mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
202         if (!mp->m_fsname)
203                 return -ENOMEM;
204         mp->m_fsname_len = strlen(mp->m_fsname) + 1;
205
206         /*
207          * Copy binary VFS mount flags we are interested in.
208          */
209         if (sb->s_flags & MS_RDONLY)
210                 mp->m_flags |= XFS_MOUNT_RDONLY;
211         if (sb->s_flags & MS_DIRSYNC)
212                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
213         if (sb->s_flags & MS_SYNCHRONOUS)
214                 mp->m_flags |= XFS_MOUNT_WSYNC;
215
216         /*
217          * Set some default flags that could be cleared by the mount option
218          * parsing.
219          */
220         mp->m_flags |= XFS_MOUNT_BARRIER;
221         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
222
223         /*
224          * These can be overridden by the mount option parsing.
225          */
226         mp->m_logbufs = -1;
227         mp->m_logbsize = -1;
228
229         if (!options)
230                 goto done;
231
232         while ((p = strsep(&options, ",")) != NULL) {
233                 int             token;
234
235                 if (!*p)
236                         continue;
237
238                 token = match_token(p, tokens, args);
239                 switch (token) {
240                 case Opt_logbufs:
241                         if (match_int(args, &mp->m_logbufs))
242                                 return -EINVAL;
243                         break;
244                 case Opt_logbsize:
245                         if (suffix_kstrtoint(args, 10, &mp->m_logbsize))
246                                 return -EINVAL;
247                         break;
248                 case Opt_logdev:
249                         mp->m_logname = match_strdup(args);
250                         if (!mp->m_logname)
251                                 return -ENOMEM;
252                         break;
253                 case Opt_mtpt:
254                         xfs_warn(mp, "%s option not allowed on this system", p);
255                         return -EINVAL;
256                 case Opt_rtdev:
257                         mp->m_rtname = match_strdup(args);
258                         if (!mp->m_rtname)
259                                 return -ENOMEM;
260                         break;
261                 case Opt_allocsize:
262                 case Opt_biosize:
263                         if (suffix_kstrtoint(args, 10, &iosize))
264                                 return -EINVAL;
265                         iosizelog = ffs(iosize) - 1;
266                         break;
267                 case Opt_grpid:
268                 case Opt_bsdgroups:
269                         mp->m_flags |= XFS_MOUNT_GRPID;
270                         break;
271                 case Opt_nogrpid:
272                 case Opt_sysvgroups:
273                         mp->m_flags &= ~XFS_MOUNT_GRPID;
274                         break;
275                 case Opt_wsync:
276                         mp->m_flags |= XFS_MOUNT_WSYNC;
277                         break;
278                 case Opt_norecovery:
279                         mp->m_flags |= XFS_MOUNT_NORECOVERY;
280                         break;
281                 case Opt_noalign:
282                         mp->m_flags |= XFS_MOUNT_NOALIGN;
283                         break;
284                 case Opt_swalloc:
285                         mp->m_flags |= XFS_MOUNT_SWALLOC;
286                         break;
287                 case Opt_sunit:
288                         if (match_int(args, &dsunit))
289                                 return -EINVAL;
290                         break;
291                 case Opt_swidth:
292                         if (match_int(args, &dswidth))
293                                 return -EINVAL;
294                         break;
295                 case Opt_inode32:
296                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
297                         break;
298                 case Opt_inode64:
299                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
300                         break;
301                 case Opt_nouuid:
302                         mp->m_flags |= XFS_MOUNT_NOUUID;
303                         break;
304                 case Opt_barrier:
305                         mp->m_flags |= XFS_MOUNT_BARRIER;
306                         break;
307                 case Opt_nobarrier:
308                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
309                         break;
310                 case Opt_ikeep:
311                         mp->m_flags |= XFS_MOUNT_IKEEP;
312                         break;
313                 case Opt_noikeep:
314                         mp->m_flags &= ~XFS_MOUNT_IKEEP;
315                         break;
316                 case Opt_largeio:
317                         mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
318                         break;
319                 case Opt_nolargeio:
320                         mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
321                         break;
322                 case Opt_attr2:
323                         mp->m_flags |= XFS_MOUNT_ATTR2;
324                         break;
325                 case Opt_noattr2:
326                         mp->m_flags &= ~XFS_MOUNT_ATTR2;
327                         mp->m_flags |= XFS_MOUNT_NOATTR2;
328                         break;
329                 case Opt_filestreams:
330                         mp->m_flags |= XFS_MOUNT_FILESTREAMS;
331                         break;
332                 case Opt_noquota:
333                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
334                         mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
335                         mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
336                         break;
337                 case Opt_quota:
338                 case Opt_uquota:
339                 case Opt_usrquota:
340                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
341                                          XFS_UQUOTA_ENFD);
342                         break;
343                 case Opt_qnoenforce:
344                 case Opt_uqnoenforce:
345                         mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
346                         mp->m_qflags &= ~XFS_UQUOTA_ENFD;
347                         break;
348                 case Opt_pquota:
349                 case Opt_prjquota:
350                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
351                                          XFS_PQUOTA_ENFD);
352                         break;
353                 case Opt_pqnoenforce:
354                         mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
355                         mp->m_qflags &= ~XFS_PQUOTA_ENFD;
356                         break;
357                 case Opt_gquota:
358                 case Opt_grpquota:
359                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
360                                          XFS_GQUOTA_ENFD);
361                         break;
362                 case Opt_gqnoenforce:
363                         mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
364                         mp->m_qflags &= ~XFS_GQUOTA_ENFD;
365                         break;
366                 case Opt_discard:
367                         mp->m_flags |= XFS_MOUNT_DISCARD;
368                         break;
369                 case Opt_nodiscard:
370                         mp->m_flags &= ~XFS_MOUNT_DISCARD;
371                         break;
372 #ifdef CONFIG_FS_DAX
373                 case Opt_dax:
374                         mp->m_flags |= XFS_MOUNT_DAX;
375                         break;
376 #endif
377                 default:
378                         xfs_warn(mp, "unknown mount option [%s].", p);
379                         return -EINVAL;
380                 }
381         }
382
383         /*
384          * no recovery flag requires a read-only mount
385          */
386         if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
387             !(mp->m_flags & XFS_MOUNT_RDONLY)) {
388                 xfs_warn(mp, "no-recovery mounts must be read-only.");
389                 return -EINVAL;
390         }
391
392         if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
393                 xfs_warn(mp,
394         "sunit and swidth options incompatible with the noalign option");
395                 return -EINVAL;
396         }
397
398 #ifndef CONFIG_XFS_QUOTA
399         if (XFS_IS_QUOTA_RUNNING(mp)) {
400                 xfs_warn(mp, "quota support not available in this kernel.");
401                 return -EINVAL;
402         }
403 #endif
404
405         if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
406                 xfs_warn(mp, "sunit and swidth must be specified together");
407                 return -EINVAL;
408         }
409
410         if (dsunit && (dswidth % dsunit != 0)) {
411                 xfs_warn(mp,
412         "stripe width (%d) must be a multiple of the stripe unit (%d)",
413                         dswidth, dsunit);
414                 return -EINVAL;
415         }
416
417 done:
418         if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
419                 /*
420                  * At this point the superblock has not been read
421                  * in, therefore we do not know the block size.
422                  * Before the mount call ends we will convert
423                  * these to FSBs.
424                  */
425                 mp->m_dalign = dsunit;
426                 mp->m_swidth = dswidth;
427         }
428
429         if (mp->m_logbufs != -1 &&
430             mp->m_logbufs != 0 &&
431             (mp->m_logbufs < XLOG_MIN_ICLOGS ||
432              mp->m_logbufs > XLOG_MAX_ICLOGS)) {
433                 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
434                         mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
435                 return -EINVAL;
436         }
437         if (mp->m_logbsize != -1 &&
438             mp->m_logbsize !=  0 &&
439             (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
440              mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
441              !is_power_of_2(mp->m_logbsize))) {
442                 xfs_warn(mp,
443                         "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
444                         mp->m_logbsize);
445                 return -EINVAL;
446         }
447
448         if (iosizelog) {
449                 if (iosizelog > XFS_MAX_IO_LOG ||
450                     iosizelog < XFS_MIN_IO_LOG) {
451                         xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
452                                 iosizelog, XFS_MIN_IO_LOG,
453                                 XFS_MAX_IO_LOG);
454                         return -EINVAL;
455                 }
456
457                 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
458                 mp->m_readio_log = iosizelog;
459                 mp->m_writeio_log = iosizelog;
460         }
461
462         return 0;
463 }
464
465 struct proc_xfs_info {
466         uint64_t        flag;
467         char            *str;
468 };
469
470 STATIC int
471 xfs_showargs(
472         struct xfs_mount        *mp,
473         struct seq_file         *m)
474 {
475         static struct proc_xfs_info xfs_info_set[] = {
476                 /* the few simple ones we can get from the mount struct */
477                 { XFS_MOUNT_IKEEP,              ",ikeep" },
478                 { XFS_MOUNT_WSYNC,              ",wsync" },
479                 { XFS_MOUNT_NOALIGN,            ",noalign" },
480                 { XFS_MOUNT_SWALLOC,            ",swalloc" },
481                 { XFS_MOUNT_NOUUID,             ",nouuid" },
482                 { XFS_MOUNT_NORECOVERY,         ",norecovery" },
483                 { XFS_MOUNT_ATTR2,              ",attr2" },
484                 { XFS_MOUNT_FILESTREAMS,        ",filestreams" },
485                 { XFS_MOUNT_GRPID,              ",grpid" },
486                 { XFS_MOUNT_DISCARD,            ",discard" },
487                 { XFS_MOUNT_SMALL_INUMS,        ",inode32" },
488                 { XFS_MOUNT_DAX,                ",dax" },
489                 { 0, NULL }
490         };
491         static struct proc_xfs_info xfs_info_unset[] = {
492                 /* the few simple ones we can get from the mount struct */
493                 { XFS_MOUNT_COMPAT_IOSIZE,      ",largeio" },
494                 { XFS_MOUNT_BARRIER,            ",nobarrier" },
495                 { XFS_MOUNT_SMALL_INUMS,        ",inode64" },
496                 { 0, NULL }
497         };
498         struct proc_xfs_info    *xfs_infop;
499
500         for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
501                 if (mp->m_flags & xfs_infop->flag)
502                         seq_puts(m, xfs_infop->str);
503         }
504         for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
505                 if (!(mp->m_flags & xfs_infop->flag))
506                         seq_puts(m, xfs_infop->str);
507         }
508
509         if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
510                 seq_printf(m, ",allocsize=%dk",
511                                 (int)(1 << mp->m_writeio_log) >> 10);
512
513         if (mp->m_logbufs > 0)
514                 seq_printf(m, ",logbufs=%d", mp->m_logbufs);
515         if (mp->m_logbsize > 0)
516                 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
517
518         if (mp->m_logname)
519                 seq_show_option(m, "logdev", mp->m_logname);
520         if (mp->m_rtname)
521                 seq_show_option(m, "rtdev", mp->m_rtname);
522
523         if (mp->m_dalign > 0)
524                 seq_printf(m, ",sunit=%d",
525                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
526         if (mp->m_swidth > 0)
527                 seq_printf(m, ",swidth=%d",
528                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
529
530         if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
531                 seq_puts(m, ",usrquota");
532         else if (mp->m_qflags & XFS_UQUOTA_ACCT)
533                 seq_puts(m, ",uqnoenforce");
534
535         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
536                 if (mp->m_qflags & XFS_PQUOTA_ENFD)
537                         seq_puts(m, ",prjquota");
538                 else
539                         seq_puts(m, ",pqnoenforce");
540         }
541         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
542                 if (mp->m_qflags & XFS_GQUOTA_ENFD)
543                         seq_puts(m, ",grpquota");
544                 else
545                         seq_puts(m, ",gqnoenforce");
546         }
547
548         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
549                 seq_puts(m, ",noquota");
550
551         return 0;
552 }
553 static __uint64_t
554 xfs_max_file_offset(
555         unsigned int            blockshift)
556 {
557         unsigned int            pagefactor = 1;
558         unsigned int            bitshift = BITS_PER_LONG - 1;
559
560         /* Figure out maximum filesize, on Linux this can depend on
561          * the filesystem blocksize (on 32 bit platforms).
562          * __block_write_begin does this in an [unsigned] long...
563          *      page->index << (PAGE_SHIFT - bbits)
564          * So, for page sized blocks (4K on 32 bit platforms),
565          * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
566          *      (((u64)PAGE_SIZE << (BITS_PER_LONG-1))-1)
567          * but for smaller blocksizes it is less (bbits = log2 bsize).
568          * Note1: get_block_t takes a long (implicit cast from above)
569          * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
570          * can optionally convert the [unsigned] long from above into
571          * an [unsigned] long long.
572          */
573
574 #if BITS_PER_LONG == 32
575 # if defined(CONFIG_LBDAF)
576         ASSERT(sizeof(sector_t) == 8);
577         pagefactor = PAGE_SIZE;
578         bitshift = BITS_PER_LONG;
579 # else
580         pagefactor = PAGE_SIZE >> (PAGE_SHIFT - blockshift);
581 # endif
582 #endif
583
584         return (((__uint64_t)pagefactor) << bitshift) - 1;
585 }
586
587 /*
588  * Set parameters for inode allocation heuristics, taking into account
589  * filesystem size and inode32/inode64 mount options; i.e. specifically
590  * whether or not XFS_MOUNT_SMALL_INUMS is set.
591  *
592  * Inode allocation patterns are altered only if inode32 is requested
593  * (XFS_MOUNT_SMALL_INUMS), and the filesystem is sufficiently large.
594  * If altered, XFS_MOUNT_32BITINODES is set as well.
595  *
596  * An agcount independent of that in the mount structure is provided
597  * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
598  * to the potentially higher ag count.
599  *
600  * Returns the maximum AG index which may contain inodes.
601  */
602 xfs_agnumber_t
603 xfs_set_inode_alloc(
604         struct xfs_mount *mp,
605         xfs_agnumber_t  agcount)
606 {
607         xfs_agnumber_t  index;
608         xfs_agnumber_t  maxagi = 0;
609         xfs_sb_t        *sbp = &mp->m_sb;
610         xfs_agnumber_t  max_metadata;
611         xfs_agino_t     agino;
612         xfs_ino_t       ino;
613
614         /*
615          * Calculate how much should be reserved for inodes to meet
616          * the max inode percentage.  Used only for inode32.
617          */
618         if (mp->m_maxicount) {
619                 __uint64_t      icount;
620
621                 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
622                 do_div(icount, 100);
623                 icount += sbp->sb_agblocks - 1;
624                 do_div(icount, sbp->sb_agblocks);
625                 max_metadata = icount;
626         } else {
627                 max_metadata = agcount;
628         }
629
630         /* Get the last possible inode in the filesystem */
631         agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
632         ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
633
634         /*
635          * If user asked for no more than 32-bit inodes, and the fs is
636          * sufficiently large, set XFS_MOUNT_32BITINODES if we must alter
637          * the allocator to accommodate the request.
638          */
639         if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32)
640                 mp->m_flags |= XFS_MOUNT_32BITINODES;
641         else
642                 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
643
644         for (index = 0; index < agcount; index++) {
645                 struct xfs_perag        *pag;
646
647                 ino = XFS_AGINO_TO_INO(mp, index, agino);
648
649                 pag = xfs_perag_get(mp, index);
650
651                 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
652                         if (ino > XFS_MAXINUMBER_32) {
653                                 pag->pagi_inodeok = 0;
654                                 pag->pagf_metadata = 0;
655                         } else {
656                                 pag->pagi_inodeok = 1;
657                                 maxagi++;
658                                 if (index < max_metadata)
659                                         pag->pagf_metadata = 1;
660                                 else
661                                         pag->pagf_metadata = 0;
662                         }
663                 } else {
664                         pag->pagi_inodeok = 1;
665                         pag->pagf_metadata = 0;
666                 }
667
668                 xfs_perag_put(pag);
669         }
670
671         return (mp->m_flags & XFS_MOUNT_32BITINODES) ? maxagi : agcount;
672 }
673
674 STATIC int
675 xfs_blkdev_get(
676         xfs_mount_t             *mp,
677         const char              *name,
678         struct block_device     **bdevp)
679 {
680         int                     error = 0;
681
682         *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
683                                     mp);
684         if (IS_ERR(*bdevp)) {
685                 error = PTR_ERR(*bdevp);
686                 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
687         }
688
689         return error;
690 }
691
692 STATIC void
693 xfs_blkdev_put(
694         struct block_device     *bdev)
695 {
696         if (bdev)
697                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
698 }
699
700 void
701 xfs_blkdev_issue_flush(
702         xfs_buftarg_t           *buftarg)
703 {
704         blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
705 }
706
707 STATIC void
708 xfs_close_devices(
709         struct xfs_mount        *mp)
710 {
711         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
712                 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
713                 xfs_free_buftarg(mp, mp->m_logdev_targp);
714                 xfs_blkdev_put(logdev);
715         }
716         if (mp->m_rtdev_targp) {
717                 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
718                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
719                 xfs_blkdev_put(rtdev);
720         }
721         xfs_free_buftarg(mp, mp->m_ddev_targp);
722 }
723
724 /*
725  * The file system configurations are:
726  *      (1) device (partition) with data and internal log
727  *      (2) logical volume with data and log subvolumes.
728  *      (3) logical volume with data, log, and realtime subvolumes.
729  *
730  * We only have to handle opening the log and realtime volumes here if
731  * they are present.  The data subvolume has already been opened by
732  * get_sb_bdev() and is stored in sb->s_bdev.
733  */
734 STATIC int
735 xfs_open_devices(
736         struct xfs_mount        *mp)
737 {
738         struct block_device     *ddev = mp->m_super->s_bdev;
739         struct block_device     *logdev = NULL, *rtdev = NULL;
740         int                     error;
741
742         /*
743          * Open real time and log devices - order is important.
744          */
745         if (mp->m_logname) {
746                 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
747                 if (error)
748                         goto out;
749         }
750
751         if (mp->m_rtname) {
752                 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
753                 if (error)
754                         goto out_close_logdev;
755
756                 if (rtdev == ddev || rtdev == logdev) {
757                         xfs_warn(mp,
758         "Cannot mount filesystem with identical rtdev and ddev/logdev.");
759                         error = -EINVAL;
760                         goto out_close_rtdev;
761                 }
762         }
763
764         /*
765          * Setup xfs_mount buffer target pointers
766          */
767         error = -ENOMEM;
768         mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev);
769         if (!mp->m_ddev_targp)
770                 goto out_close_rtdev;
771
772         if (rtdev) {
773                 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev);
774                 if (!mp->m_rtdev_targp)
775                         goto out_free_ddev_targ;
776         }
777
778         if (logdev && logdev != ddev) {
779                 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev);
780                 if (!mp->m_logdev_targp)
781                         goto out_free_rtdev_targ;
782         } else {
783                 mp->m_logdev_targp = mp->m_ddev_targp;
784         }
785
786         return 0;
787
788  out_free_rtdev_targ:
789         if (mp->m_rtdev_targp)
790                 xfs_free_buftarg(mp, mp->m_rtdev_targp);
791  out_free_ddev_targ:
792         xfs_free_buftarg(mp, mp->m_ddev_targp);
793  out_close_rtdev:
794         xfs_blkdev_put(rtdev);
795  out_close_logdev:
796         if (logdev && logdev != ddev)
797                 xfs_blkdev_put(logdev);
798  out:
799         return error;
800 }
801
802 /*
803  * Setup xfs_mount buffer target pointers based on superblock
804  */
805 STATIC int
806 xfs_setup_devices(
807         struct xfs_mount        *mp)
808 {
809         int                     error;
810
811         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
812         if (error)
813                 return error;
814
815         if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
816                 unsigned int    log_sector_size = BBSIZE;
817
818                 if (xfs_sb_version_hassector(&mp->m_sb))
819                         log_sector_size = mp->m_sb.sb_logsectsize;
820                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
821                                             log_sector_size);
822                 if (error)
823                         return error;
824         }
825         if (mp->m_rtdev_targp) {
826                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
827                                             mp->m_sb.sb_sectsize);
828                 if (error)
829                         return error;
830         }
831
832         return 0;
833 }
834
835 STATIC int
836 xfs_init_mount_workqueues(
837         struct xfs_mount        *mp)
838 {
839         mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
840                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_fsname);
841         if (!mp->m_buf_workqueue)
842                 goto out;
843
844         mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
845                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
846         if (!mp->m_data_workqueue)
847                 goto out_destroy_buf;
848
849         mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
850                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
851         if (!mp->m_unwritten_workqueue)
852                 goto out_destroy_data_iodone_queue;
853
854         mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
855                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
856         if (!mp->m_cil_workqueue)
857                 goto out_destroy_unwritten;
858
859         mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
860                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
861         if (!mp->m_reclaim_workqueue)
862                 goto out_destroy_cil;
863
864         mp->m_log_workqueue = alloc_workqueue("xfs-log/%s",
865                         WQ_MEM_RECLAIM|WQ_FREEZABLE|WQ_HIGHPRI, 0,
866                         mp->m_fsname);
867         if (!mp->m_log_workqueue)
868                 goto out_destroy_reclaim;
869
870         mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
871                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
872         if (!mp->m_eofblocks_workqueue)
873                 goto out_destroy_log;
874
875         mp->m_sync_workqueue = alloc_workqueue("xfs-sync/%s", WQ_FREEZABLE, 0,
876                                                mp->m_fsname);
877         if (!mp->m_sync_workqueue)
878                 goto out_destroy_eofb;
879
880         return 0;
881
882 out_destroy_eofb:
883         destroy_workqueue(mp->m_eofblocks_workqueue);
884 out_destroy_log:
885         destroy_workqueue(mp->m_log_workqueue);
886 out_destroy_reclaim:
887         destroy_workqueue(mp->m_reclaim_workqueue);
888 out_destroy_cil:
889         destroy_workqueue(mp->m_cil_workqueue);
890 out_destroy_unwritten:
891         destroy_workqueue(mp->m_unwritten_workqueue);
892 out_destroy_data_iodone_queue:
893         destroy_workqueue(mp->m_data_workqueue);
894 out_destroy_buf:
895         destroy_workqueue(mp->m_buf_workqueue);
896 out:
897         return -ENOMEM;
898 }
899
900 STATIC void
901 xfs_destroy_mount_workqueues(
902         struct xfs_mount        *mp)
903 {
904         destroy_workqueue(mp->m_sync_workqueue);
905         destroy_workqueue(mp->m_eofblocks_workqueue);
906         destroy_workqueue(mp->m_log_workqueue);
907         destroy_workqueue(mp->m_reclaim_workqueue);
908         destroy_workqueue(mp->m_cil_workqueue);
909         destroy_workqueue(mp->m_data_workqueue);
910         destroy_workqueue(mp->m_unwritten_workqueue);
911         destroy_workqueue(mp->m_buf_workqueue);
912 }
913
914 /*
915  * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
916  * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
917  * for IO to complete so that we effectively throttle multiple callers to the
918  * rate at which IO is completing.
919  */
920 void
921 xfs_flush_inodes(
922         struct xfs_mount        *mp)
923 {
924         struct super_block      *sb = mp->m_super;
925
926         if (down_read_trylock(&sb->s_umount)) {
927                 sync_inodes_sb(sb);
928                 up_read(&sb->s_umount);
929         }
930 }
931
932 /* Catch misguided souls that try to use this interface on XFS */
933 STATIC struct inode *
934 xfs_fs_alloc_inode(
935         struct super_block      *sb)
936 {
937         BUG();
938         return NULL;
939 }
940
941 /*
942  * Now that the generic code is guaranteed not to be accessing
943  * the linux inode, we can inactivate and reclaim the inode.
944  */
945 STATIC void
946 xfs_fs_destroy_inode(
947         struct inode            *inode)
948 {
949         struct xfs_inode        *ip = XFS_I(inode);
950         int                     error;
951
952         trace_xfs_destroy_inode(ip);
953
954         ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
955         XFS_STATS_INC(ip->i_mount, vn_rele);
956         XFS_STATS_INC(ip->i_mount, vn_remove);
957
958         if (xfs_is_reflink_inode(ip)) {
959                 error = xfs_reflink_cancel_cow_range(ip, 0, NULLFILEOFF, true);
960                 if (error && !XFS_FORCED_SHUTDOWN(ip->i_mount))
961                         xfs_warn(ip->i_mount,
962 "Error %d while evicting CoW blocks for inode %llu.",
963                                         error, ip->i_ino);
964         }
965
966         xfs_inactive(ip);
967
968         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
969         XFS_STATS_INC(ip->i_mount, vn_reclaim);
970
971         /*
972          * We should never get here with one of the reclaim flags already set.
973          */
974         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
975         ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
976
977         /*
978          * We always use background reclaim here because even if the
979          * inode is clean, it still may be under IO and hence we have
980          * to take the flush lock. The background reclaim path handles
981          * this more efficiently than we can here, so simply let background
982          * reclaim tear down all inodes.
983          */
984         xfs_inode_set_reclaim_tag(ip);
985 }
986
987 /*
988  * Slab object creation initialisation for the XFS inode.
989  * This covers only the idempotent fields in the XFS inode;
990  * all other fields need to be initialised on allocation
991  * from the slab. This avoids the need to repeatedly initialise
992  * fields in the xfs inode that left in the initialise state
993  * when freeing the inode.
994  */
995 STATIC void
996 xfs_fs_inode_init_once(
997         void                    *inode)
998 {
999         struct xfs_inode        *ip = inode;
1000
1001         memset(ip, 0, sizeof(struct xfs_inode));
1002
1003         /* vfs inode */
1004         inode_init_once(VFS_I(ip));
1005
1006         /* xfs inode */
1007         atomic_set(&ip->i_pincount, 0);
1008         spin_lock_init(&ip->i_flags_lock);
1009
1010         mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
1011                      "xfsino", ip->i_ino);
1012         mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
1013                      "xfsino", ip->i_ino);
1014 }
1015
1016 /*
1017  * We do an unlocked check for XFS_IDONTCACHE here because we are already
1018  * serialised against cache hits here via the inode->i_lock and igrab() in
1019  * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
1020  * racing with us, and it avoids needing to grab a spinlock here for every inode
1021  * we drop the final reference on.
1022  */
1023 STATIC int
1024 xfs_fs_drop_inode(
1025         struct inode            *inode)
1026 {
1027         struct xfs_inode        *ip = XFS_I(inode);
1028
1029         /*
1030          * If this unlinked inode is in the middle of recovery, don't
1031          * drop the inode just yet; log recovery will take care of
1032          * that.  See the comment for this inode flag.
1033          */
1034         if (ip->i_flags & XFS_IRECOVERY) {
1035                 ASSERT(ip->i_mount->m_log->l_flags & XLOG_RECOVERY_NEEDED);
1036                 return 0;
1037         }
1038
1039         return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1040 }
1041
1042 STATIC void
1043 xfs_free_fsname(
1044         struct xfs_mount        *mp)
1045 {
1046         kfree(mp->m_fsname);
1047         kfree(mp->m_rtname);
1048         kfree(mp->m_logname);
1049 }
1050
1051 STATIC int
1052 xfs_fs_sync_fs(
1053         struct super_block      *sb,
1054         int                     wait)
1055 {
1056         struct xfs_mount        *mp = XFS_M(sb);
1057
1058         /*
1059          * Doing anything during the async pass would be counterproductive.
1060          */
1061         if (!wait)
1062                 return 0;
1063
1064         xfs_log_force(mp, XFS_LOG_SYNC);
1065         if (laptop_mode) {
1066                 /*
1067                  * The disk must be active because we're syncing.
1068                  * We schedule log work now (now that the disk is
1069                  * active) instead of later (when it might not be).
1070                  */
1071                 flush_delayed_work(&mp->m_log->l_work);
1072         }
1073
1074         return 0;
1075 }
1076
1077 STATIC int
1078 xfs_fs_statfs(
1079         struct dentry           *dentry,
1080         struct kstatfs          *statp)
1081 {
1082         struct xfs_mount        *mp = XFS_M(dentry->d_sb);
1083         xfs_sb_t                *sbp = &mp->m_sb;
1084         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
1085         __uint64_t              fakeinos, id;
1086         __uint64_t              icount;
1087         __uint64_t              ifree;
1088         __uint64_t              fdblocks;
1089         xfs_extlen_t            lsize;
1090         __int64_t               ffree;
1091
1092         statp->f_type = XFS_SB_MAGIC;
1093         statp->f_namelen = MAXNAMELEN - 1;
1094
1095         id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1096         statp->f_fsid.val[0] = (u32)id;
1097         statp->f_fsid.val[1] = (u32)(id >> 32);
1098
1099         icount = percpu_counter_sum(&mp->m_icount);
1100         ifree = percpu_counter_sum(&mp->m_ifree);
1101         fdblocks = percpu_counter_sum(&mp->m_fdblocks);
1102
1103         spin_lock(&mp->m_sb_lock);
1104         statp->f_bsize = sbp->sb_blocksize;
1105         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1106         statp->f_blocks = sbp->sb_dblocks - lsize;
1107         spin_unlock(&mp->m_sb_lock);
1108
1109         statp->f_bfree = fdblocks - mp->m_alloc_set_aside;
1110         statp->f_bavail = statp->f_bfree;
1111
1112         fakeinos = statp->f_bfree << sbp->sb_inopblog;
1113         statp->f_files = MIN(icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
1114         if (mp->m_maxicount)
1115                 statp->f_files = min_t(typeof(statp->f_files),
1116                                         statp->f_files,
1117                                         mp->m_maxicount);
1118
1119         /* If sb_icount overshot maxicount, report actual allocation */
1120         statp->f_files = max_t(typeof(statp->f_files),
1121                                         statp->f_files,
1122                                         sbp->sb_icount);
1123
1124         /* make sure statp->f_ffree does not underflow */
1125         ffree = statp->f_files - (icount - ifree);
1126         statp->f_ffree = max_t(__int64_t, ffree, 0);
1127
1128
1129         if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1130             ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1131                               (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1132                 xfs_qm_statvfs(ip, statp);
1133         return 0;
1134 }
1135
1136 STATIC void
1137 xfs_save_resvblks(struct xfs_mount *mp)
1138 {
1139         __uint64_t resblks = 0;
1140
1141         mp->m_resblks_save = mp->m_resblks;
1142         xfs_reserve_blocks(mp, &resblks, NULL);
1143 }
1144
1145 STATIC void
1146 xfs_restore_resvblks(struct xfs_mount *mp)
1147 {
1148         __uint64_t resblks;
1149
1150         if (mp->m_resblks_save) {
1151                 resblks = mp->m_resblks_save;
1152                 mp->m_resblks_save = 0;
1153         } else
1154                 resblks = xfs_default_resblks(mp);
1155
1156         xfs_reserve_blocks(mp, &resblks, NULL);
1157 }
1158
1159 /*
1160  * Trigger writeback of all the dirty metadata in the file system.
1161  *
1162  * This ensures that the metadata is written to their location on disk rather
1163  * than just existing in transactions in the log. This means after a quiesce
1164  * there is no log replay required to write the inodes to disk - this is the
1165  * primary difference between a sync and a quiesce.
1166  *
1167  * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1168  * it is started again when appropriate.
1169  */
1170 void
1171 xfs_quiesce_attr(
1172         struct xfs_mount        *mp)
1173 {
1174         int     error = 0;
1175
1176         /* wait for all modifications to complete */
1177         while (atomic_read(&mp->m_active_trans) > 0)
1178                 delay(100);
1179
1180         /* force the log to unpin objects from the now complete transactions */
1181         xfs_log_force(mp, XFS_LOG_SYNC);
1182
1183         /* reclaim inodes to do any IO before the freeze completes */
1184         xfs_reclaim_inodes(mp, 0);
1185         xfs_reclaim_inodes(mp, SYNC_WAIT);
1186
1187         /* Push the superblock and write an unmount record */
1188         error = xfs_log_sbcount(mp);
1189         if (error)
1190                 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1191                                 "Frozen image may not be consistent.");
1192         /*
1193          * Just warn here till VFS can correctly support
1194          * read-only remount without racing.
1195          */
1196         WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1197
1198         xfs_log_quiesce(mp);
1199 }
1200
1201 STATIC int
1202 xfs_test_remount_options(
1203         struct super_block      *sb,
1204         struct xfs_mount        *mp,
1205         char                    *options)
1206 {
1207         int                     error = 0;
1208         struct xfs_mount        *tmp_mp;
1209
1210         tmp_mp = kmem_zalloc(sizeof(*tmp_mp), KM_MAYFAIL);
1211         if (!tmp_mp)
1212                 return -ENOMEM;
1213
1214         tmp_mp->m_super = sb;
1215         error = xfs_parseargs(tmp_mp, options);
1216         xfs_free_fsname(tmp_mp);
1217         kmem_free(tmp_mp);
1218
1219         return error;
1220 }
1221
1222 STATIC int
1223 xfs_fs_remount(
1224         struct super_block      *sb,
1225         int                     *flags,
1226         char                    *options)
1227 {
1228         struct xfs_mount        *mp = XFS_M(sb);
1229         xfs_sb_t                *sbp = &mp->m_sb;
1230         substring_t             args[MAX_OPT_ARGS];
1231         char                    *p;
1232         int                     error;
1233
1234         /* First, check for complete junk; i.e. invalid options */
1235         error = xfs_test_remount_options(sb, mp, options);
1236         if (error)
1237                 return error;
1238
1239         sync_filesystem(sb);
1240         while ((p = strsep(&options, ",")) != NULL) {
1241                 int token;
1242
1243                 if (!*p)
1244                         continue;
1245
1246                 token = match_token(p, tokens, args);
1247                 switch (token) {
1248                 case Opt_barrier:
1249                         mp->m_flags |= XFS_MOUNT_BARRIER;
1250                         break;
1251                 case Opt_nobarrier:
1252                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
1253                         break;
1254                 case Opt_inode64:
1255                         mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1256                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1257                         break;
1258                 case Opt_inode32:
1259                         mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1260                         mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1261                         break;
1262                 default:
1263                         /*
1264                          * Logically we would return an error here to prevent
1265                          * users from believing they might have changed
1266                          * mount options using remount which can't be changed.
1267                          *
1268                          * But unfortunately mount(8) adds all options from
1269                          * mtab and fstab to the mount arguments in some cases
1270                          * so we can't blindly reject options, but have to
1271                          * check for each specified option if it actually
1272                          * differs from the currently set option and only
1273                          * reject it if that's the case.
1274                          *
1275                          * Until that is implemented we return success for
1276                          * every remount request, and silently ignore all
1277                          * options that we can't actually change.
1278                          */
1279 #if 0
1280                         xfs_info(mp,
1281                 "mount option \"%s\" not supported for remount", p);
1282                         return -EINVAL;
1283 #else
1284                         break;
1285 #endif
1286                 }
1287         }
1288
1289         /* ro -> rw */
1290         if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
1291                 if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1292                         xfs_warn(mp,
1293                 "ro->rw transition prohibited on norecovery mount");
1294                         return -EINVAL;
1295                 }
1296
1297                 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
1298                     xfs_sb_has_ro_compat_feature(sbp,
1299                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1300                         xfs_warn(mp,
1301 "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1302                                 (sbp->sb_features_ro_compat &
1303                                         XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1304                         return -EINVAL;
1305                 }
1306
1307                 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1308
1309                 /*
1310                  * If this is the first remount to writeable state we
1311                  * might have some superblock changes to update.
1312                  */
1313                 if (mp->m_update_sb) {
1314                         error = xfs_sync_sb(mp, false);
1315                         if (error) {
1316                                 xfs_warn(mp, "failed to write sb changes");
1317                                 return error;
1318                         }
1319                         mp->m_update_sb = false;
1320                 }
1321
1322                 /*
1323                  * Fill out the reserve pool if it is empty. Use the stashed
1324                  * value if it is non-zero, otherwise go with the default.
1325                  */
1326                 xfs_restore_resvblks(mp);
1327                 xfs_log_work_queue(mp);
1328                 xfs_queue_eofblocks(mp);
1329
1330                 /* Recover any CoW blocks that never got remapped. */
1331                 error = xfs_reflink_recover_cow(mp);
1332                 if (error) {
1333                         xfs_err(mp,
1334         "Error %d recovering leftover CoW allocations.", error);
1335                         xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1336                         return error;
1337                 }
1338
1339                 /* Create the per-AG metadata reservation pool .*/
1340                 error = xfs_fs_reserve_ag_blocks(mp);
1341                 if (error && error != -ENOSPC)
1342                         return error;
1343         }
1344
1345         /* rw -> ro */
1346         if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
1347                 /* Free the per-AG metadata reservation pool. */
1348                 error = xfs_fs_unreserve_ag_blocks(mp);
1349                 if (error) {
1350                         xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1351                         return error;
1352                 }
1353
1354                 /*
1355                  * Before we sync the metadata, we need to free up the reserve
1356                  * block pool so that the used block count in the superblock on
1357                  * disk is correct at the end of the remount. Stash the current
1358                  * reserve pool size so that if we get remounted rw, we can
1359                  * return it to the same size.
1360                  */
1361                 xfs_save_resvblks(mp);
1362
1363                 /*
1364                  * Cancel background eofb scanning so it cannot race with the
1365                  * final log force+buftarg wait and deadlock the remount.
1366                  */
1367                 cancel_delayed_work_sync(&mp->m_eofblocks_work);
1368
1369                 xfs_quiesce_attr(mp);
1370                 mp->m_flags |= XFS_MOUNT_RDONLY;
1371         }
1372
1373         return 0;
1374 }
1375
1376 /*
1377  * Second stage of a freeze. The data is already frozen so we only
1378  * need to take care of the metadata. Once that's done sync the superblock
1379  * to the log to dirty it in case of a crash while frozen. This ensures that we
1380  * will recover the unlinked inode lists on the next mount.
1381  */
1382 STATIC int
1383 xfs_fs_freeze(
1384         struct super_block      *sb)
1385 {
1386         struct xfs_mount        *mp = XFS_M(sb);
1387
1388         xfs_save_resvblks(mp);
1389         xfs_quiesce_attr(mp);
1390         return xfs_sync_sb(mp, true);
1391 }
1392
1393 STATIC int
1394 xfs_fs_unfreeze(
1395         struct super_block      *sb)
1396 {
1397         struct xfs_mount        *mp = XFS_M(sb);
1398
1399         xfs_restore_resvblks(mp);
1400         xfs_log_work_queue(mp);
1401         return 0;
1402 }
1403
1404 STATIC int
1405 xfs_fs_show_options(
1406         struct seq_file         *m,
1407         struct dentry           *root)
1408 {
1409         return xfs_showargs(XFS_M(root->d_sb), m);
1410 }
1411
1412 /*
1413  * This function fills in xfs_mount_t fields based on mount args.
1414  * Note: the superblock _has_ now been read in.
1415  */
1416 STATIC int
1417 xfs_finish_flags(
1418         struct xfs_mount        *mp)
1419 {
1420         int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1421
1422         /* Fail a mount where the logbuf is smaller than the log stripe */
1423         if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1424                 if (mp->m_logbsize <= 0 &&
1425                     mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1426                         mp->m_logbsize = mp->m_sb.sb_logsunit;
1427                 } else if (mp->m_logbsize > 0 &&
1428                            mp->m_logbsize < mp->m_sb.sb_logsunit) {
1429                         xfs_warn(mp,
1430                 "logbuf size must be greater than or equal to log stripe size");
1431                         return -EINVAL;
1432                 }
1433         } else {
1434                 /* Fail a mount if the logbuf is larger than 32K */
1435                 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1436                         xfs_warn(mp,
1437                 "logbuf size for version 1 logs must be 16K or 32K");
1438                         return -EINVAL;
1439                 }
1440         }
1441
1442         /*
1443          * V5 filesystems always use attr2 format for attributes.
1444          */
1445         if (xfs_sb_version_hascrc(&mp->m_sb) &&
1446             (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1447                 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
1448                              "attr2 is always enabled for V5 filesystems.");
1449                 return -EINVAL;
1450         }
1451
1452         /*
1453          * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1454          * told by noattr2 to turn it off
1455          */
1456         if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1457             !(mp->m_flags & XFS_MOUNT_NOATTR2))
1458                 mp->m_flags |= XFS_MOUNT_ATTR2;
1459
1460         /*
1461          * prohibit r/w mounts of read-only filesystems
1462          */
1463         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1464                 xfs_warn(mp,
1465                         "cannot mount a read-only filesystem as read-write");
1466                 return -EROFS;
1467         }
1468
1469         if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1470             (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1471             !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1472                 xfs_warn(mp,
1473                   "Super block does not support project and group quota together");
1474                 return -EINVAL;
1475         }
1476
1477         return 0;
1478 }
1479
1480 static int
1481 xfs_init_percpu_counters(
1482         struct xfs_mount        *mp)
1483 {
1484         int             error;
1485
1486         error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1487         if (error)
1488                 return -ENOMEM;
1489
1490         error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1491         if (error)
1492                 goto free_icount;
1493
1494         error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1495         if (error)
1496                 goto free_ifree;
1497
1498         return 0;
1499
1500 free_ifree:
1501         percpu_counter_destroy(&mp->m_ifree);
1502 free_icount:
1503         percpu_counter_destroy(&mp->m_icount);
1504         return -ENOMEM;
1505 }
1506
1507 void
1508 xfs_reinit_percpu_counters(
1509         struct xfs_mount        *mp)
1510 {
1511         percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1512         percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1513         percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1514 }
1515
1516 static void
1517 xfs_destroy_percpu_counters(
1518         struct xfs_mount        *mp)
1519 {
1520         percpu_counter_destroy(&mp->m_icount);
1521         percpu_counter_destroy(&mp->m_ifree);
1522         percpu_counter_destroy(&mp->m_fdblocks);
1523 }
1524
1525 STATIC int
1526 xfs_fs_fill_super(
1527         struct super_block      *sb,
1528         void                    *data,
1529         int                     silent)
1530 {
1531         struct inode            *root;
1532         struct xfs_mount        *mp = NULL;
1533         int                     flags = 0, error = -ENOMEM;
1534
1535         mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1536         if (!mp)
1537                 goto out;
1538
1539         spin_lock_init(&mp->m_sb_lock);
1540         mutex_init(&mp->m_growlock);
1541         atomic_set(&mp->m_active_trans, 0);
1542         INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1543         INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1544         INIT_DELAYED_WORK(&mp->m_cowblocks_work, xfs_cowblocks_worker);
1545         mp->m_kobj.kobject.kset = xfs_kset;
1546
1547         mp->m_super = sb;
1548         sb->s_fs_info = mp;
1549
1550         error = xfs_parseargs(mp, (char *)data);
1551         if (error)
1552                 goto out_free_fsname;
1553
1554         sb_min_blocksize(sb, BBSIZE);
1555         sb->s_xattr = xfs_xattr_handlers;
1556         sb->s_export_op = &xfs_export_operations;
1557 #ifdef CONFIG_XFS_QUOTA
1558         sb->s_qcop = &xfs_quotactl_operations;
1559         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1560 #endif
1561         sb->s_op = &xfs_super_operations;
1562
1563         if (silent)
1564                 flags |= XFS_MFSI_QUIET;
1565
1566         error = xfs_open_devices(mp);
1567         if (error)
1568                 goto out_free_fsname;
1569
1570         error = xfs_init_mount_workqueues(mp);
1571         if (error)
1572                 goto out_close_devices;
1573
1574         error = xfs_init_percpu_counters(mp);
1575         if (error)
1576                 goto out_destroy_workqueues;
1577
1578         /* Allocate stats memory before we do operations that might use it */
1579         mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1580         if (!mp->m_stats.xs_stats) {
1581                 error = -ENOMEM;
1582                 goto out_destroy_counters;
1583         }
1584
1585         error = xfs_readsb(mp, flags);
1586         if (error)
1587                 goto out_free_stats;
1588
1589         error = xfs_finish_flags(mp);
1590         if (error)
1591                 goto out_free_sb;
1592
1593         error = xfs_setup_devices(mp);
1594         if (error)
1595                 goto out_free_sb;
1596
1597         error = xfs_filestream_mount(mp);
1598         if (error)
1599                 goto out_free_sb;
1600
1601         /*
1602          * we must configure the block size in the superblock before we run the
1603          * full mount process as the mount process can lookup and cache inodes.
1604          */
1605         sb->s_magic = XFS_SB_MAGIC;
1606         sb->s_blocksize = mp->m_sb.sb_blocksize;
1607         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1608         sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1609         sb->s_max_links = XFS_MAXLINK;
1610         sb->s_time_gran = 1;
1611         set_posix_acl_flag(sb);
1612
1613         /* version 5 superblocks support inode version counters. */
1614         if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1615                 sb->s_flags |= MS_I_VERSION;
1616
1617         if (mp->m_flags & XFS_MOUNT_DAX) {
1618                 xfs_warn(mp,
1619                 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1620
1621                 error = bdev_dax_supported(sb, sb->s_blocksize);
1622                 if (error) {
1623                         xfs_alert(mp,
1624                         "DAX unsupported by block device. Turning off DAX.");
1625                         mp->m_flags &= ~XFS_MOUNT_DAX;
1626                 }
1627                 if (xfs_sb_version_hasreflink(&mp->m_sb))
1628                         xfs_alert(mp,
1629                 "DAX and reflink have not been tested together!");
1630         }
1631
1632         if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
1633                 if (mp->m_sb.sb_rblocks) {
1634                         xfs_alert(mp,
1635         "EXPERIMENTAL reverse mapping btree not compatible with realtime device!");
1636                         error = -EINVAL;
1637                         goto out_filestream_unmount;
1638                 }
1639                 xfs_alert(mp,
1640         "EXPERIMENTAL reverse mapping btree feature enabled. Use at your own risk!");
1641         }
1642
1643         if (xfs_sb_version_hasreflink(&mp->m_sb))
1644                 xfs_alert(mp,
1645         "EXPERIMENTAL reflink feature enabled. Use at your own risk!");
1646
1647         error = xfs_mountfs(mp);
1648         if (error)
1649                 goto out_filestream_unmount;
1650
1651         root = igrab(VFS_I(mp->m_rootip));
1652         if (!root) {
1653                 error = -ENOENT;
1654                 goto out_unmount;
1655         }
1656         sb->s_root = d_make_root(root);
1657         if (!sb->s_root) {
1658                 error = -ENOMEM;
1659                 goto out_unmount;
1660         }
1661
1662         return 0;
1663
1664  out_filestream_unmount:
1665         xfs_filestream_unmount(mp);
1666  out_free_sb:
1667         xfs_freesb(mp);
1668  out_free_stats:
1669         free_percpu(mp->m_stats.xs_stats);
1670  out_destroy_counters:
1671         xfs_destroy_percpu_counters(mp);
1672  out_destroy_workqueues:
1673         xfs_destroy_mount_workqueues(mp);
1674  out_close_devices:
1675         xfs_close_devices(mp);
1676  out_free_fsname:
1677         sb->s_fs_info = NULL;
1678         xfs_free_fsname(mp);
1679         kfree(mp);
1680  out:
1681         return error;
1682
1683  out_unmount:
1684         xfs_filestream_unmount(mp);
1685         xfs_unmountfs(mp);
1686         goto out_free_sb;
1687 }
1688
1689 STATIC void
1690 xfs_fs_put_super(
1691         struct super_block      *sb)
1692 {
1693         struct xfs_mount        *mp = XFS_M(sb);
1694
1695         /* if ->fill_super failed, we have no mount to tear down */
1696         if (!sb->s_fs_info)
1697                 return;
1698
1699         xfs_notice(mp, "Unmounting Filesystem");
1700         xfs_filestream_unmount(mp);
1701         xfs_unmountfs(mp);
1702
1703         xfs_freesb(mp);
1704         free_percpu(mp->m_stats.xs_stats);
1705         xfs_destroy_percpu_counters(mp);
1706         xfs_destroy_mount_workqueues(mp);
1707         xfs_close_devices(mp);
1708
1709         sb->s_fs_info = NULL;
1710         xfs_free_fsname(mp);
1711         kfree(mp);
1712 }
1713
1714 STATIC struct dentry *
1715 xfs_fs_mount(
1716         struct file_system_type *fs_type,
1717         int                     flags,
1718         const char              *dev_name,
1719         void                    *data)
1720 {
1721         return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1722 }
1723
1724 static long
1725 xfs_fs_nr_cached_objects(
1726         struct super_block      *sb,
1727         struct shrink_control   *sc)
1728 {
1729         /* Paranoia: catch incorrect calls during mount setup or teardown */
1730         if (WARN_ON_ONCE(!sb->s_fs_info))
1731                 return 0;
1732         return xfs_reclaim_inodes_count(XFS_M(sb));
1733 }
1734
1735 static long
1736 xfs_fs_free_cached_objects(
1737         struct super_block      *sb,
1738         struct shrink_control   *sc)
1739 {
1740         return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1741 }
1742
1743 static const struct super_operations xfs_super_operations = {
1744         .alloc_inode            = xfs_fs_alloc_inode,
1745         .destroy_inode          = xfs_fs_destroy_inode,
1746         .drop_inode             = xfs_fs_drop_inode,
1747         .put_super              = xfs_fs_put_super,
1748         .sync_fs                = xfs_fs_sync_fs,
1749         .freeze_fs              = xfs_fs_freeze,
1750         .unfreeze_fs            = xfs_fs_unfreeze,
1751         .statfs                 = xfs_fs_statfs,
1752         .remount_fs             = xfs_fs_remount,
1753         .show_options           = xfs_fs_show_options,
1754         .nr_cached_objects      = xfs_fs_nr_cached_objects,
1755         .free_cached_objects    = xfs_fs_free_cached_objects,
1756 };
1757
1758 static struct file_system_type xfs_fs_type = {
1759         .owner                  = THIS_MODULE,
1760         .name                   = "xfs",
1761         .mount                  = xfs_fs_mount,
1762         .kill_sb                = kill_block_super,
1763         .fs_flags               = FS_REQUIRES_DEV,
1764 };
1765 MODULE_ALIAS_FS("xfs");
1766
1767 STATIC int __init
1768 xfs_init_zones(void)
1769 {
1770         xfs_ioend_bioset = bioset_create(4 * MAX_BUF_PER_PAGE,
1771                         offsetof(struct xfs_ioend, io_inline_bio));
1772         if (!xfs_ioend_bioset)
1773                 goto out;
1774
1775         xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1776                                                 "xfs_log_ticket");
1777         if (!xfs_log_ticket_zone)
1778                 goto out_free_ioend_bioset;
1779
1780         xfs_bmap_free_item_zone = kmem_zone_init(
1781                         sizeof(struct xfs_extent_free_item),
1782                         "xfs_bmap_free_item");
1783         if (!xfs_bmap_free_item_zone)
1784                 goto out_destroy_log_ticket_zone;
1785
1786         xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1787                                                 "xfs_btree_cur");
1788         if (!xfs_btree_cur_zone)
1789                 goto out_destroy_bmap_free_item_zone;
1790
1791         xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1792                                                 "xfs_da_state");
1793         if (!xfs_da_state_zone)
1794                 goto out_destroy_btree_cur_zone;
1795
1796         xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1797         if (!xfs_ifork_zone)
1798                 goto out_destroy_da_state_zone;
1799
1800         xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1801         if (!xfs_trans_zone)
1802                 goto out_destroy_ifork_zone;
1803
1804         xfs_log_item_desc_zone =
1805                 kmem_zone_init(sizeof(struct xfs_log_item_desc),
1806                                "xfs_log_item_desc");
1807         if (!xfs_log_item_desc_zone)
1808                 goto out_destroy_trans_zone;
1809
1810         /*
1811          * The size of the zone allocated buf log item is the maximum
1812          * size possible under XFS.  This wastes a little bit of memory,
1813          * but it is much faster.
1814          */
1815         xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1816                                            "xfs_buf_item");
1817         if (!xfs_buf_item_zone)
1818                 goto out_destroy_log_item_desc_zone;
1819
1820         xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1821                         ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1822                                  sizeof(xfs_extent_t))), "xfs_efd_item");
1823         if (!xfs_efd_zone)
1824                 goto out_destroy_buf_item_zone;
1825
1826         xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1827                         ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1828                                 sizeof(xfs_extent_t))), "xfs_efi_item");
1829         if (!xfs_efi_zone)
1830                 goto out_destroy_efd_zone;
1831
1832         xfs_inode_zone =
1833                 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1834                         KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD |
1835                         KM_ZONE_ACCOUNT, xfs_fs_inode_init_once);
1836         if (!xfs_inode_zone)
1837                 goto out_destroy_efi_zone;
1838
1839         xfs_ili_zone =
1840                 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1841                                         KM_ZONE_SPREAD, NULL);
1842         if (!xfs_ili_zone)
1843                 goto out_destroy_inode_zone;
1844         xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1845                                         "xfs_icr");
1846         if (!xfs_icreate_zone)
1847                 goto out_destroy_ili_zone;
1848
1849         xfs_rud_zone = kmem_zone_init(sizeof(struct xfs_rud_log_item),
1850                         "xfs_rud_item");
1851         if (!xfs_rud_zone)
1852                 goto out_destroy_icreate_zone;
1853
1854         xfs_rui_zone = kmem_zone_init(
1855                         xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
1856                         "xfs_rui_item");
1857         if (!xfs_rui_zone)
1858                 goto out_destroy_rud_zone;
1859
1860         xfs_cud_zone = kmem_zone_init(sizeof(struct xfs_cud_log_item),
1861                         "xfs_cud_item");
1862         if (!xfs_cud_zone)
1863                 goto out_destroy_rui_zone;
1864
1865         xfs_cui_zone = kmem_zone_init(
1866                         xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
1867                         "xfs_cui_item");
1868         if (!xfs_cui_zone)
1869                 goto out_destroy_cud_zone;
1870
1871         xfs_bud_zone = kmem_zone_init(sizeof(struct xfs_bud_log_item),
1872                         "xfs_bud_item");
1873         if (!xfs_bud_zone)
1874                 goto out_destroy_cui_zone;
1875
1876         xfs_bui_zone = kmem_zone_init(
1877                         xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
1878                         "xfs_bui_item");
1879         if (!xfs_bui_zone)
1880                 goto out_destroy_bud_zone;
1881
1882         return 0;
1883
1884  out_destroy_bud_zone:
1885         kmem_zone_destroy(xfs_bud_zone);
1886  out_destroy_cui_zone:
1887         kmem_zone_destroy(xfs_cui_zone);
1888  out_destroy_cud_zone:
1889         kmem_zone_destroy(xfs_cud_zone);
1890  out_destroy_rui_zone:
1891         kmem_zone_destroy(xfs_rui_zone);
1892  out_destroy_rud_zone:
1893         kmem_zone_destroy(xfs_rud_zone);
1894  out_destroy_icreate_zone:
1895         kmem_zone_destroy(xfs_icreate_zone);
1896  out_destroy_ili_zone:
1897         kmem_zone_destroy(xfs_ili_zone);
1898  out_destroy_inode_zone:
1899         kmem_zone_destroy(xfs_inode_zone);
1900  out_destroy_efi_zone:
1901         kmem_zone_destroy(xfs_efi_zone);
1902  out_destroy_efd_zone:
1903         kmem_zone_destroy(xfs_efd_zone);
1904  out_destroy_buf_item_zone:
1905         kmem_zone_destroy(xfs_buf_item_zone);
1906  out_destroy_log_item_desc_zone:
1907         kmem_zone_destroy(xfs_log_item_desc_zone);
1908  out_destroy_trans_zone:
1909         kmem_zone_destroy(xfs_trans_zone);
1910  out_destroy_ifork_zone:
1911         kmem_zone_destroy(xfs_ifork_zone);
1912  out_destroy_da_state_zone:
1913         kmem_zone_destroy(xfs_da_state_zone);
1914  out_destroy_btree_cur_zone:
1915         kmem_zone_destroy(xfs_btree_cur_zone);
1916  out_destroy_bmap_free_item_zone:
1917         kmem_zone_destroy(xfs_bmap_free_item_zone);
1918  out_destroy_log_ticket_zone:
1919         kmem_zone_destroy(xfs_log_ticket_zone);
1920  out_free_ioend_bioset:
1921         bioset_free(xfs_ioend_bioset);
1922  out:
1923         return -ENOMEM;
1924 }
1925
1926 STATIC void
1927 xfs_destroy_zones(void)
1928 {
1929         /*
1930          * Make sure all delayed rcu free are flushed before we
1931          * destroy caches.
1932          */
1933         rcu_barrier();
1934         kmem_zone_destroy(xfs_bui_zone);
1935         kmem_zone_destroy(xfs_bud_zone);
1936         kmem_zone_destroy(xfs_cui_zone);
1937         kmem_zone_destroy(xfs_cud_zone);
1938         kmem_zone_destroy(xfs_rui_zone);
1939         kmem_zone_destroy(xfs_rud_zone);
1940         kmem_zone_destroy(xfs_icreate_zone);
1941         kmem_zone_destroy(xfs_ili_zone);
1942         kmem_zone_destroy(xfs_inode_zone);
1943         kmem_zone_destroy(xfs_efi_zone);
1944         kmem_zone_destroy(xfs_efd_zone);
1945         kmem_zone_destroy(xfs_buf_item_zone);
1946         kmem_zone_destroy(xfs_log_item_desc_zone);
1947         kmem_zone_destroy(xfs_trans_zone);
1948         kmem_zone_destroy(xfs_ifork_zone);
1949         kmem_zone_destroy(xfs_da_state_zone);
1950         kmem_zone_destroy(xfs_btree_cur_zone);
1951         kmem_zone_destroy(xfs_bmap_free_item_zone);
1952         kmem_zone_destroy(xfs_log_ticket_zone);
1953         bioset_free(xfs_ioend_bioset);
1954 }
1955
1956 STATIC int __init
1957 xfs_init_workqueues(void)
1958 {
1959         /*
1960          * The allocation workqueue can be used in memory reclaim situations
1961          * (writepage path), and parallelism is only limited by the number of
1962          * AGs in all the filesystems mounted. Hence use the default large
1963          * max_active value for this workqueue.
1964          */
1965         xfs_alloc_wq = alloc_workqueue("xfsalloc",
1966                         WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
1967         if (!xfs_alloc_wq)
1968                 return -ENOMEM;
1969
1970         return 0;
1971 }
1972
1973 STATIC void
1974 xfs_destroy_workqueues(void)
1975 {
1976         destroy_workqueue(xfs_alloc_wq);
1977 }
1978
1979 STATIC int __init
1980 init_xfs_fs(void)
1981 {
1982         int                     error;
1983
1984         xfs_check_ondisk_structs();
1985
1986         printk(KERN_INFO XFS_VERSION_STRING " with "
1987                          XFS_BUILD_OPTIONS " enabled\n");
1988
1989         xfs_extent_free_init_defer_op();
1990         xfs_rmap_update_init_defer_op();
1991         xfs_refcount_update_init_defer_op();
1992         xfs_bmap_update_init_defer_op();
1993
1994         xfs_dir_startup();
1995
1996         error = xfs_init_zones();
1997         if (error)
1998                 goto out;
1999
2000         error = xfs_init_workqueues();
2001         if (error)
2002                 goto out_destroy_zones;
2003
2004         error = xfs_mru_cache_init();
2005         if (error)
2006                 goto out_destroy_wq;
2007
2008         error = xfs_buf_init();
2009         if (error)
2010                 goto out_mru_cache_uninit;
2011
2012         error = xfs_init_procfs();
2013         if (error)
2014                 goto out_buf_terminate;
2015
2016         error = xfs_sysctl_register();
2017         if (error)
2018                 goto out_cleanup_procfs;
2019
2020         xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
2021         if (!xfs_kset) {
2022                 error = -ENOMEM;
2023                 goto out_sysctl_unregister;
2024         }
2025
2026         xfsstats.xs_kobj.kobject.kset = xfs_kset;
2027
2028         xfsstats.xs_stats = alloc_percpu(struct xfsstats);
2029         if (!xfsstats.xs_stats) {
2030                 error = -ENOMEM;
2031                 goto out_kset_unregister;
2032         }
2033
2034         error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
2035                                "stats");
2036         if (error)
2037                 goto out_free_stats;
2038
2039 #ifdef DEBUG
2040         xfs_dbg_kobj.kobject.kset = xfs_kset;
2041         error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
2042         if (error)
2043                 goto out_remove_stats_kobj;
2044 #endif
2045
2046         error = xfs_qm_init();
2047         if (error)
2048                 goto out_remove_dbg_kobj;
2049
2050         error = register_filesystem(&xfs_fs_type);
2051         if (error)
2052                 goto out_qm_exit;
2053         return 0;
2054
2055  out_qm_exit:
2056         xfs_qm_exit();
2057  out_remove_dbg_kobj:
2058 #ifdef DEBUG
2059         xfs_sysfs_del(&xfs_dbg_kobj);
2060  out_remove_stats_kobj:
2061 #endif
2062         xfs_sysfs_del(&xfsstats.xs_kobj);
2063  out_free_stats:
2064         free_percpu(xfsstats.xs_stats);
2065  out_kset_unregister:
2066         kset_unregister(xfs_kset);
2067  out_sysctl_unregister:
2068         xfs_sysctl_unregister();
2069  out_cleanup_procfs:
2070         xfs_cleanup_procfs();
2071  out_buf_terminate:
2072         xfs_buf_terminate();
2073  out_mru_cache_uninit:
2074         xfs_mru_cache_uninit();
2075  out_destroy_wq:
2076         xfs_destroy_workqueues();
2077  out_destroy_zones:
2078         xfs_destroy_zones();
2079  out:
2080         return error;
2081 }
2082
2083 STATIC void __exit
2084 exit_xfs_fs(void)
2085 {
2086         xfs_qm_exit();
2087         unregister_filesystem(&xfs_fs_type);
2088 #ifdef DEBUG
2089         xfs_sysfs_del(&xfs_dbg_kobj);
2090 #endif
2091         xfs_sysfs_del(&xfsstats.xs_kobj);
2092         free_percpu(xfsstats.xs_stats);
2093         kset_unregister(xfs_kset);
2094         xfs_sysctl_unregister();
2095         xfs_cleanup_procfs();
2096         xfs_buf_terminate();
2097         xfs_mru_cache_uninit();
2098         xfs_destroy_workqueues();
2099         xfs_destroy_zones();
2100         xfs_uuid_table_free();
2101 }
2102
2103 module_init(init_xfs_fs);
2104 module_exit(exit_xfs_fs);
2105
2106 MODULE_AUTHOR("Silicon Graphics, Inc.");
2107 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2108 MODULE_LICENSE("GPL");