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mm: CONFIG_ZONE_DEVICE stop depending on CONFIG_EXPERT
[linux-2.6/btrfs-unstable.git] / fs / xfs / xfs_super.c
blob0303f1005f884e0314539c94bf2a36349bc31fab
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
50 #include <linux/namei.h>
51 #include <linux/init.h>
52 #include <linux/slab.h>
53 #include <linux/mount.h>
54 #include <linux/mempool.h>
55 #include <linux/writeback.h>
56 #include <linux/kthread.h>
57 #include <linux/freezer.h>
58 #include <linux/parser.h>
59
60 static const struct super_operations xfs_super_operations;
61 struct bio_set *xfs_ioend_bioset;
62
63 static struct kset *xfs_kset; /* top-level xfs sysfs dir */
64 #ifdef DEBUG
65 static struct xfs_kobj xfs_dbg_kobj; /* global debug sysfs attrs */
66 #endif
67
68 /*
69 * Table driven mount option parser.
70 */
71 enum {
72 Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev, Opt_biosize,
73 Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
74 Opt_mtpt, Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
75 Opt_allocsize, Opt_norecovery, Opt_barrier, Opt_nobarrier,
76 Opt_inode64, Opt_inode32, Opt_ikeep, Opt_noikeep,
77 Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2, Opt_filestreams,
78 Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota, Opt_prjquota,
79 Opt_uquota, Opt_gquota, Opt_pquota,
80 Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
81 Opt_discard, Opt_nodiscard, Opt_dax, Opt_err,
82 };
83
84 static const match_table_t tokens = {
85 {Opt_logbufs, "logbufs=%u"}, /* number of XFS log buffers */
86 {Opt_logbsize, "logbsize=%s"}, /* size of XFS log buffers */
87 {Opt_logdev, "logdev=%s"}, /* log device */
88 {Opt_rtdev, "rtdev=%s"}, /* realtime I/O device */
89 {Opt_biosize, "biosize=%u"}, /* log2 of preferred buffered io size */
90 {Opt_wsync, "wsync"}, /* safe-mode nfs compatible mount */
91 {Opt_noalign, "noalign"}, /* turn off stripe alignment */
92 {Opt_swalloc, "swalloc"}, /* turn on stripe width allocation */
93 {Opt_sunit, "sunit=%u"}, /* data volume stripe unit */
94 {Opt_swidth, "swidth=%u"}, /* data volume stripe width */
95 {Opt_nouuid, "nouuid"}, /* ignore filesystem UUID */
96 {Opt_mtpt, "mtpt"}, /* filesystem mount point */
97 {Opt_grpid, "grpid"}, /* group-ID from parent directory */
98 {Opt_nogrpid, "nogrpid"}, /* group-ID from current process */
99 {Opt_bsdgroups, "bsdgroups"}, /* group-ID from parent directory */
100 {Opt_sysvgroups,"sysvgroups"}, /* group-ID from current process */
101 {Opt_allocsize, "allocsize=%s"},/* preferred allocation size */
102 {Opt_norecovery,"norecovery"}, /* don't run XFS recovery */
103 {Opt_barrier, "barrier"}, /* use writer barriers for log write and
104 * unwritten extent conversion */
105 {Opt_nobarrier, "nobarrier"}, /* .. disable */
106 {Opt_inode64, "inode64"}, /* inodes can be allocated anywhere */
107 {Opt_inode32, "inode32"}, /* inode allocation limited to
108 * XFS_MAXINUMBER_32 */
109 {Opt_ikeep, "ikeep"}, /* do not free empty inode clusters */
110 {Opt_noikeep, "noikeep"}, /* free empty inode clusters */
111 {Opt_largeio, "largeio"}, /* report large I/O sizes in stat() */
112 {Opt_nolargeio, "nolargeio"}, /* do not report large I/O sizes
113 * in stat(). */
114 {Opt_attr2, "attr2"}, /* do use attr2 attribute format */
115 {Opt_noattr2, "noattr2"}, /* do not use attr2 attribute format */
116 {Opt_filestreams,"filestreams"},/* use filestreams allocator */
117 {Opt_quota, "quota"}, /* disk quotas (user) */
118 {Opt_noquota, "noquota"}, /* no quotas */
119 {Opt_usrquota, "usrquota"}, /* user quota enabled */
120 {Opt_grpquota, "grpquota"}, /* group quota enabled */
121 {Opt_prjquota, "prjquota"}, /* project quota enabled */
122 {Opt_uquota, "uquota"}, /* user quota (IRIX variant) */
123 {Opt_gquota, "gquota"}, /* group quota (IRIX variant) */
124 {Opt_pquota, "pquota"}, /* project quota (IRIX variant) */
125 {Opt_uqnoenforce,"uqnoenforce"},/* user quota limit enforcement */
126 {Opt_gqnoenforce,"gqnoenforce"},/* group quota limit enforcement */
127 {Opt_pqnoenforce,"pqnoenforce"},/* project quota limit enforcement */
128 {Opt_qnoenforce, "qnoenforce"}, /* same as uqnoenforce */
129 {Opt_discard, "discard"}, /* Discard unused blocks */
130 {Opt_nodiscard, "nodiscard"}, /* Do not discard unused blocks */
131
132 {Opt_dax, "dax"}, /* Enable direct access to bdev pages */
133 {Opt_err, NULL},
134 };
135
136
137 STATIC int
138 suffix_kstrtoint(const substring_t *s, unsigned int base, int *res)
139 {
140 int last, shift_left_factor = 0, _res;
141 char *value;
142 int ret = 0;
143
144 value = match_strdup(s);
145 if (!value)
146 return -ENOMEM;
147
148 last = strlen(value) - 1;
149 if (value[last] == 'K' || value[last] == 'k') {
150 shift_left_factor = 10;
151 value[last] = '\0';
152 }
153 if (value[last] == 'M' || value[last] == 'm') {
154 shift_left_factor = 20;
155 value[last] = '\0';
156 }
157 if (value[last] == 'G' || value[last] == 'g') {
158 shift_left_factor = 30;
159 value[last] = '\0';
160 }
161
162 if (kstrtoint(value, base, &_res))
163 ret = -EINVAL;
164 kfree(value);
165 *res = _res << shift_left_factor;
166 return ret;
167 }
168
169 /*
170 * This function fills in xfs_mount_t fields based on mount args.
171 * Note: the superblock has _not_ yet been read in.
172 *
173 * Note that this function leaks the various device name allocations on
174 * failure. The caller takes care of them.
175 *
176 * *sb is const because this is also used to test options on the remount
177 * path, and we don't want this to have any side effects at remount time.
178 * Today this function does not change *sb, but just to future-proof...
179 */
180 STATIC int
181 xfs_parseargs(
182 struct xfs_mount *mp,
183 char *options)
184 {
185 const struct super_block *sb = mp->m_super;
186 char *p;
187 substring_t args[MAX_OPT_ARGS];
188 int dsunit = 0;
189 int dswidth = 0;
190 int iosize = 0;
191 __uint8_t iosizelog = 0;
192
193 /*
194 * set up the mount name first so all the errors will refer to the
195 * correct device.
196 */
197 mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
198 if (!mp->m_fsname)
199 return -ENOMEM;
200 mp->m_fsname_len = strlen(mp->m_fsname) + 1;
201
202 /*
203 * Copy binary VFS mount flags we are interested in.
204 */
205 if (sb->s_flags & MS_RDONLY)
206 mp->m_flags |= XFS_MOUNT_RDONLY;
207 if (sb->s_flags & MS_DIRSYNC)
208 mp->m_flags |= XFS_MOUNT_DIRSYNC;
209 if (sb->s_flags & MS_SYNCHRONOUS)
210 mp->m_flags |= XFS_MOUNT_WSYNC;
211
212 /*
213 * Set some default flags that could be cleared by the mount option
214 * parsing.
215 */
216 mp->m_flags |= XFS_MOUNT_BARRIER;
217 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
218
219 /*
220 * These can be overridden by the mount option parsing.
221 */
222 mp->m_logbufs = -1;
223 mp->m_logbsize = -1;
224
225 if (!options)
226 goto done;
227
228 while ((p = strsep(&options, ",")) != NULL) {
229 int token;
230
231 if (!*p)
232 continue;
233
234 token = match_token(p, tokens, args);
235 switch (token) {
236 case Opt_logbufs:
237 if (match_int(args, &mp->m_logbufs))
238 return -EINVAL;
239 break;
240 case Opt_logbsize:
241 if (suffix_kstrtoint(args, 10, &mp->m_logbsize))
242 return -EINVAL;
243 break;
244 case Opt_logdev:
245 mp->m_logname = match_strdup(args);
246 if (!mp->m_logname)
247 return -ENOMEM;
248 break;
249 case Opt_mtpt:
250 xfs_warn(mp, "%s option not allowed on this system", p);
251 return -EINVAL;
252 case Opt_rtdev:
253 mp->m_rtname = match_strdup(args);
254 if (!mp->m_rtname)
255 return -ENOMEM;
256 break;
257 case Opt_allocsize:
258 case Opt_biosize:
259 if (suffix_kstrtoint(args, 10, &iosize))
260 return -EINVAL;
261 iosizelog = ffs(iosize) - 1;
262 break;
263 case Opt_grpid:
264 case Opt_bsdgroups:
265 mp->m_flags |= XFS_MOUNT_GRPID;
266 break;
267 case Opt_nogrpid:
268 case Opt_sysvgroups:
269 mp->m_flags &= ~XFS_MOUNT_GRPID;
270 break;
271 case Opt_wsync:
272 mp->m_flags |= XFS_MOUNT_WSYNC;
273 break;
274 case Opt_norecovery:
275 mp->m_flags |= XFS_MOUNT_NORECOVERY;
276 break;
277 case Opt_noalign:
278 mp->m_flags |= XFS_MOUNT_NOALIGN;
279 break;
280 case Opt_swalloc:
281 mp->m_flags |= XFS_MOUNT_SWALLOC;
282 break;
283 case Opt_sunit:
284 if (match_int(args, &dsunit))
285 return -EINVAL;
286 break;
287 case Opt_swidth:
288 if (match_int(args, &dswidth))
289 return -EINVAL;
290 break;
291 case Opt_inode32:
292 mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
293 break;
294 case Opt_inode64:
295 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
296 break;
297 case Opt_nouuid:
298 mp->m_flags |= XFS_MOUNT_NOUUID;
299 break;
300 case Opt_barrier:
301 mp->m_flags |= XFS_MOUNT_BARRIER;
302 break;
303 case Opt_nobarrier:
304 mp->m_flags &= ~XFS_MOUNT_BARRIER;
305 break;
306 case Opt_ikeep:
307 mp->m_flags |= XFS_MOUNT_IKEEP;
308 break;
309 case Opt_noikeep:
310 mp->m_flags &= ~XFS_MOUNT_IKEEP;
311 break;
312 case Opt_largeio:
313 mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
314 break;
315 case Opt_nolargeio:
316 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
317 break;
318 case Opt_attr2:
319 mp->m_flags |= XFS_MOUNT_ATTR2;
320 break;
321 case Opt_noattr2:
322 mp->m_flags &= ~XFS_MOUNT_ATTR2;
323 mp->m_flags |= XFS_MOUNT_NOATTR2;
324 break;
325 case Opt_filestreams:
326 mp->m_flags |= XFS_MOUNT_FILESTREAMS;
327 break;
328 case Opt_noquota:
329 mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
330 mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
331 mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
332 break;
333 case Opt_quota:
334 case Opt_uquota:
335 case Opt_usrquota:
336 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
337 XFS_UQUOTA_ENFD);
338 break;
339 case Opt_qnoenforce:
340 case Opt_uqnoenforce:
341 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
342 mp->m_qflags &= ~XFS_UQUOTA_ENFD;
343 break;
344 case Opt_pquota:
345 case Opt_prjquota:
346 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
347 XFS_PQUOTA_ENFD);
348 break;
349 case Opt_pqnoenforce:
350 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
351 mp->m_qflags &= ~XFS_PQUOTA_ENFD;
352 break;
353 case Opt_gquota:
354 case Opt_grpquota:
355 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
356 XFS_GQUOTA_ENFD);
357 break;
358 case Opt_gqnoenforce:
359 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
360 mp->m_qflags &= ~XFS_GQUOTA_ENFD;
361 break;
362 case Opt_discard:
363 mp->m_flags |= XFS_MOUNT_DISCARD;
364 break;
365 case Opt_nodiscard:
366 mp->m_flags &= ~XFS_MOUNT_DISCARD;
367 break;
368 #ifdef CONFIG_FS_DAX
369 case Opt_dax:
370 mp->m_flags |= XFS_MOUNT_DAX;
371 break;
372 #endif
373 default:
374 xfs_warn(mp, "unknown mount option [%s].", p);
375 return -EINVAL;
376 }
377 }
378
379 /*
380 * no recovery flag requires a read-only mount
381 */
382 if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
383 !(mp->m_flags & XFS_MOUNT_RDONLY)) {
384 xfs_warn(mp, "no-recovery mounts must be read-only.");
385 return -EINVAL;
386 }
387
388 if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
389 xfs_warn(mp,
390 "sunit and swidth options incompatible with the noalign option");
391 return -EINVAL;
392 }
393
394 #ifndef CONFIG_XFS_QUOTA
395 if (XFS_IS_QUOTA_RUNNING(mp)) {
396 xfs_warn(mp, "quota support not available in this kernel.");
397 return -EINVAL;
398 }
399 #endif
400
401 if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
402 xfs_warn(mp, "sunit and swidth must be specified together");
403 return -EINVAL;
404 }
405
406 if (dsunit && (dswidth % dsunit != 0)) {
407 xfs_warn(mp,
408 "stripe width (%d) must be a multiple of the stripe unit (%d)",
409 dswidth, dsunit);
410 return -EINVAL;
411 }
412
413 done:
414 if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
415 /*
416 * At this point the superblock has not been read
417 * in, therefore we do not know the block size.
418 * Before the mount call ends we will convert
419 * these to FSBs.
420 */
421 mp->m_dalign = dsunit;
422 mp->m_swidth = dswidth;
423 }
424
425 if (mp->m_logbufs != -1 &&
426 mp->m_logbufs != 0 &&
427 (mp->m_logbufs < XLOG_MIN_ICLOGS ||
428 mp->m_logbufs > XLOG_MAX_ICLOGS)) {
429 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
430 mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
431 return -EINVAL;
432 }
433 if (mp->m_logbsize != -1 &&
434 mp->m_logbsize != 0 &&
435 (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
436 mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
437 !is_power_of_2(mp->m_logbsize))) {
438 xfs_warn(mp,
439 "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
440 mp->m_logbsize);
441 return -EINVAL;
442 }
443
444 if (iosizelog) {
445 if (iosizelog > XFS_MAX_IO_LOG ||
446 iosizelog < XFS_MIN_IO_LOG) {
447 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
448 iosizelog, XFS_MIN_IO_LOG,
449 XFS_MAX_IO_LOG);
450 return -EINVAL;
451 }
452
453 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
454 mp->m_readio_log = iosizelog;
455 mp->m_writeio_log = iosizelog;
456 }
457
458 return 0;
459 }
460
461 struct proc_xfs_info {
462 uint64_t flag;
463 char *str;
464 };
465
466 STATIC int
467 xfs_showargs(
468 struct xfs_mount *mp,
469 struct seq_file *m)
470 {
471 static struct proc_xfs_info xfs_info_set[] = {
472 /* the few simple ones we can get from the mount struct */
473 { XFS_MOUNT_IKEEP, ",ikeep" },
474 { XFS_MOUNT_WSYNC, ",wsync" },
475 { XFS_MOUNT_NOALIGN, ",noalign" },
476 { XFS_MOUNT_SWALLOC, ",swalloc" },
477 { XFS_MOUNT_NOUUID, ",nouuid" },
478 { XFS_MOUNT_NORECOVERY, ",norecovery" },
479 { XFS_MOUNT_ATTR2, ",attr2" },
480 { XFS_MOUNT_FILESTREAMS, ",filestreams" },
481 { XFS_MOUNT_GRPID, ",grpid" },
482 { XFS_MOUNT_DISCARD, ",discard" },
483 { XFS_MOUNT_SMALL_INUMS, ",inode32" },
484 { XFS_MOUNT_DAX, ",dax" },
485 { 0, NULL }
486 };
487 static struct proc_xfs_info xfs_info_unset[] = {
488 /* the few simple ones we can get from the mount struct */
489 { XFS_MOUNT_COMPAT_IOSIZE, ",largeio" },
490 { XFS_MOUNT_BARRIER, ",nobarrier" },
491 { XFS_MOUNT_SMALL_INUMS, ",inode64" },
492 { 0, NULL }
493 };
494 struct proc_xfs_info *xfs_infop;
495
496 for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
497 if (mp->m_flags & xfs_infop->flag)
498 seq_puts(m, xfs_infop->str);
499 }
500 for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
501 if (!(mp->m_flags & xfs_infop->flag))
502 seq_puts(m, xfs_infop->str);
503 }
504
505 if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
506 seq_printf(m, ",allocsize=%dk",
507 (int)(1 << mp->m_writeio_log) >> 10);
508
509 if (mp->m_logbufs > 0)
510 seq_printf(m, ",logbufs=%d", mp->m_logbufs);
511 if (mp->m_logbsize > 0)
512 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
513
514 if (mp->m_logname)
515 seq_show_option(m, "logdev", mp->m_logname);
516 if (mp->m_rtname)
517 seq_show_option(m, "rtdev", mp->m_rtname);
518
519 if (mp->m_dalign > 0)
520 seq_printf(m, ",sunit=%d",
521 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
522 if (mp->m_swidth > 0)
523 seq_printf(m, ",swidth=%d",
524 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
525
526 if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
527 seq_puts(m, ",usrquota");
528 else if (mp->m_qflags & XFS_UQUOTA_ACCT)
529 seq_puts(m, ",uqnoenforce");
530
531 if (mp->m_qflags & XFS_PQUOTA_ACCT) {
532 if (mp->m_qflags & XFS_PQUOTA_ENFD)
533 seq_puts(m, ",prjquota");
534 else
535 seq_puts(m, ",pqnoenforce");
536 }
537 if (mp->m_qflags & XFS_GQUOTA_ACCT) {
538 if (mp->m_qflags & XFS_GQUOTA_ENFD)
539 seq_puts(m, ",grpquota");
540 else
541 seq_puts(m, ",gqnoenforce");
542 }
543
544 if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
545 seq_puts(m, ",noquota");
546
547 return 0;
548 }
549 static __uint64_t
550 xfs_max_file_offset(
551 unsigned int blockshift)
552 {
553 unsigned int pagefactor = 1;
554 unsigned int bitshift = BITS_PER_LONG - 1;
555
556 /* Figure out maximum filesize, on Linux this can depend on
557 * the filesystem blocksize (on 32 bit platforms).
558 * __block_write_begin does this in an [unsigned] long...
559 * page->index << (PAGE_SHIFT - bbits)
560 * So, for page sized blocks (4K on 32 bit platforms),
561 * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
562 * (((u64)PAGE_SIZE << (BITS_PER_LONG-1))-1)
563 * but for smaller blocksizes it is less (bbits = log2 bsize).
564 * Note1: get_block_t takes a long (implicit cast from above)
565 * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
566 * can optionally convert the [unsigned] long from above into
567 * an [unsigned] long long.
568 */
569
570 #if BITS_PER_LONG == 32
571 # if defined(CONFIG_LBDAF)
572 ASSERT(sizeof(sector_t) == 8);
573 pagefactor = PAGE_SIZE;
574 bitshift = BITS_PER_LONG;
575 # else
576 pagefactor = PAGE_SIZE >> (PAGE_SHIFT - blockshift);
577 # endif
578 #endif
579
580 return (((__uint64_t)pagefactor) << bitshift) - 1;
581 }
582
583 /*
584 * Set parameters for inode allocation heuristics, taking into account
585 * filesystem size and inode32/inode64 mount options; i.e. specifically
586 * whether or not XFS_MOUNT_SMALL_INUMS is set.
587 *
588 * Inode allocation patterns are altered only if inode32 is requested
589 * (XFS_MOUNT_SMALL_INUMS), and the filesystem is sufficiently large.
590 * If altered, XFS_MOUNT_32BITINODES is set as well.
591 *
592 * An agcount independent of that in the mount structure is provided
593 * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
594 * to the potentially higher ag count.
595 *
596 * Returns the maximum AG index which may contain inodes.
597 */
598 xfs_agnumber_t
599 xfs_set_inode_alloc(
600 struct xfs_mount *mp,
601 xfs_agnumber_t agcount)
602 {
603 xfs_agnumber_t index;
604 xfs_agnumber_t maxagi = 0;
605 xfs_sb_t *sbp = &mp->m_sb;
606 xfs_agnumber_t max_metadata;
607 xfs_agino_t agino;
608 xfs_ino_t ino;
609
610 /*
611 * Calculate how much should be reserved for inodes to meet
612 * the max inode percentage. Used only for inode32.
613 */
614 if (mp->m_maxicount) {
615 __uint64_t icount;
616
617 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
618 do_div(icount, 100);
619 icount += sbp->sb_agblocks - 1;
620 do_div(icount, sbp->sb_agblocks);
621 max_metadata = icount;
622 } else {
623 max_metadata = agcount;
624 }
625
626 /* Get the last possible inode in the filesystem */
627 agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
628 ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
629
630 /*
631 * If user asked for no more than 32-bit inodes, and the fs is
632 * sufficiently large, set XFS_MOUNT_32BITINODES if we must alter
633 * the allocator to accommodate the request.
634 */
635 if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32)
636 mp->m_flags |= XFS_MOUNT_32BITINODES;
637 else
638 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
639
640 for (index = 0; index < agcount; index++) {
641 struct xfs_perag *pag;
642
643 ino = XFS_AGINO_TO_INO(mp, index, agino);
644
645 pag = xfs_perag_get(mp, index);
646
647 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
648 if (ino > XFS_MAXINUMBER_32) {
649 pag->pagi_inodeok = 0;
650 pag->pagf_metadata = 0;
651 } else {
652 pag->pagi_inodeok = 1;
653 maxagi++;
654 if (index < max_metadata)
655 pag->pagf_metadata = 1;
656 else
657 pag->pagf_metadata = 0;
658 }
659 } else {
660 pag->pagi_inodeok = 1;
661 pag->pagf_metadata = 0;
662 }
663
664 xfs_perag_put(pag);
665 }
666
667 return (mp->m_flags & XFS_MOUNT_32BITINODES) ? maxagi : agcount;
668 }
669
670 STATIC int
671 xfs_blkdev_get(
672 xfs_mount_t *mp,
673 const char *name,
674 struct block_device **bdevp)
675 {
676 int error = 0;
677
678 *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
679 mp);
680 if (IS_ERR(*bdevp)) {
681 error = PTR_ERR(*bdevp);
682 xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
683 }
684
685 return error;
686 }
687
688 STATIC void
689 xfs_blkdev_put(
690 struct block_device *bdev)
691 {
692 if (bdev)
693 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
694 }
695
696 void
697 xfs_blkdev_issue_flush(
698 xfs_buftarg_t *buftarg)
699 {
700 blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
701 }
702
703 STATIC void
704 xfs_close_devices(
705 struct xfs_mount *mp)
706 {
707 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
708 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
709 xfs_free_buftarg(mp, mp->m_logdev_targp);
710 xfs_blkdev_put(logdev);
711 }
712 if (mp->m_rtdev_targp) {
713 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
714 xfs_free_buftarg(mp, mp->m_rtdev_targp);
715 xfs_blkdev_put(rtdev);
716 }
717 xfs_free_buftarg(mp, mp->m_ddev_targp);
718 }
719
720 /*
721 * The file system configurations are:
722 * (1) device (partition) with data and internal log
723 * (2) logical volume with data and log subvolumes.
724 * (3) logical volume with data, log, and realtime subvolumes.
725 *
726 * We only have to handle opening the log and realtime volumes here if
727 * they are present. The data subvolume has already been opened by
728 * get_sb_bdev() and is stored in sb->s_bdev.
729 */
730 STATIC int
731 xfs_open_devices(
732 struct xfs_mount *mp)
733 {
734 struct block_device *ddev = mp->m_super->s_bdev;
735 struct block_device *logdev = NULL, *rtdev = NULL;
736 int error;
737
738 /*
739 * Open real time and log devices - order is important.
740 */
741 if (mp->m_logname) {
742 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
743 if (error)
744 goto out;
745 }
746
747 if (mp->m_rtname) {
748 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
749 if (error)
750 goto out_close_logdev;
751
752 if (rtdev == ddev || rtdev == logdev) {
753 xfs_warn(mp,
754 "Cannot mount filesystem with identical rtdev and ddev/logdev.");
755 error = -EINVAL;
756 goto out_close_rtdev;
757 }
758 }
759
760 /*
761 * Setup xfs_mount buffer target pointers
762 */
763 error = -ENOMEM;
764 mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev);
765 if (!mp->m_ddev_targp)
766 goto out_close_rtdev;
767
768 if (rtdev) {
769 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev);
770 if (!mp->m_rtdev_targp)
771 goto out_free_ddev_targ;
772 }
773
774 if (logdev && logdev != ddev) {
775 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev);
776 if (!mp->m_logdev_targp)
777 goto out_free_rtdev_targ;
778 } else {
779 mp->m_logdev_targp = mp->m_ddev_targp;
780 }
781
782 return 0;
783
784 out_free_rtdev_targ:
785 if (mp->m_rtdev_targp)
786 xfs_free_buftarg(mp, mp->m_rtdev_targp);
787 out_free_ddev_targ:
788 xfs_free_buftarg(mp, mp->m_ddev_targp);
789 out_close_rtdev:
790 xfs_blkdev_put(rtdev);
791 out_close_logdev:
792 if (logdev && logdev != ddev)
793 xfs_blkdev_put(logdev);
794 out:
795 return error;
796 }
797
798 /*
799 * Setup xfs_mount buffer target pointers based on superblock
800 */
801 STATIC int
802 xfs_setup_devices(
803 struct xfs_mount *mp)
804 {
805 int error;
806
807 error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
808 if (error)
809 return error;
810
811 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
812 unsigned int log_sector_size = BBSIZE;
813
814 if (xfs_sb_version_hassector(&mp->m_sb))
815 log_sector_size = mp->m_sb.sb_logsectsize;
816 error = xfs_setsize_buftarg(mp->m_logdev_targp,
817 log_sector_size);
818 if (error)
819 return error;
820 }
821 if (mp->m_rtdev_targp) {
822 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
823 mp->m_sb.sb_sectsize);
824 if (error)
825 return error;
826 }
827
828 return 0;
829 }
830
831 STATIC int
832 xfs_init_mount_workqueues(
833 struct xfs_mount *mp)
834 {
835 mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
836 WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_fsname);
837 if (!mp->m_buf_workqueue)
838 goto out;
839
840 mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
841 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
842 if (!mp->m_data_workqueue)
843 goto out_destroy_buf;
844
845 mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
846 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
847 if (!mp->m_unwritten_workqueue)
848 goto out_destroy_data_iodone_queue;
849
850 mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
851 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
852 if (!mp->m_cil_workqueue)
853 goto out_destroy_unwritten;
854
855 mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
856 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
857 if (!mp->m_reclaim_workqueue)
858 goto out_destroy_cil;
859
860 mp->m_log_workqueue = alloc_workqueue("xfs-log/%s",
861 WQ_MEM_RECLAIM|WQ_FREEZABLE|WQ_HIGHPRI, 0,
862 mp->m_fsname);
863 if (!mp->m_log_workqueue)
864 goto out_destroy_reclaim;
865
866 mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
867 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
868 if (!mp->m_eofblocks_workqueue)
869 goto out_destroy_log;
870
871 return 0;
872
873 out_destroy_log:
874 destroy_workqueue(mp->m_log_workqueue);
875 out_destroy_reclaim:
876 destroy_workqueue(mp->m_reclaim_workqueue);
877 out_destroy_cil:
878 destroy_workqueue(mp->m_cil_workqueue);
879 out_destroy_unwritten:
880 destroy_workqueue(mp->m_unwritten_workqueue);
881 out_destroy_data_iodone_queue:
882 destroy_workqueue(mp->m_data_workqueue);
883 out_destroy_buf:
884 destroy_workqueue(mp->m_buf_workqueue);
885 out:
886 return -ENOMEM;
887 }
888
889 STATIC void
890 xfs_destroy_mount_workqueues(
891 struct xfs_mount *mp)
892 {
893 destroy_workqueue(mp->m_eofblocks_workqueue);
894 destroy_workqueue(mp->m_log_workqueue);
895 destroy_workqueue(mp->m_reclaim_workqueue);
896 destroy_workqueue(mp->m_cil_workqueue);
897 destroy_workqueue(mp->m_data_workqueue);
898 destroy_workqueue(mp->m_unwritten_workqueue);
899 destroy_workqueue(mp->m_buf_workqueue);
900 }
901
902 /*
903 * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
904 * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
905 * for IO to complete so that we effectively throttle multiple callers to the
906 * rate at which IO is completing.
907 */
908 void
909 xfs_flush_inodes(
910 struct xfs_mount *mp)
911 {
912 struct super_block *sb = mp->m_super;
913
914 if (down_read_trylock(&sb->s_umount)) {
915 sync_inodes_sb(sb);
916 up_read(&sb->s_umount);
917 }
918 }
919
920 /* Catch misguided souls that try to use this interface on XFS */
921 STATIC struct inode *
922 xfs_fs_alloc_inode(
923 struct super_block *sb)
924 {
925 BUG();
926 return NULL;
927 }
928
929 /*
930 * Now that the generic code is guaranteed not to be accessing
931 * the linux inode, we can inactivate and reclaim the inode.
932 */
933 STATIC void
934 xfs_fs_destroy_inode(
935 struct inode *inode)
936 {
937 struct xfs_inode *ip = XFS_I(inode);
938
939 trace_xfs_destroy_inode(ip);
940
941 ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
942 XFS_STATS_INC(ip->i_mount, vn_rele);
943 XFS_STATS_INC(ip->i_mount, vn_remove);
944
945 xfs_inactive(ip);
946
947 ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
948 XFS_STATS_INC(ip->i_mount, vn_reclaim);
949
950 /*
951 * We should never get here with one of the reclaim flags already set.
952 */
953 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
954 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
955
956 /*
957 * We always use background reclaim here because even if the
958 * inode is clean, it still may be under IO and hence we have
959 * to take the flush lock. The background reclaim path handles
960 * this more efficiently than we can here, so simply let background
961 * reclaim tear down all inodes.
962 */
963 xfs_inode_set_reclaim_tag(ip);
964 }
965
966 /*
967 * Slab object creation initialisation for the XFS inode.
968 * This covers only the idempotent fields in the XFS inode;
969 * all other fields need to be initialised on allocation
970 * from the slab. This avoids the need to repeatedly initialise
971 * fields in the xfs inode that left in the initialise state
972 * when freeing the inode.
973 */
974 STATIC void
975 xfs_fs_inode_init_once(
976 void *inode)
977 {
978 struct xfs_inode *ip = inode;
979
980 memset(ip, 0, sizeof(struct xfs_inode));
981
982 /* vfs inode */
983 inode_init_once(VFS_I(ip));
984
985 /* xfs inode */
986 atomic_set(&ip->i_pincount, 0);
987 spin_lock_init(&ip->i_flags_lock);
988
989 mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
990 "xfsino", ip->i_ino);
991 mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
992 "xfsino", ip->i_ino);
993 }
994
995 /*
996 * We do an unlocked check for XFS_IDONTCACHE here because we are already
997 * serialised against cache hits here via the inode->i_lock and igrab() in
998 * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
999 * racing with us, and it avoids needing to grab a spinlock here for every inode
1000 * we drop the final reference on.
1001 */
1002 STATIC int
1003 xfs_fs_drop_inode(
1004 struct inode *inode)
1005 {
1006 struct xfs_inode *ip = XFS_I(inode);
1007
1008 return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1009 }
1010
1011 STATIC void
1012 xfs_free_fsname(
1013 struct xfs_mount *mp)
1014 {
1015 kfree(mp->m_fsname);
1016 kfree(mp->m_rtname);
1017 kfree(mp->m_logname);
1018 }
1019
1020 STATIC int
1021 xfs_fs_sync_fs(
1022 struct super_block *sb,
1023 int wait)
1024 {
1025 struct xfs_mount *mp = XFS_M(sb);
1026
1027 /*
1028 * Doing anything during the async pass would be counterproductive.
1029 */
1030 if (!wait)
1031 return 0;
1032
1033 xfs_log_force(mp, XFS_LOG_SYNC);
1034 if (laptop_mode) {
1035 /*
1036 * The disk must be active because we're syncing.
1037 * We schedule log work now (now that the disk is
1038 * active) instead of later (when it might not be).
1039 */
1040 flush_delayed_work(&mp->m_log->l_work);
1041 }
1042
1043 return 0;
1044 }
1045
1046 STATIC int
1047 xfs_fs_statfs(
1048 struct dentry *dentry,
1049 struct kstatfs *statp)
1050 {
1051 struct xfs_mount *mp = XFS_M(dentry->d_sb);
1052 xfs_sb_t *sbp = &mp->m_sb;
1053 struct xfs_inode *ip = XFS_I(d_inode(dentry));
1054 __uint64_t fakeinos, id;
1055 __uint64_t icount;
1056 __uint64_t ifree;
1057 __uint64_t fdblocks;
1058 xfs_extlen_t lsize;
1059 __int64_t ffree;
1060
1061 statp->f_type = XFS_SB_MAGIC;
1062 statp->f_namelen = MAXNAMELEN - 1;
1063
1064 id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1065 statp->f_fsid.val[0] = (u32)id;
1066 statp->f_fsid.val[1] = (u32)(id >> 32);
1067
1068 icount = percpu_counter_sum(&mp->m_icount);
1069 ifree = percpu_counter_sum(&mp->m_ifree);
1070 fdblocks = percpu_counter_sum(&mp->m_fdblocks);
1071
1072 spin_lock(&mp->m_sb_lock);
1073 statp->f_bsize = sbp->sb_blocksize;
1074 lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1075 statp->f_blocks = sbp->sb_dblocks - lsize;
1076 spin_unlock(&mp->m_sb_lock);
1077
1078 statp->f_bfree = fdblocks - XFS_ALLOC_SET_ASIDE(mp);
1079 statp->f_bavail = statp->f_bfree;
1080
1081 fakeinos = statp->f_bfree << sbp->sb_inopblog;
1082 statp->f_files = MIN(icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
1083 if (mp->m_maxicount)
1084 statp->f_files = min_t(typeof(statp->f_files),
1085 statp->f_files,
1086 mp->m_maxicount);
1087
1088 /* If sb_icount overshot maxicount, report actual allocation */
1089 statp->f_files = max_t(typeof(statp->f_files),
1090 statp->f_files,
1091 sbp->sb_icount);
1092
1093 /* make sure statp->f_ffree does not underflow */
1094 ffree = statp->f_files - (icount - ifree);
1095 statp->f_ffree = max_t(__int64_t, ffree, 0);
1096
1097
1098 if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1099 ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1100 (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1101 xfs_qm_statvfs(ip, statp);
1102 return 0;
1103 }
1104
1105 STATIC void
1106 xfs_save_resvblks(struct xfs_mount *mp)
1107 {
1108 __uint64_t resblks = 0;
1109
1110 mp->m_resblks_save = mp->m_resblks;
1111 xfs_reserve_blocks(mp, &resblks, NULL);
1112 }
1113
1114 STATIC void
1115 xfs_restore_resvblks(struct xfs_mount *mp)
1116 {
1117 __uint64_t resblks;
1118
1119 if (mp->m_resblks_save) {
1120 resblks = mp->m_resblks_save;
1121 mp->m_resblks_save = 0;
1122 } else
1123 resblks = xfs_default_resblks(mp);
1124
1125 xfs_reserve_blocks(mp, &resblks, NULL);
1126 }
1127
1128 /*
1129 * Trigger writeback of all the dirty metadata in the file system.
1130 *
1131 * This ensures that the metadata is written to their location on disk rather
1132 * than just existing in transactions in the log. This means after a quiesce
1133 * there is no log replay required to write the inodes to disk - this is the
1134 * primary difference between a sync and a quiesce.
1135 *
1136 * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1137 * it is started again when appropriate.
1138 */
1139 static void
1140 xfs_quiesce_attr(
1141 struct xfs_mount *mp)
1142 {
1143 int error = 0;
1144
1145 /* wait for all modifications to complete */
1146 while (atomic_read(&mp->m_active_trans) > 0)
1147 delay(100);
1148
1149 /* force the log to unpin objects from the now complete transactions */
1150 xfs_log_force(mp, XFS_LOG_SYNC);
1151
1152 /* reclaim inodes to do any IO before the freeze completes */
1153 xfs_reclaim_inodes(mp, 0);
1154 xfs_reclaim_inodes(mp, SYNC_WAIT);
1155
1156 /* Push the superblock and write an unmount record */
1157 error = xfs_log_sbcount(mp);
1158 if (error)
1159 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1160 "Frozen image may not be consistent.");
1161 /*
1162 * Just warn here till VFS can correctly support
1163 * read-only remount without racing.
1164 */
1165 WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1166
1167 xfs_log_quiesce(mp);
1168 }
1169
1170 STATIC int
1171 xfs_test_remount_options(
1172 struct super_block *sb,
1173 struct xfs_mount *mp,
1174 char *options)
1175 {
1176 int error = 0;
1177 struct xfs_mount *tmp_mp;
1178
1179 tmp_mp = kmem_zalloc(sizeof(*tmp_mp), KM_MAYFAIL);
1180 if (!tmp_mp)
1181 return -ENOMEM;
1182
1183 tmp_mp->m_super = sb;
1184 error = xfs_parseargs(tmp_mp, options);
1185 xfs_free_fsname(tmp_mp);
1186 kfree(tmp_mp);
1187
1188 return error;
1189 }
1190
1191 STATIC int
1192 xfs_fs_remount(
1193 struct super_block *sb,
1194 int *flags,
1195 char *options)
1196 {
1197 struct xfs_mount *mp = XFS_M(sb);
1198 xfs_sb_t *sbp = &mp->m_sb;
1199 substring_t args[MAX_OPT_ARGS];
1200 char *p;
1201 int error;
1202
1203 /* First, check for complete junk; i.e. invalid options */
1204 error = xfs_test_remount_options(sb, mp, options);
1205 if (error)
1206 return error;
1207
1208 sync_filesystem(sb);
1209 while ((p = strsep(&options, ",")) != NULL) {
1210 int token;
1211
1212 if (!*p)
1213 continue;
1214
1215 token = match_token(p, tokens, args);
1216 switch (token) {
1217 case Opt_barrier:
1218 mp->m_flags |= XFS_MOUNT_BARRIER;
1219 break;
1220 case Opt_nobarrier:
1221 mp->m_flags &= ~XFS_MOUNT_BARRIER;
1222 break;
1223 case Opt_inode64:
1224 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1225 mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1226 break;
1227 case Opt_inode32:
1228 mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1229 mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1230 break;
1231 default:
1232 /*
1233 * Logically we would return an error here to prevent
1234 * users from believing they might have changed
1235 * mount options using remount which can't be changed.
1236 *
1237 * But unfortunately mount(8) adds all options from
1238 * mtab and fstab to the mount arguments in some cases
1239 * so we can't blindly reject options, but have to
1240 * check for each specified option if it actually
1241 * differs from the currently set option and only
1242 * reject it if that's the case.
1243 *
1244 * Until that is implemented we return success for
1245 * every remount request, and silently ignore all
1246 * options that we can't actually change.
1247 */
1248 #if 0
1249 xfs_info(mp,
1250 "mount option \"%s\" not supported for remount", p);
1251 return -EINVAL;
1252 #else
1253 break;
1254 #endif
1255 }
1256 }
1257
1258 /* ro -> rw */
1259 if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
1260 if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1261 xfs_warn(mp,
1262 "ro->rw transition prohibited on norecovery mount");
1263 return -EINVAL;
1264 }
1265
1266 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
1267 xfs_sb_has_ro_compat_feature(sbp,
1268 XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1269 xfs_warn(mp,
1270 "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1271 (sbp->sb_features_ro_compat &
1272 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1273 return -EINVAL;
1274 }
1275
1276 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1277
1278 /*
1279 * If this is the first remount to writeable state we
1280 * might have some superblock changes to update.
1281 */
1282 if (mp->m_update_sb) {
1283 error = xfs_sync_sb(mp, false);
1284 if (error) {
1285 xfs_warn(mp, "failed to write sb changes");
1286 return error;
1287 }
1288 mp->m_update_sb = false;
1289 }
1290
1291 /*
1292 * Fill out the reserve pool if it is empty. Use the stashed
1293 * value if it is non-zero, otherwise go with the default.
1294 */
1295 xfs_restore_resvblks(mp);
1296 xfs_log_work_queue(mp);
1297 xfs_queue_eofblocks(mp);
1298 }
1299
1300 /* rw -> ro */
1301 if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
1302 /*
1303 * Before we sync the metadata, we need to free up the reserve
1304 * block pool so that the used block count in the superblock on
1305 * disk is correct at the end of the remount. Stash the current
1306 * reserve pool size so that if we get remounted rw, we can
1307 * return it to the same size.
1308 */
1309 xfs_save_resvblks(mp);
1310
1311 /*
1312 * Cancel background eofb scanning so it cannot race with the
1313 * final log force+buftarg wait and deadlock the remount.
1314 */
1315 cancel_delayed_work_sync(&mp->m_eofblocks_work);
1316
1317 xfs_quiesce_attr(mp);
1318 mp->m_flags |= XFS_MOUNT_RDONLY;
1319 }
1320
1321 return 0;
1322 }
1323
1324 /*
1325 * Second stage of a freeze. The data is already frozen so we only
1326 * need to take care of the metadata. Once that's done sync the superblock
1327 * to the log to dirty it in case of a crash while frozen. This ensures that we
1328 * will recover the unlinked inode lists on the next mount.
1329 */
1330 STATIC int
1331 xfs_fs_freeze(
1332 struct super_block *sb)
1333 {
1334 struct xfs_mount *mp = XFS_M(sb);
1335
1336 xfs_save_resvblks(mp);
1337 xfs_quiesce_attr(mp);
1338 return xfs_sync_sb(mp, true);
1339 }
1340
1341 STATIC int
1342 xfs_fs_unfreeze(
1343 struct super_block *sb)
1344 {
1345 struct xfs_mount *mp = XFS_M(sb);
1346
1347 xfs_restore_resvblks(mp);
1348 xfs_log_work_queue(mp);
1349 return 0;
1350 }
1351
1352 STATIC int
1353 xfs_fs_show_options(
1354 struct seq_file *m,
1355 struct dentry *root)
1356 {
1357 return xfs_showargs(XFS_M(root->d_sb), m);
1358 }
1359
1360 /*
1361 * This function fills in xfs_mount_t fields based on mount args.
1362 * Note: the superblock _has_ now been read in.
1363 */
1364 STATIC int
1365 xfs_finish_flags(
1366 struct xfs_mount *mp)
1367 {
1368 int ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1369
1370 /* Fail a mount where the logbuf is smaller than the log stripe */
1371 if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1372 if (mp->m_logbsize <= 0 &&
1373 mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1374 mp->m_logbsize = mp->m_sb.sb_logsunit;
1375 } else if (mp->m_logbsize > 0 &&
1376 mp->m_logbsize < mp->m_sb.sb_logsunit) {
1377 xfs_warn(mp,
1378 "logbuf size must be greater than or equal to log stripe size");
1379 return -EINVAL;
1380 }
1381 } else {
1382 /* Fail a mount if the logbuf is larger than 32K */
1383 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1384 xfs_warn(mp,
1385 "logbuf size for version 1 logs must be 16K or 32K");
1386 return -EINVAL;
1387 }
1388 }
1389
1390 /*
1391 * V5 filesystems always use attr2 format for attributes.
1392 */
1393 if (xfs_sb_version_hascrc(&mp->m_sb) &&
1394 (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1395 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
1396 "attr2 is always enabled for V5 filesystems.");
1397 return -EINVAL;
1398 }
1399
1400 /*
1401 * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1402 * told by noattr2 to turn it off
1403 */
1404 if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1405 !(mp->m_flags & XFS_MOUNT_NOATTR2))
1406 mp->m_flags |= XFS_MOUNT_ATTR2;
1407
1408 /*
1409 * prohibit r/w mounts of read-only filesystems
1410 */
1411 if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1412 xfs_warn(mp,
1413 "cannot mount a read-only filesystem as read-write");
1414 return -EROFS;
1415 }
1416
1417 if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1418 (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1419 !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1420 xfs_warn(mp,
1421 "Super block does not support project and group quota together");
1422 return -EINVAL;
1423 }
1424
1425 return 0;
1426 }
1427
1428 static int
1429 xfs_init_percpu_counters(
1430 struct xfs_mount *mp)
1431 {
1432 int error;
1433
1434 error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1435 if (error)
1436 return -ENOMEM;
1437
1438 error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1439 if (error)
1440 goto free_icount;
1441
1442 error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1443 if (error)
1444 goto free_ifree;
1445
1446 return 0;
1447
1448 free_ifree:
1449 percpu_counter_destroy(&mp->m_ifree);
1450 free_icount:
1451 percpu_counter_destroy(&mp->m_icount);
1452 return -ENOMEM;
1453 }
1454
1455 void
1456 xfs_reinit_percpu_counters(
1457 struct xfs_mount *mp)
1458 {
1459 percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1460 percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1461 percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1462 }
1463
1464 static void
1465 xfs_destroy_percpu_counters(
1466 struct xfs_mount *mp)
1467 {
1468 percpu_counter_destroy(&mp->m_icount);
1469 percpu_counter_destroy(&mp->m_ifree);
1470 percpu_counter_destroy(&mp->m_fdblocks);
1471 }
1472
1473 STATIC int
1474 xfs_fs_fill_super(
1475 struct super_block *sb,
1476 void *data,
1477 int silent)
1478 {
1479 struct inode *root;
1480 struct xfs_mount *mp = NULL;
1481 int flags = 0, error = -ENOMEM;
1482
1483 mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1484 if (!mp)
1485 goto out;
1486
1487 spin_lock_init(&mp->m_sb_lock);
1488 mutex_init(&mp->m_growlock);
1489 atomic_set(&mp->m_active_trans, 0);
1490 INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1491 INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1492 mp->m_kobj.kobject.kset = xfs_kset;
1493
1494 mp->m_super = sb;
1495 sb->s_fs_info = mp;
1496
1497 error = xfs_parseargs(mp, (char *)data);
1498 if (error)
1499 goto out_free_fsname;
1500
1501 sb_min_blocksize(sb, BBSIZE);
1502 sb->s_xattr = xfs_xattr_handlers;
1503 sb->s_export_op = &xfs_export_operations;
1504 #ifdef CONFIG_XFS_QUOTA
1505 sb->s_qcop = &xfs_quotactl_operations;
1506 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1507 #endif
1508 sb->s_op = &xfs_super_operations;
1509
1510 if (silent)
1511 flags |= XFS_MFSI_QUIET;
1512
1513 error = xfs_open_devices(mp);
1514 if (error)
1515 goto out_free_fsname;
1516
1517 error = xfs_init_mount_workqueues(mp);
1518 if (error)
1519 goto out_close_devices;
1520
1521 error = xfs_init_percpu_counters(mp);
1522 if (error)
1523 goto out_destroy_workqueues;
1524
1525 /* Allocate stats memory before we do operations that might use it */
1526 mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1527 if (!mp->m_stats.xs_stats) {
1528 error = -ENOMEM;
1529 goto out_destroy_counters;
1530 }
1531
1532 error = xfs_readsb(mp, flags);
1533 if (error)
1534 goto out_free_stats;
1535
1536 error = xfs_finish_flags(mp);
1537 if (error)
1538 goto out_free_sb;
1539
1540 error = xfs_setup_devices(mp);
1541 if (error)
1542 goto out_free_sb;
1543
1544 error = xfs_filestream_mount(mp);
1545 if (error)
1546 goto out_free_sb;
1547
1548 /*
1549 * we must configure the block size in the superblock before we run the
1550 * full mount process as the mount process can lookup and cache inodes.
1551 */
1552 sb->s_magic = XFS_SB_MAGIC;
1553 sb->s_blocksize = mp->m_sb.sb_blocksize;
1554 sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1555 sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1556 sb->s_max_links = XFS_MAXLINK;
1557 sb->s_time_gran = 1;
1558 set_posix_acl_flag(sb);
1559
1560 /* version 5 superblocks support inode version counters. */
1561 if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1562 sb->s_flags |= MS_I_VERSION;
1563
1564 if (mp->m_flags & XFS_MOUNT_DAX) {
1565 xfs_warn(mp,
1566 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1567
1568 error = bdev_dax_supported(sb, sb->s_blocksize);
1569 if (error) {
1570 xfs_alert(mp,
1571 "DAX unsupported by block device. Turning off DAX.");
1572 mp->m_flags &= ~XFS_MOUNT_DAX;
1573 }
1574 }
1575
1576 error = xfs_mountfs(mp);
1577 if (error)
1578 goto out_filestream_unmount;
1579
1580 root = igrab(VFS_I(mp->m_rootip));
1581 if (!root) {
1582 error = -ENOENT;
1583 goto out_unmount;
1584 }
1585 sb->s_root = d_make_root(root);
1586 if (!sb->s_root) {
1587 error = -ENOMEM;
1588 goto out_unmount;
1589 }
1590
1591 return 0;
1592
1593 out_filestream_unmount:
1594 xfs_filestream_unmount(mp);
1595 out_free_sb:
1596 xfs_freesb(mp);
1597 out_free_stats:
1598 free_percpu(mp->m_stats.xs_stats);
1599 out_destroy_counters:
1600 xfs_destroy_percpu_counters(mp);
1601 out_destroy_workqueues:
1602 xfs_destroy_mount_workqueues(mp);
1603 out_close_devices:
1604 xfs_close_devices(mp);
1605 out_free_fsname:
1606 xfs_free_fsname(mp);
1607 kfree(mp);
1608 out:
1609 return error;
1610
1611 out_unmount:
1612 xfs_filestream_unmount(mp);
1613 xfs_unmountfs(mp);
1614 goto out_free_sb;
1615 }
1616
1617 STATIC void
1618 xfs_fs_put_super(
1619 struct super_block *sb)
1620 {
1621 struct xfs_mount *mp = XFS_M(sb);
1622
1623 xfs_notice(mp, "Unmounting Filesystem");
1624 xfs_filestream_unmount(mp);
1625 xfs_unmountfs(mp);
1626
1627 xfs_freesb(mp);
1628 free_percpu(mp->m_stats.xs_stats);
1629 xfs_destroy_percpu_counters(mp);
1630 xfs_destroy_mount_workqueues(mp);
1631 xfs_close_devices(mp);
1632 xfs_free_fsname(mp);
1633 kfree(mp);
1634 }
1635
1636 STATIC struct dentry *
1637 xfs_fs_mount(
1638 struct file_system_type *fs_type,
1639 int flags,
1640 const char *dev_name,
1641 void *data)
1642 {
1643 return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1644 }
1645
1646 static long
1647 xfs_fs_nr_cached_objects(
1648 struct super_block *sb,
1649 struct shrink_control *sc)
1650 {
1651 return xfs_reclaim_inodes_count(XFS_M(sb));
1652 }
1653
1654 static long
1655 xfs_fs_free_cached_objects(
1656 struct super_block *sb,
1657 struct shrink_control *sc)
1658 {
1659 return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1660 }
1661
1662 static const struct super_operations xfs_super_operations = {
1663 .alloc_inode = xfs_fs_alloc_inode,
1664 .destroy_inode = xfs_fs_destroy_inode,
1665 .drop_inode = xfs_fs_drop_inode,
1666 .put_super = xfs_fs_put_super,
1667 .sync_fs = xfs_fs_sync_fs,
1668 .freeze_fs = xfs_fs_freeze,
1669 .unfreeze_fs = xfs_fs_unfreeze,
1670 .statfs = xfs_fs_statfs,
1671 .remount_fs = xfs_fs_remount,
1672 .show_options = xfs_fs_show_options,
1673 .nr_cached_objects = xfs_fs_nr_cached_objects,
1674 .free_cached_objects = xfs_fs_free_cached_objects,
1675 };
1676
1677 static struct file_system_type xfs_fs_type = {
1678 .owner = THIS_MODULE,
1679 .name = "xfs",
1680 .mount = xfs_fs_mount,
1681 .kill_sb = kill_block_super,
1682 .fs_flags = FS_REQUIRES_DEV,
1683 };
1684 MODULE_ALIAS_FS("xfs");
1685
1686 STATIC int __init
1687 xfs_init_zones(void)
1688 {
1689 xfs_ioend_bioset = bioset_create(4 * MAX_BUF_PER_PAGE,
1690 offsetof(struct xfs_ioend, io_inline_bio));
1691 if (!xfs_ioend_bioset)
1692 goto out;
1693
1694 xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1695 "xfs_log_ticket");
1696 if (!xfs_log_ticket_zone)
1697 goto out_free_ioend_bioset;
1698
1699 xfs_bmap_free_item_zone = kmem_zone_init(
1700 sizeof(struct xfs_bmap_free_item),
1701 "xfs_bmap_free_item");
1702 if (!xfs_bmap_free_item_zone)
1703 goto out_destroy_log_ticket_zone;
1704
1705 xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1706 "xfs_btree_cur");
1707 if (!xfs_btree_cur_zone)
1708 goto out_destroy_bmap_free_item_zone;
1709
1710 xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1711 "xfs_da_state");
1712 if (!xfs_da_state_zone)
1713 goto out_destroy_btree_cur_zone;
1714
1715 xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1716 if (!xfs_ifork_zone)
1717 goto out_destroy_da_state_zone;
1718
1719 xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1720 if (!xfs_trans_zone)
1721 goto out_destroy_ifork_zone;
1722
1723 xfs_log_item_desc_zone =
1724 kmem_zone_init(sizeof(struct xfs_log_item_desc),
1725 "xfs_log_item_desc");
1726 if (!xfs_log_item_desc_zone)
1727 goto out_destroy_trans_zone;
1728
1729 /*
1730 * The size of the zone allocated buf log item is the maximum
1731 * size possible under XFS. This wastes a little bit of memory,
1732 * but it is much faster.
1733 */
1734 xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1735 "xfs_buf_item");
1736 if (!xfs_buf_item_zone)
1737 goto out_destroy_log_item_desc_zone;
1738
1739 xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1740 ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1741 sizeof(xfs_extent_t))), "xfs_efd_item");
1742 if (!xfs_efd_zone)
1743 goto out_destroy_buf_item_zone;
1744
1745 xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1746 ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1747 sizeof(xfs_extent_t))), "xfs_efi_item");
1748 if (!xfs_efi_zone)
1749 goto out_destroy_efd_zone;
1750
1751 xfs_inode_zone =
1752 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1753 KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD |
1754 KM_ZONE_ACCOUNT, xfs_fs_inode_init_once);
1755 if (!xfs_inode_zone)
1756 goto out_destroy_efi_zone;
1757
1758 xfs_ili_zone =
1759 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1760 KM_ZONE_SPREAD, NULL);
1761 if (!xfs_ili_zone)
1762 goto out_destroy_inode_zone;
1763 xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1764 "xfs_icr");
1765 if (!xfs_icreate_zone)
1766 goto out_destroy_ili_zone;
1767
1768 return 0;
1769
1770 out_destroy_ili_zone:
1771 kmem_zone_destroy(xfs_ili_zone);
1772 out_destroy_inode_zone:
1773 kmem_zone_destroy(xfs_inode_zone);
1774 out_destroy_efi_zone:
1775 kmem_zone_destroy(xfs_efi_zone);
1776 out_destroy_efd_zone:
1777 kmem_zone_destroy(xfs_efd_zone);
1778 out_destroy_buf_item_zone:
1779 kmem_zone_destroy(xfs_buf_item_zone);
1780 out_destroy_log_item_desc_zone:
1781 kmem_zone_destroy(xfs_log_item_desc_zone);
1782 out_destroy_trans_zone:
1783 kmem_zone_destroy(xfs_trans_zone);
1784 out_destroy_ifork_zone:
1785 kmem_zone_destroy(xfs_ifork_zone);
1786 out_destroy_da_state_zone:
1787 kmem_zone_destroy(xfs_da_state_zone);
1788 out_destroy_btree_cur_zone:
1789 kmem_zone_destroy(xfs_btree_cur_zone);
1790 out_destroy_bmap_free_item_zone:
1791 kmem_zone_destroy(xfs_bmap_free_item_zone);
1792 out_destroy_log_ticket_zone:
1793 kmem_zone_destroy(xfs_log_ticket_zone);
1794 out_free_ioend_bioset:
1795 bioset_free(xfs_ioend_bioset);
1796 out:
1797 return -ENOMEM;
1798 }
1799
1800 STATIC void
1801 xfs_destroy_zones(void)
1802 {
1803 /*
1804 * Make sure all delayed rcu free are flushed before we
1805 * destroy caches.
1806 */
1807 rcu_barrier();
1808 kmem_zone_destroy(xfs_icreate_zone);
1809 kmem_zone_destroy(xfs_ili_zone);
1810 kmem_zone_destroy(xfs_inode_zone);
1811 kmem_zone_destroy(xfs_efi_zone);
1812 kmem_zone_destroy(xfs_efd_zone);
1813 kmem_zone_destroy(xfs_buf_item_zone);
1814 kmem_zone_destroy(xfs_log_item_desc_zone);
1815 kmem_zone_destroy(xfs_trans_zone);
1816 kmem_zone_destroy(xfs_ifork_zone);
1817 kmem_zone_destroy(xfs_da_state_zone);
1818 kmem_zone_destroy(xfs_btree_cur_zone);
1819 kmem_zone_destroy(xfs_bmap_free_item_zone);
1820 kmem_zone_destroy(xfs_log_ticket_zone);
1821 bioset_free(xfs_ioend_bioset);
1822 }
1823
1824 STATIC int __init
1825 xfs_init_workqueues(void)
1826 {
1827 /*
1828 * The allocation workqueue can be used in memory reclaim situations
1829 * (writepage path), and parallelism is only limited by the number of
1830 * AGs in all the filesystems mounted. Hence use the default large
1831 * max_active value for this workqueue.
1832 */
1833 xfs_alloc_wq = alloc_workqueue("xfsalloc",
1834 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
1835 if (!xfs_alloc_wq)
1836 return -ENOMEM;
1837
1838 return 0;
1839 }
1840
1841 STATIC void
1842 xfs_destroy_workqueues(void)
1843 {
1844 destroy_workqueue(xfs_alloc_wq);
1845 }
1846
1847 STATIC int __init
1848 init_xfs_fs(void)
1849 {
1850 int error;
1851
1852 xfs_check_ondisk_structs();
1853
1854 printk(KERN_INFO XFS_VERSION_STRING " with "
1855 XFS_BUILD_OPTIONS " enabled\n");
1856
1857 xfs_dir_startup();
1858
1859 error = xfs_init_zones();
1860 if (error)
1861 goto out;
1862
1863 error = xfs_init_workqueues();
1864 if (error)
1865 goto out_destroy_zones;
1866
1867 error = xfs_mru_cache_init();
1868 if (error)
1869 goto out_destroy_wq;
1870
1871 error = xfs_buf_init();
1872 if (error)
1873 goto out_mru_cache_uninit;
1874
1875 error = xfs_init_procfs();
1876 if (error)
1877 goto out_buf_terminate;
1878
1879 error = xfs_sysctl_register();
1880 if (error)
1881 goto out_cleanup_procfs;
1882
1883 xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
1884 if (!xfs_kset) {
1885 error = -ENOMEM;
1886 goto out_sysctl_unregister;
1887 }
1888
1889 xfsstats.xs_kobj.kobject.kset = xfs_kset;
1890
1891 xfsstats.xs_stats = alloc_percpu(struct xfsstats);
1892 if (!xfsstats.xs_stats) {
1893 error = -ENOMEM;
1894 goto out_kset_unregister;
1895 }
1896
1897 error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
1898 "stats");
1899 if (error)
1900 goto out_free_stats;
1901
1902 #ifdef DEBUG
1903 xfs_dbg_kobj.kobject.kset = xfs_kset;
1904 error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
1905 if (error)
1906 goto out_remove_stats_kobj;
1907 #endif
1908
1909 error = xfs_qm_init();
1910 if (error)
1911 goto out_remove_dbg_kobj;
1912
1913 error = register_filesystem(&xfs_fs_type);
1914 if (error)
1915 goto out_qm_exit;
1916 return 0;
1917
1918 out_qm_exit:
1919 xfs_qm_exit();
1920 out_remove_dbg_kobj:
1921 #ifdef DEBUG
1922 xfs_sysfs_del(&xfs_dbg_kobj);
1923 out_remove_stats_kobj:
1924 #endif
1925 xfs_sysfs_del(&xfsstats.xs_kobj);
1926 out_free_stats:
1927 free_percpu(xfsstats.xs_stats);
1928 out_kset_unregister:
1929 kset_unregister(xfs_kset);
1930 out_sysctl_unregister:
1931 xfs_sysctl_unregister();
1932 out_cleanup_procfs:
1933 xfs_cleanup_procfs();
1934 out_buf_terminate:
1935 xfs_buf_terminate();
1936 out_mru_cache_uninit:
1937 xfs_mru_cache_uninit();
1938 out_destroy_wq:
1939 xfs_destroy_workqueues();
1940 out_destroy_zones:
1941 xfs_destroy_zones();
1942 out:
1943 return error;
1944 }
1945
1946 STATIC void __exit
1947 exit_xfs_fs(void)
1948 {
1949 xfs_qm_exit();
1950 unregister_filesystem(&xfs_fs_type);
1951 #ifdef DEBUG
1952 xfs_sysfs_del(&xfs_dbg_kobj);
1953 #endif
1954 xfs_sysfs_del(&xfsstats.xs_kobj);
1955 free_percpu(xfsstats.xs_stats);
1956 kset_unregister(xfs_kset);
1957 xfs_sysctl_unregister();
1958 xfs_cleanup_procfs();
1959 xfs_buf_terminate();
1960 xfs_mru_cache_uninit();
1961 xfs_destroy_workqueues();
1962 xfs_destroy_zones();
1963 xfs_uuid_table_free();
1964 }
1965
1966 module_init(init_xfs_fs);
1967 module_exit(exit_xfs_fs);
1968
1969 MODULE_AUTHOR("Silicon Graphics, Inc.");
1970 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
1971 MODULE_LICENSE("GPL");
(deprecated) Btrfs devel tree