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Linux 4.9.243
[linux/fpc-iii.git] / fs / xfs / xfs_super.c
blobb16ca13c11d5481800714b82c0fcb87021250860
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");
Linux with added FPC-III support