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fix a series of Documentation/ broken file name references
[linux-2.6/btrfs-unstable.git] / fs / xfs / xfs_super.c
blob9d791f158dfe68f5d65f8fda193cdd5496322cc1
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6
7 #include "xfs.h"
8 #include "xfs_shared.h"
9 #include "xfs_format.h"
10 #include "xfs_log_format.h"
11 #include "xfs_trans_resv.h"
12 #include "xfs_sb.h"
13 #include "xfs_mount.h"
14 #include "xfs_da_format.h"
15 #include "xfs_inode.h"
16 #include "xfs_btree.h"
17 #include "xfs_bmap.h"
18 #include "xfs_alloc.h"
19 #include "xfs_error.h"
20 #include "xfs_fsops.h"
21 #include "xfs_trans.h"
22 #include "xfs_buf_item.h"
23 #include "xfs_log.h"
24 #include "xfs_log_priv.h"
25 #include "xfs_da_btree.h"
26 #include "xfs_dir2.h"
27 #include "xfs_extfree_item.h"
28 #include "xfs_mru_cache.h"
29 #include "xfs_inode_item.h"
30 #include "xfs_icache.h"
31 #include "xfs_trace.h"
32 #include "xfs_icreate_item.h"
33 #include "xfs_filestream.h"
34 #include "xfs_quota.h"
35 #include "xfs_sysfs.h"
36 #include "xfs_ondisk.h"
37 #include "xfs_rmap_item.h"
38 #include "xfs_refcount_item.h"
39 #include "xfs_bmap_item.h"
40 #include "xfs_reflink.h"
41
42 #include <linux/namei.h>
43 #include <linux/dax.h>
44 #include <linux/init.h>
45 #include <linux/slab.h>
46 #include <linux/mount.h>
47 #include <linux/mempool.h>
48 #include <linux/writeback.h>
49 #include <linux/kthread.h>
50 #include <linux/freezer.h>
51 #include <linux/parser.h>
52
53 static const struct super_operations xfs_super_operations;
54 struct bio_set xfs_ioend_bioset;
55
56 static struct kset *xfs_kset; /* top-level xfs sysfs dir */
57 #ifdef DEBUG
58 static struct xfs_kobj xfs_dbg_kobj; /* global debug sysfs attrs */
59 #endif
60
61 /*
62 * Table driven mount option parser.
63 */
64 enum {
65 Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev, Opt_biosize,
66 Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
67 Opt_mtpt, Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
68 Opt_allocsize, Opt_norecovery, Opt_barrier, Opt_nobarrier,
69 Opt_inode64, Opt_inode32, Opt_ikeep, Opt_noikeep,
70 Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2, Opt_filestreams,
71 Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota, Opt_prjquota,
72 Opt_uquota, Opt_gquota, Opt_pquota,
73 Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
74 Opt_discard, Opt_nodiscard, Opt_dax, Opt_err,
75 };
76
77 static const match_table_t tokens = {
78 {Opt_logbufs, "logbufs=%u"}, /* number of XFS log buffers */
79 {Opt_logbsize, "logbsize=%s"}, /* size of XFS log buffers */
80 {Opt_logdev, "logdev=%s"}, /* log device */
81 {Opt_rtdev, "rtdev=%s"}, /* realtime I/O device */
82 {Opt_biosize, "biosize=%u"}, /* log2 of preferred buffered io size */
83 {Opt_wsync, "wsync"}, /* safe-mode nfs compatible mount */
84 {Opt_noalign, "noalign"}, /* turn off stripe alignment */
85 {Opt_swalloc, "swalloc"}, /* turn on stripe width allocation */
86 {Opt_sunit, "sunit=%u"}, /* data volume stripe unit */
87 {Opt_swidth, "swidth=%u"}, /* data volume stripe width */
88 {Opt_nouuid, "nouuid"}, /* ignore filesystem UUID */
89 {Opt_mtpt, "mtpt"}, /* filesystem mount point */
90 {Opt_grpid, "grpid"}, /* group-ID from parent directory */
91 {Opt_nogrpid, "nogrpid"}, /* group-ID from current process */
92 {Opt_bsdgroups, "bsdgroups"}, /* group-ID from parent directory */
93 {Opt_sysvgroups,"sysvgroups"}, /* group-ID from current process */
94 {Opt_allocsize, "allocsize=%s"},/* preferred allocation size */
95 {Opt_norecovery,"norecovery"}, /* don't run XFS recovery */
96 {Opt_inode64, "inode64"}, /* inodes can be allocated anywhere */
97 {Opt_inode32, "inode32"}, /* inode allocation limited to
98 * XFS_MAXINUMBER_32 */
99 {Opt_ikeep, "ikeep"}, /* do not free empty inode clusters */
100 {Opt_noikeep, "noikeep"}, /* free empty inode clusters */
101 {Opt_largeio, "largeio"}, /* report large I/O sizes in stat() */
102 {Opt_nolargeio, "nolargeio"}, /* do not report large I/O sizes
103 * in stat(). */
104 {Opt_attr2, "attr2"}, /* do use attr2 attribute format */
105 {Opt_noattr2, "noattr2"}, /* do not use attr2 attribute format */
106 {Opt_filestreams,"filestreams"},/* use filestreams allocator */
107 {Opt_quota, "quota"}, /* disk quotas (user) */
108 {Opt_noquota, "noquota"}, /* no quotas */
109 {Opt_usrquota, "usrquota"}, /* user quota enabled */
110 {Opt_grpquota, "grpquota"}, /* group quota enabled */
111 {Opt_prjquota, "prjquota"}, /* project quota enabled */
112 {Opt_uquota, "uquota"}, /* user quota (IRIX variant) */
113 {Opt_gquota, "gquota"}, /* group quota (IRIX variant) */
114 {Opt_pquota, "pquota"}, /* project quota (IRIX variant) */
115 {Opt_uqnoenforce,"uqnoenforce"},/* user quota limit enforcement */
116 {Opt_gqnoenforce,"gqnoenforce"},/* group quota limit enforcement */
117 {Opt_pqnoenforce,"pqnoenforce"},/* project quota limit enforcement */
118 {Opt_qnoenforce, "qnoenforce"}, /* same as uqnoenforce */
119 {Opt_discard, "discard"}, /* Discard unused blocks */
120 {Opt_nodiscard, "nodiscard"}, /* Do not discard unused blocks */
121
122 {Opt_dax, "dax"}, /* Enable direct access to bdev pages */
123
124 /* Deprecated mount options scheduled for removal */
125 {Opt_barrier, "barrier"}, /* use writer barriers for log write and
126 * unwritten extent conversion */
127 {Opt_nobarrier, "nobarrier"}, /* .. disable */
128
129 {Opt_err, NULL},
130 };
131
132
133 STATIC int
134 suffix_kstrtoint(const substring_t *s, unsigned int base, int *res)
135 {
136 int last, shift_left_factor = 0, _res;
137 char *value;
138 int ret = 0;
139
140 value = match_strdup(s);
141 if (!value)
142 return -ENOMEM;
143
144 last = strlen(value) - 1;
145 if (value[last] == 'K' || value[last] == 'k') {
146 shift_left_factor = 10;
147 value[last] = '\0';
148 }
149 if (value[last] == 'M' || value[last] == 'm') {
150 shift_left_factor = 20;
151 value[last] = '\0';
152 }
153 if (value[last] == 'G' || value[last] == 'g') {
154 shift_left_factor = 30;
155 value[last] = '\0';
156 }
157
158 if (kstrtoint(value, base, &_res))
159 ret = -EINVAL;
160 kfree(value);
161 *res = _res << shift_left_factor;
162 return ret;
163 }
164
165 /*
166 * This function fills in xfs_mount_t fields based on mount args.
167 * Note: the superblock has _not_ yet been read in.
168 *
169 * Note that this function leaks the various device name allocations on
170 * failure. The caller takes care of them.
171 *
172 * *sb is const because this is also used to test options on the remount
173 * path, and we don't want this to have any side effects at remount time.
174 * Today this function does not change *sb, but just to future-proof...
175 */
176 STATIC int
177 xfs_parseargs(
178 struct xfs_mount *mp,
179 char *options)
180 {
181 const struct super_block *sb = mp->m_super;
182 char *p;
183 substring_t args[MAX_OPT_ARGS];
184 int dsunit = 0;
185 int dswidth = 0;
186 int iosize = 0;
187 uint8_t iosizelog = 0;
188
189 /*
190 * set up the mount name first so all the errors will refer to the
191 * correct device.
192 */
193 mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
194 if (!mp->m_fsname)
195 return -ENOMEM;
196 mp->m_fsname_len = strlen(mp->m_fsname) + 1;
197
198 /*
199 * Copy binary VFS mount flags we are interested in.
200 */
201 if (sb_rdonly(sb))
202 mp->m_flags |= XFS_MOUNT_RDONLY;
203 if (sb->s_flags & SB_DIRSYNC)
204 mp->m_flags |= XFS_MOUNT_DIRSYNC;
205 if (sb->s_flags & SB_SYNCHRONOUS)
206 mp->m_flags |= XFS_MOUNT_WSYNC;
207
208 /*
209 * Set some default flags that could be cleared by the mount option
210 * parsing.
211 */
212 mp->m_flags |= XFS_MOUNT_BARRIER;
213 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
214
215 /*
216 * These can be overridden by the mount option parsing.
217 */
218 mp->m_logbufs = -1;
219 mp->m_logbsize = -1;
220
221 if (!options)
222 goto done;
223
224 while ((p = strsep(&options, ",")) != NULL) {
225 int token;
226
227 if (!*p)
228 continue;
229
230 token = match_token(p, tokens, args);
231 switch (token) {
232 case Opt_logbufs:
233 if (match_int(args, &mp->m_logbufs))
234 return -EINVAL;
235 break;
236 case Opt_logbsize:
237 if (suffix_kstrtoint(args, 10, &mp->m_logbsize))
238 return -EINVAL;
239 break;
240 case Opt_logdev:
241 kfree(mp->m_logname);
242 mp->m_logname = match_strdup(args);
243 if (!mp->m_logname)
244 return -ENOMEM;
245 break;
246 case Opt_mtpt:
247 xfs_warn(mp, "%s option not allowed on this system", p);
248 return -EINVAL;
249 case Opt_rtdev:
250 kfree(mp->m_rtname);
251 mp->m_rtname = match_strdup(args);
252 if (!mp->m_rtname)
253 return -ENOMEM;
254 break;
255 case Opt_allocsize:
256 case Opt_biosize:
257 if (suffix_kstrtoint(args, 10, &iosize))
258 return -EINVAL;
259 iosizelog = ffs(iosize) - 1;
260 break;
261 case Opt_grpid:
262 case Opt_bsdgroups:
263 mp->m_flags |= XFS_MOUNT_GRPID;
264 break;
265 case Opt_nogrpid:
266 case Opt_sysvgroups:
267 mp->m_flags &= ~XFS_MOUNT_GRPID;
268 break;
269 case Opt_wsync:
270 mp->m_flags |= XFS_MOUNT_WSYNC;
271 break;
272 case Opt_norecovery:
273 mp->m_flags |= XFS_MOUNT_NORECOVERY;
274 break;
275 case Opt_noalign:
276 mp->m_flags |= XFS_MOUNT_NOALIGN;
277 break;
278 case Opt_swalloc:
279 mp->m_flags |= XFS_MOUNT_SWALLOC;
280 break;
281 case Opt_sunit:
282 if (match_int(args, &dsunit))
283 return -EINVAL;
284 break;
285 case Opt_swidth:
286 if (match_int(args, &dswidth))
287 return -EINVAL;
288 break;
289 case Opt_inode32:
290 mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
291 break;
292 case Opt_inode64:
293 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
294 break;
295 case Opt_nouuid:
296 mp->m_flags |= XFS_MOUNT_NOUUID;
297 break;
298 case Opt_ikeep:
299 mp->m_flags |= XFS_MOUNT_IKEEP;
300 break;
301 case Opt_noikeep:
302 mp->m_flags &= ~XFS_MOUNT_IKEEP;
303 break;
304 case Opt_largeio:
305 mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
306 break;
307 case Opt_nolargeio:
308 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
309 break;
310 case Opt_attr2:
311 mp->m_flags |= XFS_MOUNT_ATTR2;
312 break;
313 case Opt_noattr2:
314 mp->m_flags &= ~XFS_MOUNT_ATTR2;
315 mp->m_flags |= XFS_MOUNT_NOATTR2;
316 break;
317 case Opt_filestreams:
318 mp->m_flags |= XFS_MOUNT_FILESTREAMS;
319 break;
320 case Opt_noquota:
321 mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
322 mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
323 mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
324 break;
325 case Opt_quota:
326 case Opt_uquota:
327 case Opt_usrquota:
328 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
329 XFS_UQUOTA_ENFD);
330 break;
331 case Opt_qnoenforce:
332 case Opt_uqnoenforce:
333 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
334 mp->m_qflags &= ~XFS_UQUOTA_ENFD;
335 break;
336 case Opt_pquota:
337 case Opt_prjquota:
338 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
339 XFS_PQUOTA_ENFD);
340 break;
341 case Opt_pqnoenforce:
342 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
343 mp->m_qflags &= ~XFS_PQUOTA_ENFD;
344 break;
345 case Opt_gquota:
346 case Opt_grpquota:
347 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
348 XFS_GQUOTA_ENFD);
349 break;
350 case Opt_gqnoenforce:
351 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
352 mp->m_qflags &= ~XFS_GQUOTA_ENFD;
353 break;
354 case Opt_discard:
355 mp->m_flags |= XFS_MOUNT_DISCARD;
356 break;
357 case Opt_nodiscard:
358 mp->m_flags &= ~XFS_MOUNT_DISCARD;
359 break;
360 #ifdef CONFIG_FS_DAX
361 case Opt_dax:
362 mp->m_flags |= XFS_MOUNT_DAX;
363 break;
364 #endif
365 case Opt_barrier:
366 xfs_warn(mp, "%s option is deprecated, ignoring.", p);
367 mp->m_flags |= XFS_MOUNT_BARRIER;
368 break;
369 case Opt_nobarrier:
370 xfs_warn(mp, "%s option is deprecated, ignoring.", p);
371 mp->m_flags &= ~XFS_MOUNT_BARRIER;
372 break;
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 struct dax_device *dax_ddev = mp->m_ddev_targp->bt_daxdev;
708
709 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
710 struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
711 struct dax_device *dax_logdev = mp->m_logdev_targp->bt_daxdev;
712
713 xfs_free_buftarg(mp->m_logdev_targp);
714 xfs_blkdev_put(logdev);
715 fs_put_dax(dax_logdev);
716 }
717 if (mp->m_rtdev_targp) {
718 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
719 struct dax_device *dax_rtdev = mp->m_rtdev_targp->bt_daxdev;
720
721 xfs_free_buftarg(mp->m_rtdev_targp);
722 xfs_blkdev_put(rtdev);
723 fs_put_dax(dax_rtdev);
724 }
725 xfs_free_buftarg(mp->m_ddev_targp);
726 fs_put_dax(dax_ddev);
727 }
728
729 /*
730 * The file system configurations are:
731 * (1) device (partition) with data and internal log
732 * (2) logical volume with data and log subvolumes.
733 * (3) logical volume with data, log, and realtime subvolumes.
734 *
735 * We only have to handle opening the log and realtime volumes here if
736 * they are present. The data subvolume has already been opened by
737 * get_sb_bdev() and is stored in sb->s_bdev.
738 */
739 STATIC int
740 xfs_open_devices(
741 struct xfs_mount *mp)
742 {
743 struct block_device *ddev = mp->m_super->s_bdev;
744 struct dax_device *dax_ddev = fs_dax_get_by_bdev(ddev);
745 struct dax_device *dax_logdev = NULL, *dax_rtdev = NULL;
746 struct block_device *logdev = NULL, *rtdev = NULL;
747 int error;
748
749 /*
750 * Open real time and log devices - order is important.
751 */
752 if (mp->m_logname) {
753 error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
754 if (error)
755 goto out;
756 dax_logdev = fs_dax_get_by_bdev(logdev);
757 }
758
759 if (mp->m_rtname) {
760 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
761 if (error)
762 goto out_close_logdev;
763
764 if (rtdev == ddev || rtdev == logdev) {
765 xfs_warn(mp,
766 "Cannot mount filesystem with identical rtdev and ddev/logdev.");
767 error = -EINVAL;
768 goto out_close_rtdev;
769 }
770 dax_rtdev = fs_dax_get_by_bdev(rtdev);
771 }
772
773 /*
774 * Setup xfs_mount buffer target pointers
775 */
776 error = -ENOMEM;
777 mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, dax_ddev);
778 if (!mp->m_ddev_targp)
779 goto out_close_rtdev;
780
781 if (rtdev) {
782 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, dax_rtdev);
783 if (!mp->m_rtdev_targp)
784 goto out_free_ddev_targ;
785 }
786
787 if (logdev && logdev != ddev) {
788 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, dax_logdev);
789 if (!mp->m_logdev_targp)
790 goto out_free_rtdev_targ;
791 } else {
792 mp->m_logdev_targp = mp->m_ddev_targp;
793 }
794
795 return 0;
796
797 out_free_rtdev_targ:
798 if (mp->m_rtdev_targp)
799 xfs_free_buftarg(mp->m_rtdev_targp);
800 out_free_ddev_targ:
801 xfs_free_buftarg(mp->m_ddev_targp);
802 out_close_rtdev:
803 xfs_blkdev_put(rtdev);
804 fs_put_dax(dax_rtdev);
805 out_close_logdev:
806 if (logdev && logdev != ddev) {
807 xfs_blkdev_put(logdev);
808 fs_put_dax(dax_logdev);
809 }
810 out:
811 fs_put_dax(dax_ddev);
812 return error;
813 }
814
815 /*
816 * Setup xfs_mount buffer target pointers based on superblock
817 */
818 STATIC int
819 xfs_setup_devices(
820 struct xfs_mount *mp)
821 {
822 int error;
823
824 error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
825 if (error)
826 return error;
827
828 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
829 unsigned int log_sector_size = BBSIZE;
830
831 if (xfs_sb_version_hassector(&mp->m_sb))
832 log_sector_size = mp->m_sb.sb_logsectsize;
833 error = xfs_setsize_buftarg(mp->m_logdev_targp,
834 log_sector_size);
835 if (error)
836 return error;
837 }
838 if (mp->m_rtdev_targp) {
839 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
840 mp->m_sb.sb_sectsize);
841 if (error)
842 return error;
843 }
844
845 return 0;
846 }
847
848 STATIC int
849 xfs_init_mount_workqueues(
850 struct xfs_mount *mp)
851 {
852 mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
853 WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_fsname);
854 if (!mp->m_buf_workqueue)
855 goto out;
856
857 mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
858 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
859 if (!mp->m_data_workqueue)
860 goto out_destroy_buf;
861
862 mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
863 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
864 if (!mp->m_unwritten_workqueue)
865 goto out_destroy_data_iodone_queue;
866
867 mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
868 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
869 if (!mp->m_cil_workqueue)
870 goto out_destroy_unwritten;
871
872 mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
873 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
874 if (!mp->m_reclaim_workqueue)
875 goto out_destroy_cil;
876
877 mp->m_log_workqueue = alloc_workqueue("xfs-log/%s",
878 WQ_MEM_RECLAIM|WQ_FREEZABLE|WQ_HIGHPRI, 0,
879 mp->m_fsname);
880 if (!mp->m_log_workqueue)
881 goto out_destroy_reclaim;
882
883 mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
884 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
885 if (!mp->m_eofblocks_workqueue)
886 goto out_destroy_log;
887
888 mp->m_sync_workqueue = alloc_workqueue("xfs-sync/%s", WQ_FREEZABLE, 0,
889 mp->m_fsname);
890 if (!mp->m_sync_workqueue)
891 goto out_destroy_eofb;
892
893 return 0;
894
895 out_destroy_eofb:
896 destroy_workqueue(mp->m_eofblocks_workqueue);
897 out_destroy_log:
898 destroy_workqueue(mp->m_log_workqueue);
899 out_destroy_reclaim:
900 destroy_workqueue(mp->m_reclaim_workqueue);
901 out_destroy_cil:
902 destroy_workqueue(mp->m_cil_workqueue);
903 out_destroy_unwritten:
904 destroy_workqueue(mp->m_unwritten_workqueue);
905 out_destroy_data_iodone_queue:
906 destroy_workqueue(mp->m_data_workqueue);
907 out_destroy_buf:
908 destroy_workqueue(mp->m_buf_workqueue);
909 out:
910 return -ENOMEM;
911 }
912
913 STATIC void
914 xfs_destroy_mount_workqueues(
915 struct xfs_mount *mp)
916 {
917 destroy_workqueue(mp->m_sync_workqueue);
918 destroy_workqueue(mp->m_eofblocks_workqueue);
919 destroy_workqueue(mp->m_log_workqueue);
920 destroy_workqueue(mp->m_reclaim_workqueue);
921 destroy_workqueue(mp->m_cil_workqueue);
922 destroy_workqueue(mp->m_data_workqueue);
923 destroy_workqueue(mp->m_unwritten_workqueue);
924 destroy_workqueue(mp->m_buf_workqueue);
925 }
926
927 /*
928 * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
929 * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
930 * for IO to complete so that we effectively throttle multiple callers to the
931 * rate at which IO is completing.
932 */
933 void
934 xfs_flush_inodes(
935 struct xfs_mount *mp)
936 {
937 struct super_block *sb = mp->m_super;
938
939 if (down_read_trylock(&sb->s_umount)) {
940 sync_inodes_sb(sb);
941 up_read(&sb->s_umount);
942 }
943 }
944
945 /* Catch misguided souls that try to use this interface on XFS */
946 STATIC struct inode *
947 xfs_fs_alloc_inode(
948 struct super_block *sb)
949 {
950 BUG();
951 return NULL;
952 }
953
954 /*
955 * Now that the generic code is guaranteed not to be accessing
956 * the linux inode, we can inactivate and reclaim the inode.
957 */
958 STATIC void
959 xfs_fs_destroy_inode(
960 struct inode *inode)
961 {
962 struct xfs_inode *ip = XFS_I(inode);
963
964 trace_xfs_destroy_inode(ip);
965
966 ASSERT(!rwsem_is_locked(&inode->i_rwsem));
967 XFS_STATS_INC(ip->i_mount, vn_rele);
968 XFS_STATS_INC(ip->i_mount, vn_remove);
969
970 xfs_inactive(ip);
971
972 ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
973 XFS_STATS_INC(ip->i_mount, vn_reclaim);
974
975 /*
976 * We should never get here with one of the reclaim flags already set.
977 */
978 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
979 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
980
981 /*
982 * We always use background reclaim here because even if the
983 * inode is clean, it still may be under IO and hence we have
984 * to take the flush lock. The background reclaim path handles
985 * this more efficiently than we can here, so simply let background
986 * reclaim tear down all inodes.
987 */
988 xfs_inode_set_reclaim_tag(ip);
989 }
990
991 static void
992 xfs_fs_dirty_inode(
993 struct inode *inode,
994 int flag)
995 {
996 struct xfs_inode *ip = XFS_I(inode);
997 struct xfs_mount *mp = ip->i_mount;
998 struct xfs_trans *tp;
999
1000 if (!(inode->i_sb->s_flags & SB_LAZYTIME))
1001 return;
1002 if (flag != I_DIRTY_SYNC || !(inode->i_state & I_DIRTY_TIME))
1003 return;
1004
1005 if (xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp))
1006 return;
1007 xfs_ilock(ip, XFS_ILOCK_EXCL);
1008 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1009 xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
1010 xfs_trans_commit(tp);
1011 }
1012
1013 /*
1014 * Slab object creation initialisation for the XFS inode.
1015 * This covers only the idempotent fields in the XFS inode;
1016 * all other fields need to be initialised on allocation
1017 * from the slab. This avoids the need to repeatedly initialise
1018 * fields in the xfs inode that left in the initialise state
1019 * when freeing the inode.
1020 */
1021 STATIC void
1022 xfs_fs_inode_init_once(
1023 void *inode)
1024 {
1025 struct xfs_inode *ip = inode;
1026
1027 memset(ip, 0, sizeof(struct xfs_inode));
1028
1029 /* vfs inode */
1030 inode_init_once(VFS_I(ip));
1031
1032 /* xfs inode */
1033 atomic_set(&ip->i_pincount, 0);
1034 spin_lock_init(&ip->i_flags_lock);
1035
1036 mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
1037 "xfsino", ip->i_ino);
1038 mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
1039 "xfsino", ip->i_ino);
1040 }
1041
1042 /*
1043 * We do an unlocked check for XFS_IDONTCACHE here because we are already
1044 * serialised against cache hits here via the inode->i_lock and igrab() in
1045 * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
1046 * racing with us, and it avoids needing to grab a spinlock here for every inode
1047 * we drop the final reference on.
1048 */
1049 STATIC int
1050 xfs_fs_drop_inode(
1051 struct inode *inode)
1052 {
1053 struct xfs_inode *ip = XFS_I(inode);
1054
1055 /*
1056 * If this unlinked inode is in the middle of recovery, don't
1057 * drop the inode just yet; log recovery will take care of
1058 * that. See the comment for this inode flag.
1059 */
1060 if (ip->i_flags & XFS_IRECOVERY) {
1061 ASSERT(ip->i_mount->m_log->l_flags & XLOG_RECOVERY_NEEDED);
1062 return 0;
1063 }
1064
1065 return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
1066 }
1067
1068 STATIC void
1069 xfs_free_fsname(
1070 struct xfs_mount *mp)
1071 {
1072 kfree(mp->m_fsname);
1073 kfree(mp->m_rtname);
1074 kfree(mp->m_logname);
1075 }
1076
1077 STATIC int
1078 xfs_fs_sync_fs(
1079 struct super_block *sb,
1080 int wait)
1081 {
1082 struct xfs_mount *mp = XFS_M(sb);
1083
1084 /*
1085 * Doing anything during the async pass would be counterproductive.
1086 */
1087 if (!wait)
1088 return 0;
1089
1090 xfs_log_force(mp, XFS_LOG_SYNC);
1091 if (laptop_mode) {
1092 /*
1093 * The disk must be active because we're syncing.
1094 * We schedule log work now (now that the disk is
1095 * active) instead of later (when it might not be).
1096 */
1097 flush_delayed_work(&mp->m_log->l_work);
1098 }
1099
1100 return 0;
1101 }
1102
1103 STATIC int
1104 xfs_fs_statfs(
1105 struct dentry *dentry,
1106 struct kstatfs *statp)
1107 {
1108 struct xfs_mount *mp = XFS_M(dentry->d_sb);
1109 xfs_sb_t *sbp = &mp->m_sb;
1110 struct xfs_inode *ip = XFS_I(d_inode(dentry));
1111 uint64_t fakeinos, id;
1112 uint64_t icount;
1113 uint64_t ifree;
1114 uint64_t fdblocks;
1115 xfs_extlen_t lsize;
1116 int64_t ffree;
1117
1118 statp->f_type = XFS_SB_MAGIC;
1119 statp->f_namelen = MAXNAMELEN - 1;
1120
1121 id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
1122 statp->f_fsid.val[0] = (u32)id;
1123 statp->f_fsid.val[1] = (u32)(id >> 32);
1124
1125 icount = percpu_counter_sum(&mp->m_icount);
1126 ifree = percpu_counter_sum(&mp->m_ifree);
1127 fdblocks = percpu_counter_sum(&mp->m_fdblocks);
1128
1129 spin_lock(&mp->m_sb_lock);
1130 statp->f_bsize = sbp->sb_blocksize;
1131 lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
1132 statp->f_blocks = sbp->sb_dblocks - lsize;
1133 spin_unlock(&mp->m_sb_lock);
1134
1135 statp->f_bfree = fdblocks - mp->m_alloc_set_aside;
1136 statp->f_bavail = statp->f_bfree;
1137
1138 fakeinos = statp->f_bfree << sbp->sb_inopblog;
1139 statp->f_files = min(icount + fakeinos, (uint64_t)XFS_MAXINUMBER);
1140 if (mp->m_maxicount)
1141 statp->f_files = min_t(typeof(statp->f_files),
1142 statp->f_files,
1143 mp->m_maxicount);
1144
1145 /* If sb_icount overshot maxicount, report actual allocation */
1146 statp->f_files = max_t(typeof(statp->f_files),
1147 statp->f_files,
1148 sbp->sb_icount);
1149
1150 /* make sure statp->f_ffree does not underflow */
1151 ffree = statp->f_files - (icount - ifree);
1152 statp->f_ffree = max_t(int64_t, ffree, 0);
1153
1154
1155 if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1156 ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
1157 (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
1158 xfs_qm_statvfs(ip, statp);
1159
1160 if (XFS_IS_REALTIME_MOUNT(mp) &&
1161 (ip->i_d.di_flags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME))) {
1162 statp->f_blocks = sbp->sb_rblocks;
1163 statp->f_bavail = statp->f_bfree =
1164 sbp->sb_frextents * sbp->sb_rextsize;
1165 }
1166
1167 return 0;
1168 }
1169
1170 STATIC void
1171 xfs_save_resvblks(struct xfs_mount *mp)
1172 {
1173 uint64_t resblks = 0;
1174
1175 mp->m_resblks_save = mp->m_resblks;
1176 xfs_reserve_blocks(mp, &resblks, NULL);
1177 }
1178
1179 STATIC void
1180 xfs_restore_resvblks(struct xfs_mount *mp)
1181 {
1182 uint64_t resblks;
1183
1184 if (mp->m_resblks_save) {
1185 resblks = mp->m_resblks_save;
1186 mp->m_resblks_save = 0;
1187 } else
1188 resblks = xfs_default_resblks(mp);
1189
1190 xfs_reserve_blocks(mp, &resblks, NULL);
1191 }
1192
1193 /*
1194 * Trigger writeback of all the dirty metadata in the file system.
1195 *
1196 * This ensures that the metadata is written to their location on disk rather
1197 * than just existing in transactions in the log. This means after a quiesce
1198 * there is no log replay required to write the inodes to disk - this is the
1199 * primary difference between a sync and a quiesce.
1200 *
1201 * Note: xfs_log_quiesce() stops background log work - the callers must ensure
1202 * it is started again when appropriate.
1203 */
1204 void
1205 xfs_quiesce_attr(
1206 struct xfs_mount *mp)
1207 {
1208 int error = 0;
1209
1210 /* wait for all modifications to complete */
1211 while (atomic_read(&mp->m_active_trans) > 0)
1212 delay(100);
1213
1214 /* force the log to unpin objects from the now complete transactions */
1215 xfs_log_force(mp, XFS_LOG_SYNC);
1216
1217 /* reclaim inodes to do any IO before the freeze completes */
1218 xfs_reclaim_inodes(mp, 0);
1219 xfs_reclaim_inodes(mp, SYNC_WAIT);
1220
1221 /* Push the superblock and write an unmount record */
1222 error = xfs_log_sbcount(mp);
1223 if (error)
1224 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
1225 "Frozen image may not be consistent.");
1226 /*
1227 * Just warn here till VFS can correctly support
1228 * read-only remount without racing.
1229 */
1230 WARN_ON(atomic_read(&mp->m_active_trans) != 0);
1231
1232 xfs_log_quiesce(mp);
1233 }
1234
1235 STATIC int
1236 xfs_test_remount_options(
1237 struct super_block *sb,
1238 char *options)
1239 {
1240 int error = 0;
1241 struct xfs_mount *tmp_mp;
1242
1243 tmp_mp = kmem_zalloc(sizeof(*tmp_mp), KM_MAYFAIL);
1244 if (!tmp_mp)
1245 return -ENOMEM;
1246
1247 tmp_mp->m_super = sb;
1248 error = xfs_parseargs(tmp_mp, options);
1249 xfs_free_fsname(tmp_mp);
1250 kmem_free(tmp_mp);
1251
1252 return error;
1253 }
1254
1255 STATIC int
1256 xfs_fs_remount(
1257 struct super_block *sb,
1258 int *flags,
1259 char *options)
1260 {
1261 struct xfs_mount *mp = XFS_M(sb);
1262 xfs_sb_t *sbp = &mp->m_sb;
1263 substring_t args[MAX_OPT_ARGS];
1264 char *p;
1265 int error;
1266
1267 /* First, check for complete junk; i.e. invalid options */
1268 error = xfs_test_remount_options(sb, options);
1269 if (error)
1270 return error;
1271
1272 sync_filesystem(sb);
1273 while ((p = strsep(&options, ",")) != NULL) {
1274 int token;
1275
1276 if (!*p)
1277 continue;
1278
1279 token = match_token(p, tokens, args);
1280 switch (token) {
1281 case Opt_barrier:
1282 xfs_warn(mp, "%s option is deprecated, ignoring.", p);
1283 mp->m_flags |= XFS_MOUNT_BARRIER;
1284 break;
1285 case Opt_nobarrier:
1286 xfs_warn(mp, "%s option is deprecated, ignoring.", p);
1287 mp->m_flags &= ~XFS_MOUNT_BARRIER;
1288 break;
1289 case Opt_inode64:
1290 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
1291 mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1292 break;
1293 case Opt_inode32:
1294 mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
1295 mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
1296 break;
1297 default:
1298 /*
1299 * Logically we would return an error here to prevent
1300 * users from believing they might have changed
1301 * mount options using remount which can't be changed.
1302 *
1303 * But unfortunately mount(8) adds all options from
1304 * mtab and fstab to the mount arguments in some cases
1305 * so we can't blindly reject options, but have to
1306 * check for each specified option if it actually
1307 * differs from the currently set option and only
1308 * reject it if that's the case.
1309 *
1310 * Until that is implemented we return success for
1311 * every remount request, and silently ignore all
1312 * options that we can't actually change.
1313 */
1314 #if 0
1315 xfs_info(mp,
1316 "mount option \"%s\" not supported for remount", p);
1317 return -EINVAL;
1318 #else
1319 break;
1320 #endif
1321 }
1322 }
1323
1324 /* ro -> rw */
1325 if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & SB_RDONLY)) {
1326 if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
1327 xfs_warn(mp,
1328 "ro->rw transition prohibited on norecovery mount");
1329 return -EINVAL;
1330 }
1331
1332 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
1333 xfs_sb_has_ro_compat_feature(sbp,
1334 XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
1335 xfs_warn(mp,
1336 "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
1337 (sbp->sb_features_ro_compat &
1338 XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
1339 return -EINVAL;
1340 }
1341
1342 mp->m_flags &= ~XFS_MOUNT_RDONLY;
1343
1344 /*
1345 * If this is the first remount to writeable state we
1346 * might have some superblock changes to update.
1347 */
1348 if (mp->m_update_sb) {
1349 error = xfs_sync_sb(mp, false);
1350 if (error) {
1351 xfs_warn(mp, "failed to write sb changes");
1352 return error;
1353 }
1354 mp->m_update_sb = false;
1355 }
1356
1357 /*
1358 * Fill out the reserve pool if it is empty. Use the stashed
1359 * value if it is non-zero, otherwise go with the default.
1360 */
1361 xfs_restore_resvblks(mp);
1362 xfs_log_work_queue(mp);
1363
1364 /* Recover any CoW blocks that never got remapped. */
1365 error = xfs_reflink_recover_cow(mp);
1366 if (error) {
1367 xfs_err(mp,
1368 "Error %d recovering leftover CoW allocations.", error);
1369 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1370 return error;
1371 }
1372 xfs_icache_enable_reclaim(mp);
1373
1374 /* Create the per-AG metadata reservation pool .*/
1375 error = xfs_fs_reserve_ag_blocks(mp);
1376 if (error && error != -ENOSPC)
1377 return error;
1378 }
1379
1380 /* rw -> ro */
1381 if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & SB_RDONLY)) {
1382 /*
1383 * Cancel background eofb scanning so it cannot race with the
1384 * final log force+buftarg wait and deadlock the remount.
1385 */
1386 xfs_icache_disable_reclaim(mp);
1387
1388 /* Get rid of any leftover CoW reservations... */
1389 error = xfs_icache_free_cowblocks(mp, NULL);
1390 if (error) {
1391 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1392 return error;
1393 }
1394
1395 /* Free the per-AG metadata reservation pool. */
1396 error = xfs_fs_unreserve_ag_blocks(mp);
1397 if (error) {
1398 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1399 return error;
1400 }
1401
1402 /*
1403 * Before we sync the metadata, we need to free up the reserve
1404 * block pool so that the used block count in the superblock on
1405 * disk is correct at the end of the remount. Stash the current
1406 * reserve pool size so that if we get remounted rw, we can
1407 * return it to the same size.
1408 */
1409 xfs_save_resvblks(mp);
1410
1411 xfs_quiesce_attr(mp);
1412 mp->m_flags |= XFS_MOUNT_RDONLY;
1413 }
1414
1415 return 0;
1416 }
1417
1418 /*
1419 * Second stage of a freeze. The data is already frozen so we only
1420 * need to take care of the metadata. Once that's done sync the superblock
1421 * to the log to dirty it in case of a crash while frozen. This ensures that we
1422 * will recover the unlinked inode lists on the next mount.
1423 */
1424 STATIC int
1425 xfs_fs_freeze(
1426 struct super_block *sb)
1427 {
1428 struct xfs_mount *mp = XFS_M(sb);
1429
1430 xfs_icache_disable_reclaim(mp);
1431 xfs_save_resvblks(mp);
1432 xfs_quiesce_attr(mp);
1433 return xfs_sync_sb(mp, true);
1434 }
1435
1436 STATIC int
1437 xfs_fs_unfreeze(
1438 struct super_block *sb)
1439 {
1440 struct xfs_mount *mp = XFS_M(sb);
1441
1442 xfs_restore_resvblks(mp);
1443 xfs_log_work_queue(mp);
1444 xfs_icache_enable_reclaim(mp);
1445 return 0;
1446 }
1447
1448 STATIC int
1449 xfs_fs_show_options(
1450 struct seq_file *m,
1451 struct dentry *root)
1452 {
1453 return xfs_showargs(XFS_M(root->d_sb), m);
1454 }
1455
1456 /*
1457 * This function fills in xfs_mount_t fields based on mount args.
1458 * Note: the superblock _has_ now been read in.
1459 */
1460 STATIC int
1461 xfs_finish_flags(
1462 struct xfs_mount *mp)
1463 {
1464 int ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
1465
1466 /* Fail a mount where the logbuf is smaller than the log stripe */
1467 if (xfs_sb_version_haslogv2(&mp->m_sb)) {
1468 if (mp->m_logbsize <= 0 &&
1469 mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
1470 mp->m_logbsize = mp->m_sb.sb_logsunit;
1471 } else if (mp->m_logbsize > 0 &&
1472 mp->m_logbsize < mp->m_sb.sb_logsunit) {
1473 xfs_warn(mp,
1474 "logbuf size must be greater than or equal to log stripe size");
1475 return -EINVAL;
1476 }
1477 } else {
1478 /* Fail a mount if the logbuf is larger than 32K */
1479 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
1480 xfs_warn(mp,
1481 "logbuf size for version 1 logs must be 16K or 32K");
1482 return -EINVAL;
1483 }
1484 }
1485
1486 /*
1487 * V5 filesystems always use attr2 format for attributes.
1488 */
1489 if (xfs_sb_version_hascrc(&mp->m_sb) &&
1490 (mp->m_flags & XFS_MOUNT_NOATTR2)) {
1491 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
1492 "attr2 is always enabled for V5 filesystems.");
1493 return -EINVAL;
1494 }
1495
1496 /*
1497 * mkfs'ed attr2 will turn on attr2 mount unless explicitly
1498 * told by noattr2 to turn it off
1499 */
1500 if (xfs_sb_version_hasattr2(&mp->m_sb) &&
1501 !(mp->m_flags & XFS_MOUNT_NOATTR2))
1502 mp->m_flags |= XFS_MOUNT_ATTR2;
1503
1504 /*
1505 * prohibit r/w mounts of read-only filesystems
1506 */
1507 if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
1508 xfs_warn(mp,
1509 "cannot mount a read-only filesystem as read-write");
1510 return -EROFS;
1511 }
1512
1513 if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
1514 (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
1515 !xfs_sb_version_has_pquotino(&mp->m_sb)) {
1516 xfs_warn(mp,
1517 "Super block does not support project and group quota together");
1518 return -EINVAL;
1519 }
1520
1521 return 0;
1522 }
1523
1524 static int
1525 xfs_init_percpu_counters(
1526 struct xfs_mount *mp)
1527 {
1528 int error;
1529
1530 error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
1531 if (error)
1532 return -ENOMEM;
1533
1534 error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
1535 if (error)
1536 goto free_icount;
1537
1538 error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
1539 if (error)
1540 goto free_ifree;
1541
1542 return 0;
1543
1544 free_ifree:
1545 percpu_counter_destroy(&mp->m_ifree);
1546 free_icount:
1547 percpu_counter_destroy(&mp->m_icount);
1548 return -ENOMEM;
1549 }
1550
1551 void
1552 xfs_reinit_percpu_counters(
1553 struct xfs_mount *mp)
1554 {
1555 percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
1556 percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
1557 percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
1558 }
1559
1560 static void
1561 xfs_destroy_percpu_counters(
1562 struct xfs_mount *mp)
1563 {
1564 percpu_counter_destroy(&mp->m_icount);
1565 percpu_counter_destroy(&mp->m_ifree);
1566 percpu_counter_destroy(&mp->m_fdblocks);
1567 }
1568
1569 static struct xfs_mount *
1570 xfs_mount_alloc(
1571 struct super_block *sb)
1572 {
1573 struct xfs_mount *mp;
1574
1575 mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
1576 if (!mp)
1577 return NULL;
1578
1579 mp->m_super = sb;
1580 spin_lock_init(&mp->m_sb_lock);
1581 spin_lock_init(&mp->m_agirotor_lock);
1582 INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC);
1583 spin_lock_init(&mp->m_perag_lock);
1584 mutex_init(&mp->m_growlock);
1585 atomic_set(&mp->m_active_trans, 0);
1586 INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
1587 INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
1588 INIT_DELAYED_WORK(&mp->m_cowblocks_work, xfs_cowblocks_worker);
1589 mp->m_kobj.kobject.kset = xfs_kset;
1590 return mp;
1591 }
1592
1593
1594 STATIC int
1595 xfs_fs_fill_super(
1596 struct super_block *sb,
1597 void *data,
1598 int silent)
1599 {
1600 struct inode *root;
1601 struct xfs_mount *mp = NULL;
1602 int flags = 0, error = -ENOMEM;
1603
1604 /*
1605 * allocate mp and do all low-level struct initializations before we
1606 * attach it to the super
1607 */
1608 mp = xfs_mount_alloc(sb);
1609 if (!mp)
1610 goto out;
1611 sb->s_fs_info = mp;
1612
1613 error = xfs_parseargs(mp, (char *)data);
1614 if (error)
1615 goto out_free_fsname;
1616
1617 sb_min_blocksize(sb, BBSIZE);
1618 sb->s_xattr = xfs_xattr_handlers;
1619 sb->s_export_op = &xfs_export_operations;
1620 #ifdef CONFIG_XFS_QUOTA
1621 sb->s_qcop = &xfs_quotactl_operations;
1622 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
1623 #endif
1624 sb->s_op = &xfs_super_operations;
1625
1626 /*
1627 * Delay mount work if the debug hook is set. This is debug
1628 * instrumention to coordinate simulation of xfs mount failures with
1629 * VFS superblock operations
1630 */
1631 if (xfs_globals.mount_delay) {
1632 xfs_notice(mp, "Delaying mount for %d seconds.",
1633 xfs_globals.mount_delay);
1634 msleep(xfs_globals.mount_delay * 1000);
1635 }
1636
1637 if (silent)
1638 flags |= XFS_MFSI_QUIET;
1639
1640 error = xfs_open_devices(mp);
1641 if (error)
1642 goto out_free_fsname;
1643
1644 error = xfs_init_mount_workqueues(mp);
1645 if (error)
1646 goto out_close_devices;
1647
1648 error = xfs_init_percpu_counters(mp);
1649 if (error)
1650 goto out_destroy_workqueues;
1651
1652 /* Allocate stats memory before we do operations that might use it */
1653 mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
1654 if (!mp->m_stats.xs_stats) {
1655 error = -ENOMEM;
1656 goto out_destroy_counters;
1657 }
1658
1659 error = xfs_readsb(mp, flags);
1660 if (error)
1661 goto out_free_stats;
1662
1663 error = xfs_finish_flags(mp);
1664 if (error)
1665 goto out_free_sb;
1666
1667 error = xfs_setup_devices(mp);
1668 if (error)
1669 goto out_free_sb;
1670
1671 error = xfs_filestream_mount(mp);
1672 if (error)
1673 goto out_free_sb;
1674
1675 /*
1676 * we must configure the block size in the superblock before we run the
1677 * full mount process as the mount process can lookup and cache inodes.
1678 */
1679 sb->s_magic = XFS_SB_MAGIC;
1680 sb->s_blocksize = mp->m_sb.sb_blocksize;
1681 sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
1682 sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
1683 sb->s_max_links = XFS_MAXLINK;
1684 sb->s_time_gran = 1;
1685 set_posix_acl_flag(sb);
1686
1687 /* version 5 superblocks support inode version counters. */
1688 if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
1689 sb->s_flags |= SB_I_VERSION;
1690
1691 if (mp->m_flags & XFS_MOUNT_DAX) {
1692 bool rtdev_is_dax = false, datadev_is_dax;
1693
1694 xfs_warn(mp,
1695 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1696
1697 datadev_is_dax = bdev_dax_supported(mp->m_ddev_targp->bt_bdev,
1698 sb->s_blocksize);
1699 if (mp->m_rtdev_targp)
1700 rtdev_is_dax = bdev_dax_supported(
1701 mp->m_rtdev_targp->bt_bdev, sb->s_blocksize);
1702 if (!rtdev_is_dax && !datadev_is_dax) {
1703 xfs_alert(mp,
1704 "DAX unsupported by block device. Turning off DAX.");
1705 mp->m_flags &= ~XFS_MOUNT_DAX;
1706 }
1707 if (xfs_sb_version_hasreflink(&mp->m_sb)) {
1708 xfs_alert(mp,
1709 "DAX and reflink cannot be used together!");
1710 error = -EINVAL;
1711 goto out_filestream_unmount;
1712 }
1713 }
1714
1715 if (mp->m_flags & XFS_MOUNT_DISCARD) {
1716 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1717
1718 if (!blk_queue_discard(q)) {
1719 xfs_warn(mp, "mounting with \"discard\" option, but "
1720 "the device does not support discard");
1721 mp->m_flags &= ~XFS_MOUNT_DISCARD;
1722 }
1723 }
1724
1725 if (xfs_sb_version_hasreflink(&mp->m_sb) && mp->m_sb.sb_rblocks) {
1726 xfs_alert(mp,
1727 "reflink not compatible with realtime device!");
1728 error = -EINVAL;
1729 goto out_filestream_unmount;
1730 }
1731
1732 if (xfs_sb_version_hasrmapbt(&mp->m_sb) && mp->m_sb.sb_rblocks) {
1733 xfs_alert(mp,
1734 "reverse mapping btree not compatible with realtime device!");
1735 error = -EINVAL;
1736 goto out_filestream_unmount;
1737 }
1738
1739 error = xfs_mountfs(mp);
1740 if (error)
1741 goto out_filestream_unmount;
1742
1743 root = igrab(VFS_I(mp->m_rootip));
1744 if (!root) {
1745 error = -ENOENT;
1746 goto out_unmount;
1747 }
1748 sb->s_root = d_make_root(root);
1749 if (!sb->s_root) {
1750 error = -ENOMEM;
1751 goto out_unmount;
1752 }
1753
1754 return 0;
1755
1756 out_filestream_unmount:
1757 xfs_filestream_unmount(mp);
1758 out_free_sb:
1759 xfs_freesb(mp);
1760 out_free_stats:
1761 free_percpu(mp->m_stats.xs_stats);
1762 out_destroy_counters:
1763 xfs_destroy_percpu_counters(mp);
1764 out_destroy_workqueues:
1765 xfs_destroy_mount_workqueues(mp);
1766 out_close_devices:
1767 xfs_close_devices(mp);
1768 out_free_fsname:
1769 sb->s_fs_info = NULL;
1770 xfs_free_fsname(mp);
1771 kfree(mp);
1772 out:
1773 return error;
1774
1775 out_unmount:
1776 xfs_filestream_unmount(mp);
1777 xfs_unmountfs(mp);
1778 goto out_free_sb;
1779 }
1780
1781 STATIC void
1782 xfs_fs_put_super(
1783 struct super_block *sb)
1784 {
1785 struct xfs_mount *mp = XFS_M(sb);
1786
1787 /* if ->fill_super failed, we have no mount to tear down */
1788 if (!sb->s_fs_info)
1789 return;
1790
1791 xfs_notice(mp, "Unmounting Filesystem");
1792 xfs_filestream_unmount(mp);
1793 xfs_unmountfs(mp);
1794
1795 xfs_freesb(mp);
1796 free_percpu(mp->m_stats.xs_stats);
1797 xfs_destroy_percpu_counters(mp);
1798 xfs_destroy_mount_workqueues(mp);
1799 xfs_close_devices(mp);
1800
1801 sb->s_fs_info = NULL;
1802 xfs_free_fsname(mp);
1803 kfree(mp);
1804 }
1805
1806 STATIC struct dentry *
1807 xfs_fs_mount(
1808 struct file_system_type *fs_type,
1809 int flags,
1810 const char *dev_name,
1811 void *data)
1812 {
1813 return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
1814 }
1815
1816 static long
1817 xfs_fs_nr_cached_objects(
1818 struct super_block *sb,
1819 struct shrink_control *sc)
1820 {
1821 /* Paranoia: catch incorrect calls during mount setup or teardown */
1822 if (WARN_ON_ONCE(!sb->s_fs_info))
1823 return 0;
1824 return xfs_reclaim_inodes_count(XFS_M(sb));
1825 }
1826
1827 static long
1828 xfs_fs_free_cached_objects(
1829 struct super_block *sb,
1830 struct shrink_control *sc)
1831 {
1832 return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
1833 }
1834
1835 static const struct super_operations xfs_super_operations = {
1836 .alloc_inode = xfs_fs_alloc_inode,
1837 .destroy_inode = xfs_fs_destroy_inode,
1838 .dirty_inode = xfs_fs_dirty_inode,
1839 .drop_inode = xfs_fs_drop_inode,
1840 .put_super = xfs_fs_put_super,
1841 .sync_fs = xfs_fs_sync_fs,
1842 .freeze_fs = xfs_fs_freeze,
1843 .unfreeze_fs = xfs_fs_unfreeze,
1844 .statfs = xfs_fs_statfs,
1845 .remount_fs = xfs_fs_remount,
1846 .show_options = xfs_fs_show_options,
1847 .nr_cached_objects = xfs_fs_nr_cached_objects,
1848 .free_cached_objects = xfs_fs_free_cached_objects,
1849 };
1850
1851 static struct file_system_type xfs_fs_type = {
1852 .owner = THIS_MODULE,
1853 .name = "xfs",
1854 .mount = xfs_fs_mount,
1855 .kill_sb = kill_block_super,
1856 .fs_flags = FS_REQUIRES_DEV,
1857 };
1858 MODULE_ALIAS_FS("xfs");
1859
1860 STATIC int __init
1861 xfs_init_zones(void)
1862 {
1863 if (bioset_init(&xfs_ioend_bioset, 4 * MAX_BUF_PER_PAGE,
1864 offsetof(struct xfs_ioend, io_inline_bio),
1865 BIOSET_NEED_BVECS))
1866 goto out;
1867
1868 xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
1869 "xfs_log_ticket");
1870 if (!xfs_log_ticket_zone)
1871 goto out_free_ioend_bioset;
1872
1873 xfs_bmap_free_item_zone = kmem_zone_init(
1874 sizeof(struct xfs_extent_free_item),
1875 "xfs_bmap_free_item");
1876 if (!xfs_bmap_free_item_zone)
1877 goto out_destroy_log_ticket_zone;
1878
1879 xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
1880 "xfs_btree_cur");
1881 if (!xfs_btree_cur_zone)
1882 goto out_destroy_bmap_free_item_zone;
1883
1884 xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
1885 "xfs_da_state");
1886 if (!xfs_da_state_zone)
1887 goto out_destroy_btree_cur_zone;
1888
1889 xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
1890 if (!xfs_ifork_zone)
1891 goto out_destroy_da_state_zone;
1892
1893 xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
1894 if (!xfs_trans_zone)
1895 goto out_destroy_ifork_zone;
1896
1897
1898 /*
1899 * The size of the zone allocated buf log item is the maximum
1900 * size possible under XFS. This wastes a little bit of memory,
1901 * but it is much faster.
1902 */
1903 xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
1904 "xfs_buf_item");
1905 if (!xfs_buf_item_zone)
1906 goto out_destroy_trans_zone;
1907
1908 xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
1909 ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
1910 sizeof(xfs_extent_t))), "xfs_efd_item");
1911 if (!xfs_efd_zone)
1912 goto out_destroy_buf_item_zone;
1913
1914 xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
1915 ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
1916 sizeof(xfs_extent_t))), "xfs_efi_item");
1917 if (!xfs_efi_zone)
1918 goto out_destroy_efd_zone;
1919
1920 xfs_inode_zone =
1921 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
1922 KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD |
1923 KM_ZONE_ACCOUNT, xfs_fs_inode_init_once);
1924 if (!xfs_inode_zone)
1925 goto out_destroy_efi_zone;
1926
1927 xfs_ili_zone =
1928 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
1929 KM_ZONE_SPREAD, NULL);
1930 if (!xfs_ili_zone)
1931 goto out_destroy_inode_zone;
1932 xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
1933 "xfs_icr");
1934 if (!xfs_icreate_zone)
1935 goto out_destroy_ili_zone;
1936
1937 xfs_rud_zone = kmem_zone_init(sizeof(struct xfs_rud_log_item),
1938 "xfs_rud_item");
1939 if (!xfs_rud_zone)
1940 goto out_destroy_icreate_zone;
1941
1942 xfs_rui_zone = kmem_zone_init(
1943 xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
1944 "xfs_rui_item");
1945 if (!xfs_rui_zone)
1946 goto out_destroy_rud_zone;
1947
1948 xfs_cud_zone = kmem_zone_init(sizeof(struct xfs_cud_log_item),
1949 "xfs_cud_item");
1950 if (!xfs_cud_zone)
1951 goto out_destroy_rui_zone;
1952
1953 xfs_cui_zone = kmem_zone_init(
1954 xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
1955 "xfs_cui_item");
1956 if (!xfs_cui_zone)
1957 goto out_destroy_cud_zone;
1958
1959 xfs_bud_zone = kmem_zone_init(sizeof(struct xfs_bud_log_item),
1960 "xfs_bud_item");
1961 if (!xfs_bud_zone)
1962 goto out_destroy_cui_zone;
1963
1964 xfs_bui_zone = kmem_zone_init(
1965 xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
1966 "xfs_bui_item");
1967 if (!xfs_bui_zone)
1968 goto out_destroy_bud_zone;
1969
1970 return 0;
1971
1972 out_destroy_bud_zone:
1973 kmem_zone_destroy(xfs_bud_zone);
1974 out_destroy_cui_zone:
1975 kmem_zone_destroy(xfs_cui_zone);
1976 out_destroy_cud_zone:
1977 kmem_zone_destroy(xfs_cud_zone);
1978 out_destroy_rui_zone:
1979 kmem_zone_destroy(xfs_rui_zone);
1980 out_destroy_rud_zone:
1981 kmem_zone_destroy(xfs_rud_zone);
1982 out_destroy_icreate_zone:
1983 kmem_zone_destroy(xfs_icreate_zone);
1984 out_destroy_ili_zone:
1985 kmem_zone_destroy(xfs_ili_zone);
1986 out_destroy_inode_zone:
1987 kmem_zone_destroy(xfs_inode_zone);
1988 out_destroy_efi_zone:
1989 kmem_zone_destroy(xfs_efi_zone);
1990 out_destroy_efd_zone:
1991 kmem_zone_destroy(xfs_efd_zone);
1992 out_destroy_buf_item_zone:
1993 kmem_zone_destroy(xfs_buf_item_zone);
1994 out_destroy_trans_zone:
1995 kmem_zone_destroy(xfs_trans_zone);
1996 out_destroy_ifork_zone:
1997 kmem_zone_destroy(xfs_ifork_zone);
1998 out_destroy_da_state_zone:
1999 kmem_zone_destroy(xfs_da_state_zone);
2000 out_destroy_btree_cur_zone:
2001 kmem_zone_destroy(xfs_btree_cur_zone);
2002 out_destroy_bmap_free_item_zone:
2003 kmem_zone_destroy(xfs_bmap_free_item_zone);
2004 out_destroy_log_ticket_zone:
2005 kmem_zone_destroy(xfs_log_ticket_zone);
2006 out_free_ioend_bioset:
2007 bioset_exit(&xfs_ioend_bioset);
2008 out:
2009 return -ENOMEM;
2010 }
2011
2012 STATIC void
2013 xfs_destroy_zones(void)
2014 {
2015 /*
2016 * Make sure all delayed rcu free are flushed before we
2017 * destroy caches.
2018 */
2019 rcu_barrier();
2020 kmem_zone_destroy(xfs_bui_zone);
2021 kmem_zone_destroy(xfs_bud_zone);
2022 kmem_zone_destroy(xfs_cui_zone);
2023 kmem_zone_destroy(xfs_cud_zone);
2024 kmem_zone_destroy(xfs_rui_zone);
2025 kmem_zone_destroy(xfs_rud_zone);
2026 kmem_zone_destroy(xfs_icreate_zone);
2027 kmem_zone_destroy(xfs_ili_zone);
2028 kmem_zone_destroy(xfs_inode_zone);
2029 kmem_zone_destroy(xfs_efi_zone);
2030 kmem_zone_destroy(xfs_efd_zone);
2031 kmem_zone_destroy(xfs_buf_item_zone);
2032 kmem_zone_destroy(xfs_trans_zone);
2033 kmem_zone_destroy(xfs_ifork_zone);
2034 kmem_zone_destroy(xfs_da_state_zone);
2035 kmem_zone_destroy(xfs_btree_cur_zone);
2036 kmem_zone_destroy(xfs_bmap_free_item_zone);
2037 kmem_zone_destroy(xfs_log_ticket_zone);
2038 bioset_exit(&xfs_ioend_bioset);
2039 }
2040
2041 STATIC int __init
2042 xfs_init_workqueues(void)
2043 {
2044 /*
2045 * The allocation workqueue can be used in memory reclaim situations
2046 * (writepage path), and parallelism is only limited by the number of
2047 * AGs in all the filesystems mounted. Hence use the default large
2048 * max_active value for this workqueue.
2049 */
2050 xfs_alloc_wq = alloc_workqueue("xfsalloc",
2051 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
2052 if (!xfs_alloc_wq)
2053 return -ENOMEM;
2054
2055 xfs_discard_wq = alloc_workqueue("xfsdiscard", WQ_UNBOUND, 0);
2056 if (!xfs_discard_wq)
2057 goto out_free_alloc_wq;
2058
2059 return 0;
2060 out_free_alloc_wq:
2061 destroy_workqueue(xfs_alloc_wq);
2062 return -ENOMEM;
2063 }
2064
2065 STATIC void
2066 xfs_destroy_workqueues(void)
2067 {
2068 destroy_workqueue(xfs_discard_wq);
2069 destroy_workqueue(xfs_alloc_wq);
2070 }
2071
2072 STATIC int __init
2073 init_xfs_fs(void)
2074 {
2075 int error;
2076
2077 xfs_check_ondisk_structs();
2078
2079 printk(KERN_INFO XFS_VERSION_STRING " with "
2080 XFS_BUILD_OPTIONS " enabled\n");
2081
2082 xfs_extent_free_init_defer_op();
2083 xfs_rmap_update_init_defer_op();
2084 xfs_refcount_update_init_defer_op();
2085 xfs_bmap_update_init_defer_op();
2086
2087 xfs_dir_startup();
2088
2089 error = xfs_init_zones();
2090 if (error)
2091 goto out;
2092
2093 error = xfs_init_workqueues();
2094 if (error)
2095 goto out_destroy_zones;
2096
2097 error = xfs_mru_cache_init();
2098 if (error)
2099 goto out_destroy_wq;
2100
2101 error = xfs_buf_init();
2102 if (error)
2103 goto out_mru_cache_uninit;
2104
2105 error = xfs_init_procfs();
2106 if (error)
2107 goto out_buf_terminate;
2108
2109 error = xfs_sysctl_register();
2110 if (error)
2111 goto out_cleanup_procfs;
2112
2113 xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
2114 if (!xfs_kset) {
2115 error = -ENOMEM;
2116 goto out_sysctl_unregister;
2117 }
2118
2119 xfsstats.xs_kobj.kobject.kset = xfs_kset;
2120
2121 xfsstats.xs_stats = alloc_percpu(struct xfsstats);
2122 if (!xfsstats.xs_stats) {
2123 error = -ENOMEM;
2124 goto out_kset_unregister;
2125 }
2126
2127 error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
2128 "stats");
2129 if (error)
2130 goto out_free_stats;
2131
2132 #ifdef DEBUG
2133 xfs_dbg_kobj.kobject.kset = xfs_kset;
2134 error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
2135 if (error)
2136 goto out_remove_stats_kobj;
2137 #endif
2138
2139 error = xfs_qm_init();
2140 if (error)
2141 goto out_remove_dbg_kobj;
2142
2143 error = register_filesystem(&xfs_fs_type);
2144 if (error)
2145 goto out_qm_exit;
2146 return 0;
2147
2148 out_qm_exit:
2149 xfs_qm_exit();
2150 out_remove_dbg_kobj:
2151 #ifdef DEBUG
2152 xfs_sysfs_del(&xfs_dbg_kobj);
2153 out_remove_stats_kobj:
2154 #endif
2155 xfs_sysfs_del(&xfsstats.xs_kobj);
2156 out_free_stats:
2157 free_percpu(xfsstats.xs_stats);
2158 out_kset_unregister:
2159 kset_unregister(xfs_kset);
2160 out_sysctl_unregister:
2161 xfs_sysctl_unregister();
2162 out_cleanup_procfs:
2163 xfs_cleanup_procfs();
2164 out_buf_terminate:
2165 xfs_buf_terminate();
2166 out_mru_cache_uninit:
2167 xfs_mru_cache_uninit();
2168 out_destroy_wq:
2169 xfs_destroy_workqueues();
2170 out_destroy_zones:
2171 xfs_destroy_zones();
2172 out:
2173 return error;
2174 }
2175
2176 STATIC void __exit
2177 exit_xfs_fs(void)
2178 {
2179 xfs_qm_exit();
2180 unregister_filesystem(&xfs_fs_type);
2181 #ifdef DEBUG
2182 xfs_sysfs_del(&xfs_dbg_kobj);
2183 #endif
2184 xfs_sysfs_del(&xfsstats.xs_kobj);
2185 free_percpu(xfsstats.xs_stats);
2186 kset_unregister(xfs_kset);
2187 xfs_sysctl_unregister();
2188 xfs_cleanup_procfs();
2189 xfs_buf_terminate();
2190 xfs_mru_cache_uninit();
2191 xfs_destroy_workqueues();
2192 xfs_destroy_zones();
2193 xfs_uuid_table_free();
2194 }
2195
2196 module_init(init_xfs_fs);
2197 module_exit(exit_xfs_fs);
2198
2199 MODULE_AUTHOR("Silicon Graphics, Inc.");
2200 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
2201 MODULE_LICENSE("GPL");
(deprecated) Btrfs devel tree