projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
fs: push sync_filesystem() down to the file system's remount_fs()
[deliverable/linux.git] / fs / jfs / super.c
1 /*
2 * Copyright (C) International Business Machines Corp., 2000-2004
3 * Portions Copyright (C) Christoph Hellwig, 2001-2002
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20 #include <linux/fs.h>
21 #include <linux/module.h>
22 #include <linux/parser.h>
23 #include <linux/completion.h>
24 #include <linux/vfs.h>
25 #include <linux/quotaops.h>
26 #include <linux/mount.h>
27 #include <linux/moduleparam.h>
28 #include <linux/kthread.h>
29 #include <linux/posix_acl.h>
30 #include <linux/buffer_head.h>
31 #include <linux/exportfs.h>
32 #include <linux/crc32.h>
33 #include <linux/slab.h>
34 #include <asm/uaccess.h>
35 #include <linux/seq_file.h>
36 #include <linux/blkdev.h>
37
38 #include "jfs_incore.h"
39 #include "jfs_filsys.h"
40 #include "jfs_inode.h"
41 #include "jfs_metapage.h"
42 #include "jfs_superblock.h"
43 #include "jfs_dmap.h"
44 #include "jfs_imap.h"
45 #include "jfs_acl.h"
46 #include "jfs_debug.h"
47 #include "jfs_xattr.h"
48
49 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
50 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
51 MODULE_LICENSE("GPL");
52
53 static struct kmem_cache * jfs_inode_cachep;
54
55 static const struct super_operations jfs_super_operations;
56 static const struct export_operations jfs_export_operations;
57 static struct file_system_type jfs_fs_type;
58
59 #define MAX_COMMIT_THREADS 64
60 static int commit_threads = 0;
61 module_param(commit_threads, int, 0);
62 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
63
64 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
65 struct task_struct *jfsIOthread;
66 struct task_struct *jfsSyncThread;
67
68 #ifdef CONFIG_JFS_DEBUG
69 int jfsloglevel = JFS_LOGLEVEL_WARN;
70 module_param(jfsloglevel, int, 0644);
71 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
72 #endif
73
74 static void jfs_handle_error(struct super_block *sb)
75 {
76 struct jfs_sb_info *sbi = JFS_SBI(sb);
77
78 if (sb->s_flags & MS_RDONLY)
79 return;
80
81 updateSuper(sb, FM_DIRTY);
82
83 if (sbi->flag & JFS_ERR_PANIC)
84 panic("JFS (device %s): panic forced after error\n",
85 sb->s_id);
86 else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
87 jfs_err("ERROR: (device %s): remounting filesystem "
88 "as read-only\n",
89 sb->s_id);
90 sb->s_flags |= MS_RDONLY;
91 }
92
93 /* nothing is done for continue beyond marking the superblock dirty */
94 }
95
96 void jfs_error(struct super_block *sb, const char *fmt, ...)
97 {
98 struct va_format vaf;
99 va_list args;
100
101 va_start(args, fmt);
102
103 vaf.fmt = fmt;
104 vaf.va = &args;
105
106 pr_err("ERROR: (device %s): %pf: %pV\n",
107 sb->s_id, __builtin_return_address(0), &vaf);
108
109 va_end(args);
110
111 jfs_handle_error(sb);
112 }
113
114 static struct inode *jfs_alloc_inode(struct super_block *sb)
115 {
116 struct jfs_inode_info *jfs_inode;
117
118 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
119 if (!jfs_inode)
120 return NULL;
121 return &jfs_inode->vfs_inode;
122 }
123
124 static void jfs_i_callback(struct rcu_head *head)
125 {
126 struct inode *inode = container_of(head, struct inode, i_rcu);
127 struct jfs_inode_info *ji = JFS_IP(inode);
128 kmem_cache_free(jfs_inode_cachep, ji);
129 }
130
131 static void jfs_destroy_inode(struct inode *inode)
132 {
133 struct jfs_inode_info *ji = JFS_IP(inode);
134
135 BUG_ON(!list_empty(&ji->anon_inode_list));
136
137 spin_lock_irq(&ji->ag_lock);
138 if (ji->active_ag != -1) {
139 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
140 atomic_dec(&bmap->db_active[ji->active_ag]);
141 ji->active_ag = -1;
142 }
143 spin_unlock_irq(&ji->ag_lock);
144 call_rcu(&inode->i_rcu, jfs_i_callback);
145 }
146
147 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
148 {
149 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
150 s64 maxinodes;
151 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
152
153 jfs_info("In jfs_statfs");
154 buf->f_type = JFS_SUPER_MAGIC;
155 buf->f_bsize = sbi->bsize;
156 buf->f_blocks = sbi->bmap->db_mapsize;
157 buf->f_bfree = sbi->bmap->db_nfree;
158 buf->f_bavail = sbi->bmap->db_nfree;
159 /*
160 * If we really return the number of allocated & free inodes, some
161 * applications will fail because they won't see enough free inodes.
162 * We'll try to calculate some guess as to how many inodes we can
163 * really allocate
164 *
165 * buf->f_files = atomic_read(&imap->im_numinos);
166 * buf->f_ffree = atomic_read(&imap->im_numfree);
167 */
168 maxinodes = min((s64) atomic_read(&imap->im_numinos) +
169 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
170 << L2INOSPEREXT), (s64) 0xffffffffLL);
171 buf->f_files = maxinodes;
172 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
173 atomic_read(&imap->im_numfree));
174 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
175 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
176 sizeof(sbi->uuid)/2);
177
178 buf->f_namelen = JFS_NAME_MAX;
179 return 0;
180 }
181
182 static void jfs_put_super(struct super_block *sb)
183 {
184 struct jfs_sb_info *sbi = JFS_SBI(sb);
185 int rc;
186
187 jfs_info("In jfs_put_super");
188
189 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
190
191 rc = jfs_umount(sb);
192 if (rc)
193 jfs_err("jfs_umount failed with return code %d", rc);
194
195 unload_nls(sbi->nls_tab);
196
197 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
198 iput(sbi->direct_inode);
199
200 kfree(sbi);
201 }
202
203 enum {
204 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
205 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
206 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask,
207 Opt_discard, Opt_nodiscard, Opt_discard_minblk
208 };
209
210 static const match_table_t tokens = {
211 {Opt_integrity, "integrity"},
212 {Opt_nointegrity, "nointegrity"},
213 {Opt_iocharset, "iocharset=%s"},
214 {Opt_resize, "resize=%u"},
215 {Opt_resize_nosize, "resize"},
216 {Opt_errors, "errors=%s"},
217 {Opt_ignore, "noquota"},
218 {Opt_ignore, "quota"},
219 {Opt_usrquota, "usrquota"},
220 {Opt_grpquota, "grpquota"},
221 {Opt_uid, "uid=%u"},
222 {Opt_gid, "gid=%u"},
223 {Opt_umask, "umask=%u"},
224 {Opt_discard, "discard"},
225 {Opt_nodiscard, "nodiscard"},
226 {Opt_discard_minblk, "discard=%u"},
227 {Opt_err, NULL}
228 };
229
230 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
231 int *flag)
232 {
233 void *nls_map = (void *)-1; /* -1: no change; NULL: none */
234 char *p;
235 struct jfs_sb_info *sbi = JFS_SBI(sb);
236
237 *newLVSize = 0;
238
239 if (!options)
240 return 1;
241
242 while ((p = strsep(&options, ",")) != NULL) {
243 substring_t args[MAX_OPT_ARGS];
244 int token;
245 if (!*p)
246 continue;
247
248 token = match_token(p, tokens, args);
249 switch (token) {
250 case Opt_integrity:
251 *flag &= ~JFS_NOINTEGRITY;
252 break;
253 case Opt_nointegrity:
254 *flag |= JFS_NOINTEGRITY;
255 break;
256 case Opt_ignore:
257 /* Silently ignore the quota options */
258 /* Don't do anything ;-) */
259 break;
260 case Opt_iocharset:
261 if (nls_map && nls_map != (void *) -1)
262 unload_nls(nls_map);
263 if (!strcmp(args[0].from, "none"))
264 nls_map = NULL;
265 else {
266 nls_map = load_nls(args[0].from);
267 if (!nls_map) {
268 pr_err("JFS: charset not found\n");
269 goto cleanup;
270 }
271 }
272 break;
273 case Opt_resize:
274 {
275 char *resize = args[0].from;
276 *newLVSize = simple_strtoull(resize, &resize, 0);
277 break;
278 }
279 case Opt_resize_nosize:
280 {
281 *newLVSize = sb->s_bdev->bd_inode->i_size >>
282 sb->s_blocksize_bits;
283 if (*newLVSize == 0)
284 pr_err("JFS: Cannot determine volume size\n");
285 break;
286 }
287 case Opt_errors:
288 {
289 char *errors = args[0].from;
290 if (!errors || !*errors)
291 goto cleanup;
292 if (!strcmp(errors, "continue")) {
293 *flag &= ~JFS_ERR_REMOUNT_RO;
294 *flag &= ~JFS_ERR_PANIC;
295 *flag |= JFS_ERR_CONTINUE;
296 } else if (!strcmp(errors, "remount-ro")) {
297 *flag &= ~JFS_ERR_CONTINUE;
298 *flag &= ~JFS_ERR_PANIC;
299 *flag |= JFS_ERR_REMOUNT_RO;
300 } else if (!strcmp(errors, "panic")) {
301 *flag &= ~JFS_ERR_CONTINUE;
302 *flag &= ~JFS_ERR_REMOUNT_RO;
303 *flag |= JFS_ERR_PANIC;
304 } else {
305 pr_err("JFS: %s is an invalid error handler\n",
306 errors);
307 goto cleanup;
308 }
309 break;
310 }
311
312 #ifdef CONFIG_QUOTA
313 case Opt_quota:
314 case Opt_usrquota:
315 *flag |= JFS_USRQUOTA;
316 break;
317 case Opt_grpquota:
318 *flag |= JFS_GRPQUOTA;
319 break;
320 #else
321 case Opt_usrquota:
322 case Opt_grpquota:
323 case Opt_quota:
324 pr_err("JFS: quota operations not supported\n");
325 break;
326 #endif
327 case Opt_uid:
328 {
329 char *uid = args[0].from;
330 uid_t val = simple_strtoul(uid, &uid, 0);
331 sbi->uid = make_kuid(current_user_ns(), val);
332 if (!uid_valid(sbi->uid))
333 goto cleanup;
334 break;
335 }
336
337 case Opt_gid:
338 {
339 char *gid = args[0].from;
340 gid_t val = simple_strtoul(gid, &gid, 0);
341 sbi->gid = make_kgid(current_user_ns(), val);
342 if (!gid_valid(sbi->gid))
343 goto cleanup;
344 break;
345 }
346
347 case Opt_umask:
348 {
349 char *umask = args[0].from;
350 sbi->umask = simple_strtoul(umask, &umask, 8);
351 if (sbi->umask & ~0777) {
352 pr_err("JFS: Invalid value of umask\n");
353 goto cleanup;
354 }
355 break;
356 }
357
358 case Opt_discard:
359 {
360 struct request_queue *q = bdev_get_queue(sb->s_bdev);
361 /* if set to 1, even copying files will cause
362 * trimming :O
363 * -> user has more control over the online trimming
364 */
365 sbi->minblks_trim = 64;
366 if (blk_queue_discard(q)) {
367 *flag |= JFS_DISCARD;
368 } else {
369 pr_err("JFS: discard option " \
370 "not supported on device\n");
371 }
372 break;
373 }
374
375 case Opt_nodiscard:
376 *flag &= ~JFS_DISCARD;
377 break;
378
379 case Opt_discard_minblk:
380 {
381 struct request_queue *q = bdev_get_queue(sb->s_bdev);
382 char *minblks_trim = args[0].from;
383 if (blk_queue_discard(q)) {
384 *flag |= JFS_DISCARD;
385 sbi->minblks_trim = simple_strtoull(
386 minblks_trim, &minblks_trim, 0);
387 } else {
388 pr_err("JFS: discard option " \
389 "not supported on device\n");
390 }
391 break;
392 }
393
394 default:
395 printk("jfs: Unrecognized mount option \"%s\" "
396 " or missing value\n", p);
397 goto cleanup;
398 }
399 }
400
401 if (nls_map != (void *) -1) {
402 /* Discard old (if remount) */
403 unload_nls(sbi->nls_tab);
404 sbi->nls_tab = nls_map;
405 }
406 return 1;
407
408 cleanup:
409 if (nls_map && nls_map != (void *) -1)
410 unload_nls(nls_map);
411 return 0;
412 }
413
414 static int jfs_remount(struct super_block *sb, int *flags, char *data)
415 {
416 s64 newLVSize = 0;
417 int rc = 0;
418 int flag = JFS_SBI(sb)->flag;
419 int ret;
420
421 sync_filesystem(sb);
422 if (!parse_options(data, sb, &newLVSize, &flag)) {
423 return -EINVAL;
424 }
425
426 if (newLVSize) {
427 if (sb->s_flags & MS_RDONLY) {
428 pr_err("JFS: resize requires volume" \
429 " to be mounted read-write\n");
430 return -EROFS;
431 }
432 rc = jfs_extendfs(sb, newLVSize, 0);
433 if (rc)
434 return rc;
435 }
436
437 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
438 /*
439 * Invalidate any previously read metadata. fsck may have
440 * changed the on-disk data since we mounted r/o
441 */
442 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
443
444 JFS_SBI(sb)->flag = flag;
445 ret = jfs_mount_rw(sb, 1);
446
447 /* mark the fs r/w for quota activity */
448 sb->s_flags &= ~MS_RDONLY;
449
450 dquot_resume(sb, -1);
451 return ret;
452 }
453 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
454 rc = dquot_suspend(sb, -1);
455 if (rc < 0) {
456 return rc;
457 }
458 rc = jfs_umount_rw(sb);
459 JFS_SBI(sb)->flag = flag;
460 return rc;
461 }
462 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
463 if (!(sb->s_flags & MS_RDONLY)) {
464 rc = jfs_umount_rw(sb);
465 if (rc)
466 return rc;
467
468 JFS_SBI(sb)->flag = flag;
469 ret = jfs_mount_rw(sb, 1);
470 return ret;
471 }
472 JFS_SBI(sb)->flag = flag;
473
474 return 0;
475 }
476
477 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
478 {
479 struct jfs_sb_info *sbi;
480 struct inode *inode;
481 int rc;
482 s64 newLVSize = 0;
483 int flag, ret = -EINVAL;
484
485 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
486
487 if (!new_valid_dev(sb->s_bdev->bd_dev))
488 return -EOVERFLOW;
489
490 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
491 if (!sbi)
492 return -ENOMEM;
493
494 sb->s_fs_info = sbi;
495 sb->s_max_links = JFS_LINK_MAX;
496 sbi->sb = sb;
497 sbi->uid = INVALID_UID;
498 sbi->gid = INVALID_GID;
499 sbi->umask = -1;
500
501 /* initialize the mount flag and determine the default error handler */
502 flag = JFS_ERR_REMOUNT_RO;
503
504 if (!parse_options((char *) data, sb, &newLVSize, &flag))
505 goto out_kfree;
506 sbi->flag = flag;
507
508 #ifdef CONFIG_JFS_POSIX_ACL
509 sb->s_flags |= MS_POSIXACL;
510 #endif
511
512 if (newLVSize) {
513 pr_err("resize option for remount only\n");
514 goto out_kfree;
515 }
516
517 /*
518 * Initialize blocksize to 4K.
519 */
520 sb_set_blocksize(sb, PSIZE);
521
522 /*
523 * Set method vectors.
524 */
525 sb->s_op = &jfs_super_operations;
526 sb->s_export_op = &jfs_export_operations;
527 sb->s_xattr = jfs_xattr_handlers;
528 #ifdef CONFIG_QUOTA
529 sb->dq_op = &dquot_operations;
530 sb->s_qcop = &dquot_quotactl_ops;
531 #endif
532
533 /*
534 * Initialize direct-mapping inode/address-space
535 */
536 inode = new_inode(sb);
537 if (inode == NULL) {
538 ret = -ENOMEM;
539 goto out_unload;
540 }
541 inode->i_ino = 0;
542 inode->i_size = sb->s_bdev->bd_inode->i_size;
543 inode->i_mapping->a_ops = &jfs_metapage_aops;
544 insert_inode_hash(inode);
545 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
546
547 sbi->direct_inode = inode;
548
549 rc = jfs_mount(sb);
550 if (rc) {
551 if (!silent) {
552 jfs_err("jfs_mount failed w/return code = %d", rc);
553 }
554 goto out_mount_failed;
555 }
556 if (sb->s_flags & MS_RDONLY)
557 sbi->log = NULL;
558 else {
559 rc = jfs_mount_rw(sb, 0);
560 if (rc) {
561 if (!silent) {
562 jfs_err("jfs_mount_rw failed, return code = %d",
563 rc);
564 }
565 goto out_no_rw;
566 }
567 }
568
569 sb->s_magic = JFS_SUPER_MAGIC;
570
571 if (sbi->mntflag & JFS_OS2)
572 sb->s_d_op = &jfs_ci_dentry_operations;
573
574 inode = jfs_iget(sb, ROOT_I);
575 if (IS_ERR(inode)) {
576 ret = PTR_ERR(inode);
577 goto out_no_rw;
578 }
579 sb->s_root = d_make_root(inode);
580 if (!sb->s_root)
581 goto out_no_root;
582
583 /* logical blocks are represented by 40 bits in pxd_t, etc. */
584 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
585 #if BITS_PER_LONG == 32
586 /*
587 * Page cache is indexed by long.
588 * I would use MAX_LFS_FILESIZE, but it's only half as big
589 */
590 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
591 #endif
592 sb->s_time_gran = 1;
593 return 0;
594
595 out_no_root:
596 jfs_err("jfs_read_super: get root dentry failed");
597
598 out_no_rw:
599 rc = jfs_umount(sb);
600 if (rc) {
601 jfs_err("jfs_umount failed with return code %d", rc);
602 }
603 out_mount_failed:
604 filemap_write_and_wait(sbi->direct_inode->i_mapping);
605 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
606 make_bad_inode(sbi->direct_inode);
607 iput(sbi->direct_inode);
608 sbi->direct_inode = NULL;
609 out_unload:
610 if (sbi->nls_tab)
611 unload_nls(sbi->nls_tab);
612 out_kfree:
613 kfree(sbi);
614 return ret;
615 }
616
617 static int jfs_freeze(struct super_block *sb)
618 {
619 struct jfs_sb_info *sbi = JFS_SBI(sb);
620 struct jfs_log *log = sbi->log;
621 int rc = 0;
622
623 if (!(sb->s_flags & MS_RDONLY)) {
624 txQuiesce(sb);
625 rc = lmLogShutdown(log);
626 if (rc) {
627 jfs_error(sb, "lmLogShutdown failed\n");
628
629 /* let operations fail rather than hang */
630 txResume(sb);
631
632 return rc;
633 }
634 rc = updateSuper(sb, FM_CLEAN);
635 if (rc) {
636 jfs_err("jfs_freeze: updateSuper failed\n");
637 /*
638 * Don't fail here. Everything succeeded except
639 * marking the superblock clean, so there's really
640 * no harm in leaving it frozen for now.
641 */
642 }
643 }
644 return 0;
645 }
646
647 static int jfs_unfreeze(struct super_block *sb)
648 {
649 struct jfs_sb_info *sbi = JFS_SBI(sb);
650 struct jfs_log *log = sbi->log;
651 int rc = 0;
652
653 if (!(sb->s_flags & MS_RDONLY)) {
654 rc = updateSuper(sb, FM_MOUNT);
655 if (rc) {
656 jfs_error(sb, "updateSuper failed\n");
657 goto out;
658 }
659 rc = lmLogInit(log);
660 if (rc)
661 jfs_error(sb, "lmLogInit failed\n");
662 out:
663 txResume(sb);
664 }
665 return rc;
666 }
667
668 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
669 int flags, const char *dev_name, void *data)
670 {
671 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
672 }
673
674 static int jfs_sync_fs(struct super_block *sb, int wait)
675 {
676 struct jfs_log *log = JFS_SBI(sb)->log;
677
678 /* log == NULL indicates read-only mount */
679 if (log) {
680 /*
681 * Write quota structures to quota file, sync_blockdev() will
682 * write them to disk later
683 */
684 dquot_writeback_dquots(sb, -1);
685 jfs_flush_journal(log, wait);
686 jfs_syncpt(log, 0);
687 }
688
689 return 0;
690 }
691
692 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
693 {
694 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
695
696 if (uid_valid(sbi->uid))
697 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
698 if (gid_valid(sbi->gid))
699 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
700 if (sbi->umask != -1)
701 seq_printf(seq, ",umask=%03o", sbi->umask);
702 if (sbi->flag & JFS_NOINTEGRITY)
703 seq_puts(seq, ",nointegrity");
704 if (sbi->flag & JFS_DISCARD)
705 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
706 if (sbi->nls_tab)
707 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
708 if (sbi->flag & JFS_ERR_CONTINUE)
709 seq_printf(seq, ",errors=continue");
710 if (sbi->flag & JFS_ERR_PANIC)
711 seq_printf(seq, ",errors=panic");
712
713 #ifdef CONFIG_QUOTA
714 if (sbi->flag & JFS_USRQUOTA)
715 seq_puts(seq, ",usrquota");
716
717 if (sbi->flag & JFS_GRPQUOTA)
718 seq_puts(seq, ",grpquota");
719 #endif
720
721 return 0;
722 }
723
724 #ifdef CONFIG_QUOTA
725
726 /* Read data from quotafile - avoid pagecache and such because we cannot afford
727 * acquiring the locks... As quota files are never truncated and quota code
728 * itself serializes the operations (and no one else should touch the files)
729 * we don't have to be afraid of races */
730 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
731 size_t len, loff_t off)
732 {
733 struct inode *inode = sb_dqopt(sb)->files[type];
734 sector_t blk = off >> sb->s_blocksize_bits;
735 int err = 0;
736 int offset = off & (sb->s_blocksize - 1);
737 int tocopy;
738 size_t toread;
739 struct buffer_head tmp_bh;
740 struct buffer_head *bh;
741 loff_t i_size = i_size_read(inode);
742
743 if (off > i_size)
744 return 0;
745 if (off+len > i_size)
746 len = i_size-off;
747 toread = len;
748 while (toread > 0) {
749 tocopy = sb->s_blocksize - offset < toread ?
750 sb->s_blocksize - offset : toread;
751
752 tmp_bh.b_state = 0;
753 tmp_bh.b_size = 1 << inode->i_blkbits;
754 err = jfs_get_block(inode, blk, &tmp_bh, 0);
755 if (err)
756 return err;
757 if (!buffer_mapped(&tmp_bh)) /* A hole? */
758 memset(data, 0, tocopy);
759 else {
760 bh = sb_bread(sb, tmp_bh.b_blocknr);
761 if (!bh)
762 return -EIO;
763 memcpy(data, bh->b_data+offset, tocopy);
764 brelse(bh);
765 }
766 offset = 0;
767 toread -= tocopy;
768 data += tocopy;
769 blk++;
770 }
771 return len;
772 }
773
774 /* Write to quotafile */
775 static ssize_t jfs_quota_write(struct super_block *sb, int type,
776 const char *data, size_t len, loff_t off)
777 {
778 struct inode *inode = sb_dqopt(sb)->files[type];
779 sector_t blk = off >> sb->s_blocksize_bits;
780 int err = 0;
781 int offset = off & (sb->s_blocksize - 1);
782 int tocopy;
783 size_t towrite = len;
784 struct buffer_head tmp_bh;
785 struct buffer_head *bh;
786
787 mutex_lock(&inode->i_mutex);
788 while (towrite > 0) {
789 tocopy = sb->s_blocksize - offset < towrite ?
790 sb->s_blocksize - offset : towrite;
791
792 tmp_bh.b_state = 0;
793 tmp_bh.b_size = 1 << inode->i_blkbits;
794 err = jfs_get_block(inode, blk, &tmp_bh, 1);
795 if (err)
796 goto out;
797 if (offset || tocopy != sb->s_blocksize)
798 bh = sb_bread(sb, tmp_bh.b_blocknr);
799 else
800 bh = sb_getblk(sb, tmp_bh.b_blocknr);
801 if (!bh) {
802 err = -EIO;
803 goto out;
804 }
805 lock_buffer(bh);
806 memcpy(bh->b_data+offset, data, tocopy);
807 flush_dcache_page(bh->b_page);
808 set_buffer_uptodate(bh);
809 mark_buffer_dirty(bh);
810 unlock_buffer(bh);
811 brelse(bh);
812 offset = 0;
813 towrite -= tocopy;
814 data += tocopy;
815 blk++;
816 }
817 out:
818 if (len == towrite) {
819 mutex_unlock(&inode->i_mutex);
820 return err;
821 }
822 if (inode->i_size < off+len-towrite)
823 i_size_write(inode, off+len-towrite);
824 inode->i_version++;
825 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
826 mark_inode_dirty(inode);
827 mutex_unlock(&inode->i_mutex);
828 return len - towrite;
829 }
830
831 #endif
832
833 static const struct super_operations jfs_super_operations = {
834 .alloc_inode = jfs_alloc_inode,
835 .destroy_inode = jfs_destroy_inode,
836 .dirty_inode = jfs_dirty_inode,
837 .write_inode = jfs_write_inode,
838 .evict_inode = jfs_evict_inode,
839 .put_super = jfs_put_super,
840 .sync_fs = jfs_sync_fs,
841 .freeze_fs = jfs_freeze,
842 .unfreeze_fs = jfs_unfreeze,
843 .statfs = jfs_statfs,
844 .remount_fs = jfs_remount,
845 .show_options = jfs_show_options,
846 #ifdef CONFIG_QUOTA
847 .quota_read = jfs_quota_read,
848 .quota_write = jfs_quota_write,
849 #endif
850 };
851
852 static const struct export_operations jfs_export_operations = {
853 .fh_to_dentry = jfs_fh_to_dentry,
854 .fh_to_parent = jfs_fh_to_parent,
855 .get_parent = jfs_get_parent,
856 };
857
858 static struct file_system_type jfs_fs_type = {
859 .owner = THIS_MODULE,
860 .name = "jfs",
861 .mount = jfs_do_mount,
862 .kill_sb = kill_block_super,
863 .fs_flags = FS_REQUIRES_DEV,
864 };
865 MODULE_ALIAS_FS("jfs");
866
867 static void init_once(void *foo)
868 {
869 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
870
871 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
872 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
873 init_rwsem(&jfs_ip->rdwrlock);
874 mutex_init(&jfs_ip->commit_mutex);
875 init_rwsem(&jfs_ip->xattr_sem);
876 spin_lock_init(&jfs_ip->ag_lock);
877 jfs_ip->active_ag = -1;
878 inode_init_once(&jfs_ip->vfs_inode);
879 }
880
881 static int __init init_jfs_fs(void)
882 {
883 int i;
884 int rc;
885
886 jfs_inode_cachep =
887 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
888 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
889 init_once);
890 if (jfs_inode_cachep == NULL)
891 return -ENOMEM;
892
893 /*
894 * Metapage initialization
895 */
896 rc = metapage_init();
897 if (rc) {
898 jfs_err("metapage_init failed w/rc = %d", rc);
899 goto free_slab;
900 }
901
902 /*
903 * Transaction Manager initialization
904 */
905 rc = txInit();
906 if (rc) {
907 jfs_err("txInit failed w/rc = %d", rc);
908 goto free_metapage;
909 }
910
911 /*
912 * I/O completion thread (endio)
913 */
914 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
915 if (IS_ERR(jfsIOthread)) {
916 rc = PTR_ERR(jfsIOthread);
917 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
918 goto end_txmngr;
919 }
920
921 if (commit_threads < 1)
922 commit_threads = num_online_cpus();
923 if (commit_threads > MAX_COMMIT_THREADS)
924 commit_threads = MAX_COMMIT_THREADS;
925
926 for (i = 0; i < commit_threads; i++) {
927 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
928 if (IS_ERR(jfsCommitThread[i])) {
929 rc = PTR_ERR(jfsCommitThread[i]);
930 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
931 commit_threads = i;
932 goto kill_committask;
933 }
934 }
935
936 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
937 if (IS_ERR(jfsSyncThread)) {
938 rc = PTR_ERR(jfsSyncThread);
939 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
940 goto kill_committask;
941 }
942
943 #ifdef PROC_FS_JFS
944 jfs_proc_init();
945 #endif
946
947 rc = register_filesystem(&jfs_fs_type);
948 if (!rc)
949 return 0;
950
951 #ifdef PROC_FS_JFS
952 jfs_proc_clean();
953 #endif
954 kthread_stop(jfsSyncThread);
955 kill_committask:
956 for (i = 0; i < commit_threads; i++)
957 kthread_stop(jfsCommitThread[i]);
958 kthread_stop(jfsIOthread);
959 end_txmngr:
960 txExit();
961 free_metapage:
962 metapage_exit();
963 free_slab:
964 kmem_cache_destroy(jfs_inode_cachep);
965 return rc;
966 }
967
968 static void __exit exit_jfs_fs(void)
969 {
970 int i;
971
972 jfs_info("exit_jfs_fs called");
973
974 txExit();
975 metapage_exit();
976
977 kthread_stop(jfsIOthread);
978 for (i = 0; i < commit_threads; i++)
979 kthread_stop(jfsCommitThread[i]);
980 kthread_stop(jfsSyncThread);
981 #ifdef PROC_FS_JFS
982 jfs_proc_clean();
983 #endif
984 unregister_filesystem(&jfs_fs_type);
985
986 /*
987 * Make sure all delayed rcu free inodes are flushed before we
988 * destroy cache.
989 */
990 rcu_barrier();
991 kmem_cache_destroy(jfs_inode_cachep);
992 }
993
994 module_init(init_jfs_fs)
995 module_exit(exit_jfs_fs)
Linux kernel - Deliverables
This page took 0.050301 seconds and 5 git commands to generate.