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Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target...
[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;
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 as read-only\n",
88 sb->s_id);
89 sb->s_flags |= MS_RDONLY;
90 }
91
92 /* nothing is done for continue beyond marking the superblock dirty */
93 }
94
95 void jfs_error(struct super_block *sb, const char *fmt, ...)
96 {
97 struct va_format vaf;
98 va_list args;
99
100 va_start(args, fmt);
101
102 vaf.fmt = fmt;
103 vaf.va = &args;
104
105 pr_err("ERROR: (device %s): %pf: %pV\n",
106 sb->s_id, __builtin_return_address(0), &vaf);
107
108 va_end(args);
109
110 jfs_handle_error(sb);
111 }
112
113 static struct inode *jfs_alloc_inode(struct super_block *sb)
114 {
115 struct jfs_inode_info *jfs_inode;
116
117 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
118 if (!jfs_inode)
119 return NULL;
120 return &jfs_inode->vfs_inode;
121 }
122
123 static void jfs_i_callback(struct rcu_head *head)
124 {
125 struct inode *inode = container_of(head, struct inode, i_rcu);
126 struct jfs_inode_info *ji = JFS_IP(inode);
127 kmem_cache_free(jfs_inode_cachep, ji);
128 }
129
130 static void jfs_destroy_inode(struct inode *inode)
131 {
132 struct jfs_inode_info *ji = JFS_IP(inode);
133
134 BUG_ON(!list_empty(&ji->anon_inode_list));
135
136 spin_lock_irq(&ji->ag_lock);
137 if (ji->active_ag != -1) {
138 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
139 atomic_dec(&bmap->db_active[ji->active_ag]);
140 ji->active_ag = -1;
141 }
142 spin_unlock_irq(&ji->ag_lock);
143 call_rcu(&inode->i_rcu, jfs_i_callback);
144 }
145
146 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
147 {
148 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
149 s64 maxinodes;
150 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
151
152 jfs_info("In jfs_statfs");
153 buf->f_type = JFS_SUPER_MAGIC;
154 buf->f_bsize = sbi->bsize;
155 buf->f_blocks = sbi->bmap->db_mapsize;
156 buf->f_bfree = sbi->bmap->db_nfree;
157 buf->f_bavail = sbi->bmap->db_nfree;
158 /*
159 * If we really return the number of allocated & free inodes, some
160 * applications will fail because they won't see enough free inodes.
161 * We'll try to calculate some guess as to how many inodes we can
162 * really allocate
163 *
164 * buf->f_files = atomic_read(&imap->im_numinos);
165 * buf->f_ffree = atomic_read(&imap->im_numfree);
166 */
167 maxinodes = min((s64) atomic_read(&imap->im_numinos) +
168 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
169 << L2INOSPEREXT), (s64) 0xffffffffLL);
170 buf->f_files = maxinodes;
171 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
172 atomic_read(&imap->im_numfree));
173 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
174 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
175 sizeof(sbi->uuid)/2);
176
177 buf->f_namelen = JFS_NAME_MAX;
178 return 0;
179 }
180
181 static void jfs_put_super(struct super_block *sb)
182 {
183 struct jfs_sb_info *sbi = JFS_SBI(sb);
184 int rc;
185
186 jfs_info("In jfs_put_super");
187
188 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
189
190 rc = jfs_umount(sb);
191 if (rc)
192 jfs_err("jfs_umount failed with return code %d", rc);
193
194 unload_nls(sbi->nls_tab);
195
196 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
197 iput(sbi->direct_inode);
198
199 kfree(sbi);
200 }
201
202 enum {
203 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
204 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
205 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask,
206 Opt_discard, Opt_nodiscard, Opt_discard_minblk
207 };
208
209 static const match_table_t tokens = {
210 {Opt_integrity, "integrity"},
211 {Opt_nointegrity, "nointegrity"},
212 {Opt_iocharset, "iocharset=%s"},
213 {Opt_resize, "resize=%u"},
214 {Opt_resize_nosize, "resize"},
215 {Opt_errors, "errors=%s"},
216 {Opt_ignore, "noquota"},
217 {Opt_ignore, "quota"},
218 {Opt_usrquota, "usrquota"},
219 {Opt_grpquota, "grpquota"},
220 {Opt_uid, "uid=%u"},
221 {Opt_gid, "gid=%u"},
222 {Opt_umask, "umask=%u"},
223 {Opt_discard, "discard"},
224 {Opt_nodiscard, "nodiscard"},
225 {Opt_discard_minblk, "discard=%u"},
226 {Opt_err, NULL}
227 };
228
229 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
230 int *flag)
231 {
232 void *nls_map = (void *)-1; /* -1: no change; NULL: none */
233 char *p;
234 struct jfs_sb_info *sbi = JFS_SBI(sb);
235
236 *newLVSize = 0;
237
238 if (!options)
239 return 1;
240
241 while ((p = strsep(&options, ",")) != NULL) {
242 substring_t args[MAX_OPT_ARGS];
243 int token;
244 if (!*p)
245 continue;
246
247 token = match_token(p, tokens, args);
248 switch (token) {
249 case Opt_integrity:
250 *flag &= ~JFS_NOINTEGRITY;
251 break;
252 case Opt_nointegrity:
253 *flag |= JFS_NOINTEGRITY;
254 break;
255 case Opt_ignore:
256 /* Silently ignore the quota options */
257 /* Don't do anything ;-) */
258 break;
259 case Opt_iocharset:
260 if (nls_map && nls_map != (void *) -1)
261 unload_nls(nls_map);
262 if (!strcmp(args[0].from, "none"))
263 nls_map = NULL;
264 else {
265 nls_map = load_nls(args[0].from);
266 if (!nls_map) {
267 pr_err("JFS: charset not found\n");
268 goto cleanup;
269 }
270 }
271 break;
272 case Opt_resize:
273 {
274 char *resize = args[0].from;
275 int rc = kstrtoll(resize, 0, newLVSize);
276
277 if (rc)
278 goto cleanup;
279 break;
280 }
281 case Opt_resize_nosize:
282 {
283 *newLVSize = sb->s_bdev->bd_inode->i_size >>
284 sb->s_blocksize_bits;
285 if (*newLVSize == 0)
286 pr_err("JFS: Cannot determine volume size\n");
287 break;
288 }
289 case Opt_errors:
290 {
291 char *errors = args[0].from;
292 if (!errors || !*errors)
293 goto cleanup;
294 if (!strcmp(errors, "continue")) {
295 *flag &= ~JFS_ERR_REMOUNT_RO;
296 *flag &= ~JFS_ERR_PANIC;
297 *flag |= JFS_ERR_CONTINUE;
298 } else if (!strcmp(errors, "remount-ro")) {
299 *flag &= ~JFS_ERR_CONTINUE;
300 *flag &= ~JFS_ERR_PANIC;
301 *flag |= JFS_ERR_REMOUNT_RO;
302 } else if (!strcmp(errors, "panic")) {
303 *flag &= ~JFS_ERR_CONTINUE;
304 *flag &= ~JFS_ERR_REMOUNT_RO;
305 *flag |= JFS_ERR_PANIC;
306 } else {
307 pr_err("JFS: %s is an invalid error handler\n",
308 errors);
309 goto cleanup;
310 }
311 break;
312 }
313
314 #ifdef CONFIG_QUOTA
315 case Opt_quota:
316 case Opt_usrquota:
317 *flag |= JFS_USRQUOTA;
318 break;
319 case Opt_grpquota:
320 *flag |= JFS_GRPQUOTA;
321 break;
322 #else
323 case Opt_usrquota:
324 case Opt_grpquota:
325 case Opt_quota:
326 pr_err("JFS: quota operations not supported\n");
327 break;
328 #endif
329 case Opt_uid:
330 {
331 char *uid = args[0].from;
332 uid_t val;
333 int rc = kstrtouint(uid, 0, &val);
334
335 if (rc)
336 goto cleanup;
337 sbi->uid = make_kuid(current_user_ns(), val);
338 if (!uid_valid(sbi->uid))
339 goto cleanup;
340 break;
341 }
342
343 case Opt_gid:
344 {
345 char *gid = args[0].from;
346 gid_t val;
347 int rc = kstrtouint(gid, 0, &val);
348
349 if (rc)
350 goto cleanup;
351 sbi->gid = make_kgid(current_user_ns(), val);
352 if (!gid_valid(sbi->gid))
353 goto cleanup;
354 break;
355 }
356
357 case Opt_umask:
358 {
359 char *umask = args[0].from;
360 int rc = kstrtouint(umask, 8, &sbi->umask);
361
362 if (rc)
363 goto cleanup;
364 if (sbi->umask & ~0777) {
365 pr_err("JFS: Invalid value of umask\n");
366 goto cleanup;
367 }
368 break;
369 }
370
371 case Opt_discard:
372 {
373 struct request_queue *q = bdev_get_queue(sb->s_bdev);
374 /* if set to 1, even copying files will cause
375 * trimming :O
376 * -> user has more control over the online trimming
377 */
378 sbi->minblks_trim = 64;
379 if (blk_queue_discard(q))
380 *flag |= JFS_DISCARD;
381 else
382 pr_err("JFS: discard option not supported on device\n");
383 break;
384 }
385
386 case Opt_nodiscard:
387 *flag &= ~JFS_DISCARD;
388 break;
389
390 case Opt_discard_minblk:
391 {
392 struct request_queue *q = bdev_get_queue(sb->s_bdev);
393 char *minblks_trim = args[0].from;
394 int rc;
395 if (blk_queue_discard(q)) {
396 *flag |= JFS_DISCARD;
397 rc = kstrtouint(minblks_trim, 0,
398 &sbi->minblks_trim);
399 if (rc)
400 goto cleanup;
401 } else
402 pr_err("JFS: discard option not supported on device\n");
403 break;
404 }
405
406 default:
407 printk("jfs: Unrecognized mount option \"%s\" or missing value\n",
408 p);
409 goto cleanup;
410 }
411 }
412
413 if (nls_map != (void *) -1) {
414 /* Discard old (if remount) */
415 unload_nls(sbi->nls_tab);
416 sbi->nls_tab = nls_map;
417 }
418 return 1;
419
420 cleanup:
421 if (nls_map && nls_map != (void *) -1)
422 unload_nls(nls_map);
423 return 0;
424 }
425
426 static int jfs_remount(struct super_block *sb, int *flags, char *data)
427 {
428 s64 newLVSize = 0;
429 int rc = 0;
430 int flag = JFS_SBI(sb)->flag;
431 int ret;
432
433 sync_filesystem(sb);
434 if (!parse_options(data, sb, &newLVSize, &flag))
435 return -EINVAL;
436
437 if (newLVSize) {
438 if (sb->s_flags & MS_RDONLY) {
439 pr_err("JFS: resize requires volume to be mounted read-write\n");
440 return -EROFS;
441 }
442 rc = jfs_extendfs(sb, newLVSize, 0);
443 if (rc)
444 return rc;
445 }
446
447 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
448 /*
449 * Invalidate any previously read metadata. fsck may have
450 * changed the on-disk data since we mounted r/o
451 */
452 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
453
454 JFS_SBI(sb)->flag = flag;
455 ret = jfs_mount_rw(sb, 1);
456
457 /* mark the fs r/w for quota activity */
458 sb->s_flags &= ~MS_RDONLY;
459
460 dquot_resume(sb, -1);
461 return ret;
462 }
463 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
464 rc = dquot_suspend(sb, -1);
465 if (rc < 0)
466 return rc;
467 rc = jfs_umount_rw(sb);
468 JFS_SBI(sb)->flag = flag;
469 return rc;
470 }
471 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
472 if (!(sb->s_flags & MS_RDONLY)) {
473 rc = jfs_umount_rw(sb);
474 if (rc)
475 return rc;
476
477 JFS_SBI(sb)->flag = flag;
478 ret = jfs_mount_rw(sb, 1);
479 return ret;
480 }
481 JFS_SBI(sb)->flag = flag;
482
483 return 0;
484 }
485
486 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
487 {
488 struct jfs_sb_info *sbi;
489 struct inode *inode;
490 int rc;
491 s64 newLVSize = 0;
492 int flag, ret = -EINVAL;
493
494 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
495
496 if (!new_valid_dev(sb->s_bdev->bd_dev))
497 return -EOVERFLOW;
498
499 sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL);
500 if (!sbi)
501 return -ENOMEM;
502
503 sb->s_fs_info = sbi;
504 sb->s_max_links = JFS_LINK_MAX;
505 sbi->sb = sb;
506 sbi->uid = INVALID_UID;
507 sbi->gid = INVALID_GID;
508 sbi->umask = -1;
509
510 /* initialize the mount flag and determine the default error handler */
511 flag = JFS_ERR_REMOUNT_RO;
512
513 if (!parse_options((char *) data, sb, &newLVSize, &flag))
514 goto out_kfree;
515 sbi->flag = flag;
516
517 #ifdef CONFIG_JFS_POSIX_ACL
518 sb->s_flags |= MS_POSIXACL;
519 #endif
520
521 if (newLVSize) {
522 pr_err("resize option for remount only\n");
523 goto out_kfree;
524 }
525
526 /*
527 * Initialize blocksize to 4K.
528 */
529 sb_set_blocksize(sb, PSIZE);
530
531 /*
532 * Set method vectors.
533 */
534 sb->s_op = &jfs_super_operations;
535 sb->s_export_op = &jfs_export_operations;
536 sb->s_xattr = jfs_xattr_handlers;
537 #ifdef CONFIG_QUOTA
538 sb->dq_op = &dquot_operations;
539 sb->s_qcop = &dquot_quotactl_ops;
540 #endif
541
542 /*
543 * Initialize direct-mapping inode/address-space
544 */
545 inode = new_inode(sb);
546 if (inode == NULL) {
547 ret = -ENOMEM;
548 goto out_unload;
549 }
550 inode->i_ino = 0;
551 inode->i_size = sb->s_bdev->bd_inode->i_size;
552 inode->i_mapping->a_ops = &jfs_metapage_aops;
553 insert_inode_hash(inode);
554 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
555
556 sbi->direct_inode = inode;
557
558 rc = jfs_mount(sb);
559 if (rc) {
560 if (!silent)
561 jfs_err("jfs_mount failed w/return code = %d", rc);
562 goto out_mount_failed;
563 }
564 if (sb->s_flags & MS_RDONLY)
565 sbi->log = NULL;
566 else {
567 rc = jfs_mount_rw(sb, 0);
568 if (rc) {
569 if (!silent) {
570 jfs_err("jfs_mount_rw failed, return code = %d",
571 rc);
572 }
573 goto out_no_rw;
574 }
575 }
576
577 sb->s_magic = JFS_SUPER_MAGIC;
578
579 if (sbi->mntflag & JFS_OS2)
580 sb->s_d_op = &jfs_ci_dentry_operations;
581
582 inode = jfs_iget(sb, ROOT_I);
583 if (IS_ERR(inode)) {
584 ret = PTR_ERR(inode);
585 goto out_no_rw;
586 }
587 sb->s_root = d_make_root(inode);
588 if (!sb->s_root)
589 goto out_no_root;
590
591 /* logical blocks are represented by 40 bits in pxd_t, etc. */
592 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
593 #if BITS_PER_LONG == 32
594 /*
595 * Page cache is indexed by long.
596 * I would use MAX_LFS_FILESIZE, but it's only half as big
597 */
598 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1,
599 (u64)sb->s_maxbytes);
600 #endif
601 sb->s_time_gran = 1;
602 return 0;
603
604 out_no_root:
605 jfs_err("jfs_read_super: get root dentry failed");
606
607 out_no_rw:
608 rc = jfs_umount(sb);
609 if (rc)
610 jfs_err("jfs_umount failed with return code %d", rc);
611 out_mount_failed:
612 filemap_write_and_wait(sbi->direct_inode->i_mapping);
613 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
614 make_bad_inode(sbi->direct_inode);
615 iput(sbi->direct_inode);
616 sbi->direct_inode = NULL;
617 out_unload:
618 if (sbi->nls_tab)
619 unload_nls(sbi->nls_tab);
620 out_kfree:
621 kfree(sbi);
622 return ret;
623 }
624
625 static int jfs_freeze(struct super_block *sb)
626 {
627 struct jfs_sb_info *sbi = JFS_SBI(sb);
628 struct jfs_log *log = sbi->log;
629 int rc = 0;
630
631 if (!(sb->s_flags & MS_RDONLY)) {
632 txQuiesce(sb);
633 rc = lmLogShutdown(log);
634 if (rc) {
635 jfs_error(sb, "lmLogShutdown failed\n");
636
637 /* let operations fail rather than hang */
638 txResume(sb);
639
640 return rc;
641 }
642 rc = updateSuper(sb, FM_CLEAN);
643 if (rc) {
644 jfs_err("jfs_freeze: updateSuper failed\n");
645 /*
646 * Don't fail here. Everything succeeded except
647 * marking the superblock clean, so there's really
648 * no harm in leaving it frozen for now.
649 */
650 }
651 }
652 return 0;
653 }
654
655 static int jfs_unfreeze(struct super_block *sb)
656 {
657 struct jfs_sb_info *sbi = JFS_SBI(sb);
658 struct jfs_log *log = sbi->log;
659 int rc = 0;
660
661 if (!(sb->s_flags & MS_RDONLY)) {
662 rc = updateSuper(sb, FM_MOUNT);
663 if (rc) {
664 jfs_error(sb, "updateSuper failed\n");
665 goto out;
666 }
667 rc = lmLogInit(log);
668 if (rc)
669 jfs_error(sb, "lmLogInit failed\n");
670 out:
671 txResume(sb);
672 }
673 return rc;
674 }
675
676 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
677 int flags, const char *dev_name, void *data)
678 {
679 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
680 }
681
682 static int jfs_sync_fs(struct super_block *sb, int wait)
683 {
684 struct jfs_log *log = JFS_SBI(sb)->log;
685
686 /* log == NULL indicates read-only mount */
687 if (log) {
688 /*
689 * Write quota structures to quota file, sync_blockdev() will
690 * write them to disk later
691 */
692 dquot_writeback_dquots(sb, -1);
693 jfs_flush_journal(log, wait);
694 jfs_syncpt(log, 0);
695 }
696
697 return 0;
698 }
699
700 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
701 {
702 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
703
704 if (uid_valid(sbi->uid))
705 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
706 if (gid_valid(sbi->gid))
707 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
708 if (sbi->umask != -1)
709 seq_printf(seq, ",umask=%03o", sbi->umask);
710 if (sbi->flag & JFS_NOINTEGRITY)
711 seq_puts(seq, ",nointegrity");
712 if (sbi->flag & JFS_DISCARD)
713 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
714 if (sbi->nls_tab)
715 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
716 if (sbi->flag & JFS_ERR_CONTINUE)
717 seq_printf(seq, ",errors=continue");
718 if (sbi->flag & JFS_ERR_PANIC)
719 seq_printf(seq, ",errors=panic");
720
721 #ifdef CONFIG_QUOTA
722 if (sbi->flag & JFS_USRQUOTA)
723 seq_puts(seq, ",usrquota");
724
725 if (sbi->flag & JFS_GRPQUOTA)
726 seq_puts(seq, ",grpquota");
727 #endif
728
729 return 0;
730 }
731
732 #ifdef CONFIG_QUOTA
733
734 /* Read data from quotafile - avoid pagecache and such because we cannot afford
735 * acquiring the locks... As quota files are never truncated and quota code
736 * itself serializes the operations (and no one else should touch the files)
737 * we don't have to be afraid of races */
738 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
739 size_t len, loff_t off)
740 {
741 struct inode *inode = sb_dqopt(sb)->files[type];
742 sector_t blk = off >> sb->s_blocksize_bits;
743 int err = 0;
744 int offset = off & (sb->s_blocksize - 1);
745 int tocopy;
746 size_t toread;
747 struct buffer_head tmp_bh;
748 struct buffer_head *bh;
749 loff_t i_size = i_size_read(inode);
750
751 if (off > i_size)
752 return 0;
753 if (off+len > i_size)
754 len = i_size-off;
755 toread = len;
756 while (toread > 0) {
757 tocopy = sb->s_blocksize - offset < toread ?
758 sb->s_blocksize - offset : toread;
759
760 tmp_bh.b_state = 0;
761 tmp_bh.b_size = 1 << inode->i_blkbits;
762 err = jfs_get_block(inode, blk, &tmp_bh, 0);
763 if (err)
764 return err;
765 if (!buffer_mapped(&tmp_bh)) /* A hole? */
766 memset(data, 0, tocopy);
767 else {
768 bh = sb_bread(sb, tmp_bh.b_blocknr);
769 if (!bh)
770 return -EIO;
771 memcpy(data, bh->b_data+offset, tocopy);
772 brelse(bh);
773 }
774 offset = 0;
775 toread -= tocopy;
776 data += tocopy;
777 blk++;
778 }
779 return len;
780 }
781
782 /* Write to quotafile */
783 static ssize_t jfs_quota_write(struct super_block *sb, int type,
784 const char *data, size_t len, loff_t off)
785 {
786 struct inode *inode = sb_dqopt(sb)->files[type];
787 sector_t blk = off >> sb->s_blocksize_bits;
788 int err = 0;
789 int offset = off & (sb->s_blocksize - 1);
790 int tocopy;
791 size_t towrite = len;
792 struct buffer_head tmp_bh;
793 struct buffer_head *bh;
794
795 mutex_lock(&inode->i_mutex);
796 while (towrite > 0) {
797 tocopy = sb->s_blocksize - offset < towrite ?
798 sb->s_blocksize - offset : towrite;
799
800 tmp_bh.b_state = 0;
801 tmp_bh.b_size = 1 << inode->i_blkbits;
802 err = jfs_get_block(inode, blk, &tmp_bh, 1);
803 if (err)
804 goto out;
805 if (offset || tocopy != sb->s_blocksize)
806 bh = sb_bread(sb, tmp_bh.b_blocknr);
807 else
808 bh = sb_getblk(sb, tmp_bh.b_blocknr);
809 if (!bh) {
810 err = -EIO;
811 goto out;
812 }
813 lock_buffer(bh);
814 memcpy(bh->b_data+offset, data, tocopy);
815 flush_dcache_page(bh->b_page);
816 set_buffer_uptodate(bh);
817 mark_buffer_dirty(bh);
818 unlock_buffer(bh);
819 brelse(bh);
820 offset = 0;
821 towrite -= tocopy;
822 data += tocopy;
823 blk++;
824 }
825 out:
826 if (len == towrite) {
827 mutex_unlock(&inode->i_mutex);
828 return err;
829 }
830 if (inode->i_size < off+len-towrite)
831 i_size_write(inode, off+len-towrite);
832 inode->i_version++;
833 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
834 mark_inode_dirty(inode);
835 mutex_unlock(&inode->i_mutex);
836 return len - towrite;
837 }
838
839 #endif
840
841 static const struct super_operations jfs_super_operations = {
842 .alloc_inode = jfs_alloc_inode,
843 .destroy_inode = jfs_destroy_inode,
844 .dirty_inode = jfs_dirty_inode,
845 .write_inode = jfs_write_inode,
846 .evict_inode = jfs_evict_inode,
847 .put_super = jfs_put_super,
848 .sync_fs = jfs_sync_fs,
849 .freeze_fs = jfs_freeze,
850 .unfreeze_fs = jfs_unfreeze,
851 .statfs = jfs_statfs,
852 .remount_fs = jfs_remount,
853 .show_options = jfs_show_options,
854 #ifdef CONFIG_QUOTA
855 .quota_read = jfs_quota_read,
856 .quota_write = jfs_quota_write,
857 #endif
858 };
859
860 static const struct export_operations jfs_export_operations = {
861 .fh_to_dentry = jfs_fh_to_dentry,
862 .fh_to_parent = jfs_fh_to_parent,
863 .get_parent = jfs_get_parent,
864 };
865
866 static struct file_system_type jfs_fs_type = {
867 .owner = THIS_MODULE,
868 .name = "jfs",
869 .mount = jfs_do_mount,
870 .kill_sb = kill_block_super,
871 .fs_flags = FS_REQUIRES_DEV,
872 };
873 MODULE_ALIAS_FS("jfs");
874
875 static void init_once(void *foo)
876 {
877 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
878
879 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
880 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
881 init_rwsem(&jfs_ip->rdwrlock);
882 mutex_init(&jfs_ip->commit_mutex);
883 init_rwsem(&jfs_ip->xattr_sem);
884 spin_lock_init(&jfs_ip->ag_lock);
885 jfs_ip->active_ag = -1;
886 inode_init_once(&jfs_ip->vfs_inode);
887 }
888
889 static int __init init_jfs_fs(void)
890 {
891 int i;
892 int rc;
893
894 jfs_inode_cachep =
895 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
896 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
897 init_once);
898 if (jfs_inode_cachep == NULL)
899 return -ENOMEM;
900
901 /*
902 * Metapage initialization
903 */
904 rc = metapage_init();
905 if (rc) {
906 jfs_err("metapage_init failed w/rc = %d", rc);
907 goto free_slab;
908 }
909
910 /*
911 * Transaction Manager initialization
912 */
913 rc = txInit();
914 if (rc) {
915 jfs_err("txInit failed w/rc = %d", rc);
916 goto free_metapage;
917 }
918
919 /*
920 * I/O completion thread (endio)
921 */
922 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
923 if (IS_ERR(jfsIOthread)) {
924 rc = PTR_ERR(jfsIOthread);
925 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
926 goto end_txmngr;
927 }
928
929 if (commit_threads < 1)
930 commit_threads = num_online_cpus();
931 if (commit_threads > MAX_COMMIT_THREADS)
932 commit_threads = MAX_COMMIT_THREADS;
933
934 for (i = 0; i < commit_threads; i++) {
935 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
936 "jfsCommit");
937 if (IS_ERR(jfsCommitThread[i])) {
938 rc = PTR_ERR(jfsCommitThread[i]);
939 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
940 commit_threads = i;
941 goto kill_committask;
942 }
943 }
944
945 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
946 if (IS_ERR(jfsSyncThread)) {
947 rc = PTR_ERR(jfsSyncThread);
948 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
949 goto kill_committask;
950 }
951
952 #ifdef PROC_FS_JFS
953 jfs_proc_init();
954 #endif
955
956 rc = register_filesystem(&jfs_fs_type);
957 if (!rc)
958 return 0;
959
960 #ifdef PROC_FS_JFS
961 jfs_proc_clean();
962 #endif
963 kthread_stop(jfsSyncThread);
964 kill_committask:
965 for (i = 0; i < commit_threads; i++)
966 kthread_stop(jfsCommitThread[i]);
967 kthread_stop(jfsIOthread);
968 end_txmngr:
969 txExit();
970 free_metapage:
971 metapage_exit();
972 free_slab:
973 kmem_cache_destroy(jfs_inode_cachep);
974 return rc;
975 }
976
977 static void __exit exit_jfs_fs(void)
978 {
979 int i;
980
981 jfs_info("exit_jfs_fs called");
982
983 txExit();
984 metapage_exit();
985
986 kthread_stop(jfsIOthread);
987 for (i = 0; i < commit_threads; i++)
988 kthread_stop(jfsCommitThread[i]);
989 kthread_stop(jfsSyncThread);
990 #ifdef PROC_FS_JFS
991 jfs_proc_clean();
992 #endif
993 unregister_filesystem(&jfs_fs_type);
994
995 /*
996 * Make sure all delayed rcu free inodes are flushed before we
997 * destroy cache.
998 */
999 rcu_barrier();
1000 kmem_cache_destroy(jfs_inode_cachep);
1001 }
1002
1003 module_init(init_jfs_fs)
1004 module_exit(exit_jfs_fs)
Linux kernel - Deliverables
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