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[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 if (!parse_options(data, sb, &newLVSize, &flag)) {
422 return -EINVAL;
423 }
424
425 if (newLVSize) {
426 if (sb->s_flags & MS_RDONLY) {
427 pr_err("JFS: resize requires volume" \
428 " to be mounted read-write\n");
429 return -EROFS;
430 }
431 rc = jfs_extendfs(sb, newLVSize, 0);
432 if (rc)
433 return rc;
434 }
435
436 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
437 /*
438 * Invalidate any previously read metadata. fsck may have
439 * changed the on-disk data since we mounted r/o
440 */
441 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
442
443 JFS_SBI(sb)->flag = flag;
444 ret = jfs_mount_rw(sb, 1);
445
446 /* mark the fs r/w for quota activity */
447 sb->s_flags &= ~MS_RDONLY;
448
449 dquot_resume(sb, -1);
450 return ret;
451 }
452 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
453 rc = dquot_suspend(sb, -1);
454 if (rc < 0) {
455 return rc;
456 }
457 rc = jfs_umount_rw(sb);
458 JFS_SBI(sb)->flag = flag;
459 return rc;
460 }
461 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
462 if (!(sb->s_flags & MS_RDONLY)) {
463 rc = jfs_umount_rw(sb);
464 if (rc)
465 return rc;
466
467 JFS_SBI(sb)->flag = flag;
468 ret = jfs_mount_rw(sb, 1);
469 return ret;
470 }
471 JFS_SBI(sb)->flag = flag;
472
473 return 0;
474 }
475
476 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
477 {
478 struct jfs_sb_info *sbi;
479 struct inode *inode;
480 int rc;
481 s64 newLVSize = 0;
482 int flag, ret = -EINVAL;
483
484 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
485
486 if (!new_valid_dev(sb->s_bdev->bd_dev))
487 return -EOVERFLOW;
488
489 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
490 if (!sbi)
491 return -ENOMEM;
492
493 sb->s_fs_info = sbi;
494 sb->s_max_links = JFS_LINK_MAX;
495 sbi->sb = sb;
496 sbi->uid = INVALID_UID;
497 sbi->gid = INVALID_GID;
498 sbi->umask = -1;
499
500 /* initialize the mount flag and determine the default error handler */
501 flag = JFS_ERR_REMOUNT_RO;
502
503 if (!parse_options((char *) data, sb, &newLVSize, &flag))
504 goto out_kfree;
505 sbi->flag = flag;
506
507 #ifdef CONFIG_JFS_POSIX_ACL
508 sb->s_flags |= MS_POSIXACL;
509 #endif
510
511 if (newLVSize) {
512 pr_err("resize option for remount only\n");
513 goto out_kfree;
514 }
515
516 /*
517 * Initialize blocksize to 4K.
518 */
519 sb_set_blocksize(sb, PSIZE);
520
521 /*
522 * Set method vectors.
523 */
524 sb->s_op = &jfs_super_operations;
525 sb->s_export_op = &jfs_export_operations;
526 sb->s_xattr = jfs_xattr_handlers;
527 #ifdef CONFIG_QUOTA
528 sb->dq_op = &dquot_operations;
529 sb->s_qcop = &dquot_quotactl_ops;
530 #endif
531
532 /*
533 * Initialize direct-mapping inode/address-space
534 */
535 inode = new_inode(sb);
536 if (inode == NULL) {
537 ret = -ENOMEM;
538 goto out_unload;
539 }
540 inode->i_ino = 0;
541 inode->i_size = sb->s_bdev->bd_inode->i_size;
542 inode->i_mapping->a_ops = &jfs_metapage_aops;
543 insert_inode_hash(inode);
544 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
545
546 sbi->direct_inode = inode;
547
548 rc = jfs_mount(sb);
549 if (rc) {
550 if (!silent) {
551 jfs_err("jfs_mount failed w/return code = %d", rc);
552 }
553 goto out_mount_failed;
554 }
555 if (sb->s_flags & MS_RDONLY)
556 sbi->log = NULL;
557 else {
558 rc = jfs_mount_rw(sb, 0);
559 if (rc) {
560 if (!silent) {
561 jfs_err("jfs_mount_rw failed, return code = %d",
562 rc);
563 }
564 goto out_no_rw;
565 }
566 }
567
568 sb->s_magic = JFS_SUPER_MAGIC;
569
570 if (sbi->mntflag & JFS_OS2)
571 sb->s_d_op = &jfs_ci_dentry_operations;
572
573 inode = jfs_iget(sb, ROOT_I);
574 if (IS_ERR(inode)) {
575 ret = PTR_ERR(inode);
576 goto out_no_rw;
577 }
578 sb->s_root = d_make_root(inode);
579 if (!sb->s_root)
580 goto out_no_root;
581
582 /* logical blocks are represented by 40 bits in pxd_t, etc. */
583 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
584 #if BITS_PER_LONG == 32
585 /*
586 * Page cache is indexed by long.
587 * I would use MAX_LFS_FILESIZE, but it's only half as big
588 */
589 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
590 #endif
591 sb->s_time_gran = 1;
592 return 0;
593
594 out_no_root:
595 jfs_err("jfs_read_super: get root dentry failed");
596
597 out_no_rw:
598 rc = jfs_umount(sb);
599 if (rc) {
600 jfs_err("jfs_umount failed with return code %d", rc);
601 }
602 out_mount_failed:
603 filemap_write_and_wait(sbi->direct_inode->i_mapping);
604 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
605 make_bad_inode(sbi->direct_inode);
606 iput(sbi->direct_inode);
607 sbi->direct_inode = NULL;
608 out_unload:
609 if (sbi->nls_tab)
610 unload_nls(sbi->nls_tab);
611 out_kfree:
612 kfree(sbi);
613 return ret;
614 }
615
616 static int jfs_freeze(struct super_block *sb)
617 {
618 struct jfs_sb_info *sbi = JFS_SBI(sb);
619 struct jfs_log *log = sbi->log;
620 int rc = 0;
621
622 if (!(sb->s_flags & MS_RDONLY)) {
623 txQuiesce(sb);
624 rc = lmLogShutdown(log);
625 if (rc) {
626 jfs_error(sb, "lmLogShutdown failed\n");
627
628 /* let operations fail rather than hang */
629 txResume(sb);
630
631 return rc;
632 }
633 rc = updateSuper(sb, FM_CLEAN);
634 if (rc) {
635 jfs_err("jfs_freeze: updateSuper failed\n");
636 /*
637 * Don't fail here. Everything succeeded except
638 * marking the superblock clean, so there's really
639 * no harm in leaving it frozen for now.
640 */
641 }
642 }
643 return 0;
644 }
645
646 static int jfs_unfreeze(struct super_block *sb)
647 {
648 struct jfs_sb_info *sbi = JFS_SBI(sb);
649 struct jfs_log *log = sbi->log;
650 int rc = 0;
651
652 if (!(sb->s_flags & MS_RDONLY)) {
653 rc = updateSuper(sb, FM_MOUNT);
654 if (rc) {
655 jfs_error(sb, "updateSuper failed\n");
656 goto out;
657 }
658 rc = lmLogInit(log);
659 if (rc)
660 jfs_error(sb, "lmLogInit failed\n");
661 out:
662 txResume(sb);
663 }
664 return rc;
665 }
666
667 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
668 int flags, const char *dev_name, void *data)
669 {
670 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
671 }
672
673 static int jfs_sync_fs(struct super_block *sb, int wait)
674 {
675 struct jfs_log *log = JFS_SBI(sb)->log;
676
677 /* log == NULL indicates read-only mount */
678 if (log) {
679 /*
680 * Write quota structures to quota file, sync_blockdev() will
681 * write them to disk later
682 */
683 dquot_writeback_dquots(sb, -1);
684 jfs_flush_journal(log, wait);
685 jfs_syncpt(log, 0);
686 }
687
688 return 0;
689 }
690
691 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
692 {
693 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
694
695 if (uid_valid(sbi->uid))
696 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
697 if (gid_valid(sbi->gid))
698 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
699 if (sbi->umask != -1)
700 seq_printf(seq, ",umask=%03o", sbi->umask);
701 if (sbi->flag & JFS_NOINTEGRITY)
702 seq_puts(seq, ",nointegrity");
703 if (sbi->flag & JFS_DISCARD)
704 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
705 if (sbi->nls_tab)
706 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
707 if (sbi->flag & JFS_ERR_CONTINUE)
708 seq_printf(seq, ",errors=continue");
709 if (sbi->flag & JFS_ERR_PANIC)
710 seq_printf(seq, ",errors=panic");
711
712 #ifdef CONFIG_QUOTA
713 if (sbi->flag & JFS_USRQUOTA)
714 seq_puts(seq, ",usrquota");
715
716 if (sbi->flag & JFS_GRPQUOTA)
717 seq_puts(seq, ",grpquota");
718 #endif
719
720 return 0;
721 }
722
723 #ifdef CONFIG_QUOTA
724
725 /* Read data from quotafile - avoid pagecache and such because we cannot afford
726 * acquiring the locks... As quota files are never truncated and quota code
727 * itself serializes the operations (and no one else should touch the files)
728 * we don't have to be afraid of races */
729 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
730 size_t len, loff_t off)
731 {
732 struct inode *inode = sb_dqopt(sb)->files[type];
733 sector_t blk = off >> sb->s_blocksize_bits;
734 int err = 0;
735 int offset = off & (sb->s_blocksize - 1);
736 int tocopy;
737 size_t toread;
738 struct buffer_head tmp_bh;
739 struct buffer_head *bh;
740 loff_t i_size = i_size_read(inode);
741
742 if (off > i_size)
743 return 0;
744 if (off+len > i_size)
745 len = i_size-off;
746 toread = len;
747 while (toread > 0) {
748 tocopy = sb->s_blocksize - offset < toread ?
749 sb->s_blocksize - offset : toread;
750
751 tmp_bh.b_state = 0;
752 tmp_bh.b_size = 1 << inode->i_blkbits;
753 err = jfs_get_block(inode, blk, &tmp_bh, 0);
754 if (err)
755 return err;
756 if (!buffer_mapped(&tmp_bh)) /* A hole? */
757 memset(data, 0, tocopy);
758 else {
759 bh = sb_bread(sb, tmp_bh.b_blocknr);
760 if (!bh)
761 return -EIO;
762 memcpy(data, bh->b_data+offset, tocopy);
763 brelse(bh);
764 }
765 offset = 0;
766 toread -= tocopy;
767 data += tocopy;
768 blk++;
769 }
770 return len;
771 }
772
773 /* Write to quotafile */
774 static ssize_t jfs_quota_write(struct super_block *sb, int type,
775 const char *data, size_t len, loff_t off)
776 {
777 struct inode *inode = sb_dqopt(sb)->files[type];
778 sector_t blk = off >> sb->s_blocksize_bits;
779 int err = 0;
780 int offset = off & (sb->s_blocksize - 1);
781 int tocopy;
782 size_t towrite = len;
783 struct buffer_head tmp_bh;
784 struct buffer_head *bh;
785
786 mutex_lock(&inode->i_mutex);
787 while (towrite > 0) {
788 tocopy = sb->s_blocksize - offset < towrite ?
789 sb->s_blocksize - offset : towrite;
790
791 tmp_bh.b_state = 0;
792 tmp_bh.b_size = 1 << inode->i_blkbits;
793 err = jfs_get_block(inode, blk, &tmp_bh, 1);
794 if (err)
795 goto out;
796 if (offset || tocopy != sb->s_blocksize)
797 bh = sb_bread(sb, tmp_bh.b_blocknr);
798 else
799 bh = sb_getblk(sb, tmp_bh.b_blocknr);
800 if (!bh) {
801 err = -EIO;
802 goto out;
803 }
804 lock_buffer(bh);
805 memcpy(bh->b_data+offset, data, tocopy);
806 flush_dcache_page(bh->b_page);
807 set_buffer_uptodate(bh);
808 mark_buffer_dirty(bh);
809 unlock_buffer(bh);
810 brelse(bh);
811 offset = 0;
812 towrite -= tocopy;
813 data += tocopy;
814 blk++;
815 }
816 out:
817 if (len == towrite) {
818 mutex_unlock(&inode->i_mutex);
819 return err;
820 }
821 if (inode->i_size < off+len-towrite)
822 i_size_write(inode, off+len-towrite);
823 inode->i_version++;
824 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
825 mark_inode_dirty(inode);
826 mutex_unlock(&inode->i_mutex);
827 return len - towrite;
828 }
829
830 #endif
831
832 static const struct super_operations jfs_super_operations = {
833 .alloc_inode = jfs_alloc_inode,
834 .destroy_inode = jfs_destroy_inode,
835 .dirty_inode = jfs_dirty_inode,
836 .write_inode = jfs_write_inode,
837 .evict_inode = jfs_evict_inode,
838 .put_super = jfs_put_super,
839 .sync_fs = jfs_sync_fs,
840 .freeze_fs = jfs_freeze,
841 .unfreeze_fs = jfs_unfreeze,
842 .statfs = jfs_statfs,
843 .remount_fs = jfs_remount,
844 .show_options = jfs_show_options,
845 #ifdef CONFIG_QUOTA
846 .quota_read = jfs_quota_read,
847 .quota_write = jfs_quota_write,
848 #endif
849 };
850
851 static const struct export_operations jfs_export_operations = {
852 .fh_to_dentry = jfs_fh_to_dentry,
853 .fh_to_parent = jfs_fh_to_parent,
854 .get_parent = jfs_get_parent,
855 };
856
857 static struct file_system_type jfs_fs_type = {
858 .owner = THIS_MODULE,
859 .name = "jfs",
860 .mount = jfs_do_mount,
861 .kill_sb = kill_block_super,
862 .fs_flags = FS_REQUIRES_DEV,
863 };
864 MODULE_ALIAS_FS("jfs");
865
866 static void init_once(void *foo)
867 {
868 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
869
870 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
871 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
872 init_rwsem(&jfs_ip->rdwrlock);
873 mutex_init(&jfs_ip->commit_mutex);
874 init_rwsem(&jfs_ip->xattr_sem);
875 spin_lock_init(&jfs_ip->ag_lock);
876 jfs_ip->active_ag = -1;
877 inode_init_once(&jfs_ip->vfs_inode);
878 }
879
880 static int __init init_jfs_fs(void)
881 {
882 int i;
883 int rc;
884
885 jfs_inode_cachep =
886 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
887 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
888 init_once);
889 if (jfs_inode_cachep == NULL)
890 return -ENOMEM;
891
892 /*
893 * Metapage initialization
894 */
895 rc = metapage_init();
896 if (rc) {
897 jfs_err("metapage_init failed w/rc = %d", rc);
898 goto free_slab;
899 }
900
901 /*
902 * Transaction Manager initialization
903 */
904 rc = txInit();
905 if (rc) {
906 jfs_err("txInit failed w/rc = %d", rc);
907 goto free_metapage;
908 }
909
910 /*
911 * I/O completion thread (endio)
912 */
913 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
914 if (IS_ERR(jfsIOthread)) {
915 rc = PTR_ERR(jfsIOthread);
916 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
917 goto end_txmngr;
918 }
919
920 if (commit_threads < 1)
921 commit_threads = num_online_cpus();
922 if (commit_threads > MAX_COMMIT_THREADS)
923 commit_threads = MAX_COMMIT_THREADS;
924
925 for (i = 0; i < commit_threads; i++) {
926 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
927 if (IS_ERR(jfsCommitThread[i])) {
928 rc = PTR_ERR(jfsCommitThread[i]);
929 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
930 commit_threads = i;
931 goto kill_committask;
932 }
933 }
934
935 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
936 if (IS_ERR(jfsSyncThread)) {
937 rc = PTR_ERR(jfsSyncThread);
938 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
939 goto kill_committask;
940 }
941
942 #ifdef PROC_FS_JFS
943 jfs_proc_init();
944 #endif
945
946 rc = register_filesystem(&jfs_fs_type);
947 if (!rc)
948 return 0;
949
950 #ifdef PROC_FS_JFS
951 jfs_proc_clean();
952 #endif
953 kthread_stop(jfsSyncThread);
954 kill_committask:
955 for (i = 0; i < commit_threads; i++)
956 kthread_stop(jfsCommitThread[i]);
957 kthread_stop(jfsIOthread);
958 end_txmngr:
959 txExit();
960 free_metapage:
961 metapage_exit();
962 free_slab:
963 kmem_cache_destroy(jfs_inode_cachep);
964 return rc;
965 }
966
967 static void __exit exit_jfs_fs(void)
968 {
969 int i;
970
971 jfs_info("exit_jfs_fs called");
972
973 txExit();
974 metapage_exit();
975
976 kthread_stop(jfsIOthread);
977 for (i = 0; i < commit_threads; i++)
978 kthread_stop(jfsCommitThread[i]);
979 kthread_stop(jfsSyncThread);
980 #ifdef PROC_FS_JFS
981 jfs_proc_clean();
982 #endif
983 unregister_filesystem(&jfs_fs_type);
984
985 /*
986 * Make sure all delayed rcu free inodes are flushed before we
987 * destroy cache.
988 */
989 rcu_barrier();
990 kmem_cache_destroy(jfs_inode_cachep);
991 }
992
993 module_init(init_jfs_fs)
994 module_exit(exit_jfs_fs)
Linux kernel - Deliverables
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