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MIPS: Kconfig: Add missing MODULES dependency to VPE_LOADER
[linux-2.6.git] / fs / jfs / super.c
blob788e0a9c1fb09cfb6d80ee65e1747310c7c840d0
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
48 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
49 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
50 MODULE_LICENSE("GPL");
51
52 static struct kmem_cache * jfs_inode_cachep;
53
54 static const struct super_operations jfs_super_operations;
55 static const struct export_operations jfs_export_operations;
56 static struct file_system_type jfs_fs_type;
57
58 #define MAX_COMMIT_THREADS 64
59 static int commit_threads = 0;
60 module_param(commit_threads, int, 0);
61 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
62
63 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
64 struct task_struct *jfsIOthread;
65 struct task_struct *jfsSyncThread;
66
67 #ifdef CONFIG_JFS_DEBUG
68 int jfsloglevel = JFS_LOGLEVEL_WARN;
69 module_param(jfsloglevel, int, 0644);
70 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
71 #endif
72
73 static void jfs_handle_error(struct super_block *sb)
74 {
75 struct jfs_sb_info *sbi = JFS_SBI(sb);
76
77 if (sb->s_flags & MS_RDONLY)
78 return;
79
80 updateSuper(sb, FM_DIRTY);
81
82 if (sbi->flag & JFS_ERR_PANIC)
83 panic("JFS (device %s): panic forced after error\n",
84 sb->s_id);
85 else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
86 jfs_err("ERROR: (device %s): remounting filesystem "
87 "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 * function, ...)
96 {
97 static char error_buf[256];
98 va_list args;
99
100 va_start(args, function);
101 vsnprintf(error_buf, sizeof(error_buf), function, args);
102 va_end(args);
103
104 pr_err("ERROR: (device %s): %s\n", sb->s_id, error_buf);
105
106 jfs_handle_error(sb);
107 }
108
109 static struct inode *jfs_alloc_inode(struct super_block *sb)
110 {
111 struct jfs_inode_info *jfs_inode;
112
113 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
114 if (!jfs_inode)
115 return NULL;
116 return &jfs_inode->vfs_inode;
117 }
118
119 static void jfs_i_callback(struct rcu_head *head)
120 {
121 struct inode *inode = container_of(head, struct inode, i_rcu);
122 struct jfs_inode_info *ji = JFS_IP(inode);
123 kmem_cache_free(jfs_inode_cachep, ji);
124 }
125
126 static void jfs_destroy_inode(struct inode *inode)
127 {
128 struct jfs_inode_info *ji = JFS_IP(inode);
129
130 BUG_ON(!list_empty(&ji->anon_inode_list));
131
132 spin_lock_irq(&ji->ag_lock);
133 if (ji->active_ag != -1) {
134 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
135 atomic_dec(&bmap->db_active[ji->active_ag]);
136 ji->active_ag = -1;
137 }
138 spin_unlock_irq(&ji->ag_lock);
139 call_rcu(&inode->i_rcu, jfs_i_callback);
140 }
141
142 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
143 {
144 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
145 s64 maxinodes;
146 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
147
148 jfs_info("In jfs_statfs");
149 buf->f_type = JFS_SUPER_MAGIC;
150 buf->f_bsize = sbi->bsize;
151 buf->f_blocks = sbi->bmap->db_mapsize;
152 buf->f_bfree = sbi->bmap->db_nfree;
153 buf->f_bavail = sbi->bmap->db_nfree;
154 /*
155 * If we really return the number of allocated & free inodes, some
156 * applications will fail because they won't see enough free inodes.
157 * We'll try to calculate some guess as to how many inodes we can
158 * really allocate
159 *
160 * buf->f_files = atomic_read(&imap->im_numinos);
161 * buf->f_ffree = atomic_read(&imap->im_numfree);
162 */
163 maxinodes = min((s64) atomic_read(&imap->im_numinos) +
164 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
165 << L2INOSPEREXT), (s64) 0xffffffffLL);
166 buf->f_files = maxinodes;
167 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
168 atomic_read(&imap->im_numfree));
169 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
170 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
171 sizeof(sbi->uuid)/2);
172
173 buf->f_namelen = JFS_NAME_MAX;
174 return 0;
175 }
176
177 static void jfs_put_super(struct super_block *sb)
178 {
179 struct jfs_sb_info *sbi = JFS_SBI(sb);
180 int rc;
181
182 jfs_info("In jfs_put_super");
183
184 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
185
186 rc = jfs_umount(sb);
187 if (rc)
188 jfs_err("jfs_umount failed with return code %d", rc);
189
190 unload_nls(sbi->nls_tab);
191
192 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
193 iput(sbi->direct_inode);
194
195 kfree(sbi);
196 }
197
198 enum {
199 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
200 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
201 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask,
202 Opt_discard, Opt_nodiscard, Opt_discard_minblk
203 };
204
205 static const match_table_t tokens = {
206 {Opt_integrity, "integrity"},
207 {Opt_nointegrity, "nointegrity"},
208 {Opt_iocharset, "iocharset=%s"},
209 {Opt_resize, "resize=%u"},
210 {Opt_resize_nosize, "resize"},
211 {Opt_errors, "errors=%s"},
212 {Opt_ignore, "noquota"},
213 {Opt_ignore, "quota"},
214 {Opt_usrquota, "usrquota"},
215 {Opt_grpquota, "grpquota"},
216 {Opt_uid, "uid=%u"},
217 {Opt_gid, "gid=%u"},
218 {Opt_umask, "umask=%u"},
219 {Opt_discard, "discard"},
220 {Opt_nodiscard, "nodiscard"},
221 {Opt_discard_minblk, "discard=%u"},
222 {Opt_err, NULL}
223 };
224
225 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
226 int *flag)
227 {
228 void *nls_map = (void *)-1; /* -1: no change; NULL: none */
229 char *p;
230 struct jfs_sb_info *sbi = JFS_SBI(sb);
231
232 *newLVSize = 0;
233
234 if (!options)
235 return 1;
236
237 while ((p = strsep(&options, ",")) != NULL) {
238 substring_t args[MAX_OPT_ARGS];
239 int token;
240 if (!*p)
241 continue;
242
243 token = match_token(p, tokens, args);
244 switch (token) {
245 case Opt_integrity:
246 *flag &= ~JFS_NOINTEGRITY;
247 break;
248 case Opt_nointegrity:
249 *flag |= JFS_NOINTEGRITY;
250 break;
251 case Opt_ignore:
252 /* Silently ignore the quota options */
253 /* Don't do anything ;-) */
254 break;
255 case Opt_iocharset:
256 if (nls_map && nls_map != (void *) -1)
257 unload_nls(nls_map);
258 if (!strcmp(args[0].from, "none"))
259 nls_map = NULL;
260 else {
261 nls_map = load_nls(args[0].from);
262 if (!nls_map) {
263 pr_err("JFS: charset not found\n");
264 goto cleanup;
265 }
266 }
267 break;
268 case Opt_resize:
269 {
270 char *resize = args[0].from;
271 *newLVSize = simple_strtoull(resize, &resize, 0);
272 break;
273 }
274 case Opt_resize_nosize:
275 {
276 *newLVSize = sb->s_bdev->bd_inode->i_size >>
277 sb->s_blocksize_bits;
278 if (*newLVSize == 0)
279 pr_err("JFS: Cannot determine volume size\n");
280 break;
281 }
282 case Opt_errors:
283 {
284 char *errors = args[0].from;
285 if (!errors || !*errors)
286 goto cleanup;
287 if (!strcmp(errors, "continue")) {
288 *flag &= ~JFS_ERR_REMOUNT_RO;
289 *flag &= ~JFS_ERR_PANIC;
290 *flag |= JFS_ERR_CONTINUE;
291 } else if (!strcmp(errors, "remount-ro")) {
292 *flag &= ~JFS_ERR_CONTINUE;
293 *flag &= ~JFS_ERR_PANIC;
294 *flag |= JFS_ERR_REMOUNT_RO;
295 } else if (!strcmp(errors, "panic")) {
296 *flag &= ~JFS_ERR_CONTINUE;
297 *flag &= ~JFS_ERR_REMOUNT_RO;
298 *flag |= JFS_ERR_PANIC;
299 } else {
300 pr_err("JFS: %s is an invalid error handler\n",
301 errors);
302 goto cleanup;
303 }
304 break;
305 }
306
307 #ifdef CONFIG_QUOTA
308 case Opt_quota:
309 case Opt_usrquota:
310 *flag |= JFS_USRQUOTA;
311 break;
312 case Opt_grpquota:
313 *flag |= JFS_GRPQUOTA;
314 break;
315 #else
316 case Opt_usrquota:
317 case Opt_grpquota:
318 case Opt_quota:
319 pr_err("JFS: quota operations not supported\n");
320 break;
321 #endif
322 case Opt_uid:
323 {
324 char *uid = args[0].from;
325 uid_t val = simple_strtoul(uid, &uid, 0);
326 sbi->uid = make_kuid(current_user_ns(), val);
327 if (!uid_valid(sbi->uid))
328 goto cleanup;
329 break;
330 }
331
332 case Opt_gid:
333 {
334 char *gid = args[0].from;
335 gid_t val = simple_strtoul(gid, &gid, 0);
336 sbi->gid = make_kgid(current_user_ns(), val);
337 if (!gid_valid(sbi->gid))
338 goto cleanup;
339 break;
340 }
341
342 case Opt_umask:
343 {
344 char *umask = args[0].from;
345 sbi->umask = simple_strtoul(umask, &umask, 8);
346 if (sbi->umask & ~0777) {
347 pr_err("JFS: Invalid value of umask\n");
348 goto cleanup;
349 }
350 break;
351 }
352
353 case Opt_discard:
354 {
355 struct request_queue *q = bdev_get_queue(sb->s_bdev);
356 /* if set to 1, even copying files will cause
357 * trimming :O
358 * -> user has more control over the online trimming
359 */
360 sbi->minblks_trim = 64;
361 if (blk_queue_discard(q)) {
362 *flag |= JFS_DISCARD;
363 } else {
364 pr_err("JFS: discard option " \
365 "not supported on device\n");
366 }
367 break;
368 }
369
370 case Opt_nodiscard:
371 *flag &= ~JFS_DISCARD;
372 break;
373
374 case Opt_discard_minblk:
375 {
376 struct request_queue *q = bdev_get_queue(sb->s_bdev);
377 char *minblks_trim = args[0].from;
378 if (blk_queue_discard(q)) {
379 *flag |= JFS_DISCARD;
380 sbi->minblks_trim = simple_strtoull(
381 minblks_trim, &minblks_trim, 0);
382 } else {
383 pr_err("JFS: discard option " \
384 "not supported on device\n");
385 }
386 break;
387 }
388
389 default:
390 printk("jfs: Unrecognized mount option \"%s\" "
391 " or missing value\n", p);
392 goto cleanup;
393 }
394 }
395
396 if (nls_map != (void *) -1) {
397 /* Discard old (if remount) */
398 unload_nls(sbi->nls_tab);
399 sbi->nls_tab = nls_map;
400 }
401 return 1;
402
403 cleanup:
404 if (nls_map && nls_map != (void *) -1)
405 unload_nls(nls_map);
406 return 0;
407 }
408
409 static int jfs_remount(struct super_block *sb, int *flags, char *data)
410 {
411 s64 newLVSize = 0;
412 int rc = 0;
413 int flag = JFS_SBI(sb)->flag;
414 int ret;
415
416 if (!parse_options(data, sb, &newLVSize, &flag)) {
417 return -EINVAL;
418 }
419
420 if (newLVSize) {
421 if (sb->s_flags & MS_RDONLY) {
422 pr_err("JFS: resize requires volume" \
423 " to be mounted read-write\n");
424 return -EROFS;
425 }
426 rc = jfs_extendfs(sb, newLVSize, 0);
427 if (rc)
428 return rc;
429 }
430
431 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
432 /*
433 * Invalidate any previously read metadata. fsck may have
434 * changed the on-disk data since we mounted r/o
435 */
436 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
437
438 JFS_SBI(sb)->flag = flag;
439 ret = jfs_mount_rw(sb, 1);
440
441 /* mark the fs r/w for quota activity */
442 sb->s_flags &= ~MS_RDONLY;
443
444 dquot_resume(sb, -1);
445 return ret;
446 }
447 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
448 rc = dquot_suspend(sb, -1);
449 if (rc < 0) {
450 return rc;
451 }
452 rc = jfs_umount_rw(sb);
453 JFS_SBI(sb)->flag = flag;
454 return rc;
455 }
456 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
457 if (!(sb->s_flags & MS_RDONLY)) {
458 rc = jfs_umount_rw(sb);
459 if (rc)
460 return rc;
461
462 JFS_SBI(sb)->flag = flag;
463 ret = jfs_mount_rw(sb, 1);
464 return ret;
465 }
466 JFS_SBI(sb)->flag = flag;
467
468 return 0;
469 }
470
471 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
472 {
473 struct jfs_sb_info *sbi;
474 struct inode *inode;
475 int rc;
476 s64 newLVSize = 0;
477 int flag, ret = -EINVAL;
478
479 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
480
481 if (!new_valid_dev(sb->s_bdev->bd_dev))
482 return -EOVERFLOW;
483
484 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
485 if (!sbi)
486 return -ENOMEM;
487
488 sb->s_fs_info = sbi;
489 sb->s_max_links = JFS_LINK_MAX;
490 sbi->sb = sb;
491 sbi->uid = INVALID_UID;
492 sbi->gid = INVALID_GID;
493 sbi->umask = -1;
494
495 /* initialize the mount flag and determine the default error handler */
496 flag = JFS_ERR_REMOUNT_RO;
497
498 if (!parse_options((char *) data, sb, &newLVSize, &flag))
499 goto out_kfree;
500 sbi->flag = flag;
501
502 #ifdef CONFIG_JFS_POSIX_ACL
503 sb->s_flags |= MS_POSIXACL;
504 #endif
505
506 if (newLVSize) {
507 pr_err("resize option for remount only\n");
508 goto out_kfree;
509 }
510
511 /*
512 * Initialize blocksize to 4K.
513 */
514 sb_set_blocksize(sb, PSIZE);
515
516 /*
517 * Set method vectors.
518 */
519 sb->s_op = &jfs_super_operations;
520 sb->s_export_op = &jfs_export_operations;
521 #ifdef CONFIG_QUOTA
522 sb->dq_op = &dquot_operations;
523 sb->s_qcop = &dquot_quotactl_ops;
524 #endif
525
526 /*
527 * Initialize direct-mapping inode/address-space
528 */
529 inode = new_inode(sb);
530 if (inode == NULL) {
531 ret = -ENOMEM;
532 goto out_unload;
533 }
534 inode->i_ino = 0;
535 inode->i_size = sb->s_bdev->bd_inode->i_size;
536 inode->i_mapping->a_ops = &jfs_metapage_aops;
537 insert_inode_hash(inode);
538 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
539
540 sbi->direct_inode = inode;
541
542 rc = jfs_mount(sb);
543 if (rc) {
544 if (!silent) {
545 jfs_err("jfs_mount failed w/return code = %d", rc);
546 }
547 goto out_mount_failed;
548 }
549 if (sb->s_flags & MS_RDONLY)
550 sbi->log = NULL;
551 else {
552 rc = jfs_mount_rw(sb, 0);
553 if (rc) {
554 if (!silent) {
555 jfs_err("jfs_mount_rw failed, return code = %d",
556 rc);
557 }
558 goto out_no_rw;
559 }
560 }
561
562 sb->s_magic = JFS_SUPER_MAGIC;
563
564 if (sbi->mntflag & JFS_OS2)
565 sb->s_d_op = &jfs_ci_dentry_operations;
566
567 inode = jfs_iget(sb, ROOT_I);
568 if (IS_ERR(inode)) {
569 ret = PTR_ERR(inode);
570 goto out_no_rw;
571 }
572 sb->s_root = d_make_root(inode);
573 if (!sb->s_root)
574 goto out_no_root;
575
576 /* logical blocks are represented by 40 bits in pxd_t, etc. */
577 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
578 #if BITS_PER_LONG == 32
579 /*
580 * Page cache is indexed by long.
581 * I would use MAX_LFS_FILESIZE, but it's only half as big
582 */
583 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
584 #endif
585 sb->s_time_gran = 1;
586 return 0;
587
588 out_no_root:
589 jfs_err("jfs_read_super: get root dentry failed");
590
591 out_no_rw:
592 rc = jfs_umount(sb);
593 if (rc) {
594 jfs_err("jfs_umount failed with return code %d", rc);
595 }
596 out_mount_failed:
597 filemap_write_and_wait(sbi->direct_inode->i_mapping);
598 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
599 make_bad_inode(sbi->direct_inode);
600 iput(sbi->direct_inode);
601 sbi->direct_inode = NULL;
602 out_unload:
603 if (sbi->nls_tab)
604 unload_nls(sbi->nls_tab);
605 out_kfree:
606 kfree(sbi);
607 return ret;
608 }
609
610 static int jfs_freeze(struct super_block *sb)
611 {
612 struct jfs_sb_info *sbi = JFS_SBI(sb);
613 struct jfs_log *log = sbi->log;
614 int rc = 0;
615
616 if (!(sb->s_flags & MS_RDONLY)) {
617 txQuiesce(sb);
618 rc = lmLogShutdown(log);
619 if (rc) {
620 jfs_error(sb, "jfs_freeze: lmLogShutdown failed");
621
622 /* let operations fail rather than hang */
623 txResume(sb);
624
625 return rc;
626 }
627 rc = updateSuper(sb, FM_CLEAN);
628 if (rc) {
629 jfs_err("jfs_freeze: updateSuper failed\n");
630 /*
631 * Don't fail here. Everything succeeded except
632 * marking the superblock clean, so there's really
633 * no harm in leaving it frozen for now.
634 */
635 }
636 }
637 return 0;
638 }
639
640 static int jfs_unfreeze(struct super_block *sb)
641 {
642 struct jfs_sb_info *sbi = JFS_SBI(sb);
643 struct jfs_log *log = sbi->log;
644 int rc = 0;
645
646 if (!(sb->s_flags & MS_RDONLY)) {
647 rc = updateSuper(sb, FM_MOUNT);
648 if (rc) {
649 jfs_error(sb, "jfs_unfreeze: updateSuper failed");
650 goto out;
651 }
652 rc = lmLogInit(log);
653 if (rc)
654 jfs_error(sb, "jfs_unfreeze: lmLogInit failed");
655 out:
656 txResume(sb);
657 }
658 return rc;
659 }
660
661 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
662 int flags, const char *dev_name, void *data)
663 {
664 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
665 }
666
667 static int jfs_sync_fs(struct super_block *sb, int wait)
668 {
669 struct jfs_log *log = JFS_SBI(sb)->log;
670
671 /* log == NULL indicates read-only mount */
672 if (log) {
673 /*
674 * Write quota structures to quota file, sync_blockdev() will
675 * write them to disk later
676 */
677 dquot_writeback_dquots(sb, -1);
678 jfs_flush_journal(log, wait);
679 jfs_syncpt(log, 0);
680 }
681
682 return 0;
683 }
684
685 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
686 {
687 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
688
689 if (uid_valid(sbi->uid))
690 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
691 if (gid_valid(sbi->gid))
692 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
693 if (sbi->umask != -1)
694 seq_printf(seq, ",umask=%03o", sbi->umask);
695 if (sbi->flag & JFS_NOINTEGRITY)
696 seq_puts(seq, ",nointegrity");
697 if (sbi->flag & JFS_DISCARD)
698 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
699 if (sbi->nls_tab)
700 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
701 if (sbi->flag & JFS_ERR_CONTINUE)
702 seq_printf(seq, ",errors=continue");
703 if (sbi->flag & JFS_ERR_PANIC)
704 seq_printf(seq, ",errors=panic");
705
706 #ifdef CONFIG_QUOTA
707 if (sbi->flag & JFS_USRQUOTA)
708 seq_puts(seq, ",usrquota");
709
710 if (sbi->flag & JFS_GRPQUOTA)
711 seq_puts(seq, ",grpquota");
712 #endif
713
714 return 0;
715 }
716
717 #ifdef CONFIG_QUOTA
718
719 /* Read data from quotafile - avoid pagecache and such because we cannot afford
720 * acquiring the locks... As quota files are never truncated and quota code
721 * itself serializes the operations (and no one else should touch the files)
722 * we don't have to be afraid of races */
723 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
724 size_t len, loff_t off)
725 {
726 struct inode *inode = sb_dqopt(sb)->files[type];
727 sector_t blk = off >> sb->s_blocksize_bits;
728 int err = 0;
729 int offset = off & (sb->s_blocksize - 1);
730 int tocopy;
731 size_t toread;
732 struct buffer_head tmp_bh;
733 struct buffer_head *bh;
734 loff_t i_size = i_size_read(inode);
735
736 if (off > i_size)
737 return 0;
738 if (off+len > i_size)
739 len = i_size-off;
740 toread = len;
741 while (toread > 0) {
742 tocopy = sb->s_blocksize - offset < toread ?
743 sb->s_blocksize - offset : toread;
744
745 tmp_bh.b_state = 0;
746 tmp_bh.b_size = 1 << inode->i_blkbits;
747 err = jfs_get_block(inode, blk, &tmp_bh, 0);
748 if (err)
749 return err;
750 if (!buffer_mapped(&tmp_bh)) /* A hole? */
751 memset(data, 0, tocopy);
752 else {
753 bh = sb_bread(sb, tmp_bh.b_blocknr);
754 if (!bh)
755 return -EIO;
756 memcpy(data, bh->b_data+offset, tocopy);
757 brelse(bh);
758 }
759 offset = 0;
760 toread -= tocopy;
761 data += tocopy;
762 blk++;
763 }
764 return len;
765 }
766
767 /* Write to quotafile */
768 static ssize_t jfs_quota_write(struct super_block *sb, int type,
769 const char *data, size_t len, loff_t off)
770 {
771 struct inode *inode = sb_dqopt(sb)->files[type];
772 sector_t blk = off >> sb->s_blocksize_bits;
773 int err = 0;
774 int offset = off & (sb->s_blocksize - 1);
775 int tocopy;
776 size_t towrite = len;
777 struct buffer_head tmp_bh;
778 struct buffer_head *bh;
779
780 mutex_lock(&inode->i_mutex);
781 while (towrite > 0) {
782 tocopy = sb->s_blocksize - offset < towrite ?
783 sb->s_blocksize - offset : towrite;
784
785 tmp_bh.b_state = 0;
786 tmp_bh.b_size = 1 << inode->i_blkbits;
787 err = jfs_get_block(inode, blk, &tmp_bh, 1);
788 if (err)
789 goto out;
790 if (offset || tocopy != sb->s_blocksize)
791 bh = sb_bread(sb, tmp_bh.b_blocknr);
792 else
793 bh = sb_getblk(sb, tmp_bh.b_blocknr);
794 if (!bh) {
795 err = -EIO;
796 goto out;
797 }
798 lock_buffer(bh);
799 memcpy(bh->b_data+offset, data, tocopy);
800 flush_dcache_page(bh->b_page);
801 set_buffer_uptodate(bh);
802 mark_buffer_dirty(bh);
803 unlock_buffer(bh);
804 brelse(bh);
805 offset = 0;
806 towrite -= tocopy;
807 data += tocopy;
808 blk++;
809 }
810 out:
811 if (len == towrite) {
812 mutex_unlock(&inode->i_mutex);
813 return err;
814 }
815 if (inode->i_size < off+len-towrite)
816 i_size_write(inode, off+len-towrite);
817 inode->i_version++;
818 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
819 mark_inode_dirty(inode);
820 mutex_unlock(&inode->i_mutex);
821 return len - towrite;
822 }
823
824 #endif
825
826 static const struct super_operations jfs_super_operations = {
827 .alloc_inode = jfs_alloc_inode,
828 .destroy_inode = jfs_destroy_inode,
829 .dirty_inode = jfs_dirty_inode,
830 .write_inode = jfs_write_inode,
831 .evict_inode = jfs_evict_inode,
832 .put_super = jfs_put_super,
833 .sync_fs = jfs_sync_fs,
834 .freeze_fs = jfs_freeze,
835 .unfreeze_fs = jfs_unfreeze,
836 .statfs = jfs_statfs,
837 .remount_fs = jfs_remount,
838 .show_options = jfs_show_options,
839 #ifdef CONFIG_QUOTA
840 .quota_read = jfs_quota_read,
841 .quota_write = jfs_quota_write,
842 #endif
843 };
844
845 static const struct export_operations jfs_export_operations = {
846 .fh_to_dentry = jfs_fh_to_dentry,
847 .fh_to_parent = jfs_fh_to_parent,
848 .get_parent = jfs_get_parent,
849 };
850
851 static struct file_system_type jfs_fs_type = {
852 .owner = THIS_MODULE,
853 .name = "jfs",
854 .mount = jfs_do_mount,
855 .kill_sb = kill_block_super,
856 .fs_flags = FS_REQUIRES_DEV,
857 };
858 MODULE_ALIAS_FS("jfs");
859
860 static void init_once(void *foo)
861 {
862 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
863
864 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
865 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
866 init_rwsem(&jfs_ip->rdwrlock);
867 mutex_init(&jfs_ip->commit_mutex);
868 init_rwsem(&jfs_ip->xattr_sem);
869 spin_lock_init(&jfs_ip->ag_lock);
870 jfs_ip->active_ag = -1;
871 inode_init_once(&jfs_ip->vfs_inode);
872 }
873
874 static int __init init_jfs_fs(void)
875 {
876 int i;
877 int rc;
878
879 jfs_inode_cachep =
880 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
881 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
882 init_once);
883 if (jfs_inode_cachep == NULL)
884 return -ENOMEM;
885
886 /*
887 * Metapage initialization
888 */
889 rc = metapage_init();
890 if (rc) {
891 jfs_err("metapage_init failed w/rc = %d", rc);
892 goto free_slab;
893 }
894
895 /*
896 * Transaction Manager initialization
897 */
898 rc = txInit();
899 if (rc) {
900 jfs_err("txInit failed w/rc = %d", rc);
901 goto free_metapage;
902 }
903
904 /*
905 * I/O completion thread (endio)
906 */
907 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
908 if (IS_ERR(jfsIOthread)) {
909 rc = PTR_ERR(jfsIOthread);
910 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
911 goto end_txmngr;
912 }
913
914 if (commit_threads < 1)
915 commit_threads = num_online_cpus();
916 if (commit_threads > MAX_COMMIT_THREADS)
917 commit_threads = MAX_COMMIT_THREADS;
918
919 for (i = 0; i < commit_threads; i++) {
920 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
921 if (IS_ERR(jfsCommitThread[i])) {
922 rc = PTR_ERR(jfsCommitThread[i]);
923 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
924 commit_threads = i;
925 goto kill_committask;
926 }
927 }
928
929 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
930 if (IS_ERR(jfsSyncThread)) {
931 rc = PTR_ERR(jfsSyncThread);
932 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
933 goto kill_committask;
934 }
935
936 #ifdef PROC_FS_JFS
937 jfs_proc_init();
938 #endif
939
940 rc = register_filesystem(&jfs_fs_type);
941 if (!rc)
942 return 0;
943
944 #ifdef PROC_FS_JFS
945 jfs_proc_clean();
946 #endif
947 kthread_stop(jfsSyncThread);
948 kill_committask:
949 for (i = 0; i < commit_threads; i++)
950 kthread_stop(jfsCommitThread[i]);
951 kthread_stop(jfsIOthread);
952 end_txmngr:
953 txExit();
954 free_metapage:
955 metapage_exit();
956 free_slab:
957 kmem_cache_destroy(jfs_inode_cachep);
958 return rc;
959 }
960
961 static void __exit exit_jfs_fs(void)
962 {
963 int i;
964
965 jfs_info("exit_jfs_fs called");
966
967 txExit();
968 metapage_exit();
969
970 kthread_stop(jfsIOthread);
971 for (i = 0; i < commit_threads; i++)
972 kthread_stop(jfsCommitThread[i]);
973 kthread_stop(jfsSyncThread);
974 #ifdef PROC_FS_JFS
975 jfs_proc_clean();
976 #endif
977 unregister_filesystem(&jfs_fs_type);
978
979 /*
980 * Make sure all delayed rcu free inodes are flushed before we
981 * destroy cache.
982 */
983 rcu_barrier();
984 kmem_cache_destroy(jfs_inode_cachep);
985 }
986
987 module_init(init_jfs_fs)
988 module_exit(exit_jfs_fs)
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