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f2fs: introduce cp_lock to protect updating of ckpt_flags
[linux-2.6/btrfs-unstable.git] / fs / jfs / super.c
blobcec8814a3b8becb58cc9b640c3867312e44c2d5a
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",
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): %ps: %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 #ifdef CONFIG_QUOTA
121 memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot));
122 #endif
123 return &jfs_inode->vfs_inode;
124 }
125
126 static void jfs_i_callback(struct rcu_head *head)
127 {
128 struct inode *inode = container_of(head, struct inode, i_rcu);
129 struct jfs_inode_info *ji = JFS_IP(inode);
130 kmem_cache_free(jfs_inode_cachep, ji);
131 }
132
133 static void jfs_destroy_inode(struct inode *inode)
134 {
135 struct jfs_inode_info *ji = JFS_IP(inode);
136
137 BUG_ON(!list_empty(&ji->anon_inode_list));
138
139 spin_lock_irq(&ji->ag_lock);
140 if (ji->active_ag != -1) {
141 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
142 atomic_dec(&bmap->db_active[ji->active_ag]);
143 ji->active_ag = -1;
144 }
145 spin_unlock_irq(&ji->ag_lock);
146 call_rcu(&inode->i_rcu, jfs_i_callback);
147 }
148
149 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
150 {
151 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
152 s64 maxinodes;
153 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
154
155 jfs_info("In jfs_statfs");
156 buf->f_type = JFS_SUPER_MAGIC;
157 buf->f_bsize = sbi->bsize;
158 buf->f_blocks = sbi->bmap->db_mapsize;
159 buf->f_bfree = sbi->bmap->db_nfree;
160 buf->f_bavail = sbi->bmap->db_nfree;
161 /*
162 * If we really return the number of allocated & free inodes, some
163 * applications will fail because they won't see enough free inodes.
164 * We'll try to calculate some guess as to how many inodes we can
165 * really allocate
166 *
167 * buf->f_files = atomic_read(&imap->im_numinos);
168 * buf->f_ffree = atomic_read(&imap->im_numfree);
169 */
170 maxinodes = min((s64) atomic_read(&imap->im_numinos) +
171 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
172 << L2INOSPEREXT), (s64) 0xffffffffLL);
173 buf->f_files = maxinodes;
174 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
175 atomic_read(&imap->im_numfree));
176 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
177 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
178 sizeof(sbi->uuid)/2);
179
180 buf->f_namelen = JFS_NAME_MAX;
181 return 0;
182 }
183
184 static void jfs_put_super(struct super_block *sb)
185 {
186 struct jfs_sb_info *sbi = JFS_SBI(sb);
187 int rc;
188
189 jfs_info("In jfs_put_super");
190
191 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
192
193 rc = jfs_umount(sb);
194 if (rc)
195 jfs_err("jfs_umount failed with return code %d", rc);
196
197 unload_nls(sbi->nls_tab);
198
199 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
200 iput(sbi->direct_inode);
201
202 kfree(sbi);
203 }
204
205 enum {
206 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
207 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
208 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask,
209 Opt_discard, Opt_nodiscard, Opt_discard_minblk
210 };
211
212 static const match_table_t tokens = {
213 {Opt_integrity, "integrity"},
214 {Opt_nointegrity, "nointegrity"},
215 {Opt_iocharset, "iocharset=%s"},
216 {Opt_resize, "resize=%u"},
217 {Opt_resize_nosize, "resize"},
218 {Opt_errors, "errors=%s"},
219 {Opt_ignore, "noquota"},
220 {Opt_ignore, "quota"},
221 {Opt_usrquota, "usrquota"},
222 {Opt_grpquota, "grpquota"},
223 {Opt_uid, "uid=%u"},
224 {Opt_gid, "gid=%u"},
225 {Opt_umask, "umask=%u"},
226 {Opt_discard, "discard"},
227 {Opt_nodiscard, "nodiscard"},
228 {Opt_discard_minblk, "discard=%u"},
229 {Opt_err, NULL}
230 };
231
232 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
233 int *flag)
234 {
235 void *nls_map = (void *)-1; /* -1: no change; NULL: none */
236 char *p;
237 struct jfs_sb_info *sbi = JFS_SBI(sb);
238
239 *newLVSize = 0;
240
241 if (!options)
242 return 1;
243
244 while ((p = strsep(&options, ",")) != NULL) {
245 substring_t args[MAX_OPT_ARGS];
246 int token;
247 if (!*p)
248 continue;
249
250 token = match_token(p, tokens, args);
251 switch (token) {
252 case Opt_integrity:
253 *flag &= ~JFS_NOINTEGRITY;
254 break;
255 case Opt_nointegrity:
256 *flag |= JFS_NOINTEGRITY;
257 break;
258 case Opt_ignore:
259 /* Silently ignore the quota options */
260 /* Don't do anything ;-) */
261 break;
262 case Opt_iocharset:
263 if (nls_map && nls_map != (void *) -1)
264 unload_nls(nls_map);
265 if (!strcmp(args[0].from, "none"))
266 nls_map = NULL;
267 else {
268 nls_map = load_nls(args[0].from);
269 if (!nls_map) {
270 pr_err("JFS: charset not found\n");
271 goto cleanup;
272 }
273 }
274 break;
275 case Opt_resize:
276 {
277 char *resize = args[0].from;
278 int rc = kstrtoll(resize, 0, newLVSize);
279
280 if (rc)
281 goto cleanup;
282 break;
283 }
284 case Opt_resize_nosize:
285 {
286 *newLVSize = sb->s_bdev->bd_inode->i_size >>
287 sb->s_blocksize_bits;
288 if (*newLVSize == 0)
289 pr_err("JFS: Cannot determine volume size\n");
290 break;
291 }
292 case Opt_errors:
293 {
294 char *errors = args[0].from;
295 if (!errors || !*errors)
296 goto cleanup;
297 if (!strcmp(errors, "continue")) {
298 *flag &= ~JFS_ERR_REMOUNT_RO;
299 *flag &= ~JFS_ERR_PANIC;
300 *flag |= JFS_ERR_CONTINUE;
301 } else if (!strcmp(errors, "remount-ro")) {
302 *flag &= ~JFS_ERR_CONTINUE;
303 *flag &= ~JFS_ERR_PANIC;
304 *flag |= JFS_ERR_REMOUNT_RO;
305 } else if (!strcmp(errors, "panic")) {
306 *flag &= ~JFS_ERR_CONTINUE;
307 *flag &= ~JFS_ERR_REMOUNT_RO;
308 *flag |= JFS_ERR_PANIC;
309 } else {
310 pr_err("JFS: %s is an invalid error handler\n",
311 errors);
312 goto cleanup;
313 }
314 break;
315 }
316
317 #ifdef CONFIG_QUOTA
318 case Opt_quota:
319 case Opt_usrquota:
320 *flag |= JFS_USRQUOTA;
321 break;
322 case Opt_grpquota:
323 *flag |= JFS_GRPQUOTA;
324 break;
325 #else
326 case Opt_usrquota:
327 case Opt_grpquota:
328 case Opt_quota:
329 pr_err("JFS: quota operations not supported\n");
330 break;
331 #endif
332 case Opt_uid:
333 {
334 char *uid = args[0].from;
335 uid_t val;
336 int rc = kstrtouint(uid, 0, &val);
337
338 if (rc)
339 goto cleanup;
340 sbi->uid = make_kuid(current_user_ns(), val);
341 if (!uid_valid(sbi->uid))
342 goto cleanup;
343 break;
344 }
345
346 case Opt_gid:
347 {
348 char *gid = args[0].from;
349 gid_t val;
350 int rc = kstrtouint(gid, 0, &val);
351
352 if (rc)
353 goto cleanup;
354 sbi->gid = make_kgid(current_user_ns(), val);
355 if (!gid_valid(sbi->gid))
356 goto cleanup;
357 break;
358 }
359
360 case Opt_umask:
361 {
362 char *umask = args[0].from;
363 int rc = kstrtouint(umask, 8, &sbi->umask);
364
365 if (rc)
366 goto cleanup;
367 if (sbi->umask & ~0777) {
368 pr_err("JFS: Invalid value of umask\n");
369 goto cleanup;
370 }
371 break;
372 }
373
374 case Opt_discard:
375 {
376 struct request_queue *q = bdev_get_queue(sb->s_bdev);
377 /* if set to 1, even copying files will cause
378 * trimming :O
379 * -> user has more control over the online trimming
380 */
381 sbi->minblks_trim = 64;
382 if (blk_queue_discard(q))
383 *flag |= JFS_DISCARD;
384 else
385 pr_err("JFS: discard option not supported on device\n");
386 break;
387 }
388
389 case Opt_nodiscard:
390 *flag &= ~JFS_DISCARD;
391 break;
392
393 case Opt_discard_minblk:
394 {
395 struct request_queue *q = bdev_get_queue(sb->s_bdev);
396 char *minblks_trim = args[0].from;
397 int rc;
398 if (blk_queue_discard(q)) {
399 *flag |= JFS_DISCARD;
400 rc = kstrtouint(minblks_trim, 0,
401 &sbi->minblks_trim);
402 if (rc)
403 goto cleanup;
404 } else
405 pr_err("JFS: discard option not supported on device\n");
406 break;
407 }
408
409 default:
410 printk("jfs: Unrecognized mount option \"%s\" or missing value\n",
411 p);
412 goto cleanup;
413 }
414 }
415
416 if (nls_map != (void *) -1) {
417 /* Discard old (if remount) */
418 unload_nls(sbi->nls_tab);
419 sbi->nls_tab = nls_map;
420 }
421 return 1;
422
423 cleanup:
424 if (nls_map && nls_map != (void *) -1)
425 unload_nls(nls_map);
426 return 0;
427 }
428
429 static int jfs_remount(struct super_block *sb, int *flags, char *data)
430 {
431 s64 newLVSize = 0;
432 int rc = 0;
433 int flag = JFS_SBI(sb)->flag;
434 int ret;
435
436 sync_filesystem(sb);
437 if (!parse_options(data, sb, &newLVSize, &flag))
438 return -EINVAL;
439
440 if (newLVSize) {
441 if (sb->s_flags & MS_RDONLY) {
442 pr_err("JFS: resize requires volume to be mounted read-write\n");
443 return -EROFS;
444 }
445 rc = jfs_extendfs(sb, newLVSize, 0);
446 if (rc)
447 return rc;
448 }
449
450 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
451 /*
452 * Invalidate any previously read metadata. fsck may have
453 * changed the on-disk data since we mounted r/o
454 */
455 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
456
457 JFS_SBI(sb)->flag = flag;
458 ret = jfs_mount_rw(sb, 1);
459
460 /* mark the fs r/w for quota activity */
461 sb->s_flags &= ~MS_RDONLY;
462
463 dquot_resume(sb, -1);
464 return ret;
465 }
466 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
467 rc = dquot_suspend(sb, -1);
468 if (rc < 0)
469 return rc;
470 rc = jfs_umount_rw(sb);
471 JFS_SBI(sb)->flag = flag;
472 return rc;
473 }
474 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
475 if (!(sb->s_flags & MS_RDONLY)) {
476 rc = jfs_umount_rw(sb);
477 if (rc)
478 return rc;
479
480 JFS_SBI(sb)->flag = flag;
481 ret = jfs_mount_rw(sb, 1);
482 return ret;
483 }
484 JFS_SBI(sb)->flag = flag;
485
486 return 0;
487 }
488
489 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
490 {
491 struct jfs_sb_info *sbi;
492 struct inode *inode;
493 int rc;
494 s64 newLVSize = 0;
495 int flag, ret = -EINVAL;
496
497 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
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 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
541 #endif
542
543 /*
544 * Initialize direct-mapping inode/address-space
545 */
546 inode = new_inode(sb);
547 if (inode == NULL) {
548 ret = -ENOMEM;
549 goto out_unload;
550 }
551 inode->i_ino = 0;
552 inode->i_size = sb->s_bdev->bd_inode->i_size;
553 inode->i_mapping->a_ops = &jfs_metapage_aops;
554 hlist_add_fake(&inode->i_hash);
555 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
556
557 sbi->direct_inode = inode;
558
559 rc = jfs_mount(sb);
560 if (rc) {
561 if (!silent)
562 jfs_err("jfs_mount failed w/return code = %d", rc);
563 goto out_mount_failed;
564 }
565 if (sb->s_flags & MS_RDONLY)
566 sbi->log = NULL;
567 else {
568 rc = jfs_mount_rw(sb, 0);
569 if (rc) {
570 if (!silent) {
571 jfs_err("jfs_mount_rw failed, return code = %d",
572 rc);
573 }
574 goto out_no_rw;
575 }
576 }
577
578 sb->s_magic = JFS_SUPER_MAGIC;
579
580 if (sbi->mntflag & JFS_OS2)
581 sb->s_d_op = &jfs_ci_dentry_operations;
582
583 inode = jfs_iget(sb, ROOT_I);
584 if (IS_ERR(inode)) {
585 ret = PTR_ERR(inode);
586 goto out_no_rw;
587 }
588 sb->s_root = d_make_root(inode);
589 if (!sb->s_root)
590 goto out_no_root;
591
592 /* logical blocks are represented by 40 bits in pxd_t, etc. */
593 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
594 #if BITS_PER_LONG == 32
595 /*
596 * Page cache is indexed by long.
597 * I would use MAX_LFS_FILESIZE, but it's only half as big
598 */
599 sb->s_maxbytes = min(((u64) PAGE_SIZE << 32) - 1,
600 (u64)sb->s_maxbytes);
601 #endif
602 sb->s_time_gran = 1;
603 return 0;
604
605 out_no_root:
606 jfs_err("jfs_read_super: get root dentry failed");
607
608 out_no_rw:
609 rc = jfs_umount(sb);
610 if (rc)
611 jfs_err("jfs_umount failed with return code %d", rc);
612 out_mount_failed:
613 filemap_write_and_wait(sbi->direct_inode->i_mapping);
614 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
615 make_bad_inode(sbi->direct_inode);
616 iput(sbi->direct_inode);
617 sbi->direct_inode = NULL;
618 out_unload:
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");
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 inode_lock(inode);
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 inode_unlock(inode);
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 inode_unlock(inode);
836 return len - towrite;
837 }
838
839 static struct dquot **jfs_get_dquots(struct inode *inode)
840 {
841 return JFS_IP(inode)->i_dquot;
842 }
843 #endif
844
845 static const struct super_operations jfs_super_operations = {
846 .alloc_inode = jfs_alloc_inode,
847 .destroy_inode = jfs_destroy_inode,
848 .dirty_inode = jfs_dirty_inode,
849 .write_inode = jfs_write_inode,
850 .evict_inode = jfs_evict_inode,
851 .put_super = jfs_put_super,
852 .sync_fs = jfs_sync_fs,
853 .freeze_fs = jfs_freeze,
854 .unfreeze_fs = jfs_unfreeze,
855 .statfs = jfs_statfs,
856 .remount_fs = jfs_remount,
857 .show_options = jfs_show_options,
858 #ifdef CONFIG_QUOTA
859 .quota_read = jfs_quota_read,
860 .quota_write = jfs_quota_write,
861 .get_dquots = jfs_get_dquots,
862 #endif
863 };
864
865 static const struct export_operations jfs_export_operations = {
866 .fh_to_dentry = jfs_fh_to_dentry,
867 .fh_to_parent = jfs_fh_to_parent,
868 .get_parent = jfs_get_parent,
869 };
870
871 static struct file_system_type jfs_fs_type = {
872 .owner = THIS_MODULE,
873 .name = "jfs",
874 .mount = jfs_do_mount,
875 .kill_sb = kill_block_super,
876 .fs_flags = FS_REQUIRES_DEV,
877 };
878 MODULE_ALIAS_FS("jfs");
879
880 static void init_once(void *foo)
881 {
882 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
883
884 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
885 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
886 init_rwsem(&jfs_ip->rdwrlock);
887 mutex_init(&jfs_ip->commit_mutex);
888 init_rwsem(&jfs_ip->xattr_sem);
889 spin_lock_init(&jfs_ip->ag_lock);
890 jfs_ip->active_ag = -1;
891 inode_init_once(&jfs_ip->vfs_inode);
892 }
893
894 static int __init init_jfs_fs(void)
895 {
896 int i;
897 int rc;
898
899 jfs_inode_cachep =
900 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
901 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
902 init_once);
903 if (jfs_inode_cachep == NULL)
904 return -ENOMEM;
905
906 /*
907 * Metapage initialization
908 */
909 rc = metapage_init();
910 if (rc) {
911 jfs_err("metapage_init failed w/rc = %d", rc);
912 goto free_slab;
913 }
914
915 /*
916 * Transaction Manager initialization
917 */
918 rc = txInit();
919 if (rc) {
920 jfs_err("txInit failed w/rc = %d", rc);
921 goto free_metapage;
922 }
923
924 /*
925 * I/O completion thread (endio)
926 */
927 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
928 if (IS_ERR(jfsIOthread)) {
929 rc = PTR_ERR(jfsIOthread);
930 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
931 goto end_txmngr;
932 }
933
934 if (commit_threads < 1)
935 commit_threads = num_online_cpus();
936 if (commit_threads > MAX_COMMIT_THREADS)
937 commit_threads = MAX_COMMIT_THREADS;
938
939 for (i = 0; i < commit_threads; i++) {
940 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
941 "jfsCommit");
942 if (IS_ERR(jfsCommitThread[i])) {
943 rc = PTR_ERR(jfsCommitThread[i]);
944 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
945 commit_threads = i;
946 goto kill_committask;
947 }
948 }
949
950 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
951 if (IS_ERR(jfsSyncThread)) {
952 rc = PTR_ERR(jfsSyncThread);
953 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
954 goto kill_committask;
955 }
956
957 #ifdef PROC_FS_JFS
958 jfs_proc_init();
959 #endif
960
961 rc = register_filesystem(&jfs_fs_type);
962 if (!rc)
963 return 0;
964
965 #ifdef PROC_FS_JFS
966 jfs_proc_clean();
967 #endif
968 kthread_stop(jfsSyncThread);
969 kill_committask:
970 for (i = 0; i < commit_threads; i++)
971 kthread_stop(jfsCommitThread[i]);
972 kthread_stop(jfsIOthread);
973 end_txmngr:
974 txExit();
975 free_metapage:
976 metapage_exit();
977 free_slab:
978 kmem_cache_destroy(jfs_inode_cachep);
979 return rc;
980 }
981
982 static void __exit exit_jfs_fs(void)
983 {
984 int i;
985
986 jfs_info("exit_jfs_fs called");
987
988 txExit();
989 metapage_exit();
990
991 kthread_stop(jfsIOthread);
992 for (i = 0; i < commit_threads; i++)
993 kthread_stop(jfsCommitThread[i]);
994 kthread_stop(jfsSyncThread);
995 #ifdef PROC_FS_JFS
996 jfs_proc_clean();
997 #endif
998 unregister_filesystem(&jfs_fs_type);
999
1000 /*
1001 * Make sure all delayed rcu free inodes are flushed before we
1002 * destroy cache.
1003 */
1004 rcu_barrier();
1005 kmem_cache_destroy(jfs_inode_cachep);
1006 }
1007
1008 module_init(init_jfs_fs)
1009 module_exit(exit_jfs_fs)
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