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Linux 3.12.39
[linux/fpc-iii.git] / fs / jfs / super.c
blob6669aa2042c30154e0ad318ff5d6d657a2b60f61
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 *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 *newLVSize = simple_strtoull(resize, &resize, 0);
276 break;
277 }
278 case Opt_resize_nosize:
279 {
280 *newLVSize = sb->s_bdev->bd_inode->i_size >>
281 sb->s_blocksize_bits;
282 if (*newLVSize == 0)
283 pr_err("JFS: Cannot determine volume size\n");
284 break;
285 }
286 case Opt_errors:
287 {
288 char *errors = args[0].from;
289 if (!errors || !*errors)
290 goto cleanup;
291 if (!strcmp(errors, "continue")) {
292 *flag &= ~JFS_ERR_REMOUNT_RO;
293 *flag &= ~JFS_ERR_PANIC;
294 *flag |= JFS_ERR_CONTINUE;
295 } else if (!strcmp(errors, "remount-ro")) {
296 *flag &= ~JFS_ERR_CONTINUE;
297 *flag &= ~JFS_ERR_PANIC;
298 *flag |= JFS_ERR_REMOUNT_RO;
299 } else if (!strcmp(errors, "panic")) {
300 *flag &= ~JFS_ERR_CONTINUE;
301 *flag &= ~JFS_ERR_REMOUNT_RO;
302 *flag |= JFS_ERR_PANIC;
303 } else {
304 pr_err("JFS: %s is an invalid error handler\n",
305 errors);
306 goto cleanup;
307 }
308 break;
309 }
310
311 #ifdef CONFIG_QUOTA
312 case Opt_quota:
313 case Opt_usrquota:
314 *flag |= JFS_USRQUOTA;
315 break;
316 case Opt_grpquota:
317 *flag |= JFS_GRPQUOTA;
318 break;
319 #else
320 case Opt_usrquota:
321 case Opt_grpquota:
322 case Opt_quota:
323 pr_err("JFS: quota operations not supported\n");
324 break;
325 #endif
326 case Opt_uid:
327 {
328 char *uid = args[0].from;
329 uid_t val = simple_strtoul(uid, &uid, 0);
330 sbi->uid = make_kuid(current_user_ns(), val);
331 if (!uid_valid(sbi->uid))
332 goto cleanup;
333 break;
334 }
335
336 case Opt_gid:
337 {
338 char *gid = args[0].from;
339 gid_t val = simple_strtoul(gid, &gid, 0);
340 sbi->gid = make_kgid(current_user_ns(), val);
341 if (!gid_valid(sbi->gid))
342 goto cleanup;
343 break;
344 }
345
346 case Opt_umask:
347 {
348 char *umask = args[0].from;
349 sbi->umask = simple_strtoul(umask, &umask, 8);
350 if (sbi->umask & ~0777) {
351 pr_err("JFS: Invalid value of umask\n");
352 goto cleanup;
353 }
354 break;
355 }
356
357 case Opt_discard:
358 {
359 struct request_queue *q = bdev_get_queue(sb->s_bdev);
360 /* if set to 1, even copying files will cause
361 * trimming :O
362 * -> user has more control over the online trimming
363 */
364 sbi->minblks_trim = 64;
365 if (blk_queue_discard(q)) {
366 *flag |= JFS_DISCARD;
367 } else {
368 pr_err("JFS: discard option " \
369 "not supported on device\n");
370 }
371 break;
372 }
373
374 case Opt_nodiscard:
375 *flag &= ~JFS_DISCARD;
376 break;
377
378 case Opt_discard_minblk:
379 {
380 struct request_queue *q = bdev_get_queue(sb->s_bdev);
381 char *minblks_trim = args[0].from;
382 if (blk_queue_discard(q)) {
383 *flag |= JFS_DISCARD;
384 sbi->minblks_trim = simple_strtoull(
385 minblks_trim, &minblks_trim, 0);
386 } else {
387 pr_err("JFS: discard option " \
388 "not supported on device\n");
389 }
390 break;
391 }
392
393 default:
394 printk("jfs: Unrecognized mount option \"%s\" "
395 " or missing value\n", p);
396 goto cleanup;
397 }
398 }
399
400 if (nls_map != (void *) -1) {
401 /* Discard old (if remount) */
402 unload_nls(sbi->nls_tab);
403 sbi->nls_tab = nls_map;
404 }
405 return 1;
406
407 cleanup:
408 if (nls_map && nls_map != (void *) -1)
409 unload_nls(nls_map);
410 return 0;
411 }
412
413 static int jfs_remount(struct super_block *sb, int *flags, char *data)
414 {
415 s64 newLVSize = 0;
416 int rc = 0;
417 int flag = JFS_SBI(sb)->flag;
418 int ret;
419
420 if (!parse_options(data, sb, &newLVSize, &flag)) {
421 return -EINVAL;
422 }
423
424 if (newLVSize) {
425 if (sb->s_flags & MS_RDONLY) {
426 pr_err("JFS: resize requires volume" \
427 " to be mounted read-write\n");
428 return -EROFS;
429 }
430 rc = jfs_extendfs(sb, newLVSize, 0);
431 if (rc)
432 return rc;
433 }
434
435 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
436 /*
437 * Invalidate any previously read metadata. fsck may have
438 * changed the on-disk data since we mounted r/o
439 */
440 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
441
442 JFS_SBI(sb)->flag = flag;
443 ret = jfs_mount_rw(sb, 1);
444
445 /* mark the fs r/w for quota activity */
446 sb->s_flags &= ~MS_RDONLY;
447
448 dquot_resume(sb, -1);
449 return ret;
450 }
451 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
452 rc = dquot_suspend(sb, -1);
453 if (rc < 0) {
454 return rc;
455 }
456 rc = jfs_umount_rw(sb);
457 JFS_SBI(sb)->flag = flag;
458 return rc;
459 }
460 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
461 if (!(sb->s_flags & MS_RDONLY)) {
462 rc = jfs_umount_rw(sb);
463 if (rc)
464 return rc;
465
466 JFS_SBI(sb)->flag = flag;
467 ret = jfs_mount_rw(sb, 1);
468 return ret;
469 }
470 JFS_SBI(sb)->flag = flag;
471
472 return 0;
473 }
474
475 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
476 {
477 struct jfs_sb_info *sbi;
478 struct inode *inode;
479 int rc;
480 s64 newLVSize = 0;
481 int flag, ret = -EINVAL;
482
483 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
484
485 if (!new_valid_dev(sb->s_bdev->bd_dev))
486 return -EOVERFLOW;
487
488 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
489 if (!sbi)
490 return -ENOMEM;
491
492 sb->s_fs_info = sbi;
493 sb->s_max_links = JFS_LINK_MAX;
494 sbi->sb = sb;
495 sbi->uid = INVALID_UID;
496 sbi->gid = INVALID_GID;
497 sbi->umask = -1;
498
499 /* initialize the mount flag and determine the default error handler */
500 flag = JFS_ERR_REMOUNT_RO;
501
502 if (!parse_options((char *) data, sb, &newLVSize, &flag))
503 goto out_kfree;
504 sbi->flag = flag;
505
506 #ifdef CONFIG_JFS_POSIX_ACL
507 sb->s_flags |= MS_POSIXACL;
508 #endif
509
510 if (newLVSize) {
511 pr_err("resize option for remount only\n");
512 goto out_kfree;
513 }
514
515 /*
516 * Initialize blocksize to 4K.
517 */
518 sb_set_blocksize(sb, PSIZE);
519
520 /*
521 * Set method vectors.
522 */
523 sb->s_op = &jfs_super_operations;
524 sb->s_export_op = &jfs_export_operations;
525 #ifdef CONFIG_QUOTA
526 sb->dq_op = &dquot_operations;
527 sb->s_qcop = &dquot_quotactl_ops;
528 #endif
529
530 /*
531 * Initialize direct-mapping inode/address-space
532 */
533 inode = new_inode(sb);
534 if (inode == NULL) {
535 ret = -ENOMEM;
536 goto out_unload;
537 }
538 inode->i_ino = 0;
539 inode->i_size = sb->s_bdev->bd_inode->i_size;
540 inode->i_mapping->a_ops = &jfs_metapage_aops;
541 insert_inode_hash(inode);
542 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
543
544 sbi->direct_inode = inode;
545
546 rc = jfs_mount(sb);
547 if (rc) {
548 if (!silent) {
549 jfs_err("jfs_mount failed w/return code = %d", rc);
550 }
551 goto out_mount_failed;
552 }
553 if (sb->s_flags & MS_RDONLY)
554 sbi->log = NULL;
555 else {
556 rc = jfs_mount_rw(sb, 0);
557 if (rc) {
558 if (!silent) {
559 jfs_err("jfs_mount_rw failed, return code = %d",
560 rc);
561 }
562 goto out_no_rw;
563 }
564 }
565
566 sb->s_magic = JFS_SUPER_MAGIC;
567
568 if (sbi->mntflag & JFS_OS2)
569 sb->s_d_op = &jfs_ci_dentry_operations;
570
571 inode = jfs_iget(sb, ROOT_I);
572 if (IS_ERR(inode)) {
573 ret = PTR_ERR(inode);
574 goto out_no_rw;
575 }
576 sb->s_root = d_make_root(inode);
577 if (!sb->s_root)
578 goto out_no_root;
579
580 /* logical blocks are represented by 40 bits in pxd_t, etc. */
581 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
582 #if BITS_PER_LONG == 32
583 /*
584 * Page cache is indexed by long.
585 * I would use MAX_LFS_FILESIZE, but it's only half as big
586 */
587 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
588 #endif
589 sb->s_time_gran = 1;
590 return 0;
591
592 out_no_root:
593 jfs_err("jfs_read_super: get root dentry failed");
594
595 out_no_rw:
596 rc = jfs_umount(sb);
597 if (rc) {
598 jfs_err("jfs_umount failed with return code %d", rc);
599 }
600 out_mount_failed:
601 filemap_write_and_wait(sbi->direct_inode->i_mapping);
602 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
603 make_bad_inode(sbi->direct_inode);
604 iput(sbi->direct_inode);
605 sbi->direct_inode = NULL;
606 out_unload:
607 if (sbi->nls_tab)
608 unload_nls(sbi->nls_tab);
609 out_kfree:
610 kfree(sbi);
611 return ret;
612 }
613
614 static int jfs_freeze(struct super_block *sb)
615 {
616 struct jfs_sb_info *sbi = JFS_SBI(sb);
617 struct jfs_log *log = sbi->log;
618 int rc = 0;
619
620 if (!(sb->s_flags & MS_RDONLY)) {
621 txQuiesce(sb);
622 rc = lmLogShutdown(log);
623 if (rc) {
624 jfs_error(sb, "lmLogShutdown failed\n");
625
626 /* let operations fail rather than hang */
627 txResume(sb);
628
629 return rc;
630 }
631 rc = updateSuper(sb, FM_CLEAN);
632 if (rc) {
633 jfs_err("jfs_freeze: updateSuper failed\n");
634 /*
635 * Don't fail here. Everything succeeded except
636 * marking the superblock clean, so there's really
637 * no harm in leaving it frozen for now.
638 */
639 }
640 }
641 return 0;
642 }
643
644 static int jfs_unfreeze(struct super_block *sb)
645 {
646 struct jfs_sb_info *sbi = JFS_SBI(sb);
647 struct jfs_log *log = sbi->log;
648 int rc = 0;
649
650 if (!(sb->s_flags & MS_RDONLY)) {
651 rc = updateSuper(sb, FM_MOUNT);
652 if (rc) {
653 jfs_error(sb, "updateSuper failed\n");
654 goto out;
655 }
656 rc = lmLogInit(log);
657 if (rc)
658 jfs_error(sb, "lmLogInit failed\n");
659 out:
660 txResume(sb);
661 }
662 return rc;
663 }
664
665 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
666 int flags, const char *dev_name, void *data)
667 {
668 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
669 }
670
671 static int jfs_sync_fs(struct super_block *sb, int wait)
672 {
673 struct jfs_log *log = JFS_SBI(sb)->log;
674
675 /* log == NULL indicates read-only mount */
676 if (log) {
677 /*
678 * Write quota structures to quota file, sync_blockdev() will
679 * write them to disk later
680 */
681 dquot_writeback_dquots(sb, -1);
682 jfs_flush_journal(log, wait);
683 jfs_syncpt(log, 0);
684 }
685
686 return 0;
687 }
688
689 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
690 {
691 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
692
693 if (uid_valid(sbi->uid))
694 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
695 if (gid_valid(sbi->gid))
696 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
697 if (sbi->umask != -1)
698 seq_printf(seq, ",umask=%03o", sbi->umask);
699 if (sbi->flag & JFS_NOINTEGRITY)
700 seq_puts(seq, ",nointegrity");
701 if (sbi->flag & JFS_DISCARD)
702 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
703 if (sbi->nls_tab)
704 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
705 if (sbi->flag & JFS_ERR_CONTINUE)
706 seq_printf(seq, ",errors=continue");
707 if (sbi->flag & JFS_ERR_PANIC)
708 seq_printf(seq, ",errors=panic");
709
710 #ifdef CONFIG_QUOTA
711 if (sbi->flag & JFS_USRQUOTA)
712 seq_puts(seq, ",usrquota");
713
714 if (sbi->flag & JFS_GRPQUOTA)
715 seq_puts(seq, ",grpquota");
716 #endif
717
718 return 0;
719 }
720
721 #ifdef CONFIG_QUOTA
722
723 /* Read data from quotafile - avoid pagecache and such because we cannot afford
724 * acquiring the locks... As quota files are never truncated and quota code
725 * itself serializes the operations (and no one else should touch the files)
726 * we don't have to be afraid of races */
727 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
728 size_t len, loff_t off)
729 {
730 struct inode *inode = sb_dqopt(sb)->files[type];
731 sector_t blk = off >> sb->s_blocksize_bits;
732 int err = 0;
733 int offset = off & (sb->s_blocksize - 1);
734 int tocopy;
735 size_t toread;
736 struct buffer_head tmp_bh;
737 struct buffer_head *bh;
738 loff_t i_size = i_size_read(inode);
739
740 if (off > i_size)
741 return 0;
742 if (off+len > i_size)
743 len = i_size-off;
744 toread = len;
745 while (toread > 0) {
746 tocopy = sb->s_blocksize - offset < toread ?
747 sb->s_blocksize - offset : toread;
748
749 tmp_bh.b_state = 0;
750 tmp_bh.b_size = 1 << inode->i_blkbits;
751 err = jfs_get_block(inode, blk, &tmp_bh, 0);
752 if (err)
753 return err;
754 if (!buffer_mapped(&tmp_bh)) /* A hole? */
755 memset(data, 0, tocopy);
756 else {
757 bh = sb_bread(sb, tmp_bh.b_blocknr);
758 if (!bh)
759 return -EIO;
760 memcpy(data, bh->b_data+offset, tocopy);
761 brelse(bh);
762 }
763 offset = 0;
764 toread -= tocopy;
765 data += tocopy;
766 blk++;
767 }
768 return len;
769 }
770
771 /* Write to quotafile */
772 static ssize_t jfs_quota_write(struct super_block *sb, int type,
773 const char *data, size_t len, loff_t off)
774 {
775 struct inode *inode = sb_dqopt(sb)->files[type];
776 sector_t blk = off >> sb->s_blocksize_bits;
777 int err = 0;
778 int offset = off & (sb->s_blocksize - 1);
779 int tocopy;
780 size_t towrite = len;
781 struct buffer_head tmp_bh;
782 struct buffer_head *bh;
783
784 mutex_lock(&inode->i_mutex);
785 while (towrite > 0) {
786 tocopy = sb->s_blocksize - offset < towrite ?
787 sb->s_blocksize - offset : towrite;
788
789 tmp_bh.b_state = 0;
790 tmp_bh.b_size = 1 << inode->i_blkbits;
791 err = jfs_get_block(inode, blk, &tmp_bh, 1);
792 if (err)
793 goto out;
794 if (offset || tocopy != sb->s_blocksize)
795 bh = sb_bread(sb, tmp_bh.b_blocknr);
796 else
797 bh = sb_getblk(sb, tmp_bh.b_blocknr);
798 if (!bh) {
799 err = -EIO;
800 goto out;
801 }
802 lock_buffer(bh);
803 memcpy(bh->b_data+offset, data, tocopy);
804 flush_dcache_page(bh->b_page);
805 set_buffer_uptodate(bh);
806 mark_buffer_dirty(bh);
807 unlock_buffer(bh);
808 brelse(bh);
809 offset = 0;
810 towrite -= tocopy;
811 data += tocopy;
812 blk++;
813 }
814 out:
815 if (len == towrite) {
816 mutex_unlock(&inode->i_mutex);
817 return err;
818 }
819 if (inode->i_size < off+len-towrite)
820 i_size_write(inode, off+len-towrite);
821 inode->i_version++;
822 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
823 mark_inode_dirty(inode);
824 mutex_unlock(&inode->i_mutex);
825 return len - towrite;
826 }
827
828 #endif
829
830 static const struct super_operations jfs_super_operations = {
831 .alloc_inode = jfs_alloc_inode,
832 .destroy_inode = jfs_destroy_inode,
833 .dirty_inode = jfs_dirty_inode,
834 .write_inode = jfs_write_inode,
835 .evict_inode = jfs_evict_inode,
836 .put_super = jfs_put_super,
837 .sync_fs = jfs_sync_fs,
838 .freeze_fs = jfs_freeze,
839 .unfreeze_fs = jfs_unfreeze,
840 .statfs = jfs_statfs,
841 .remount_fs = jfs_remount,
842 .show_options = jfs_show_options,
843 #ifdef CONFIG_QUOTA
844 .quota_read = jfs_quota_read,
845 .quota_write = jfs_quota_write,
846 #endif
847 };
848
849 static const struct export_operations jfs_export_operations = {
850 .fh_to_dentry = jfs_fh_to_dentry,
851 .fh_to_parent = jfs_fh_to_parent,
852 .get_parent = jfs_get_parent,
853 };
854
855 static struct file_system_type jfs_fs_type = {
856 .owner = THIS_MODULE,
857 .name = "jfs",
858 .mount = jfs_do_mount,
859 .kill_sb = kill_block_super,
860 .fs_flags = FS_REQUIRES_DEV,
861 };
862 MODULE_ALIAS_FS("jfs");
863
864 static void init_once(void *foo)
865 {
866 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
867
868 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
869 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
870 init_rwsem(&jfs_ip->rdwrlock);
871 mutex_init(&jfs_ip->commit_mutex);
872 init_rwsem(&jfs_ip->xattr_sem);
873 spin_lock_init(&jfs_ip->ag_lock);
874 jfs_ip->active_ag = -1;
875 inode_init_once(&jfs_ip->vfs_inode);
876 }
877
878 static int __init init_jfs_fs(void)
879 {
880 int i;
881 int rc;
882
883 jfs_inode_cachep =
884 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
885 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
886 init_once);
887 if (jfs_inode_cachep == NULL)
888 return -ENOMEM;
889
890 /*
891 * Metapage initialization
892 */
893 rc = metapage_init();
894 if (rc) {
895 jfs_err("metapage_init failed w/rc = %d", rc);
896 goto free_slab;
897 }
898
899 /*
900 * Transaction Manager initialization
901 */
902 rc = txInit();
903 if (rc) {
904 jfs_err("txInit failed w/rc = %d", rc);
905 goto free_metapage;
906 }
907
908 /*
909 * I/O completion thread (endio)
910 */
911 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
912 if (IS_ERR(jfsIOthread)) {
913 rc = PTR_ERR(jfsIOthread);
914 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
915 goto end_txmngr;
916 }
917
918 if (commit_threads < 1)
919 commit_threads = num_online_cpus();
920 if (commit_threads > MAX_COMMIT_THREADS)
921 commit_threads = MAX_COMMIT_THREADS;
922
923 for (i = 0; i < commit_threads; i++) {
924 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
925 if (IS_ERR(jfsCommitThread[i])) {
926 rc = PTR_ERR(jfsCommitThread[i]);
927 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
928 commit_threads = i;
929 goto kill_committask;
930 }
931 }
932
933 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
934 if (IS_ERR(jfsSyncThread)) {
935 rc = PTR_ERR(jfsSyncThread);
936 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
937 goto kill_committask;
938 }
939
940 #ifdef PROC_FS_JFS
941 jfs_proc_init();
942 #endif
943
944 rc = register_filesystem(&jfs_fs_type);
945 if (!rc)
946 return 0;
947
948 #ifdef PROC_FS_JFS
949 jfs_proc_clean();
950 #endif
951 kthread_stop(jfsSyncThread);
952 kill_committask:
953 for (i = 0; i < commit_threads; i++)
954 kthread_stop(jfsCommitThread[i]);
955 kthread_stop(jfsIOthread);
956 end_txmngr:
957 txExit();
958 free_metapage:
959 metapage_exit();
960 free_slab:
961 kmem_cache_destroy(jfs_inode_cachep);
962 return rc;
963 }
964
965 static void __exit exit_jfs_fs(void)
966 {
967 int i;
968
969 jfs_info("exit_jfs_fs called");
970
971 txExit();
972 metapage_exit();
973
974 kthread_stop(jfsIOthread);
975 for (i = 0; i < commit_threads; i++)
976 kthread_stop(jfsCommitThread[i]);
977 kthread_stop(jfsSyncThread);
978 #ifdef PROC_FS_JFS
979 jfs_proc_clean();
980 #endif
981 unregister_filesystem(&jfs_fs_type);
982
983 /*
984 * Make sure all delayed rcu free inodes are flushed before we
985 * destroy cache.
986 */
987 rcu_barrier();
988 kmem_cache_destroy(jfs_inode_cachep);
989 }
990
991 module_init(init_jfs_fs)
992 module_exit(exit_jfs_fs)
Linux with added FPC-III support