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mic: vop: Fix use-after-free on remove
[linux/fpc-iii.git] / fs / jfs / super.c
blob65d8fc87ab1145a1ac52ff5909ecd2888b79342e
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 <linux/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 #include "jfs_dinode.h"
49
50 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
51 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
52 MODULE_LICENSE("GPL");
53
54 static struct kmem_cache *jfs_inode_cachep;
55
56 static const struct super_operations jfs_super_operations;
57 static const struct export_operations jfs_export_operations;
58 static struct file_system_type jfs_fs_type;
59
60 #define MAX_COMMIT_THREADS 64
61 static int commit_threads;
62 module_param(commit_threads, int, 0);
63 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
64
65 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
66 struct task_struct *jfsIOthread;
67 struct task_struct *jfsSyncThread;
68
69 #ifdef CONFIG_JFS_DEBUG
70 int jfsloglevel = JFS_LOGLEVEL_WARN;
71 module_param(jfsloglevel, int, 0644);
72 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
73 #endif
74
75 static void jfs_handle_error(struct super_block *sb)
76 {
77 struct jfs_sb_info *sbi = JFS_SBI(sb);
78
79 if (sb_rdonly(sb))
80 return;
81
82 updateSuper(sb, FM_DIRTY);
83
84 if (sbi->flag & JFS_ERR_PANIC)
85 panic("JFS (device %s): panic forced after error\n",
86 sb->s_id);
87 else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
88 jfs_err("ERROR: (device %s): remounting filesystem as read-only",
89 sb->s_id);
90 sb->s_flags |= SB_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): %ps: %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 #ifdef CONFIG_QUOTA
122 memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot));
123 #endif
124 return &jfs_inode->vfs_inode;
125 }
126
127 static void jfs_i_callback(struct rcu_head *head)
128 {
129 struct inode *inode = container_of(head, struct inode, i_rcu);
130 struct jfs_inode_info *ji = JFS_IP(inode);
131 kmem_cache_free(jfs_inode_cachep, ji);
132 }
133
134 static void jfs_destroy_inode(struct inode *inode)
135 {
136 struct jfs_inode_info *ji = JFS_IP(inode);
137
138 BUG_ON(!list_empty(&ji->anon_inode_list));
139
140 spin_lock_irq(&ji->ag_lock);
141 if (ji->active_ag != -1) {
142 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
143 atomic_dec(&bmap->db_active[ji->active_ag]);
144 ji->active_ag = -1;
145 }
146 spin_unlock_irq(&ji->ag_lock);
147 call_rcu(&inode->i_rcu, jfs_i_callback);
148 }
149
150 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
151 {
152 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
153 s64 maxinodes;
154 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
155
156 jfs_info("In jfs_statfs");
157 buf->f_type = JFS_SUPER_MAGIC;
158 buf->f_bsize = sbi->bsize;
159 buf->f_blocks = sbi->bmap->db_mapsize;
160 buf->f_bfree = sbi->bmap->db_nfree;
161 buf->f_bavail = sbi->bmap->db_nfree;
162 /*
163 * If we really return the number of allocated & free inodes, some
164 * applications will fail because they won't see enough free inodes.
165 * We'll try to calculate some guess as to how many inodes we can
166 * really allocate
167 *
168 * buf->f_files = atomic_read(&imap->im_numinos);
169 * buf->f_ffree = atomic_read(&imap->im_numfree);
170 */
171 maxinodes = min((s64) atomic_read(&imap->im_numinos) +
172 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
173 << L2INOSPEREXT), (s64) 0xffffffffLL);
174 buf->f_files = maxinodes;
175 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
176 atomic_read(&imap->im_numfree));
177 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
178 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
179 sizeof(sbi->uuid)/2);
180
181 buf->f_namelen = JFS_NAME_MAX;
182 return 0;
183 }
184
185 #ifdef CONFIG_QUOTA
186 static int jfs_quota_off(struct super_block *sb, int type);
187 static int jfs_quota_on(struct super_block *sb, int type, int format_id,
188 const struct path *path);
189
190 static void jfs_quota_off_umount(struct super_block *sb)
191 {
192 int type;
193
194 for (type = 0; type < MAXQUOTAS; type++)
195 jfs_quota_off(sb, type);
196 }
197
198 static const struct quotactl_ops jfs_quotactl_ops = {
199 .quota_on = jfs_quota_on,
200 .quota_off = jfs_quota_off,
201 .quota_sync = dquot_quota_sync,
202 .get_state = dquot_get_state,
203 .set_info = dquot_set_dqinfo,
204 .get_dqblk = dquot_get_dqblk,
205 .set_dqblk = dquot_set_dqblk,
206 .get_nextdqblk = dquot_get_next_dqblk,
207 };
208 #else
209 static inline void jfs_quota_off_umount(struct super_block *sb)
210 {
211 }
212 #endif
213
214 static void jfs_put_super(struct super_block *sb)
215 {
216 struct jfs_sb_info *sbi = JFS_SBI(sb);
217 int rc;
218
219 jfs_info("In jfs_put_super");
220
221 jfs_quota_off_umount(sb);
222
223 rc = jfs_umount(sb);
224 if (rc)
225 jfs_err("jfs_umount failed with return code %d", rc);
226
227 unload_nls(sbi->nls_tab);
228
229 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
230 iput(sbi->direct_inode);
231
232 kfree(sbi);
233 }
234
235 enum {
236 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
237 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
238 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask,
239 Opt_discard, Opt_nodiscard, Opt_discard_minblk
240 };
241
242 static const match_table_t tokens = {
243 {Opt_integrity, "integrity"},
244 {Opt_nointegrity, "nointegrity"},
245 {Opt_iocharset, "iocharset=%s"},
246 {Opt_resize, "resize=%u"},
247 {Opt_resize_nosize, "resize"},
248 {Opt_errors, "errors=%s"},
249 {Opt_ignore, "noquota"},
250 {Opt_quota, "quota"},
251 {Opt_usrquota, "usrquota"},
252 {Opt_grpquota, "grpquota"},
253 {Opt_uid, "uid=%u"},
254 {Opt_gid, "gid=%u"},
255 {Opt_umask, "umask=%u"},
256 {Opt_discard, "discard"},
257 {Opt_nodiscard, "nodiscard"},
258 {Opt_discard_minblk, "discard=%u"},
259 {Opt_err, NULL}
260 };
261
262 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
263 int *flag)
264 {
265 void *nls_map = (void *)-1; /* -1: no change; NULL: none */
266 char *p;
267 struct jfs_sb_info *sbi = JFS_SBI(sb);
268
269 *newLVSize = 0;
270
271 if (!options)
272 return 1;
273
274 while ((p = strsep(&options, ",")) != NULL) {
275 substring_t args[MAX_OPT_ARGS];
276 int token;
277 if (!*p)
278 continue;
279
280 token = match_token(p, tokens, args);
281 switch (token) {
282 case Opt_integrity:
283 *flag &= ~JFS_NOINTEGRITY;
284 break;
285 case Opt_nointegrity:
286 *flag |= JFS_NOINTEGRITY;
287 break;
288 case Opt_ignore:
289 /* Silently ignore the quota options */
290 /* Don't do anything ;-) */
291 break;
292 case Opt_iocharset:
293 if (nls_map && nls_map != (void *) -1)
294 unload_nls(nls_map);
295 if (!strcmp(args[0].from, "none"))
296 nls_map = NULL;
297 else {
298 nls_map = load_nls(args[0].from);
299 if (!nls_map) {
300 pr_err("JFS: charset not found\n");
301 goto cleanup;
302 }
303 }
304 break;
305 case Opt_resize:
306 {
307 char *resize = args[0].from;
308 int rc = kstrtoll(resize, 0, newLVSize);
309
310 if (rc)
311 goto cleanup;
312 break;
313 }
314 case Opt_resize_nosize:
315 {
316 *newLVSize = i_size_read(sb->s_bdev->bd_inode) >>
317 sb->s_blocksize_bits;
318 if (*newLVSize == 0)
319 pr_err("JFS: Cannot determine volume size\n");
320 break;
321 }
322 case Opt_errors:
323 {
324 char *errors = args[0].from;
325 if (!errors || !*errors)
326 goto cleanup;
327 if (!strcmp(errors, "continue")) {
328 *flag &= ~JFS_ERR_REMOUNT_RO;
329 *flag &= ~JFS_ERR_PANIC;
330 *flag |= JFS_ERR_CONTINUE;
331 } else if (!strcmp(errors, "remount-ro")) {
332 *flag &= ~JFS_ERR_CONTINUE;
333 *flag &= ~JFS_ERR_PANIC;
334 *flag |= JFS_ERR_REMOUNT_RO;
335 } else if (!strcmp(errors, "panic")) {
336 *flag &= ~JFS_ERR_CONTINUE;
337 *flag &= ~JFS_ERR_REMOUNT_RO;
338 *flag |= JFS_ERR_PANIC;
339 } else {
340 pr_err("JFS: %s is an invalid error handler\n",
341 errors);
342 goto cleanup;
343 }
344 break;
345 }
346
347 #ifdef CONFIG_QUOTA
348 case Opt_quota:
349 case Opt_usrquota:
350 *flag |= JFS_USRQUOTA;
351 break;
352 case Opt_grpquota:
353 *flag |= JFS_GRPQUOTA;
354 break;
355 #else
356 case Opt_usrquota:
357 case Opt_grpquota:
358 case Opt_quota:
359 pr_err("JFS: quota operations not supported\n");
360 break;
361 #endif
362 case Opt_uid:
363 {
364 char *uid = args[0].from;
365 uid_t val;
366 int rc = kstrtouint(uid, 0, &val);
367
368 if (rc)
369 goto cleanup;
370 sbi->uid = make_kuid(current_user_ns(), val);
371 if (!uid_valid(sbi->uid))
372 goto cleanup;
373 break;
374 }
375
376 case Opt_gid:
377 {
378 char *gid = args[0].from;
379 gid_t val;
380 int rc = kstrtouint(gid, 0, &val);
381
382 if (rc)
383 goto cleanup;
384 sbi->gid = make_kgid(current_user_ns(), val);
385 if (!gid_valid(sbi->gid))
386 goto cleanup;
387 break;
388 }
389
390 case Opt_umask:
391 {
392 char *umask = args[0].from;
393 int rc = kstrtouint(umask, 8, &sbi->umask);
394
395 if (rc)
396 goto cleanup;
397 if (sbi->umask & ~0777) {
398 pr_err("JFS: Invalid value of umask\n");
399 goto cleanup;
400 }
401 break;
402 }
403
404 case Opt_discard:
405 {
406 struct request_queue *q = bdev_get_queue(sb->s_bdev);
407 /* if set to 1, even copying files will cause
408 * trimming :O
409 * -> user has more control over the online trimming
410 */
411 sbi->minblks_trim = 64;
412 if (blk_queue_discard(q))
413 *flag |= JFS_DISCARD;
414 else
415 pr_err("JFS: discard option not supported on device\n");
416 break;
417 }
418
419 case Opt_nodiscard:
420 *flag &= ~JFS_DISCARD;
421 break;
422
423 case Opt_discard_minblk:
424 {
425 struct request_queue *q = bdev_get_queue(sb->s_bdev);
426 char *minblks_trim = args[0].from;
427 int rc;
428 if (blk_queue_discard(q)) {
429 *flag |= JFS_DISCARD;
430 rc = kstrtouint(minblks_trim, 0,
431 &sbi->minblks_trim);
432 if (rc)
433 goto cleanup;
434 } else
435 pr_err("JFS: discard option not supported on device\n");
436 break;
437 }
438
439 default:
440 printk("jfs: Unrecognized mount option \"%s\" or missing value\n",
441 p);
442 goto cleanup;
443 }
444 }
445
446 if (nls_map != (void *) -1) {
447 /* Discard old (if remount) */
448 unload_nls(sbi->nls_tab);
449 sbi->nls_tab = nls_map;
450 }
451 return 1;
452
453 cleanup:
454 if (nls_map && nls_map != (void *) -1)
455 unload_nls(nls_map);
456 return 0;
457 }
458
459 static int jfs_remount(struct super_block *sb, int *flags, char *data)
460 {
461 s64 newLVSize = 0;
462 int rc = 0;
463 int flag = JFS_SBI(sb)->flag;
464 int ret;
465
466 sync_filesystem(sb);
467 if (!parse_options(data, sb, &newLVSize, &flag))
468 return -EINVAL;
469
470 if (newLVSize) {
471 if (sb_rdonly(sb)) {
472 pr_err("JFS: resize requires volume to be mounted read-write\n");
473 return -EROFS;
474 }
475 rc = jfs_extendfs(sb, newLVSize, 0);
476 if (rc)
477 return rc;
478 }
479
480 if (sb_rdonly(sb) && !(*flags & SB_RDONLY)) {
481 /*
482 * Invalidate any previously read metadata. fsck may have
483 * changed the on-disk data since we mounted r/o
484 */
485 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
486
487 JFS_SBI(sb)->flag = flag;
488 ret = jfs_mount_rw(sb, 1);
489
490 /* mark the fs r/w for quota activity */
491 sb->s_flags &= ~SB_RDONLY;
492
493 dquot_resume(sb, -1);
494 return ret;
495 }
496 if (!sb_rdonly(sb) && (*flags & SB_RDONLY)) {
497 rc = dquot_suspend(sb, -1);
498 if (rc < 0)
499 return rc;
500 rc = jfs_umount_rw(sb);
501 JFS_SBI(sb)->flag = flag;
502 return rc;
503 }
504 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
505 if (!sb_rdonly(sb)) {
506 rc = jfs_umount_rw(sb);
507 if (rc)
508 return rc;
509
510 JFS_SBI(sb)->flag = flag;
511 ret = jfs_mount_rw(sb, 1);
512 return ret;
513 }
514 JFS_SBI(sb)->flag = flag;
515
516 return 0;
517 }
518
519 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
520 {
521 struct jfs_sb_info *sbi;
522 struct inode *inode;
523 int rc;
524 s64 newLVSize = 0;
525 int flag, ret = -EINVAL;
526
527 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
528
529 sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL);
530 if (!sbi)
531 return -ENOMEM;
532
533 sb->s_fs_info = sbi;
534 sb->s_max_links = JFS_LINK_MAX;
535 sbi->sb = sb;
536 sbi->uid = INVALID_UID;
537 sbi->gid = INVALID_GID;
538 sbi->umask = -1;
539
540 /* initialize the mount flag and determine the default error handler */
541 flag = JFS_ERR_REMOUNT_RO;
542
543 if (!parse_options((char *) data, sb, &newLVSize, &flag))
544 goto out_kfree;
545 sbi->flag = flag;
546
547 #ifdef CONFIG_JFS_POSIX_ACL
548 sb->s_flags |= SB_POSIXACL;
549 #endif
550
551 if (newLVSize) {
552 pr_err("resize option for remount only\n");
553 goto out_kfree;
554 }
555
556 /*
557 * Initialize blocksize to 4K.
558 */
559 sb_set_blocksize(sb, PSIZE);
560
561 /*
562 * Set method vectors.
563 */
564 sb->s_op = &jfs_super_operations;
565 sb->s_export_op = &jfs_export_operations;
566 sb->s_xattr = jfs_xattr_handlers;
567 #ifdef CONFIG_QUOTA
568 sb->dq_op = &dquot_operations;
569 sb->s_qcop = &jfs_quotactl_ops;
570 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
571 #endif
572
573 /*
574 * Initialize direct-mapping inode/address-space
575 */
576 inode = new_inode(sb);
577 if (inode == NULL) {
578 ret = -ENOMEM;
579 goto out_unload;
580 }
581 inode->i_ino = 0;
582 inode->i_size = i_size_read(sb->s_bdev->bd_inode);
583 inode->i_mapping->a_ops = &jfs_metapage_aops;
584 inode_fake_hash(inode);
585 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
586
587 sbi->direct_inode = inode;
588
589 rc = jfs_mount(sb);
590 if (rc) {
591 if (!silent)
592 jfs_err("jfs_mount failed w/return code = %d", rc);
593 goto out_mount_failed;
594 }
595 if (sb_rdonly(sb))
596 sbi->log = NULL;
597 else {
598 rc = jfs_mount_rw(sb, 0);
599 if (rc) {
600 if (!silent) {
601 jfs_err("jfs_mount_rw failed, return code = %d",
602 rc);
603 }
604 goto out_no_rw;
605 }
606 }
607
608 sb->s_magic = JFS_SUPER_MAGIC;
609
610 if (sbi->mntflag & JFS_OS2)
611 sb->s_d_op = &jfs_ci_dentry_operations;
612
613 inode = jfs_iget(sb, ROOT_I);
614 if (IS_ERR(inode)) {
615 ret = PTR_ERR(inode);
616 goto out_no_rw;
617 }
618 sb->s_root = d_make_root(inode);
619 if (!sb->s_root)
620 goto out_no_root;
621
622 /* logical blocks are represented by 40 bits in pxd_t, etc.
623 * and page cache is indexed by long
624 */
625 sb->s_maxbytes = min(((loff_t)sb->s_blocksize) << 40, MAX_LFS_FILESIZE);
626 sb->s_time_gran = 1;
627 return 0;
628
629 out_no_root:
630 jfs_err("jfs_read_super: get root dentry failed");
631
632 out_no_rw:
633 rc = jfs_umount(sb);
634 if (rc)
635 jfs_err("jfs_umount failed with return code %d", rc);
636 out_mount_failed:
637 filemap_write_and_wait(sbi->direct_inode->i_mapping);
638 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
639 make_bad_inode(sbi->direct_inode);
640 iput(sbi->direct_inode);
641 sbi->direct_inode = NULL;
642 out_unload:
643 unload_nls(sbi->nls_tab);
644 out_kfree:
645 kfree(sbi);
646 return ret;
647 }
648
649 static int jfs_freeze(struct super_block *sb)
650 {
651 struct jfs_sb_info *sbi = JFS_SBI(sb);
652 struct jfs_log *log = sbi->log;
653 int rc = 0;
654
655 if (!sb_rdonly(sb)) {
656 txQuiesce(sb);
657 rc = lmLogShutdown(log);
658 if (rc) {
659 jfs_error(sb, "lmLogShutdown failed\n");
660
661 /* let operations fail rather than hang */
662 txResume(sb);
663
664 return rc;
665 }
666 rc = updateSuper(sb, FM_CLEAN);
667 if (rc) {
668 jfs_err("jfs_freeze: updateSuper failed");
669 /*
670 * Don't fail here. Everything succeeded except
671 * marking the superblock clean, so there's really
672 * no harm in leaving it frozen for now.
673 */
674 }
675 }
676 return 0;
677 }
678
679 static int jfs_unfreeze(struct super_block *sb)
680 {
681 struct jfs_sb_info *sbi = JFS_SBI(sb);
682 struct jfs_log *log = sbi->log;
683 int rc = 0;
684
685 if (!sb_rdonly(sb)) {
686 rc = updateSuper(sb, FM_MOUNT);
687 if (rc) {
688 jfs_error(sb, "updateSuper failed\n");
689 goto out;
690 }
691 rc = lmLogInit(log);
692 if (rc)
693 jfs_error(sb, "lmLogInit failed\n");
694 out:
695 txResume(sb);
696 }
697 return rc;
698 }
699
700 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
701 int flags, const char *dev_name, void *data)
702 {
703 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
704 }
705
706 static int jfs_sync_fs(struct super_block *sb, int wait)
707 {
708 struct jfs_log *log = JFS_SBI(sb)->log;
709
710 /* log == NULL indicates read-only mount */
711 if (log) {
712 /*
713 * Write quota structures to quota file, sync_blockdev() will
714 * write them to disk later
715 */
716 dquot_writeback_dquots(sb, -1);
717 jfs_flush_journal(log, wait);
718 jfs_syncpt(log, 0);
719 }
720
721 return 0;
722 }
723
724 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
725 {
726 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
727
728 if (uid_valid(sbi->uid))
729 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
730 if (gid_valid(sbi->gid))
731 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
732 if (sbi->umask != -1)
733 seq_printf(seq, ",umask=%03o", sbi->umask);
734 if (sbi->flag & JFS_NOINTEGRITY)
735 seq_puts(seq, ",nointegrity");
736 if (sbi->flag & JFS_DISCARD)
737 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
738 if (sbi->nls_tab)
739 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
740 if (sbi->flag & JFS_ERR_CONTINUE)
741 seq_printf(seq, ",errors=continue");
742 if (sbi->flag & JFS_ERR_PANIC)
743 seq_printf(seq, ",errors=panic");
744
745 #ifdef CONFIG_QUOTA
746 if (sbi->flag & JFS_USRQUOTA)
747 seq_puts(seq, ",usrquota");
748
749 if (sbi->flag & JFS_GRPQUOTA)
750 seq_puts(seq, ",grpquota");
751 #endif
752
753 return 0;
754 }
755
756 #ifdef CONFIG_QUOTA
757
758 /* Read data from quotafile - avoid pagecache and such because we cannot afford
759 * acquiring the locks... As quota files are never truncated and quota code
760 * itself serializes the operations (and no one else should touch the files)
761 * we don't have to be afraid of races */
762 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
763 size_t len, loff_t off)
764 {
765 struct inode *inode = sb_dqopt(sb)->files[type];
766 sector_t blk = off >> sb->s_blocksize_bits;
767 int err = 0;
768 int offset = off & (sb->s_blocksize - 1);
769 int tocopy;
770 size_t toread;
771 struct buffer_head tmp_bh;
772 struct buffer_head *bh;
773 loff_t i_size = i_size_read(inode);
774
775 if (off > i_size)
776 return 0;
777 if (off+len > i_size)
778 len = i_size-off;
779 toread = len;
780 while (toread > 0) {
781 tocopy = sb->s_blocksize - offset < toread ?
782 sb->s_blocksize - offset : toread;
783
784 tmp_bh.b_state = 0;
785 tmp_bh.b_size = i_blocksize(inode);
786 err = jfs_get_block(inode, blk, &tmp_bh, 0);
787 if (err)
788 return err;
789 if (!buffer_mapped(&tmp_bh)) /* A hole? */
790 memset(data, 0, tocopy);
791 else {
792 bh = sb_bread(sb, tmp_bh.b_blocknr);
793 if (!bh)
794 return -EIO;
795 memcpy(data, bh->b_data+offset, tocopy);
796 brelse(bh);
797 }
798 offset = 0;
799 toread -= tocopy;
800 data += tocopy;
801 blk++;
802 }
803 return len;
804 }
805
806 /* Write to quotafile */
807 static ssize_t jfs_quota_write(struct super_block *sb, int type,
808 const char *data, size_t len, loff_t off)
809 {
810 struct inode *inode = sb_dqopt(sb)->files[type];
811 sector_t blk = off >> sb->s_blocksize_bits;
812 int err = 0;
813 int offset = off & (sb->s_blocksize - 1);
814 int tocopy;
815 size_t towrite = len;
816 struct buffer_head tmp_bh;
817 struct buffer_head *bh;
818
819 inode_lock(inode);
820 while (towrite > 0) {
821 tocopy = sb->s_blocksize - offset < towrite ?
822 sb->s_blocksize - offset : towrite;
823
824 tmp_bh.b_state = 0;
825 tmp_bh.b_size = i_blocksize(inode);
826 err = jfs_get_block(inode, blk, &tmp_bh, 1);
827 if (err)
828 goto out;
829 if (offset || tocopy != sb->s_blocksize)
830 bh = sb_bread(sb, tmp_bh.b_blocknr);
831 else
832 bh = sb_getblk(sb, tmp_bh.b_blocknr);
833 if (!bh) {
834 err = -EIO;
835 goto out;
836 }
837 lock_buffer(bh);
838 memcpy(bh->b_data+offset, data, tocopy);
839 flush_dcache_page(bh->b_page);
840 set_buffer_uptodate(bh);
841 mark_buffer_dirty(bh);
842 unlock_buffer(bh);
843 brelse(bh);
844 offset = 0;
845 towrite -= tocopy;
846 data += tocopy;
847 blk++;
848 }
849 out:
850 if (len == towrite) {
851 inode_unlock(inode);
852 return err;
853 }
854 if (inode->i_size < off+len-towrite)
855 i_size_write(inode, off+len-towrite);
856 inode->i_mtime = inode->i_ctime = current_time(inode);
857 mark_inode_dirty(inode);
858 inode_unlock(inode);
859 return len - towrite;
860 }
861
862 static struct dquot **jfs_get_dquots(struct inode *inode)
863 {
864 return JFS_IP(inode)->i_dquot;
865 }
866
867 static int jfs_quota_on(struct super_block *sb, int type, int format_id,
868 const struct path *path)
869 {
870 int err;
871 struct inode *inode;
872
873 err = dquot_quota_on(sb, type, format_id, path);
874 if (err)
875 return err;
876
877 inode = d_inode(path->dentry);
878 inode_lock(inode);
879 JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL;
880 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
881 S_NOATIME | S_IMMUTABLE);
882 inode_unlock(inode);
883 mark_inode_dirty(inode);
884
885 return 0;
886 }
887
888 static int jfs_quota_off(struct super_block *sb, int type)
889 {
890 struct inode *inode = sb_dqopt(sb)->files[type];
891 int err;
892
893 if (!inode || !igrab(inode))
894 goto out;
895
896 err = dquot_quota_off(sb, type);
897 if (err)
898 goto out_put;
899
900 inode_lock(inode);
901 JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL);
902 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
903 inode_unlock(inode);
904 mark_inode_dirty(inode);
905 out_put:
906 iput(inode);
907 return err;
908 out:
909 return dquot_quota_off(sb, type);
910 }
911 #endif
912
913 static const struct super_operations jfs_super_operations = {
914 .alloc_inode = jfs_alloc_inode,
915 .destroy_inode = jfs_destroy_inode,
916 .dirty_inode = jfs_dirty_inode,
917 .write_inode = jfs_write_inode,
918 .evict_inode = jfs_evict_inode,
919 .put_super = jfs_put_super,
920 .sync_fs = jfs_sync_fs,
921 .freeze_fs = jfs_freeze,
922 .unfreeze_fs = jfs_unfreeze,
923 .statfs = jfs_statfs,
924 .remount_fs = jfs_remount,
925 .show_options = jfs_show_options,
926 #ifdef CONFIG_QUOTA
927 .quota_read = jfs_quota_read,
928 .quota_write = jfs_quota_write,
929 .get_dquots = jfs_get_dquots,
930 #endif
931 };
932
933 static const struct export_operations jfs_export_operations = {
934 .fh_to_dentry = jfs_fh_to_dentry,
935 .fh_to_parent = jfs_fh_to_parent,
936 .get_parent = jfs_get_parent,
937 };
938
939 static struct file_system_type jfs_fs_type = {
940 .owner = THIS_MODULE,
941 .name = "jfs",
942 .mount = jfs_do_mount,
943 .kill_sb = kill_block_super,
944 .fs_flags = FS_REQUIRES_DEV,
945 };
946 MODULE_ALIAS_FS("jfs");
947
948 static void init_once(void *foo)
949 {
950 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
951
952 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
953 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
954 init_rwsem(&jfs_ip->rdwrlock);
955 mutex_init(&jfs_ip->commit_mutex);
956 init_rwsem(&jfs_ip->xattr_sem);
957 spin_lock_init(&jfs_ip->ag_lock);
958 jfs_ip->active_ag = -1;
959 inode_init_once(&jfs_ip->vfs_inode);
960 }
961
962 static int __init init_jfs_fs(void)
963 {
964 int i;
965 int rc;
966
967 jfs_inode_cachep =
968 kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info),
969 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
970 offsetof(struct jfs_inode_info, i_inline), IDATASIZE,
971 init_once);
972 if (jfs_inode_cachep == NULL)
973 return -ENOMEM;
974
975 /*
976 * Metapage initialization
977 */
978 rc = metapage_init();
979 if (rc) {
980 jfs_err("metapage_init failed w/rc = %d", rc);
981 goto free_slab;
982 }
983
984 /*
985 * Transaction Manager initialization
986 */
987 rc = txInit();
988 if (rc) {
989 jfs_err("txInit failed w/rc = %d", rc);
990 goto free_metapage;
991 }
992
993 /*
994 * I/O completion thread (endio)
995 */
996 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
997 if (IS_ERR(jfsIOthread)) {
998 rc = PTR_ERR(jfsIOthread);
999 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
1000 goto end_txmngr;
1001 }
1002
1003 if (commit_threads < 1)
1004 commit_threads = num_online_cpus();
1005 if (commit_threads > MAX_COMMIT_THREADS)
1006 commit_threads = MAX_COMMIT_THREADS;
1007
1008 for (i = 0; i < commit_threads; i++) {
1009 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
1010 "jfsCommit");
1011 if (IS_ERR(jfsCommitThread[i])) {
1012 rc = PTR_ERR(jfsCommitThread[i]);
1013 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
1014 commit_threads = i;
1015 goto kill_committask;
1016 }
1017 }
1018
1019 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
1020 if (IS_ERR(jfsSyncThread)) {
1021 rc = PTR_ERR(jfsSyncThread);
1022 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
1023 goto kill_committask;
1024 }
1025
1026 #ifdef PROC_FS_JFS
1027 jfs_proc_init();
1028 #endif
1029
1030 rc = register_filesystem(&jfs_fs_type);
1031 if (!rc)
1032 return 0;
1033
1034 #ifdef PROC_FS_JFS
1035 jfs_proc_clean();
1036 #endif
1037 kthread_stop(jfsSyncThread);
1038 kill_committask:
1039 for (i = 0; i < commit_threads; i++)
1040 kthread_stop(jfsCommitThread[i]);
1041 kthread_stop(jfsIOthread);
1042 end_txmngr:
1043 txExit();
1044 free_metapage:
1045 metapage_exit();
1046 free_slab:
1047 kmem_cache_destroy(jfs_inode_cachep);
1048 return rc;
1049 }
1050
1051 static void __exit exit_jfs_fs(void)
1052 {
1053 int i;
1054
1055 jfs_info("exit_jfs_fs called");
1056
1057 txExit();
1058 metapage_exit();
1059
1060 kthread_stop(jfsIOthread);
1061 for (i = 0; i < commit_threads; i++)
1062 kthread_stop(jfsCommitThread[i]);
1063 kthread_stop(jfsSyncThread);
1064 #ifdef PROC_FS_JFS
1065 jfs_proc_clean();
1066 #endif
1067 unregister_filesystem(&jfs_fs_type);
1068
1069 /*
1070 * Make sure all delayed rcu free inodes are flushed before we
1071 * destroy cache.
1072 */
1073 rcu_barrier();
1074 kmem_cache_destroy(jfs_inode_cachep);
1075 }
1076
1077 module_init(init_jfs_fs)
1078 module_exit(exit_jfs_fs)
Linux with added FPC-III support