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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
48MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
49MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
50MODULE_LICENSE("GPL");
51
52static struct kmem_cache * jfs_inode_cachep;
53
54static const struct super_operations jfs_super_operations;
55static const struct export_operations jfs_export_operations;
56static struct file_system_type jfs_fs_type;
57
58#define MAX_COMMIT_THREADS 64
59static int commit_threads = 0;
60module_param(commit_threads, int, 0);
61MODULE_PARM_DESC(commit_threads, "Number of commit threads");
62
63static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
64struct task_struct *jfsIOthread;
65struct task_struct *jfsSyncThread;
66
67#ifdef CONFIG_JFS_DEBUG
68int jfsloglevel = JFS_LOGLEVEL_WARN;
69module_param(jfsloglevel, int, 0644);
70MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
71#endif
72
73static 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
93}
94
95void 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
109static 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
119static 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
126static 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
142static 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
156
157
158
159
160
161
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
177static 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
198enum {
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
205static 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
225static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
226 int *flag)
227{
228 void *nls_map = (void *)-1;
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
253
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
357
358
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
398 unload_nls(sbi->nls_tab);
399 sbi->nls_tab = nls_map;
400 }
401 return 1;
402
403cleanup:
404 if (nls_map && nls_map != (void *) -1)
405 unload_nls(nls_map);
406 return 0;
407}
408
409static 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
434
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
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
471static 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
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
513
514 sb_set_blocksize(sb, PSIZE);
515
516
517
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
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
577 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
578#if BITS_PER_LONG == 32
579
580
581
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
588out_no_root:
589 jfs_err("jfs_read_super: get root dentry failed");
590
591out_no_rw:
592 rc = jfs_umount(sb);
593 if (rc) {
594 jfs_err("jfs_umount failed with return code %d", rc);
595 }
596out_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;
602out_unload:
603 if (sbi->nls_tab)
604 unload_nls(sbi->nls_tab);
605out_kfree:
606 kfree(sbi);
607 return ret;
608}
609
610static 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
615 if (!(sb->s_flags & MS_RDONLY)) {
616 txQuiesce(sb);
617 lmLogShutdown(log);
618 updateSuper(sb, FM_CLEAN);
619 }
620 return 0;
621}
622
623static int jfs_unfreeze(struct super_block *sb)
624{
625 struct jfs_sb_info *sbi = JFS_SBI(sb);
626 struct jfs_log *log = sbi->log;
627 int rc = 0;
628
629 if (!(sb->s_flags & MS_RDONLY)) {
630 updateSuper(sb, FM_MOUNT);
631 if ((rc = lmLogInit(log)))
632 jfs_err("jfs_unlock failed with return code %d", rc);
633 else
634 txResume(sb);
635 }
636 return 0;
637}
638
639static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
640 int flags, const char *dev_name, void *data)
641{
642 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
643}
644
645static int jfs_sync_fs(struct super_block *sb, int wait)
646{
647 struct jfs_log *log = JFS_SBI(sb)->log;
648
649
650 if (log) {
651
652
653
654
655 dquot_writeback_dquots(sb, -1);
656 jfs_flush_journal(log, wait);
657 jfs_syncpt(log, 0);
658 }
659
660 return 0;
661}
662
663static int jfs_show_options(struct seq_file *seq, struct dentry *root)
664{
665 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
666
667 if (uid_valid(sbi->uid))
668 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
669 if (gid_valid(sbi->gid))
670 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
671 if (sbi->umask != -1)
672 seq_printf(seq, ",umask=%03o", sbi->umask);
673 if (sbi->flag & JFS_NOINTEGRITY)
674 seq_puts(seq, ",nointegrity");
675 if (sbi->flag & JFS_DISCARD)
676 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
677 if (sbi->nls_tab)
678 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
679 if (sbi->flag & JFS_ERR_CONTINUE)
680 seq_printf(seq, ",errors=continue");
681 if (sbi->flag & JFS_ERR_PANIC)
682 seq_printf(seq, ",errors=panic");
683
684#ifdef CONFIG_QUOTA
685 if (sbi->flag & JFS_USRQUOTA)
686 seq_puts(seq, ",usrquota");
687
688 if (sbi->flag & JFS_GRPQUOTA)
689 seq_puts(seq, ",grpquota");
690#endif
691
692 return 0;
693}
694
695#ifdef CONFIG_QUOTA
696
697
698
699
700
701static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
702 size_t len, loff_t off)
703{
704 struct inode *inode = sb_dqopt(sb)->files[type];
705 sector_t blk = off >> sb->s_blocksize_bits;
706 int err = 0;
707 int offset = off & (sb->s_blocksize - 1);
708 int tocopy;
709 size_t toread;
710 struct buffer_head tmp_bh;
711 struct buffer_head *bh;
712 loff_t i_size = i_size_read(inode);
713
714 if (off > i_size)
715 return 0;
716 if (off+len > i_size)
717 len = i_size-off;
718 toread = len;
719 while (toread > 0) {
720 tocopy = sb->s_blocksize - offset < toread ?
721 sb->s_blocksize - offset : toread;
722
723 tmp_bh.b_state = 0;
724 tmp_bh.b_size = 1 << inode->i_blkbits;
725 err = jfs_get_block(inode, blk, &tmp_bh, 0);
726 if (err)
727 return err;
728 if (!buffer_mapped(&tmp_bh))
729 memset(data, 0, tocopy);
730 else {
731 bh = sb_bread(sb, tmp_bh.b_blocknr);
732 if (!bh)
733 return -EIO;
734 memcpy(data, bh->b_data+offset, tocopy);
735 brelse(bh);
736 }
737 offset = 0;
738 toread -= tocopy;
739 data += tocopy;
740 blk++;
741 }
742 return len;
743}
744
745
746static ssize_t jfs_quota_write(struct super_block *sb, int type,
747 const char *data, size_t len, loff_t off)
748{
749 struct inode *inode = sb_dqopt(sb)->files[type];
750 sector_t blk = off >> sb->s_blocksize_bits;
751 int err = 0;
752 int offset = off & (sb->s_blocksize - 1);
753 int tocopy;
754 size_t towrite = len;
755 struct buffer_head tmp_bh;
756 struct buffer_head *bh;
757
758 mutex_lock(&inode->i_mutex);
759 while (towrite > 0) {
760 tocopy = sb->s_blocksize - offset < towrite ?
761 sb->s_blocksize - offset : towrite;
762
763 tmp_bh.b_state = 0;
764 tmp_bh.b_size = 1 << inode->i_blkbits;
765 err = jfs_get_block(inode, blk, &tmp_bh, 1);
766 if (err)
767 goto out;
768 if (offset || tocopy != sb->s_blocksize)
769 bh = sb_bread(sb, tmp_bh.b_blocknr);
770 else
771 bh = sb_getblk(sb, tmp_bh.b_blocknr);
772 if (!bh) {
773 err = -EIO;
774 goto out;
775 }
776 lock_buffer(bh);
777 memcpy(bh->b_data+offset, data, tocopy);
778 flush_dcache_page(bh->b_page);
779 set_buffer_uptodate(bh);
780 mark_buffer_dirty(bh);
781 unlock_buffer(bh);
782 brelse(bh);
783 offset = 0;
784 towrite -= tocopy;
785 data += tocopy;
786 blk++;
787 }
788out:
789 if (len == towrite) {
790 mutex_unlock(&inode->i_mutex);
791 return err;
792 }
793 if (inode->i_size < off+len-towrite)
794 i_size_write(inode, off+len-towrite);
795 inode->i_version++;
796 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
797 mark_inode_dirty(inode);
798 mutex_unlock(&inode->i_mutex);
799 return len - towrite;
800}
801
802#endif
803
804static const struct super_operations jfs_super_operations = {
805 .alloc_inode = jfs_alloc_inode,
806 .destroy_inode = jfs_destroy_inode,
807 .dirty_inode = jfs_dirty_inode,
808 .write_inode = jfs_write_inode,
809 .evict_inode = jfs_evict_inode,
810 .put_super = jfs_put_super,
811 .sync_fs = jfs_sync_fs,
812 .freeze_fs = jfs_freeze,
813 .unfreeze_fs = jfs_unfreeze,
814 .statfs = jfs_statfs,
815 .remount_fs = jfs_remount,
816 .show_options = jfs_show_options,
817#ifdef CONFIG_QUOTA
818 .quota_read = jfs_quota_read,
819 .quota_write = jfs_quota_write,
820#endif
821};
822
823static const struct export_operations jfs_export_operations = {
824 .fh_to_dentry = jfs_fh_to_dentry,
825 .fh_to_parent = jfs_fh_to_parent,
826 .get_parent = jfs_get_parent,
827};
828
829static struct file_system_type jfs_fs_type = {
830 .owner = THIS_MODULE,
831 .name = "jfs",
832 .mount = jfs_do_mount,
833 .kill_sb = kill_block_super,
834 .fs_flags = FS_REQUIRES_DEV,
835};
836MODULE_ALIAS_FS("jfs");
837
838static void init_once(void *foo)
839{
840 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
841
842 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
843 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
844 init_rwsem(&jfs_ip->rdwrlock);
845 mutex_init(&jfs_ip->commit_mutex);
846 init_rwsem(&jfs_ip->xattr_sem);
847 spin_lock_init(&jfs_ip->ag_lock);
848 jfs_ip->active_ag = -1;
849 inode_init_once(&jfs_ip->vfs_inode);
850}
851
852static int __init init_jfs_fs(void)
853{
854 int i;
855 int rc;
856
857 jfs_inode_cachep =
858 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
859 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
860 init_once);
861 if (jfs_inode_cachep == NULL)
862 return -ENOMEM;
863
864
865
866
867 rc = metapage_init();
868 if (rc) {
869 jfs_err("metapage_init failed w/rc = %d", rc);
870 goto free_slab;
871 }
872
873
874
875
876 rc = txInit();
877 if (rc) {
878 jfs_err("txInit failed w/rc = %d", rc);
879 goto free_metapage;
880 }
881
882
883
884
885 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
886 if (IS_ERR(jfsIOthread)) {
887 rc = PTR_ERR(jfsIOthread);
888 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
889 goto end_txmngr;
890 }
891
892 if (commit_threads < 1)
893 commit_threads = num_online_cpus();
894 if (commit_threads > MAX_COMMIT_THREADS)
895 commit_threads = MAX_COMMIT_THREADS;
896
897 for (i = 0; i < commit_threads; i++) {
898 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
899 if (IS_ERR(jfsCommitThread[i])) {
900 rc = PTR_ERR(jfsCommitThread[i]);
901 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
902 commit_threads = i;
903 goto kill_committask;
904 }
905 }
906
907 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
908 if (IS_ERR(jfsSyncThread)) {
909 rc = PTR_ERR(jfsSyncThread);
910 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
911 goto kill_committask;
912 }
913
914#ifdef PROC_FS_JFS
915 jfs_proc_init();
916#endif
917
918 rc = register_filesystem(&jfs_fs_type);
919 if (!rc)
920 return 0;
921
922#ifdef PROC_FS_JFS
923 jfs_proc_clean();
924#endif
925 kthread_stop(jfsSyncThread);
926kill_committask:
927 for (i = 0; i < commit_threads; i++)
928 kthread_stop(jfsCommitThread[i]);
929 kthread_stop(jfsIOthread);
930end_txmngr:
931 txExit();
932free_metapage:
933 metapage_exit();
934free_slab:
935 kmem_cache_destroy(jfs_inode_cachep);
936 return rc;
937}
938
939static void __exit exit_jfs_fs(void)
940{
941 int i;
942
943 jfs_info("exit_jfs_fs called");
944
945 txExit();
946 metapage_exit();
947
948 kthread_stop(jfsIOthread);
949 for (i = 0; i < commit_threads; i++)
950 kthread_stop(jfsCommitThread[i]);
951 kthread_stop(jfsSyncThread);
952#ifdef PROC_FS_JFS
953 jfs_proc_clean();
954#endif
955 unregister_filesystem(&jfs_fs_type);
956
957
958
959
960
961 rcu_barrier();
962 kmem_cache_destroy(jfs_inode_cachep);
963}
964
965module_init(init_jfs_fs)
966module_exit(exit_jfs_fs)
967
