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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#include "jfs_xattr.h"
48
49MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
50MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
51MODULE_LICENSE("GPL");
52
53static struct kmem_cache *jfs_inode_cachep;
54
55static const struct super_operations jfs_super_operations;
56static const struct export_operations jfs_export_operations;
57static struct file_system_type jfs_fs_type;
58
59#define MAX_COMMIT_THREADS 64
60static int commit_threads;
61module_param(commit_threads, int, 0);
62MODULE_PARM_DESC(commit_threads, "Number of commit threads");
63
64static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
65struct task_struct *jfsIOthread;
66struct task_struct *jfsSyncThread;
67
68#ifdef CONFIG_JFS_DEBUG
69int jfsloglevel = JFS_LOGLEVEL_WARN;
70module_param(jfsloglevel, int, 0644);
71MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
72#endif
73
74static 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\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 *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
113static 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
126static 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
133static 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
149static 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
163
164
165
166
167
168
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
184static 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
205enum {
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
212static 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
232static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
233 int *flag)
234{
235 void *nls_map = (void *)-1;
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
260
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
378
379
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
418 unload_nls(sbi->nls_tab);
419 sbi->nls_tab = nls_map;
420 }
421 return 1;
422
423cleanup:
424 if (nls_map && nls_map != (void *) -1)
425 unload_nls(nls_map);
426 return 0;
427}
428
429static 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
453
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
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
489static 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 if (!new_valid_dev(sb->s_bdev->bd_dev))
500 return -EOVERFLOW;
501
502 sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL);
503 if (!sbi)
504 return -ENOMEM;
505
506 sb->s_fs_info = sbi;
507 sb->s_max_links = JFS_LINK_MAX;
508 sbi->sb = sb;
509 sbi->uid = INVALID_UID;
510 sbi->gid = INVALID_GID;
511 sbi->umask = -1;
512
513
514 flag = JFS_ERR_REMOUNT_RO;
515
516 if (!parse_options((char *) data, sb, &newLVSize, &flag))
517 goto out_kfree;
518 sbi->flag = flag;
519
520#ifdef CONFIG_JFS_POSIX_ACL
521 sb->s_flags |= MS_POSIXACL;
522#endif
523
524 if (newLVSize) {
525 pr_err("resize option for remount only\n");
526 goto out_kfree;
527 }
528
529
530
531
532 sb_set_blocksize(sb, PSIZE);
533
534
535
536
537 sb->s_op = &jfs_super_operations;
538 sb->s_export_op = &jfs_export_operations;
539 sb->s_xattr = jfs_xattr_handlers;
540#ifdef CONFIG_QUOTA
541 sb->dq_op = &dquot_operations;
542 sb->s_qcop = &dquot_quotactl_ops;
543 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
544#endif
545
546
547
548
549 inode = new_inode(sb);
550 if (inode == NULL) {
551 ret = -ENOMEM;
552 goto out_unload;
553 }
554 inode->i_ino = 0;
555 inode->i_size = sb->s_bdev->bd_inode->i_size;
556 inode->i_mapping->a_ops = &jfs_metapage_aops;
557 hlist_add_fake(&inode->i_hash);
558 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
559
560 sbi->direct_inode = inode;
561
562 rc = jfs_mount(sb);
563 if (rc) {
564 if (!silent)
565 jfs_err("jfs_mount failed w/return code = %d", rc);
566 goto out_mount_failed;
567 }
568 if (sb->s_flags & MS_RDONLY)
569 sbi->log = NULL;
570 else {
571 rc = jfs_mount_rw(sb, 0);
572 if (rc) {
573 if (!silent) {
574 jfs_err("jfs_mount_rw failed, return code = %d",
575 rc);
576 }
577 goto out_no_rw;
578 }
579 }
580
581 sb->s_magic = JFS_SUPER_MAGIC;
582
583 if (sbi->mntflag & JFS_OS2)
584 sb->s_d_op = &jfs_ci_dentry_operations;
585
586 inode = jfs_iget(sb, ROOT_I);
587 if (IS_ERR(inode)) {
588 ret = PTR_ERR(inode);
589 goto out_no_rw;
590 }
591 sb->s_root = d_make_root(inode);
592 if (!sb->s_root)
593 goto out_no_root;
594
595
596 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
597#if BITS_PER_LONG == 32
598
599
600
601
602 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1,
603 (u64)sb->s_maxbytes);
604#endif
605 sb->s_time_gran = 1;
606 return 0;
607
608out_no_root:
609 jfs_err("jfs_read_super: get root dentry failed");
610
611out_no_rw:
612 rc = jfs_umount(sb);
613 if (rc)
614 jfs_err("jfs_umount failed with return code %d", rc);
615out_mount_failed:
616 filemap_write_and_wait(sbi->direct_inode->i_mapping);
617 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
618 make_bad_inode(sbi->direct_inode);
619 iput(sbi->direct_inode);
620 sbi->direct_inode = NULL;
621out_unload:
622 unload_nls(sbi->nls_tab);
623out_kfree:
624 kfree(sbi);
625 return ret;
626}
627
628static int jfs_freeze(struct super_block *sb)
629{
630 struct jfs_sb_info *sbi = JFS_SBI(sb);
631 struct jfs_log *log = sbi->log;
632 int rc = 0;
633
634 if (!(sb->s_flags & MS_RDONLY)) {
635 txQuiesce(sb);
636 rc = lmLogShutdown(log);
637 if (rc) {
638 jfs_error(sb, "lmLogShutdown failed\n");
639
640
641 txResume(sb);
642
643 return rc;
644 }
645 rc = updateSuper(sb, FM_CLEAN);
646 if (rc) {
647 jfs_err("jfs_freeze: updateSuper failed\n");
648
649
650
651
652
653 }
654 }
655 return 0;
656}
657
658static int jfs_unfreeze(struct super_block *sb)
659{
660 struct jfs_sb_info *sbi = JFS_SBI(sb);
661 struct jfs_log *log = sbi->log;
662 int rc = 0;
663
664 if (!(sb->s_flags & MS_RDONLY)) {
665 rc = updateSuper(sb, FM_MOUNT);
666 if (rc) {
667 jfs_error(sb, "updateSuper failed\n");
668 goto out;
669 }
670 rc = lmLogInit(log);
671 if (rc)
672 jfs_error(sb, "lmLogInit failed\n");
673out:
674 txResume(sb);
675 }
676 return rc;
677}
678
679static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
680 int flags, const char *dev_name, void *data)
681{
682 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
683}
684
685static int jfs_sync_fs(struct super_block *sb, int wait)
686{
687 struct jfs_log *log = JFS_SBI(sb)->log;
688
689
690 if (log) {
691
692
693
694
695 dquot_writeback_dquots(sb, -1);
696 jfs_flush_journal(log, wait);
697 jfs_syncpt(log, 0);
698 }
699
700 return 0;
701}
702
703static int jfs_show_options(struct seq_file *seq, struct dentry *root)
704{
705 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
706
707 if (uid_valid(sbi->uid))
708 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
709 if (gid_valid(sbi->gid))
710 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
711 if (sbi->umask != -1)
712 seq_printf(seq, ",umask=%03o", sbi->umask);
713 if (sbi->flag & JFS_NOINTEGRITY)
714 seq_puts(seq, ",nointegrity");
715 if (sbi->flag & JFS_DISCARD)
716 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
717 if (sbi->nls_tab)
718 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
719 if (sbi->flag & JFS_ERR_CONTINUE)
720 seq_printf(seq, ",errors=continue");
721 if (sbi->flag & JFS_ERR_PANIC)
722 seq_printf(seq, ",errors=panic");
723
724#ifdef CONFIG_QUOTA
725 if (sbi->flag & JFS_USRQUOTA)
726 seq_puts(seq, ",usrquota");
727
728 if (sbi->flag & JFS_GRPQUOTA)
729 seq_puts(seq, ",grpquota");
730#endif
731
732 return 0;
733}
734
735#ifdef CONFIG_QUOTA
736
737
738
739
740
741static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
742 size_t len, loff_t off)
743{
744 struct inode *inode = sb_dqopt(sb)->files[type];
745 sector_t blk = off >> sb->s_blocksize_bits;
746 int err = 0;
747 int offset = off & (sb->s_blocksize - 1);
748 int tocopy;
749 size_t toread;
750 struct buffer_head tmp_bh;
751 struct buffer_head *bh;
752 loff_t i_size = i_size_read(inode);
753
754 if (off > i_size)
755 return 0;
756 if (off+len > i_size)
757 len = i_size-off;
758 toread = len;
759 while (toread > 0) {
760 tocopy = sb->s_blocksize - offset < toread ?
761 sb->s_blocksize - offset : toread;
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, 0);
766 if (err)
767 return err;
768 if (!buffer_mapped(&tmp_bh))
769 memset(data, 0, tocopy);
770 else {
771 bh = sb_bread(sb, tmp_bh.b_blocknr);
772 if (!bh)
773 return -EIO;
774 memcpy(data, bh->b_data+offset, tocopy);
775 brelse(bh);
776 }
777 offset = 0;
778 toread -= tocopy;
779 data += tocopy;
780 blk++;
781 }
782 return len;
783}
784
785
786static ssize_t jfs_quota_write(struct super_block *sb, int type,
787 const char *data, size_t len, loff_t off)
788{
789 struct inode *inode = sb_dqopt(sb)->files[type];
790 sector_t blk = off >> sb->s_blocksize_bits;
791 int err = 0;
792 int offset = off & (sb->s_blocksize - 1);
793 int tocopy;
794 size_t towrite = len;
795 struct buffer_head tmp_bh;
796 struct buffer_head *bh;
797
798 mutex_lock(&inode->i_mutex);
799 while (towrite > 0) {
800 tocopy = sb->s_blocksize - offset < towrite ?
801 sb->s_blocksize - offset : towrite;
802
803 tmp_bh.b_state = 0;
804 tmp_bh.b_size = 1 << inode->i_blkbits;
805 err = jfs_get_block(inode, blk, &tmp_bh, 1);
806 if (err)
807 goto out;
808 if (offset || tocopy != sb->s_blocksize)
809 bh = sb_bread(sb, tmp_bh.b_blocknr);
810 else
811 bh = sb_getblk(sb, tmp_bh.b_blocknr);
812 if (!bh) {
813 err = -EIO;
814 goto out;
815 }
816 lock_buffer(bh);
817 memcpy(bh->b_data+offset, data, tocopy);
818 flush_dcache_page(bh->b_page);
819 set_buffer_uptodate(bh);
820 mark_buffer_dirty(bh);
821 unlock_buffer(bh);
822 brelse(bh);
823 offset = 0;
824 towrite -= tocopy;
825 data += tocopy;
826 blk++;
827 }
828out:
829 if (len == towrite) {
830 mutex_unlock(&inode->i_mutex);
831 return err;
832 }
833 if (inode->i_size < off+len-towrite)
834 i_size_write(inode, off+len-towrite);
835 inode->i_version++;
836 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
837 mark_inode_dirty(inode);
838 mutex_unlock(&inode->i_mutex);
839 return len - towrite;
840}
841
842static struct dquot **jfs_get_dquots(struct inode *inode)
843{
844 return JFS_IP(inode)->i_dquot;
845}
846#endif
847
848static const struct super_operations jfs_super_operations = {
849 .alloc_inode = jfs_alloc_inode,
850 .destroy_inode = jfs_destroy_inode,
851 .dirty_inode = jfs_dirty_inode,
852 .write_inode = jfs_write_inode,
853 .evict_inode = jfs_evict_inode,
854 .put_super = jfs_put_super,
855 .sync_fs = jfs_sync_fs,
856 .freeze_fs = jfs_freeze,
857 .unfreeze_fs = jfs_unfreeze,
858 .statfs = jfs_statfs,
859 .remount_fs = jfs_remount,
860 .show_options = jfs_show_options,
861#ifdef CONFIG_QUOTA
862 .quota_read = jfs_quota_read,
863 .quota_write = jfs_quota_write,
864 .get_dquots = jfs_get_dquots,
865#endif
866};
867
868static const struct export_operations jfs_export_operations = {
869 .fh_to_dentry = jfs_fh_to_dentry,
870 .fh_to_parent = jfs_fh_to_parent,
871 .get_parent = jfs_get_parent,
872};
873
874static struct file_system_type jfs_fs_type = {
875 .owner = THIS_MODULE,
876 .name = "jfs",
877 .mount = jfs_do_mount,
878 .kill_sb = kill_block_super,
879 .fs_flags = FS_REQUIRES_DEV,
880};
881MODULE_ALIAS_FS("jfs");
882
883static void init_once(void *foo)
884{
885 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
886
887 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
888 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
889 init_rwsem(&jfs_ip->rdwrlock);
890 mutex_init(&jfs_ip->commit_mutex);
891 init_rwsem(&jfs_ip->xattr_sem);
892 spin_lock_init(&jfs_ip->ag_lock);
893 jfs_ip->active_ag = -1;
894 inode_init_once(&jfs_ip->vfs_inode);
895}
896
897static int __init init_jfs_fs(void)
898{
899 int i;
900 int rc;
901
902 jfs_inode_cachep =
903 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
904 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
905 init_once);
906 if (jfs_inode_cachep == NULL)
907 return -ENOMEM;
908
909
910
911
912 rc = metapage_init();
913 if (rc) {
914 jfs_err("metapage_init failed w/rc = %d", rc);
915 goto free_slab;
916 }
917
918
919
920
921 rc = txInit();
922 if (rc) {
923 jfs_err("txInit failed w/rc = %d", rc);
924 goto free_metapage;
925 }
926
927
928
929
930 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
931 if (IS_ERR(jfsIOthread)) {
932 rc = PTR_ERR(jfsIOthread);
933 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
934 goto end_txmngr;
935 }
936
937 if (commit_threads < 1)
938 commit_threads = num_online_cpus();
939 if (commit_threads > MAX_COMMIT_THREADS)
940 commit_threads = MAX_COMMIT_THREADS;
941
942 for (i = 0; i < commit_threads; i++) {
943 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
944 "jfsCommit");
945 if (IS_ERR(jfsCommitThread[i])) {
946 rc = PTR_ERR(jfsCommitThread[i]);
947 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
948 commit_threads = i;
949 goto kill_committask;
950 }
951 }
952
953 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
954 if (IS_ERR(jfsSyncThread)) {
955 rc = PTR_ERR(jfsSyncThread);
956 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
957 goto kill_committask;
958 }
959
960#ifdef PROC_FS_JFS
961 jfs_proc_init();
962#endif
963
964 rc = register_filesystem(&jfs_fs_type);
965 if (!rc)
966 return 0;
967
968#ifdef PROC_FS_JFS
969 jfs_proc_clean();
970#endif
971 kthread_stop(jfsSyncThread);
972kill_committask:
973 for (i = 0; i < commit_threads; i++)
974 kthread_stop(jfsCommitThread[i]);
975 kthread_stop(jfsIOthread);
976end_txmngr:
977 txExit();
978free_metapage:
979 metapage_exit();
980free_slab:
981 kmem_cache_destroy(jfs_inode_cachep);
982 return rc;
983}
984
985static void __exit exit_jfs_fs(void)
986{
987 int i;
988
989 jfs_info("exit_jfs_fs called");
990
991 txExit();
992 metapage_exit();
993
994 kthread_stop(jfsIOthread);
995 for (i = 0; i < commit_threads; i++)
996 kthread_stop(jfsCommitThread[i]);
997 kthread_stop(jfsSyncThread);
998#ifdef PROC_FS_JFS
999 jfs_proc_clean();
1000#endif
1001 unregister_filesystem(&jfs_fs_type);
1002
1003
1004
1005
1006
1007 rcu_barrier();
1008 kmem_cache_destroy(jfs_inode_cachep);
1009}
1010
1011module_init(init_jfs_fs)
1012module_exit(exit_jfs_fs)
1013
