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7#include <linux/fs.h>
8#include <linux/module.h>
9#include <linux/parser.h>
10#include <linux/completion.h>
11#include <linux/vfs.h>
12#include <linux/quotaops.h>
13#include <linux/mount.h>
14#include <linux/moduleparam.h>
15#include <linux/kthread.h>
16#include <linux/posix_acl.h>
17#include <linux/buffer_head.h>
18#include <linux/exportfs.h>
19#include <linux/crc32.h>
20#include <linux/slab.h>
21#include <linux/uaccess.h>
22#include <linux/seq_file.h>
23#include <linux/blkdev.h>
24
25#include "jfs_incore.h"
26#include "jfs_filsys.h"
27#include "jfs_inode.h"
28#include "jfs_metapage.h"
29#include "jfs_superblock.h"
30#include "jfs_dmap.h"
31#include "jfs_imap.h"
32#include "jfs_acl.h"
33#include "jfs_debug.h"
34#include "jfs_xattr.h"
35#include "jfs_dinode.h"
36
37MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
38MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
39MODULE_LICENSE("GPL");
40
41static struct kmem_cache *jfs_inode_cachep;
42
43static const struct super_operations jfs_super_operations;
44static const struct export_operations jfs_export_operations;
45static struct file_system_type jfs_fs_type;
46
47#define MAX_COMMIT_THREADS 64
48static int commit_threads;
49module_param(commit_threads, int, 0);
50MODULE_PARM_DESC(commit_threads, "Number of commit threads");
51
52static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
53struct task_struct *jfsIOthread;
54struct task_struct *jfsSyncThread;
55
56#ifdef CONFIG_JFS_DEBUG
57int jfsloglevel = JFS_LOGLEVEL_WARN;
58module_param(jfsloglevel, int, 0644);
59MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
60#endif
61
62static void jfs_handle_error(struct super_block *sb)
63{
64 struct jfs_sb_info *sbi = JFS_SBI(sb);
65
66 if (sb_rdonly(sb))
67 return;
68
69 updateSuper(sb, FM_DIRTY);
70
71 if (sbi->flag & JFS_ERR_PANIC)
72 panic("JFS (device %s): panic forced after error\n",
73 sb->s_id);
74 else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
75 jfs_err("ERROR: (device %s): remounting filesystem as read-only",
76 sb->s_id);
77 sb->s_flags |= SB_RDONLY;
78 }
79
80
81}
82
83void jfs_error(struct super_block *sb, const char *fmt, ...)
84{
85 struct va_format vaf;
86 va_list args;
87
88 va_start(args, fmt);
89
90 vaf.fmt = fmt;
91 vaf.va = &args;
92
93 pr_err("ERROR: (device %s): %ps: %pV\n",
94 sb->s_id, __builtin_return_address(0), &vaf);
95
96 va_end(args);
97
98 jfs_handle_error(sb);
99}
100
101static struct inode *jfs_alloc_inode(struct super_block *sb)
102{
103 struct jfs_inode_info *jfs_inode;
104
105 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
106 if (!jfs_inode)
107 return NULL;
108#ifdef CONFIG_QUOTA
109 memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot));
110#endif
111 return &jfs_inode->vfs_inode;
112}
113
114static void jfs_free_inode(struct inode *inode)
115{
116 kmem_cache_free(jfs_inode_cachep, JFS_IP(inode));
117}
118
119static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
120{
121 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
122 s64 maxinodes;
123 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
124
125 jfs_info("In jfs_statfs");
126 buf->f_type = JFS_SUPER_MAGIC;
127 buf->f_bsize = sbi->bsize;
128 buf->f_blocks = sbi->bmap->db_mapsize;
129 buf->f_bfree = sbi->bmap->db_nfree;
130 buf->f_bavail = sbi->bmap->db_nfree;
131
132
133
134
135
136
137
138
139
140 maxinodes = min((s64) atomic_read(&imap->im_numinos) +
141 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
142 << L2INOSPEREXT), (s64) 0xffffffffLL);
143 buf->f_files = maxinodes;
144 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
145 atomic_read(&imap->im_numfree));
146 buf->f_fsid.val[0] = crc32_le(0, (char *)&sbi->uuid,
147 sizeof(sbi->uuid)/2);
148 buf->f_fsid.val[1] = crc32_le(0,
149 (char *)&sbi->uuid + sizeof(sbi->uuid)/2,
150 sizeof(sbi->uuid)/2);
151
152 buf->f_namelen = JFS_NAME_MAX;
153 return 0;
154}
155
156#ifdef CONFIG_QUOTA
157static int jfs_quota_off(struct super_block *sb, int type);
158static int jfs_quota_on(struct super_block *sb, int type, int format_id,
159 const struct path *path);
160
161static void jfs_quota_off_umount(struct super_block *sb)
162{
163 int type;
164
165 for (type = 0; type < MAXQUOTAS; type++)
166 jfs_quota_off(sb, type);
167}
168
169static const struct quotactl_ops jfs_quotactl_ops = {
170 .quota_on = jfs_quota_on,
171 .quota_off = jfs_quota_off,
172 .quota_sync = dquot_quota_sync,
173 .get_state = dquot_get_state,
174 .set_info = dquot_set_dqinfo,
175 .get_dqblk = dquot_get_dqblk,
176 .set_dqblk = dquot_set_dqblk,
177 .get_nextdqblk = dquot_get_next_dqblk,
178};
179#else
180static inline void jfs_quota_off_umount(struct super_block *sb)
181{
182}
183#endif
184
185static void jfs_put_super(struct super_block *sb)
186{
187 struct jfs_sb_info *sbi = JFS_SBI(sb);
188 int rc;
189
190 jfs_info("In jfs_put_super");
191
192 jfs_quota_off_umount(sb);
193
194 rc = jfs_umount(sb);
195 if (rc)
196 jfs_err("jfs_umount failed with return code %d", rc);
197
198 unload_nls(sbi->nls_tab);
199
200 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
201 iput(sbi->direct_inode);
202
203 kfree(sbi);
204}
205
206enum {
207 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
208 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
209 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask,
210 Opt_discard, Opt_nodiscard, Opt_discard_minblk
211};
212
213static const match_table_t tokens = {
214 {Opt_integrity, "integrity"},
215 {Opt_nointegrity, "nointegrity"},
216 {Opt_iocharset, "iocharset=%s"},
217 {Opt_resize, "resize=%u"},
218 {Opt_resize_nosize, "resize"},
219 {Opt_errors, "errors=%s"},
220 {Opt_ignore, "noquota"},
221 {Opt_quota, "quota"},
222 {Opt_usrquota, "usrquota"},
223 {Opt_grpquota, "grpquota"},
224 {Opt_uid, "uid=%u"},
225 {Opt_gid, "gid=%u"},
226 {Opt_umask, "umask=%u"},
227 {Opt_discard, "discard"},
228 {Opt_nodiscard, "nodiscard"},
229 {Opt_discard_minblk, "discard=%u"},
230 {Opt_err, NULL}
231};
232
233static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
234 int *flag)
235{
236 void *nls_map = (void *)-1;
237 char *p;
238 struct jfs_sb_info *sbi = JFS_SBI(sb);
239
240 *newLVSize = 0;
241
242 if (!options)
243 return 1;
244
245 while ((p = strsep(&options, ",")) != NULL) {
246 substring_t args[MAX_OPT_ARGS];
247 int token;
248 if (!*p)
249 continue;
250
251 token = match_token(p, tokens, args);
252 switch (token) {
253 case Opt_integrity:
254 *flag &= ~JFS_NOINTEGRITY;
255 break;
256 case Opt_nointegrity:
257 *flag |= JFS_NOINTEGRITY;
258 break;
259 case Opt_ignore:
260
261
262 break;
263 case Opt_iocharset:
264 if (nls_map && nls_map != (void *) -1)
265 unload_nls(nls_map);
266 if (!strcmp(args[0].from, "none"))
267 nls_map = NULL;
268 else {
269 nls_map = load_nls(args[0].from);
270 if (!nls_map) {
271 pr_err("JFS: charset not found\n");
272 goto cleanup;
273 }
274 }
275 break;
276 case Opt_resize:
277 {
278 char *resize = args[0].from;
279 int rc = kstrtoll(resize, 0, newLVSize);
280
281 if (rc)
282 goto cleanup;
283 break;
284 }
285 case Opt_resize_nosize:
286 {
287 *newLVSize = i_size_read(sb->s_bdev->bd_inode) >>
288 sb->s_blocksize_bits;
289 if (*newLVSize == 0)
290 pr_err("JFS: Cannot determine volume size\n");
291 break;
292 }
293 case Opt_errors:
294 {
295 char *errors = args[0].from;
296 if (!errors || !*errors)
297 goto cleanup;
298 if (!strcmp(errors, "continue")) {
299 *flag &= ~JFS_ERR_REMOUNT_RO;
300 *flag &= ~JFS_ERR_PANIC;
301 *flag |= JFS_ERR_CONTINUE;
302 } else if (!strcmp(errors, "remount-ro")) {
303 *flag &= ~JFS_ERR_CONTINUE;
304 *flag &= ~JFS_ERR_PANIC;
305 *flag |= JFS_ERR_REMOUNT_RO;
306 } else if (!strcmp(errors, "panic")) {
307 *flag &= ~JFS_ERR_CONTINUE;
308 *flag &= ~JFS_ERR_REMOUNT_RO;
309 *flag |= JFS_ERR_PANIC;
310 } else {
311 pr_err("JFS: %s is an invalid error handler\n",
312 errors);
313 goto cleanup;
314 }
315 break;
316 }
317
318#ifdef CONFIG_QUOTA
319 case Opt_quota:
320 case Opt_usrquota:
321 *flag |= JFS_USRQUOTA;
322 break;
323 case Opt_grpquota:
324 *flag |= JFS_GRPQUOTA;
325 break;
326#else
327 case Opt_usrquota:
328 case Opt_grpquota:
329 case Opt_quota:
330 pr_err("JFS: quota operations not supported\n");
331 break;
332#endif
333 case Opt_uid:
334 {
335 char *uid = args[0].from;
336 uid_t val;
337 int rc = kstrtouint(uid, 0, &val);
338
339 if (rc)
340 goto cleanup;
341 sbi->uid = make_kuid(current_user_ns(), val);
342 if (!uid_valid(sbi->uid))
343 goto cleanup;
344 break;
345 }
346
347 case Opt_gid:
348 {
349 char *gid = args[0].from;
350 gid_t val;
351 int rc = kstrtouint(gid, 0, &val);
352
353 if (rc)
354 goto cleanup;
355 sbi->gid = make_kgid(current_user_ns(), val);
356 if (!gid_valid(sbi->gid))
357 goto cleanup;
358 break;
359 }
360
361 case Opt_umask:
362 {
363 char *umask = args[0].from;
364 int rc = kstrtouint(umask, 8, &sbi->umask);
365
366 if (rc)
367 goto cleanup;
368 if (sbi->umask & ~0777) {
369 pr_err("JFS: Invalid value of umask\n");
370 goto cleanup;
371 }
372 break;
373 }
374
375 case Opt_discard:
376 {
377 struct request_queue *q = bdev_get_queue(sb->s_bdev);
378
379
380
381
382 sbi->minblks_trim = 64;
383 if (blk_queue_discard(q))
384 *flag |= JFS_DISCARD;
385 else
386 pr_err("JFS: discard option not supported on device\n");
387 break;
388 }
389
390 case Opt_nodiscard:
391 *flag &= ~JFS_DISCARD;
392 break;
393
394 case Opt_discard_minblk:
395 {
396 struct request_queue *q = bdev_get_queue(sb->s_bdev);
397 char *minblks_trim = args[0].from;
398 int rc;
399 if (blk_queue_discard(q)) {
400 *flag |= JFS_DISCARD;
401 rc = kstrtouint(minblks_trim, 0,
402 &sbi->minblks_trim);
403 if (rc)
404 goto cleanup;
405 } else
406 pr_err("JFS: discard option not supported on device\n");
407 break;
408 }
409
410 default:
411 printk("jfs: Unrecognized mount option \"%s\" or missing value\n",
412 p);
413 goto cleanup;
414 }
415 }
416
417 if (nls_map != (void *) -1) {
418
419 unload_nls(sbi->nls_tab);
420 sbi->nls_tab = nls_map;
421 }
422 return 1;
423
424cleanup:
425 if (nls_map && nls_map != (void *) -1)
426 unload_nls(nls_map);
427 return 0;
428}
429
430static int jfs_remount(struct super_block *sb, int *flags, char *data)
431{
432 s64 newLVSize = 0;
433 int rc = 0;
434 int flag = JFS_SBI(sb)->flag;
435 int ret;
436
437 sync_filesystem(sb);
438 if (!parse_options(data, sb, &newLVSize, &flag))
439 return -EINVAL;
440
441 if (newLVSize) {
442 if (sb_rdonly(sb)) {
443 pr_err("JFS: resize requires volume to be mounted read-write\n");
444 return -EROFS;
445 }
446 rc = jfs_extendfs(sb, newLVSize, 0);
447 if (rc)
448 return rc;
449 }
450
451 if (sb_rdonly(sb) && !(*flags & SB_RDONLY)) {
452
453
454
455
456 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
457
458 JFS_SBI(sb)->flag = flag;
459 ret = jfs_mount_rw(sb, 1);
460
461
462 sb->s_flags &= ~SB_RDONLY;
463
464 dquot_resume(sb, -1);
465 return ret;
466 }
467 if (!sb_rdonly(sb) && (*flags & SB_RDONLY)) {
468 rc = dquot_suspend(sb, -1);
469 if (rc < 0)
470 return rc;
471 rc = jfs_umount_rw(sb);
472 JFS_SBI(sb)->flag = flag;
473 return rc;
474 }
475 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
476 if (!sb_rdonly(sb)) {
477 rc = jfs_umount_rw(sb);
478 if (rc)
479 return rc;
480
481 JFS_SBI(sb)->flag = flag;
482 ret = jfs_mount_rw(sb, 1);
483 return ret;
484 }
485 JFS_SBI(sb)->flag = flag;
486
487 return 0;
488}
489
490static int jfs_fill_super(struct super_block *sb, void *data, int silent)
491{
492 struct jfs_sb_info *sbi;
493 struct inode *inode;
494 int rc;
495 s64 newLVSize = 0;
496 int flag, ret = -EINVAL;
497
498 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
499
500 sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL);
501 if (!sbi)
502 return -ENOMEM;
503
504 sb->s_fs_info = sbi;
505 sb->s_max_links = JFS_LINK_MAX;
506 sb->s_time_min = 0;
507 sb->s_time_max = U32_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 |= SB_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 = &jfs_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_size = i_size_read(sb->s_bdev->bd_inode);
555 inode->i_mapping->a_ops = &jfs_metapage_aops;
556 inode_fake_hash(inode);
557 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
558
559 sbi->direct_inode = inode;
560
561 rc = jfs_mount(sb);
562 if (rc) {
563 if (!silent)
564 jfs_err("jfs_mount failed w/return code = %d", rc);
565 goto out_mount_failed;
566 }
567 if (sb_rdonly(sb))
568 sbi->log = NULL;
569 else {
570 rc = jfs_mount_rw(sb, 0);
571 if (rc) {
572 if (!silent) {
573 jfs_err("jfs_mount_rw failed, return code = %d",
574 rc);
575 }
576 goto out_no_rw;
577 }
578 }
579
580 sb->s_magic = JFS_SUPER_MAGIC;
581
582 if (sbi->mntflag & JFS_OS2)
583 sb->s_d_op = &jfs_ci_dentry_operations;
584
585 inode = jfs_iget(sb, ROOT_I);
586 if (IS_ERR(inode)) {
587 ret = PTR_ERR(inode);
588 goto out_no_rw;
589 }
590 sb->s_root = d_make_root(inode);
591 if (!sb->s_root)
592 goto out_no_root;
593
594
595
596
597 sb->s_maxbytes = min(((loff_t)sb->s_blocksize) << 40, MAX_LFS_FILESIZE);
598 sb->s_time_gran = 1;
599 return 0;
600
601out_no_root:
602 jfs_err("jfs_read_super: get root dentry failed");
603
604out_no_rw:
605 rc = jfs_umount(sb);
606 if (rc)
607 jfs_err("jfs_umount failed with return code %d", rc);
608out_mount_failed:
609 filemap_write_and_wait(sbi->direct_inode->i_mapping);
610 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
611 make_bad_inode(sbi->direct_inode);
612 iput(sbi->direct_inode);
613 sbi->direct_inode = NULL;
614out_unload:
615 unload_nls(sbi->nls_tab);
616out_kfree:
617 kfree(sbi);
618 return ret;
619}
620
621static int jfs_freeze(struct super_block *sb)
622{
623 struct jfs_sb_info *sbi = JFS_SBI(sb);
624 struct jfs_log *log = sbi->log;
625 int rc = 0;
626
627 if (!sb_rdonly(sb)) {
628 txQuiesce(sb);
629 rc = lmLogShutdown(log);
630 if (rc) {
631 jfs_error(sb, "lmLogShutdown failed\n");
632
633
634 txResume(sb);
635
636 return rc;
637 }
638 rc = updateSuper(sb, FM_CLEAN);
639 if (rc) {
640 jfs_err("jfs_freeze: updateSuper failed");
641
642
643
644
645
646 }
647 }
648 return 0;
649}
650
651static int jfs_unfreeze(struct super_block *sb)
652{
653 struct jfs_sb_info *sbi = JFS_SBI(sb);
654 struct jfs_log *log = sbi->log;
655 int rc = 0;
656
657 if (!sb_rdonly(sb)) {
658 rc = updateSuper(sb, FM_MOUNT);
659 if (rc) {
660 jfs_error(sb, "updateSuper failed\n");
661 goto out;
662 }
663 rc = lmLogInit(log);
664 if (rc)
665 jfs_error(sb, "lmLogInit failed\n");
666out:
667 txResume(sb);
668 }
669 return rc;
670}
671
672static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
673 int flags, const char *dev_name, void *data)
674{
675 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
676}
677
678static int jfs_sync_fs(struct super_block *sb, int wait)
679{
680 struct jfs_log *log = JFS_SBI(sb)->log;
681
682
683 if (log) {
684
685
686
687
688 dquot_writeback_dquots(sb, -1);
689 jfs_flush_journal(log, wait);
690 jfs_syncpt(log, 0);
691 }
692
693 return 0;
694}
695
696static int jfs_show_options(struct seq_file *seq, struct dentry *root)
697{
698 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
699
700 if (uid_valid(sbi->uid))
701 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
702 if (gid_valid(sbi->gid))
703 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
704 if (sbi->umask != -1)
705 seq_printf(seq, ",umask=%03o", sbi->umask);
706 if (sbi->flag & JFS_NOINTEGRITY)
707 seq_puts(seq, ",nointegrity");
708 if (sbi->flag & JFS_DISCARD)
709 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
710 if (sbi->nls_tab)
711 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
712 if (sbi->flag & JFS_ERR_CONTINUE)
713 seq_printf(seq, ",errors=continue");
714 if (sbi->flag & JFS_ERR_PANIC)
715 seq_printf(seq, ",errors=panic");
716
717#ifdef CONFIG_QUOTA
718 if (sbi->flag & JFS_USRQUOTA)
719 seq_puts(seq, ",usrquota");
720
721 if (sbi->flag & JFS_GRPQUOTA)
722 seq_puts(seq, ",grpquota");
723#endif
724
725 return 0;
726}
727
728#ifdef CONFIG_QUOTA
729
730
731
732
733
734static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
735 size_t len, loff_t off)
736{
737 struct inode *inode = sb_dqopt(sb)->files[type];
738 sector_t blk = off >> sb->s_blocksize_bits;
739 int err = 0;
740 int offset = off & (sb->s_blocksize - 1);
741 int tocopy;
742 size_t toread;
743 struct buffer_head tmp_bh;
744 struct buffer_head *bh;
745 loff_t i_size = i_size_read(inode);
746
747 if (off > i_size)
748 return 0;
749 if (off+len > i_size)
750 len = i_size-off;
751 toread = len;
752 while (toread > 0) {
753 tocopy = sb->s_blocksize - offset < toread ?
754 sb->s_blocksize - offset : toread;
755
756 tmp_bh.b_state = 0;
757 tmp_bh.b_size = i_blocksize(inode);
758 err = jfs_get_block(inode, blk, &tmp_bh, 0);
759 if (err)
760 return err;
761 if (!buffer_mapped(&tmp_bh))
762 memset(data, 0, tocopy);
763 else {
764 bh = sb_bread(sb, tmp_bh.b_blocknr);
765 if (!bh)
766 return -EIO;
767 memcpy(data, bh->b_data+offset, tocopy);
768 brelse(bh);
769 }
770 offset = 0;
771 toread -= tocopy;
772 data += tocopy;
773 blk++;
774 }
775 return len;
776}
777
778
779static ssize_t jfs_quota_write(struct super_block *sb, int type,
780 const char *data, size_t len, loff_t off)
781{
782 struct inode *inode = sb_dqopt(sb)->files[type];
783 sector_t blk = off >> sb->s_blocksize_bits;
784 int err = 0;
785 int offset = off & (sb->s_blocksize - 1);
786 int tocopy;
787 size_t towrite = len;
788 struct buffer_head tmp_bh;
789 struct buffer_head *bh;
790
791 inode_lock(inode);
792 while (towrite > 0) {
793 tocopy = sb->s_blocksize - offset < towrite ?
794 sb->s_blocksize - offset : towrite;
795
796 tmp_bh.b_state = 0;
797 tmp_bh.b_size = i_blocksize(inode);
798 err = jfs_get_block(inode, blk, &tmp_bh, 1);
799 if (err)
800 goto out;
801 if (offset || tocopy != sb->s_blocksize)
802 bh = sb_bread(sb, tmp_bh.b_blocknr);
803 else
804 bh = sb_getblk(sb, tmp_bh.b_blocknr);
805 if (!bh) {
806 err = -EIO;
807 goto out;
808 }
809 lock_buffer(bh);
810 memcpy(bh->b_data+offset, data, tocopy);
811 flush_dcache_page(bh->b_page);
812 set_buffer_uptodate(bh);
813 mark_buffer_dirty(bh);
814 unlock_buffer(bh);
815 brelse(bh);
816 offset = 0;
817 towrite -= tocopy;
818 data += tocopy;
819 blk++;
820 }
821out:
822 if (len == towrite) {
823 inode_unlock(inode);
824 return err;
825 }
826 if (inode->i_size < off+len-towrite)
827 i_size_write(inode, off+len-towrite);
828 inode->i_mtime = inode->i_ctime = current_time(inode);
829 mark_inode_dirty(inode);
830 inode_unlock(inode);
831 return len - towrite;
832}
833
834static struct dquot **jfs_get_dquots(struct inode *inode)
835{
836 return JFS_IP(inode)->i_dquot;
837}
838
839static int jfs_quota_on(struct super_block *sb, int type, int format_id,
840 const struct path *path)
841{
842 int err;
843 struct inode *inode;
844
845 err = dquot_quota_on(sb, type, format_id, path);
846 if (err)
847 return err;
848
849 inode = d_inode(path->dentry);
850 inode_lock(inode);
851 JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL;
852 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
853 S_NOATIME | S_IMMUTABLE);
854 inode_unlock(inode);
855 mark_inode_dirty(inode);
856
857 return 0;
858}
859
860static int jfs_quota_off(struct super_block *sb, int type)
861{
862 struct inode *inode = sb_dqopt(sb)->files[type];
863 int err;
864
865 if (!inode || !igrab(inode))
866 goto out;
867
868 err = dquot_quota_off(sb, type);
869 if (err)
870 goto out_put;
871
872 inode_lock(inode);
873 JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL);
874 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
875 inode_unlock(inode);
876 mark_inode_dirty(inode);
877out_put:
878 iput(inode);
879 return err;
880out:
881 return dquot_quota_off(sb, type);
882}
883#endif
884
885static const struct super_operations jfs_super_operations = {
886 .alloc_inode = jfs_alloc_inode,
887 .free_inode = jfs_free_inode,
888 .dirty_inode = jfs_dirty_inode,
889 .write_inode = jfs_write_inode,
890 .evict_inode = jfs_evict_inode,
891 .put_super = jfs_put_super,
892 .sync_fs = jfs_sync_fs,
893 .freeze_fs = jfs_freeze,
894 .unfreeze_fs = jfs_unfreeze,
895 .statfs = jfs_statfs,
896 .remount_fs = jfs_remount,
897 .show_options = jfs_show_options,
898#ifdef CONFIG_QUOTA
899 .quota_read = jfs_quota_read,
900 .quota_write = jfs_quota_write,
901 .get_dquots = jfs_get_dquots,
902#endif
903};
904
905static const struct export_operations jfs_export_operations = {
906 .fh_to_dentry = jfs_fh_to_dentry,
907 .fh_to_parent = jfs_fh_to_parent,
908 .get_parent = jfs_get_parent,
909};
910
911static struct file_system_type jfs_fs_type = {
912 .owner = THIS_MODULE,
913 .name = "jfs",
914 .mount = jfs_do_mount,
915 .kill_sb = kill_block_super,
916 .fs_flags = FS_REQUIRES_DEV,
917};
918MODULE_ALIAS_FS("jfs");
919
920static void init_once(void *foo)
921{
922 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
923
924 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
925 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
926 init_rwsem(&jfs_ip->rdwrlock);
927 mutex_init(&jfs_ip->commit_mutex);
928 init_rwsem(&jfs_ip->xattr_sem);
929 spin_lock_init(&jfs_ip->ag_lock);
930 jfs_ip->active_ag = -1;
931 inode_init_once(&jfs_ip->vfs_inode);
932}
933
934static int __init init_jfs_fs(void)
935{
936 int i;
937 int rc;
938
939 jfs_inode_cachep =
940 kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info),
941 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
942 offsetof(struct jfs_inode_info, i_inline_all),
943 sizeof_field(struct jfs_inode_info, i_inline_all),
944 init_once);
945 if (jfs_inode_cachep == NULL)
946 return -ENOMEM;
947
948
949
950
951 rc = metapage_init();
952 if (rc) {
953 jfs_err("metapage_init failed w/rc = %d", rc);
954 goto free_slab;
955 }
956
957
958
959
960 rc = txInit();
961 if (rc) {
962 jfs_err("txInit failed w/rc = %d", rc);
963 goto free_metapage;
964 }
965
966
967
968
969 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
970 if (IS_ERR(jfsIOthread)) {
971 rc = PTR_ERR(jfsIOthread);
972 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
973 goto end_txmngr;
974 }
975
976 if (commit_threads < 1)
977 commit_threads = num_online_cpus();
978 if (commit_threads > MAX_COMMIT_THREADS)
979 commit_threads = MAX_COMMIT_THREADS;
980
981 for (i = 0; i < commit_threads; i++) {
982 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
983 "jfsCommit");
984 if (IS_ERR(jfsCommitThread[i])) {
985 rc = PTR_ERR(jfsCommitThread[i]);
986 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
987 commit_threads = i;
988 goto kill_committask;
989 }
990 }
991
992 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
993 if (IS_ERR(jfsSyncThread)) {
994 rc = PTR_ERR(jfsSyncThread);
995 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
996 goto kill_committask;
997 }
998
999#ifdef PROC_FS_JFS
1000 jfs_proc_init();
1001#endif
1002
1003 rc = register_filesystem(&jfs_fs_type);
1004 if (!rc)
1005 return 0;
1006
1007#ifdef PROC_FS_JFS
1008 jfs_proc_clean();
1009#endif
1010 kthread_stop(jfsSyncThread);
1011kill_committask:
1012 for (i = 0; i < commit_threads; i++)
1013 kthread_stop(jfsCommitThread[i]);
1014 kthread_stop(jfsIOthread);
1015end_txmngr:
1016 txExit();
1017free_metapage:
1018 metapage_exit();
1019free_slab:
1020 kmem_cache_destroy(jfs_inode_cachep);
1021 return rc;
1022}
1023
1024static void __exit exit_jfs_fs(void)
1025{
1026 int i;
1027
1028 jfs_info("exit_jfs_fs called");
1029
1030 txExit();
1031 metapage_exit();
1032
1033 kthread_stop(jfsIOthread);
1034 for (i = 0; i < commit_threads; i++)
1035 kthread_stop(jfsCommitThread[i]);
1036 kthread_stop(jfsSyncThread);
1037#ifdef PROC_FS_JFS
1038 jfs_proc_clean();
1039#endif
1040 unregister_filesystem(&jfs_fs_type);
1041
1042
1043
1044
1045
1046 rcu_barrier();
1047 kmem_cache_destroy(jfs_inode_cachep);
1048}
1049
1050module_init(init_jfs_fs)
1051module_exit(exit_jfs_fs)
1052
