1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) International Business Machines Corp., 2000-2004
4 * Portions Copyright (C) Christoph Hellwig, 2001-2002
5 */
6
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
37 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
38 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
39 MODULE_LICENSE("GPL");
40
41 static struct kmem_cache *jfs_inode_cachep;
42
43 static const struct super_operations jfs_super_operations;
44 static const struct export_operations jfs_export_operations;
45 static struct file_system_type jfs_fs_type;
46
47 #define MAX_COMMIT_THREADS 64
48 static int commit_threads;
49 module_param(commit_threads, int, 0);
50 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
51
52 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
53 struct task_struct *jfsIOthread;
54 struct task_struct *jfsSyncThread;
55
56 #ifdef CONFIG_JFS_DEBUG
57 int jfsloglevel = JFS_LOGLEVEL_WARN;
58 module_param(jfsloglevel, int, 0644);
59 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
60 #endif
61
62 static 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 /* nothing is done for continue beyond marking the superblock dirty */
81 }
82
83 void 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
101 static struct inode *jfs_alloc_inode(struct super_block *sb)
102 {
103 struct jfs_inode_info *jfs_inode;
104
105 jfs_inode = alloc_inode_sb(sb, 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
114 static void jfs_free_inode(struct inode *inode)
115 {
116 kmem_cache_free(jfs_inode_cachep, JFS_IP(inode));
117 }
118
119 static 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 * If we really return the number of allocated & free inodes, some
133 * applications will fail because they won't see enough free inodes.
134 * We'll try to calculate some guess as to how many inodes we can
135 * really allocate
136 *
137 * buf->f_files = atomic_read(&imap->im_numinos);
138 * buf->f_ffree = atomic_read(&imap->im_numfree);
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
157 static int jfs_quota_off(struct super_block *sb, int type);
158 static int jfs_quota_on(struct super_block *sb, int type, int format_id,
159 const struct path *path);
160
161 static 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
169 static 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
180 static inline void jfs_quota_off_umount(struct super_block *sb)
181 {
182 }
183 #endif
184
185 static 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
206 enum {
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
213 static 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
233 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
234 int *flag)
235 {
236 void *nls_map = (void *)-1; /* -1: no change; NULL: none */
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 /* Silently ignore the quota options */
261 /* Don't do anything ;-) */
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 = sb_bdev_nr_blocks(sb);
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 /* if set to 1, even copying files will cause
376 * trimming :O
377 * -> user has more control over the online trimming
378 */
379 sbi->minblks_trim = 64;
380 if (bdev_max_discard_sectors(sb->s_bdev))
381 *flag |= JFS_DISCARD;
382 else
383 pr_err("JFS: discard option not supported on device\n");
384 break;
385
386 case Opt_nodiscard:
387 *flag &= ~JFS_DISCARD;
388 break;
389
390 case Opt_discard_minblk:
391 {
392 char *minblks_trim = args[0].from;
393 int rc;
394 if (bdev_max_discard_sectors(sb->s_bdev)) {
395 *flag |= JFS_DISCARD;
396 rc = kstrtouint(minblks_trim, 0,
397 &sbi->minblks_trim);
398 if (rc)
399 goto cleanup;
400 } else
401 pr_err("JFS: discard option not supported on device\n");
402 break;
403 }
404
405 default:
406 printk("jfs: Unrecognized mount option \"%s\" or missing value\n",
407 p);
408 goto cleanup;
409 }
410 }
411
412 if (nls_map != (void *) -1) {
413 /* Discard old (if remount) */
414 unload_nls(sbi->nls_tab);
415 sbi->nls_tab = nls_map;
416 }
417 return 1;
418
419 cleanup:
420 if (nls_map && nls_map != (void *) -1)
421 unload_nls(nls_map);
422 return 0;
423 }
424
425 static int jfs_remount(struct super_block *sb, int *flags, char *data)
426 {
427 s64 newLVSize = 0;
428 int rc = 0;
429 int flag = JFS_SBI(sb)->flag;
430 int ret;
431
432 sync_filesystem(sb);
433 if (!parse_options(data, sb, &newLVSize, &flag))
434 return -EINVAL;
435
436 if (newLVSize) {
437 if (sb_rdonly(sb)) {
438 pr_err("JFS: resize requires volume to be mounted read-write\n");
439 return -EROFS;
440 }
441 rc = jfs_extendfs(sb, newLVSize, 0);
442 if (rc)
443 return rc;
444 }
445
446 if (sb_rdonly(sb) && !(*flags & SB_RDONLY)) {
447 /*
448 * Invalidate any previously read metadata. fsck may have
449 * changed the on-disk data since we mounted r/o
450 */
451 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
452
453 JFS_SBI(sb)->flag = flag;
454 ret = jfs_mount_rw(sb, 1);
455
456 /* mark the fs r/w for quota activity */
457 sb->s_flags &= ~SB_RDONLY;
458
459 dquot_resume(sb, -1);
460 return ret;
461 }
462 if (!sb_rdonly(sb) && (*flags & SB_RDONLY)) {
463 rc = dquot_suspend(sb, -1);
464 if (rc < 0)
465 return rc;
466 rc = jfs_umount_rw(sb);
467 JFS_SBI(sb)->flag = flag;
468 return rc;
469 }
470 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
471 if (!sb_rdonly(sb)) {
472 rc = jfs_umount_rw(sb);
473 if (rc)
474 return rc;
475
476 JFS_SBI(sb)->flag = flag;
477 ret = jfs_mount_rw(sb, 1);
478 return ret;
479 }
480 JFS_SBI(sb)->flag = flag;
481
482 return 0;
483 }
484
485 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
486 {
487 struct jfs_sb_info *sbi;
488 struct inode *inode;
489 int rc;
490 s64 newLVSize = 0;
491 int flag, ret = -EINVAL;
492
493 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
494
495 sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL);
496 if (!sbi)
497 return -ENOMEM;
498
499 sb->s_fs_info = sbi;
500 sb->s_max_links = JFS_LINK_MAX;
501 sb->s_time_min = 0;
502 sb->s_time_max = U32_MAX;
503 sbi->sb = sb;
504 sbi->uid = INVALID_UID;
505 sbi->gid = INVALID_GID;
506 sbi->umask = -1;
507
508 /* initialize the mount flag and determine the default error handler */
509 flag = JFS_ERR_REMOUNT_RO;
510
511 if (!parse_options((char *) data, sb, &newLVSize, &flag))
512 goto out_kfree;
513 sbi->flag = flag;
514
515 #ifdef CONFIG_JFS_POSIX_ACL
516 sb->s_flags |= SB_POSIXACL;
517 #endif
518
519 if (newLVSize) {
520 pr_err("resize option for remount only\n");
521 goto out_kfree;
522 }
523
524 /*
525 * Initialize blocksize to 4K.
526 */
527 sb_set_blocksize(sb, PSIZE);
528
529 /*
530 * Set method vectors.
531 */
532 sb->s_op = &jfs_super_operations;
533 sb->s_export_op = &jfs_export_operations;
534 sb->s_xattr = jfs_xattr_handlers;
535 #ifdef CONFIG_QUOTA
536 sb->dq_op = &dquot_operations;
537 sb->s_qcop = &jfs_quotactl_ops;
538 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
539 #endif
540
541 /*
542 * Initialize direct-mapping inode/address-space
543 */
544 inode = new_inode(sb);
545 if (inode == NULL) {
546 ret = -ENOMEM;
547 goto out_unload;
548 }
549 inode->i_size = bdev_nr_bytes(sb->s_bdev);
550 inode->i_mapping->a_ops = &jfs_metapage_aops;
551 inode_fake_hash(inode);
552 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
553
554 sbi->direct_inode = inode;
555
556 rc = jfs_mount(sb);
557 if (rc) {
558 if (!silent)
559 jfs_err("jfs_mount failed w/return code = %d", rc);
560 goto out_mount_failed;
561 }
562 if (sb_rdonly(sb))
563 sbi->log = NULL;
564 else {
565 rc = jfs_mount_rw(sb, 0);
566 if (rc) {
567 if (!silent) {
568 jfs_err("jfs_mount_rw failed, return code = %d",
569 rc);
570 }
571 goto out_no_rw;
572 }
573 }
574
575 sb->s_magic = JFS_SUPER_MAGIC;
576
577 if (sbi->mntflag & JFS_OS2)
578 sb->s_d_op = &jfs_ci_dentry_operations;
579
580 inode = jfs_iget(sb, ROOT_I);
581 if (IS_ERR(inode)) {
582 ret = PTR_ERR(inode);
583 goto out_no_rw;
584 }
585 sb->s_root = d_make_root(inode);
586 if (!sb->s_root)
587 goto out_no_root;
588
589 /* logical blocks are represented by 40 bits in pxd_t, etc.
590 * and page cache is indexed by long
591 */
592 sb->s_maxbytes = min(((loff_t)sb->s_blocksize) << 40, MAX_LFS_FILESIZE);
593 sb->s_time_gran = 1;
594 return 0;
595
596 out_no_root:
597 jfs_err("jfs_read_super: get root dentry failed");
598
599 out_no_rw:
600 rc = jfs_umount(sb);
601 if (rc)
602 jfs_err("jfs_umount failed with return code %d", rc);
603 out_mount_failed:
604 filemap_write_and_wait(sbi->direct_inode->i_mapping);
605 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
606 make_bad_inode(sbi->direct_inode);
607 iput(sbi->direct_inode);
608 sbi->direct_inode = NULL;
609 out_unload:
610 unload_nls(sbi->nls_tab);
611 out_kfree:
612 kfree(sbi);
613 return ret;
614 }
615
616 static int jfs_freeze(struct super_block *sb)
617 {
618 struct jfs_sb_info *sbi = JFS_SBI(sb);
619 struct jfs_log *log = sbi->log;
620 int rc = 0;
621
622 if (!sb_rdonly(sb)) {
623 txQuiesce(sb);
624 rc = lmLogShutdown(log);
625 if (rc) {
626 jfs_error(sb, "lmLogShutdown failed\n");
627
628 /* let operations fail rather than hang */
629 txResume(sb);
630
631 return rc;
632 }
633 rc = updateSuper(sb, FM_CLEAN);
634 if (rc) {
635 jfs_err("jfs_freeze: updateSuper failed");
636 /*
637 * Don't fail here. Everything succeeded except
638 * marking the superblock clean, so there's really
639 * no harm in leaving it frozen for now.
640 */
641 }
642 }
643 return 0;
644 }
645
646 static int jfs_unfreeze(struct super_block *sb)
647 {
648 struct jfs_sb_info *sbi = JFS_SBI(sb);
649 struct jfs_log *log = sbi->log;
650 int rc = 0;
651
652 if (!sb_rdonly(sb)) {
653 rc = updateSuper(sb, FM_MOUNT);
654 if (rc) {
655 jfs_error(sb, "updateSuper failed\n");
656 goto out;
657 }
658 rc = lmLogInit(log);
659 if (rc)
660 jfs_error(sb, "lmLogInit failed\n");
661 out:
662 txResume(sb);
663 }
664 return rc;
665 }
666
667 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
668 int flags, const char *dev_name, void *data)
669 {
670 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
671 }
672
673 static int jfs_sync_fs(struct super_block *sb, int wait)
674 {
675 struct jfs_log *log = JFS_SBI(sb)->log;
676
677 /* log == NULL indicates read-only mount */
678 if (log) {
679 /*
680 * Write quota structures to quota file, sync_blockdev() will
681 * write them to disk later
682 */
683 dquot_writeback_dquots(sb, -1);
684 jfs_flush_journal(log, wait);
685 jfs_syncpt(log, 0);
686 }
687
688 return 0;
689 }
690
691 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
692 {
693 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
694
695 if (uid_valid(sbi->uid))
696 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
697 if (gid_valid(sbi->gid))
698 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
699 if (sbi->umask != -1)
700 seq_printf(seq, ",umask=%03o", sbi->umask);
701 if (sbi->flag & JFS_NOINTEGRITY)
702 seq_puts(seq, ",nointegrity");
703 if (sbi->flag & JFS_DISCARD)
704 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
705 if (sbi->nls_tab)
706 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
707 if (sbi->flag & JFS_ERR_CONTINUE)
708 seq_printf(seq, ",errors=continue");
709 if (sbi->flag & JFS_ERR_PANIC)
710 seq_printf(seq, ",errors=panic");
711
712 #ifdef CONFIG_QUOTA
713 if (sbi->flag & JFS_USRQUOTA)
714 seq_puts(seq, ",usrquota");
715
716 if (sbi->flag & JFS_GRPQUOTA)
717 seq_puts(seq, ",grpquota");
718 #endif
719
720 return 0;
721 }
722
723 #ifdef CONFIG_QUOTA
724
725 /* Read data from quotafile - avoid pagecache and such because we cannot afford
726 * acquiring the locks... As quota files are never truncated and quota code
727 * itself serializes the operations (and no one else should touch the files)
728 * we don't have to be afraid of races */
729 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
730 size_t len, loff_t off)
731 {
732 struct inode *inode = sb_dqopt(sb)->files[type];
733 sector_t blk = off >> sb->s_blocksize_bits;
734 int err = 0;
735 int offset = off & (sb->s_blocksize - 1);
736 int tocopy;
737 size_t toread;
738 struct buffer_head tmp_bh;
739 struct buffer_head *bh;
740 loff_t i_size = i_size_read(inode);
741
742 if (off > i_size)
743 return 0;
744 if (off+len > i_size)
745 len = i_size-off;
746 toread = len;
747 while (toread > 0) {
748 tocopy = min_t(size_t, sb->s_blocksize - offset, toread);
749
750 tmp_bh.b_state = 0;
751 tmp_bh.b_size = i_blocksize(inode);
752 err = jfs_get_block(inode, blk, &tmp_bh, 0);
753 if (err)
754 return err;
755 if (!buffer_mapped(&tmp_bh)) /* A hole? */
756 memset(data, 0, tocopy);
757 else {
758 bh = sb_bread(sb, tmp_bh.b_blocknr);
759 if (!bh)
760 return -EIO;
761 memcpy(data, bh->b_data+offset, tocopy);
762 brelse(bh);
763 }
764 offset = 0;
765 toread -= tocopy;
766 data += tocopy;
767 blk++;
768 }
769 return len;
770 }
771
772 /* Write to quotafile */
773 static ssize_t jfs_quota_write(struct super_block *sb, int type,
774 const char *data, size_t len, loff_t off)
775 {
776 struct inode *inode = sb_dqopt(sb)->files[type];
777 sector_t blk = off >> sb->s_blocksize_bits;
778 int err = 0;
779 int offset = off & (sb->s_blocksize - 1);
780 int tocopy;
781 size_t towrite = len;
782 struct buffer_head tmp_bh;
783 struct buffer_head *bh;
784
785 inode_lock(inode);
786 while (towrite > 0) {
787 tocopy = min_t(size_t, sb->s_blocksize - offset, towrite);
788
789 tmp_bh.b_state = 0;
790 tmp_bh.b_size = i_blocksize(inode);
791 err = jfs_get_block(inode, blk, &tmp_bh, 1);
792 if (err)
793 goto out;
794 if (offset || tocopy != sb->s_blocksize)
795 bh = sb_bread(sb, tmp_bh.b_blocknr);
796 else
797 bh = sb_getblk(sb, tmp_bh.b_blocknr);
798 if (!bh) {
799 err = -EIO;
800 goto out;
801 }
802 lock_buffer(bh);
803 memcpy(bh->b_data+offset, data, tocopy);
804 flush_dcache_page(bh->b_page);
805 set_buffer_uptodate(bh);
806 mark_buffer_dirty(bh);
807 unlock_buffer(bh);
808 brelse(bh);
809 offset = 0;
810 towrite -= tocopy;
811 data += tocopy;
812 blk++;
813 }
814 out:
815 if (len == towrite) {
816 inode_unlock(inode);
817 return err;
818 }
819 if (inode->i_size < off+len-towrite)
820 i_size_write(inode, off+len-towrite);
821 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
822 mark_inode_dirty(inode);
823 inode_unlock(inode);
824 return len - towrite;
825 }
826
827 static struct dquot __rcu **jfs_get_dquots(struct inode *inode)
828 {
829 return JFS_IP(inode)->i_dquot;
830 }
831
832 static int jfs_quota_on(struct super_block *sb, int type, int format_id,
833 const struct path *path)
834 {
835 int err;
836 struct inode *inode;
837
838 err = dquot_quota_on(sb, type, format_id, path);
839 if (err)
840 return err;
841
842 inode = d_inode(path->dentry);
843 inode_lock(inode);
844 JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL;
845 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
846 S_NOATIME | S_IMMUTABLE);
847 inode_unlock(inode);
848 mark_inode_dirty(inode);
849
850 return 0;
851 }
852
853 static int jfs_quota_off(struct super_block *sb, int type)
854 {
855 struct inode *inode = sb_dqopt(sb)->files[type];
856 int err;
857
858 if (!inode || !igrab(inode))
859 goto out;
860
861 err = dquot_quota_off(sb, type);
862 if (err)
863 goto out_put;
864
865 inode_lock(inode);
866 JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL);
867 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
868 inode_unlock(inode);
869 mark_inode_dirty(inode);
870 out_put:
871 iput(inode);
872 return err;
873 out:
874 return dquot_quota_off(sb, type);
875 }
876 #endif
877
878 static const struct super_operations jfs_super_operations = {
879 .alloc_inode = jfs_alloc_inode,
880 .free_inode = jfs_free_inode,
881 .dirty_inode = jfs_dirty_inode,
882 .write_inode = jfs_write_inode,
883 .evict_inode = jfs_evict_inode,
884 .put_super = jfs_put_super,
885 .sync_fs = jfs_sync_fs,
886 .freeze_fs = jfs_freeze,
887 .unfreeze_fs = jfs_unfreeze,
888 .statfs = jfs_statfs,
889 .remount_fs = jfs_remount,
890 .show_options = jfs_show_options,
891 #ifdef CONFIG_QUOTA
892 .quota_read = jfs_quota_read,
893 .quota_write = jfs_quota_write,
894 .get_dquots = jfs_get_dquots,
895 #endif
896 };
897
898 static const struct export_operations jfs_export_operations = {
899 .encode_fh = generic_encode_ino32_fh,
900 .fh_to_dentry = jfs_fh_to_dentry,
901 .fh_to_parent = jfs_fh_to_parent,
902 .get_parent = jfs_get_parent,
903 };
904
905 static struct file_system_type jfs_fs_type = {
906 .owner = THIS_MODULE,
907 .name = "jfs",
908 .mount = jfs_do_mount,
909 .kill_sb = kill_block_super,
910 .fs_flags = FS_REQUIRES_DEV,
911 };
912 MODULE_ALIAS_FS("jfs");
913
914 static void init_once(void *foo)
915 {
916 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
917
918 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
919 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
920 init_rwsem(&jfs_ip->rdwrlock);
921 mutex_init(&jfs_ip->commit_mutex);
922 init_rwsem(&jfs_ip->xattr_sem);
923 spin_lock_init(&jfs_ip->ag_lock);
924 jfs_ip->active_ag = -1;
925 inode_init_once(&jfs_ip->vfs_inode);
926 }
927
928 static int __init init_jfs_fs(void)
929 {
930 int i;
931 int rc;
932
933 jfs_inode_cachep =
934 kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info),
935 0, SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT,
936 offsetof(struct jfs_inode_info, i_inline_all),
937 sizeof_field(struct jfs_inode_info, i_inline_all),
938 init_once);
939 if (jfs_inode_cachep == NULL)
940 return -ENOMEM;
941
942 /*
943 * Metapage initialization
944 */
945 rc = metapage_init();
946 if (rc) {
947 jfs_err("metapage_init failed w/rc = %d", rc);
948 goto free_slab;
949 }
950
951 /*
952 * Transaction Manager initialization
953 */
954 rc = txInit();
955 if (rc) {
956 jfs_err("txInit failed w/rc = %d", rc);
957 goto free_metapage;
958 }
959
960 /*
961 * I/O completion thread (endio)
962 */
963 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
964 if (IS_ERR(jfsIOthread)) {
965 rc = PTR_ERR(jfsIOthread);
966 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
967 goto end_txmngr;
968 }
969
970 if (commit_threads < 1)
971 commit_threads = num_online_cpus();
972 if (commit_threads > MAX_COMMIT_THREADS)
973 commit_threads = MAX_COMMIT_THREADS;
974
975 for (i = 0; i < commit_threads; i++) {
976 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
977 "jfsCommit");
978 if (IS_ERR(jfsCommitThread[i])) {
979 rc = PTR_ERR(jfsCommitThread[i]);
980 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
981 commit_threads = i;
982 goto kill_committask;
983 }
984 }
985
986 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
987 if (IS_ERR(jfsSyncThread)) {
988 rc = PTR_ERR(jfsSyncThread);
989 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
990 goto kill_committask;
991 }
992
993 #ifdef PROC_FS_JFS
994 jfs_proc_init();
995 #endif
996
997 rc = register_filesystem(&jfs_fs_type);
998 if (!rc)
999 return 0;
1000
1001 #ifdef PROC_FS_JFS
1002 jfs_proc_clean();
1003 #endif
1004 kthread_stop(jfsSyncThread);
1005 kill_committask:
1006 for (i = 0; i < commit_threads; i++)
1007 kthread_stop(jfsCommitThread[i]);
1008 kthread_stop(jfsIOthread);
1009 end_txmngr:
1010 txExit();
1011 free_metapage:
1012 metapage_exit();
1013 free_slab:
1014 kmem_cache_destroy(jfs_inode_cachep);
1015 return rc;
1016 }
1017
1018 static void __exit exit_jfs_fs(void)
1019 {
1020 int i;
1021
1022 jfs_info("exit_jfs_fs called");
1023
1024 txExit();
1025 metapage_exit();
1026
1027 kthread_stop(jfsIOthread);
1028 for (i = 0; i < commit_threads; i++)
1029 kthread_stop(jfsCommitThread[i]);
1030 kthread_stop(jfsSyncThread);
1031 #ifdef PROC_FS_JFS
1032 jfs_proc_clean();
1033 #endif
1034 unregister_filesystem(&jfs_fs_type);
1035
1036 /*
1037 * Make sure all delayed rcu free inodes are flushed before we
1038 * destroy cache.
1039 */
1040 rcu_barrier();
1041 kmem_cache_destroy(jfs_inode_cachep);
1042 }
1043
1044 module_init(init_jfs_fs)
1045 module_exit(exit_jfs_fs)
1046
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