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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
[mirror_ubuntu-focal-kernel.git] / fs / jfs / super.c
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 = 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
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 = 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 /* if set to 1, even copying files will cause
379 * trimming :O
380 * -> user has more control over the online trimming
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 /* Discard old (if remount) */
419 unload_nls(sbi->nls_tab);
420 sbi->nls_tab = nls_map;
421 }
422 return 1;
423
424 cleanup:
425 if (nls_map && nls_map != (void *) -1)
426 unload_nls(nls_map);
427 return 0;
428 }
429
430 static 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 * Invalidate any previously read metadata. fsck may have
454 * changed the on-disk data since we mounted r/o
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 /* mark the fs r/w for quota activity */
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
490 static 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 sbi->sb = sb;
507 sbi->uid = INVALID_UID;
508 sbi->gid = INVALID_GID;
509 sbi->umask = -1;
510
511 /* initialize the mount flag and determine the default error handler */
512 flag = JFS_ERR_REMOUNT_RO;
513
514 if (!parse_options((char *) data, sb, &newLVSize, &flag))
515 goto out_kfree;
516 sbi->flag = flag;
517
518 #ifdef CONFIG_JFS_POSIX_ACL
519 sb->s_flags |= SB_POSIXACL;
520 #endif
521
522 if (newLVSize) {
523 pr_err("resize option for remount only\n");
524 goto out_kfree;
525 }
526
527 /*
528 * Initialize blocksize to 4K.
529 */
530 sb_set_blocksize(sb, PSIZE);
531
532 /*
533 * Set method vectors.
534 */
535 sb->s_op = &jfs_super_operations;
536 sb->s_export_op = &jfs_export_operations;
537 sb->s_xattr = jfs_xattr_handlers;
538 #ifdef CONFIG_QUOTA
539 sb->dq_op = &dquot_operations;
540 sb->s_qcop = &jfs_quotactl_ops;
541 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
542 #endif
543
544 /*
545 * Initialize direct-mapping inode/address-space
546 */
547 inode = new_inode(sb);
548 if (inode == NULL) {
549 ret = -ENOMEM;
550 goto out_unload;
551 }
552 inode->i_ino = 0;
553 inode->i_size = i_size_read(sb->s_bdev->bd_inode);
554 inode->i_mapping->a_ops = &jfs_metapage_aops;
555 inode_fake_hash(inode);
556 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
557
558 sbi->direct_inode = inode;
559
560 rc = jfs_mount(sb);
561 if (rc) {
562 if (!silent)
563 jfs_err("jfs_mount failed w/return code = %d", rc);
564 goto out_mount_failed;
565 }
566 if (sb_rdonly(sb))
567 sbi->log = NULL;
568 else {
569 rc = jfs_mount_rw(sb, 0);
570 if (rc) {
571 if (!silent) {
572 jfs_err("jfs_mount_rw failed, return code = %d",
573 rc);
574 }
575 goto out_no_rw;
576 }
577 }
578
579 sb->s_magic = JFS_SUPER_MAGIC;
580
581 if (sbi->mntflag & JFS_OS2)
582 sb->s_d_op = &jfs_ci_dentry_operations;
583
584 inode = jfs_iget(sb, ROOT_I);
585 if (IS_ERR(inode)) {
586 ret = PTR_ERR(inode);
587 goto out_no_rw;
588 }
589 sb->s_root = d_make_root(inode);
590 if (!sb->s_root)
591 goto out_no_root;
592
593 /* logical blocks are represented by 40 bits in pxd_t, etc.
594 * and page cache is indexed by long
595 */
596 sb->s_maxbytes = min(((loff_t)sb->s_blocksize) << 40, MAX_LFS_FILESIZE);
597 sb->s_time_gran = 1;
598 return 0;
599
600 out_no_root:
601 jfs_err("jfs_read_super: get root dentry failed");
602
603 out_no_rw:
604 rc = jfs_umount(sb);
605 if (rc)
606 jfs_err("jfs_umount failed with return code %d", rc);
607 out_mount_failed:
608 filemap_write_and_wait(sbi->direct_inode->i_mapping);
609 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
610 make_bad_inode(sbi->direct_inode);
611 iput(sbi->direct_inode);
612 sbi->direct_inode = NULL;
613 out_unload:
614 unload_nls(sbi->nls_tab);
615 out_kfree:
616 kfree(sbi);
617 return ret;
618 }
619
620 static int jfs_freeze(struct super_block *sb)
621 {
622 struct jfs_sb_info *sbi = JFS_SBI(sb);
623 struct jfs_log *log = sbi->log;
624 int rc = 0;
625
626 if (!sb_rdonly(sb)) {
627 txQuiesce(sb);
628 rc = lmLogShutdown(log);
629 if (rc) {
630 jfs_error(sb, "lmLogShutdown failed\n");
631
632 /* let operations fail rather than hang */
633 txResume(sb);
634
635 return rc;
636 }
637 rc = updateSuper(sb, FM_CLEAN);
638 if (rc) {
639 jfs_err("jfs_freeze: updateSuper failed");
640 /*
641 * Don't fail here. Everything succeeded except
642 * marking the superblock clean, so there's really
643 * no harm in leaving it frozen for now.
644 */
645 }
646 }
647 return 0;
648 }
649
650 static int jfs_unfreeze(struct super_block *sb)
651 {
652 struct jfs_sb_info *sbi = JFS_SBI(sb);
653 struct jfs_log *log = sbi->log;
654 int rc = 0;
655
656 if (!sb_rdonly(sb)) {
657 rc = updateSuper(sb, FM_MOUNT);
658 if (rc) {
659 jfs_error(sb, "updateSuper failed\n");
660 goto out;
661 }
662 rc = lmLogInit(log);
663 if (rc)
664 jfs_error(sb, "lmLogInit failed\n");
665 out:
666 txResume(sb);
667 }
668 return rc;
669 }
670
671 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
672 int flags, const char *dev_name, void *data)
673 {
674 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
675 }
676
677 static int jfs_sync_fs(struct super_block *sb, int wait)
678 {
679 struct jfs_log *log = JFS_SBI(sb)->log;
680
681 /* log == NULL indicates read-only mount */
682 if (log) {
683 /*
684 * Write quota structures to quota file, sync_blockdev() will
685 * write them to disk later
686 */
687 dquot_writeback_dquots(sb, -1);
688 jfs_flush_journal(log, wait);
689 jfs_syncpt(log, 0);
690 }
691
692 return 0;
693 }
694
695 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
696 {
697 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
698
699 if (uid_valid(sbi->uid))
700 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
701 if (gid_valid(sbi->gid))
702 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
703 if (sbi->umask != -1)
704 seq_printf(seq, ",umask=%03o", sbi->umask);
705 if (sbi->flag & JFS_NOINTEGRITY)
706 seq_puts(seq, ",nointegrity");
707 if (sbi->flag & JFS_DISCARD)
708 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
709 if (sbi->nls_tab)
710 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
711 if (sbi->flag & JFS_ERR_CONTINUE)
712 seq_printf(seq, ",errors=continue");
713 if (sbi->flag & JFS_ERR_PANIC)
714 seq_printf(seq, ",errors=panic");
715
716 #ifdef CONFIG_QUOTA
717 if (sbi->flag & JFS_USRQUOTA)
718 seq_puts(seq, ",usrquota");
719
720 if (sbi->flag & JFS_GRPQUOTA)
721 seq_puts(seq, ",grpquota");
722 #endif
723
724 return 0;
725 }
726
727 #ifdef CONFIG_QUOTA
728
729 /* Read data from quotafile - avoid pagecache and such because we cannot afford
730 * acquiring the locks... As quota files are never truncated and quota code
731 * itself serializes the operations (and no one else should touch the files)
732 * we don't have to be afraid of races */
733 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
734 size_t len, loff_t off)
735 {
736 struct inode *inode = sb_dqopt(sb)->files[type];
737 sector_t blk = off >> sb->s_blocksize_bits;
738 int err = 0;
739 int offset = off & (sb->s_blocksize - 1);
740 int tocopy;
741 size_t toread;
742 struct buffer_head tmp_bh;
743 struct buffer_head *bh;
744 loff_t i_size = i_size_read(inode);
745
746 if (off > i_size)
747 return 0;
748 if (off+len > i_size)
749 len = i_size-off;
750 toread = len;
751 while (toread > 0) {
752 tocopy = sb->s_blocksize - offset < toread ?
753 sb->s_blocksize - offset : toread;
754
755 tmp_bh.b_state = 0;
756 tmp_bh.b_size = i_blocksize(inode);
757 err = jfs_get_block(inode, blk, &tmp_bh, 0);
758 if (err)
759 return err;
760 if (!buffer_mapped(&tmp_bh)) /* A hole? */
761 memset(data, 0, tocopy);
762 else {
763 bh = sb_bread(sb, tmp_bh.b_blocknr);
764 if (!bh)
765 return -EIO;
766 memcpy(data, bh->b_data+offset, tocopy);
767 brelse(bh);
768 }
769 offset = 0;
770 toread -= tocopy;
771 data += tocopy;
772 blk++;
773 }
774 return len;
775 }
776
777 /* Write to quotafile */
778 static ssize_t jfs_quota_write(struct super_block *sb, int type,
779 const char *data, size_t len, loff_t off)
780 {
781 struct inode *inode = sb_dqopt(sb)->files[type];
782 sector_t blk = off >> sb->s_blocksize_bits;
783 int err = 0;
784 int offset = off & (sb->s_blocksize - 1);
785 int tocopy;
786 size_t towrite = len;
787 struct buffer_head tmp_bh;
788 struct buffer_head *bh;
789
790 inode_lock(inode);
791 while (towrite > 0) {
792 tocopy = sb->s_blocksize - offset < towrite ?
793 sb->s_blocksize - offset : towrite;
794
795 tmp_bh.b_state = 0;
796 tmp_bh.b_size = i_blocksize(inode);
797 err = jfs_get_block(inode, blk, &tmp_bh, 1);
798 if (err)
799 goto out;
800 if (offset || tocopy != sb->s_blocksize)
801 bh = sb_bread(sb, tmp_bh.b_blocknr);
802 else
803 bh = sb_getblk(sb, tmp_bh.b_blocknr);
804 if (!bh) {
805 err = -EIO;
806 goto out;
807 }
808 lock_buffer(bh);
809 memcpy(bh->b_data+offset, data, tocopy);
810 flush_dcache_page(bh->b_page);
811 set_buffer_uptodate(bh);
812 mark_buffer_dirty(bh);
813 unlock_buffer(bh);
814 brelse(bh);
815 offset = 0;
816 towrite -= tocopy;
817 data += tocopy;
818 blk++;
819 }
820 out:
821 if (len == towrite) {
822 inode_unlock(inode);
823 return err;
824 }
825 if (inode->i_size < off+len-towrite)
826 i_size_write(inode, off+len-towrite);
827 inode->i_mtime = inode->i_ctime = current_time(inode);
828 mark_inode_dirty(inode);
829 inode_unlock(inode);
830 return len - towrite;
831 }
832
833 static struct dquot **jfs_get_dquots(struct inode *inode)
834 {
835 return JFS_IP(inode)->i_dquot;
836 }
837
838 static int jfs_quota_on(struct super_block *sb, int type, int format_id,
839 const struct path *path)
840 {
841 int err;
842 struct inode *inode;
843
844 err = dquot_quota_on(sb, type, format_id, path);
845 if (err)
846 return err;
847
848 inode = d_inode(path->dentry);
849 inode_lock(inode);
850 JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL;
851 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
852 S_NOATIME | S_IMMUTABLE);
853 inode_unlock(inode);
854 mark_inode_dirty(inode);
855
856 return 0;
857 }
858
859 static int jfs_quota_off(struct super_block *sb, int type)
860 {
861 struct inode *inode = sb_dqopt(sb)->files[type];
862 int err;
863
864 if (!inode || !igrab(inode))
865 goto out;
866
867 err = dquot_quota_off(sb, type);
868 if (err)
869 goto out_put;
870
871 inode_lock(inode);
872 JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL);
873 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
874 inode_unlock(inode);
875 mark_inode_dirty(inode);
876 out_put:
877 iput(inode);
878 return err;
879 out:
880 return dquot_quota_off(sb, type);
881 }
882 #endif
883
884 static const struct super_operations jfs_super_operations = {
885 .alloc_inode = jfs_alloc_inode,
886 .free_inode = jfs_free_inode,
887 .dirty_inode = jfs_dirty_inode,
888 .write_inode = jfs_write_inode,
889 .evict_inode = jfs_evict_inode,
890 .put_super = jfs_put_super,
891 .sync_fs = jfs_sync_fs,
892 .freeze_fs = jfs_freeze,
893 .unfreeze_fs = jfs_unfreeze,
894 .statfs = jfs_statfs,
895 .remount_fs = jfs_remount,
896 .show_options = jfs_show_options,
897 #ifdef CONFIG_QUOTA
898 .quota_read = jfs_quota_read,
899 .quota_write = jfs_quota_write,
900 .get_dquots = jfs_get_dquots,
901 #endif
902 };
903
904 static const struct export_operations jfs_export_operations = {
905 .fh_to_dentry = jfs_fh_to_dentry,
906 .fh_to_parent = jfs_fh_to_parent,
907 .get_parent = jfs_get_parent,
908 };
909
910 static struct file_system_type jfs_fs_type = {
911 .owner = THIS_MODULE,
912 .name = "jfs",
913 .mount = jfs_do_mount,
914 .kill_sb = kill_block_super,
915 .fs_flags = FS_REQUIRES_DEV,
916 };
917 MODULE_ALIAS_FS("jfs");
918
919 static void init_once(void *foo)
920 {
921 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
922
923 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
924 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
925 init_rwsem(&jfs_ip->rdwrlock);
926 mutex_init(&jfs_ip->commit_mutex);
927 init_rwsem(&jfs_ip->xattr_sem);
928 spin_lock_init(&jfs_ip->ag_lock);
929 jfs_ip->active_ag = -1;
930 inode_init_once(&jfs_ip->vfs_inode);
931 }
932
933 static int __init init_jfs_fs(void)
934 {
935 int i;
936 int rc;
937
938 jfs_inode_cachep =
939 kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info),
940 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
941 offsetof(struct jfs_inode_info, i_inline), IDATASIZE,
942 init_once);
943 if (jfs_inode_cachep == NULL)
944 return -ENOMEM;
945
946 /*
947 * Metapage initialization
948 */
949 rc = metapage_init();
950 if (rc) {
951 jfs_err("metapage_init failed w/rc = %d", rc);
952 goto free_slab;
953 }
954
955 /*
956 * Transaction Manager initialization
957 */
958 rc = txInit();
959 if (rc) {
960 jfs_err("txInit failed w/rc = %d", rc);
961 goto free_metapage;
962 }
963
964 /*
965 * I/O completion thread (endio)
966 */
967 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
968 if (IS_ERR(jfsIOthread)) {
969 rc = PTR_ERR(jfsIOthread);
970 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
971 goto end_txmngr;
972 }
973
974 if (commit_threads < 1)
975 commit_threads = num_online_cpus();
976 if (commit_threads > MAX_COMMIT_THREADS)
977 commit_threads = MAX_COMMIT_THREADS;
978
979 for (i = 0; i < commit_threads; i++) {
980 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
981 "jfsCommit");
982 if (IS_ERR(jfsCommitThread[i])) {
983 rc = PTR_ERR(jfsCommitThread[i]);
984 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
985 commit_threads = i;
986 goto kill_committask;
987 }
988 }
989
990 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
991 if (IS_ERR(jfsSyncThread)) {
992 rc = PTR_ERR(jfsSyncThread);
993 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
994 goto kill_committask;
995 }
996
997 #ifdef PROC_FS_JFS
998 jfs_proc_init();
999 #endif
1000
1001 rc = register_filesystem(&jfs_fs_type);
1002 if (!rc)
1003 return 0;
1004
1005 #ifdef PROC_FS_JFS
1006 jfs_proc_clean();
1007 #endif
1008 kthread_stop(jfsSyncThread);
1009 kill_committask:
1010 for (i = 0; i < commit_threads; i++)
1011 kthread_stop(jfsCommitThread[i]);
1012 kthread_stop(jfsIOthread);
1013 end_txmngr:
1014 txExit();
1015 free_metapage:
1016 metapage_exit();
1017 free_slab:
1018 kmem_cache_destroy(jfs_inode_cachep);
1019 return rc;
1020 }
1021
1022 static void __exit exit_jfs_fs(void)
1023 {
1024 int i;
1025
1026 jfs_info("exit_jfs_fs called");
1027
1028 txExit();
1029 metapage_exit();
1030
1031 kthread_stop(jfsIOthread);
1032 for (i = 0; i < commit_threads; i++)
1033 kthread_stop(jfsCommitThread[i]);
1034 kthread_stop(jfsSyncThread);
1035 #ifdef PROC_FS_JFS
1036 jfs_proc_clean();
1037 #endif
1038 unregister_filesystem(&jfs_fs_type);
1039
1040 /*
1041 * Make sure all delayed rcu free inodes are flushed before we
1042 * destroy cache.
1043 */
1044 rcu_barrier();
1045 kmem_cache_destroy(jfs_inode_cachep);
1046 }
1047
1048 module_init(init_jfs_fs)
1049 module_exit(exit_jfs_fs)
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