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Linux 5.8-rc4
[linux/fpc-iii.git] / fs / jfs / super.c
blobb2dc4d1f9dcc559117e0a5bcdd38676e873d3e53
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 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 /* initialize the mount flag and determine the default error handler */
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 * Initialize blocksize to 4K.
531 */
532 sb_set_blocksize(sb, PSIZE);
533
534 /*
535 * Set method vectors.
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 * Initialize direct-mapping inode/address-space
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 = i_size_read(sb->s_bdev->bd_inode);
556 inode->i_mapping->a_ops = &jfs_metapage_aops;
557 inode_fake_hash(inode);
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_rdonly(sb))
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 /* logical blocks are represented by 40 bits in pxd_t, etc.
596 * and page cache is indexed by long
597 */
598 sb->s_maxbytes = min(((loff_t)sb->s_blocksize) << 40, MAX_LFS_FILESIZE);
599 sb->s_time_gran = 1;
600 return 0;
601
602 out_no_root:
603 jfs_err("jfs_read_super: get root dentry failed");
604
605 out_no_rw:
606 rc = jfs_umount(sb);
607 if (rc)
608 jfs_err("jfs_umount failed with return code %d", rc);
609 out_mount_failed:
610 filemap_write_and_wait(sbi->direct_inode->i_mapping);
611 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
612 make_bad_inode(sbi->direct_inode);
613 iput(sbi->direct_inode);
614 sbi->direct_inode = NULL;
615 out_unload:
616 unload_nls(sbi->nls_tab);
617 out_kfree:
618 kfree(sbi);
619 return ret;
620 }
621
622 static int jfs_freeze(struct super_block *sb)
623 {
624 struct jfs_sb_info *sbi = JFS_SBI(sb);
625 struct jfs_log *log = sbi->log;
626 int rc = 0;
627
628 if (!sb_rdonly(sb)) {
629 txQuiesce(sb);
630 rc = lmLogShutdown(log);
631 if (rc) {
632 jfs_error(sb, "lmLogShutdown failed\n");
633
634 /* let operations fail rather than hang */
635 txResume(sb);
636
637 return rc;
638 }
639 rc = updateSuper(sb, FM_CLEAN);
640 if (rc) {
641 jfs_err("jfs_freeze: updateSuper failed");
642 /*
643 * Don't fail here. Everything succeeded except
644 * marking the superblock clean, so there's really
645 * no harm in leaving it frozen for now.
646 */
647 }
648 }
649 return 0;
650 }
651
652 static int jfs_unfreeze(struct super_block *sb)
653 {
654 struct jfs_sb_info *sbi = JFS_SBI(sb);
655 struct jfs_log *log = sbi->log;
656 int rc = 0;
657
658 if (!sb_rdonly(sb)) {
659 rc = updateSuper(sb, FM_MOUNT);
660 if (rc) {
661 jfs_error(sb, "updateSuper failed\n");
662 goto out;
663 }
664 rc = lmLogInit(log);
665 if (rc)
666 jfs_error(sb, "lmLogInit failed\n");
667 out:
668 txResume(sb);
669 }
670 return rc;
671 }
672
673 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
674 int flags, const char *dev_name, void *data)
675 {
676 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
677 }
678
679 static int jfs_sync_fs(struct super_block *sb, int wait)
680 {
681 struct jfs_log *log = JFS_SBI(sb)->log;
682
683 /* log == NULL indicates read-only mount */
684 if (log) {
685 /*
686 * Write quota structures to quota file, sync_blockdev() will
687 * write them to disk later
688 */
689 dquot_writeback_dquots(sb, -1);
690 jfs_flush_journal(log, wait);
691 jfs_syncpt(log, 0);
692 }
693
694 return 0;
695 }
696
697 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
698 {
699 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
700
701 if (uid_valid(sbi->uid))
702 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
703 if (gid_valid(sbi->gid))
704 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
705 if (sbi->umask != -1)
706 seq_printf(seq, ",umask=%03o", sbi->umask);
707 if (sbi->flag & JFS_NOINTEGRITY)
708 seq_puts(seq, ",nointegrity");
709 if (sbi->flag & JFS_DISCARD)
710 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
711 if (sbi->nls_tab)
712 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
713 if (sbi->flag & JFS_ERR_CONTINUE)
714 seq_printf(seq, ",errors=continue");
715 if (sbi->flag & JFS_ERR_PANIC)
716 seq_printf(seq, ",errors=panic");
717
718 #ifdef CONFIG_QUOTA
719 if (sbi->flag & JFS_USRQUOTA)
720 seq_puts(seq, ",usrquota");
721
722 if (sbi->flag & JFS_GRPQUOTA)
723 seq_puts(seq, ",grpquota");
724 #endif
725
726 return 0;
727 }
728
729 #ifdef CONFIG_QUOTA
730
731 /* Read data from quotafile - avoid pagecache and such because we cannot afford
732 * acquiring the locks... As quota files are never truncated and quota code
733 * itself serializes the operations (and no one else should touch the files)
734 * we don't have to be afraid of races */
735 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
736 size_t len, loff_t off)
737 {
738 struct inode *inode = sb_dqopt(sb)->files[type];
739 sector_t blk = off >> sb->s_blocksize_bits;
740 int err = 0;
741 int offset = off & (sb->s_blocksize - 1);
742 int tocopy;
743 size_t toread;
744 struct buffer_head tmp_bh;
745 struct buffer_head *bh;
746 loff_t i_size = i_size_read(inode);
747
748 if (off > i_size)
749 return 0;
750 if (off+len > i_size)
751 len = i_size-off;
752 toread = len;
753 while (toread > 0) {
754 tocopy = sb->s_blocksize - offset < toread ?
755 sb->s_blocksize - offset : toread;
756
757 tmp_bh.b_state = 0;
758 tmp_bh.b_size = i_blocksize(inode);
759 err = jfs_get_block(inode, blk, &tmp_bh, 0);
760 if (err)
761 return err;
762 if (!buffer_mapped(&tmp_bh)) /* A hole? */
763 memset(data, 0, tocopy);
764 else {
765 bh = sb_bread(sb, tmp_bh.b_blocknr);
766 if (!bh)
767 return -EIO;
768 memcpy(data, bh->b_data+offset, tocopy);
769 brelse(bh);
770 }
771 offset = 0;
772 toread -= tocopy;
773 data += tocopy;
774 blk++;
775 }
776 return len;
777 }
778
779 /* Write to quotafile */
780 static ssize_t jfs_quota_write(struct super_block *sb, int type,
781 const char *data, size_t len, loff_t off)
782 {
783 struct inode *inode = sb_dqopt(sb)->files[type];
784 sector_t blk = off >> sb->s_blocksize_bits;
785 int err = 0;
786 int offset = off & (sb->s_blocksize - 1);
787 int tocopy;
788 size_t towrite = len;
789 struct buffer_head tmp_bh;
790 struct buffer_head *bh;
791
792 inode_lock(inode);
793 while (towrite > 0) {
794 tocopy = sb->s_blocksize - offset < towrite ?
795 sb->s_blocksize - offset : towrite;
796
797 tmp_bh.b_state = 0;
798 tmp_bh.b_size = i_blocksize(inode);
799 err = jfs_get_block(inode, blk, &tmp_bh, 1);
800 if (err)
801 goto out;
802 if (offset || tocopy != sb->s_blocksize)
803 bh = sb_bread(sb, tmp_bh.b_blocknr);
804 else
805 bh = sb_getblk(sb, tmp_bh.b_blocknr);
806 if (!bh) {
807 err = -EIO;
808 goto out;
809 }
810 lock_buffer(bh);
811 memcpy(bh->b_data+offset, data, tocopy);
812 flush_dcache_page(bh->b_page);
813 set_buffer_uptodate(bh);
814 mark_buffer_dirty(bh);
815 unlock_buffer(bh);
816 brelse(bh);
817 offset = 0;
818 towrite -= tocopy;
819 data += tocopy;
820 blk++;
821 }
822 out:
823 if (len == towrite) {
824 inode_unlock(inode);
825 return err;
826 }
827 if (inode->i_size < off+len-towrite)
828 i_size_write(inode, off+len-towrite);
829 inode->i_mtime = inode->i_ctime = current_time(inode);
830 mark_inode_dirty(inode);
831 inode_unlock(inode);
832 return len - towrite;
833 }
834
835 static struct dquot **jfs_get_dquots(struct inode *inode)
836 {
837 return JFS_IP(inode)->i_dquot;
838 }
839
840 static int jfs_quota_on(struct super_block *sb, int type, int format_id,
841 const struct path *path)
842 {
843 int err;
844 struct inode *inode;
845
846 err = dquot_quota_on(sb, type, format_id, path);
847 if (err)
848 return err;
849
850 inode = d_inode(path->dentry);
851 inode_lock(inode);
852 JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL;
853 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
854 S_NOATIME | S_IMMUTABLE);
855 inode_unlock(inode);
856 mark_inode_dirty(inode);
857
858 return 0;
859 }
860
861 static int jfs_quota_off(struct super_block *sb, int type)
862 {
863 struct inode *inode = sb_dqopt(sb)->files[type];
864 int err;
865
866 if (!inode || !igrab(inode))
867 goto out;
868
869 err = dquot_quota_off(sb, type);
870 if (err)
871 goto out_put;
872
873 inode_lock(inode);
874 JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL);
875 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
876 inode_unlock(inode);
877 mark_inode_dirty(inode);
878 out_put:
879 iput(inode);
880 return err;
881 out:
882 return dquot_quota_off(sb, type);
883 }
884 #endif
885
886 static const struct super_operations jfs_super_operations = {
887 .alloc_inode = jfs_alloc_inode,
888 .free_inode = jfs_free_inode,
889 .dirty_inode = jfs_dirty_inode,
890 .write_inode = jfs_write_inode,
891 .evict_inode = jfs_evict_inode,
892 .put_super = jfs_put_super,
893 .sync_fs = jfs_sync_fs,
894 .freeze_fs = jfs_freeze,
895 .unfreeze_fs = jfs_unfreeze,
896 .statfs = jfs_statfs,
897 .remount_fs = jfs_remount,
898 .show_options = jfs_show_options,
899 #ifdef CONFIG_QUOTA
900 .quota_read = jfs_quota_read,
901 .quota_write = jfs_quota_write,
902 .get_dquots = jfs_get_dquots,
903 #endif
904 };
905
906 static const struct export_operations jfs_export_operations = {
907 .fh_to_dentry = jfs_fh_to_dentry,
908 .fh_to_parent = jfs_fh_to_parent,
909 .get_parent = jfs_get_parent,
910 };
911
912 static struct file_system_type jfs_fs_type = {
913 .owner = THIS_MODULE,
914 .name = "jfs",
915 .mount = jfs_do_mount,
916 .kill_sb = kill_block_super,
917 .fs_flags = FS_REQUIRES_DEV,
918 };
919 MODULE_ALIAS_FS("jfs");
920
921 static void init_once(void *foo)
922 {
923 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
924
925 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
926 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
927 init_rwsem(&jfs_ip->rdwrlock);
928 mutex_init(&jfs_ip->commit_mutex);
929 init_rwsem(&jfs_ip->xattr_sem);
930 spin_lock_init(&jfs_ip->ag_lock);
931 jfs_ip->active_ag = -1;
932 inode_init_once(&jfs_ip->vfs_inode);
933 }
934
935 static int __init init_jfs_fs(void)
936 {
937 int i;
938 int rc;
939
940 jfs_inode_cachep =
941 kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info),
942 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
943 offsetof(struct jfs_inode_info, i_inline), IDATASIZE,
944 init_once);
945 if (jfs_inode_cachep == NULL)
946 return -ENOMEM;
947
948 /*
949 * Metapage initialization
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 * Transaction Manager initialization
959 */
960 rc = txInit();
961 if (rc) {
962 jfs_err("txInit failed w/rc = %d", rc);
963 goto free_metapage;
964 }
965
966 /*
967 * I/O completion thread (endio)
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);
1011 kill_committask:
1012 for (i = 0; i < commit_threads; i++)
1013 kthread_stop(jfsCommitThread[i]);
1014 kthread_stop(jfsIOthread);
1015 end_txmngr:
1016 txExit();
1017 free_metapage:
1018 metapage_exit();
1019 free_slab:
1020 kmem_cache_destroy(jfs_inode_cachep);
1021 return rc;
1022 }
1023
1024 static 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 * Make sure all delayed rcu free inodes are flushed before we
1044 * destroy cache.
1045 */
1046 rcu_barrier();
1047 kmem_cache_destroy(jfs_inode_cachep);
1048 }
1049
1050 module_init(init_jfs_fs)
1051 module_exit(exit_jfs_fs)
Linux with added FPC-III support