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 MODULE_IMPORT_NS(ANDROID_GKI_VFS_EXPORT_ONLY);
41
42 static struct kmem_cache *jfs_inode_cachep;
43
44 static const struct super_operations jfs_super_operations;
45 static const struct export_operations jfs_export_operations;
46 static struct file_system_type jfs_fs_type;
47
48 #define MAX_COMMIT_THREADS 64
49 static int commit_threads;
50 module_param(commit_threads, int, 0);
51 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
52
53 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
54 struct task_struct *jfsIOthread;
55 struct task_struct *jfsSyncThread;
56
57 #ifdef CONFIG_JFS_DEBUG
58 int jfsloglevel = JFS_LOGLEVEL_WARN;
59 module_param(jfsloglevel, int, 0644);
60 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
61 #endif
62
jfs_handle_error(struct super_block * sb)63 static void jfs_handle_error(struct super_block *sb)
64 {
65 struct jfs_sb_info *sbi = JFS_SBI(sb);
66
67 if (sb_rdonly(sb))
68 return;
69
70 updateSuper(sb, FM_DIRTY);
71
72 if (sbi->flag & JFS_ERR_PANIC)
73 panic("JFS (device %s): panic forced after error\n",
74 sb->s_id);
75 else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
76 jfs_err("ERROR: (device %s): remounting filesystem as read-only",
77 sb->s_id);
78 sb->s_flags |= SB_RDONLY;
79 }
80
81 /* nothing is done for continue beyond marking the superblock dirty */
82 }
83
jfs_error(struct super_block * sb,const char * fmt,...)84 void jfs_error(struct super_block *sb, const char *fmt, ...)
85 {
86 struct va_format vaf;
87 va_list args;
88
89 va_start(args, fmt);
90
91 vaf.fmt = fmt;
92 vaf.va = &args;
93
94 pr_err("ERROR: (device %s): %ps: %pV\n",
95 sb->s_id, __builtin_return_address(0), &vaf);
96
97 va_end(args);
98
99 jfs_handle_error(sb);
100 }
101
jfs_alloc_inode(struct super_block * sb)102 static struct inode *jfs_alloc_inode(struct super_block *sb)
103 {
104 struct jfs_inode_info *jfs_inode;
105
106 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
107 if (!jfs_inode)
108 return NULL;
109 #ifdef CONFIG_QUOTA
110 memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot));
111 #endif
112 return &jfs_inode->vfs_inode;
113 }
114
jfs_free_inode(struct inode * inode)115 static void jfs_free_inode(struct inode *inode)
116 {
117 kmem_cache_free(jfs_inode_cachep, JFS_IP(inode));
118 }
119
jfs_statfs(struct dentry * dentry,struct kstatfs * buf)120 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
121 {
122 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
123 s64 maxinodes;
124 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
125
126 jfs_info("In jfs_statfs");
127 buf->f_type = JFS_SUPER_MAGIC;
128 buf->f_bsize = sbi->bsize;
129 buf->f_blocks = sbi->bmap->db_mapsize;
130 buf->f_bfree = sbi->bmap->db_nfree;
131 buf->f_bavail = sbi->bmap->db_nfree;
132 /*
133 * If we really return the number of allocated & free inodes, some
134 * applications will fail because they won't see enough free inodes.
135 * We'll try to calculate some guess as to how many inodes we can
136 * really allocate
137 *
138 * buf->f_files = atomic_read(&imap->im_numinos);
139 * buf->f_ffree = atomic_read(&imap->im_numfree);
140 */
141 maxinodes = min((s64) atomic_read(&imap->im_numinos) +
142 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
143 << L2INOSPEREXT), (s64) 0xffffffffLL);
144 buf->f_files = maxinodes;
145 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
146 atomic_read(&imap->im_numfree));
147 buf->f_fsid.val[0] = crc32_le(0, (char *)&sbi->uuid,
148 sizeof(sbi->uuid)/2);
149 buf->f_fsid.val[1] = crc32_le(0,
150 (char *)&sbi->uuid + sizeof(sbi->uuid)/2,
151 sizeof(sbi->uuid)/2);
152
153 buf->f_namelen = JFS_NAME_MAX;
154 return 0;
155 }
156
157 #ifdef CONFIG_QUOTA
158 static int jfs_quota_off(struct super_block *sb, int type);
159 static int jfs_quota_on(struct super_block *sb, int type, int format_id,
160 const struct path *path);
161
jfs_quota_off_umount(struct super_block * sb)162 static void jfs_quota_off_umount(struct super_block *sb)
163 {
164 int type;
165
166 for (type = 0; type < MAXQUOTAS; type++)
167 jfs_quota_off(sb, type);
168 }
169
170 static const struct quotactl_ops jfs_quotactl_ops = {
171 .quota_on = jfs_quota_on,
172 .quota_off = jfs_quota_off,
173 .quota_sync = dquot_quota_sync,
174 .get_state = dquot_get_state,
175 .set_info = dquot_set_dqinfo,
176 .get_dqblk = dquot_get_dqblk,
177 .set_dqblk = dquot_set_dqblk,
178 .get_nextdqblk = dquot_get_next_dqblk,
179 };
180 #else
jfs_quota_off_umount(struct super_block * sb)181 static inline void jfs_quota_off_umount(struct super_block *sb)
182 {
183 }
184 #endif
185
jfs_put_super(struct super_block * sb)186 static void jfs_put_super(struct super_block *sb)
187 {
188 struct jfs_sb_info *sbi = JFS_SBI(sb);
189 int rc;
190
191 jfs_info("In jfs_put_super");
192
193 jfs_quota_off_umount(sb);
194
195 rc = jfs_umount(sb);
196 if (rc)
197 jfs_err("jfs_umount failed with return code %d", rc);
198
199 unload_nls(sbi->nls_tab);
200
201 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
202 iput(sbi->direct_inode);
203
204 kfree(sbi);
205 }
206
207 enum {
208 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
209 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
210 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask,
211 Opt_discard, Opt_nodiscard, Opt_discard_minblk
212 };
213
214 static const match_table_t tokens = {
215 {Opt_integrity, "integrity"},
216 {Opt_nointegrity, "nointegrity"},
217 {Opt_iocharset, "iocharset=%s"},
218 {Opt_resize, "resize=%u"},
219 {Opt_resize_nosize, "resize"},
220 {Opt_errors, "errors=%s"},
221 {Opt_ignore, "noquota"},
222 {Opt_quota, "quota"},
223 {Opt_usrquota, "usrquota"},
224 {Opt_grpquota, "grpquota"},
225 {Opt_uid, "uid=%u"},
226 {Opt_gid, "gid=%u"},
227 {Opt_umask, "umask=%u"},
228 {Opt_discard, "discard"},
229 {Opt_nodiscard, "nodiscard"},
230 {Opt_discard_minblk, "discard=%u"},
231 {Opt_err, NULL}
232 };
233
parse_options(char * options,struct super_block * sb,s64 * newLVSize,int * flag)234 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
235 int *flag)
236 {
237 void *nls_map = (void *)-1; /* -1: no change; NULL: none */
238 char *p;
239 struct jfs_sb_info *sbi = JFS_SBI(sb);
240
241 *newLVSize = 0;
242
243 if (!options)
244 return 1;
245
246 while ((p = strsep(&options, ",")) != NULL) {
247 substring_t args[MAX_OPT_ARGS];
248 int token;
249 if (!*p)
250 continue;
251
252 token = match_token(p, tokens, args);
253 switch (token) {
254 case Opt_integrity:
255 *flag &= ~JFS_NOINTEGRITY;
256 break;
257 case Opt_nointegrity:
258 *flag |= JFS_NOINTEGRITY;
259 break;
260 case Opt_ignore:
261 /* Silently ignore the quota options */
262 /* Don't do anything ;-) */
263 break;
264 case Opt_iocharset:
265 if (nls_map && nls_map != (void *) -1)
266 unload_nls(nls_map);
267 if (!strcmp(args[0].from, "none"))
268 nls_map = NULL;
269 else {
270 nls_map = load_nls(args[0].from);
271 if (!nls_map) {
272 pr_err("JFS: charset not found\n");
273 goto cleanup;
274 }
275 }
276 break;
277 case Opt_resize:
278 {
279 char *resize = args[0].from;
280 int rc = kstrtoll(resize, 0, newLVSize);
281
282 if (rc)
283 goto cleanup;
284 break;
285 }
286 case Opt_resize_nosize:
287 {
288 *newLVSize = i_size_read(sb->s_bdev->bd_inode) >>
289 sb->s_blocksize_bits;
290 if (*newLVSize == 0)
291 pr_err("JFS: Cannot determine volume size\n");
292 break;
293 }
294 case Opt_errors:
295 {
296 char *errors = args[0].from;
297 if (!errors || !*errors)
298 goto cleanup;
299 if (!strcmp(errors, "continue")) {
300 *flag &= ~JFS_ERR_REMOUNT_RO;
301 *flag &= ~JFS_ERR_PANIC;
302 *flag |= JFS_ERR_CONTINUE;
303 } else if (!strcmp(errors, "remount-ro")) {
304 *flag &= ~JFS_ERR_CONTINUE;
305 *flag &= ~JFS_ERR_PANIC;
306 *flag |= JFS_ERR_REMOUNT_RO;
307 } else if (!strcmp(errors, "panic")) {
308 *flag &= ~JFS_ERR_CONTINUE;
309 *flag &= ~JFS_ERR_REMOUNT_RO;
310 *flag |= JFS_ERR_PANIC;
311 } else {
312 pr_err("JFS: %s is an invalid error handler\n",
313 errors);
314 goto cleanup;
315 }
316 break;
317 }
318
319 #ifdef CONFIG_QUOTA
320 case Opt_quota:
321 case Opt_usrquota:
322 *flag |= JFS_USRQUOTA;
323 break;
324 case Opt_grpquota:
325 *flag |= JFS_GRPQUOTA;
326 break;
327 #else
328 case Opt_usrquota:
329 case Opt_grpquota:
330 case Opt_quota:
331 pr_err("JFS: quota operations not supported\n");
332 break;
333 #endif
334 case Opt_uid:
335 {
336 char *uid = args[0].from;
337 uid_t val;
338 int rc = kstrtouint(uid, 0, &val);
339
340 if (rc)
341 goto cleanup;
342 sbi->uid = make_kuid(current_user_ns(), val);
343 if (!uid_valid(sbi->uid))
344 goto cleanup;
345 break;
346 }
347
348 case Opt_gid:
349 {
350 char *gid = args[0].from;
351 gid_t val;
352 int rc = kstrtouint(gid, 0, &val);
353
354 if (rc)
355 goto cleanup;
356 sbi->gid = make_kgid(current_user_ns(), val);
357 if (!gid_valid(sbi->gid))
358 goto cleanup;
359 break;
360 }
361
362 case Opt_umask:
363 {
364 char *umask = args[0].from;
365 int rc = kstrtouint(umask, 8, &sbi->umask);
366
367 if (rc)
368 goto cleanup;
369 if (sbi->umask & ~0777) {
370 pr_err("JFS: Invalid value of umask\n");
371 goto cleanup;
372 }
373 break;
374 }
375
376 case Opt_discard:
377 {
378 struct request_queue *q = bdev_get_queue(sb->s_bdev);
379 /* if set to 1, even copying files will cause
380 * trimming :O
381 * -> user has more control over the online trimming
382 */
383 sbi->minblks_trim = 64;
384 if (blk_queue_discard(q))
385 *flag |= JFS_DISCARD;
386 else
387 pr_err("JFS: discard option not supported on device\n");
388 break;
389 }
390
391 case Opt_nodiscard:
392 *flag &= ~JFS_DISCARD;
393 break;
394
395 case Opt_discard_minblk:
396 {
397 struct request_queue *q = bdev_get_queue(sb->s_bdev);
398 char *minblks_trim = args[0].from;
399 int rc;
400 if (blk_queue_discard(q)) {
401 *flag |= JFS_DISCARD;
402 rc = kstrtouint(minblks_trim, 0,
403 &sbi->minblks_trim);
404 if (rc)
405 goto cleanup;
406 } else
407 pr_err("JFS: discard option not supported on device\n");
408 break;
409 }
410
411 default:
412 printk("jfs: Unrecognized mount option \"%s\" or missing value\n",
413 p);
414 goto cleanup;
415 }
416 }
417
418 if (nls_map != (void *) -1) {
419 /* Discard old (if remount) */
420 unload_nls(sbi->nls_tab);
421 sbi->nls_tab = nls_map;
422 }
423 return 1;
424
425 cleanup:
426 if (nls_map && nls_map != (void *) -1)
427 unload_nls(nls_map);
428 return 0;
429 }
430
jfs_remount(struct super_block * sb,int * flags,char * data)431 static int jfs_remount(struct super_block *sb, int *flags, char *data)
432 {
433 s64 newLVSize = 0;
434 int rc = 0;
435 int flag = JFS_SBI(sb)->flag;
436 int ret;
437
438 sync_filesystem(sb);
439 if (!parse_options(data, sb, &newLVSize, &flag))
440 return -EINVAL;
441
442 if (newLVSize) {
443 if (sb_rdonly(sb)) {
444 pr_err("JFS: resize requires volume to be mounted read-write\n");
445 return -EROFS;
446 }
447 rc = jfs_extendfs(sb, newLVSize, 0);
448 if (rc)
449 return rc;
450 }
451
452 if (sb_rdonly(sb) && !(*flags & SB_RDONLY)) {
453 /*
454 * Invalidate any previously read metadata. fsck may have
455 * changed the on-disk data since we mounted r/o
456 */
457 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
458
459 JFS_SBI(sb)->flag = flag;
460 ret = jfs_mount_rw(sb, 1);
461
462 /* mark the fs r/w for quota activity */
463 sb->s_flags &= ~SB_RDONLY;
464
465 dquot_resume(sb, -1);
466 return ret;
467 }
468 if (!sb_rdonly(sb) && (*flags & SB_RDONLY)) {
469 rc = dquot_suspend(sb, -1);
470 if (rc < 0)
471 return rc;
472 rc = jfs_umount_rw(sb);
473 JFS_SBI(sb)->flag = flag;
474 return rc;
475 }
476 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
477 if (!sb_rdonly(sb)) {
478 rc = jfs_umount_rw(sb);
479 if (rc)
480 return rc;
481
482 JFS_SBI(sb)->flag = flag;
483 ret = jfs_mount_rw(sb, 1);
484 return ret;
485 }
486 JFS_SBI(sb)->flag = flag;
487
488 return 0;
489 }
490
jfs_fill_super(struct super_block * sb,void * data,int silent)491 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
492 {
493 struct jfs_sb_info *sbi;
494 struct inode *inode;
495 int rc;
496 s64 newLVSize = 0;
497 int flag, ret = -EINVAL;
498
499 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
500
501 sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL);
502 if (!sbi)
503 return -ENOMEM;
504
505 sb->s_fs_info = sbi;
506 sb->s_max_links = JFS_LINK_MAX;
507 sb->s_time_min = 0;
508 sb->s_time_max = U32_MAX;
509 sbi->sb = sb;
510 sbi->uid = INVALID_UID;
511 sbi->gid = INVALID_GID;
512 sbi->umask = -1;
513
514 /* initialize the mount flag and determine the default error handler */
515 flag = JFS_ERR_REMOUNT_RO;
516
517 if (!parse_options((char *) data, sb, &newLVSize, &flag))
518 goto out_kfree;
519 sbi->flag = flag;
520
521 #ifdef CONFIG_JFS_POSIX_ACL
522 sb->s_flags |= SB_POSIXACL;
523 #endif
524
525 if (newLVSize) {
526 pr_err("resize option for remount only\n");
527 goto out_kfree;
528 }
529
530 /*
531 * Initialize blocksize to 4K.
532 */
533 sb_set_blocksize(sb, PSIZE);
534
535 /*
536 * Set method vectors.
537 */
538 sb->s_op = &jfs_super_operations;
539 sb->s_export_op = &jfs_export_operations;
540 sb->s_xattr = jfs_xattr_handlers;
541 #ifdef CONFIG_QUOTA
542 sb->dq_op = &dquot_operations;
543 sb->s_qcop = &jfs_quotactl_ops;
544 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
545 #endif
546
547 /*
548 * Initialize direct-mapping inode/address-space
549 */
550 inode = new_inode(sb);
551 if (inode == NULL) {
552 ret = -ENOMEM;
553 goto out_unload;
554 }
555 inode->i_ino = 0;
556 inode->i_size = i_size_read(sb->s_bdev->bd_inode);
557 inode->i_mapping->a_ops = &jfs_metapage_aops;
558 inode_fake_hash(inode);
559 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
560
561 sbi->direct_inode = inode;
562
563 rc = jfs_mount(sb);
564 if (rc) {
565 if (!silent)
566 jfs_err("jfs_mount failed w/return code = %d", rc);
567 goto out_mount_failed;
568 }
569 if (sb_rdonly(sb))
570 sbi->log = NULL;
571 else {
572 rc = jfs_mount_rw(sb, 0);
573 if (rc) {
574 if (!silent) {
575 jfs_err("jfs_mount_rw failed, return code = %d",
576 rc);
577 }
578 goto out_no_rw;
579 }
580 }
581
582 sb->s_magic = JFS_SUPER_MAGIC;
583
584 if (sbi->mntflag & JFS_OS2)
585 sb->s_d_op = &jfs_ci_dentry_operations;
586
587 inode = jfs_iget(sb, ROOT_I);
588 if (IS_ERR(inode)) {
589 ret = PTR_ERR(inode);
590 goto out_no_rw;
591 }
592 sb->s_root = d_make_root(inode);
593 if (!sb->s_root)
594 goto out_no_root;
595
596 /* logical blocks are represented by 40 bits in pxd_t, etc.
597 * and page cache is indexed by long
598 */
599 sb->s_maxbytes = min(((loff_t)sb->s_blocksize) << 40, MAX_LFS_FILESIZE);
600 sb->s_time_gran = 1;
601 return 0;
602
603 out_no_root:
604 jfs_err("jfs_read_super: get root dentry failed");
605
606 out_no_rw:
607 rc = jfs_umount(sb);
608 if (rc)
609 jfs_err("jfs_umount failed with return code %d", rc);
610 out_mount_failed:
611 filemap_write_and_wait(sbi->direct_inode->i_mapping);
612 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
613 make_bad_inode(sbi->direct_inode);
614 iput(sbi->direct_inode);
615 sbi->direct_inode = NULL;
616 out_unload:
617 unload_nls(sbi->nls_tab);
618 out_kfree:
619 kfree(sbi);
620 return ret;
621 }
622
jfs_freeze(struct super_block * sb)623 static int jfs_freeze(struct super_block *sb)
624 {
625 struct jfs_sb_info *sbi = JFS_SBI(sb);
626 struct jfs_log *log = sbi->log;
627 int rc = 0;
628
629 if (!sb_rdonly(sb)) {
630 txQuiesce(sb);
631 rc = lmLogShutdown(log);
632 if (rc) {
633 jfs_error(sb, "lmLogShutdown failed\n");
634
635 /* let operations fail rather than hang */
636 txResume(sb);
637
638 return rc;
639 }
640 rc = updateSuper(sb, FM_CLEAN);
641 if (rc) {
642 jfs_err("jfs_freeze: updateSuper failed");
643 /*
644 * Don't fail here. Everything succeeded except
645 * marking the superblock clean, so there's really
646 * no harm in leaving it frozen for now.
647 */
648 }
649 }
650 return 0;
651 }
652
jfs_unfreeze(struct super_block * sb)653 static int jfs_unfreeze(struct super_block *sb)
654 {
655 struct jfs_sb_info *sbi = JFS_SBI(sb);
656 struct jfs_log *log = sbi->log;
657 int rc = 0;
658
659 if (!sb_rdonly(sb)) {
660 rc = updateSuper(sb, FM_MOUNT);
661 if (rc) {
662 jfs_error(sb, "updateSuper failed\n");
663 goto out;
664 }
665 rc = lmLogInit(log);
666 if (rc)
667 jfs_error(sb, "lmLogInit failed\n");
668 out:
669 txResume(sb);
670 }
671 return rc;
672 }
673
jfs_do_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)674 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
675 int flags, const char *dev_name, void *data)
676 {
677 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
678 }
679
jfs_sync_fs(struct super_block * sb,int wait)680 static int jfs_sync_fs(struct super_block *sb, int wait)
681 {
682 struct jfs_log *log = JFS_SBI(sb)->log;
683
684 /* log == NULL indicates read-only mount */
685 if (log) {
686 /*
687 * Write quota structures to quota file, sync_blockdev() will
688 * write them to disk later
689 */
690 dquot_writeback_dquots(sb, -1);
691 jfs_flush_journal(log, wait);
692 jfs_syncpt(log, 0);
693 }
694
695 return 0;
696 }
697
jfs_show_options(struct seq_file * seq,struct dentry * root)698 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
699 {
700 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
701
702 if (uid_valid(sbi->uid))
703 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
704 if (gid_valid(sbi->gid))
705 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
706 if (sbi->umask != -1)
707 seq_printf(seq, ",umask=%03o", sbi->umask);
708 if (sbi->flag & JFS_NOINTEGRITY)
709 seq_puts(seq, ",nointegrity");
710 if (sbi->flag & JFS_DISCARD)
711 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
712 if (sbi->nls_tab)
713 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
714 if (sbi->flag & JFS_ERR_CONTINUE)
715 seq_printf(seq, ",errors=continue");
716 if (sbi->flag & JFS_ERR_PANIC)
717 seq_printf(seq, ",errors=panic");
718
719 #ifdef CONFIG_QUOTA
720 if (sbi->flag & JFS_USRQUOTA)
721 seq_puts(seq, ",usrquota");
722
723 if (sbi->flag & JFS_GRPQUOTA)
724 seq_puts(seq, ",grpquota");
725 #endif
726
727 return 0;
728 }
729
730 #ifdef CONFIG_QUOTA
731
732 /* Read data from quotafile - avoid pagecache and such because we cannot afford
733 * acquiring the locks... As quota files are never truncated and quota code
734 * itself serializes the operations (and no one else should touch the files)
735 * we don't have to be afraid of races */
jfs_quota_read(struct super_block * sb,int type,char * data,size_t len,loff_t off)736 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
737 size_t len, loff_t off)
738 {
739 struct inode *inode = sb_dqopt(sb)->files[type];
740 sector_t blk = off >> sb->s_blocksize_bits;
741 int err = 0;
742 int offset = off & (sb->s_blocksize - 1);
743 int tocopy;
744 size_t toread;
745 struct buffer_head tmp_bh;
746 struct buffer_head *bh;
747 loff_t i_size = i_size_read(inode);
748
749 if (off > i_size)
750 return 0;
751 if (off+len > i_size)
752 len = i_size-off;
753 toread = len;
754 while (toread > 0) {
755 tocopy = sb->s_blocksize - offset < toread ?
756 sb->s_blocksize - offset : toread;
757
758 tmp_bh.b_state = 0;
759 tmp_bh.b_size = i_blocksize(inode);
760 err = jfs_get_block(inode, blk, &tmp_bh, 0);
761 if (err)
762 return err;
763 if (!buffer_mapped(&tmp_bh)) /* A hole? */
764 memset(data, 0, tocopy);
765 else {
766 bh = sb_bread(sb, tmp_bh.b_blocknr);
767 if (!bh)
768 return -EIO;
769 memcpy(data, bh->b_data+offset, tocopy);
770 brelse(bh);
771 }
772 offset = 0;
773 toread -= tocopy;
774 data += tocopy;
775 blk++;
776 }
777 return len;
778 }
779
780 /* Write to quotafile */
jfs_quota_write(struct super_block * sb,int type,const char * data,size_t len,loff_t off)781 static ssize_t jfs_quota_write(struct super_block *sb, int type,
782 const char *data, size_t len, loff_t off)
783 {
784 struct inode *inode = sb_dqopt(sb)->files[type];
785 sector_t blk = off >> sb->s_blocksize_bits;
786 int err = 0;
787 int offset = off & (sb->s_blocksize - 1);
788 int tocopy;
789 size_t towrite = len;
790 struct buffer_head tmp_bh;
791 struct buffer_head *bh;
792
793 inode_lock(inode);
794 while (towrite > 0) {
795 tocopy = sb->s_blocksize - offset < towrite ?
796 sb->s_blocksize - offset : towrite;
797
798 tmp_bh.b_state = 0;
799 tmp_bh.b_size = i_blocksize(inode);
800 err = jfs_get_block(inode, blk, &tmp_bh, 1);
801 if (err)
802 goto out;
803 if (offset || tocopy != sb->s_blocksize)
804 bh = sb_bread(sb, tmp_bh.b_blocknr);
805 else
806 bh = sb_getblk(sb, tmp_bh.b_blocknr);
807 if (!bh) {
808 err = -EIO;
809 goto out;
810 }
811 lock_buffer(bh);
812 memcpy(bh->b_data+offset, data, tocopy);
813 flush_dcache_page(bh->b_page);
814 set_buffer_uptodate(bh);
815 mark_buffer_dirty(bh);
816 unlock_buffer(bh);
817 brelse(bh);
818 offset = 0;
819 towrite -= tocopy;
820 data += tocopy;
821 blk++;
822 }
823 out:
824 if (len == towrite) {
825 inode_unlock(inode);
826 return err;
827 }
828 if (inode->i_size < off+len-towrite)
829 i_size_write(inode, off+len-towrite);
830 inode->i_mtime = inode->i_ctime = current_time(inode);
831 mark_inode_dirty(inode);
832 inode_unlock(inode);
833 return len - towrite;
834 }
835
jfs_get_dquots(struct inode * inode)836 static struct dquot **jfs_get_dquots(struct inode *inode)
837 {
838 return JFS_IP(inode)->i_dquot;
839 }
840
jfs_quota_on(struct super_block * sb,int type,int format_id,const struct path * path)841 static int jfs_quota_on(struct super_block *sb, int type, int format_id,
842 const struct path *path)
843 {
844 int err;
845 struct inode *inode;
846
847 err = dquot_quota_on(sb, type, format_id, path);
848 if (err)
849 return err;
850
851 inode = d_inode(path->dentry);
852 inode_lock(inode);
853 JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL;
854 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
855 S_NOATIME | S_IMMUTABLE);
856 inode_unlock(inode);
857 mark_inode_dirty(inode);
858
859 return 0;
860 }
861
jfs_quota_off(struct super_block * sb,int type)862 static int jfs_quota_off(struct super_block *sb, int type)
863 {
864 struct inode *inode = sb_dqopt(sb)->files[type];
865 int err;
866
867 if (!inode || !igrab(inode))
868 goto out;
869
870 err = dquot_quota_off(sb, type);
871 if (err)
872 goto out_put;
873
874 inode_lock(inode);
875 JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL);
876 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
877 inode_unlock(inode);
878 mark_inode_dirty(inode);
879 out_put:
880 iput(inode);
881 return err;
882 out:
883 return dquot_quota_off(sb, type);
884 }
885 #endif
886
887 static const struct super_operations jfs_super_operations = {
888 .alloc_inode = jfs_alloc_inode,
889 .free_inode = jfs_free_inode,
890 .dirty_inode = jfs_dirty_inode,
891 .write_inode = jfs_write_inode,
892 .evict_inode = jfs_evict_inode,
893 .put_super = jfs_put_super,
894 .sync_fs = jfs_sync_fs,
895 .freeze_fs = jfs_freeze,
896 .unfreeze_fs = jfs_unfreeze,
897 .statfs = jfs_statfs,
898 .remount_fs = jfs_remount,
899 .show_options = jfs_show_options,
900 #ifdef CONFIG_QUOTA
901 .quota_read = jfs_quota_read,
902 .quota_write = jfs_quota_write,
903 .get_dquots = jfs_get_dquots,
904 #endif
905 };
906
907 static const struct export_operations jfs_export_operations = {
908 .fh_to_dentry = jfs_fh_to_dentry,
909 .fh_to_parent = jfs_fh_to_parent,
910 .get_parent = jfs_get_parent,
911 };
912
913 static struct file_system_type jfs_fs_type = {
914 .owner = THIS_MODULE,
915 .name = "jfs",
916 .mount = jfs_do_mount,
917 .kill_sb = kill_block_super,
918 .fs_flags = FS_REQUIRES_DEV,
919 };
920 MODULE_ALIAS_FS("jfs");
921
init_once(void * foo)922 static void init_once(void *foo)
923 {
924 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
925
926 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
927 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
928 init_rwsem(&jfs_ip->rdwrlock);
929 mutex_init(&jfs_ip->commit_mutex);
930 init_rwsem(&jfs_ip->xattr_sem);
931 spin_lock_init(&jfs_ip->ag_lock);
932 jfs_ip->active_ag = -1;
933 inode_init_once(&jfs_ip->vfs_inode);
934 }
935
init_jfs_fs(void)936 static int __init init_jfs_fs(void)
937 {
938 int i;
939 int rc;
940
941 jfs_inode_cachep =
942 kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info),
943 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
944 offsetof(struct jfs_inode_info, i_inline), IDATASIZE,
945 init_once);
946 if (jfs_inode_cachep == NULL)
947 return -ENOMEM;
948
949 /*
950 * Metapage initialization
951 */
952 rc = metapage_init();
953 if (rc) {
954 jfs_err("metapage_init failed w/rc = %d", rc);
955 goto free_slab;
956 }
957
958 /*
959 * Transaction Manager initialization
960 */
961 rc = txInit();
962 if (rc) {
963 jfs_err("txInit failed w/rc = %d", rc);
964 goto free_metapage;
965 }
966
967 /*
968 * I/O completion thread (endio)
969 */
970 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
971 if (IS_ERR(jfsIOthread)) {
972 rc = PTR_ERR(jfsIOthread);
973 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
974 goto end_txmngr;
975 }
976
977 if (commit_threads < 1)
978 commit_threads = num_online_cpus();
979 if (commit_threads > MAX_COMMIT_THREADS)
980 commit_threads = MAX_COMMIT_THREADS;
981
982 for (i = 0; i < commit_threads; i++) {
983 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
984 "jfsCommit");
985 if (IS_ERR(jfsCommitThread[i])) {
986 rc = PTR_ERR(jfsCommitThread[i]);
987 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
988 commit_threads = i;
989 goto kill_committask;
990 }
991 }
992
993 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
994 if (IS_ERR(jfsSyncThread)) {
995 rc = PTR_ERR(jfsSyncThread);
996 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
997 goto kill_committask;
998 }
999
1000 #ifdef PROC_FS_JFS
1001 jfs_proc_init();
1002 #endif
1003
1004 rc = register_filesystem(&jfs_fs_type);
1005 if (!rc)
1006 return 0;
1007
1008 #ifdef PROC_FS_JFS
1009 jfs_proc_clean();
1010 #endif
1011 kthread_stop(jfsSyncThread);
1012 kill_committask:
1013 for (i = 0; i < commit_threads; i++)
1014 kthread_stop(jfsCommitThread[i]);
1015 kthread_stop(jfsIOthread);
1016 end_txmngr:
1017 txExit();
1018 free_metapage:
1019 metapage_exit();
1020 free_slab:
1021 kmem_cache_destroy(jfs_inode_cachep);
1022 return rc;
1023 }
1024
exit_jfs_fs(void)1025 static void __exit exit_jfs_fs(void)
1026 {
1027 int i;
1028
1029 jfs_info("exit_jfs_fs called");
1030
1031 txExit();
1032 metapage_exit();
1033
1034 kthread_stop(jfsIOthread);
1035 for (i = 0; i < commit_threads; i++)
1036 kthread_stop(jfsCommitThread[i]);
1037 kthread_stop(jfsSyncThread);
1038 #ifdef PROC_FS_JFS
1039 jfs_proc_clean();
1040 #endif
1041 unregister_filesystem(&jfs_fs_type);
1042
1043 /*
1044 * Make sure all delayed rcu free inodes are flushed before we
1045 * destroy cache.
1046 */
1047 rcu_barrier();
1048 kmem_cache_destroy(jfs_inode_cachep);
1049 }
1050
1051 module_init(init_jfs_fs)
1052 module_exit(exit_jfs_fs)
1053