GNU Linux-libre 5.19-rc6-gnu
[releases.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 = 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 = sb->s_blocksize - offset < toread ?
749                                 sb->s_blocksize - offset : toread;
750
751                 tmp_bh.b_state = 0;
752                 tmp_bh.b_size = i_blocksize(inode);
753                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
754                 if (err)
755                         return err;
756                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
757                         memset(data, 0, tocopy);
758                 else {
759                         bh = sb_bread(sb, tmp_bh.b_blocknr);
760                         if (!bh)
761                                 return -EIO;
762                         memcpy(data, bh->b_data+offset, tocopy);
763                         brelse(bh);
764                 }
765                 offset = 0;
766                 toread -= tocopy;
767                 data += tocopy;
768                 blk++;
769         }
770         return len;
771 }
772
773 /* Write to quotafile */
774 static ssize_t jfs_quota_write(struct super_block *sb, int type,
775                                const char *data, size_t len, loff_t off)
776 {
777         struct inode *inode = sb_dqopt(sb)->files[type];
778         sector_t blk = off >> sb->s_blocksize_bits;
779         int err = 0;
780         int offset = off & (sb->s_blocksize - 1);
781         int tocopy;
782         size_t towrite = len;
783         struct buffer_head tmp_bh;
784         struct buffer_head *bh;
785
786         inode_lock(inode);
787         while (towrite > 0) {
788                 tocopy = sb->s_blocksize - offset < towrite ?
789                                 sb->s_blocksize - offset : towrite;
790
791                 tmp_bh.b_state = 0;
792                 tmp_bh.b_size = i_blocksize(inode);
793                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
794                 if (err)
795                         goto out;
796                 if (offset || tocopy != sb->s_blocksize)
797                         bh = sb_bread(sb, tmp_bh.b_blocknr);
798                 else
799                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
800                 if (!bh) {
801                         err = -EIO;
802                         goto out;
803                 }
804                 lock_buffer(bh);
805                 memcpy(bh->b_data+offset, data, tocopy);
806                 flush_dcache_page(bh->b_page);
807                 set_buffer_uptodate(bh);
808                 mark_buffer_dirty(bh);
809                 unlock_buffer(bh);
810                 brelse(bh);
811                 offset = 0;
812                 towrite -= tocopy;
813                 data += tocopy;
814                 blk++;
815         }
816 out:
817         if (len == towrite) {
818                 inode_unlock(inode);
819                 return err;
820         }
821         if (inode->i_size < off+len-towrite)
822                 i_size_write(inode, off+len-towrite);
823         inode->i_mtime = inode->i_ctime = current_time(inode);
824         mark_inode_dirty(inode);
825         inode_unlock(inode);
826         return len - towrite;
827 }
828
829 static struct dquot **jfs_get_dquots(struct inode *inode)
830 {
831         return JFS_IP(inode)->i_dquot;
832 }
833
834 static int jfs_quota_on(struct super_block *sb, int type, int format_id,
835                         const struct path *path)
836 {
837         int err;
838         struct inode *inode;
839
840         err = dquot_quota_on(sb, type, format_id, path);
841         if (err)
842                 return err;
843
844         inode = d_inode(path->dentry);
845         inode_lock(inode);
846         JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL;
847         inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
848                         S_NOATIME | S_IMMUTABLE);
849         inode_unlock(inode);
850         mark_inode_dirty(inode);
851
852         return 0;
853 }
854
855 static int jfs_quota_off(struct super_block *sb, int type)
856 {
857         struct inode *inode = sb_dqopt(sb)->files[type];
858         int err;
859
860         if (!inode || !igrab(inode))
861                 goto out;
862
863         err = dquot_quota_off(sb, type);
864         if (err)
865                 goto out_put;
866
867         inode_lock(inode);
868         JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL);
869         inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
870         inode_unlock(inode);
871         mark_inode_dirty(inode);
872 out_put:
873         iput(inode);
874         return err;
875 out:
876         return dquot_quota_off(sb, type);
877 }
878 #endif
879
880 static const struct super_operations jfs_super_operations = {
881         .alloc_inode    = jfs_alloc_inode,
882         .free_inode     = jfs_free_inode,
883         .dirty_inode    = jfs_dirty_inode,
884         .write_inode    = jfs_write_inode,
885         .evict_inode    = jfs_evict_inode,
886         .put_super      = jfs_put_super,
887         .sync_fs        = jfs_sync_fs,
888         .freeze_fs      = jfs_freeze,
889         .unfreeze_fs    = jfs_unfreeze,
890         .statfs         = jfs_statfs,
891         .remount_fs     = jfs_remount,
892         .show_options   = jfs_show_options,
893 #ifdef CONFIG_QUOTA
894         .quota_read     = jfs_quota_read,
895         .quota_write    = jfs_quota_write,
896         .get_dquots     = jfs_get_dquots,
897 #endif
898 };
899
900 static const struct export_operations jfs_export_operations = {
901         .fh_to_dentry   = jfs_fh_to_dentry,
902         .fh_to_parent   = jfs_fh_to_parent,
903         .get_parent     = jfs_get_parent,
904 };
905
906 static struct file_system_type jfs_fs_type = {
907         .owner          = THIS_MODULE,
908         .name           = "jfs",
909         .mount          = jfs_do_mount,
910         .kill_sb        = kill_block_super,
911         .fs_flags       = FS_REQUIRES_DEV,
912 };
913 MODULE_ALIAS_FS("jfs");
914
915 static void init_once(void *foo)
916 {
917         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
918
919         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
920         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
921         init_rwsem(&jfs_ip->rdwrlock);
922         mutex_init(&jfs_ip->commit_mutex);
923         init_rwsem(&jfs_ip->xattr_sem);
924         spin_lock_init(&jfs_ip->ag_lock);
925         jfs_ip->active_ag = -1;
926         inode_init_once(&jfs_ip->vfs_inode);
927 }
928
929 static int __init init_jfs_fs(void)
930 {
931         int i;
932         int rc;
933
934         jfs_inode_cachep =
935             kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info),
936                         0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
937                         offsetof(struct jfs_inode_info, i_inline_all),
938                         sizeof_field(struct jfs_inode_info, i_inline_all),
939                         init_once);
940         if (jfs_inode_cachep == NULL)
941                 return -ENOMEM;
942
943         /*
944          * Metapage initialization
945          */
946         rc = metapage_init();
947         if (rc) {
948                 jfs_err("metapage_init failed w/rc = %d", rc);
949                 goto free_slab;
950         }
951
952         /*
953          * Transaction Manager initialization
954          */
955         rc = txInit();
956         if (rc) {
957                 jfs_err("txInit failed w/rc = %d", rc);
958                 goto free_metapage;
959         }
960
961         /*
962          * I/O completion thread (endio)
963          */
964         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
965         if (IS_ERR(jfsIOthread)) {
966                 rc = PTR_ERR(jfsIOthread);
967                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
968                 goto end_txmngr;
969         }
970
971         if (commit_threads < 1)
972                 commit_threads = num_online_cpus();
973         if (commit_threads > MAX_COMMIT_THREADS)
974                 commit_threads = MAX_COMMIT_THREADS;
975
976         for (i = 0; i < commit_threads; i++) {
977                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
978                                                  "jfsCommit");
979                 if (IS_ERR(jfsCommitThread[i])) {
980                         rc = PTR_ERR(jfsCommitThread[i]);
981                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
982                         commit_threads = i;
983                         goto kill_committask;
984                 }
985         }
986
987         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
988         if (IS_ERR(jfsSyncThread)) {
989                 rc = PTR_ERR(jfsSyncThread);
990                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
991                 goto kill_committask;
992         }
993
994 #ifdef PROC_FS_JFS
995         jfs_proc_init();
996 #endif
997
998         rc = register_filesystem(&jfs_fs_type);
999         if (!rc)
1000                 return 0;
1001
1002 #ifdef PROC_FS_JFS
1003         jfs_proc_clean();
1004 #endif
1005         kthread_stop(jfsSyncThread);
1006 kill_committask:
1007         for (i = 0; i < commit_threads; i++)
1008                 kthread_stop(jfsCommitThread[i]);
1009         kthread_stop(jfsIOthread);
1010 end_txmngr:
1011         txExit();
1012 free_metapage:
1013         metapage_exit();
1014 free_slab:
1015         kmem_cache_destroy(jfs_inode_cachep);
1016         return rc;
1017 }
1018
1019 static void __exit exit_jfs_fs(void)
1020 {
1021         int i;
1022
1023         jfs_info("exit_jfs_fs called");
1024
1025         txExit();
1026         metapage_exit();
1027
1028         kthread_stop(jfsIOthread);
1029         for (i = 0; i < commit_threads; i++)
1030                 kthread_stop(jfsCommitThread[i]);
1031         kthread_stop(jfsSyncThread);
1032 #ifdef PROC_FS_JFS
1033         jfs_proc_clean();
1034 #endif
1035         unregister_filesystem(&jfs_fs_type);
1036
1037         /*
1038          * Make sure all delayed rcu free inodes are flushed before we
1039          * destroy cache.
1040          */
1041         rcu_barrier();
1042         kmem_cache_destroy(jfs_inode_cachep);
1043 }
1044
1045 module_init(init_jfs_fs)
1046 module_exit(exit_jfs_fs)