Merge tag 'jfs-4.13' of git://github.com/kleikamp/linux-shaggy
[sfrench/cifs-2.6.git] / fs / jfs / super.c
1 /*
2  *   Copyright (C) International Business Machines Corp., 2000-2004
3  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
4  *
5  *   This program is free software;  you can redistribute it and/or modify
6  *   it under the terms of the GNU General Public License as published by
7  *   the Free Software Foundation; either version 2 of the License, or
8  *   (at your option) any later version.
9  *
10  *   This program is distributed in the hope that it will be useful,
11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
13  *   the GNU General Public License for more details.
14  *
15  *   You should have received a copy of the GNU General Public License
16  *   along with this program;  if not, write to the Free Software
17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18  */
19
20 #include <linux/fs.h>
21 #include <linux/module.h>
22 #include <linux/parser.h>
23 #include <linux/completion.h>
24 #include <linux/vfs.h>
25 #include <linux/quotaops.h>
26 #include <linux/mount.h>
27 #include <linux/moduleparam.h>
28 #include <linux/kthread.h>
29 #include <linux/posix_acl.h>
30 #include <linux/buffer_head.h>
31 #include <linux/exportfs.h>
32 #include <linux/crc32.h>
33 #include <linux/slab.h>
34 #include <linux/uaccess.h>
35 #include <linux/seq_file.h>
36 #include <linux/blkdev.h>
37
38 #include "jfs_incore.h"
39 #include "jfs_filsys.h"
40 #include "jfs_inode.h"
41 #include "jfs_metapage.h"
42 #include "jfs_superblock.h"
43 #include "jfs_dmap.h"
44 #include "jfs_imap.h"
45 #include "jfs_acl.h"
46 #include "jfs_debug.h"
47 #include "jfs_xattr.h"
48 #include "jfs_dinode.h"
49
50 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
51 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
52 MODULE_LICENSE("GPL");
53
54 static struct kmem_cache *jfs_inode_cachep;
55
56 static const struct super_operations jfs_super_operations;
57 static const struct export_operations jfs_export_operations;
58 static struct file_system_type jfs_fs_type;
59
60 #define MAX_COMMIT_THREADS 64
61 static int commit_threads;
62 module_param(commit_threads, int, 0);
63 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
64
65 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
66 struct task_struct *jfsIOthread;
67 struct task_struct *jfsSyncThread;
68
69 #ifdef CONFIG_JFS_DEBUG
70 int jfsloglevel = JFS_LOGLEVEL_WARN;
71 module_param(jfsloglevel, int, 0644);
72 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
73 #endif
74
75 static void jfs_handle_error(struct super_block *sb)
76 {
77         struct jfs_sb_info *sbi = JFS_SBI(sb);
78
79         if (sb->s_flags & MS_RDONLY)
80                 return;
81
82         updateSuper(sb, FM_DIRTY);
83
84         if (sbi->flag & JFS_ERR_PANIC)
85                 panic("JFS (device %s): panic forced after error\n",
86                         sb->s_id);
87         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
88                 jfs_err("ERROR: (device %s): remounting filesystem as read-only",
89                         sb->s_id);
90                 sb->s_flags |= MS_RDONLY;
91         }
92
93         /* nothing is done for continue beyond marking the superblock dirty */
94 }
95
96 void jfs_error(struct super_block *sb, const char *fmt, ...)
97 {
98         struct va_format vaf;
99         va_list args;
100
101         va_start(args, fmt);
102
103         vaf.fmt = fmt;
104         vaf.va = &args;
105
106         pr_err("ERROR: (device %s): %ps: %pV\n",
107                sb->s_id, __builtin_return_address(0), &vaf);
108
109         va_end(args);
110
111         jfs_handle_error(sb);
112 }
113
114 static struct inode *jfs_alloc_inode(struct super_block *sb)
115 {
116         struct jfs_inode_info *jfs_inode;
117
118         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
119         if (!jfs_inode)
120                 return NULL;
121 #ifdef CONFIG_QUOTA
122         memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot));
123 #endif
124         return &jfs_inode->vfs_inode;
125 }
126
127 static void jfs_i_callback(struct rcu_head *head)
128 {
129         struct inode *inode = container_of(head, struct inode, i_rcu);
130         struct jfs_inode_info *ji = JFS_IP(inode);
131         kmem_cache_free(jfs_inode_cachep, ji);
132 }
133
134 static void jfs_destroy_inode(struct inode *inode)
135 {
136         struct jfs_inode_info *ji = JFS_IP(inode);
137
138         BUG_ON(!list_empty(&ji->anon_inode_list));
139
140         spin_lock_irq(&ji->ag_lock);
141         if (ji->active_ag != -1) {
142                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
143                 atomic_dec(&bmap->db_active[ji->active_ag]);
144                 ji->active_ag = -1;
145         }
146         spin_unlock_irq(&ji->ag_lock);
147         call_rcu(&inode->i_rcu, jfs_i_callback);
148 }
149
150 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
151 {
152         struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
153         s64 maxinodes;
154         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
155
156         jfs_info("In jfs_statfs");
157         buf->f_type = JFS_SUPER_MAGIC;
158         buf->f_bsize = sbi->bsize;
159         buf->f_blocks = sbi->bmap->db_mapsize;
160         buf->f_bfree = sbi->bmap->db_nfree;
161         buf->f_bavail = sbi->bmap->db_nfree;
162         /*
163          * If we really return the number of allocated & free inodes, some
164          * applications will fail because they won't see enough free inodes.
165          * We'll try to calculate some guess as to how many inodes we can
166          * really allocate
167          *
168          * buf->f_files = atomic_read(&imap->im_numinos);
169          * buf->f_ffree = atomic_read(&imap->im_numfree);
170          */
171         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
172                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
173                          << L2INOSPEREXT), (s64) 0xffffffffLL);
174         buf->f_files = maxinodes;
175         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
176                                     atomic_read(&imap->im_numfree));
177         buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
178         buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
179                                         sizeof(sbi->uuid)/2);
180
181         buf->f_namelen = JFS_NAME_MAX;
182         return 0;
183 }
184
185 #ifdef CONFIG_QUOTA
186 static int jfs_quota_off(struct super_block *sb, int type);
187 static int jfs_quota_on(struct super_block *sb, int type, int format_id,
188                         const struct path *path);
189
190 static void jfs_quota_off_umount(struct super_block *sb)
191 {
192         int type;
193
194         for (type = 0; type < MAXQUOTAS; type++)
195                 jfs_quota_off(sb, type);
196 }
197
198 static const struct quotactl_ops jfs_quotactl_ops = {
199         .quota_on       = jfs_quota_on,
200         .quota_off      = jfs_quota_off,
201         .quota_sync     = dquot_quota_sync,
202         .get_state      = dquot_get_state,
203         .set_info       = dquot_set_dqinfo,
204         .get_dqblk      = dquot_get_dqblk,
205         .set_dqblk      = dquot_set_dqblk,
206         .get_nextdqblk  = dquot_get_next_dqblk,
207 };
208 #else
209 static inline void jfs_quota_off_umount(struct super_block *sb)
210 {
211 }
212 #endif
213
214 static void jfs_put_super(struct super_block *sb)
215 {
216         struct jfs_sb_info *sbi = JFS_SBI(sb);
217         int rc;
218
219         jfs_info("In jfs_put_super");
220
221         jfs_quota_off_umount(sb);
222
223         rc = jfs_umount(sb);
224         if (rc)
225                 jfs_err("jfs_umount failed with return code %d", rc);
226
227         unload_nls(sbi->nls_tab);
228
229         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
230         iput(sbi->direct_inode);
231
232         kfree(sbi);
233 }
234
235 enum {
236         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
237         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
238         Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask,
239         Opt_discard, Opt_nodiscard, Opt_discard_minblk
240 };
241
242 static const match_table_t tokens = {
243         {Opt_integrity, "integrity"},
244         {Opt_nointegrity, "nointegrity"},
245         {Opt_iocharset, "iocharset=%s"},
246         {Opt_resize, "resize=%u"},
247         {Opt_resize_nosize, "resize"},
248         {Opt_errors, "errors=%s"},
249         {Opt_ignore, "noquota"},
250         {Opt_ignore, "quota"},
251         {Opt_usrquota, "usrquota"},
252         {Opt_grpquota, "grpquota"},
253         {Opt_uid, "uid=%u"},
254         {Opt_gid, "gid=%u"},
255         {Opt_umask, "umask=%u"},
256         {Opt_discard, "discard"},
257         {Opt_nodiscard, "nodiscard"},
258         {Opt_discard_minblk, "discard=%u"},
259         {Opt_err, NULL}
260 };
261
262 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
263                          int *flag)
264 {
265         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
266         char *p;
267         struct jfs_sb_info *sbi = JFS_SBI(sb);
268
269         *newLVSize = 0;
270
271         if (!options)
272                 return 1;
273
274         while ((p = strsep(&options, ",")) != NULL) {
275                 substring_t args[MAX_OPT_ARGS];
276                 int token;
277                 if (!*p)
278                         continue;
279
280                 token = match_token(p, tokens, args);
281                 switch (token) {
282                 case Opt_integrity:
283                         *flag &= ~JFS_NOINTEGRITY;
284                         break;
285                 case Opt_nointegrity:
286                         *flag |= JFS_NOINTEGRITY;
287                         break;
288                 case Opt_ignore:
289                         /* Silently ignore the quota options */
290                         /* Don't do anything ;-) */
291                         break;
292                 case Opt_iocharset:
293                         if (nls_map && nls_map != (void *) -1)
294                                 unload_nls(nls_map);
295                         if (!strcmp(args[0].from, "none"))
296                                 nls_map = NULL;
297                         else {
298                                 nls_map = load_nls(args[0].from);
299                                 if (!nls_map) {
300                                         pr_err("JFS: charset not found\n");
301                                         goto cleanup;
302                                 }
303                         }
304                         break;
305                 case Opt_resize:
306                 {
307                         char *resize = args[0].from;
308                         int rc = kstrtoll(resize, 0, newLVSize);
309
310                         if (rc)
311                                 goto cleanup;
312                         break;
313                 }
314                 case Opt_resize_nosize:
315                 {
316                         *newLVSize = i_size_read(sb->s_bdev->bd_inode) >>
317                                 sb->s_blocksize_bits;
318                         if (*newLVSize == 0)
319                                 pr_err("JFS: Cannot determine volume size\n");
320                         break;
321                 }
322                 case Opt_errors:
323                 {
324                         char *errors = args[0].from;
325                         if (!errors || !*errors)
326                                 goto cleanup;
327                         if (!strcmp(errors, "continue")) {
328                                 *flag &= ~JFS_ERR_REMOUNT_RO;
329                                 *flag &= ~JFS_ERR_PANIC;
330                                 *flag |= JFS_ERR_CONTINUE;
331                         } else if (!strcmp(errors, "remount-ro")) {
332                                 *flag &= ~JFS_ERR_CONTINUE;
333                                 *flag &= ~JFS_ERR_PANIC;
334                                 *flag |= JFS_ERR_REMOUNT_RO;
335                         } else if (!strcmp(errors, "panic")) {
336                                 *flag &= ~JFS_ERR_CONTINUE;
337                                 *flag &= ~JFS_ERR_REMOUNT_RO;
338                                 *flag |= JFS_ERR_PANIC;
339                         } else {
340                                 pr_err("JFS: %s is an invalid error handler\n",
341                                        errors);
342                                 goto cleanup;
343                         }
344                         break;
345                 }
346
347 #ifdef CONFIG_QUOTA
348                 case Opt_quota:
349                 case Opt_usrquota:
350                         *flag |= JFS_USRQUOTA;
351                         break;
352                 case Opt_grpquota:
353                         *flag |= JFS_GRPQUOTA;
354                         break;
355 #else
356                 case Opt_usrquota:
357                 case Opt_grpquota:
358                 case Opt_quota:
359                         pr_err("JFS: quota operations not supported\n");
360                         break;
361 #endif
362                 case Opt_uid:
363                 {
364                         char *uid = args[0].from;
365                         uid_t val;
366                         int rc = kstrtouint(uid, 0, &val);
367
368                         if (rc)
369                                 goto cleanup;
370                         sbi->uid = make_kuid(current_user_ns(), val);
371                         if (!uid_valid(sbi->uid))
372                                 goto cleanup;
373                         break;
374                 }
375
376                 case Opt_gid:
377                 {
378                         char *gid = args[0].from;
379                         gid_t val;
380                         int rc = kstrtouint(gid, 0, &val);
381
382                         if (rc)
383                                 goto cleanup;
384                         sbi->gid = make_kgid(current_user_ns(), val);
385                         if (!gid_valid(sbi->gid))
386                                 goto cleanup;
387                         break;
388                 }
389
390                 case Opt_umask:
391                 {
392                         char *umask = args[0].from;
393                         int rc = kstrtouint(umask, 8, &sbi->umask);
394
395                         if (rc)
396                                 goto cleanup;
397                         if (sbi->umask & ~0777) {
398                                 pr_err("JFS: Invalid value of umask\n");
399                                 goto cleanup;
400                         }
401                         break;
402                 }
403
404                 case Opt_discard:
405                 {
406                         struct request_queue *q = bdev_get_queue(sb->s_bdev);
407                         /* if set to 1, even copying files will cause
408                          * trimming :O
409                          * -> user has more control over the online trimming
410                          */
411                         sbi->minblks_trim = 64;
412                         if (blk_queue_discard(q))
413                                 *flag |= JFS_DISCARD;
414                         else
415                                 pr_err("JFS: discard option not supported on device\n");
416                         break;
417                 }
418
419                 case Opt_nodiscard:
420                         *flag &= ~JFS_DISCARD;
421                         break;
422
423                 case Opt_discard_minblk:
424                 {
425                         struct request_queue *q = bdev_get_queue(sb->s_bdev);
426                         char *minblks_trim = args[0].from;
427                         int rc;
428                         if (blk_queue_discard(q)) {
429                                 *flag |= JFS_DISCARD;
430                                 rc = kstrtouint(minblks_trim, 0,
431                                                 &sbi->minblks_trim);
432                                 if (rc)
433                                         goto cleanup;
434                         } else
435                                 pr_err("JFS: discard option not supported on device\n");
436                         break;
437                 }
438
439                 default:
440                         printk("jfs: Unrecognized mount option \"%s\" or missing value\n",
441                                p);
442                         goto cleanup;
443                 }
444         }
445
446         if (nls_map != (void *) -1) {
447                 /* Discard old (if remount) */
448                 unload_nls(sbi->nls_tab);
449                 sbi->nls_tab = nls_map;
450         }
451         return 1;
452
453 cleanup:
454         if (nls_map && nls_map != (void *) -1)
455                 unload_nls(nls_map);
456         return 0;
457 }
458
459 static int jfs_remount(struct super_block *sb, int *flags, char *data)
460 {
461         s64 newLVSize = 0;
462         int rc = 0;
463         int flag = JFS_SBI(sb)->flag;
464         int ret;
465
466         sync_filesystem(sb);
467         if (!parse_options(data, sb, &newLVSize, &flag))
468                 return -EINVAL;
469
470         if (newLVSize) {
471                 if (sb->s_flags & MS_RDONLY) {
472                         pr_err("JFS: resize requires volume to be mounted read-write\n");
473                         return -EROFS;
474                 }
475                 rc = jfs_extendfs(sb, newLVSize, 0);
476                 if (rc)
477                         return rc;
478         }
479
480         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
481                 /*
482                  * Invalidate any previously read metadata.  fsck may have
483                  * changed the on-disk data since we mounted r/o
484                  */
485                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
486
487                 JFS_SBI(sb)->flag = flag;
488                 ret = jfs_mount_rw(sb, 1);
489
490                 /* mark the fs r/w for quota activity */
491                 sb->s_flags &= ~MS_RDONLY;
492
493                 dquot_resume(sb, -1);
494                 return ret;
495         }
496         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
497                 rc = dquot_suspend(sb, -1);
498                 if (rc < 0)
499                         return rc;
500                 rc = jfs_umount_rw(sb);
501                 JFS_SBI(sb)->flag = flag;
502                 return rc;
503         }
504         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
505                 if (!(sb->s_flags & MS_RDONLY)) {
506                         rc = jfs_umount_rw(sb);
507                         if (rc)
508                                 return rc;
509
510                         JFS_SBI(sb)->flag = flag;
511                         ret = jfs_mount_rw(sb, 1);
512                         return ret;
513                 }
514         JFS_SBI(sb)->flag = flag;
515
516         return 0;
517 }
518
519 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
520 {
521         struct jfs_sb_info *sbi;
522         struct inode *inode;
523         int rc;
524         s64 newLVSize = 0;
525         int flag, ret = -EINVAL;
526
527         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
528
529         sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL);
530         if (!sbi)
531                 return -ENOMEM;
532
533         sb->s_fs_info = sbi;
534         sb->s_max_links = JFS_LINK_MAX;
535         sbi->sb = sb;
536         sbi->uid = INVALID_UID;
537         sbi->gid = INVALID_GID;
538         sbi->umask = -1;
539
540         /* initialize the mount flag and determine the default error handler */
541         flag = JFS_ERR_REMOUNT_RO;
542
543         if (!parse_options((char *) data, sb, &newLVSize, &flag))
544                 goto out_kfree;
545         sbi->flag = flag;
546
547 #ifdef CONFIG_JFS_POSIX_ACL
548         sb->s_flags |= MS_POSIXACL;
549 #endif
550
551         if (newLVSize) {
552                 pr_err("resize option for remount only\n");
553                 goto out_kfree;
554         }
555
556         /*
557          * Initialize blocksize to 4K.
558          */
559         sb_set_blocksize(sb, PSIZE);
560
561         /*
562          * Set method vectors.
563          */
564         sb->s_op = &jfs_super_operations;
565         sb->s_export_op = &jfs_export_operations;
566         sb->s_xattr = jfs_xattr_handlers;
567 #ifdef CONFIG_QUOTA
568         sb->dq_op = &dquot_operations;
569         sb->s_qcop = &jfs_quotactl_ops;
570         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
571 #endif
572
573         /*
574          * Initialize direct-mapping inode/address-space
575          */
576         inode = new_inode(sb);
577         if (inode == NULL) {
578                 ret = -ENOMEM;
579                 goto out_unload;
580         }
581         inode->i_ino = 0;
582         inode->i_size = i_size_read(sb->s_bdev->bd_inode);
583         inode->i_mapping->a_ops = &jfs_metapage_aops;
584         hlist_add_fake(&inode->i_hash);
585         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
586
587         sbi->direct_inode = inode;
588
589         rc = jfs_mount(sb);
590         if (rc) {
591                 if (!silent)
592                         jfs_err("jfs_mount failed w/return code = %d", rc);
593                 goto out_mount_failed;
594         }
595         if (sb->s_flags & MS_RDONLY)
596                 sbi->log = NULL;
597         else {
598                 rc = jfs_mount_rw(sb, 0);
599                 if (rc) {
600                         if (!silent) {
601                                 jfs_err("jfs_mount_rw failed, return code = %d",
602                                         rc);
603                         }
604                         goto out_no_rw;
605                 }
606         }
607
608         sb->s_magic = JFS_SUPER_MAGIC;
609
610         if (sbi->mntflag & JFS_OS2)
611                 sb->s_d_op = &jfs_ci_dentry_operations;
612
613         inode = jfs_iget(sb, ROOT_I);
614         if (IS_ERR(inode)) {
615                 ret = PTR_ERR(inode);
616                 goto out_no_rw;
617         }
618         sb->s_root = d_make_root(inode);
619         if (!sb->s_root)
620                 goto out_no_root;
621
622         /* logical blocks are represented by 40 bits in pxd_t, etc. */
623         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
624 #if BITS_PER_LONG == 32
625         /*
626          * Page cache is indexed by long.
627          * I would use MAX_LFS_FILESIZE, but it's only half as big
628          */
629         sb->s_maxbytes = min(((u64) PAGE_SIZE << 32) - 1,
630                              (u64)sb->s_maxbytes);
631 #endif
632         sb->s_time_gran = 1;
633         return 0;
634
635 out_no_root:
636         jfs_err("jfs_read_super: get root dentry failed");
637
638 out_no_rw:
639         rc = jfs_umount(sb);
640         if (rc)
641                 jfs_err("jfs_umount failed with return code %d", rc);
642 out_mount_failed:
643         filemap_write_and_wait(sbi->direct_inode->i_mapping);
644         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
645         make_bad_inode(sbi->direct_inode);
646         iput(sbi->direct_inode);
647         sbi->direct_inode = NULL;
648 out_unload:
649         unload_nls(sbi->nls_tab);
650 out_kfree:
651         kfree(sbi);
652         return ret;
653 }
654
655 static int jfs_freeze(struct super_block *sb)
656 {
657         struct jfs_sb_info *sbi = JFS_SBI(sb);
658         struct jfs_log *log = sbi->log;
659         int rc = 0;
660
661         if (!(sb->s_flags & MS_RDONLY)) {
662                 txQuiesce(sb);
663                 rc = lmLogShutdown(log);
664                 if (rc) {
665                         jfs_error(sb, "lmLogShutdown failed\n");
666
667                         /* let operations fail rather than hang */
668                         txResume(sb);
669
670                         return rc;
671                 }
672                 rc = updateSuper(sb, FM_CLEAN);
673                 if (rc) {
674                         jfs_err("jfs_freeze: updateSuper failed");
675                         /*
676                          * Don't fail here. Everything succeeded except
677                          * marking the superblock clean, so there's really
678                          * no harm in leaving it frozen for now.
679                          */
680                 }
681         }
682         return 0;
683 }
684
685 static int jfs_unfreeze(struct super_block *sb)
686 {
687         struct jfs_sb_info *sbi = JFS_SBI(sb);
688         struct jfs_log *log = sbi->log;
689         int rc = 0;
690
691         if (!(sb->s_flags & MS_RDONLY)) {
692                 rc = updateSuper(sb, FM_MOUNT);
693                 if (rc) {
694                         jfs_error(sb, "updateSuper failed\n");
695                         goto out;
696                 }
697                 rc = lmLogInit(log);
698                 if (rc)
699                         jfs_error(sb, "lmLogInit failed\n");
700 out:
701                 txResume(sb);
702         }
703         return rc;
704 }
705
706 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
707         int flags, const char *dev_name, void *data)
708 {
709         return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
710 }
711
712 static int jfs_sync_fs(struct super_block *sb, int wait)
713 {
714         struct jfs_log *log = JFS_SBI(sb)->log;
715
716         /* log == NULL indicates read-only mount */
717         if (log) {
718                 /*
719                  * Write quota structures to quota file, sync_blockdev() will
720                  * write them to disk later
721                  */
722                 dquot_writeback_dquots(sb, -1);
723                 jfs_flush_journal(log, wait);
724                 jfs_syncpt(log, 0);
725         }
726
727         return 0;
728 }
729
730 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
731 {
732         struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
733
734         if (uid_valid(sbi->uid))
735                 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
736         if (gid_valid(sbi->gid))
737                 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
738         if (sbi->umask != -1)
739                 seq_printf(seq, ",umask=%03o", sbi->umask);
740         if (sbi->flag & JFS_NOINTEGRITY)
741                 seq_puts(seq, ",nointegrity");
742         if (sbi->flag & JFS_DISCARD)
743                 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
744         if (sbi->nls_tab)
745                 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
746         if (sbi->flag & JFS_ERR_CONTINUE)
747                 seq_printf(seq, ",errors=continue");
748         if (sbi->flag & JFS_ERR_PANIC)
749                 seq_printf(seq, ",errors=panic");
750
751 #ifdef CONFIG_QUOTA
752         if (sbi->flag & JFS_USRQUOTA)
753                 seq_puts(seq, ",usrquota");
754
755         if (sbi->flag & JFS_GRPQUOTA)
756                 seq_puts(seq, ",grpquota");
757 #endif
758
759         return 0;
760 }
761
762 #ifdef CONFIG_QUOTA
763
764 /* Read data from quotafile - avoid pagecache and such because we cannot afford
765  * acquiring the locks... As quota files are never truncated and quota code
766  * itself serializes the operations (and no one else should touch the files)
767  * we don't have to be afraid of races */
768 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
769                               size_t len, loff_t off)
770 {
771         struct inode *inode = sb_dqopt(sb)->files[type];
772         sector_t blk = off >> sb->s_blocksize_bits;
773         int err = 0;
774         int offset = off & (sb->s_blocksize - 1);
775         int tocopy;
776         size_t toread;
777         struct buffer_head tmp_bh;
778         struct buffer_head *bh;
779         loff_t i_size = i_size_read(inode);
780
781         if (off > i_size)
782                 return 0;
783         if (off+len > i_size)
784                 len = i_size-off;
785         toread = len;
786         while (toread > 0) {
787                 tocopy = sb->s_blocksize - offset < toread ?
788                                 sb->s_blocksize - offset : toread;
789
790                 tmp_bh.b_state = 0;
791                 tmp_bh.b_size = i_blocksize(inode);
792                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
793                 if (err)
794                         return err;
795                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
796                         memset(data, 0, tocopy);
797                 else {
798                         bh = sb_bread(sb, tmp_bh.b_blocknr);
799                         if (!bh)
800                                 return -EIO;
801                         memcpy(data, bh->b_data+offset, tocopy);
802                         brelse(bh);
803                 }
804                 offset = 0;
805                 toread -= tocopy;
806                 data += tocopy;
807                 blk++;
808         }
809         return len;
810 }
811
812 /* Write to quotafile */
813 static ssize_t jfs_quota_write(struct super_block *sb, int type,
814                                const char *data, size_t len, loff_t off)
815 {
816         struct inode *inode = sb_dqopt(sb)->files[type];
817         sector_t blk = off >> sb->s_blocksize_bits;
818         int err = 0;
819         int offset = off & (sb->s_blocksize - 1);
820         int tocopy;
821         size_t towrite = len;
822         struct buffer_head tmp_bh;
823         struct buffer_head *bh;
824
825         inode_lock(inode);
826         while (towrite > 0) {
827                 tocopy = sb->s_blocksize - offset < towrite ?
828                                 sb->s_blocksize - offset : towrite;
829
830                 tmp_bh.b_state = 0;
831                 tmp_bh.b_size = i_blocksize(inode);
832                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
833                 if (err)
834                         goto out;
835                 if (offset || tocopy != sb->s_blocksize)
836                         bh = sb_bread(sb, tmp_bh.b_blocknr);
837                 else
838                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
839                 if (!bh) {
840                         err = -EIO;
841                         goto out;
842                 }
843                 lock_buffer(bh);
844                 memcpy(bh->b_data+offset, data, tocopy);
845                 flush_dcache_page(bh->b_page);
846                 set_buffer_uptodate(bh);
847                 mark_buffer_dirty(bh);
848                 unlock_buffer(bh);
849                 brelse(bh);
850                 offset = 0;
851                 towrite -= tocopy;
852                 data += tocopy;
853                 blk++;
854         }
855 out:
856         if (len == towrite) {
857                 inode_unlock(inode);
858                 return err;
859         }
860         if (inode->i_size < off+len-towrite)
861                 i_size_write(inode, off+len-towrite);
862         inode->i_version++;
863         inode->i_mtime = inode->i_ctime = current_time(inode);
864         mark_inode_dirty(inode);
865         inode_unlock(inode);
866         return len - towrite;
867 }
868
869 static struct dquot **jfs_get_dquots(struct inode *inode)
870 {
871         return JFS_IP(inode)->i_dquot;
872 }
873
874 static int jfs_quota_on(struct super_block *sb, int type, int format_id,
875                         const struct path *path)
876 {
877         int err;
878         struct inode *inode;
879
880         err = dquot_quota_on(sb, type, format_id, path);
881         if (err)
882                 return err;
883
884         inode = d_inode(path->dentry);
885         inode_lock(inode);
886         JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL;
887         inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
888                         S_NOATIME | S_IMMUTABLE);
889         inode_unlock(inode);
890         mark_inode_dirty(inode);
891
892         return 0;
893 }
894
895 static int jfs_quota_off(struct super_block *sb, int type)
896 {
897         struct inode *inode = sb_dqopt(sb)->files[type];
898         int err;
899
900         if (!inode || !igrab(inode))
901                 goto out;
902
903         err = dquot_quota_off(sb, type);
904         if (err)
905                 goto out_put;
906
907         inode_lock(inode);
908         JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL);
909         inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
910         inode_unlock(inode);
911         mark_inode_dirty(inode);
912 out_put:
913         iput(inode);
914         return err;
915 out:
916         return dquot_quota_off(sb, type);
917 }
918 #endif
919
920 static const struct super_operations jfs_super_operations = {
921         .alloc_inode    = jfs_alloc_inode,
922         .destroy_inode  = jfs_destroy_inode,
923         .dirty_inode    = jfs_dirty_inode,
924         .write_inode    = jfs_write_inode,
925         .evict_inode    = jfs_evict_inode,
926         .put_super      = jfs_put_super,
927         .sync_fs        = jfs_sync_fs,
928         .freeze_fs      = jfs_freeze,
929         .unfreeze_fs    = jfs_unfreeze,
930         .statfs         = jfs_statfs,
931         .remount_fs     = jfs_remount,
932         .show_options   = jfs_show_options,
933 #ifdef CONFIG_QUOTA
934         .quota_read     = jfs_quota_read,
935         .quota_write    = jfs_quota_write,
936         .get_dquots     = jfs_get_dquots,
937 #endif
938 };
939
940 static const struct export_operations jfs_export_operations = {
941         .fh_to_dentry   = jfs_fh_to_dentry,
942         .fh_to_parent   = jfs_fh_to_parent,
943         .get_parent     = jfs_get_parent,
944 };
945
946 static struct file_system_type jfs_fs_type = {
947         .owner          = THIS_MODULE,
948         .name           = "jfs",
949         .mount          = jfs_do_mount,
950         .kill_sb        = kill_block_super,
951         .fs_flags       = FS_REQUIRES_DEV,
952 };
953 MODULE_ALIAS_FS("jfs");
954
955 static void init_once(void *foo)
956 {
957         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
958
959         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
960         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
961         init_rwsem(&jfs_ip->rdwrlock);
962         mutex_init(&jfs_ip->commit_mutex);
963         init_rwsem(&jfs_ip->xattr_sem);
964         spin_lock_init(&jfs_ip->ag_lock);
965         jfs_ip->active_ag = -1;
966         inode_init_once(&jfs_ip->vfs_inode);
967 }
968
969 static int __init init_jfs_fs(void)
970 {
971         int i;
972         int rc;
973
974         jfs_inode_cachep =
975             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
976                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
977                             init_once);
978         if (jfs_inode_cachep == NULL)
979                 return -ENOMEM;
980
981         /*
982          * Metapage initialization
983          */
984         rc = metapage_init();
985         if (rc) {
986                 jfs_err("metapage_init failed w/rc = %d", rc);
987                 goto free_slab;
988         }
989
990         /*
991          * Transaction Manager initialization
992          */
993         rc = txInit();
994         if (rc) {
995                 jfs_err("txInit failed w/rc = %d", rc);
996                 goto free_metapage;
997         }
998
999         /*
1000          * I/O completion thread (endio)
1001          */
1002         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
1003         if (IS_ERR(jfsIOthread)) {
1004                 rc = PTR_ERR(jfsIOthread);
1005                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
1006                 goto end_txmngr;
1007         }
1008
1009         if (commit_threads < 1)
1010                 commit_threads = num_online_cpus();
1011         if (commit_threads > MAX_COMMIT_THREADS)
1012                 commit_threads = MAX_COMMIT_THREADS;
1013
1014         for (i = 0; i < commit_threads; i++) {
1015                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
1016                                                  "jfsCommit");
1017                 if (IS_ERR(jfsCommitThread[i])) {
1018                         rc = PTR_ERR(jfsCommitThread[i]);
1019                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
1020                         commit_threads = i;
1021                         goto kill_committask;
1022                 }
1023         }
1024
1025         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
1026         if (IS_ERR(jfsSyncThread)) {
1027                 rc = PTR_ERR(jfsSyncThread);
1028                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
1029                 goto kill_committask;
1030         }
1031
1032 #ifdef PROC_FS_JFS
1033         jfs_proc_init();
1034 #endif
1035
1036         rc = register_filesystem(&jfs_fs_type);
1037         if (!rc)
1038                 return 0;
1039
1040 #ifdef PROC_FS_JFS
1041         jfs_proc_clean();
1042 #endif
1043         kthread_stop(jfsSyncThread);
1044 kill_committask:
1045         for (i = 0; i < commit_threads; i++)
1046                 kthread_stop(jfsCommitThread[i]);
1047         kthread_stop(jfsIOthread);
1048 end_txmngr:
1049         txExit();
1050 free_metapage:
1051         metapage_exit();
1052 free_slab:
1053         kmem_cache_destroy(jfs_inode_cachep);
1054         return rc;
1055 }
1056
1057 static void __exit exit_jfs_fs(void)
1058 {
1059         int i;
1060
1061         jfs_info("exit_jfs_fs called");
1062
1063         txExit();
1064         metapage_exit();
1065
1066         kthread_stop(jfsIOthread);
1067         for (i = 0; i < commit_threads; i++)
1068                 kthread_stop(jfsCommitThread[i]);
1069         kthread_stop(jfsSyncThread);
1070 #ifdef PROC_FS_JFS
1071         jfs_proc_clean();
1072 #endif
1073         unregister_filesystem(&jfs_fs_type);
1074
1075         /*
1076          * Make sure all delayed rcu free inodes are flushed before we
1077          * destroy cache.
1078          */
1079         rcu_barrier();
1080         kmem_cache_destroy(jfs_inode_cachep);
1081 }
1082
1083 module_init(init_jfs_fs)
1084 module_exit(exit_jfs_fs)