push BKL down into ->put_super
[linux-3.10.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 <asm/uaccess.h>
34 #include <linux/seq_file.h>
35
36 #include "jfs_incore.h"
37 #include "jfs_filsys.h"
38 #include "jfs_inode.h"
39 #include "jfs_metapage.h"
40 #include "jfs_superblock.h"
41 #include "jfs_dmap.h"
42 #include "jfs_imap.h"
43 #include "jfs_acl.h"
44 #include "jfs_debug.h"
45
46 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
47 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
48 MODULE_LICENSE("GPL");
49
50 static struct kmem_cache * jfs_inode_cachep;
51
52 static const struct super_operations jfs_super_operations;
53 static const struct export_operations jfs_export_operations;
54 static struct file_system_type jfs_fs_type;
55
56 #define MAX_COMMIT_THREADS 64
57 static int commit_threads = 0;
58 module_param(commit_threads, int, 0);
59 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
60
61 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
62 struct task_struct *jfsIOthread;
63 struct task_struct *jfsSyncThread;
64
65 #ifdef CONFIG_JFS_DEBUG
66 int jfsloglevel = JFS_LOGLEVEL_WARN;
67 module_param(jfsloglevel, int, 0644);
68 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
69 #endif
70
71 static void jfs_handle_error(struct super_block *sb)
72 {
73         struct jfs_sb_info *sbi = JFS_SBI(sb);
74
75         if (sb->s_flags & MS_RDONLY)
76                 return;
77
78         updateSuper(sb, FM_DIRTY);
79
80         if (sbi->flag & JFS_ERR_PANIC)
81                 panic("JFS (device %s): panic forced after error\n",
82                         sb->s_id);
83         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
84                 jfs_err("ERROR: (device %s): remounting filesystem "
85                         "as read-only\n",
86                         sb->s_id);
87                 sb->s_flags |= MS_RDONLY;
88         }
89
90         /* nothing is done for continue beyond marking the superblock dirty */
91 }
92
93 void jfs_error(struct super_block *sb, const char * function, ...)
94 {
95         static char error_buf[256];
96         va_list args;
97
98         va_start(args, function);
99         vsnprintf(error_buf, sizeof(error_buf), function, args);
100         va_end(args);
101
102         printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
103
104         jfs_handle_error(sb);
105 }
106
107 static struct inode *jfs_alloc_inode(struct super_block *sb)
108 {
109         struct jfs_inode_info *jfs_inode;
110
111         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
112         if (!jfs_inode)
113                 return NULL;
114         return &jfs_inode->vfs_inode;
115 }
116
117 static void jfs_destroy_inode(struct inode *inode)
118 {
119         struct jfs_inode_info *ji = JFS_IP(inode);
120
121         BUG_ON(!list_empty(&ji->anon_inode_list));
122
123         spin_lock_irq(&ji->ag_lock);
124         if (ji->active_ag != -1) {
125                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
126                 atomic_dec(&bmap->db_active[ji->active_ag]);
127                 ji->active_ag = -1;
128         }
129         spin_unlock_irq(&ji->ag_lock);
130
131 #ifdef CONFIG_JFS_POSIX_ACL
132         if (ji->i_acl != JFS_ACL_NOT_CACHED) {
133                 posix_acl_release(ji->i_acl);
134                 ji->i_acl = JFS_ACL_NOT_CACHED;
135         }
136         if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
137                 posix_acl_release(ji->i_default_acl);
138                 ji->i_default_acl = JFS_ACL_NOT_CACHED;
139         }
140 #endif
141
142         kmem_cache_free(jfs_inode_cachep, ji);
143 }
144
145 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
146 {
147         struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
148         s64 maxinodes;
149         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
150
151         jfs_info("In jfs_statfs");
152         buf->f_type = JFS_SUPER_MAGIC;
153         buf->f_bsize = sbi->bsize;
154         buf->f_blocks = sbi->bmap->db_mapsize;
155         buf->f_bfree = sbi->bmap->db_nfree;
156         buf->f_bavail = sbi->bmap->db_nfree;
157         /*
158          * If we really return the number of allocated & free inodes, some
159          * applications will fail because they won't see enough free inodes.
160          * We'll try to calculate some guess as to how may inodes we can
161          * really allocate
162          *
163          * buf->f_files = atomic_read(&imap->im_numinos);
164          * buf->f_ffree = atomic_read(&imap->im_numfree);
165          */
166         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
167                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
168                          << L2INOSPEREXT), (s64) 0xffffffffLL);
169         buf->f_files = maxinodes;
170         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
171                                     atomic_read(&imap->im_numfree));
172         buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
173         buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
174                                         sizeof(sbi->uuid)/2);
175
176         buf->f_namelen = JFS_NAME_MAX;
177         return 0;
178 }
179
180 static void jfs_put_super(struct super_block *sb)
181 {
182         struct jfs_sb_info *sbi = JFS_SBI(sb);
183         int rc;
184
185         jfs_info("In jfs_put_super");
186
187         lock_kernel();
188
189         rc = jfs_umount(sb);
190         if (rc)
191                 jfs_err("jfs_umount failed with return code %d", rc);
192         if (sbi->nls_tab)
193                 unload_nls(sbi->nls_tab);
194         sbi->nls_tab = NULL;
195
196         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
197         iput(sbi->direct_inode);
198         sbi->direct_inode = NULL;
199
200         kfree(sbi);
201
202         unlock_kernel();
203 }
204
205 enum {
206         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
207         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
208         Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask
209 };
210
211 static const match_table_t tokens = {
212         {Opt_integrity, "integrity"},
213         {Opt_nointegrity, "nointegrity"},
214         {Opt_iocharset, "iocharset=%s"},
215         {Opt_resize, "resize=%u"},
216         {Opt_resize_nosize, "resize"},
217         {Opt_errors, "errors=%s"},
218         {Opt_ignore, "noquota"},
219         {Opt_ignore, "quota"},
220         {Opt_usrquota, "usrquota"},
221         {Opt_grpquota, "grpquota"},
222         {Opt_uid, "uid=%u"},
223         {Opt_gid, "gid=%u"},
224         {Opt_umask, "umask=%u"},
225         {Opt_err, NULL}
226 };
227
228 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
229                          int *flag)
230 {
231         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
232         char *p;
233         struct jfs_sb_info *sbi = JFS_SBI(sb);
234
235         *newLVSize = 0;
236
237         if (!options)
238                 return 1;
239
240         while ((p = strsep(&options, ",")) != NULL) {
241                 substring_t args[MAX_OPT_ARGS];
242                 int token;
243                 if (!*p)
244                         continue;
245
246                 token = match_token(p, tokens, args);
247                 switch (token) {
248                 case Opt_integrity:
249                         *flag &= ~JFS_NOINTEGRITY;
250                         break;
251                 case Opt_nointegrity:
252                         *flag |= JFS_NOINTEGRITY;
253                         break;
254                 case Opt_ignore:
255                         /* Silently ignore the quota options */
256                         /* Don't do anything ;-) */
257                         break;
258                 case Opt_iocharset:
259                         if (nls_map && nls_map != (void *) -1)
260                                 unload_nls(nls_map);
261                         if (!strcmp(args[0].from, "none"))
262                                 nls_map = NULL;
263                         else {
264                                 nls_map = load_nls(args[0].from);
265                                 if (!nls_map) {
266                                         printk(KERN_ERR
267                                                "JFS: charset not found\n");
268                                         goto cleanup;
269                                 }
270                         }
271                         break;
272                 case Opt_resize:
273                 {
274                         char *resize = args[0].from;
275                         *newLVSize = simple_strtoull(resize, &resize, 0);
276                         break;
277                 }
278                 case Opt_resize_nosize:
279                 {
280                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
281                                 sb->s_blocksize_bits;
282                         if (*newLVSize == 0)
283                                 printk(KERN_ERR
284                                        "JFS: Cannot determine volume size\n");
285                         break;
286                 }
287                 case Opt_errors:
288                 {
289                         char *errors = args[0].from;
290                         if (!errors || !*errors)
291                                 goto cleanup;
292                         if (!strcmp(errors, "continue")) {
293                                 *flag &= ~JFS_ERR_REMOUNT_RO;
294                                 *flag &= ~JFS_ERR_PANIC;
295                                 *flag |= JFS_ERR_CONTINUE;
296                         } else if (!strcmp(errors, "remount-ro")) {
297                                 *flag &= ~JFS_ERR_CONTINUE;
298                                 *flag &= ~JFS_ERR_PANIC;
299                                 *flag |= JFS_ERR_REMOUNT_RO;
300                         } else if (!strcmp(errors, "panic")) {
301                                 *flag &= ~JFS_ERR_CONTINUE;
302                                 *flag &= ~JFS_ERR_REMOUNT_RO;
303                                 *flag |= JFS_ERR_PANIC;
304                         } else {
305                                 printk(KERN_ERR
306                                        "JFS: %s is an invalid error handler\n",
307                                        errors);
308                                 goto cleanup;
309                         }
310                         break;
311                 }
312
313 #ifdef CONFIG_QUOTA
314                 case Opt_quota:
315                 case Opt_usrquota:
316                         *flag |= JFS_USRQUOTA;
317                         break;
318                 case Opt_grpquota:
319                         *flag |= JFS_GRPQUOTA;
320                         break;
321 #else
322                 case Opt_usrquota:
323                 case Opt_grpquota:
324                 case Opt_quota:
325                         printk(KERN_ERR
326                                "JFS: quota operations not supported\n");
327                         break;
328 #endif
329                 case Opt_uid:
330                 {
331                         char *uid = args[0].from;
332                         sbi->uid = simple_strtoul(uid, &uid, 0);
333                         break;
334                 }
335                 case Opt_gid:
336                 {
337                         char *gid = args[0].from;
338                         sbi->gid = simple_strtoul(gid, &gid, 0);
339                         break;
340                 }
341                 case Opt_umask:
342                 {
343                         char *umask = args[0].from;
344                         sbi->umask = simple_strtoul(umask, &umask, 8);
345                         if (sbi->umask & ~0777) {
346                                 printk(KERN_ERR
347                                        "JFS: Invalid value of umask\n");
348                                 goto cleanup;
349                         }
350                         break;
351                 }
352                 default:
353                         printk("jfs: Unrecognized mount option \"%s\" "
354                                         " or missing value\n", p);
355                         goto cleanup;
356                 }
357         }
358
359         if (nls_map != (void *) -1) {
360                 /* Discard old (if remount) */
361                 if (sbi->nls_tab)
362                         unload_nls(sbi->nls_tab);
363                 sbi->nls_tab = nls_map;
364         }
365         return 1;
366
367 cleanup:
368         if (nls_map && nls_map != (void *) -1)
369                 unload_nls(nls_map);
370         return 0;
371 }
372
373 static int jfs_remount(struct super_block *sb, int *flags, char *data)
374 {
375         s64 newLVSize = 0;
376         int rc = 0;
377         int flag = JFS_SBI(sb)->flag;
378
379         if (!parse_options(data, sb, &newLVSize, &flag)) {
380                 return -EINVAL;
381         }
382         if (newLVSize) {
383                 if (sb->s_flags & MS_RDONLY) {
384                         printk(KERN_ERR
385                   "JFS: resize requires volume to be mounted read-write\n");
386                         return -EROFS;
387                 }
388                 rc = jfs_extendfs(sb, newLVSize, 0);
389                 if (rc)
390                         return rc;
391         }
392
393         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
394                 /*
395                  * Invalidate any previously read metadata.  fsck may have
396                  * changed the on-disk data since we mounted r/o
397                  */
398                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
399
400                 JFS_SBI(sb)->flag = flag;
401                 return jfs_mount_rw(sb, 1);
402         }
403         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
404                 rc = jfs_umount_rw(sb);
405                 JFS_SBI(sb)->flag = flag;
406                 return rc;
407         }
408         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
409                 if (!(sb->s_flags & MS_RDONLY)) {
410                         rc = jfs_umount_rw(sb);
411                         if (rc)
412                                 return rc;
413                         JFS_SBI(sb)->flag = flag;
414                         return jfs_mount_rw(sb, 1);
415                 }
416         JFS_SBI(sb)->flag = flag;
417
418         return 0;
419 }
420
421 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
422 {
423         struct jfs_sb_info *sbi;
424         struct inode *inode;
425         int rc;
426         s64 newLVSize = 0;
427         int flag, ret = -EINVAL;
428
429         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
430
431         if (!new_valid_dev(sb->s_bdev->bd_dev))
432                 return -EOVERFLOW;
433
434         sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
435         if (!sbi)
436                 return -ENOMEM;
437         sb->s_fs_info = sbi;
438         sbi->sb = sb;
439         sbi->uid = sbi->gid = sbi->umask = -1;
440
441         /* initialize the mount flag and determine the default error handler */
442         flag = JFS_ERR_REMOUNT_RO;
443
444         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
445                 kfree(sbi);
446                 return -EINVAL;
447         }
448         sbi->flag = flag;
449
450 #ifdef CONFIG_JFS_POSIX_ACL
451         sb->s_flags |= MS_POSIXACL;
452 #endif
453
454         if (newLVSize) {
455                 printk(KERN_ERR "resize option for remount only\n");
456                 return -EINVAL;
457         }
458
459         /*
460          * Initialize blocksize to 4K.
461          */
462         sb_set_blocksize(sb, PSIZE);
463
464         /*
465          * Set method vectors.
466          */
467         sb->s_op = &jfs_super_operations;
468         sb->s_export_op = &jfs_export_operations;
469
470         /*
471          * Initialize direct-mapping inode/address-space
472          */
473         inode = new_inode(sb);
474         if (inode == NULL) {
475                 ret = -ENOMEM;
476                 goto out_kfree;
477         }
478         inode->i_ino = 0;
479         inode->i_nlink = 1;
480         inode->i_size = sb->s_bdev->bd_inode->i_size;
481         inode->i_mapping->a_ops = &jfs_metapage_aops;
482         insert_inode_hash(inode);
483         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
484
485         sbi->direct_inode = inode;
486
487         rc = jfs_mount(sb);
488         if (rc) {
489                 if (!silent) {
490                         jfs_err("jfs_mount failed w/return code = %d", rc);
491                 }
492                 goto out_mount_failed;
493         }
494         if (sb->s_flags & MS_RDONLY)
495                 sbi->log = NULL;
496         else {
497                 rc = jfs_mount_rw(sb, 0);
498                 if (rc) {
499                         if (!silent) {
500                                 jfs_err("jfs_mount_rw failed, return code = %d",
501                                         rc);
502                         }
503                         goto out_no_rw;
504                 }
505         }
506
507         sb->s_magic = JFS_SUPER_MAGIC;
508
509         inode = jfs_iget(sb, ROOT_I);
510         if (IS_ERR(inode)) {
511                 ret = PTR_ERR(inode);
512                 goto out_no_rw;
513         }
514         sb->s_root = d_alloc_root(inode);
515         if (!sb->s_root)
516                 goto out_no_root;
517
518         if (sbi->mntflag & JFS_OS2)
519                 sb->s_root->d_op = &jfs_ci_dentry_operations;
520
521         /* logical blocks are represented by 40 bits in pxd_t, etc. */
522         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
523 #if BITS_PER_LONG == 32
524         /*
525          * Page cache is indexed by long.
526          * I would use MAX_LFS_FILESIZE, but it's only half as big
527          */
528         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
529 #endif
530         sb->s_time_gran = 1;
531         return 0;
532
533 out_no_root:
534         jfs_err("jfs_read_super: get root dentry failed");
535         iput(inode);
536
537 out_no_rw:
538         rc = jfs_umount(sb);
539         if (rc) {
540                 jfs_err("jfs_umount failed with return code %d", rc);
541         }
542 out_mount_failed:
543         filemap_write_and_wait(sbi->direct_inode->i_mapping);
544         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
545         make_bad_inode(sbi->direct_inode);
546         iput(sbi->direct_inode);
547         sbi->direct_inode = NULL;
548 out_kfree:
549         if (sbi->nls_tab)
550                 unload_nls(sbi->nls_tab);
551         kfree(sbi);
552         return ret;
553 }
554
555 static int jfs_freeze(struct super_block *sb)
556 {
557         struct jfs_sb_info *sbi = JFS_SBI(sb);
558         struct jfs_log *log = sbi->log;
559
560         if (!(sb->s_flags & MS_RDONLY)) {
561                 txQuiesce(sb);
562                 lmLogShutdown(log);
563                 updateSuper(sb, FM_CLEAN);
564         }
565         return 0;
566 }
567
568 static int jfs_unfreeze(struct super_block *sb)
569 {
570         struct jfs_sb_info *sbi = JFS_SBI(sb);
571         struct jfs_log *log = sbi->log;
572         int rc = 0;
573
574         if (!(sb->s_flags & MS_RDONLY)) {
575                 updateSuper(sb, FM_MOUNT);
576                 if ((rc = lmLogInit(log)))
577                         jfs_err("jfs_unlock failed with return code %d", rc);
578                 else
579                         txResume(sb);
580         }
581         return 0;
582 }
583
584 static int jfs_get_sb(struct file_system_type *fs_type,
585         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
586 {
587         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
588                            mnt);
589 }
590
591 static int jfs_sync_fs(struct super_block *sb, int wait)
592 {
593         struct jfs_log *log = JFS_SBI(sb)->log;
594
595         /* log == NULL indicates read-only mount */
596         if (log) {
597                 jfs_flush_journal(log, wait);
598                 jfs_syncpt(log, 0);
599         }
600
601         return 0;
602 }
603
604 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
605 {
606         struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
607
608         if (sbi->uid != -1)
609                 seq_printf(seq, ",uid=%d", sbi->uid);
610         if (sbi->gid != -1)
611                 seq_printf(seq, ",gid=%d", sbi->gid);
612         if (sbi->umask != -1)
613                 seq_printf(seq, ",umask=%03o", sbi->umask);
614         if (sbi->flag & JFS_NOINTEGRITY)
615                 seq_puts(seq, ",nointegrity");
616         if (sbi->nls_tab)
617                 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
618         if (sbi->flag & JFS_ERR_CONTINUE)
619                 seq_printf(seq, ",errors=continue");
620         if (sbi->flag & JFS_ERR_PANIC)
621                 seq_printf(seq, ",errors=panic");
622
623 #ifdef CONFIG_QUOTA
624         if (sbi->flag & JFS_USRQUOTA)
625                 seq_puts(seq, ",usrquota");
626
627         if (sbi->flag & JFS_GRPQUOTA)
628                 seq_puts(seq, ",grpquota");
629 #endif
630
631         return 0;
632 }
633
634 #ifdef CONFIG_QUOTA
635
636 /* Read data from quotafile - avoid pagecache and such because we cannot afford
637  * acquiring the locks... As quota files are never truncated and quota code
638  * itself serializes the operations (and noone else should touch the files)
639  * we don't have to be afraid of races */
640 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
641                               size_t len, loff_t off)
642 {
643         struct inode *inode = sb_dqopt(sb)->files[type];
644         sector_t blk = off >> sb->s_blocksize_bits;
645         int err = 0;
646         int offset = off & (sb->s_blocksize - 1);
647         int tocopy;
648         size_t toread;
649         struct buffer_head tmp_bh;
650         struct buffer_head *bh;
651         loff_t i_size = i_size_read(inode);
652
653         if (off > i_size)
654                 return 0;
655         if (off+len > i_size)
656                 len = i_size-off;
657         toread = len;
658         while (toread > 0) {
659                 tocopy = sb->s_blocksize - offset < toread ?
660                                 sb->s_blocksize - offset : toread;
661
662                 tmp_bh.b_state = 0;
663                 tmp_bh.b_size = 1 << inode->i_blkbits;
664                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
665                 if (err)
666                         return err;
667                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
668                         memset(data, 0, tocopy);
669                 else {
670                         bh = sb_bread(sb, tmp_bh.b_blocknr);
671                         if (!bh)
672                                 return -EIO;
673                         memcpy(data, bh->b_data+offset, tocopy);
674                         brelse(bh);
675                 }
676                 offset = 0;
677                 toread -= tocopy;
678                 data += tocopy;
679                 blk++;
680         }
681         return len;
682 }
683
684 /* Write to quotafile */
685 static ssize_t jfs_quota_write(struct super_block *sb, int type,
686                                const char *data, size_t len, loff_t off)
687 {
688         struct inode *inode = sb_dqopt(sb)->files[type];
689         sector_t blk = off >> sb->s_blocksize_bits;
690         int err = 0;
691         int offset = off & (sb->s_blocksize - 1);
692         int tocopy;
693         size_t towrite = len;
694         struct buffer_head tmp_bh;
695         struct buffer_head *bh;
696
697         mutex_lock(&inode->i_mutex);
698         while (towrite > 0) {
699                 tocopy = sb->s_blocksize - offset < towrite ?
700                                 sb->s_blocksize - offset : towrite;
701
702                 tmp_bh.b_state = 0;
703                 tmp_bh.b_size = 1 << inode->i_blkbits;
704                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
705                 if (err)
706                         goto out;
707                 if (offset || tocopy != sb->s_blocksize)
708                         bh = sb_bread(sb, tmp_bh.b_blocknr);
709                 else
710                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
711                 if (!bh) {
712                         err = -EIO;
713                         goto out;
714                 }
715                 lock_buffer(bh);
716                 memcpy(bh->b_data+offset, data, tocopy);
717                 flush_dcache_page(bh->b_page);
718                 set_buffer_uptodate(bh);
719                 mark_buffer_dirty(bh);
720                 unlock_buffer(bh);
721                 brelse(bh);
722                 offset = 0;
723                 towrite -= tocopy;
724                 data += tocopy;
725                 blk++;
726         }
727 out:
728         if (len == towrite) {
729                 mutex_unlock(&inode->i_mutex);
730                 return err;
731         }
732         if (inode->i_size < off+len-towrite)
733                 i_size_write(inode, off+len-towrite);
734         inode->i_version++;
735         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
736         mark_inode_dirty(inode);
737         mutex_unlock(&inode->i_mutex);
738         return len - towrite;
739 }
740
741 #endif
742
743 static const struct super_operations jfs_super_operations = {
744         .alloc_inode    = jfs_alloc_inode,
745         .destroy_inode  = jfs_destroy_inode,
746         .dirty_inode    = jfs_dirty_inode,
747         .write_inode    = jfs_write_inode,
748         .delete_inode   = jfs_delete_inode,
749         .put_super      = jfs_put_super,
750         .sync_fs        = jfs_sync_fs,
751         .freeze_fs      = jfs_freeze,
752         .unfreeze_fs    = jfs_unfreeze,
753         .statfs         = jfs_statfs,
754         .remount_fs     = jfs_remount,
755         .show_options   = jfs_show_options,
756 #ifdef CONFIG_QUOTA
757         .quota_read     = jfs_quota_read,
758         .quota_write    = jfs_quota_write,
759 #endif
760 };
761
762 static const struct export_operations jfs_export_operations = {
763         .fh_to_dentry   = jfs_fh_to_dentry,
764         .fh_to_parent   = jfs_fh_to_parent,
765         .get_parent     = jfs_get_parent,
766 };
767
768 static struct file_system_type jfs_fs_type = {
769         .owner          = THIS_MODULE,
770         .name           = "jfs",
771         .get_sb         = jfs_get_sb,
772         .kill_sb        = kill_block_super,
773         .fs_flags       = FS_REQUIRES_DEV,
774 };
775
776 static void init_once(void *foo)
777 {
778         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
779
780         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
781         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
782         init_rwsem(&jfs_ip->rdwrlock);
783         mutex_init(&jfs_ip->commit_mutex);
784         init_rwsem(&jfs_ip->xattr_sem);
785         spin_lock_init(&jfs_ip->ag_lock);
786         jfs_ip->active_ag = -1;
787 #ifdef CONFIG_JFS_POSIX_ACL
788         jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
789         jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
790 #endif
791         inode_init_once(&jfs_ip->vfs_inode);
792 }
793
794 static int __init init_jfs_fs(void)
795 {
796         int i;
797         int rc;
798
799         jfs_inode_cachep =
800             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
801                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
802                             init_once);
803         if (jfs_inode_cachep == NULL)
804                 return -ENOMEM;
805
806         /*
807          * Metapage initialization
808          */
809         rc = metapage_init();
810         if (rc) {
811                 jfs_err("metapage_init failed w/rc = %d", rc);
812                 goto free_slab;
813         }
814
815         /*
816          * Transaction Manager initialization
817          */
818         rc = txInit();
819         if (rc) {
820                 jfs_err("txInit failed w/rc = %d", rc);
821                 goto free_metapage;
822         }
823
824         /*
825          * I/O completion thread (endio)
826          */
827         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
828         if (IS_ERR(jfsIOthread)) {
829                 rc = PTR_ERR(jfsIOthread);
830                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
831                 goto end_txmngr;
832         }
833
834         if (commit_threads < 1)
835                 commit_threads = num_online_cpus();
836         if (commit_threads > MAX_COMMIT_THREADS)
837                 commit_threads = MAX_COMMIT_THREADS;
838
839         for (i = 0; i < commit_threads; i++) {
840                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
841                 if (IS_ERR(jfsCommitThread[i])) {
842                         rc = PTR_ERR(jfsCommitThread[i]);
843                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
844                         commit_threads = i;
845                         goto kill_committask;
846                 }
847         }
848
849         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
850         if (IS_ERR(jfsSyncThread)) {
851                 rc = PTR_ERR(jfsSyncThread);
852                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
853                 goto kill_committask;
854         }
855
856 #ifdef PROC_FS_JFS
857         jfs_proc_init();
858 #endif
859
860         return register_filesystem(&jfs_fs_type);
861
862 kill_committask:
863         for (i = 0; i < commit_threads; i++)
864                 kthread_stop(jfsCommitThread[i]);
865         kthread_stop(jfsIOthread);
866 end_txmngr:
867         txExit();
868 free_metapage:
869         metapage_exit();
870 free_slab:
871         kmem_cache_destroy(jfs_inode_cachep);
872         return rc;
873 }
874
875 static void __exit exit_jfs_fs(void)
876 {
877         int i;
878
879         jfs_info("exit_jfs_fs called");
880
881         txExit();
882         metapage_exit();
883
884         kthread_stop(jfsIOthread);
885         for (i = 0; i < commit_threads; i++)
886                 kthread_stop(jfsCommitThread[i]);
887         kthread_stop(jfsSyncThread);
888 #ifdef PROC_FS_JFS
889         jfs_proc_clean();
890 #endif
891         unregister_filesystem(&jfs_fs_type);
892         kmem_cache_destroy(jfs_inode_cachep);
893 }
894
895 module_init(init_jfs_fs)
896 module_exit(exit_jfs_fs)