Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

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

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