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TOMOYO Linux Cross Reference
Linux/fs/jfs/super.c

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  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         if (!parse_options(data, sb, &newLVSize, &flag)) {
422                 return -EINVAL;
423         }
424 
425         if (newLVSize) {
426                 if (sb->s_flags & MS_RDONLY) {
427                         pr_err("JFS: resize requires volume" \
428                                 " to be mounted read-write\n");
429                         return -EROFS;
430                 }
431                 rc = jfs_extendfs(sb, newLVSize, 0);
432                 if (rc)
433                         return rc;
434         }
435 
436         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
437                 /*
438                  * Invalidate any previously read metadata.  fsck may have
439                  * changed the on-disk data since we mounted r/o
440                  */
441                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
442 
443                 JFS_SBI(sb)->flag = flag;
444                 ret = jfs_mount_rw(sb, 1);
445 
446                 /* mark the fs r/w for quota activity */
447                 sb->s_flags &= ~MS_RDONLY;
448 
449                 dquot_resume(sb, -1);
450                 return ret;
451         }
452         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
453                 rc = dquot_suspend(sb, -1);
454                 if (rc < 0) {
455                         return rc;
456                 }
457                 rc = jfs_umount_rw(sb);
458                 JFS_SBI(sb)->flag = flag;
459                 return rc;
460         }
461         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
462                 if (!(sb->s_flags & MS_RDONLY)) {
463                         rc = jfs_umount_rw(sb);
464                         if (rc)
465                                 return rc;
466 
467                         JFS_SBI(sb)->flag = flag;
468                         ret = jfs_mount_rw(sb, 1);
469                         return ret;
470                 }
471         JFS_SBI(sb)->flag = flag;
472 
473         return 0;
474 }
475 
476 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
477 {
478         struct jfs_sb_info *sbi;
479         struct inode *inode;
480         int rc;
481         s64 newLVSize = 0;
482         int flag, ret = -EINVAL;
483 
484         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
485 
486         if (!new_valid_dev(sb->s_bdev->bd_dev))
487                 return -EOVERFLOW;
488 
489         sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
490         if (!sbi)
491                 return -ENOMEM;
492 
493         sb->s_fs_info = sbi;
494         sb->s_max_links = JFS_LINK_MAX;
495         sbi->sb = sb;
496         sbi->uid = INVALID_UID;
497         sbi->gid = INVALID_GID;
498         sbi->umask = -1;
499 
500         /* initialize the mount flag and determine the default error handler */
501         flag = JFS_ERR_REMOUNT_RO;
502 
503         if (!parse_options((char *) data, sb, &newLVSize, &flag))
504                 goto out_kfree;
505         sbi->flag = flag;
506 
507 #ifdef CONFIG_JFS_POSIX_ACL
508         sb->s_flags |= MS_POSIXACL;
509 #endif
510 
511         if (newLVSize) {
512                 pr_err("resize option for remount only\n");
513                 goto out_kfree;
514         }
515 
516         /*
517          * Initialize blocksize to 4K.
518          */
519         sb_set_blocksize(sb, PSIZE);
520 
521         /*
522          * Set method vectors.
523          */
524         sb->s_op = &jfs_super_operations;
525         sb->s_export_op = &jfs_export_operations;
526         sb->s_xattr = jfs_xattr_handlers;
527 #ifdef CONFIG_QUOTA
528         sb->dq_op = &dquot_operations;
529         sb->s_qcop = &dquot_quotactl_ops;
530 #endif
531 
532         /*
533          * Initialize direct-mapping inode/address-space
534          */
535         inode = new_inode(sb);
536         if (inode == NULL) {
537                 ret = -ENOMEM;
538                 goto out_unload;
539         }
540         inode->i_ino = 0;
541         inode->i_size = sb->s_bdev->bd_inode->i_size;
542         inode->i_mapping->a_ops = &jfs_metapage_aops;
543         insert_inode_hash(inode);
544         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
545 
546         sbi->direct_inode = inode;
547 
548         rc = jfs_mount(sb);
549         if (rc) {
550                 if (!silent) {
551                         jfs_err("jfs_mount failed w/return code = %d", rc);
552                 }
553                 goto out_mount_failed;
554         }
555         if (sb->s_flags & MS_RDONLY)
556                 sbi->log = NULL;
557         else {
558                 rc = jfs_mount_rw(sb, 0);
559                 if (rc) {
560                         if (!silent) {
561                                 jfs_err("jfs_mount_rw failed, return code = %d",
562                                         rc);
563                         }
564                         goto out_no_rw;
565                 }
566         }
567 
568         sb->s_magic = JFS_SUPER_MAGIC;
569 
570         if (sbi->mntflag & JFS_OS2)
571                 sb->s_d_op = &jfs_ci_dentry_operations;
572 
573         inode = jfs_iget(sb, ROOT_I);
574         if (IS_ERR(inode)) {
575                 ret = PTR_ERR(inode);
576                 goto out_no_rw;
577         }
578         sb->s_root = d_make_root(inode);
579         if (!sb->s_root)
580                 goto out_no_root;
581 
582         /* logical blocks are represented by 40 bits in pxd_t, etc. */
583         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
584 #if BITS_PER_LONG == 32
585         /*
586          * Page cache is indexed by long.
587          * I would use MAX_LFS_FILESIZE, but it's only half as big
588          */
589         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
590 #endif
591         sb->s_time_gran = 1;
592         return 0;
593 
594 out_no_root:
595         jfs_err("jfs_read_super: get root dentry failed");
596 
597 out_no_rw:
598         rc = jfs_umount(sb);
599         if (rc) {
600                 jfs_err("jfs_umount failed with return code %d", rc);
601         }
602 out_mount_failed:
603         filemap_write_and_wait(sbi->direct_inode->i_mapping);
604         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
605         make_bad_inode(sbi->direct_inode);
606         iput(sbi->direct_inode);
607         sbi->direct_inode = NULL;
608 out_unload:
609         if (sbi->nls_tab)
610                 unload_nls(sbi->nls_tab);
611 out_kfree:
612         kfree(sbi);
613         return ret;
614 }
615 
616 static int jfs_freeze(struct super_block *sb)
617 {
618         struct jfs_sb_info *sbi = JFS_SBI(sb);
619         struct jfs_log *log = sbi->log;
620         int rc = 0;
621 
622         if (!(sb->s_flags & MS_RDONLY)) {
623                 txQuiesce(sb);
624                 rc = lmLogShutdown(log);
625                 if (rc) {
626                         jfs_error(sb, "lmLogShutdown failed\n");
627 
628                         /* let operations fail rather than hang */
629                         txResume(sb);
630 
631                         return rc;
632                 }
633                 rc = updateSuper(sb, FM_CLEAN);
634                 if (rc) {
635                         jfs_err("jfs_freeze: updateSuper failed\n");
636                         /*
637                          * Don't fail here. Everything succeeded except
638                          * marking the superblock clean, so there's really
639                          * no harm in leaving it frozen for now.
640                          */
641                 }
642         }
643         return 0;
644 }
645 
646 static int jfs_unfreeze(struct super_block *sb)
647 {
648         struct jfs_sb_info *sbi = JFS_SBI(sb);
649         struct jfs_log *log = sbi->log;
650         int rc = 0;
651 
652         if (!(sb->s_flags & MS_RDONLY)) {
653                 rc = updateSuper(sb, FM_MOUNT);
654                 if (rc) {
655                         jfs_error(sb, "updateSuper failed\n");
656                         goto out;
657                 }
658                 rc = lmLogInit(log);
659                 if (rc)
660                         jfs_error(sb, "lmLogInit failed\n");
661 out:
662                 txResume(sb);
663         }
664         return rc;
665 }
666 
667 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
668         int flags, const char *dev_name, void *data)
669 {
670         return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
671 }
672 
673 static int jfs_sync_fs(struct super_block *sb, int wait)
674 {
675         struct jfs_log *log = JFS_SBI(sb)->log;
676 
677         /* log == NULL indicates read-only mount */
678         if (log) {
679                 /*
680                  * Write quota structures to quota file, sync_blockdev() will
681                  * write them to disk later
682                  */
683                 dquot_writeback_dquots(sb, -1);
684                 jfs_flush_journal(log, wait);
685                 jfs_syncpt(log, 0);
686         }
687 
688         return 0;
689 }
690 
691 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
692 {
693         struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
694 
695         if (uid_valid(sbi->uid))
696                 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
697         if (gid_valid(sbi->gid))
698                 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
699         if (sbi->umask != -1)
700                 seq_printf(seq, ",umask=%03o", sbi->umask);
701         if (sbi->flag & JFS_NOINTEGRITY)
702                 seq_puts(seq, ",nointegrity");
703         if (sbi->flag & JFS_DISCARD)
704                 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
705         if (sbi->nls_tab)
706                 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
707         if (sbi->flag & JFS_ERR_CONTINUE)
708                 seq_printf(seq, ",errors=continue");
709         if (sbi->flag & JFS_ERR_PANIC)
710                 seq_printf(seq, ",errors=panic");
711 
712 #ifdef CONFIG_QUOTA
713         if (sbi->flag & JFS_USRQUOTA)
714                 seq_puts(seq, ",usrquota");
715 
716         if (sbi->flag & JFS_GRPQUOTA)
717                 seq_puts(seq, ",grpquota");
718 #endif
719 
720         return 0;
721 }
722 
723 #ifdef CONFIG_QUOTA
724 
725 /* Read data from quotafile - avoid pagecache and such because we cannot afford
726  * acquiring the locks... As quota files are never truncated and quota code
727  * itself serializes the operations (and no one else should touch the files)
728  * we don't have to be afraid of races */
729 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
730                               size_t len, loff_t off)
731 {
732         struct inode *inode = sb_dqopt(sb)->files[type];
733         sector_t blk = off >> sb->s_blocksize_bits;
734         int err = 0;
735         int offset = off & (sb->s_blocksize - 1);
736         int tocopy;
737         size_t toread;
738         struct buffer_head tmp_bh;
739         struct buffer_head *bh;
740         loff_t i_size = i_size_read(inode);
741 
742         if (off > i_size)
743                 return 0;
744         if (off+len > i_size)
745                 len = i_size-off;
746         toread = len;
747         while (toread > 0) {
748                 tocopy = sb->s_blocksize - offset < toread ?
749                                 sb->s_blocksize - offset : toread;
750 
751                 tmp_bh.b_state = 0;
752                 tmp_bh.b_size = 1 << inode->i_blkbits;
753                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
754                 if (err)
755                         return err;
756                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
757                         memset(data, 0, tocopy);
758                 else {
759                         bh = sb_bread(sb, tmp_bh.b_blocknr);
760                         if (!bh)
761                                 return -EIO;
762                         memcpy(data, bh->b_data+offset, tocopy);
763                         brelse(bh);
764                 }
765                 offset = 0;
766                 toread -= tocopy;
767                 data += tocopy;
768                 blk++;
769         }
770         return len;
771 }
772 
773 /* Write to quotafile */
774 static ssize_t jfs_quota_write(struct super_block *sb, int type,
775                                const char *data, size_t len, loff_t off)
776 {
777         struct inode *inode = sb_dqopt(sb)->files[type];
778         sector_t blk = off >> sb->s_blocksize_bits;
779         int err = 0;
780         int offset = off & (sb->s_blocksize - 1);
781         int tocopy;
782         size_t towrite = len;
783         struct buffer_head tmp_bh;
784         struct buffer_head *bh;
785 
786         mutex_lock(&inode->i_mutex);
787         while (towrite > 0) {
788                 tocopy = sb->s_blocksize - offset < towrite ?
789                                 sb->s_blocksize - offset : towrite;
790 
791                 tmp_bh.b_state = 0;
792                 tmp_bh.b_size = 1 << inode->i_blkbits;
793                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
794                 if (err)
795                         goto out;
796                 if (offset || tocopy != sb->s_blocksize)
797                         bh = sb_bread(sb, tmp_bh.b_blocknr);
798                 else
799                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
800                 if (!bh) {
801                         err = -EIO;
802                         goto out;
803                 }
804                 lock_buffer(bh);
805                 memcpy(bh->b_data+offset, data, tocopy);
806                 flush_dcache_page(bh->b_page);
807                 set_buffer_uptodate(bh);
808                 mark_buffer_dirty(bh);
809                 unlock_buffer(bh);
810                 brelse(bh);
811                 offset = 0;
812                 towrite -= tocopy;
813                 data += tocopy;
814                 blk++;
815         }
816 out:
817         if (len == towrite) {
818                 mutex_unlock(&inode->i_mutex);
819                 return err;
820         }
821         if (inode->i_size < off+len-towrite)
822                 i_size_write(inode, off+len-towrite);
823         inode->i_version++;
824         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
825         mark_inode_dirty(inode);
826         mutex_unlock(&inode->i_mutex);
827         return len - towrite;
828 }
829 
830 #endif
831 
832 static const struct super_operations jfs_super_operations = {
833         .alloc_inode    = jfs_alloc_inode,
834         .destroy_inode  = jfs_destroy_inode,
835         .dirty_inode    = jfs_dirty_inode,
836         .write_inode    = jfs_write_inode,
837         .evict_inode    = jfs_evict_inode,
838         .put_super      = jfs_put_super,
839         .sync_fs        = jfs_sync_fs,
840         .freeze_fs      = jfs_freeze,
841         .unfreeze_fs    = jfs_unfreeze,
842         .statfs         = jfs_statfs,
843         .remount_fs     = jfs_remount,
844         .show_options   = jfs_show_options,
845 #ifdef CONFIG_QUOTA
846         .quota_read     = jfs_quota_read,
847         .quota_write    = jfs_quota_write,
848 #endif
849 };
850 
851 static const struct export_operations jfs_export_operations = {
852         .fh_to_dentry   = jfs_fh_to_dentry,
853         .fh_to_parent   = jfs_fh_to_parent,
854         .get_parent     = jfs_get_parent,
855 };
856 
857 static struct file_system_type jfs_fs_type = {
858         .owner          = THIS_MODULE,
859         .name           = "jfs",
860         .mount          = jfs_do_mount,
861         .kill_sb        = kill_block_super,
862         .fs_flags       = FS_REQUIRES_DEV,
863 };
864 MODULE_ALIAS_FS("jfs");
865 
866 static void init_once(void *foo)
867 {
868         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
869 
870         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
871         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
872         init_rwsem(&jfs_ip->rdwrlock);
873         mutex_init(&jfs_ip->commit_mutex);
874         init_rwsem(&jfs_ip->xattr_sem);
875         spin_lock_init(&jfs_ip->ag_lock);
876         jfs_ip->active_ag = -1;
877         inode_init_once(&jfs_ip->vfs_inode);
878 }
879 
880 static int __init init_jfs_fs(void)
881 {
882         int i;
883         int rc;
884 
885         jfs_inode_cachep =
886             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
887                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
888                             init_once);
889         if (jfs_inode_cachep == NULL)
890                 return -ENOMEM;
891 
892         /*
893          * Metapage initialization
894          */
895         rc = metapage_init();
896         if (rc) {
897                 jfs_err("metapage_init failed w/rc = %d", rc);
898                 goto free_slab;
899         }
900 
901         /*
902          * Transaction Manager initialization
903          */
904         rc = txInit();
905         if (rc) {
906                 jfs_err("txInit failed w/rc = %d", rc);
907                 goto free_metapage;
908         }
909 
910         /*
911          * I/O completion thread (endio)
912          */
913         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
914         if (IS_ERR(jfsIOthread)) {
915                 rc = PTR_ERR(jfsIOthread);
916                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
917                 goto end_txmngr;
918         }
919 
920         if (commit_threads < 1)
921                 commit_threads = num_online_cpus();
922         if (commit_threads > MAX_COMMIT_THREADS)
923                 commit_threads = MAX_COMMIT_THREADS;
924 
925         for (i = 0; i < commit_threads; i++) {
926                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
927                 if (IS_ERR(jfsCommitThread[i])) {
928                         rc = PTR_ERR(jfsCommitThread[i]);
929                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
930                         commit_threads = i;
931                         goto kill_committask;
932                 }
933         }
934 
935         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
936         if (IS_ERR(jfsSyncThread)) {
937                 rc = PTR_ERR(jfsSyncThread);
938                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
939                 goto kill_committask;
940         }
941 
942 #ifdef PROC_FS_JFS
943         jfs_proc_init();
944 #endif
945 
946         rc = register_filesystem(&jfs_fs_type);
947         if (!rc)
948                 return 0;
949 
950 #ifdef PROC_FS_JFS
951         jfs_proc_clean();
952 #endif
953         kthread_stop(jfsSyncThread);
954 kill_committask:
955         for (i = 0; i < commit_threads; i++)
956                 kthread_stop(jfsCommitThread[i]);
957         kthread_stop(jfsIOthread);
958 end_txmngr:
959         txExit();
960 free_metapage:
961         metapage_exit();
962 free_slab:
963         kmem_cache_destroy(jfs_inode_cachep);
964         return rc;
965 }
966 
967 static void __exit exit_jfs_fs(void)
968 {
969         int i;
970 
971         jfs_info("exit_jfs_fs called");
972 
973         txExit();
974         metapage_exit();
975 
976         kthread_stop(jfsIOthread);
977         for (i = 0; i < commit_threads; i++)
978                 kthread_stop(jfsCommitThread[i]);
979         kthread_stop(jfsSyncThread);
980 #ifdef PROC_FS_JFS
981         jfs_proc_clean();
982 #endif
983         unregister_filesystem(&jfs_fs_type);
984 
985         /*
986          * Make sure all delayed rcu free inodes are flushed before we
987          * destroy cache.
988          */
989         rcu_barrier();
990         kmem_cache_destroy(jfs_inode_cachep);
991 }
992 
993 module_init(init_jfs_fs)
994 module_exit(exit_jfs_fs)
995 

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