Version:  2.0.40 2.2.26 2.4.37 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 3.16 3.17 3.18 3.19

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

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