Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5

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): %ps: %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         sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL);
500         if (!sbi)
501                 return -ENOMEM;
502 
503         sb->s_fs_info = sbi;
504         sb->s_max_links = JFS_LINK_MAX;
505         sbi->sb = sb;
506         sbi->uid = INVALID_UID;
507         sbi->gid = INVALID_GID;
508         sbi->umask = -1;
509 
510         /* initialize the mount flag and determine the default error handler */
511         flag = JFS_ERR_REMOUNT_RO;
512 
513         if (!parse_options((char *) data, sb, &newLVSize, &flag))
514                 goto out_kfree;
515         sbi->flag = flag;
516 
517 #ifdef CONFIG_JFS_POSIX_ACL
518         sb->s_flags |= MS_POSIXACL;
519 #endif
520 
521         if (newLVSize) {
522                 pr_err("resize option for remount only\n");
523                 goto out_kfree;
524         }
525 
526         /*
527          * Initialize blocksize to 4K.
528          */
529         sb_set_blocksize(sb, PSIZE);
530 
531         /*
532          * Set method vectors.
533          */
534         sb->s_op = &jfs_super_operations;
535         sb->s_export_op = &jfs_export_operations;
536         sb->s_xattr = jfs_xattr_handlers;
537 #ifdef CONFIG_QUOTA
538         sb->dq_op = &dquot_operations;
539         sb->s_qcop = &dquot_quotactl_ops;
540         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
541 #endif
542 
543         /*
544          * Initialize direct-mapping inode/address-space
545          */
546         inode = new_inode(sb);
547         if (inode == NULL) {
548                 ret = -ENOMEM;
549                 goto out_unload;
550         }
551         inode->i_ino = 0;
552         inode->i_size = sb->s_bdev->bd_inode->i_size;
553         inode->i_mapping->a_ops = &jfs_metapage_aops;
554         hlist_add_fake(&inode->i_hash);
555         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
556 
557         sbi->direct_inode = inode;
558 
559         rc = jfs_mount(sb);
560         if (rc) {
561                 if (!silent)
562                         jfs_err("jfs_mount failed w/return code = %d", rc);
563                 goto out_mount_failed;
564         }
565         if (sb->s_flags & MS_RDONLY)
566                 sbi->log = NULL;
567         else {
568                 rc = jfs_mount_rw(sb, 0);
569                 if (rc) {
570                         if (!silent) {
571                                 jfs_err("jfs_mount_rw failed, return code = %d",
572                                         rc);
573                         }
574                         goto out_no_rw;
575                 }
576         }
577 
578         sb->s_magic = JFS_SUPER_MAGIC;
579 
580         if (sbi->mntflag & JFS_OS2)
581                 sb->s_d_op = &jfs_ci_dentry_operations;
582 
583         inode = jfs_iget(sb, ROOT_I);
584         if (IS_ERR(inode)) {
585                 ret = PTR_ERR(inode);
586                 goto out_no_rw;
587         }
588         sb->s_root = d_make_root(inode);
589         if (!sb->s_root)
590                 goto out_no_root;
591 
592         /* logical blocks are represented by 40 bits in pxd_t, etc. */
593         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
594 #if BITS_PER_LONG == 32
595         /*
596          * Page cache is indexed by long.
597          * I would use MAX_LFS_FILESIZE, but it's only half as big
598          */
599         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1,
600                              (u64)sb->s_maxbytes);
601 #endif
602         sb->s_time_gran = 1;
603         return 0;
604 
605 out_no_root:
606         jfs_err("jfs_read_super: get root dentry failed");
607 
608 out_no_rw:
609         rc = jfs_umount(sb);
610         if (rc)
611                 jfs_err("jfs_umount failed with return code %d", rc);
612 out_mount_failed:
613         filemap_write_and_wait(sbi->direct_inode->i_mapping);
614         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
615         make_bad_inode(sbi->direct_inode);
616         iput(sbi->direct_inode);
617         sbi->direct_inode = NULL;
618 out_unload:
619         unload_nls(sbi->nls_tab);
620 out_kfree:
621         kfree(sbi);
622         return ret;
623 }
624 
625 static int jfs_freeze(struct super_block *sb)
626 {
627         struct jfs_sb_info *sbi = JFS_SBI(sb);
628         struct jfs_log *log = sbi->log;
629         int rc = 0;
630 
631         if (!(sb->s_flags & MS_RDONLY)) {
632                 txQuiesce(sb);
633                 rc = lmLogShutdown(log);
634                 if (rc) {
635                         jfs_error(sb, "lmLogShutdown failed\n");
636 
637                         /* let operations fail rather than hang */
638                         txResume(sb);
639 
640                         return rc;
641                 }
642                 rc = updateSuper(sb, FM_CLEAN);
643                 if (rc) {
644                         jfs_err("jfs_freeze: updateSuper failed\n");
645                         /*
646                          * Don't fail here. Everything succeeded except
647                          * marking the superblock clean, so there's really
648                          * no harm in leaving it frozen for now.
649                          */
650                 }
651         }
652         return 0;
653 }
654 
655 static int jfs_unfreeze(struct super_block *sb)
656 {
657         struct jfs_sb_info *sbi = JFS_SBI(sb);
658         struct jfs_log *log = sbi->log;
659         int rc = 0;
660 
661         if (!(sb->s_flags & MS_RDONLY)) {
662                 rc = updateSuper(sb, FM_MOUNT);
663                 if (rc) {
664                         jfs_error(sb, "updateSuper failed\n");
665                         goto out;
666                 }
667                 rc = lmLogInit(log);
668                 if (rc)
669                         jfs_error(sb, "lmLogInit failed\n");
670 out:
671                 txResume(sb);
672         }
673         return rc;
674 }
675 
676 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
677         int flags, const char *dev_name, void *data)
678 {
679         return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
680 }
681 
682 static int jfs_sync_fs(struct super_block *sb, int wait)
683 {
684         struct jfs_log *log = JFS_SBI(sb)->log;
685 
686         /* log == NULL indicates read-only mount */
687         if (log) {
688                 /*
689                  * Write quota structures to quota file, sync_blockdev() will
690                  * write them to disk later
691                  */
692                 dquot_writeback_dquots(sb, -1);
693                 jfs_flush_journal(log, wait);
694                 jfs_syncpt(log, 0);
695         }
696 
697         return 0;
698 }
699 
700 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
701 {
702         struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
703 
704         if (uid_valid(sbi->uid))
705                 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
706         if (gid_valid(sbi->gid))
707                 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
708         if (sbi->umask != -1)
709                 seq_printf(seq, ",umask=%03o", sbi->umask);
710         if (sbi->flag & JFS_NOINTEGRITY)
711                 seq_puts(seq, ",nointegrity");
712         if (sbi->flag & JFS_DISCARD)
713                 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
714         if (sbi->nls_tab)
715                 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
716         if (sbi->flag & JFS_ERR_CONTINUE)
717                 seq_printf(seq, ",errors=continue");
718         if (sbi->flag & JFS_ERR_PANIC)
719                 seq_printf(seq, ",errors=panic");
720 
721 #ifdef CONFIG_QUOTA
722         if (sbi->flag & JFS_USRQUOTA)
723                 seq_puts(seq, ",usrquota");
724 
725         if (sbi->flag & JFS_GRPQUOTA)
726                 seq_puts(seq, ",grpquota");
727 #endif
728 
729         return 0;
730 }
731 
732 #ifdef CONFIG_QUOTA
733 
734 /* Read data from quotafile - avoid pagecache and such because we cannot afford
735  * acquiring the locks... As quota files are never truncated and quota code
736  * itself serializes the operations (and no one else should touch the files)
737  * we don't have to be afraid of races */
738 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
739                               size_t len, loff_t off)
740 {
741         struct inode *inode = sb_dqopt(sb)->files[type];
742         sector_t blk = off >> sb->s_blocksize_bits;
743         int err = 0;
744         int offset = off & (sb->s_blocksize - 1);
745         int tocopy;
746         size_t toread;
747         struct buffer_head tmp_bh;
748         struct buffer_head *bh;
749         loff_t i_size = i_size_read(inode);
750 
751         if (off > i_size)
752                 return 0;
753         if (off+len > i_size)
754                 len = i_size-off;
755         toread = len;
756         while (toread > 0) {
757                 tocopy = sb->s_blocksize - offset < toread ?
758                                 sb->s_blocksize - offset : toread;
759 
760                 tmp_bh.b_state = 0;
761                 tmp_bh.b_size = 1 << inode->i_blkbits;
762                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
763                 if (err)
764                         return err;
765                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
766                         memset(data, 0, tocopy);
767                 else {
768                         bh = sb_bread(sb, tmp_bh.b_blocknr);
769                         if (!bh)
770                                 return -EIO;
771                         memcpy(data, bh->b_data+offset, tocopy);
772                         brelse(bh);
773                 }
774                 offset = 0;
775                 toread -= tocopy;
776                 data += tocopy;
777                 blk++;
778         }
779         return len;
780 }
781 
782 /* Write to quotafile */
783 static ssize_t jfs_quota_write(struct super_block *sb, int type,
784                                const char *data, size_t len, loff_t off)
785 {
786         struct inode *inode = sb_dqopt(sb)->files[type];
787         sector_t blk = off >> sb->s_blocksize_bits;
788         int err = 0;
789         int offset = off & (sb->s_blocksize - 1);
790         int tocopy;
791         size_t towrite = len;
792         struct buffer_head tmp_bh;
793         struct buffer_head *bh;
794 
795         inode_lock(inode);
796         while (towrite > 0) {
797                 tocopy = sb->s_blocksize - offset < towrite ?
798                                 sb->s_blocksize - offset : towrite;
799 
800                 tmp_bh.b_state = 0;
801                 tmp_bh.b_size = 1 << inode->i_blkbits;
802                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
803                 if (err)
804                         goto out;
805                 if (offset || tocopy != sb->s_blocksize)
806                         bh = sb_bread(sb, tmp_bh.b_blocknr);
807                 else
808                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
809                 if (!bh) {
810                         err = -EIO;
811                         goto out;
812                 }
813                 lock_buffer(bh);
814                 memcpy(bh->b_data+offset, data, tocopy);
815                 flush_dcache_page(bh->b_page);
816                 set_buffer_uptodate(bh);
817                 mark_buffer_dirty(bh);
818                 unlock_buffer(bh);
819                 brelse(bh);
820                 offset = 0;
821                 towrite -= tocopy;
822                 data += tocopy;
823                 blk++;
824         }
825 out:
826         if (len == towrite) {
827                 inode_unlock(inode);
828                 return err;
829         }
830         if (inode->i_size < off+len-towrite)
831                 i_size_write(inode, off+len-towrite);
832         inode->i_version++;
833         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
834         mark_inode_dirty(inode);
835         inode_unlock(inode);
836         return len - towrite;
837 }
838 
839 static struct dquot **jfs_get_dquots(struct inode *inode)
840 {
841         return JFS_IP(inode)->i_dquot;
842 }
843 #endif
844 
845 static const struct super_operations jfs_super_operations = {
846         .alloc_inode    = jfs_alloc_inode,
847         .destroy_inode  = jfs_destroy_inode,
848         .dirty_inode    = jfs_dirty_inode,
849         .write_inode    = jfs_write_inode,
850         .evict_inode    = jfs_evict_inode,
851         .put_super      = jfs_put_super,
852         .sync_fs        = jfs_sync_fs,
853         .freeze_fs      = jfs_freeze,
854         .unfreeze_fs    = jfs_unfreeze,
855         .statfs         = jfs_statfs,
856         .remount_fs     = jfs_remount,
857         .show_options   = jfs_show_options,
858 #ifdef CONFIG_QUOTA
859         .quota_read     = jfs_quota_read,
860         .quota_write    = jfs_quota_write,
861         .get_dquots     = jfs_get_dquots,
862 #endif
863 };
864 
865 static const struct export_operations jfs_export_operations = {
866         .fh_to_dentry   = jfs_fh_to_dentry,
867         .fh_to_parent   = jfs_fh_to_parent,
868         .get_parent     = jfs_get_parent,
869 };
870 
871 static struct file_system_type jfs_fs_type = {
872         .owner          = THIS_MODULE,
873         .name           = "jfs",
874         .mount          = jfs_do_mount,
875         .kill_sb        = kill_block_super,
876         .fs_flags       = FS_REQUIRES_DEV,
877 };
878 MODULE_ALIAS_FS("jfs");
879 
880 static void init_once(void *foo)
881 {
882         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
883 
884         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
885         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
886         init_rwsem(&jfs_ip->rdwrlock);
887         mutex_init(&jfs_ip->commit_mutex);
888         init_rwsem(&jfs_ip->xattr_sem);
889         spin_lock_init(&jfs_ip->ag_lock);
890         jfs_ip->active_ag = -1;
891         inode_init_once(&jfs_ip->vfs_inode);
892 }
893 
894 static int __init init_jfs_fs(void)
895 {
896         int i;
897         int rc;
898 
899         jfs_inode_cachep =
900             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
901                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
902                             init_once);
903         if (jfs_inode_cachep == NULL)
904                 return -ENOMEM;
905 
906         /*
907          * Metapage initialization
908          */
909         rc = metapage_init();
910         if (rc) {
911                 jfs_err("metapage_init failed w/rc = %d", rc);
912                 goto free_slab;
913         }
914 
915         /*
916          * Transaction Manager initialization
917          */
918         rc = txInit();
919         if (rc) {
920                 jfs_err("txInit failed w/rc = %d", rc);
921                 goto free_metapage;
922         }
923 
924         /*
925          * I/O completion thread (endio)
926          */
927         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
928         if (IS_ERR(jfsIOthread)) {
929                 rc = PTR_ERR(jfsIOthread);
930                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
931                 goto end_txmngr;
932         }
933 
934         if (commit_threads < 1)
935                 commit_threads = num_online_cpus();
936         if (commit_threads > MAX_COMMIT_THREADS)
937                 commit_threads = MAX_COMMIT_THREADS;
938 
939         for (i = 0; i < commit_threads; i++) {
940                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
941                                                  "jfsCommit");
942                 if (IS_ERR(jfsCommitThread[i])) {
943                         rc = PTR_ERR(jfsCommitThread[i]);
944                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
945                         commit_threads = i;
946                         goto kill_committask;
947                 }
948         }
949 
950         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
951         if (IS_ERR(jfsSyncThread)) {
952                 rc = PTR_ERR(jfsSyncThread);
953                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
954                 goto kill_committask;
955         }
956 
957 #ifdef PROC_FS_JFS
958         jfs_proc_init();
959 #endif
960 
961         rc = register_filesystem(&jfs_fs_type);
962         if (!rc)
963                 return 0;
964 
965 #ifdef PROC_FS_JFS
966         jfs_proc_clean();
967 #endif
968         kthread_stop(jfsSyncThread);
969 kill_committask:
970         for (i = 0; i < commit_threads; i++)
971                 kthread_stop(jfsCommitThread[i]);
972         kthread_stop(jfsIOthread);
973 end_txmngr:
974         txExit();
975 free_metapage:
976         metapage_exit();
977 free_slab:
978         kmem_cache_destroy(jfs_inode_cachep);
979         return rc;
980 }
981 
982 static void __exit exit_jfs_fs(void)
983 {
984         int i;
985 
986         jfs_info("exit_jfs_fs called");
987 
988         txExit();
989         metapage_exit();
990 
991         kthread_stop(jfsIOthread);
992         for (i = 0; i < commit_threads; i++)
993                 kthread_stop(jfsCommitThread[i]);
994         kthread_stop(jfsSyncThread);
995 #ifdef PROC_FS_JFS
996         jfs_proc_clean();
997 #endif
998         unregister_filesystem(&jfs_fs_type);
999 
1000         /*
1001          * Make sure all delayed rcu free inodes are flushed before we
1002          * destroy cache.
1003          */
1004         rcu_barrier();
1005         kmem_cache_destroy(jfs_inode_cachep);
1006 }
1007 
1008 module_init(init_jfs_fs)
1009 module_exit(exit_jfs_fs)
1010 

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