Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

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         return &jfs_inode->vfs_inode;
121 }
122 
123 static void jfs_i_callback(struct rcu_head *head)
124 {
125         struct inode *inode = container_of(head, struct inode, i_rcu);
126         struct jfs_inode_info *ji = JFS_IP(inode);
127         kmem_cache_free(jfs_inode_cachep, ji);
128 }
129 
130 static void jfs_destroy_inode(struct inode *inode)
131 {
132         struct jfs_inode_info *ji = JFS_IP(inode);
133 
134         BUG_ON(!list_empty(&ji->anon_inode_list));
135 
136         spin_lock_irq(&ji->ag_lock);
137         if (ji->active_ag != -1) {
138                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
139                 atomic_dec(&bmap->db_active[ji->active_ag]);
140                 ji->active_ag = -1;
141         }
142         spin_unlock_irq(&ji->ag_lock);
143         call_rcu(&inode->i_rcu, jfs_i_callback);
144 }
145 
146 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
147 {
148         struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
149         s64 maxinodes;
150         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
151 
152         jfs_info("In jfs_statfs");
153         buf->f_type = JFS_SUPER_MAGIC;
154         buf->f_bsize = sbi->bsize;
155         buf->f_blocks = sbi->bmap->db_mapsize;
156         buf->f_bfree = sbi->bmap->db_nfree;
157         buf->f_bavail = sbi->bmap->db_nfree;
158         /*
159          * If we really return the number of allocated & free inodes, some
160          * applications will fail because they won't see enough free inodes.
161          * We'll try to calculate some guess as to how many inodes we can
162          * really allocate
163          *
164          * buf->f_files = atomic_read(&imap->im_numinos);
165          * buf->f_ffree = atomic_read(&imap->im_numfree);
166          */
167         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
168                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
169                          << L2INOSPEREXT), (s64) 0xffffffffLL);
170         buf->f_files = maxinodes;
171         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
172                                     atomic_read(&imap->im_numfree));
173         buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
174         buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
175                                         sizeof(sbi->uuid)/2);
176 
177         buf->f_namelen = JFS_NAME_MAX;
178         return 0;
179 }
180 
181 static void jfs_put_super(struct super_block *sb)
182 {
183         struct jfs_sb_info *sbi = JFS_SBI(sb);
184         int rc;
185 
186         jfs_info("In jfs_put_super");
187 
188         dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
189 
190         rc = jfs_umount(sb);
191         if (rc)
192                 jfs_err("jfs_umount failed with return code %d", rc);
193 
194         unload_nls(sbi->nls_tab);
195 
196         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
197         iput(sbi->direct_inode);
198 
199         kfree(sbi);
200 }
201 
202 enum {
203         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
204         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
205         Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask,
206         Opt_discard, Opt_nodiscard, Opt_discard_minblk
207 };
208 
209 static const match_table_t tokens = {
210         {Opt_integrity, "integrity"},
211         {Opt_nointegrity, "nointegrity"},
212         {Opt_iocharset, "iocharset=%s"},
213         {Opt_resize, "resize=%u"},
214         {Opt_resize_nosize, "resize"},
215         {Opt_errors, "errors=%s"},
216         {Opt_ignore, "noquota"},
217         {Opt_ignore, "quota"},
218         {Opt_usrquota, "usrquota"},
219         {Opt_grpquota, "grpquota"},
220         {Opt_uid, "uid=%u"},
221         {Opt_gid, "gid=%u"},
222         {Opt_umask, "umask=%u"},
223         {Opt_discard, "discard"},
224         {Opt_nodiscard, "nodiscard"},
225         {Opt_discard_minblk, "discard=%u"},
226         {Opt_err, NULL}
227 };
228 
229 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
230                          int *flag)
231 {
232         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
233         char *p;
234         struct jfs_sb_info *sbi = JFS_SBI(sb);
235 
236         *newLVSize = 0;
237 
238         if (!options)
239                 return 1;
240 
241         while ((p = strsep(&options, ",")) != NULL) {
242                 substring_t args[MAX_OPT_ARGS];
243                 int token;
244                 if (!*p)
245                         continue;
246 
247                 token = match_token(p, tokens, args);
248                 switch (token) {
249                 case Opt_integrity:
250                         *flag &= ~JFS_NOINTEGRITY;
251                         break;
252                 case Opt_nointegrity:
253                         *flag |= JFS_NOINTEGRITY;
254                         break;
255                 case Opt_ignore:
256                         /* Silently ignore the quota options */
257                         /* Don't do anything ;-) */
258                         break;
259                 case Opt_iocharset:
260                         if (nls_map && nls_map != (void *) -1)
261                                 unload_nls(nls_map);
262                         if (!strcmp(args[0].from, "none"))
263                                 nls_map = NULL;
264                         else {
265                                 nls_map = load_nls(args[0].from);
266                                 if (!nls_map) {
267                                         pr_err("JFS: charset not found\n");
268                                         goto cleanup;
269                                 }
270                         }
271                         break;
272                 case Opt_resize:
273                 {
274                         char *resize = args[0].from;
275                         int rc = kstrtoll(resize, 0, newLVSize);
276 
277                         if (rc)
278                                 goto cleanup;
279                         break;
280                 }
281                 case Opt_resize_nosize:
282                 {
283                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
284                                 sb->s_blocksize_bits;
285                         if (*newLVSize == 0)
286                                 pr_err("JFS: Cannot determine volume size\n");
287                         break;
288                 }
289                 case Opt_errors:
290                 {
291                         char *errors = args[0].from;
292                         if (!errors || !*errors)
293                                 goto cleanup;
294                         if (!strcmp(errors, "continue")) {
295                                 *flag &= ~JFS_ERR_REMOUNT_RO;
296                                 *flag &= ~JFS_ERR_PANIC;
297                                 *flag |= JFS_ERR_CONTINUE;
298                         } else if (!strcmp(errors, "remount-ro")) {
299                                 *flag &= ~JFS_ERR_CONTINUE;
300                                 *flag &= ~JFS_ERR_PANIC;
301                                 *flag |= JFS_ERR_REMOUNT_RO;
302                         } else if (!strcmp(errors, "panic")) {
303                                 *flag &= ~JFS_ERR_CONTINUE;
304                                 *flag &= ~JFS_ERR_REMOUNT_RO;
305                                 *flag |= JFS_ERR_PANIC;
306                         } else {
307                                 pr_err("JFS: %s is an invalid error handler\n",
308                                        errors);
309                                 goto cleanup;
310                         }
311                         break;
312                 }
313 
314 #ifdef CONFIG_QUOTA
315                 case Opt_quota:
316                 case Opt_usrquota:
317                         *flag |= JFS_USRQUOTA;
318                         break;
319                 case Opt_grpquota:
320                         *flag |= JFS_GRPQUOTA;
321                         break;
322 #else
323                 case Opt_usrquota:
324                 case Opt_grpquota:
325                 case Opt_quota:
326                         pr_err("JFS: quota operations not supported\n");
327                         break;
328 #endif
329                 case Opt_uid:
330                 {
331                         char *uid = args[0].from;
332                         uid_t val;
333                         int rc = kstrtouint(uid, 0, &val);
334 
335                         if (rc)
336                                 goto cleanup;
337                         sbi->uid = make_kuid(current_user_ns(), val);
338                         if (!uid_valid(sbi->uid))
339                                 goto cleanup;
340                         break;
341                 }
342 
343                 case Opt_gid:
344                 {
345                         char *gid = args[0].from;
346                         gid_t val;
347                         int rc = kstrtouint(gid, 0, &val);
348 
349                         if (rc)
350                                 goto cleanup;
351                         sbi->gid = make_kgid(current_user_ns(), val);
352                         if (!gid_valid(sbi->gid))
353                                 goto cleanup;
354                         break;
355                 }
356 
357                 case Opt_umask:
358                 {
359                         char *umask = args[0].from;
360                         int rc = kstrtouint(umask, 8, &sbi->umask);
361 
362                         if (rc)
363                                 goto cleanup;
364                         if (sbi->umask & ~0777) {
365                                 pr_err("JFS: Invalid value of umask\n");
366                                 goto cleanup;
367                         }
368                         break;
369                 }
370 
371                 case Opt_discard:
372                 {
373                         struct request_queue *q = bdev_get_queue(sb->s_bdev);
374                         /* if set to 1, even copying files will cause
375                          * trimming :O
376                          * -> user has more control over the online trimming
377                          */
378                         sbi->minblks_trim = 64;
379                         if (blk_queue_discard(q))
380                                 *flag |= JFS_DISCARD;
381                         else
382                                 pr_err("JFS: discard option not supported on device\n");
383                         break;
384                 }
385 
386                 case Opt_nodiscard:
387                         *flag &= ~JFS_DISCARD;
388                         break;
389 
390                 case Opt_discard_minblk:
391                 {
392                         struct request_queue *q = bdev_get_queue(sb->s_bdev);
393                         char *minblks_trim = args[0].from;
394                         int rc;
395                         if (blk_queue_discard(q)) {
396                                 *flag |= JFS_DISCARD;
397                                 rc = kstrtouint(minblks_trim, 0,
398                                                 &sbi->minblks_trim);
399                                 if (rc)
400                                         goto cleanup;
401                         } else
402                                 pr_err("JFS: discard option not supported on device\n");
403                         break;
404                 }
405 
406                 default:
407                         printk("jfs: Unrecognized mount option \"%s\" or missing value\n",
408                                p);
409                         goto cleanup;
410                 }
411         }
412 
413         if (nls_map != (void *) -1) {
414                 /* Discard old (if remount) */
415                 unload_nls(sbi->nls_tab);
416                 sbi->nls_tab = nls_map;
417         }
418         return 1;
419 
420 cleanup:
421         if (nls_map && nls_map != (void *) -1)
422                 unload_nls(nls_map);
423         return 0;
424 }
425 
426 static int jfs_remount(struct super_block *sb, int *flags, char *data)
427 {
428         s64 newLVSize = 0;
429         int rc = 0;
430         int flag = JFS_SBI(sb)->flag;
431         int ret;
432 
433         sync_filesystem(sb);
434         if (!parse_options(data, sb, &newLVSize, &flag))
435                 return -EINVAL;
436 
437         if (newLVSize) {
438                 if (sb->s_flags & MS_RDONLY) {
439                         pr_err("JFS: resize requires volume to be mounted read-write\n");
440                         return -EROFS;
441                 }
442                 rc = jfs_extendfs(sb, newLVSize, 0);
443                 if (rc)
444                         return rc;
445         }
446 
447         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
448                 /*
449                  * Invalidate any previously read metadata.  fsck may have
450                  * changed the on-disk data since we mounted r/o
451                  */
452                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
453 
454                 JFS_SBI(sb)->flag = flag;
455                 ret = jfs_mount_rw(sb, 1);
456 
457                 /* mark the fs r/w for quota activity */
458                 sb->s_flags &= ~MS_RDONLY;
459 
460                 dquot_resume(sb, -1);
461                 return ret;
462         }
463         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
464                 rc = dquot_suspend(sb, -1);
465                 if (rc < 0)
466                         return rc;
467                 rc = jfs_umount_rw(sb);
468                 JFS_SBI(sb)->flag = flag;
469                 return rc;
470         }
471         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
472                 if (!(sb->s_flags & MS_RDONLY)) {
473                         rc = jfs_umount_rw(sb);
474                         if (rc)
475                                 return rc;
476 
477                         JFS_SBI(sb)->flag = flag;
478                         ret = jfs_mount_rw(sb, 1);
479                         return ret;
480                 }
481         JFS_SBI(sb)->flag = flag;
482 
483         return 0;
484 }
485 
486 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
487 {
488         struct jfs_sb_info *sbi;
489         struct inode *inode;
490         int rc;
491         s64 newLVSize = 0;
492         int flag, ret = -EINVAL;
493 
494         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
495 
496         if (!new_valid_dev(sb->s_bdev->bd_dev))
497                 return -EOVERFLOW;
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 #endif
541 
542         /*
543          * Initialize direct-mapping inode/address-space
544          */
545         inode = new_inode(sb);
546         if (inode == NULL) {
547                 ret = -ENOMEM;
548                 goto out_unload;
549         }
550         inode->i_ino = 0;
551         inode->i_size = sb->s_bdev->bd_inode->i_size;
552         inode->i_mapping->a_ops = &jfs_metapage_aops;
553         hlist_add_fake(&inode->i_hash);
554         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
555 
556         sbi->direct_inode = inode;
557 
558         rc = jfs_mount(sb);
559         if (rc) {
560                 if (!silent)
561                         jfs_err("jfs_mount failed w/return code = %d", rc);
562                 goto out_mount_failed;
563         }
564         if (sb->s_flags & MS_RDONLY)
565                 sbi->log = NULL;
566         else {
567                 rc = jfs_mount_rw(sb, 0);
568                 if (rc) {
569                         if (!silent) {
570                                 jfs_err("jfs_mount_rw failed, return code = %d",
571                                         rc);
572                         }
573                         goto out_no_rw;
574                 }
575         }
576 
577         sb->s_magic = JFS_SUPER_MAGIC;
578 
579         if (sbi->mntflag & JFS_OS2)
580                 sb->s_d_op = &jfs_ci_dentry_operations;
581 
582         inode = jfs_iget(sb, ROOT_I);
583         if (IS_ERR(inode)) {
584                 ret = PTR_ERR(inode);
585                 goto out_no_rw;
586         }
587         sb->s_root = d_make_root(inode);
588         if (!sb->s_root)
589                 goto out_no_root;
590 
591         /* logical blocks are represented by 40 bits in pxd_t, etc. */
592         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
593 #if BITS_PER_LONG == 32
594         /*
595          * Page cache is indexed by long.
596          * I would use MAX_LFS_FILESIZE, but it's only half as big
597          */
598         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1,
599                              (u64)sb->s_maxbytes);
600 #endif
601         sb->s_time_gran = 1;
602         return 0;
603 
604 out_no_root:
605         jfs_err("jfs_read_super: get root dentry failed");
606 
607 out_no_rw:
608         rc = jfs_umount(sb);
609         if (rc)
610                 jfs_err("jfs_umount failed with return code %d", rc);
611 out_mount_failed:
612         filemap_write_and_wait(sbi->direct_inode->i_mapping);
613         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
614         make_bad_inode(sbi->direct_inode);
615         iput(sbi->direct_inode);
616         sbi->direct_inode = NULL;
617 out_unload:
618         if (sbi->nls_tab)
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         mutex_lock(&inode->i_mutex);
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                 mutex_unlock(&inode->i_mutex);
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         mutex_unlock(&inode->i_mutex);
836         return len - towrite;
837 }
838 
839 #endif
840 
841 static const struct super_operations jfs_super_operations = {
842         .alloc_inode    = jfs_alloc_inode,
843         .destroy_inode  = jfs_destroy_inode,
844         .dirty_inode    = jfs_dirty_inode,
845         .write_inode    = jfs_write_inode,
846         .evict_inode    = jfs_evict_inode,
847         .put_super      = jfs_put_super,
848         .sync_fs        = jfs_sync_fs,
849         .freeze_fs      = jfs_freeze,
850         .unfreeze_fs    = jfs_unfreeze,
851         .statfs         = jfs_statfs,
852         .remount_fs     = jfs_remount,
853         .show_options   = jfs_show_options,
854 #ifdef CONFIG_QUOTA
855         .quota_read     = jfs_quota_read,
856         .quota_write    = jfs_quota_write,
857 #endif
858 };
859 
860 static const struct export_operations jfs_export_operations = {
861         .fh_to_dentry   = jfs_fh_to_dentry,
862         .fh_to_parent   = jfs_fh_to_parent,
863         .get_parent     = jfs_get_parent,
864 };
865 
866 static struct file_system_type jfs_fs_type = {
867         .owner          = THIS_MODULE,
868         .name           = "jfs",
869         .mount          = jfs_do_mount,
870         .kill_sb        = kill_block_super,
871         .fs_flags       = FS_REQUIRES_DEV,
872 };
873 MODULE_ALIAS_FS("jfs");
874 
875 static void init_once(void *foo)
876 {
877         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
878 
879         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
880         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
881         init_rwsem(&jfs_ip->rdwrlock);
882         mutex_init(&jfs_ip->commit_mutex);
883         init_rwsem(&jfs_ip->xattr_sem);
884         spin_lock_init(&jfs_ip->ag_lock);
885         jfs_ip->active_ag = -1;
886         inode_init_once(&jfs_ip->vfs_inode);
887 }
888 
889 static int __init init_jfs_fs(void)
890 {
891         int i;
892         int rc;
893 
894         jfs_inode_cachep =
895             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
896                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
897                             init_once);
898         if (jfs_inode_cachep == NULL)
899                 return -ENOMEM;
900 
901         /*
902          * Metapage initialization
903          */
904         rc = metapage_init();
905         if (rc) {
906                 jfs_err("metapage_init failed w/rc = %d", rc);
907                 goto free_slab;
908         }
909 
910         /*
911          * Transaction Manager initialization
912          */
913         rc = txInit();
914         if (rc) {
915                 jfs_err("txInit failed w/rc = %d", rc);
916                 goto free_metapage;
917         }
918 
919         /*
920          * I/O completion thread (endio)
921          */
922         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
923         if (IS_ERR(jfsIOthread)) {
924                 rc = PTR_ERR(jfsIOthread);
925                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
926                 goto end_txmngr;
927         }
928 
929         if (commit_threads < 1)
930                 commit_threads = num_online_cpus();
931         if (commit_threads > MAX_COMMIT_THREADS)
932                 commit_threads = MAX_COMMIT_THREADS;
933 
934         for (i = 0; i < commit_threads; i++) {
935                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
936                                                  "jfsCommit");
937                 if (IS_ERR(jfsCommitThread[i])) {
938                         rc = PTR_ERR(jfsCommitThread[i]);
939                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
940                         commit_threads = i;
941                         goto kill_committask;
942                 }
943         }
944 
945         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
946         if (IS_ERR(jfsSyncThread)) {
947                 rc = PTR_ERR(jfsSyncThread);
948                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
949                 goto kill_committask;
950         }
951 
952 #ifdef PROC_FS_JFS
953         jfs_proc_init();
954 #endif
955 
956         rc = register_filesystem(&jfs_fs_type);
957         if (!rc)
958                 return 0;
959 
960 #ifdef PROC_FS_JFS
961         jfs_proc_clean();
962 #endif
963         kthread_stop(jfsSyncThread);
964 kill_committask:
965         for (i = 0; i < commit_threads; i++)
966                 kthread_stop(jfsCommitThread[i]);
967         kthread_stop(jfsIOthread);
968 end_txmngr:
969         txExit();
970 free_metapage:
971         metapage_exit();
972 free_slab:
973         kmem_cache_destroy(jfs_inode_cachep);
974         return rc;
975 }
976 
977 static void __exit exit_jfs_fs(void)
978 {
979         int i;
980 
981         jfs_info("exit_jfs_fs called");
982 
983         txExit();
984         metapage_exit();
985 
986         kthread_stop(jfsIOthread);
987         for (i = 0; i < commit_threads; i++)
988                 kthread_stop(jfsCommitThread[i]);
989         kthread_stop(jfsSyncThread);
990 #ifdef PROC_FS_JFS
991         jfs_proc_clean();
992 #endif
993         unregister_filesystem(&jfs_fs_type);
994 
995         /*
996          * Make sure all delayed rcu free inodes are flushed before we
997          * destroy cache.
998          */
999         rcu_barrier();
1000         kmem_cache_destroy(jfs_inode_cachep);
1001 }
1002 
1003 module_init(init_jfs_fs)
1004 module_exit(exit_jfs_fs)
1005 

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