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

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  1 /*
  2  *  linux/fs/affs/inode.c
  3  *
  4  *  (c) 1996  Hans-Joachim Widmaier - Rewritten
  5  *
  6  *  (C) 1993  Ray Burr - Modified for Amiga FFS filesystem.
  7  *
  8  *  (C) 1992  Eric Youngdale Modified for ISO 9660 filesystem.
  9  *
 10  *  (C) 1991  Linus Torvalds - minix filesystem
 11  */
 12 
 13 #include <linux/module.h>
 14 #include <linux/init.h>
 15 #include <linux/statfs.h>
 16 #include <linux/parser.h>
 17 #include <linux/magic.h>
 18 #include <linux/sched.h>
 19 #include <linux/slab.h>
 20 #include <linux/writeback.h>
 21 #include "affs.h"
 22 
 23 extern struct timezone sys_tz;
 24 
 25 static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
 26 static int affs_remount (struct super_block *sb, int *flags, char *data);
 27 
 28 static void
 29 affs_commit_super(struct super_block *sb, int wait)
 30 {
 31         struct affs_sb_info *sbi = AFFS_SB(sb);
 32         struct buffer_head *bh = sbi->s_root_bh;
 33         struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
 34 
 35         lock_buffer(bh);
 36         secs_to_datestamp(get_seconds(), &tail->disk_change);
 37         affs_fix_checksum(sb, bh);
 38         unlock_buffer(bh);
 39 
 40         mark_buffer_dirty(bh);
 41         if (wait)
 42                 sync_dirty_buffer(bh);
 43 }
 44 
 45 static void
 46 affs_put_super(struct super_block *sb)
 47 {
 48         struct affs_sb_info *sbi = AFFS_SB(sb);
 49         pr_debug("AFFS: put_super()\n");
 50 
 51         cancel_delayed_work_sync(&sbi->sb_work);
 52         kfree(sbi->s_prefix);
 53         affs_free_bitmap(sb);
 54         affs_brelse(sbi->s_root_bh);
 55         kfree(sbi);
 56         sb->s_fs_info = NULL;
 57 }
 58 
 59 static int
 60 affs_sync_fs(struct super_block *sb, int wait)
 61 {
 62         affs_commit_super(sb, wait);
 63         return 0;
 64 }
 65 
 66 static void flush_superblock(struct work_struct *work)
 67 {
 68         struct affs_sb_info *sbi;
 69         struct super_block *sb;
 70 
 71         sbi = container_of(work, struct affs_sb_info, sb_work.work);
 72         sb = sbi->sb;
 73 
 74         spin_lock(&sbi->work_lock);
 75         sbi->work_queued = 0;
 76         spin_unlock(&sbi->work_lock);
 77 
 78         affs_commit_super(sb, 1);
 79 }
 80 
 81 void affs_mark_sb_dirty(struct super_block *sb)
 82 {
 83         struct affs_sb_info *sbi = AFFS_SB(sb);
 84         unsigned long delay;
 85 
 86         if (sb->s_flags & MS_RDONLY)
 87                return;
 88 
 89         spin_lock(&sbi->work_lock);
 90         if (!sbi->work_queued) {
 91                delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 92                queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
 93                sbi->work_queued = 1;
 94         }
 95         spin_unlock(&sbi->work_lock);
 96 }
 97 
 98 static struct kmem_cache * affs_inode_cachep;
 99 
100 static struct inode *affs_alloc_inode(struct super_block *sb)
101 {
102         struct affs_inode_info *i;
103 
104         i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
105         if (!i)
106                 return NULL;
107 
108         i->vfs_inode.i_version = 1;
109         i->i_lc = NULL;
110         i->i_ext_bh = NULL;
111         i->i_pa_cnt = 0;
112 
113         return &i->vfs_inode;
114 }
115 
116 static void affs_i_callback(struct rcu_head *head)
117 {
118         struct inode *inode = container_of(head, struct inode, i_rcu);
119         kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
120 }
121 
122 static void affs_destroy_inode(struct inode *inode)
123 {
124         call_rcu(&inode->i_rcu, affs_i_callback);
125 }
126 
127 static void init_once(void *foo)
128 {
129         struct affs_inode_info *ei = (struct affs_inode_info *) foo;
130 
131         sema_init(&ei->i_link_lock, 1);
132         sema_init(&ei->i_ext_lock, 1);
133         inode_init_once(&ei->vfs_inode);
134 }
135 
136 static int init_inodecache(void)
137 {
138         affs_inode_cachep = kmem_cache_create("affs_inode_cache",
139                                              sizeof(struct affs_inode_info),
140                                              0, (SLAB_RECLAIM_ACCOUNT|
141                                                 SLAB_MEM_SPREAD),
142                                              init_once);
143         if (affs_inode_cachep == NULL)
144                 return -ENOMEM;
145         return 0;
146 }
147 
148 static void destroy_inodecache(void)
149 {
150         kmem_cache_destroy(affs_inode_cachep);
151 }
152 
153 static const struct super_operations affs_sops = {
154         .alloc_inode    = affs_alloc_inode,
155         .destroy_inode  = affs_destroy_inode,
156         .write_inode    = affs_write_inode,
157         .evict_inode    = affs_evict_inode,
158         .put_super      = affs_put_super,
159         .sync_fs        = affs_sync_fs,
160         .statfs         = affs_statfs,
161         .remount_fs     = affs_remount,
162         .show_options   = generic_show_options,
163 };
164 
165 enum {
166         Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
167         Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
168         Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
169 };
170 
171 static const match_table_t tokens = {
172         {Opt_bs, "bs=%u"},
173         {Opt_mode, "mode=%o"},
174         {Opt_mufs, "mufs"},
175         {Opt_prefix, "prefix=%s"},
176         {Opt_protect, "protect"},
177         {Opt_reserved, "reserved=%u"},
178         {Opt_root, "root=%u"},
179         {Opt_setgid, "setgid=%u"},
180         {Opt_setuid, "setuid=%u"},
181         {Opt_verbose, "verbose"},
182         {Opt_volume, "volume=%s"},
183         {Opt_ignore, "grpquota"},
184         {Opt_ignore, "noquota"},
185         {Opt_ignore, "quota"},
186         {Opt_ignore, "usrquota"},
187         {Opt_err, NULL},
188 };
189 
190 static int
191 parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
192                 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
193 {
194         char *p;
195         substring_t args[MAX_OPT_ARGS];
196 
197         /* Fill in defaults */
198 
199         *uid        = current_uid();
200         *gid        = current_gid();
201         *reserved   = 2;
202         *root       = -1;
203         *blocksize  = -1;
204         volume[0]   = ':';
205         volume[1]   = 0;
206         *mount_opts = 0;
207         if (!options)
208                 return 1;
209 
210         while ((p = strsep(&options, ",")) != NULL) {
211                 int token, n, option;
212                 if (!*p)
213                         continue;
214 
215                 token = match_token(p, tokens, args);
216                 switch (token) {
217                 case Opt_bs:
218                         if (match_int(&args[0], &n))
219                                 return 0;
220                         if (n != 512 && n != 1024 && n != 2048
221                             && n != 4096) {
222                                 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
223                                 return 0;
224                         }
225                         *blocksize = n;
226                         break;
227                 case Opt_mode:
228                         if (match_octal(&args[0], &option))
229                                 return 0;
230                         *mode = option & 0777;
231                         *mount_opts |= SF_SETMODE;
232                         break;
233                 case Opt_mufs:
234                         *mount_opts |= SF_MUFS;
235                         break;
236                 case Opt_prefix:
237                         *prefix = match_strdup(&args[0]);
238                         if (!*prefix)
239                                 return 0;
240                         *mount_opts |= SF_PREFIX;
241                         break;
242                 case Opt_protect:
243                         *mount_opts |= SF_IMMUTABLE;
244                         break;
245                 case Opt_reserved:
246                         if (match_int(&args[0], reserved))
247                                 return 0;
248                         break;
249                 case Opt_root:
250                         if (match_int(&args[0], root))
251                                 return 0;
252                         break;
253                 case Opt_setgid:
254                         if (match_int(&args[0], &option))
255                                 return 0;
256                         *gid = option;
257                         *mount_opts |= SF_SETGID;
258                         break;
259                 case Opt_setuid:
260                         if (match_int(&args[0], &option))
261                                 return 0;
262                         *uid = option;
263                         *mount_opts |= SF_SETUID;
264                         break;
265                 case Opt_verbose:
266                         *mount_opts |= SF_VERBOSE;
267                         break;
268                 case Opt_volume: {
269                         char *vol = match_strdup(&args[0]);
270                         if (!vol)
271                                 return 0;
272                         strlcpy(volume, vol, 32);
273                         kfree(vol);
274                         break;
275                 }
276                 case Opt_ignore:
277                         /* Silently ignore the quota options */
278                         break;
279                 default:
280                         printk("AFFS: Unrecognized mount option \"%s\" "
281                                         "or missing value\n", p);
282                         return 0;
283                 }
284         }
285         return 1;
286 }
287 
288 /* This function definitely needs to be split up. Some fine day I'll
289  * hopefully have the guts to do so. Until then: sorry for the mess.
290  */
291 
292 static int affs_fill_super(struct super_block *sb, void *data, int silent)
293 {
294         struct affs_sb_info     *sbi;
295         struct buffer_head      *root_bh = NULL;
296         struct buffer_head      *boot_bh;
297         struct inode            *root_inode = NULL;
298         s32                      root_block;
299         int                      size, blocksize;
300         u32                      chksum;
301         int                      num_bm;
302         int                      i, j;
303         s32                      key;
304         uid_t                    uid;
305         gid_t                    gid;
306         int                      reserved;
307         unsigned long            mount_flags;
308         int                      tmp_flags;     /* fix remount prototype... */
309         u8                       sig[4];
310         int                      ret = -EINVAL;
311 
312         save_mount_options(sb, data);
313 
314         pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
315 
316         sb->s_magic             = AFFS_SUPER_MAGIC;
317         sb->s_op                = &affs_sops;
318         sb->s_flags |= MS_NODIRATIME;
319 
320         sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
321         if (!sbi)
322                 return -ENOMEM;
323 
324         sb->s_fs_info = sbi;
325         sbi->sb = sb;
326         mutex_init(&sbi->s_bmlock);
327         spin_lock_init(&sbi->symlink_lock);
328         spin_lock_init(&sbi->work_lock);
329         INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
330 
331         if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
332                                 &blocksize,&sbi->s_prefix,
333                                 sbi->s_volume, &mount_flags)) {
334                 printk(KERN_ERR "AFFS: Error parsing options\n");
335                 kfree(sbi->s_prefix);
336                 kfree(sbi);
337                 return -EINVAL;
338         }
339         /* N.B. after this point s_prefix must be released */
340 
341         sbi->s_flags   = mount_flags;
342         sbi->s_mode    = i;
343         sbi->s_uid     = uid;
344         sbi->s_gid     = gid;
345         sbi->s_reserved= reserved;
346 
347         /* Get the size of the device in 512-byte blocks.
348          * If we later see that the partition uses bigger
349          * blocks, we will have to change it.
350          */
351 
352         size = sb->s_bdev->bd_inode->i_size >> 9;
353         pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
354 
355         affs_set_blocksize(sb, PAGE_SIZE);
356         /* Try to find root block. Its location depends on the block size. */
357 
358         i = 512;
359         j = 4096;
360         if (blocksize > 0) {
361                 i = j = blocksize;
362                 size = size / (blocksize / 512);
363         }
364         for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
365                 sbi->s_root_block = root_block;
366                 if (root_block < 0)
367                         sbi->s_root_block = (reserved + size - 1) / 2;
368                 pr_debug("AFFS: setting blocksize to %d\n", blocksize);
369                 affs_set_blocksize(sb, blocksize);
370                 sbi->s_partition_size = size;
371 
372                 /* The root block location that was calculated above is not
373                  * correct if the partition size is an odd number of 512-
374                  * byte blocks, which will be rounded down to a number of
375                  * 1024-byte blocks, and if there were an even number of
376                  * reserved blocks. Ideally, all partition checkers should
377                  * report the real number of blocks of the real blocksize,
378                  * but since this just cannot be done, we have to try to
379                  * find the root block anyways. In the above case, it is one
380                  * block behind the calculated one. So we check this one, too.
381                  */
382                 for (num_bm = 0; num_bm < 2; num_bm++) {
383                         pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
384                                 "size=%d, reserved=%d\n",
385                                 sb->s_id,
386                                 sbi->s_root_block + num_bm,
387                                 blocksize, size, reserved);
388                         root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
389                         if (!root_bh)
390                                 continue;
391                         if (!affs_checksum_block(sb, root_bh) &&
392                             be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
393                             be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
394                                 sbi->s_hashsize    = blocksize / 4 - 56;
395                                 sbi->s_root_block += num_bm;
396                                 key                        = 1;
397                                 goto got_root;
398                         }
399                         affs_brelse(root_bh);
400                         root_bh = NULL;
401                 }
402         }
403         if (!silent)
404                 printk(KERN_ERR "AFFS: No valid root block on device %s\n",
405                         sb->s_id);
406         goto out_error;
407 
408         /* N.B. after this point bh must be released */
409 got_root:
410         root_block = sbi->s_root_block;
411 
412         /* Find out which kind of FS we have */
413         boot_bh = sb_bread(sb, 0);
414         if (!boot_bh) {
415                 printk(KERN_ERR "AFFS: Cannot read boot block\n");
416                 goto out_error;
417         }
418         memcpy(sig, boot_bh->b_data, 4);
419         brelse(boot_bh);
420         chksum = be32_to_cpu(*(__be32 *)sig);
421 
422         /* Dircache filesystems are compatible with non-dircache ones
423          * when reading. As long as they aren't supported, writing is
424          * not recommended.
425          */
426         if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
427              || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
428                 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
429                         sb->s_id);
430                 sb->s_flags |= MS_RDONLY;
431         }
432         switch (chksum) {
433                 case MUFS_FS:
434                 case MUFS_INTLFFS:
435                 case MUFS_DCFFS:
436                         sbi->s_flags |= SF_MUFS;
437                         /* fall thru */
438                 case FS_INTLFFS:
439                 case FS_DCFFS:
440                         sbi->s_flags |= SF_INTL;
441                         break;
442                 case MUFS_FFS:
443                         sbi->s_flags |= SF_MUFS;
444                         break;
445                 case FS_FFS:
446                         break;
447                 case MUFS_OFS:
448                         sbi->s_flags |= SF_MUFS;
449                         /* fall thru */
450                 case FS_OFS:
451                         sbi->s_flags |= SF_OFS;
452                         sb->s_flags |= MS_NOEXEC;
453                         break;
454                 case MUFS_DCOFS:
455                 case MUFS_INTLOFS:
456                         sbi->s_flags |= SF_MUFS;
457                 case FS_DCOFS:
458                 case FS_INTLOFS:
459                         sbi->s_flags |= SF_INTL | SF_OFS;
460                         sb->s_flags |= MS_NOEXEC;
461                         break;
462                 default:
463                         printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
464                                 sb->s_id, chksum);
465                         goto out_error;
466         }
467 
468         if (mount_flags & SF_VERBOSE) {
469                 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
470                 printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
471                         len > 31 ? 31 : len,
472                         AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
473                         sig, sig[3] + '', blocksize);
474         }
475 
476         sb->s_flags |= MS_NODEV | MS_NOSUID;
477 
478         sbi->s_data_blksize = sb->s_blocksize;
479         if (sbi->s_flags & SF_OFS)
480                 sbi->s_data_blksize -= 24;
481 
482         /* Keep super block in cache */
483         sbi->s_root_bh = root_bh;
484         /* N.B. after this point s_root_bh must be released */
485 
486         tmp_flags = sb->s_flags;
487         if (affs_init_bitmap(sb, &tmp_flags))
488                 goto out_error;
489         sb->s_flags = tmp_flags;
490 
491         /* set up enough so that it can read an inode */
492 
493         root_inode = affs_iget(sb, root_block);
494         if (IS_ERR(root_inode)) {
495                 ret = PTR_ERR(root_inode);
496                 goto out_error;
497         }
498 
499         if (AFFS_SB(sb)->s_flags & SF_INTL)
500                 sb->s_d_op = &affs_intl_dentry_operations;
501         else
502                 sb->s_d_op = &affs_dentry_operations;
503 
504         sb->s_root = d_make_root(root_inode);
505         if (!sb->s_root) {
506                 printk(KERN_ERR "AFFS: Get root inode failed\n");
507                 goto out_error;
508         }
509 
510         pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
511         return 0;
512 
513         /*
514          * Begin the cascaded cleanup ...
515          */
516 out_error:
517         kfree(sbi->s_bitmap);
518         affs_brelse(root_bh);
519         kfree(sbi->s_prefix);
520         kfree(sbi);
521         sb->s_fs_info = NULL;
522         return ret;
523 }
524 
525 static int
526 affs_remount(struct super_block *sb, int *flags, char *data)
527 {
528         struct affs_sb_info     *sbi = AFFS_SB(sb);
529         int                      blocksize;
530         uid_t                    uid;
531         gid_t                    gid;
532         int                      mode;
533         int                      reserved;
534         int                      root_block;
535         unsigned long            mount_flags;
536         int                      res = 0;
537         char                    *new_opts = kstrdup(data, GFP_KERNEL);
538         char                     volume[32];
539         char                    *prefix = NULL;
540 
541         pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
542 
543         *flags |= MS_NODIRATIME;
544 
545         memcpy(volume, sbi->s_volume, 32);
546         if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
547                            &blocksize, &prefix, volume,
548                            &mount_flags)) {
549                 kfree(prefix);
550                 kfree(new_opts);
551                 return -EINVAL;
552         }
553 
554         flush_delayed_work_sync(&sbi->sb_work);
555         replace_mount_options(sb, new_opts);
556 
557         sbi->s_flags = mount_flags;
558         sbi->s_mode  = mode;
559         sbi->s_uid   = uid;
560         sbi->s_gid   = gid;
561         /* protect against readers */
562         spin_lock(&sbi->symlink_lock);
563         if (prefix) {
564                 kfree(sbi->s_prefix);
565                 sbi->s_prefix = prefix;
566         }
567         memcpy(sbi->s_volume, volume, 32);
568         spin_unlock(&sbi->symlink_lock);
569 
570         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
571                 return 0;
572 
573         if (*flags & MS_RDONLY)
574                 affs_free_bitmap(sb);
575         else
576                 res = affs_init_bitmap(sb, flags);
577 
578         return res;
579 }
580 
581 static int
582 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
583 {
584         struct super_block *sb = dentry->d_sb;
585         int              free;
586         u64              id = huge_encode_dev(sb->s_bdev->bd_dev);
587 
588         pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
589              AFFS_SB(sb)->s_reserved);
590 
591         free          = affs_count_free_blocks(sb);
592         buf->f_type    = AFFS_SUPER_MAGIC;
593         buf->f_bsize   = sb->s_blocksize;
594         buf->f_blocks  = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
595         buf->f_bfree   = free;
596         buf->f_bavail  = free;
597         buf->f_fsid.val[0] = (u32)id;
598         buf->f_fsid.val[1] = (u32)(id >> 32);
599         buf->f_namelen = 30;
600         return 0;
601 }
602 
603 static struct dentry *affs_mount(struct file_system_type *fs_type,
604         int flags, const char *dev_name, void *data)
605 {
606         return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
607 }
608 
609 static struct file_system_type affs_fs_type = {
610         .owner          = THIS_MODULE,
611         .name           = "affs",
612         .mount          = affs_mount,
613         .kill_sb        = kill_block_super,
614         .fs_flags       = FS_REQUIRES_DEV,
615 };
616 
617 static int __init init_affs_fs(void)
618 {
619         int err = init_inodecache();
620         if (err)
621                 goto out1;
622         err = register_filesystem(&affs_fs_type);
623         if (err)
624                 goto out;
625         return 0;
626 out:
627         destroy_inodecache();
628 out1:
629         return err;
630 }
631 
632 static void __exit exit_affs_fs(void)
633 {
634         unregister_filesystem(&affs_fs_type);
635         destroy_inodecache();
636 }
637 
638 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
639 MODULE_LICENSE("GPL");
640 
641 module_init(init_affs_fs)
642 module_exit(exit_affs_fs)
643 

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