2 * linux/fs/affs/inode.c
4 * (c) 1996 Hans-Joachim Widmaier - Rewritten
6 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
8 * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
10 * (C) 1991 Linus Torvalds - minix filesystem
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>
23 extern struct timezone sys_tz;
25 static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
26 static int affs_remount (struct super_block *sb, int *flags, char *data);
29 affs_commit_super(struct super_block *sb, int wait)
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);
36 secs_to_datestamp(get_seconds(), &tail->disk_change);
37 affs_fix_checksum(sb, bh);
40 mark_buffer_dirty(bh);
42 sync_dirty_buffer(bh);
46 affs_put_super(struct super_block *sb)
48 struct affs_sb_info *sbi = AFFS_SB(sb);
49 pr_debug("AFFS: put_super()\n");
51 cancel_delayed_work_sync(&sbi->sb_work);
55 affs_sync_fs(struct super_block *sb, int wait)
57 affs_commit_super(sb, wait);
61 static void flush_superblock(struct work_struct *work)
63 struct affs_sb_info *sbi;
64 struct super_block *sb;
66 sbi = container_of(work, struct affs_sb_info, sb_work.work);
69 spin_lock(&sbi->work_lock);
71 spin_unlock(&sbi->work_lock);
73 affs_commit_super(sb, 1);
76 void affs_mark_sb_dirty(struct super_block *sb)
78 struct affs_sb_info *sbi = AFFS_SB(sb);
81 if (sb->s_flags & MS_RDONLY)
84 spin_lock(&sbi->work_lock);
85 if (!sbi->work_queued) {
86 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
87 queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
90 spin_unlock(&sbi->work_lock);
93 static struct kmem_cache * affs_inode_cachep;
95 static struct inode *affs_alloc_inode(struct super_block *sb)
97 struct affs_inode_info *i;
99 i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
103 i->vfs_inode.i_version = 1;
108 return &i->vfs_inode;
111 static void affs_i_callback(struct rcu_head *head)
113 struct inode *inode = container_of(head, struct inode, i_rcu);
114 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
117 static void affs_destroy_inode(struct inode *inode)
119 call_rcu(&inode->i_rcu, affs_i_callback);
122 static void init_once(void *foo)
124 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
126 sema_init(&ei->i_link_lock, 1);
127 sema_init(&ei->i_ext_lock, 1);
128 inode_init_once(&ei->vfs_inode);
131 static int init_inodecache(void)
133 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
134 sizeof(struct affs_inode_info),
135 0, (SLAB_RECLAIM_ACCOUNT|
138 if (affs_inode_cachep == NULL)
143 static void destroy_inodecache(void)
146 * Make sure all delayed rcu free inodes are flushed before we
150 kmem_cache_destroy(affs_inode_cachep);
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,
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,
171 static const match_table_t tokens = {
173 {Opt_mode, "mode=%o"},
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"},
191 parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root,
192 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
195 substring_t args[MAX_OPT_ARGS];
197 /* Fill in defaults */
199 *uid = current_uid();
200 *gid = current_gid();
210 while ((p = strsep(&options, ",")) != NULL) {
211 int token, n, option;
215 token = match_token(p, tokens, args);
218 if (match_int(&args[0], &n))
220 if (n != 512 && n != 1024 && n != 2048
222 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
228 if (match_octal(&args[0], &option))
230 *mode = option & 0777;
231 *mount_opts |= SF_SETMODE;
234 *mount_opts |= SF_MUFS;
237 *prefix = match_strdup(&args[0]);
240 *mount_opts |= SF_PREFIX;
243 *mount_opts |= SF_IMMUTABLE;
246 if (match_int(&args[0], reserved))
250 if (match_int(&args[0], root))
254 if (match_int(&args[0], &option))
256 *gid = make_kgid(current_user_ns(), option);
257 if (!gid_valid(*gid))
259 *mount_opts |= SF_SETGID;
262 if (match_int(&args[0], &option))
264 *uid = make_kuid(current_user_ns(), option);
265 if (!uid_valid(*uid))
267 *mount_opts |= SF_SETUID;
270 *mount_opts |= SF_VERBOSE;
273 char *vol = match_strdup(&args[0]);
276 strlcpy(volume, vol, 32);
281 /* Silently ignore the quota options */
284 printk("AFFS: Unrecognized mount option \"%s\" "
285 "or missing value\n", p);
292 /* This function definitely needs to be split up. Some fine day I'll
293 * hopefully have the guts to do so. Until then: sorry for the mess.
296 static int affs_fill_super(struct super_block *sb, void *data, int silent)
298 struct affs_sb_info *sbi;
299 struct buffer_head *root_bh = NULL;
300 struct buffer_head *boot_bh;
301 struct inode *root_inode = NULL;
311 unsigned long mount_flags;
312 int tmp_flags; /* fix remount prototype... */
316 save_mount_options(sb, data);
318 pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
320 sb->s_magic = AFFS_SUPER_MAGIC;
321 sb->s_op = &affs_sops;
322 sb->s_flags |= MS_NODIRATIME;
324 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
330 mutex_init(&sbi->s_bmlock);
331 spin_lock_init(&sbi->symlink_lock);
332 spin_lock_init(&sbi->work_lock);
333 INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
335 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
336 &blocksize,&sbi->s_prefix,
337 sbi->s_volume, &mount_flags)) {
338 printk(KERN_ERR "AFFS: Error parsing options\n");
341 /* N.B. after this point s_prefix must be released */
343 sbi->s_flags = mount_flags;
347 sbi->s_reserved= reserved;
349 /* Get the size of the device in 512-byte blocks.
350 * If we later see that the partition uses bigger
351 * blocks, we will have to change it.
354 size = sb->s_bdev->bd_inode->i_size >> 9;
355 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
357 affs_set_blocksize(sb, PAGE_SIZE);
358 /* Try to find root block. Its location depends on the block size. */
364 size = size / (blocksize / 512);
366 for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
367 sbi->s_root_block = root_block;
369 sbi->s_root_block = (reserved + size - 1) / 2;
370 pr_debug("AFFS: setting blocksize to %d\n", blocksize);
371 affs_set_blocksize(sb, blocksize);
372 sbi->s_partition_size = size;
374 /* The root block location that was calculated above is not
375 * correct if the partition size is an odd number of 512-
376 * byte blocks, which will be rounded down to a number of
377 * 1024-byte blocks, and if there were an even number of
378 * reserved blocks. Ideally, all partition checkers should
379 * report the real number of blocks of the real blocksize,
380 * but since this just cannot be done, we have to try to
381 * find the root block anyways. In the above case, it is one
382 * block behind the calculated one. So we check this one, too.
384 for (num_bm = 0; num_bm < 2; num_bm++) {
385 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
386 "size=%d, reserved=%d\n",
388 sbi->s_root_block + num_bm,
389 blocksize, size, reserved);
390 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
393 if (!affs_checksum_block(sb, root_bh) &&
394 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
395 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
396 sbi->s_hashsize = blocksize / 4 - 56;
397 sbi->s_root_block += num_bm;
401 affs_brelse(root_bh);
406 printk(KERN_ERR "AFFS: No valid root block on device %s\n",
410 /* N.B. after this point bh must be released */
412 /* Keep super block in cache */
413 sbi->s_root_bh = root_bh;
414 root_block = sbi->s_root_block;
416 /* Find out which kind of FS we have */
417 boot_bh = sb_bread(sb, 0);
419 printk(KERN_ERR "AFFS: Cannot read boot block\n");
422 memcpy(sig, boot_bh->b_data, 4);
424 chksum = be32_to_cpu(*(__be32 *)sig);
426 /* Dircache filesystems are compatible with non-dircache ones
427 * when reading. As long as they aren't supported, writing is
430 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
431 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
432 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
434 sb->s_flags |= MS_RDONLY;
440 sbi->s_flags |= SF_MUFS;
444 sbi->s_flags |= SF_INTL;
447 sbi->s_flags |= SF_MUFS;
452 sbi->s_flags |= SF_MUFS;
455 sbi->s_flags |= SF_OFS;
456 sb->s_flags |= MS_NOEXEC;
460 sbi->s_flags |= SF_MUFS;
463 sbi->s_flags |= SF_INTL | SF_OFS;
464 sb->s_flags |= MS_NOEXEC;
467 printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
472 if (mount_flags & SF_VERBOSE) {
473 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
474 printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
476 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
477 sig, sig[3] + '0', blocksize);
480 sb->s_flags |= MS_NODEV | MS_NOSUID;
482 sbi->s_data_blksize = sb->s_blocksize;
483 if (sbi->s_flags & SF_OFS)
484 sbi->s_data_blksize -= 24;
486 tmp_flags = sb->s_flags;
487 ret = affs_init_bitmap(sb, &tmp_flags);
490 sb->s_flags = tmp_flags;
492 /* set up enough so that it can read an inode */
494 root_inode = affs_iget(sb, root_block);
495 if (IS_ERR(root_inode))
496 return PTR_ERR(root_inode);
498 if (AFFS_SB(sb)->s_flags & SF_INTL)
499 sb->s_d_op = &affs_intl_dentry_operations;
501 sb->s_d_op = &affs_dentry_operations;
503 sb->s_root = d_make_root(root_inode);
505 printk(KERN_ERR "AFFS: Get root inode failed\n");
509 pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
514 affs_remount(struct super_block *sb, int *flags, char *data)
516 struct affs_sb_info *sbi = AFFS_SB(sb);
523 unsigned long mount_flags;
525 char *new_opts = kstrdup(data, GFP_KERNEL);
529 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
531 *flags |= MS_NODIRATIME;
533 memcpy(volume, sbi->s_volume, 32);
534 if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
535 &blocksize, &prefix, volume,
542 flush_delayed_work(&sbi->sb_work);
543 replace_mount_options(sb, new_opts);
545 sbi->s_flags = mount_flags;
549 /* protect against readers */
550 spin_lock(&sbi->symlink_lock);
552 kfree(sbi->s_prefix);
553 sbi->s_prefix = prefix;
555 memcpy(sbi->s_volume, volume, 32);
556 spin_unlock(&sbi->symlink_lock);
558 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
561 if (*flags & MS_RDONLY)
562 affs_free_bitmap(sb);
564 res = affs_init_bitmap(sb, flags);
570 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
572 struct super_block *sb = dentry->d_sb;
574 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
576 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
577 AFFS_SB(sb)->s_reserved);
579 free = affs_count_free_blocks(sb);
580 buf->f_type = AFFS_SUPER_MAGIC;
581 buf->f_bsize = sb->s_blocksize;
582 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
584 buf->f_bavail = free;
585 buf->f_fsid.val[0] = (u32)id;
586 buf->f_fsid.val[1] = (u32)(id >> 32);
591 static struct dentry *affs_mount(struct file_system_type *fs_type,
592 int flags, const char *dev_name, void *data)
594 return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
597 static void affs_kill_sb(struct super_block *sb)
599 struct affs_sb_info *sbi = AFFS_SB(sb);
600 kill_block_super(sb);
602 affs_free_bitmap(sb);
603 affs_brelse(sbi->s_root_bh);
604 kfree(sbi->s_prefix);
609 static struct file_system_type affs_fs_type = {
610 .owner = THIS_MODULE,
613 .kill_sb = affs_kill_sb,
614 .fs_flags = FS_REQUIRES_DEV,
616 MODULE_ALIAS_FS("affs");
618 static int __init init_affs_fs(void)
620 int err = init_inodecache();
623 err = register_filesystem(&affs_fs_type);
628 destroy_inodecache();
633 static void __exit exit_affs_fs(void)
635 unregister_filesystem(&affs_fs_type);
636 destroy_inodecache();
639 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
640 MODULE_LICENSE("GPL");
642 module_init(init_affs_fs)
643 module_exit(exit_affs_fs)