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>
22 extern struct timezone sys_tz;
24 static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
25 static int affs_remount (struct super_block *sb, int *flags, char *data);
28 affs_commit_super(struct super_block *sb, int wait)
30 struct affs_sb_info *sbi = AFFS_SB(sb);
31 struct buffer_head *bh = sbi->s_root_bh;
32 struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
35 secs_to_datestamp(get_seconds(), &tail->disk_change);
36 affs_fix_checksum(sb, bh);
39 mark_buffer_dirty(bh);
41 sync_dirty_buffer(bh);
45 affs_put_super(struct super_block *sb)
47 struct affs_sb_info *sbi = AFFS_SB(sb);
48 pr_debug("AFFS: put_super()\n");
52 affs_brelse(sbi->s_root_bh);
58 affs_write_super(struct super_block *sb)
60 if (!(sb->s_flags & MS_RDONLY))
61 affs_commit_super(sb, 1);
63 pr_debug("AFFS: write_super() at %lu, clean=2\n", get_seconds());
67 affs_sync_fs(struct super_block *sb, int wait)
69 affs_commit_super(sb, wait);
74 static struct kmem_cache * affs_inode_cachep;
76 static struct inode *affs_alloc_inode(struct super_block *sb)
78 struct affs_inode_info *i;
80 i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
84 i->vfs_inode.i_version = 1;
92 static void affs_i_callback(struct rcu_head *head)
94 struct inode *inode = container_of(head, struct inode, i_rcu);
95 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
98 static void affs_destroy_inode(struct inode *inode)
100 call_rcu(&inode->i_rcu, affs_i_callback);
103 static void init_once(void *foo)
105 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
107 sema_init(&ei->i_link_lock, 1);
108 sema_init(&ei->i_ext_lock, 1);
109 inode_init_once(&ei->vfs_inode);
112 static int init_inodecache(void)
114 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
115 sizeof(struct affs_inode_info),
116 0, (SLAB_RECLAIM_ACCOUNT|
119 if (affs_inode_cachep == NULL)
124 static void destroy_inodecache(void)
126 kmem_cache_destroy(affs_inode_cachep);
129 static const struct super_operations affs_sops = {
130 .alloc_inode = affs_alloc_inode,
131 .destroy_inode = affs_destroy_inode,
132 .write_inode = affs_write_inode,
133 .evict_inode = affs_evict_inode,
134 .put_super = affs_put_super,
135 .write_super = affs_write_super,
136 .sync_fs = affs_sync_fs,
137 .statfs = affs_statfs,
138 .remount_fs = affs_remount,
139 .show_options = generic_show_options,
143 Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
144 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
145 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
148 static const match_table_t tokens = {
150 {Opt_mode, "mode=%o"},
152 {Opt_prefix, "prefix=%s"},
153 {Opt_protect, "protect"},
154 {Opt_reserved, "reserved=%u"},
155 {Opt_root, "root=%u"},
156 {Opt_setgid, "setgid=%u"},
157 {Opt_setuid, "setuid=%u"},
158 {Opt_verbose, "verbose"},
159 {Opt_volume, "volume=%s"},
160 {Opt_ignore, "grpquota"},
161 {Opt_ignore, "noquota"},
162 {Opt_ignore, "quota"},
163 {Opt_ignore, "usrquota"},
168 parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
169 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
172 substring_t args[MAX_OPT_ARGS];
174 /* Fill in defaults */
176 *uid = current_uid();
177 *gid = current_gid();
187 while ((p = strsep(&options, ",")) != NULL) {
188 int token, n, option;
192 token = match_token(p, tokens, args);
195 if (match_int(&args[0], &n))
197 if (n != 512 && n != 1024 && n != 2048
199 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
205 if (match_octal(&args[0], &option))
207 *mode = option & 0777;
208 *mount_opts |= SF_SETMODE;
211 *mount_opts |= SF_MUFS;
214 *prefix = match_strdup(&args[0]);
217 *mount_opts |= SF_PREFIX;
220 *mount_opts |= SF_IMMUTABLE;
223 if (match_int(&args[0], reserved))
227 if (match_int(&args[0], root))
231 if (match_int(&args[0], &option))
234 *mount_opts |= SF_SETGID;
237 if (match_int(&args[0], &option))
240 *mount_opts |= SF_SETUID;
243 *mount_opts |= SF_VERBOSE;
246 char *vol = match_strdup(&args[0]);
249 strlcpy(volume, vol, 32);
254 /* Silently ignore the quota options */
257 printk("AFFS: Unrecognized mount option \"%s\" "
258 "or missing value\n", p);
265 /* This function definitely needs to be split up. Some fine day I'll
266 * hopefully have the guts to do so. Until then: sorry for the mess.
269 static int affs_fill_super(struct super_block *sb, void *data, int silent)
271 struct affs_sb_info *sbi;
272 struct buffer_head *root_bh = NULL;
273 struct buffer_head *boot_bh;
274 struct inode *root_inode = NULL;
284 unsigned long mount_flags;
285 int tmp_flags; /* fix remount prototype... */
289 save_mount_options(sb, data);
291 pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
293 sb->s_magic = AFFS_SUPER_MAGIC;
294 sb->s_op = &affs_sops;
295 sb->s_flags |= MS_NODIRATIME;
297 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
303 mutex_init(&sbi->s_bmlock);
304 spin_lock_init(&sbi->symlink_lock);
306 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
307 &blocksize,&sbi->s_prefix,
308 sbi->s_volume, &mount_flags)) {
309 printk(KERN_ERR "AFFS: Error parsing options\n");
310 kfree(sbi->s_prefix);
314 /* N.B. after this point s_prefix must be released */
316 sbi->s_flags = mount_flags;
320 sbi->s_reserved= reserved;
322 /* Get the size of the device in 512-byte blocks.
323 * If we later see that the partition uses bigger
324 * blocks, we will have to change it.
327 size = sb->s_bdev->bd_inode->i_size >> 9;
328 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
330 affs_set_blocksize(sb, PAGE_SIZE);
331 /* Try to find root block. Its location depends on the block size. */
337 size = size / (blocksize / 512);
339 for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
340 sbi->s_root_block = root_block;
342 sbi->s_root_block = (reserved + size - 1) / 2;
343 pr_debug("AFFS: setting blocksize to %d\n", blocksize);
344 affs_set_blocksize(sb, blocksize);
345 sbi->s_partition_size = size;
347 /* The root block location that was calculated above is not
348 * correct if the partition size is an odd number of 512-
349 * byte blocks, which will be rounded down to a number of
350 * 1024-byte blocks, and if there were an even number of
351 * reserved blocks. Ideally, all partition checkers should
352 * report the real number of blocks of the real blocksize,
353 * but since this just cannot be done, we have to try to
354 * find the root block anyways. In the above case, it is one
355 * block behind the calculated one. So we check this one, too.
357 for (num_bm = 0; num_bm < 2; num_bm++) {
358 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
359 "size=%d, reserved=%d\n",
361 sbi->s_root_block + num_bm,
362 blocksize, size, reserved);
363 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
366 if (!affs_checksum_block(sb, root_bh) &&
367 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
368 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
369 sbi->s_hashsize = blocksize / 4 - 56;
370 sbi->s_root_block += num_bm;
374 affs_brelse(root_bh);
379 printk(KERN_ERR "AFFS: No valid root block on device %s\n",
383 /* N.B. after this point bh must be released */
385 root_block = sbi->s_root_block;
387 /* Find out which kind of FS we have */
388 boot_bh = sb_bread(sb, 0);
390 printk(KERN_ERR "AFFS: Cannot read boot block\n");
393 memcpy(sig, boot_bh->b_data, 4);
395 chksum = be32_to_cpu(*(__be32 *)sig);
397 /* Dircache filesystems are compatible with non-dircache ones
398 * when reading. As long as they aren't supported, writing is
401 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
402 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
403 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
405 sb->s_flags |= MS_RDONLY;
411 sbi->s_flags |= SF_MUFS;
415 sbi->s_flags |= SF_INTL;
418 sbi->s_flags |= SF_MUFS;
423 sbi->s_flags |= SF_MUFS;
426 sbi->s_flags |= SF_OFS;
427 sb->s_flags |= MS_NOEXEC;
431 sbi->s_flags |= SF_MUFS;
434 sbi->s_flags |= SF_INTL | SF_OFS;
435 sb->s_flags |= MS_NOEXEC;
438 printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
443 if (mount_flags & SF_VERBOSE) {
444 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
445 printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
447 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
448 sig, sig[3] + '0', blocksize);
451 sb->s_flags |= MS_NODEV | MS_NOSUID;
453 sbi->s_data_blksize = sb->s_blocksize;
454 if (sbi->s_flags & SF_OFS)
455 sbi->s_data_blksize -= 24;
457 /* Keep super block in cache */
458 sbi->s_root_bh = root_bh;
459 /* N.B. after this point s_root_bh must be released */
461 tmp_flags = sb->s_flags;
462 if (affs_init_bitmap(sb, &tmp_flags))
464 sb->s_flags = tmp_flags;
466 /* set up enough so that it can read an inode */
468 root_inode = affs_iget(sb, root_block);
469 if (IS_ERR(root_inode)) {
470 ret = PTR_ERR(root_inode);
474 if (AFFS_SB(sb)->s_flags & SF_INTL)
475 sb->s_d_op = &affs_intl_dentry_operations;
477 sb->s_d_op = &affs_dentry_operations;
479 sb->s_root = d_make_root(root_inode);
481 printk(KERN_ERR "AFFS: Get root inode failed\n");
485 pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
489 * Begin the cascaded cleanup ...
492 kfree(sbi->s_bitmap);
493 affs_brelse(root_bh);
494 kfree(sbi->s_prefix);
496 sb->s_fs_info = NULL;
501 affs_remount(struct super_block *sb, int *flags, char *data)
503 struct affs_sb_info *sbi = AFFS_SB(sb);
510 unsigned long mount_flags;
512 char *new_opts = kstrdup(data, GFP_KERNEL);
516 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
518 *flags |= MS_NODIRATIME;
520 memcpy(volume, sbi->s_volume, 32);
521 if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
522 &blocksize, &prefix, volume,
529 replace_mount_options(sb, new_opts);
531 sbi->s_flags = mount_flags;
535 /* protect against readers */
536 spin_lock(&sbi->symlink_lock);
538 kfree(sbi->s_prefix);
539 sbi->s_prefix = prefix;
541 memcpy(sbi->s_volume, volume, 32);
542 spin_unlock(&sbi->symlink_lock);
544 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
547 if (*flags & MS_RDONLY)
548 affs_free_bitmap(sb);
550 res = affs_init_bitmap(sb, flags);
556 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
558 struct super_block *sb = dentry->d_sb;
560 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
562 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
563 AFFS_SB(sb)->s_reserved);
565 free = affs_count_free_blocks(sb);
566 buf->f_type = AFFS_SUPER_MAGIC;
567 buf->f_bsize = sb->s_blocksize;
568 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
570 buf->f_bavail = free;
571 buf->f_fsid.val[0] = (u32)id;
572 buf->f_fsid.val[1] = (u32)(id >> 32);
577 static struct dentry *affs_mount(struct file_system_type *fs_type,
578 int flags, const char *dev_name, void *data)
580 return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
583 static struct file_system_type affs_fs_type = {
584 .owner = THIS_MODULE,
587 .kill_sb = kill_block_super,
588 .fs_flags = FS_REQUIRES_DEV,
591 static int __init init_affs_fs(void)
593 int err = init_inodecache();
596 err = register_filesystem(&affs_fs_type);
601 destroy_inodecache();
606 static void __exit exit_affs_fs(void)
608 unregister_filesystem(&affs_fs_type);
609 destroy_inodecache();
612 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
613 MODULE_LICENSE("GPL");
615 module_init(init_affs_fs)
616 module_exit(exit_affs_fs)