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/smp_lock.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_put_super(struct super_block *sb)
30 struct affs_sb_info *sbi = AFFS_SB(sb);
31 pr_debug("AFFS: put_super()\n");
35 if (!(sb->s_flags & MS_RDONLY)) {
36 AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(1);
37 secs_to_datestamp(get_seconds(),
38 &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
39 affs_fix_checksum(sb, sbi->s_root_bh);
40 mark_buffer_dirty(sbi->s_root_bh);
45 affs_brelse(sbi->s_root_bh);
53 affs_write_super(struct super_block *sb)
56 struct affs_sb_info *sbi = AFFS_SB(sb);
59 if (!(sb->s_flags & MS_RDONLY)) {
60 // if (sbi->s_bitmap[i].bm_bh) {
61 // if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) {
63 AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(clean);
64 secs_to_datestamp(get_seconds(),
65 &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
66 affs_fix_checksum(sb, sbi->s_root_bh);
67 mark_buffer_dirty(sbi->s_root_bh);
68 sb->s_dirt = !clean; /* redo until bitmap synced */
73 pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean);
76 static struct kmem_cache * affs_inode_cachep;
78 static struct inode *affs_alloc_inode(struct super_block *sb)
80 struct affs_inode_info *i;
82 i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
86 i->vfs_inode.i_version = 1;
94 static void affs_destroy_inode(struct inode *inode)
96 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
99 static void init_once(void *foo)
101 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
103 init_MUTEX(&ei->i_link_lock);
104 init_MUTEX(&ei->i_ext_lock);
105 inode_init_once(&ei->vfs_inode);
108 static int init_inodecache(void)
110 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
111 sizeof(struct affs_inode_info),
112 0, (SLAB_RECLAIM_ACCOUNT|
115 if (affs_inode_cachep == NULL)
120 static void destroy_inodecache(void)
122 kmem_cache_destroy(affs_inode_cachep);
125 static const struct super_operations affs_sops = {
126 .alloc_inode = affs_alloc_inode,
127 .destroy_inode = affs_destroy_inode,
128 .write_inode = affs_write_inode,
129 .delete_inode = affs_delete_inode,
130 .clear_inode = affs_clear_inode,
131 .put_super = affs_put_super,
132 .write_super = affs_write_super,
133 .statfs = affs_statfs,
134 .remount_fs = affs_remount,
135 .show_options = generic_show_options,
139 Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
140 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
141 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
144 static const match_table_t tokens = {
146 {Opt_mode, "mode=%o"},
148 {Opt_prefix, "prefix=%s"},
149 {Opt_protect, "protect"},
150 {Opt_reserved, "reserved=%u"},
151 {Opt_root, "root=%u"},
152 {Opt_setgid, "setgid=%u"},
153 {Opt_setuid, "setuid=%u"},
154 {Opt_verbose, "verbose"},
155 {Opt_volume, "volume=%s"},
156 {Opt_ignore, "grpquota"},
157 {Opt_ignore, "noquota"},
158 {Opt_ignore, "quota"},
159 {Opt_ignore, "usrquota"},
164 parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
165 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
168 substring_t args[MAX_OPT_ARGS];
170 /* Fill in defaults */
172 *uid = current_uid();
173 *gid = current_gid();
183 while ((p = strsep(&options, ",")) != NULL) {
184 int token, n, option;
188 token = match_token(p, tokens, args);
191 if (match_int(&args[0], &n))
193 if (n != 512 && n != 1024 && n != 2048
195 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
201 if (match_octal(&args[0], &option))
203 *mode = option & 0777;
204 *mount_opts |= SF_SETMODE;
207 *mount_opts |= SF_MUFS;
210 /* Free any previous prefix */
212 *prefix = match_strdup(&args[0]);
215 *mount_opts |= SF_PREFIX;
218 *mount_opts |= SF_IMMUTABLE;
221 if (match_int(&args[0], reserved))
225 if (match_int(&args[0], root))
229 if (match_int(&args[0], &option))
232 *mount_opts |= SF_SETGID;
235 if (match_int(&args[0], &option))
238 *mount_opts |= SF_SETUID;
241 *mount_opts |= SF_VERBOSE;
244 char *vol = match_strdup(&args[0]);
247 strlcpy(volume, vol, 32);
252 /* Silently ignore the quota options */
255 printk("AFFS: Unrecognized mount option \"%s\" "
256 "or missing value\n", p);
263 /* This function definitely needs to be split up. Some fine day I'll
264 * hopefully have the guts to do so. Until then: sorry for the mess.
267 static int affs_fill_super(struct super_block *sb, void *data, int silent)
269 struct affs_sb_info *sbi;
270 struct buffer_head *root_bh = NULL;
271 struct buffer_head *boot_bh;
272 struct inode *root_inode = NULL;
282 unsigned long mount_flags;
283 int tmp_flags; /* fix remount prototype... */
287 save_mount_options(sb, data);
289 pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
291 sb->s_magic = AFFS_SUPER_MAGIC;
292 sb->s_op = &affs_sops;
293 sb->s_flags |= MS_NODIRATIME;
295 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
299 mutex_init(&sbi->s_bmlock);
301 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
302 &blocksize,&sbi->s_prefix,
303 sbi->s_volume, &mount_flags)) {
304 printk(KERN_ERR "AFFS: Error parsing options\n");
307 /* N.B. after this point s_prefix must be released */
309 sbi->s_flags = mount_flags;
313 sbi->s_reserved= reserved;
315 /* Get the size of the device in 512-byte blocks.
316 * If we later see that the partition uses bigger
317 * blocks, we will have to change it.
320 size = sb->s_bdev->bd_inode->i_size >> 9;
321 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
323 affs_set_blocksize(sb, PAGE_SIZE);
324 /* Try to find root block. Its location depends on the block size. */
330 size = size / (blocksize / 512);
332 for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
333 sbi->s_root_block = root_block;
335 sbi->s_root_block = (reserved + size - 1) / 2;
336 pr_debug("AFFS: setting blocksize to %d\n", blocksize);
337 affs_set_blocksize(sb, blocksize);
338 sbi->s_partition_size = size;
340 /* The root block location that was calculated above is not
341 * correct if the partition size is an odd number of 512-
342 * byte blocks, which will be rounded down to a number of
343 * 1024-byte blocks, and if there were an even number of
344 * reserved blocks. Ideally, all partition checkers should
345 * report the real number of blocks of the real blocksize,
346 * but since this just cannot be done, we have to try to
347 * find the root block anyways. In the above case, it is one
348 * block behind the calculated one. So we check this one, too.
350 for (num_bm = 0; num_bm < 2; num_bm++) {
351 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
352 "size=%d, reserved=%d\n",
354 sbi->s_root_block + num_bm,
355 blocksize, size, reserved);
356 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
359 if (!affs_checksum_block(sb, root_bh) &&
360 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
361 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
362 sbi->s_hashsize = blocksize / 4 - 56;
363 sbi->s_root_block += num_bm;
367 affs_brelse(root_bh);
372 printk(KERN_ERR "AFFS: No valid root block on device %s\n",
376 /* N.B. after this point bh must be released */
378 root_block = sbi->s_root_block;
380 /* Find out which kind of FS we have */
381 boot_bh = sb_bread(sb, 0);
383 printk(KERN_ERR "AFFS: Cannot read boot block\n");
386 memcpy(sig, boot_bh->b_data, 4);
388 chksum = be32_to_cpu(*(__be32 *)sig);
390 /* Dircache filesystems are compatible with non-dircache ones
391 * when reading. As long as they aren't supported, writing is
394 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
395 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
396 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
398 sb->s_flags |= MS_RDONLY;
404 sbi->s_flags |= SF_MUFS;
408 sbi->s_flags |= SF_INTL;
411 sbi->s_flags |= SF_MUFS;
416 sbi->s_flags |= SF_MUFS;
419 sbi->s_flags |= SF_OFS;
420 sb->s_flags |= MS_NOEXEC;
424 sbi->s_flags |= SF_MUFS;
427 sbi->s_flags |= SF_INTL | SF_OFS;
428 sb->s_flags |= MS_NOEXEC;
431 printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
436 if (mount_flags & SF_VERBOSE) {
437 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
438 printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
440 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
441 sig, sig[3] + '0', blocksize);
444 sb->s_flags |= MS_NODEV | MS_NOSUID;
446 sbi->s_data_blksize = sb->s_blocksize;
447 if (sbi->s_flags & SF_OFS)
448 sbi->s_data_blksize -= 24;
450 /* Keep super block in cache */
451 sbi->s_root_bh = root_bh;
452 /* N.B. after this point s_root_bh must be released */
454 tmp_flags = sb->s_flags;
455 if (affs_init_bitmap(sb, &tmp_flags))
457 sb->s_flags = tmp_flags;
459 /* set up enough so that it can read an inode */
461 root_inode = affs_iget(sb, root_block);
462 if (IS_ERR(root_inode)) {
463 ret = PTR_ERR(root_inode);
464 goto out_error_noinode;
467 sb->s_root = d_alloc_root(root_inode);
469 printk(KERN_ERR "AFFS: Get root inode failed\n");
472 sb->s_root->d_op = &affs_dentry_operations;
474 pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
478 * Begin the cascaded cleanup ...
484 kfree(sbi->s_bitmap);
485 affs_brelse(root_bh);
486 kfree(sbi->s_prefix);
488 sb->s_fs_info = NULL;
493 affs_remount(struct super_block *sb, int *flags, char *data)
495 struct affs_sb_info *sbi = AFFS_SB(sb);
502 unsigned long mount_flags;
504 char *new_opts = kstrdup(data, GFP_KERNEL);
506 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
508 *flags |= MS_NODIRATIME;
510 if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
511 &blocksize, &sbi->s_prefix, sbi->s_volume,
517 replace_mount_options(sb, new_opts);
519 sbi->s_flags = mount_flags;
524 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
528 if (*flags & MS_RDONLY) {
531 affs_write_super(sb);
532 affs_free_bitmap(sb);
534 res = affs_init_bitmap(sb, flags);
541 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
543 struct super_block *sb = dentry->d_sb;
545 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
547 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
548 AFFS_SB(sb)->s_reserved);
550 free = affs_count_free_blocks(sb);
551 buf->f_type = AFFS_SUPER_MAGIC;
552 buf->f_bsize = sb->s_blocksize;
553 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
555 buf->f_bavail = free;
556 buf->f_fsid.val[0] = (u32)id;
557 buf->f_fsid.val[1] = (u32)(id >> 32);
562 static int affs_get_sb(struct file_system_type *fs_type,
563 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
565 return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super,
569 static struct file_system_type affs_fs_type = {
570 .owner = THIS_MODULE,
572 .get_sb = affs_get_sb,
573 .kill_sb = kill_block_super,
574 .fs_flags = FS_REQUIRES_DEV,
577 static int __init init_affs_fs(void)
579 int err = init_inodecache();
582 err = register_filesystem(&affs_fs_type);
587 destroy_inodecache();
592 static void __exit exit_affs_fs(void)
594 unregister_filesystem(&affs_fs_type);
595 destroy_inodecache();
598 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
599 MODULE_LICENSE("GPL");
601 module_init(init_affs_fs)
602 module_exit(exit_affs_fs)