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>
21 extern struct timezone sys_tz;
23 static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
24 static int affs_remount (struct super_block *sb, int *flags, char *data);
27 affs_put_super(struct super_block *sb)
29 struct affs_sb_info *sbi = AFFS_SB(sb);
30 pr_debug("AFFS: put_super()\n");
34 if (!(sb->s_flags & MS_RDONLY)) {
35 AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(1);
36 secs_to_datestamp(get_seconds(),
37 &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
38 affs_fix_checksum(sb, sbi->s_root_bh);
39 mark_buffer_dirty(sbi->s_root_bh);
44 affs_brelse(sbi->s_root_bh);
52 affs_write_super(struct super_block *sb)
55 struct affs_sb_info *sbi = AFFS_SB(sb);
58 if (!(sb->s_flags & MS_RDONLY)) {
59 // if (sbi->s_bitmap[i].bm_bh) {
60 // if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) {
62 AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(clean);
63 secs_to_datestamp(get_seconds(),
64 &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
65 affs_fix_checksum(sb, sbi->s_root_bh);
66 mark_buffer_dirty(sbi->s_root_bh);
67 sb->s_dirt = !clean; /* redo until bitmap synced */
72 pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean);
75 static struct kmem_cache * affs_inode_cachep;
77 static struct inode *affs_alloc_inode(struct super_block *sb)
79 struct affs_inode_info *i;
81 i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
85 i->vfs_inode.i_version = 1;
93 static void affs_destroy_inode(struct inode *inode)
95 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
98 static void init_once(void *foo)
100 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
102 init_MUTEX(&ei->i_link_lock);
103 init_MUTEX(&ei->i_ext_lock);
104 inode_init_once(&ei->vfs_inode);
107 static int init_inodecache(void)
109 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
110 sizeof(struct affs_inode_info),
111 0, (SLAB_RECLAIM_ACCOUNT|
114 if (affs_inode_cachep == NULL)
119 static void destroy_inodecache(void)
121 kmem_cache_destroy(affs_inode_cachep);
124 static const struct super_operations affs_sops = {
125 .alloc_inode = affs_alloc_inode,
126 .destroy_inode = affs_destroy_inode,
127 .write_inode = affs_write_inode,
128 .delete_inode = affs_delete_inode,
129 .clear_inode = affs_clear_inode,
130 .put_super = affs_put_super,
131 .write_super = affs_write_super,
132 .statfs = affs_statfs,
133 .remount_fs = affs_remount,
134 .show_options = generic_show_options,
138 Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
139 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
140 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
143 static const match_table_t tokens = {
145 {Opt_mode, "mode=%o"},
147 {Opt_prefix, "prefix=%s"},
148 {Opt_protect, "protect"},
149 {Opt_reserved, "reserved=%u"},
150 {Opt_root, "root=%u"},
151 {Opt_setgid, "setgid=%u"},
152 {Opt_setuid, "setuid=%u"},
153 {Opt_verbose, "verbose"},
154 {Opt_volume, "volume=%s"},
155 {Opt_ignore, "grpquota"},
156 {Opt_ignore, "noquota"},
157 {Opt_ignore, "quota"},
158 {Opt_ignore, "usrquota"},
163 parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
164 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
167 substring_t args[MAX_OPT_ARGS];
169 /* Fill in defaults */
171 *uid = current_uid();
172 *gid = current_gid();
182 while ((p = strsep(&options, ",")) != NULL) {
183 int token, n, option;
187 token = match_token(p, tokens, args);
190 if (match_int(&args[0], &n))
192 if (n != 512 && n != 1024 && n != 2048
194 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
200 if (match_octal(&args[0], &option))
202 *mode = option & 0777;
203 *mount_opts |= SF_SETMODE;
206 *mount_opts |= SF_MUFS;
209 /* Free any previous prefix */
211 *prefix = match_strdup(&args[0]);
214 *mount_opts |= SF_PREFIX;
217 *mount_opts |= SF_IMMUTABLE;
220 if (match_int(&args[0], reserved))
224 if (match_int(&args[0], root))
228 if (match_int(&args[0], &option))
231 *mount_opts |= SF_SETGID;
234 if (match_int(&args[0], &option))
237 *mount_opts |= SF_SETUID;
240 *mount_opts |= SF_VERBOSE;
243 char *vol = match_strdup(&args[0]);
246 strlcpy(volume, vol, 32);
251 /* Silently ignore the quota options */
254 printk("AFFS: Unrecognized mount option \"%s\" "
255 "or missing value\n", p);
262 /* This function definitely needs to be split up. Some fine day I'll
263 * hopefully have the guts to do so. Until then: sorry for the mess.
266 static int affs_fill_super(struct super_block *sb, void *data, int silent)
268 struct affs_sb_info *sbi;
269 struct buffer_head *root_bh = NULL;
270 struct buffer_head *boot_bh;
271 struct inode *root_inode = NULL;
281 unsigned long mount_flags;
282 int tmp_flags; /* fix remount prototype... */
286 save_mount_options(sb, data);
288 pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
290 sb->s_magic = AFFS_SUPER_MAGIC;
291 sb->s_op = &affs_sops;
292 sb->s_flags |= MS_NODIRATIME;
294 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
298 mutex_init(&sbi->s_bmlock);
300 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
301 &blocksize,&sbi->s_prefix,
302 sbi->s_volume, &mount_flags)) {
303 printk(KERN_ERR "AFFS: Error parsing options\n");
306 /* N.B. after this point s_prefix must be released */
308 sbi->s_flags = mount_flags;
312 sbi->s_reserved= reserved;
314 /* Get the size of the device in 512-byte blocks.
315 * If we later see that the partition uses bigger
316 * blocks, we will have to change it.
319 size = sb->s_bdev->bd_inode->i_size >> 9;
320 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
322 affs_set_blocksize(sb, PAGE_SIZE);
323 /* Try to find root block. Its location depends on the block size. */
329 size = size / (blocksize / 512);
331 for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
332 sbi->s_root_block = root_block;
334 sbi->s_root_block = (reserved + size - 1) / 2;
335 pr_debug("AFFS: setting blocksize to %d\n", blocksize);
336 affs_set_blocksize(sb, blocksize);
337 sbi->s_partition_size = size;
339 /* The root block location that was calculated above is not
340 * correct if the partition size is an odd number of 512-
341 * byte blocks, which will be rounded down to a number of
342 * 1024-byte blocks, and if there were an even number of
343 * reserved blocks. Ideally, all partition checkers should
344 * report the real number of blocks of the real blocksize,
345 * but since this just cannot be done, we have to try to
346 * find the root block anyways. In the above case, it is one
347 * block behind the calculated one. So we check this one, too.
349 for (num_bm = 0; num_bm < 2; num_bm++) {
350 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
351 "size=%d, reserved=%d\n",
353 sbi->s_root_block + num_bm,
354 blocksize, size, reserved);
355 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
358 if (!affs_checksum_block(sb, root_bh) &&
359 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
360 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
361 sbi->s_hashsize = blocksize / 4 - 56;
362 sbi->s_root_block += num_bm;
366 affs_brelse(root_bh);
371 printk(KERN_ERR "AFFS: No valid root block on device %s\n",
375 /* N.B. after this point bh must be released */
377 root_block = sbi->s_root_block;
379 /* Find out which kind of FS we have */
380 boot_bh = sb_bread(sb, 0);
382 printk(KERN_ERR "AFFS: Cannot read boot block\n");
385 memcpy(sig, boot_bh->b_data, 4);
387 chksum = be32_to_cpu(*(__be32 *)sig);
389 /* Dircache filesystems are compatible with non-dircache ones
390 * when reading. As long as they aren't supported, writing is
393 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
394 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
395 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
397 sb->s_flags |= MS_RDONLY;
403 sbi->s_flags |= SF_MUFS;
407 sbi->s_flags |= SF_INTL;
410 sbi->s_flags |= SF_MUFS;
415 sbi->s_flags |= SF_MUFS;
418 sbi->s_flags |= SF_OFS;
419 sb->s_flags |= MS_NOEXEC;
423 sbi->s_flags |= SF_MUFS;
426 sbi->s_flags |= SF_INTL | SF_OFS;
427 sb->s_flags |= MS_NOEXEC;
430 printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
435 if (mount_flags & SF_VERBOSE) {
436 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
437 printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
439 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
440 sig, sig[3] + '0', blocksize);
443 sb->s_flags |= MS_NODEV | MS_NOSUID;
445 sbi->s_data_blksize = sb->s_blocksize;
446 if (sbi->s_flags & SF_OFS)
447 sbi->s_data_blksize -= 24;
449 /* Keep super block in cache */
450 sbi->s_root_bh = root_bh;
451 /* N.B. after this point s_root_bh must be released */
453 tmp_flags = sb->s_flags;
454 if (affs_init_bitmap(sb, &tmp_flags))
456 sb->s_flags = tmp_flags;
458 /* set up enough so that it can read an inode */
460 root_inode = affs_iget(sb, root_block);
461 if (IS_ERR(root_inode)) {
462 ret = PTR_ERR(root_inode);
463 goto out_error_noinode;
466 sb->s_root = d_alloc_root(root_inode);
468 printk(KERN_ERR "AFFS: Get root inode failed\n");
471 sb->s_root->d_op = &affs_dentry_operations;
473 pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
477 * Begin the cascaded cleanup ...
483 kfree(sbi->s_bitmap);
484 affs_brelse(root_bh);
485 kfree(sbi->s_prefix);
487 sb->s_fs_info = NULL;
492 affs_remount(struct super_block *sb, int *flags, char *data)
494 struct affs_sb_info *sbi = AFFS_SB(sb);
501 unsigned long mount_flags;
503 char *new_opts = kstrdup(data, GFP_KERNEL);
505 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
507 *flags |= MS_NODIRATIME;
509 if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
510 &blocksize, &sbi->s_prefix, sbi->s_volume,
515 replace_mount_options(sb, new_opts);
517 sbi->s_flags = mount_flags;
522 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
524 if (*flags & MS_RDONLY) {
527 affs_write_super(sb);
528 affs_free_bitmap(sb);
530 res = affs_init_bitmap(sb, flags);
536 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
538 struct super_block *sb = dentry->d_sb;
540 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
542 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
543 AFFS_SB(sb)->s_reserved);
545 free = affs_count_free_blocks(sb);
546 buf->f_type = AFFS_SUPER_MAGIC;
547 buf->f_bsize = sb->s_blocksize;
548 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
550 buf->f_bavail = free;
551 buf->f_fsid.val[0] = (u32)id;
552 buf->f_fsid.val[1] = (u32)(id >> 32);
557 static int affs_get_sb(struct file_system_type *fs_type,
558 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
560 return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super,
564 static struct file_system_type affs_fs_type = {
565 .owner = THIS_MODULE,
567 .get_sb = affs_get_sb,
568 .kill_sb = kill_block_super,
569 .fs_flags = FS_REQUIRES_DEV,
572 static int __init init_affs_fs(void)
574 int err = init_inodecache();
577 err = register_filesystem(&affs_fs_type);
582 destroy_inodecache();
587 static void __exit exit_affs_fs(void)
589 unregister_filesystem(&affs_fs_type);
590 destroy_inodecache();
593 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
594 MODULE_LICENSE("GPL");
596 module_init(init_affs_fs)
597 module_exit(exit_affs_fs)