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>
20 #include <linux/slab.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 clean)
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);
35 tail->bm_flag = cpu_to_be32(clean);
36 secs_to_datestamp(get_seconds(), &tail->disk_change);
37 affs_fix_checksum(sb, bh);
38 mark_buffer_dirty(bh);
42 affs_put_super(struct super_block *sb)
44 struct affs_sb_info *sbi = AFFS_SB(sb);
45 pr_debug("AFFS: put_super()\n");
49 if (!(sb->s_flags & MS_RDONLY))
50 affs_commit_super(sb, 1);
54 affs_brelse(sbi->s_root_bh);
62 affs_write_super(struct super_block *sb)
65 if (!(sb->s_flags & MS_RDONLY))
66 affs_commit_super(sb, 2);
70 pr_debug("AFFS: write_super() at %lu, clean=2\n", get_seconds());
74 affs_sync_fs(struct super_block *sb, int wait)
77 affs_commit_super(sb, 2);
83 static struct kmem_cache * affs_inode_cachep;
85 static struct inode *affs_alloc_inode(struct super_block *sb)
87 struct affs_inode_info *i;
89 i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
93 i->vfs_inode.i_version = 1;
101 static void affs_destroy_inode(struct inode *inode)
103 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
106 static void init_once(void *foo)
108 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
110 init_MUTEX(&ei->i_link_lock);
111 init_MUTEX(&ei->i_ext_lock);
112 inode_init_once(&ei->vfs_inode);
115 static int init_inodecache(void)
117 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
118 sizeof(struct affs_inode_info),
119 0, (SLAB_RECLAIM_ACCOUNT|
122 if (affs_inode_cachep == NULL)
127 static void destroy_inodecache(void)
129 kmem_cache_destroy(affs_inode_cachep);
132 static const struct super_operations affs_sops = {
133 .alloc_inode = affs_alloc_inode,
134 .destroy_inode = affs_destroy_inode,
135 .write_inode = affs_write_inode,
136 .evict_inode = affs_evict_inode,
137 .put_super = affs_put_super,
138 .write_super = affs_write_super,
139 .sync_fs = affs_sync_fs,
140 .statfs = affs_statfs,
141 .remount_fs = affs_remount,
142 .show_options = generic_show_options,
146 Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
147 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
148 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
151 static const match_table_t tokens = {
153 {Opt_mode, "mode=%o"},
155 {Opt_prefix, "prefix=%s"},
156 {Opt_protect, "protect"},
157 {Opt_reserved, "reserved=%u"},
158 {Opt_root, "root=%u"},
159 {Opt_setgid, "setgid=%u"},
160 {Opt_setuid, "setuid=%u"},
161 {Opt_verbose, "verbose"},
162 {Opt_volume, "volume=%s"},
163 {Opt_ignore, "grpquota"},
164 {Opt_ignore, "noquota"},
165 {Opt_ignore, "quota"},
166 {Opt_ignore, "usrquota"},
171 parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
172 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
175 substring_t args[MAX_OPT_ARGS];
177 /* Fill in defaults */
179 *uid = current_uid();
180 *gid = current_gid();
190 while ((p = strsep(&options, ",")) != NULL) {
191 int token, n, option;
195 token = match_token(p, tokens, args);
198 if (match_int(&args[0], &n))
200 if (n != 512 && n != 1024 && n != 2048
202 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
208 if (match_octal(&args[0], &option))
210 *mode = option & 0777;
211 *mount_opts |= SF_SETMODE;
214 *mount_opts |= SF_MUFS;
217 *prefix = match_strdup(&args[0]);
220 *mount_opts |= SF_PREFIX;
223 *mount_opts |= SF_IMMUTABLE;
226 if (match_int(&args[0], reserved))
230 if (match_int(&args[0], root))
234 if (match_int(&args[0], &option))
237 *mount_opts |= SF_SETGID;
240 if (match_int(&args[0], &option))
243 *mount_opts |= SF_SETUID;
246 *mount_opts |= SF_VERBOSE;
249 char *vol = match_strdup(&args[0]);
252 strlcpy(volume, vol, 32);
257 /* Silently ignore the quota options */
260 printk("AFFS: Unrecognized mount option \"%s\" "
261 "or missing value\n", p);
268 /* This function definitely needs to be split up. Some fine day I'll
269 * hopefully have the guts to do so. Until then: sorry for the mess.
272 static int affs_fill_super(struct super_block *sb, void *data, int silent)
274 struct affs_sb_info *sbi;
275 struct buffer_head *root_bh = NULL;
276 struct buffer_head *boot_bh;
277 struct inode *root_inode = NULL;
287 unsigned long mount_flags;
288 int tmp_flags; /* fix remount prototype... */
292 save_mount_options(sb, data);
294 pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
296 sb->s_magic = AFFS_SUPER_MAGIC;
297 sb->s_op = &affs_sops;
298 sb->s_flags |= MS_NODIRATIME;
300 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
304 mutex_init(&sbi->s_bmlock);
305 spin_lock_init(&sbi->symlink_lock);
307 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
308 &blocksize,&sbi->s_prefix,
309 sbi->s_volume, &mount_flags)) {
310 printk(KERN_ERR "AFFS: Error parsing options\n");
311 kfree(sbi->s_prefix);
315 /* N.B. after this point s_prefix must be released */
317 sbi->s_flags = mount_flags;
321 sbi->s_reserved= reserved;
323 /* Get the size of the device in 512-byte blocks.
324 * If we later see that the partition uses bigger
325 * blocks, we will have to change it.
328 size = sb->s_bdev->bd_inode->i_size >> 9;
329 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
331 affs_set_blocksize(sb, PAGE_SIZE);
332 /* Try to find root block. Its location depends on the block size. */
338 size = size / (blocksize / 512);
340 for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
341 sbi->s_root_block = root_block;
343 sbi->s_root_block = (reserved + size - 1) / 2;
344 pr_debug("AFFS: setting blocksize to %d\n", blocksize);
345 affs_set_blocksize(sb, blocksize);
346 sbi->s_partition_size = size;
348 /* The root block location that was calculated above is not
349 * correct if the partition size is an odd number of 512-
350 * byte blocks, which will be rounded down to a number of
351 * 1024-byte blocks, and if there were an even number of
352 * reserved blocks. Ideally, all partition checkers should
353 * report the real number of blocks of the real blocksize,
354 * but since this just cannot be done, we have to try to
355 * find the root block anyways. In the above case, it is one
356 * block behind the calculated one. So we check this one, too.
358 for (num_bm = 0; num_bm < 2; num_bm++) {
359 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
360 "size=%d, reserved=%d\n",
362 sbi->s_root_block + num_bm,
363 blocksize, size, reserved);
364 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
367 if (!affs_checksum_block(sb, root_bh) &&
368 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
369 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
370 sbi->s_hashsize = blocksize / 4 - 56;
371 sbi->s_root_block += num_bm;
375 affs_brelse(root_bh);
380 printk(KERN_ERR "AFFS: No valid root block on device %s\n",
384 /* N.B. after this point bh must be released */
386 root_block = sbi->s_root_block;
388 /* Find out which kind of FS we have */
389 boot_bh = sb_bread(sb, 0);
391 printk(KERN_ERR "AFFS: Cannot read boot block\n");
394 memcpy(sig, boot_bh->b_data, 4);
396 chksum = be32_to_cpu(*(__be32 *)sig);
398 /* Dircache filesystems are compatible with non-dircache ones
399 * when reading. As long as they aren't supported, writing is
402 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
403 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
404 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
406 sb->s_flags |= MS_RDONLY;
412 sbi->s_flags |= SF_MUFS;
416 sbi->s_flags |= SF_INTL;
419 sbi->s_flags |= SF_MUFS;
424 sbi->s_flags |= SF_MUFS;
427 sbi->s_flags |= SF_OFS;
428 sb->s_flags |= MS_NOEXEC;
432 sbi->s_flags |= SF_MUFS;
435 sbi->s_flags |= SF_INTL | SF_OFS;
436 sb->s_flags |= MS_NOEXEC;
439 printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
444 if (mount_flags & SF_VERBOSE) {
445 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
446 printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
448 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
449 sig, sig[3] + '0', blocksize);
452 sb->s_flags |= MS_NODEV | MS_NOSUID;
454 sbi->s_data_blksize = sb->s_blocksize;
455 if (sbi->s_flags & SF_OFS)
456 sbi->s_data_blksize -= 24;
458 /* Keep super block in cache */
459 sbi->s_root_bh = root_bh;
460 /* N.B. after this point s_root_bh must be released */
462 tmp_flags = sb->s_flags;
463 if (affs_init_bitmap(sb, &tmp_flags))
465 sb->s_flags = tmp_flags;
467 /* set up enough so that it can read an inode */
469 root_inode = affs_iget(sb, root_block);
470 if (IS_ERR(root_inode)) {
471 ret = PTR_ERR(root_inode);
472 goto out_error_noinode;
475 sb->s_root = d_alloc_root(root_inode);
477 printk(KERN_ERR "AFFS: Get root inode failed\n");
480 sb->s_root->d_op = &affs_dentry_operations;
482 pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
486 * 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)) {
548 if (*flags & MS_RDONLY) {
549 affs_write_super(sb);
550 affs_free_bitmap(sb);
552 res = affs_init_bitmap(sb, flags);
559 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
561 struct super_block *sb = dentry->d_sb;
563 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
565 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
566 AFFS_SB(sb)->s_reserved);
568 free = affs_count_free_blocks(sb);
569 buf->f_type = AFFS_SUPER_MAGIC;
570 buf->f_bsize = sb->s_blocksize;
571 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
573 buf->f_bavail = free;
574 buf->f_fsid.val[0] = (u32)id;
575 buf->f_fsid.val[1] = (u32)(id >> 32);
580 static int affs_get_sb(struct file_system_type *fs_type,
581 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
583 return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super,
587 static struct file_system_type affs_fs_type = {
588 .owner = THIS_MODULE,
590 .get_sb = affs_get_sb,
591 .kill_sb = kill_block_super,
592 .fs_flags = FS_REQUIRES_DEV,
595 static int __init init_affs_fs(void)
597 int err = init_inodecache();
600 err = register_filesystem(&affs_fs_type);
605 destroy_inodecache();
610 static void __exit exit_affs_fs(void)
612 unregister_filesystem(&affs_fs_type);
613 destroy_inodecache();
616 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
617 MODULE_LICENSE("GPL");
619 module_init(init_affs_fs)
620 module_exit(exit_affs_fs)