[net-next-2.6.git] / fs / affs / super.c

/*
 *  linux/fs/affs/inode.c
 *
 *  (c) 1996  Hans-Joachim Widmaier - Rewritten
 *
 *  (C) 1993  Ray Burr - Modified for Amiga FFS filesystem.
 *
 *  (C) 1992  Eric Youngdale Modified for ISO 9660 filesystem.
 *
 *  (C) 1991  Linus Torvalds - minix filesystem
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/statfs.h>
#include <linux/parser.h>
#include <linux/magic.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include "affs.h"

extern struct timezone sys_tz;

static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
static int affs_remount (struct super_block *sb, int *flags, char *data);

static void
affs_commit_super(struct super_block *sb, int wait, int clean)
{
	struct affs_sb_info *sbi = AFFS_SB(sb);
	struct buffer_head *bh = sbi->s_root_bh;
	struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);

	tail->bm_flag = cpu_to_be32(clean);
	secs_to_datestamp(get_seconds(), &tail->disk_change);
	affs_fix_checksum(sb, bh);
	mark_buffer_dirty(bh);
	if (wait)
		sync_dirty_buffer(bh);
}

static void
affs_put_super(struct super_block *sb)
{
	struct affs_sb_info *sbi = AFFS_SB(sb);
	pr_debug("AFFS: put_super()\n");

	if (!(sb->s_flags & MS_RDONLY) && sb->s_dirt)
		affs_commit_super(sb, 1, 1);

	kfree(sbi->s_prefix);
	affs_free_bitmap(sb);
	affs_brelse(sbi->s_root_bh);
	kfree(sbi);
	sb->s_fs_info = NULL;
}

static void
affs_write_super(struct super_block *sb)
{
	lock_super(sb);
	if (!(sb->s_flags & MS_RDONLY))
		affs_commit_super(sb, 1, 2);
	sb->s_dirt = 0;
	unlock_super(sb);

	pr_debug("AFFS: write_super() at %lu, clean=2\n", get_seconds());
}

static int
affs_sync_fs(struct super_block *sb, int wait)
{
	lock_super(sb);
	affs_commit_super(sb, wait, 2);
	sb->s_dirt = 0;
	unlock_super(sb);
	return 0;
}

static struct kmem_cache * affs_inode_cachep;

static struct inode *affs_alloc_inode(struct super_block *sb)
{
	struct affs_inode_info *i;

	i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
	if (!i)
		return NULL;

	i->vfs_inode.i_version = 1;
	i->i_lc = NULL;
	i->i_ext_bh = NULL;
	i->i_pa_cnt = 0;

	return &i->vfs_inode;
}

static void affs_destroy_inode(struct inode *inode)
{
	kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
}

static void init_once(void *foo)
{
	struct affs_inode_info *ei = (struct affs_inode_info *) foo;

	sema_init(&ei->i_link_lock, 1);
	sema_init(&ei->i_ext_lock, 1);
	inode_init_once(&ei->vfs_inode);
}

static int init_inodecache(void)
{
	affs_inode_cachep = kmem_cache_create("affs_inode_cache",
					     sizeof(struct affs_inode_info),
					     0, (SLAB_RECLAIM_ACCOUNT|
						SLAB_MEM_SPREAD),
					     init_once);
	if (affs_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
	kmem_cache_destroy(affs_inode_cachep);
}

static const struct super_operations affs_sops = {
	.alloc_inode	= affs_alloc_inode,
	.destroy_inode	= affs_destroy_inode,
	.write_inode	= affs_write_inode,
	.evict_inode	= affs_evict_inode,
	.put_super	= affs_put_super,
	.write_super	= affs_write_super,
	.sync_fs	= affs_sync_fs,
	.statfs		= affs_statfs,
	.remount_fs	= affs_remount,
	.show_options	= generic_show_options,
};

enum {
	Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
	Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
	Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
};

static const match_table_t tokens = {
	{Opt_bs, "bs=%u"},
	{Opt_mode, "mode=%o"},
	{Opt_mufs, "mufs"},
	{Opt_prefix, "prefix=%s"},
	{Opt_protect, "protect"},
	{Opt_reserved, "reserved=%u"},
	{Opt_root, "root=%u"},
	{Opt_setgid, "setgid=%u"},
	{Opt_setuid, "setuid=%u"},
	{Opt_verbose, "verbose"},
	{Opt_volume, "volume=%s"},
	{Opt_ignore, "grpquota"},
	{Opt_ignore, "noquota"},
	{Opt_ignore, "quota"},
	{Opt_ignore, "usrquota"},
	{Opt_err, NULL},
};

static int
parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
		int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
{
	char *p;
	substring_t args[MAX_OPT_ARGS];

	/* Fill in defaults */

	*uid        = current_uid();
	*gid        = current_gid();
	*reserved   = 2;
	*root       = -1;
	*blocksize  = -1;
	volume[0]   = ':';
	volume[1]   = 0;
	*mount_opts = 0;
	if (!options)
		return 1;

	while ((p = strsep(&options, ",")) != NULL) {
		int token, n, option;
		if (!*p)
			continue;

		token = match_token(p, tokens, args);
		switch (token) {
		case Opt_bs:
			if (match_int(&args[0], &n))
				return 0;
			if (n != 512 && n != 1024 && n != 2048
			    && n != 4096) {
				printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
				return 0;
			}
			*blocksize = n;
			break;
		case Opt_mode:
			if (match_octal(&args[0], &option))
				return 0;
			*mode = option & 0777;
			*mount_opts |= SF_SETMODE;
			break;
		case Opt_mufs:
			*mount_opts |= SF_MUFS;
			break;
		case Opt_prefix:
			*prefix = match_strdup(&args[0]);
			if (!*prefix)
				return 0;
			*mount_opts |= SF_PREFIX;
			break;
		case Opt_protect:
			*mount_opts |= SF_IMMUTABLE;
			break;
		case Opt_reserved:
			if (match_int(&args[0], reserved))
				return 0;
			break;
		case Opt_root:
			if (match_int(&args[0], root))
				return 0;
			break;
		case Opt_setgid:
			if (match_int(&args[0], &option))
				return 0;
			*gid = option;
			*mount_opts |= SF_SETGID;
			break;
		case Opt_setuid:
			if (match_int(&args[0], &option))
				return 0;
			*uid = option;
			*mount_opts |= SF_SETUID;
			break;
		case Opt_verbose:
			*mount_opts |= SF_VERBOSE;
			break;
		case Opt_volume: {
			char *vol = match_strdup(&args[0]);
			if (!vol)
				return 0;
			strlcpy(volume, vol, 32);
			kfree(vol);
			break;
		}
		case Opt_ignore:
		 	/* Silently ignore the quota options */
			break;
		default:
			printk("AFFS: Unrecognized mount option \"%s\" "
					"or missing value\n", p);
			return 0;
		}
	}
	return 1;
}

/* This function definitely needs to be split up. Some fine day I'll
 * hopefully have the guts to do so. Until then: sorry for the mess.
 */

static int affs_fill_super(struct super_block *sb, void *data, int silent)
{
	struct affs_sb_info	*sbi;
	struct buffer_head	*root_bh = NULL;
	struct buffer_head	*boot_bh;
	struct inode		*root_inode = NULL;
	s32			 root_block;
	int			 size, blocksize;
	u32			 chksum;
	int			 num_bm;
	int			 i, j;
	s32			 key;
	uid_t			 uid;
	gid_t			 gid;
	int			 reserved;
	unsigned long		 mount_flags;
	int			 tmp_flags;	/* fix remount prototype... */
	u8			 sig[4];
	int			 ret = -EINVAL;

	save_mount_options(sb, data);

	pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");

	sb->s_magic             = AFFS_SUPER_MAGIC;
	sb->s_op                = &affs_sops;
	sb->s_flags |= MS_NODIRATIME;

	sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
	if (!sbi)
		return -ENOMEM;

	sb->s_fs_info = sbi;
	mutex_init(&sbi->s_bmlock);
	spin_lock_init(&sbi->symlink_lock);

	if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
				&blocksize,&sbi->s_prefix,
				sbi->s_volume, &mount_flags)) {
		printk(KERN_ERR "AFFS: Error parsing options\n");
		kfree(sbi->s_prefix);
		kfree(sbi);
		return -EINVAL;
	}
	/* N.B. after this point s_prefix must be released */

	sbi->s_flags   = mount_flags;
	sbi->s_mode    = i;
	sbi->s_uid     = uid;
	sbi->s_gid     = gid;
	sbi->s_reserved= reserved;

	/* Get the size of the device in 512-byte blocks.
	 * If we later see that the partition uses bigger
	 * blocks, we will have to change it.
	 */

	size = sb->s_bdev->bd_inode->i_size >> 9;
	pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);

	affs_set_blocksize(sb, PAGE_SIZE);
	/* Try to find root block. Its location depends on the block size. */

	i = 512;
	j = 4096;
	if (blocksize > 0) {
		i = j = blocksize;
		size = size / (blocksize / 512);
	}
	for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
		sbi->s_root_block = root_block;
		if (root_block < 0)
			sbi->s_root_block = (reserved + size - 1) / 2;
		pr_debug("AFFS: setting blocksize to %d\n", blocksize);
		affs_set_blocksize(sb, blocksize);
		sbi->s_partition_size = size;

		/* The root block location that was calculated above is not
		 * correct if the partition size is an odd number of 512-
		 * byte blocks, which will be rounded down to a number of
		 * 1024-byte blocks, and if there were an even number of
		 * reserved blocks. Ideally, all partition checkers should
		 * report the real number of blocks of the real blocksize,
		 * but since this just cannot be done, we have to try to
		 * find the root block anyways. In the above case, it is one
		 * block behind the calculated one. So we check this one, too.
		 */
		for (num_bm = 0; num_bm < 2; num_bm++) {
			pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
				"size=%d, reserved=%d\n",
				sb->s_id,
				sbi->s_root_block + num_bm,
				blocksize, size, reserved);
			root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
			if (!root_bh)
				continue;
			if (!affs_checksum_block(sb, root_bh) &&
			    be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
			    be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
				sbi->s_hashsize    = blocksize / 4 - 56;
				sbi->s_root_block += num_bm;
				key                        = 1;
				goto got_root;
			}
			affs_brelse(root_bh);
			root_bh = NULL;
		}
	}
	if (!silent)
		printk(KERN_ERR "AFFS: No valid root block on device %s\n",
			sb->s_id);
	goto out_error;

	/* N.B. after this point bh must be released */
got_root:
	root_block = sbi->s_root_block;

	/* Find out which kind of FS we have */
	boot_bh = sb_bread(sb, 0);
	if (!boot_bh) {
		printk(KERN_ERR "AFFS: Cannot read boot block\n");
		goto out_error;
	}
	memcpy(sig, boot_bh->b_data, 4);
	brelse(boot_bh);
	chksum = be32_to_cpu(*(__be32 *)sig);

	/* Dircache filesystems are compatible with non-dircache ones
	 * when reading. As long as they aren't supported, writing is
	 * not recommended.
	 */
	if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
	     || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
		printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
			sb->s_id);
		sb->s_flags |= MS_RDONLY;
	}
	switch (chksum) {
		case MUFS_FS:
		case MUFS_INTLFFS:
		case MUFS_DCFFS:
			sbi->s_flags |= SF_MUFS;
			/* fall thru */
		case FS_INTLFFS:
		case FS_DCFFS:
			sbi->s_flags |= SF_INTL;
			break;
		case MUFS_FFS:
			sbi->s_flags |= SF_MUFS;
			break;
		case FS_FFS:
			break;
		case MUFS_OFS:
			sbi->s_flags |= SF_MUFS;
			/* fall thru */
		case FS_OFS:
			sbi->s_flags |= SF_OFS;
			sb->s_flags |= MS_NOEXEC;
			break;
		case MUFS_DCOFS:
		case MUFS_INTLOFS:
			sbi->s_flags |= SF_MUFS;
		case FS_DCOFS:
		case FS_INTLOFS:
			sbi->s_flags |= SF_INTL | SF_OFS;
			sb->s_flags |= MS_NOEXEC;
			break;
		default:
			printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
				sb->s_id, chksum);
			goto out_error;
	}

	if (mount_flags & SF_VERBOSE) {
		u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
		printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
			len > 31 ? 31 : len,
			AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
			sig, sig[3] + '0', blocksize);
	}

	sb->s_flags |= MS_NODEV | MS_NOSUID;

	sbi->s_data_blksize = sb->s_blocksize;
	if (sbi->s_flags & SF_OFS)
		sbi->s_data_blksize -= 24;

	/* Keep super block in cache */
	sbi->s_root_bh = root_bh;
	/* N.B. after this point s_root_bh must be released */

	tmp_flags = sb->s_flags;
	if (affs_init_bitmap(sb, &tmp_flags))
		goto out_error;
	sb->s_flags = tmp_flags;

	/* set up enough so that it can read an inode */

	root_inode = affs_iget(sb, root_block);
	if (IS_ERR(root_inode)) {
		ret = PTR_ERR(root_inode);
		goto out_error_noinode;
	}

	sb->s_root = d_alloc_root(root_inode);
	if (!sb->s_root) {
		printk(KERN_ERR "AFFS: Get root inode failed\n");
		goto out_error;
	}
	sb->s_root->d_op = &affs_dentry_operations;

	pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
	return 0;

	/*
	 * Begin the cascaded cleanup ...
	 */
out_error:
	if (root_inode)
		iput(root_inode);
out_error_noinode:
	kfree(sbi->s_bitmap);
	affs_brelse(root_bh);
	kfree(sbi->s_prefix);
	kfree(sbi);
	sb->s_fs_info = NULL;
	return ret;
}

static int
affs_remount(struct super_block *sb, int *flags, char *data)
{
	struct affs_sb_info	*sbi = AFFS_SB(sb);
	int			 blocksize;
	uid_t			 uid;
	gid_t			 gid;
	int			 mode;
	int			 reserved;
	int			 root_block;
	unsigned long		 mount_flags;
	int			 res = 0;
	char			*new_opts = kstrdup(data, GFP_KERNEL);
	char			 volume[32];
	char			*prefix = NULL;

	pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);

	*flags |= MS_NODIRATIME;

	memcpy(volume, sbi->s_volume, 32);
	if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
			   &blocksize, &prefix, volume,
			   &mount_flags)) {
		kfree(prefix);
		kfree(new_opts);
		return -EINVAL;
	}

	replace_mount_options(sb, new_opts);

	sbi->s_flags = mount_flags;
	sbi->s_mode  = mode;
	sbi->s_uid   = uid;
	sbi->s_gid   = gid;
	/* protect against readers */
	spin_lock(&sbi->symlink_lock);
	if (prefix) {
		kfree(sbi->s_prefix);
		sbi->s_prefix = prefix;
	}
	memcpy(sbi->s_volume, volume, 32);
	spin_unlock(&sbi->symlink_lock);

	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
		return 0;

	if (*flags & MS_RDONLY) {
		affs_write_super(sb);
		affs_free_bitmap(sb);
	} else
		res = affs_init_bitmap(sb, flags);

	return res;
}

static int
affs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct super_block *sb = dentry->d_sb;
	int		 free;
	u64		 id = huge_encode_dev(sb->s_bdev->bd_dev);

	pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
	     AFFS_SB(sb)->s_reserved);

	free          = affs_count_free_blocks(sb);
	buf->f_type    = AFFS_SUPER_MAGIC;
	buf->f_bsize   = sb->s_blocksize;
	buf->f_blocks  = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
	buf->f_bfree   = free;
	buf->f_bavail  = free;
	buf->f_fsid.val[0] = (u32)id;
	buf->f_fsid.val[1] = (u32)(id >> 32);
	buf->f_namelen = 30;
	return 0;
}

static struct dentry *affs_mount(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data)
{
	return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
}

static struct file_system_type affs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "affs",
	.mount		= affs_mount,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};

static int __init init_affs_fs(void)
{
	int err = init_inodecache();
	if (err)
		goto out1;
	err = register_filesystem(&affs_fs_type);
	if (err)
		goto out;
	return 0;
out:
	destroy_inodecache();
out1:
	return err;
}

static void __exit exit_affs_fs(void)
{
	unregister_filesystem(&affs_fs_type);
	destroy_inodecache();
}

MODULE_DESCRIPTION("Amiga filesystem support for Linux");
MODULE_LICENSE("GPL");

module_init(init_affs_fs)
module_exit(exit_affs_fs)
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/affs/inode.c
	3	*
	4	* (c) 1996 Hans-Joachim Widmaier - Rewritten
	5	*
	6	* (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
	7	*
	8	* (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
	9	*
	10	* (C) 1991 Linus Torvalds - minix filesystem
	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/init.h>
	15	#include <linux/statfs.h>
	16	#include <linux/parser.h>
e18fa700	17	#include <linux/magic.h>
e8edc6e0	18	#include <linux/sched.h>
5a0e3ad6	19	#include <linux/slab.h>
1da177e4 LT	20	#include "affs.h"
	21
	22	extern struct timezone sys_tz;
	23
726c3342	24	static int affs_statfs(struct dentry dentry, struct kstatfs buf);
1da177e4 LT	25	static int affs_remount (struct super_block sb, int flags, char *data);
1da177e4 LT	26
e2896436	27	static void
7435d506	28	affs_commit_super(struct super_block *sb, int wait, int clean)
e2896436 CH	29	{
	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);
	33
	34	tail->bm_flag = cpu_to_be32(clean);
	35	secs_to_datestamp(get_seconds(), &tail->disk_change);
	36	affs_fix_checksum(sb, bh);
	37	mark_buffer_dirty(bh);
7435d506 AB	38	if (wait)
7435d506 AB	39	sync_dirty_buffer(bh);
e2896436 CH	40	}
e2896436 CH	41
1da177e4 LT	42	static void
	43	affs_put_super(struct super_block *sb)
	44	{
	45	struct affs_sb_info *sbi = AFFS_SB(sb);
	46	pr_debug("AFFS: put_super()\n");
	47
7435d506 AB	48	if (!(sb->s_flags & MS_RDONLY) && sb->s_dirt)
7435d506 AB	49	affs_commit_super(sb, 1, 1);
1da177e4	50
f99d49ad	51	kfree(sbi->s_prefix);
1da177e4 LT	52	affs_free_bitmap(sb);
	53	affs_brelse(sbi->s_root_bh);
	54	kfree(sbi);
	55	sb->s_fs_info = NULL;
1da177e4 LT	56	}
	57
	58	static void
	59	affs_write_super(struct super_block *sb)
	60	{
ebc1ac16	61	lock_super(sb);
669d5f1f	62	if (!(sb->s_flags & MS_RDONLY))
7435d506	63	affs_commit_super(sb, 1, 2);
669d5f1f	64	sb->s_dirt = 0;
ebc1ac16	65	unlock_super(sb);
1da177e4	66
669d5f1f	67	pr_debug("AFFS: write_super() at %lu, clean=2\n", get_seconds());
1da177e4 LT	68	}
1da177e4 LT	69
e2896436 CH	70	static int
	71	affs_sync_fs(struct super_block *sb, int wait)
	72	{
	73	lock_super(sb);
7435d506	74	affs_commit_super(sb, wait, 2);
e2896436 CH	75	sb->s_dirt = 0;
	76	unlock_super(sb);
	77	return 0;
	78	}
	79
e18b890b	80	static struct kmem_cache * affs_inode_cachep;
1da177e4 LT	81
	82	static struct inode affs_alloc_inode(struct super_block sb)
	83	{
dca3c336 RZ	84	struct affs_inode_info *i;
	85
	86	i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
	87	if (!i)
1da177e4	88	return NULL;
dca3c336 RZ	89
	90	i->vfs_inode.i_version = 1;
	91	i->i_lc = NULL;
	92	i->i_ext_bh = NULL;
	93	i->i_pa_cnt = 0;
	94
	95	return &i->vfs_inode;
1da177e4 LT	96	}
	97
	98	static void affs_destroy_inode(struct inode *inode)
	99	{
	100	kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
	101	}
	102
51cc5068	103	static void init_once(void *foo)
1da177e4 LT	104	{
	105	struct affs_inode_info ei = (struct affs_inode_info ) foo;
	106
756b0322 TG	107	sema_init(&ei->i_link_lock, 1);
756b0322 TG	108	sema_init(&ei->i_ext_lock, 1);
a35afb83	109	inode_init_once(&ei->vfs_inode);
1da177e4 LT	110	}
	111
	112	static int init_inodecache(void)
	113	{
	114	affs_inode_cachep = kmem_cache_create("affs_inode_cache",
	115	sizeof(struct affs_inode_info),
fffb60f9 PJ	116	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	117	SLAB_MEM_SPREAD),
20c2df83	118	init_once);
1da177e4 LT	119	if (affs_inode_cachep == NULL)
	120	return -ENOMEM;
	121	return 0;
	122	}
	123
	124	static void destroy_inodecache(void)
	125	{
1a1d92c1	126	kmem_cache_destroy(affs_inode_cachep);
1da177e4 LT	127	}
1da177e4 LT	128
ee9b6d61	129	static const struct super_operations affs_sops = {
1da177e4 LT	130	.alloc_inode = affs_alloc_inode,
1da177e4 LT	131	.destroy_inode = affs_destroy_inode,
1da177e4	132	.write_inode = affs_write_inode,
f053ddde	133	.evict_inode = affs_evict_inode,
1da177e4 LT	134	.put_super = affs_put_super,
1da177e4 LT	135	.write_super = affs_write_super,
e2896436	136	.sync_fs = affs_sync_fs,
1da177e4 LT	137	.statfs = affs_statfs,
1da177e4 LT	138	.remount_fs = affs_remount,
e9b3961b	139	.show_options = generic_show_options,
1da177e4 LT	140	};
	141
	142	enum {
	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,
	146	};
	147
a447c093	148	static const match_table_t tokens = {
1da177e4 LT	149	{Opt_bs, "bs=%u"},
	150	{Opt_mode, "mode=%o"},
	151	{Opt_mufs, "mufs"},
	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"},
	164	{Opt_err, NULL},
	165	};
	166
	167	static int
	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)
	170	{
	171	char *p;
	172	substring_t args[MAX_OPT_ARGS];
	173
	174	/* Fill in defaults */
	175
21559981 DH	176	*uid = current_uid();
21559981 DH	177	*gid = current_gid();
1da177e4 LT	178	*reserved = 2;
	179	*root = -1;
	180	*blocksize = -1;
	181	volume[0] = ':';
	182	volume[1] = 0;
	183	*mount_opts = 0;
	184	if (!options)
	185	return 1;
	186
	187	while ((p = strsep(&options, ",")) != NULL) {
	188	int token, n, option;
	189	if (!*p)
	190	continue;
	191
	192	token = match_token(p, tokens, args);
	193	switch (token) {
	194	case Opt_bs:
	195	if (match_int(&args[0], &n))
217686e9	196	return 0;
1da177e4 LT	197	if (n != 512 && n != 1024 && n != 2048
	198	&& n != 4096) {
	199	printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
	200	return 0;
	201	}
	202	*blocksize = n;
	203	break;
	204	case Opt_mode:
	205	if (match_octal(&args[0], &option))
217686e9	206	return 0;
1da177e4 LT	207	*mode = option & 0777;
	208	*mount_opts \|= SF_SETMODE;
	209	break;
	210	case Opt_mufs:
	211	*mount_opts \|= SF_MUFS;
	212	break;
	213	case Opt_prefix:
1da177e4 LT	214	*prefix = match_strdup(&args[0]);
	215	if (!*prefix)
	216	return 0;
	217	*mount_opts \|= SF_PREFIX;
	218	break;
	219	case Opt_protect:
	220	*mount_opts \|= SF_IMMUTABLE;
	221	break;
	222	case Opt_reserved:
	223	if (match_int(&args[0], reserved))
217686e9	224	return 0;
1da177e4 LT	225	break;
	226	case Opt_root:
	227	if (match_int(&args[0], root))
217686e9	228	return 0;
1da177e4 LT	229	break;
	230	case Opt_setgid:
	231	if (match_int(&args[0], &option))
217686e9	232	return 0;
1da177e4 LT	233	*gid = option;
	234	*mount_opts \|= SF_SETGID;
	235	break;
	236	case Opt_setuid:
	237	if (match_int(&args[0], &option))
217686e9	238	return 0;
1da177e4 LT	239	*uid = option;
	240	*mount_opts \|= SF_SETUID;
	241	break;
	242	case Opt_verbose:
	243	*mount_opts \|= SF_VERBOSE;
	244	break;
	245	case Opt_volume: {
	246	char *vol = match_strdup(&args[0]);
6db27dd9 JM	247	if (!vol)
6db27dd9 JM	248	return 0;
1da177e4 LT	249	strlcpy(volume, vol, 32);
	250	kfree(vol);
	251	break;
	252	}
	253	case Opt_ignore:
	254	/* Silently ignore the quota options */
	255	break;
	256	default:
	257	printk("AFFS: Unrecognized mount option \"%s\" "
	258	"or missing value\n", p);
	259	return 0;
	260	}
	261	}
	262	return 1;
	263	}
	264
	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.
	267	*/
	268
	269	static int affs_fill_super(struct super_block sb, void data, int silent)
	270	{
	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;
	275	s32 root_block;
	276	int size, blocksize;
	277	u32 chksum;
	278	int num_bm;
	279	int i, j;
	280	s32 key;
	281	uid_t uid;
	282	gid_t gid;
	283	int reserved;
	284	unsigned long mount_flags;
	285	int tmp_flags; /* fix remount prototype... */
2b943cf0	286	u8 sig[4];
210f8559	287	int ret = -EINVAL;
1da177e4	288
e9b3961b MS	289	save_mount_options(sb, data);
e9b3961b MS	290
1da177e4 LT	291	pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
	292
	293	sb->s_magic = AFFS_SUPER_MAGIC;
	294	sb->s_op = &affs_sops;
	295	sb->s_flags \|= MS_NODIRATIME;
	296
f8314dc6	297	sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
1da177e4 LT	298	if (!sbi)
1da177e4 LT	299	return -ENOMEM;
74c41429	300
1da177e4	301	sb->s_fs_info = sbi;
7d135a5d	302	mutex_init(&sbi->s_bmlock);
29333920	303	spin_lock_init(&sbi->symlink_lock);
1da177e4 LT	304
	305	if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
	306	&blocksize,&sbi->s_prefix,
	307	sbi->s_volume, &mount_flags)) {
	308	printk(KERN_ERR "AFFS: Error parsing options\n");
afc70ed0 AV	309	kfree(sbi->s_prefix);
afc70ed0 AV	310	kfree(sbi);
1da177e4 LT	311	return -EINVAL;
	312	}
	313	/* N.B. after this point s_prefix must be released */
	314
	315	sbi->s_flags = mount_flags;
	316	sbi->s_mode = i;
	317	sbi->s_uid = uid;
	318	sbi->s_gid = gid;
	319	sbi->s_reserved= reserved;
	320
	321	/* Get the size of the device in 512-byte blocks.
	322	* If we later see that the partition uses bigger
	323	* blocks, we will have to change it.
	324	*/
	325
	326	size = sb->s_bdev->bd_inode->i_size >> 9;
	327	pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
	328
	329	affs_set_blocksize(sb, PAGE_SIZE);
	330	/* Try to find root block. Its location depends on the block size. */
	331
	332	i = 512;
	333	j = 4096;
	334	if (blocksize > 0) {
	335	i = j = blocksize;
	336	size = size / (blocksize / 512);
	337	}
	338	for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
	339	sbi->s_root_block = root_block;
	340	if (root_block < 0)
	341	sbi->s_root_block = (reserved + size - 1) / 2;
	342	pr_debug("AFFS: setting blocksize to %d\n", blocksize);
	343	affs_set_blocksize(sb, blocksize);
	344	sbi->s_partition_size = size;
	345
	346	/* The root block location that was calculated above is not
	347	* correct if the partition size is an odd number of 512-
	348	* byte blocks, which will be rounded down to a number of
	349	* 1024-byte blocks, and if there were an even number of
	350	* reserved blocks. Ideally, all partition checkers should
	351	* report the real number of blocks of the real blocksize,
	352	* but since this just cannot be done, we have to try to
	353	* find the root block anyways. In the above case, it is one
	354	* block behind the calculated one. So we check this one, too.
	355	*/
	356	for (num_bm = 0; num_bm < 2; num_bm++) {
	357	pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
	358	"size=%d, reserved=%d\n",
	359	sb->s_id,
	360	sbi->s_root_block + num_bm,
	361	blocksize, size, reserved);
	362	root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
	363	if (!root_bh)
	364	continue;
	365	if (!affs_checksum_block(sb, root_bh) &&
	366	be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
	367	be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
	368	sbi->s_hashsize = blocksize / 4 - 56;
	369	sbi->s_root_block += num_bm;
	370	key = 1;
	371	goto got_root;
	372	}
	373	affs_brelse(root_bh);
	374	root_bh = NULL;
375	}
376	}
377	if (!silent)
378	printk(KERN_ERR "AFFS: No valid root block on device %s\n",
379	sb->s_id);
380	goto out_error;
381
382	/* N.B. after this point bh must be released */
383	got_root:
384	root_block = sbi->s_root_block;
385
386	/* Find out which kind of FS we have */
387	boot_bh = sb_bread(sb, 0);
388	if (!boot_bh) {
389	printk(KERN_ERR "AFFS: Cannot read boot block\n");
390	goto out_error;
391	}
2b943cf0	392	memcpy(sig, boot_bh->b_data, 4);
1da177e4	393	brelse(boot_bh);
2b943cf0	394	chksum = be32_to_cpu((__be32 )sig);
1da177e4 LT	395
	396	/* Dircache filesystems are compatible with non-dircache ones
	397	* when reading. As long as they aren't supported, writing is
	398	* not recommended.
	399	*/
	400	if ((chksum == FS_DCFFS \|\| chksum == MUFS_DCFFS \|\| chksum == FS_DCOFS
	401	\|\| chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
	402	printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
	403	sb->s_id);
	404	sb->s_flags \|= MS_RDONLY;
	405	}
	406	switch (chksum) {
	407	case MUFS_FS:
	408	case MUFS_INTLFFS:
	409	case MUFS_DCFFS:
	410	sbi->s_flags \|= SF_MUFS;
	411	/* fall thru */
	412	case FS_INTLFFS:
	413	case FS_DCFFS:
	414	sbi->s_flags \|= SF_INTL;
	415	break;
	416	case MUFS_FFS:
	417	sbi->s_flags \|= SF_MUFS;
	418	break;
	419	case FS_FFS:
	420	break;
	421	case MUFS_OFS:
	422	sbi->s_flags \|= SF_MUFS;
	423	/* fall thru */
	424	case FS_OFS:
	425	sbi->s_flags \|= SF_OFS;
	426	sb->s_flags \|= MS_NOEXEC;
	427	break;
	428	case MUFS_DCOFS:
	429	case MUFS_INTLOFS:
	430	sbi->s_flags \|= SF_MUFS;
	431	case FS_DCOFS:
	432	case FS_INTLOFS:
	433	sbi->s_flags \|= SF_INTL \| SF_OFS;
	434	sb->s_flags \|= MS_NOEXEC;
	435	break;
	436	default:
	437	printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
	438	sb->s_id, chksum);
	439	goto out_error;
	440	}
	441
	442	if (mount_flags & SF_VERBOSE) {
2b943cf0 AV	443	u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
	444	printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
	445	len > 31 ? 31 : len,
1da177e4	446	AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
2b943cf0	447	sig, sig[3] + '0', blocksize);
1da177e4 LT	448	}
	449
	450	sb->s_flags \|= MS_NODEV \| MS_NOSUID;
	451
	452	sbi->s_data_blksize = sb->s_blocksize;
	453	if (sbi->s_flags & SF_OFS)
	454	sbi->s_data_blksize -= 24;
	455
	456	/* Keep super block in cache */
	457	sbi->s_root_bh = root_bh;
	458	/* N.B. after this point s_root_bh must be released */
	459
	460	tmp_flags = sb->s_flags;
	461	if (affs_init_bitmap(sb, &tmp_flags))
	462	goto out_error;
	463	sb->s_flags = tmp_flags;
	464
	465	/* set up enough so that it can read an inode */
	466
210f8559 DH	467	root_inode = affs_iget(sb, root_block);
	468	if (IS_ERR(root_inode)) {
	469	ret = PTR_ERR(root_inode);
	470	goto out_error_noinode;
	471	}
	472
1da177e4 LT	473	sb->s_root = d_alloc_root(root_inode);
	474	if (!sb->s_root) {
	475	printk(KERN_ERR "AFFS: Get root inode failed\n");
	476	goto out_error;
	477	}
	478	sb->s_root->d_op = &affs_dentry_operations;
	479
	480	pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
	481	return 0;
	482
	483	/*
	484	* Begin the cascaded cleanup ...
	485	*/
	486	out_error:
	487	if (root_inode)
	488	iput(root_inode);
210f8559	489	out_error_noinode:
f99d49ad	490	kfree(sbi->s_bitmap);
1da177e4	491	affs_brelse(root_bh);
f99d49ad	492	kfree(sbi->s_prefix);
1da177e4 LT	493	kfree(sbi);
1da177e4 LT	494	sb->s_fs_info = NULL;
210f8559	495	return ret;
1da177e4 LT	496	}
	497
	498	static int
	499	affs_remount(struct super_block sb, int flags, char *data)
	500	{
	501	struct affs_sb_info *sbi = AFFS_SB(sb);
	502	int blocksize;
	503	uid_t uid;
	504	gid_t gid;
	505	int mode;
	506	int reserved;
	507	int root_block;
	508	unsigned long mount_flags;
	509	int res = 0;
e9b3961b	510	char *new_opts = kstrdup(data, GFP_KERNEL);
29333920 AV	511	char volume[32];
29333920 AV	512	char *prefix = NULL;
1da177e4 LT	513
	514	pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
	515
	516	*flags \|= MS_NODIRATIME;
	517
29333920	518	memcpy(volume, sbi->s_volume, 32);
e9b3961b	519	if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
29333920	520	&blocksize, &prefix, volume,
e9b3961b	521	&mount_flags)) {
29333920	522	kfree(prefix);
e9b3961b	523	kfree(new_opts);
1da177e4	524	return -EINVAL;
e9b3961b	525	}
74c41429	526
2a32cebd	527	replace_mount_options(sb, new_opts);
e9b3961b	528
1da177e4 LT	529	sbi->s_flags = mount_flags;
	530	sbi->s_mode = mode;
	531	sbi->s_uid = uid;
	532	sbi->s_gid = gid;
29333920 AV	533	/* protect against readers */
	534	spin_lock(&sbi->symlink_lock);
	535	if (prefix) {
	536	kfree(sbi->s_prefix);
	537	sbi->s_prefix = prefix;
	538	}
	539	memcpy(sbi->s_volume, volume, 32);
	540	spin_unlock(&sbi->symlink_lock);
1da177e4	541
74c41429	542	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
1da177e4	543	return 0;
74c41429	544
1da177e4	545	if (*flags & MS_RDONLY) {
669d5f1f	546	affs_write_super(sb);
1da177e4 LT	547	affs_free_bitmap(sb);
	548	} else
	549	res = affs_init_bitmap(sb, flags);
	550
	551	return res;
	552	}
	553
	554	static int
726c3342	555	affs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	556	{
726c3342	557	struct super_block *sb = dentry->d_sb;
1da177e4	558	int free;
a6a2a73c	559	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1da177e4 LT	560
	561	pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
	562	AFFS_SB(sb)->s_reserved);
	563
	564	free = affs_count_free_blocks(sb);
	565	buf->f_type = AFFS_SUPER_MAGIC;
	566	buf->f_bsize = sb->s_blocksize;
	567	buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
	568	buf->f_bfree = free;
	569	buf->f_bavail = free;
a6a2a73c CL	570	buf->f_fsid.val[0] = (u32)id;
	571	buf->f_fsid.val[1] = (u32)(id >> 32);
	572	buf->f_namelen = 30;
1da177e4 LT	573	return 0;
	574	}
	575
152a0836 AV	576	static struct dentry affs_mount(struct file_system_type fs_type,
152a0836 AV	577	int flags, const char dev_name, void data)
1da177e4	578	{
152a0836	579	return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
1da177e4 LT	580	}
	581
	582	static struct file_system_type affs_fs_type = {
	583	.owner = THIS_MODULE,
	584	.name = "affs",
152a0836	585	.mount = affs_mount,
1da177e4 LT	586	.kill_sb = kill_block_super,
	587	.fs_flags = FS_REQUIRES_DEV,
	588	};
	589
	590	static int __init init_affs_fs(void)
	591	{
	592	int err = init_inodecache();
	593	if (err)
	594	goto out1;
	595	err = register_filesystem(&affs_fs_type);
	596	if (err)
	597	goto out;
	598	return 0;
	599	out:
	600	destroy_inodecache();
	601	out1:
	602	return err;
	603	}
	604
	605	static void __exit exit_affs_fs(void)
	606	{
	607	unregister_filesystem(&affs_fs_type);
	608	destroy_inodecache();
	609	}
	610
	611	MODULE_DESCRIPTION("Amiga filesystem support for Linux");
	612	MODULE_LICENSE("GPL");
	613
	614	module_init(init_affs_fs)
	615	module_exit(exit_affs_fs)