[linux.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/smp_lock.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");

	lock_kernel();

	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;

	unlock_kernel();
}

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;

	init_MUTEX(&ei->i_link_lock);
	init_MUTEX(&ei->i_ext_lock);
	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;
	}
	lock_kernel();
	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)) {
		unlock_kernel();
		return 0;
	}
	if (*flags & MS_RDONLY) {
		affs_write_super(sb);
		affs_free_bitmap(sb);
	} else
		res = affs_init_bitmap(sb, flags);

	unlock_kernel();
	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 int affs_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
	return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super,
			   mnt);
}

static struct file_system_type affs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "affs",
	.get_sb		= affs_get_sb,
	.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>
337eb00a	19	#include <linux/smp_lock.h>
5a0e3ad6	20	#include <linux/slab.h>
1da177e4 LT	21	#include "affs.h"
	22
	23	extern struct timezone sys_tz;
	24
726c3342	25	static int affs_statfs(struct dentry dentry, struct kstatfs buf);
1da177e4 LT	26	static int affs_remount (struct super_block sb, int flags, char *data);
1da177e4 LT	27
e2896436	28	static void
7435d506	29	affs_commit_super(struct super_block *sb, int wait, int clean)
e2896436 CH	30	{
	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);
	34
	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);
7435d506 AB	39	if (wait)
7435d506 AB	40	sync_dirty_buffer(bh);
e2896436 CH	41	}
e2896436 CH	42
1da177e4 LT	43	static void
	44	affs_put_super(struct super_block *sb)
	45	{
	46	struct affs_sb_info *sbi = AFFS_SB(sb);
	47	pr_debug("AFFS: put_super()\n");
	48
6cfd0148 CH	49	lock_kernel();
6cfd0148 CH	50
7435d506 AB	51	if (!(sb->s_flags & MS_RDONLY) && sb->s_dirt)
7435d506 AB	52	affs_commit_super(sb, 1, 1);
1da177e4	53
f99d49ad	54	kfree(sbi->s_prefix);
1da177e4 LT	55	affs_free_bitmap(sb);
	56	affs_brelse(sbi->s_root_bh);
	57	kfree(sbi);
	58	sb->s_fs_info = NULL;
6cfd0148 CH	59
6cfd0148 CH	60	unlock_kernel();
1da177e4 LT	61	}
	62
	63	static void
	64	affs_write_super(struct super_block *sb)
	65	{
ebc1ac16	66	lock_super(sb);
669d5f1f	67	if (!(sb->s_flags & MS_RDONLY))
7435d506	68	affs_commit_super(sb, 1, 2);
669d5f1f	69	sb->s_dirt = 0;
ebc1ac16	70	unlock_super(sb);
1da177e4	71
669d5f1f	72	pr_debug("AFFS: write_super() at %lu, clean=2\n", get_seconds());
1da177e4 LT	73	}
1da177e4 LT	74
e2896436 CH	75	static int
	76	affs_sync_fs(struct super_block *sb, int wait)
	77	{
	78	lock_super(sb);
7435d506	79	affs_commit_super(sb, wait, 2);
e2896436 CH	80	sb->s_dirt = 0;
	81	unlock_super(sb);
	82	return 0;
	83	}
	84
e18b890b	85	static struct kmem_cache * affs_inode_cachep;
1da177e4 LT	86
	87	static struct inode affs_alloc_inode(struct super_block sb)
	88	{
dca3c336 RZ	89	struct affs_inode_info *i;
	90
	91	i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
	92	if (!i)
1da177e4	93	return NULL;
dca3c336 RZ	94
	95	i->vfs_inode.i_version = 1;
	96	i->i_lc = NULL;
	97	i->i_ext_bh = NULL;
	98	i->i_pa_cnt = 0;
	99
	100	return &i->vfs_inode;
1da177e4 LT	101	}
	102
	103	static void affs_destroy_inode(struct inode *inode)
	104	{
	105	kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
	106	}
	107
51cc5068	108	static void init_once(void *foo)
1da177e4 LT	109	{
	110	struct affs_inode_info ei = (struct affs_inode_info ) foo;
	111
a35afb83 CL	112	init_MUTEX(&ei->i_link_lock);
	113	init_MUTEX(&ei->i_ext_lock);
	114	inode_init_once(&ei->vfs_inode);
1da177e4 LT	115	}
	116
	117	static int init_inodecache(void)
	118	{
	119	affs_inode_cachep = kmem_cache_create("affs_inode_cache",
	120	sizeof(struct affs_inode_info),
fffb60f9 PJ	121	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	122	SLAB_MEM_SPREAD),
20c2df83	123	init_once);
1da177e4 LT	124	if (affs_inode_cachep == NULL)
	125	return -ENOMEM;
	126	return 0;
	127	}
	128
	129	static void destroy_inodecache(void)
	130	{
1a1d92c1	131	kmem_cache_destroy(affs_inode_cachep);
1da177e4 LT	132	}
1da177e4 LT	133
ee9b6d61	134	static const struct super_operations affs_sops = {
1da177e4 LT	135	.alloc_inode = affs_alloc_inode,
1da177e4 LT	136	.destroy_inode = affs_destroy_inode,
1da177e4	137	.write_inode = affs_write_inode,
f053ddde	138	.evict_inode = affs_evict_inode,
1da177e4 LT	139	.put_super = affs_put_super,
1da177e4 LT	140	.write_super = affs_write_super,
e2896436	141	.sync_fs = affs_sync_fs,
1da177e4 LT	142	.statfs = affs_statfs,
1da177e4 LT	143	.remount_fs = affs_remount,
e9b3961b	144	.show_options = generic_show_options,
1da177e4 LT	145	};
	146
	147	enum {
	148	Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
	149	Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
	150	Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
	151	};
	152
a447c093	153	static const match_table_t tokens = {
1da177e4 LT	154	{Opt_bs, "bs=%u"},
	155	{Opt_mode, "mode=%o"},
	156	{Opt_mufs, "mufs"},
	157	{Opt_prefix, "prefix=%s"},
	158	{Opt_protect, "protect"},
	159	{Opt_reserved, "reserved=%u"},
	160	{Opt_root, "root=%u"},
	161	{Opt_setgid, "setgid=%u"},
	162	{Opt_setuid, "setuid=%u"},
	163	{Opt_verbose, "verbose"},
	164	{Opt_volume, "volume=%s"},
	165	{Opt_ignore, "grpquota"},
	166	{Opt_ignore, "noquota"},
	167	{Opt_ignore, "quota"},
	168	{Opt_ignore, "usrquota"},
	169	{Opt_err, NULL},
	170	};
	171
	172	static int
	173	parse_options(char options, uid_t uid, gid_t gid, int mode, int reserved, s32 root,
	174	int blocksize, char prefix, char volume, unsigned long *mount_opts)
	175	{
	176	char *p;
	177	substring_t args[MAX_OPT_ARGS];
	178
	179	/* Fill in defaults */
	180
21559981 DH	181	*uid = current_uid();
21559981 DH	182	*gid = current_gid();
1da177e4 LT	183	*reserved = 2;
	184	*root = -1;
	185	*blocksize = -1;
	186	volume[0] = ':';
	187	volume[1] = 0;
	188	*mount_opts = 0;
	189	if (!options)
	190	return 1;
	191
	192	while ((p = strsep(&options, ",")) != NULL) {
	193	int token, n, option;
	194	if (!*p)
	195	continue;
	196
	197	token = match_token(p, tokens, args);
	198	switch (token) {
	199	case Opt_bs:
	200	if (match_int(&args[0], &n))
217686e9	201	return 0;
1da177e4 LT	202	if (n != 512 && n != 1024 && n != 2048
	203	&& n != 4096) {
	204	printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
	205	return 0;
	206	}
	207	*blocksize = n;
	208	break;
	209	case Opt_mode:
	210	if (match_octal(&args[0], &option))
217686e9	211	return 0;
1da177e4 LT	212	*mode = option & 0777;
	213	*mount_opts \|= SF_SETMODE;
	214	break;
	215	case Opt_mufs:
	216	*mount_opts \|= SF_MUFS;
	217	break;
	218	case Opt_prefix:
1da177e4 LT	219	*prefix = match_strdup(&args[0]);
	220	if (!*prefix)
	221	return 0;
	222	*mount_opts \|= SF_PREFIX;
	223	break;
	224	case Opt_protect:
	225	*mount_opts \|= SF_IMMUTABLE;
	226	break;
	227	case Opt_reserved:
	228	if (match_int(&args[0], reserved))
217686e9	229	return 0;
1da177e4 LT	230	break;
	231	case Opt_root:
	232	if (match_int(&args[0], root))
217686e9	233	return 0;
1da177e4 LT	234	break;
	235	case Opt_setgid:
	236	if (match_int(&args[0], &option))
217686e9	237	return 0;
1da177e4 LT	238	*gid = option;
	239	*mount_opts \|= SF_SETGID;
	240	break;
	241	case Opt_setuid:
	242	if (match_int(&args[0], &option))
217686e9	243	return 0;
1da177e4 LT	244	*uid = option;
	245	*mount_opts \|= SF_SETUID;
	246	break;
	247	case Opt_verbose:
	248	*mount_opts \|= SF_VERBOSE;
	249	break;
	250	case Opt_volume: {
	251	char *vol = match_strdup(&args[0]);
6db27dd9 JM	252	if (!vol)
6db27dd9 JM	253	return 0;
1da177e4 LT	254	strlcpy(volume, vol, 32);
	255	kfree(vol);
	256	break;
	257	}
	258	case Opt_ignore:
	259	/* Silently ignore the quota options */
	260	break;
	261	default:
	262	printk("AFFS: Unrecognized mount option \"%s\" "
	263	"or missing value\n", p);
	264	return 0;
	265	}
	266	}
	267	return 1;
	268	}
	269
	270	/* This function definitely needs to be split up. Some fine day I'll
	271	* hopefully have the guts to do so. Until then: sorry for the mess.
	272	*/
	273
	274	static int affs_fill_super(struct super_block sb, void data, int silent)
	275	{
	276	struct affs_sb_info *sbi;
	277	struct buffer_head *root_bh = NULL;
	278	struct buffer_head *boot_bh;
	279	struct inode *root_inode = NULL;
	280	s32 root_block;
	281	int size, blocksize;
	282	u32 chksum;
	283	int num_bm;
	284	int i, j;
	285	s32 key;
	286	uid_t uid;
	287	gid_t gid;
	288	int reserved;
	289	unsigned long mount_flags;
	290	int tmp_flags; /* fix remount prototype... */
2b943cf0	291	u8 sig[4];
210f8559	292	int ret = -EINVAL;
1da177e4	293
e9b3961b MS	294	save_mount_options(sb, data);
e9b3961b MS	295
1da177e4 LT	296	pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
	297
	298	sb->s_magic = AFFS_SUPER_MAGIC;
	299	sb->s_op = &affs_sops;
	300	sb->s_flags \|= MS_NODIRATIME;
	301
f8314dc6	302	sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
1da177e4 LT	303	if (!sbi)
	304	return -ENOMEM;
	305	sb->s_fs_info = sbi;
7d135a5d	306	mutex_init(&sbi->s_bmlock);
29333920	307	spin_lock_init(&sbi->symlink_lock);
1da177e4 LT	308
	309	if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
	310	&blocksize,&sbi->s_prefix,
	311	sbi->s_volume, &mount_flags)) {
	312	printk(KERN_ERR "AFFS: Error parsing options\n");
afc70ed0 AV	313	kfree(sbi->s_prefix);
afc70ed0 AV	314	kfree(sbi);
1da177e4 LT	315	return -EINVAL;
	316	}
	317	/* N.B. after this point s_prefix must be released */
	318
	319	sbi->s_flags = mount_flags;
	320	sbi->s_mode = i;
	321	sbi->s_uid = uid;
	322	sbi->s_gid = gid;
	323	sbi->s_reserved= reserved;
	324
	325	/* Get the size of the device in 512-byte blocks.
	326	* If we later see that the partition uses bigger
	327	* blocks, we will have to change it.
	328	*/
	329
	330	size = sb->s_bdev->bd_inode->i_size >> 9;
	331	pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
	332
	333	affs_set_blocksize(sb, PAGE_SIZE);
	334	/* Try to find root block. Its location depends on the block size. */
	335
	336	i = 512;
	337	j = 4096;
	338	if (blocksize > 0) {
	339	i = j = blocksize;
	340	size = size / (blocksize / 512);
	341	}
	342	for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
	343	sbi->s_root_block = root_block;
	344	if (root_block < 0)
	345	sbi->s_root_block = (reserved + size - 1) / 2;
	346	pr_debug("AFFS: setting blocksize to %d\n", blocksize);
	347	affs_set_blocksize(sb, blocksize);
	348	sbi->s_partition_size = size;
	349
	350	/* The root block location that was calculated above is not
	351	* correct if the partition size is an odd number of 512-
	352	* byte blocks, which will be rounded down to a number of
	353	* 1024-byte blocks, and if there were an even number of
	354	* reserved blocks. Ideally, all partition checkers should
	355	* report the real number of blocks of the real blocksize,
	356	* but since this just cannot be done, we have to try to
	357	* find the root block anyways. In the above case, it is one
	358	* block behind the calculated one. So we check this one, too.
	359	*/
	360	for (num_bm = 0; num_bm < 2; num_bm++) {
	361	pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
	362	"size=%d, reserved=%d\n",
	363	sb->s_id,
	364	sbi->s_root_block + num_bm,
	365	blocksize, size, reserved);
	366	root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
	367	if (!root_bh)
	368	continue;
	369	if (!affs_checksum_block(sb, root_bh) &&
	370	be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
	371	be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
	372	sbi->s_hashsize = blocksize / 4 - 56;
	373	sbi->s_root_block += num_bm;
	374	key = 1;
	375	goto got_root;
	376	}
	377	affs_brelse(root_bh);
	378	root_bh = NULL;
379	}
380	}
381	if (!silent)
382	printk(KERN_ERR "AFFS: No valid root block on device %s\n",
383	sb->s_id);
384	goto out_error;
385
386	/* N.B. after this point bh must be released */
387	got_root:
388	root_block = sbi->s_root_block;
389
390	/* Find out which kind of FS we have */
391	boot_bh = sb_bread(sb, 0);
392	if (!boot_bh) {
393	printk(KERN_ERR "AFFS: Cannot read boot block\n");
394	goto out_error;
395	}
2b943cf0	396	memcpy(sig, boot_bh->b_data, 4);
1da177e4	397	brelse(boot_bh);
2b943cf0	398	chksum = be32_to_cpu((__be32 )sig);
1da177e4 LT	399
	400	/* Dircache filesystems are compatible with non-dircache ones
	401	* when reading. As long as they aren't supported, writing is
	402	* not recommended.
	403	*/
	404	if ((chksum == FS_DCFFS \|\| chksum == MUFS_DCFFS \|\| chksum == FS_DCOFS
	405	\|\| chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
	406	printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
	407	sb->s_id);
	408	sb->s_flags \|= MS_RDONLY;
	409	}
	410	switch (chksum) {
	411	case MUFS_FS:
	412	case MUFS_INTLFFS:
	413	case MUFS_DCFFS:
	414	sbi->s_flags \|= SF_MUFS;
	415	/* fall thru */
	416	case FS_INTLFFS:
	417	case FS_DCFFS:
	418	sbi->s_flags \|= SF_INTL;
	419	break;
	420	case MUFS_FFS:
	421	sbi->s_flags \|= SF_MUFS;
	422	break;
	423	case FS_FFS:
	424	break;
	425	case MUFS_OFS:
	426	sbi->s_flags \|= SF_MUFS;
	427	/* fall thru */
	428	case FS_OFS:
	429	sbi->s_flags \|= SF_OFS;
	430	sb->s_flags \|= MS_NOEXEC;
	431	break;
	432	case MUFS_DCOFS:
	433	case MUFS_INTLOFS:
	434	sbi->s_flags \|= SF_MUFS;
	435	case FS_DCOFS:
	436	case FS_INTLOFS:
	437	sbi->s_flags \|= SF_INTL \| SF_OFS;
	438	sb->s_flags \|= MS_NOEXEC;
	439	break;
	440	default:
	441	printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
	442	sb->s_id, chksum);
	443	goto out_error;
	444	}
	445
	446	if (mount_flags & SF_VERBOSE) {
2b943cf0 AV	447	u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
	448	printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
	449	len > 31 ? 31 : len,
1da177e4	450	AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
2b943cf0	451	sig, sig[3] + '0', blocksize);
1da177e4 LT	452	}
	453
	454	sb->s_flags \|= MS_NODEV \| MS_NOSUID;
	455
	456	sbi->s_data_blksize = sb->s_blocksize;
	457	if (sbi->s_flags & SF_OFS)
	458	sbi->s_data_blksize -= 24;
	459
	460	/* Keep super block in cache */
	461	sbi->s_root_bh = root_bh;
	462	/* N.B. after this point s_root_bh must be released */
	463
	464	tmp_flags = sb->s_flags;
	465	if (affs_init_bitmap(sb, &tmp_flags))
	466	goto out_error;
	467	sb->s_flags = tmp_flags;
	468
	469	/* set up enough so that it can read an inode */
	470
210f8559 DH	471	root_inode = affs_iget(sb, root_block);
	472	if (IS_ERR(root_inode)) {
	473	ret = PTR_ERR(root_inode);
	474	goto out_error_noinode;
	475	}
	476
1da177e4 LT	477	sb->s_root = d_alloc_root(root_inode);
	478	if (!sb->s_root) {
	479	printk(KERN_ERR "AFFS: Get root inode failed\n");
	480	goto out_error;
	481	}
	482	sb->s_root->d_op = &affs_dentry_operations;
	483
	484	pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
	485	return 0;
	486
	487	/*
	488	* Begin the cascaded cleanup ...
	489	*/
	490	out_error:
	491	if (root_inode)
	492	iput(root_inode);
210f8559	493	out_error_noinode:
f99d49ad	494	kfree(sbi->s_bitmap);
1da177e4	495	affs_brelse(root_bh);
f99d49ad	496	kfree(sbi->s_prefix);
1da177e4 LT	497	kfree(sbi);
1da177e4 LT	498	sb->s_fs_info = NULL;
210f8559	499	return ret;
1da177e4 LT	500	}
	501
	502	static int
	503	affs_remount(struct super_block sb, int flags, char *data)
	504	{
	505	struct affs_sb_info *sbi = AFFS_SB(sb);
	506	int blocksize;
	507	uid_t uid;
	508	gid_t gid;
	509	int mode;
	510	int reserved;
	511	int root_block;
	512	unsigned long mount_flags;
	513	int res = 0;
e9b3961b	514	char *new_opts = kstrdup(data, GFP_KERNEL);
29333920 AV	515	char volume[32];
29333920 AV	516	char *prefix = NULL;
1da177e4 LT	517
	518	pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
	519
	520	*flags \|= MS_NODIRATIME;
	521
29333920	522	memcpy(volume, sbi->s_volume, 32);
e9b3961b	523	if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
29333920	524	&blocksize, &prefix, volume,
e9b3961b	525	&mount_flags)) {
29333920	526	kfree(prefix);
e9b3961b	527	kfree(new_opts);
1da177e4	528	return -EINVAL;
e9b3961b	529	}
337eb00a	530	lock_kernel();
2a32cebd	531	replace_mount_options(sb, new_opts);
e9b3961b	532
1da177e4 LT	533	sbi->s_flags = mount_flags;
	534	sbi->s_mode = mode;
	535	sbi->s_uid = uid;
	536	sbi->s_gid = gid;
29333920 AV	537	/* protect against readers */
	538	spin_lock(&sbi->symlink_lock);
	539	if (prefix) {
	540	kfree(sbi->s_prefix);
	541	sbi->s_prefix = prefix;
	542	}
	543	memcpy(sbi->s_volume, volume, 32);
	544	spin_unlock(&sbi->symlink_lock);
1da177e4	545
337eb00a AIB	546	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
337eb00a AIB	547	unlock_kernel();
1da177e4	548	return 0;
337eb00a	549	}
1da177e4	550	if (*flags & MS_RDONLY) {
669d5f1f	551	affs_write_super(sb);
1da177e4 LT	552	affs_free_bitmap(sb);
	553	} else
	554	res = affs_init_bitmap(sb, flags);
	555
337eb00a	556	unlock_kernel();
1da177e4 LT	557	return res;
	558	}
	559
	560	static int
726c3342	561	affs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	562	{
726c3342	563	struct super_block *sb = dentry->d_sb;
1da177e4	564	int free;
a6a2a73c	565	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1da177e4 LT	566
	567	pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
	568	AFFS_SB(sb)->s_reserved);
	569
	570	free = affs_count_free_blocks(sb);
	571	buf->f_type = AFFS_SUPER_MAGIC;
	572	buf->f_bsize = sb->s_blocksize;
	573	buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
	574	buf->f_bfree = free;
	575	buf->f_bavail = free;
a6a2a73c CL	576	buf->f_fsid.val[0] = (u32)id;
	577	buf->f_fsid.val[1] = (u32)(id >> 32);
	578	buf->f_namelen = 30;
1da177e4 LT	579	return 0;
	580	}
	581
454e2398 DH	582	static int affs_get_sb(struct file_system_type *fs_type,
454e2398 DH	583	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	584	{
454e2398 DH	585	return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super,
454e2398 DH	586	mnt);
1da177e4 LT	587	}
	588
	589	static struct file_system_type affs_fs_type = {
	590	.owner = THIS_MODULE,
	591	.name = "affs",
	592	.get_sb = affs_get_sb,
	593	.kill_sb = kill_block_super,
	594	.fs_flags = FS_REQUIRES_DEV,
	595	};
	596
	597	static int __init init_affs_fs(void)
	598	{
	599	int err = init_inodecache();
	600	if (err)
	601	goto out1;
	602	err = register_filesystem(&affs_fs_type);
	603	if (err)
	604	goto out;
	605	return 0;
	606	out:
	607	destroy_inodecache();
	608	out1:
	609	return err;
	610	}
	611
	612	static void __exit exit_affs_fs(void)
	613	{
	614	unregister_filesystem(&affs_fs_type);
	615	destroy_inodecache();
	616	}
	617
	618	MODULE_DESCRIPTION("Amiga filesystem support for Linux");
	619	MODULE_LICENSE("GPL");
	620
	621	module_init(init_affs_fs)
	622	module_exit(exit_affs_fs)