[mirror_ubuntu-bionic-kernel.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)
{
	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);

	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");

	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);
	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);
	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_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
}

static void affs_destroy_inode(struct inode *inode)
{
	call_rcu(&inode->i_rcu, affs_i_callback);
}

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;
	}

	if (AFFS_SB(sb)->s_flags & SF_INTL)
		sb->s_d_op = &affs_intl_dentry_operations;
	else
		sb->s_d_op = &affs_dentry_operations;

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

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

	/*
	 * Begin the cascaded cleanup ...
	 */
out_error:
	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
bc86256d	28	affs_commit_super(struct super_block *sb, int wait)
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
e2896436 CH	34	secs_to_datestamp(get_seconds(), &tail->disk_change);
	35	affs_fix_checksum(sb, bh);
	36	mark_buffer_dirty(bh);
7435d506 AB	37	if (wait)
7435d506 AB	38	sync_dirty_buffer(bh);
e2896436 CH	39	}
e2896436 CH	40
1da177e4 LT	41	static void
	42	affs_put_super(struct super_block *sb)
	43	{
	44	struct affs_sb_info *sbi = AFFS_SB(sb);
	45	pr_debug("AFFS: put_super()\n");
	46
f99d49ad	47	kfree(sbi->s_prefix);
1da177e4 LT	48	affs_free_bitmap(sb);
	49	affs_brelse(sbi->s_root_bh);
	50	kfree(sbi);
	51	sb->s_fs_info = NULL;
1da177e4 LT	52	}
	53
	54	static void
	55	affs_write_super(struct super_block *sb)
	56	{
ebc1ac16	57	lock_super(sb);
669d5f1f	58	if (!(sb->s_flags & MS_RDONLY))
bc86256d	59	affs_commit_super(sb, 1);
669d5f1f	60	sb->s_dirt = 0;
ebc1ac16	61	unlock_super(sb);
1da177e4	62
669d5f1f	63	pr_debug("AFFS: write_super() at %lu, clean=2\n", get_seconds());
1da177e4 LT	64	}
1da177e4 LT	65
e2896436 CH	66	static int
	67	affs_sync_fs(struct super_block *sb, int wait)
	68	{
	69	lock_super(sb);
bc86256d	70	affs_commit_super(sb, wait);
e2896436 CH	71	sb->s_dirt = 0;
	72	unlock_super(sb);
	73	return 0;
	74	}
	75
e18b890b	76	static struct kmem_cache * affs_inode_cachep;
1da177e4 LT	77
	78	static struct inode affs_alloc_inode(struct super_block sb)
	79	{
dca3c336 RZ	80	struct affs_inode_info *i;
	81
	82	i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
	83	if (!i)
1da177e4	84	return NULL;
dca3c336 RZ	85
	86	i->vfs_inode.i_version = 1;
	87	i->i_lc = NULL;
	88	i->i_ext_bh = NULL;
	89	i->i_pa_cnt = 0;
	90
	91	return &i->vfs_inode;
1da177e4 LT	92	}
1da177e4 LT	93
fa0d7e3d	94	static void affs_i_callback(struct rcu_head *head)
1da177e4	95	{
fa0d7e3d	96	struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4 LT	97	kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
	98	}
	99
fa0d7e3d NP	100	static void affs_destroy_inode(struct inode *inode)
	101	{
	102	call_rcu(&inode->i_rcu, affs_i_callback);
	103	}
	104
51cc5068	105	static void init_once(void *foo)
1da177e4 LT	106	{
	107	struct affs_inode_info ei = (struct affs_inode_info ) foo;
	108
756b0322 TG	109	sema_init(&ei->i_link_lock, 1);
756b0322 TG	110	sema_init(&ei->i_ext_lock, 1);
a35afb83	111	inode_init_once(&ei->vfs_inode);
1da177e4 LT	112	}
	113
	114	static int init_inodecache(void)
	115	{
	116	affs_inode_cachep = kmem_cache_create("affs_inode_cache",
	117	sizeof(struct affs_inode_info),
fffb60f9 PJ	118	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	119	SLAB_MEM_SPREAD),
20c2df83	120	init_once);
1da177e4 LT	121	if (affs_inode_cachep == NULL)
	122	return -ENOMEM;
	123	return 0;
	124	}
	125
	126	static void destroy_inodecache(void)
	127	{
1a1d92c1	128	kmem_cache_destroy(affs_inode_cachep);
1da177e4 LT	129	}
1da177e4 LT	130
ee9b6d61	131	static const struct super_operations affs_sops = {
1da177e4 LT	132	.alloc_inode = affs_alloc_inode,
1da177e4 LT	133	.destroy_inode = affs_destroy_inode,
1da177e4	134	.write_inode = affs_write_inode,
f053ddde	135	.evict_inode = affs_evict_inode,
1da177e4 LT	136	.put_super = affs_put_super,
1da177e4 LT	137	.write_super = affs_write_super,
e2896436	138	.sync_fs = affs_sync_fs,
1da177e4 LT	139	.statfs = affs_statfs,
1da177e4 LT	140	.remount_fs = affs_remount,
e9b3961b	141	.show_options = generic_show_options,
1da177e4 LT	142	};
	143
	144	enum {
	145	Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
	146	Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
	147	Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
	148	};
	149
a447c093	150	static const match_table_t tokens = {
1da177e4 LT	151	{Opt_bs, "bs=%u"},
	152	{Opt_mode, "mode=%o"},
	153	{Opt_mufs, "mufs"},
	154	{Opt_prefix, "prefix=%s"},
	155	{Opt_protect, "protect"},
	156	{Opt_reserved, "reserved=%u"},
	157	{Opt_root, "root=%u"},
	158	{Opt_setgid, "setgid=%u"},
	159	{Opt_setuid, "setuid=%u"},
	160	{Opt_verbose, "verbose"},
	161	{Opt_volume, "volume=%s"},
	162	{Opt_ignore, "grpquota"},
	163	{Opt_ignore, "noquota"},
	164	{Opt_ignore, "quota"},
	165	{Opt_ignore, "usrquota"},
	166	{Opt_err, NULL},
	167	};
	168
	169	static int
	170	parse_options(char options, uid_t uid, gid_t gid, int mode, int reserved, s32 root,
	171	int blocksize, char prefix, char volume, unsigned long *mount_opts)
	172	{
	173	char *p;
	174	substring_t args[MAX_OPT_ARGS];
	175
	176	/* Fill in defaults */
	177
21559981 DH	178	*uid = current_uid();
21559981 DH	179	*gid = current_gid();
1da177e4 LT	180	*reserved = 2;
	181	*root = -1;
	182	*blocksize = -1;
	183	volume[0] = ':';
	184	volume[1] = 0;
	185	*mount_opts = 0;
	186	if (!options)
	187	return 1;
	188
	189	while ((p = strsep(&options, ",")) != NULL) {
	190	int token, n, option;
	191	if (!*p)
	192	continue;
	193
	194	token = match_token(p, tokens, args);
	195	switch (token) {
	196	case Opt_bs:
	197	if (match_int(&args[0], &n))
217686e9	198	return 0;
1da177e4 LT	199	if (n != 512 && n != 1024 && n != 2048
	200	&& n != 4096) {
	201	printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
	202	return 0;
	203	}
	204	*blocksize = n;
	205	break;
	206	case Opt_mode:
	207	if (match_octal(&args[0], &option))
217686e9	208	return 0;
1da177e4 LT	209	*mode = option & 0777;
	210	*mount_opts \|= SF_SETMODE;
	211	break;
	212	case Opt_mufs:
	213	*mount_opts \|= SF_MUFS;
	214	break;
	215	case Opt_prefix:
1da177e4 LT	216	*prefix = match_strdup(&args[0]);
	217	if (!*prefix)
	218	return 0;
	219	*mount_opts \|= SF_PREFIX;
	220	break;
	221	case Opt_protect:
	222	*mount_opts \|= SF_IMMUTABLE;
	223	break;
	224	case Opt_reserved:
	225	if (match_int(&args[0], reserved))
217686e9	226	return 0;
1da177e4 LT	227	break;
	228	case Opt_root:
	229	if (match_int(&args[0], root))
217686e9	230	return 0;
1da177e4 LT	231	break;
	232	case Opt_setgid:
	233	if (match_int(&args[0], &option))
217686e9	234	return 0;
1da177e4 LT	235	*gid = option;
	236	*mount_opts \|= SF_SETGID;
	237	break;
	238	case Opt_setuid:
	239	if (match_int(&args[0], &option))
217686e9	240	return 0;
1da177e4 LT	241	*uid = option;
	242	*mount_opts \|= SF_SETUID;
	243	break;
	244	case Opt_verbose:
	245	*mount_opts \|= SF_VERBOSE;
	246	break;
	247	case Opt_volume: {
	248	char *vol = match_strdup(&args[0]);
6db27dd9 JM	249	if (!vol)
6db27dd9 JM	250	return 0;
1da177e4 LT	251	strlcpy(volume, vol, 32);
	252	kfree(vol);
	253	break;
	254	}
	255	case Opt_ignore:
	256	/* Silently ignore the quota options */
	257	break;
	258	default:
	259	printk("AFFS: Unrecognized mount option \"%s\" "
	260	"or missing value\n", p);
	261	return 0;
	262	}
	263	}
	264	return 1;
	265	}
	266
	267	/* This function definitely needs to be split up. Some fine day I'll
	268	* hopefully have the guts to do so. Until then: sorry for the mess.
	269	*/
	270
	271	static int affs_fill_super(struct super_block sb, void data, int silent)
	272	{
	273	struct affs_sb_info *sbi;
	274	struct buffer_head *root_bh = NULL;
	275	struct buffer_head *boot_bh;
	276	struct inode *root_inode = NULL;
	277	s32 root_block;
	278	int size, blocksize;
	279	u32 chksum;
	280	int num_bm;
	281	int i, j;
	282	s32 key;
	283	uid_t uid;
	284	gid_t gid;
	285	int reserved;
	286	unsigned long mount_flags;
	287	int tmp_flags; /* fix remount prototype... */
2b943cf0	288	u8 sig[4];
210f8559	289	int ret = -EINVAL;
1da177e4	290
e9b3961b MS	291	save_mount_options(sb, data);
e9b3961b MS	292
1da177e4 LT	293	pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
	294
	295	sb->s_magic = AFFS_SUPER_MAGIC;
	296	sb->s_op = &affs_sops;
	297	sb->s_flags \|= MS_NODIRATIME;
	298
f8314dc6	299	sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
1da177e4 LT	300	if (!sbi)
1da177e4 LT	301	return -ENOMEM;
74c41429	302
1da177e4	303	sb->s_fs_info = sbi;
7d135a5d	304	mutex_init(&sbi->s_bmlock);
29333920	305	spin_lock_init(&sbi->symlink_lock);
1da177e4 LT	306
	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");
afc70ed0 AV	311	kfree(sbi->s_prefix);
afc70ed0 AV	312	kfree(sbi);
1da177e4 LT	313	return -EINVAL;
	314	}
	315	/* N.B. after this point s_prefix must be released */
	316
	317	sbi->s_flags = mount_flags;
	318	sbi->s_mode = i;
	319	sbi->s_uid = uid;
	320	sbi->s_gid = gid;
	321	sbi->s_reserved= reserved;
	322
	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.
	326	*/
	327
	328	size = sb->s_bdev->bd_inode->i_size >> 9;
	329	pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
	330
	331	affs_set_blocksize(sb, PAGE_SIZE);
	332	/* Try to find root block. Its location depends on the block size. */
	333
	334	i = 512;
	335	j = 4096;
	336	if (blocksize > 0) {
	337	i = j = blocksize;
	338	size = size / (blocksize / 512);
	339	}
	340	for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
	341	sbi->s_root_block = root_block;
	342	if (root_block < 0)
	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;
	347
	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.
	357	*/
	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",
	361	sb->s_id,
	362	sbi->s_root_block + num_bm,
	363	blocksize, size, reserved);
	364	root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
	365	if (!root_bh)
	366	continue;
	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;
	372	key = 1;
	373	goto got_root;
	374	}
	375	affs_brelse(root_bh);
	376	root_bh = NULL;
377	}
378	}
379	if (!silent)
380	printk(KERN_ERR "AFFS: No valid root block on device %s\n",
381	sb->s_id);
382	goto out_error;
383
384	/* N.B. after this point bh must be released */
385	got_root:
386	root_block = sbi->s_root_block;
387
388	/* Find out which kind of FS we have */
389	boot_bh = sb_bread(sb, 0);
390	if (!boot_bh) {
391	printk(KERN_ERR "AFFS: Cannot read boot block\n");
392	goto out_error;
393	}
2b943cf0	394	memcpy(sig, boot_bh->b_data, 4);
1da177e4	395	brelse(boot_bh);
2b943cf0	396	chksum = be32_to_cpu((__be32 )sig);
1da177e4 LT	397
	398	/* Dircache filesystems are compatible with non-dircache ones
	399	* when reading. As long as they aren't supported, writing is
	400	* not recommended.
	401	*/
	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",
	405	sb->s_id);
	406	sb->s_flags \|= MS_RDONLY;
	407	}
	408	switch (chksum) {
	409	case MUFS_FS:
	410	case MUFS_INTLFFS:
	411	case MUFS_DCFFS:
	412	sbi->s_flags \|= SF_MUFS;
	413	/* fall thru */
	414	case FS_INTLFFS:
	415	case FS_DCFFS:
	416	sbi->s_flags \|= SF_INTL;
	417	break;
	418	case MUFS_FFS:
	419	sbi->s_flags \|= SF_MUFS;
	420	break;
	421	case FS_FFS:
	422	break;
	423	case MUFS_OFS:
	424	sbi->s_flags \|= SF_MUFS;
	425	/* fall thru */
	426	case FS_OFS:
	427	sbi->s_flags \|= SF_OFS;
	428	sb->s_flags \|= MS_NOEXEC;
	429	break;
	430	case MUFS_DCOFS:
	431	case MUFS_INTLOFS:
	432	sbi->s_flags \|= SF_MUFS;
	433	case FS_DCOFS:
	434	case FS_INTLOFS:
	435	sbi->s_flags \|= SF_INTL \| SF_OFS;
	436	sb->s_flags \|= MS_NOEXEC;
	437	break;
	438	default:
	439	printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
	440	sb->s_id, chksum);
	441	goto out_error;
	442	}
	443
	444	if (mount_flags & SF_VERBOSE) {
2b943cf0 AV	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",
	447	len > 31 ? 31 : len,
1da177e4	448	AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
2b943cf0	449	sig, sig[3] + '0', blocksize);
1da177e4 LT	450	}
	451
	452	sb->s_flags \|= MS_NODEV \| MS_NOSUID;
	453
	454	sbi->s_data_blksize = sb->s_blocksize;
	455	if (sbi->s_flags & SF_OFS)
	456	sbi->s_data_blksize -= 24;
	457
	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 */
	461
	462	tmp_flags = sb->s_flags;
	463	if (affs_init_bitmap(sb, &tmp_flags))
	464	goto out_error;
	465	sb->s_flags = tmp_flags;
	466
	467	/* set up enough so that it can read an inode */
	468
210f8559 DH	469	root_inode = affs_iget(sb, root_block);
	470	if (IS_ERR(root_inode)) {
	471	ret = PTR_ERR(root_inode);
48fde701	472	goto out_error;
210f8559 DH	473	}
210f8559 DH	474
a129880d AV	475	if (AFFS_SB(sb)->s_flags & SF_INTL)
	476	sb->s_d_op = &affs_intl_dentry_operations;
	477	else
	478	sb->s_d_op = &affs_dentry_operations;
	479
48fde701	480	sb->s_root = d_make_root(root_inode);
1da177e4 LT	481	if (!sb->s_root) {
	482	printk(KERN_ERR "AFFS: Get root inode failed\n");
	483	goto out_error;
	484	}
1da177e4 LT	485
	486	pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
	487	return 0;
	488
	489	/*
	490	* Begin the cascaded cleanup ...
	491	*/
	492	out_error:
f99d49ad	493	kfree(sbi->s_bitmap);
1da177e4	494	affs_brelse(root_bh);
f99d49ad	495	kfree(sbi->s_prefix);
1da177e4 LT	496	kfree(sbi);
1da177e4 LT	497	sb->s_fs_info = NULL;
210f8559	498	return ret;
1da177e4 LT	499	}
	500
	501	static int
	502	affs_remount(struct super_block sb, int flags, char *data)
	503	{
	504	struct affs_sb_info *sbi = AFFS_SB(sb);
	505	int blocksize;
	506	uid_t uid;
	507	gid_t gid;
	508	int mode;
	509	int reserved;
	510	int root_block;
	511	unsigned long mount_flags;
	512	int res = 0;
e9b3961b	513	char *new_opts = kstrdup(data, GFP_KERNEL);
29333920 AV	514	char volume[32];
29333920 AV	515	char *prefix = NULL;
1da177e4 LT	516
	517	pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
	518
	519	*flags \|= MS_NODIRATIME;
	520
29333920	521	memcpy(volume, sbi->s_volume, 32);
e9b3961b	522	if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
29333920	523	&blocksize, &prefix, volume,
e9b3961b	524	&mount_flags)) {
29333920	525	kfree(prefix);
e9b3961b	526	kfree(new_opts);
1da177e4	527	return -EINVAL;
e9b3961b	528	}
74c41429	529
2a32cebd	530	replace_mount_options(sb, new_opts);
e9b3961b	531
1da177e4 LT	532	sbi->s_flags = mount_flags;
	533	sbi->s_mode = mode;
	534	sbi->s_uid = uid;
	535	sbi->s_gid = gid;
29333920 AV	536	/* protect against readers */
	537	spin_lock(&sbi->symlink_lock);
	538	if (prefix) {
	539	kfree(sbi->s_prefix);
	540	sbi->s_prefix = prefix;
	541	}
	542	memcpy(sbi->s_volume, volume, 32);
	543	spin_unlock(&sbi->symlink_lock);
1da177e4	544
74c41429	545	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
1da177e4	546	return 0;
74c41429	547
1da177e4	548	if (*flags & MS_RDONLY) {
669d5f1f	549	affs_write_super(sb);
1da177e4 LT	550	affs_free_bitmap(sb);
	551	} else
	552	res = affs_init_bitmap(sb, flags);
	553
	554	return res;
	555	}
	556
	557	static int
726c3342	558	affs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	559	{
726c3342	560	struct super_block *sb = dentry->d_sb;
1da177e4	561	int free;
a6a2a73c	562	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1da177e4 LT	563
	564	pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
	565	AFFS_SB(sb)->s_reserved);
	566
	567	free = affs_count_free_blocks(sb);
	568	buf->f_type = AFFS_SUPER_MAGIC;
	569	buf->f_bsize = sb->s_blocksize;
	570	buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
	571	buf->f_bfree = free;
	572	buf->f_bavail = free;
a6a2a73c CL	573	buf->f_fsid.val[0] = (u32)id;
	574	buf->f_fsid.val[1] = (u32)(id >> 32);
	575	buf->f_namelen = 30;
1da177e4 LT	576	return 0;
	577	}
	578
152a0836 AV	579	static struct dentry affs_mount(struct file_system_type fs_type,
152a0836 AV	580	int flags, const char dev_name, void data)
1da177e4	581	{
152a0836	582	return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
1da177e4 LT	583	}
	584
	585	static struct file_system_type affs_fs_type = {
	586	.owner = THIS_MODULE,
	587	.name = "affs",
152a0836	588	.mount = affs_mount,
1da177e4 LT	589	.kill_sb = kill_block_super,
	590	.fs_flags = FS_REQUIRES_DEV,
	591	};
	592
	593	static int __init init_affs_fs(void)
	594	{
	595	int err = init_inodecache();
	596	if (err)
	597	goto out1;
	598	err = register_filesystem(&affs_fs_type);
	599	if (err)
	600	goto out;
	601	return 0;
	602	out:
	603	destroy_inodecache();
	604	out1:
	605	return err;
	606	}
	607
	608	static void __exit exit_affs_fs(void)
	609	{
	610	unregister_filesystem(&affs_fs_type);
	611	destroy_inodecache();
	612	}
	613
	614	MODULE_DESCRIPTION("Amiga filesystem support for Linux");
	615	MODULE_LICENSE("GPL");
	616
	617	module_init(init_affs_fs)
	618	module_exit(exit_affs_fs)