[linux-2.6-block.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 <linux/writeback.h>
#include <linux/blkdev.h>
#include "affs.h"

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);

	lock_buffer(bh);
	secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change);
	affs_fix_checksum(sb, bh);
	unlock_buffer(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("%s()\n", __func__);

	cancel_delayed_work_sync(&sbi->sb_work);
}

static int
affs_sync_fs(struct super_block *sb, int wait)
{
	affs_commit_super(sb, wait);
	return 0;
}

static void flush_superblock(struct work_struct *work)
{
	struct affs_sb_info *sbi;
	struct super_block *sb;

	sbi = container_of(work, struct affs_sb_info, sb_work.work);
	sb = sbi->sb;

	spin_lock(&sbi->work_lock);
	sbi->work_queued = 0;
	spin_unlock(&sbi->work_lock);

	affs_commit_super(sb, 1);
}

void affs_mark_sb_dirty(struct super_block *sb)
{
	struct affs_sb_info *sbi = AFFS_SB(sb);
	unsigned long delay;

	if (sb->s_flags & MS_RDONLY)
	       return;

	spin_lock(&sbi->work_lock);
	if (!sbi->work_queued) {
	       delay = msecs_to_jiffies(dirty_writeback_interval * 10);
	       queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
	       sbi->work_queued = 1;
	}
	spin_unlock(&sbi->work_lock);
}

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

static void destroy_inodecache(void)
{
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
	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,
	.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_notruncate, 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_notruncate, "nofilenametruncate"},
	{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, kuid_t *uid, kgid_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) {
				pr_warn("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;
			affs_set_opt(*mount_opts, SF_SETMODE);
			break;
		case Opt_mufs:
			affs_set_opt(*mount_opts, SF_MUFS);
			break;
		case Opt_notruncate:
			affs_set_opt(*mount_opts, SF_NO_TRUNCATE);
			break;
		case Opt_prefix:
			*prefix = match_strdup(&args[0]);
			if (!*prefix)
				return 0;
			affs_set_opt(*mount_opts, SF_PREFIX);
			break;
		case Opt_protect:
			affs_set_opt(*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 = make_kgid(current_user_ns(), option);
			if (!gid_valid(*gid))
				return 0;
			affs_set_opt(*mount_opts, SF_SETGID);
			break;
		case Opt_setuid:
			if (match_int(&args[0], &option))
				return 0;
			*uid = make_kuid(current_user_ns(), option);
			if (!uid_valid(*uid))
				return 0;
			affs_set_opt(*mount_opts, SF_SETUID);
			break;
		case Opt_verbose:
			affs_set_opt(*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:
			pr_warn("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;
	kuid_t			 uid;
	kgid_t			 gid;
	int			 reserved;
	unsigned long		 mount_flags;
	int			 tmp_flags;	/* fix remount prototype... */
	u8			 sig[4];
	int			 ret;

	save_mount_options(sb, data);

	pr_debug("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;
	sbi->sb = sb;
	mutex_init(&sbi->s_bmlock);
	spin_lock_init(&sbi->symlink_lock);
	spin_lock_init(&sbi->work_lock);
	INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);

	if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
				&blocksize,&sbi->s_prefix,
				sbi->s_volume, &mount_flags)) {
		pr_err("Error parsing options\n");
		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 = i_size_read(sb->s_bdev->bd_inode) >> 9;
	pr_debug("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 = bdev_logical_block_size(sb->s_bdev);
	j = PAGE_SIZE;
	if (blocksize > 0) {
		i = j = blocksize;
		size = size / (blocksize / 512);
	}

	for (blocksize = i; 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("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("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;
				goto got_root;
			}
			affs_brelse(root_bh);
			root_bh = NULL;
		}
	}
	if (!silent)
		pr_err("No valid root block on device %s\n", sb->s_id);
	return -EINVAL;

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

	/* Find out which kind of FS we have */
	boot_bh = sb_bread(sb, 0);
	if (!boot_bh) {
		pr_err("Cannot read boot block\n");
		return -EINVAL;
	}
	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)) {
		pr_notice("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:
		affs_set_opt(sbi->s_flags, SF_MUFS);
		/* fall thru */
	case FS_INTLFFS:
	case FS_DCFFS:
		affs_set_opt(sbi->s_flags, SF_INTL);
		break;
	case MUFS_FFS:
		affs_set_opt(sbi->s_flags, SF_MUFS);
		break;
	case FS_FFS:
		break;
	case MUFS_OFS:
		affs_set_opt(sbi->s_flags, SF_MUFS);
		/* fall thru */
	case FS_OFS:
		affs_set_opt(sbi->s_flags, SF_OFS);
		sb->s_flags |= MS_NOEXEC;
		break;
	case MUFS_DCOFS:
	case MUFS_INTLOFS:
		affs_set_opt(sbi->s_flags, SF_MUFS);
	case FS_DCOFS:
	case FS_INTLOFS:
		affs_set_opt(sbi->s_flags, SF_INTL);
		affs_set_opt(sbi->s_flags, SF_OFS);
		sb->s_flags |= MS_NOEXEC;
		break;
	default:
		pr_err("Unknown filesystem on device %s: %08X\n",
		       sb->s_id, chksum);
		return -EINVAL;
	}

	if (affs_test_opt(mount_flags, SF_VERBOSE)) {
		u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
		pr_notice("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 (affs_test_opt(sbi->s_flags, SF_OFS))
		sbi->s_data_blksize -= 24;

	tmp_flags = sb->s_flags;
	ret = affs_init_bitmap(sb, &tmp_flags);
	if (ret)
		return ret;
	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))
		return PTR_ERR(root_inode);

	if (affs_test_opt(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) {
		pr_err("AFFS: Get root inode failed\n");
		return -ENOMEM;
	}

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

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

	new_opts = kstrdup(data, GFP_KERNEL);
	if (!new_opts)
		return -ENOMEM;

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

	sync_filesystem(sb);
	*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;
	}

	flush_delayed_work(&sbi->sb_work);
	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_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("%s() partsize=%d, reserved=%d\n",
		 __func__, 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 = AFFSNAMEMAX;
	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 void affs_kill_sb(struct super_block *sb)
{
	struct affs_sb_info *sbi = AFFS_SB(sb);
	kill_block_super(sb);
	if (sbi) {
		affs_free_bitmap(sb);
		affs_brelse(sbi->s_root_bh);
		kfree(sbi->s_prefix);
		mutex_destroy(&sbi->s_bmlock);
		kfree(sbi);
	}
}

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

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>
3dd84782	20	#include <linux/writeback.h>
e852d82a	21	#include <linux/blkdev.h>
1da177e4 LT	22	#include "affs.h"
1da177e4 LT	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
a8371074	34	lock_buffer(bh);
db39c167	35	secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change);
e2896436	36	affs_fix_checksum(sb, bh);
a8371074 AB	37	unlock_buffer(bh);
a8371074 AB	38
e2896436	39	mark_buffer_dirty(bh);
7435d506 AB	40	if (wait)
7435d506 AB	41	sync_dirty_buffer(bh);
e2896436 CH	42	}
e2896436 CH	43
1da177e4 LT	44	static void
	45	affs_put_super(struct super_block *sb)
	46	{
	47	struct affs_sb_info *sbi = AFFS_SB(sb);
9606d9aa	48	pr_debug("%s()\n", __func__);
1da177e4	49
3dd84782	50	cancel_delayed_work_sync(&sbi->sb_work);
1da177e4 LT	51	}
1da177e4 LT	52
e2896436 CH	53	static int
	54	affs_sync_fs(struct super_block *sb, int wait)
	55	{
bc86256d	56	affs_commit_super(sb, wait);
e2896436 CH	57	return 0;
	58	}
	59
3dd84782 AB	60	static void flush_superblock(struct work_struct *work)
	61	{
	62	struct affs_sb_info *sbi;
	63	struct super_block *sb;
	64
	65	sbi = container_of(work, struct affs_sb_info, sb_work.work);
	66	sb = sbi->sb;
	67
	68	spin_lock(&sbi->work_lock);
	69	sbi->work_queued = 0;
	70	spin_unlock(&sbi->work_lock);
	71
	72	affs_commit_super(sb, 1);
	73	}
	74
	75	void affs_mark_sb_dirty(struct super_block *sb)
	76	{
	77	struct affs_sb_info *sbi = AFFS_SB(sb);
	78	unsigned long delay;
	79
	80	if (sb->s_flags & MS_RDONLY)
	81	return;
	82
	83	spin_lock(&sbi->work_lock);
	84	if (!sbi->work_queued) {
	85	delay = msecs_to_jiffies(dirty_writeback_interval * 10);
	86	queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
	87	sbi->work_queued = 1;
	88	}
	89	spin_unlock(&sbi->work_lock);
	90	}
	91
e18b890b	92	static struct kmem_cache * affs_inode_cachep;
1da177e4 LT	93
	94	static struct inode affs_alloc_inode(struct super_block sb)
	95	{
dca3c336 RZ	96	struct affs_inode_info *i;
	97
	98	i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
	99	if (!i)
1da177e4	100	return NULL;
dca3c336 RZ	101
	102	i->vfs_inode.i_version = 1;
	103	i->i_lc = NULL;
	104	i->i_ext_bh = NULL;
	105	i->i_pa_cnt = 0;
	106
	107	return &i->vfs_inode;
1da177e4 LT	108	}
1da177e4 LT	109
fa0d7e3d	110	static void affs_i_callback(struct rcu_head *head)
1da177e4	111	{
fa0d7e3d	112	struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4 LT	113	kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
	114	}
	115
fa0d7e3d NP	116	static void affs_destroy_inode(struct inode *inode)
	117	{
	118	call_rcu(&inode->i_rcu, affs_i_callback);
	119	}
	120
51cc5068	121	static void init_once(void *foo)
1da177e4 LT	122	{
	123	struct affs_inode_info ei = (struct affs_inode_info ) foo;
	124
756b0322 TG	125	sema_init(&ei->i_link_lock, 1);
756b0322 TG	126	sema_init(&ei->i_ext_lock, 1);
a35afb83	127	inode_init_once(&ei->vfs_inode);
1da177e4 LT	128	}
1da177e4 LT	129
adbd319e	130	static int __init init_inodecache(void)
1da177e4 LT	131	{
	132	affs_inode_cachep = kmem_cache_create("affs_inode_cache",
	133	sizeof(struct affs_inode_info),
fffb60f9	134	0, (SLAB_RECLAIM_ACCOUNT\|
5d097056	135	SLAB_MEM_SPREAD\|SLAB_ACCOUNT),
20c2df83	136	init_once);
1da177e4 LT	137	if (affs_inode_cachep == NULL)
	138	return -ENOMEM;
	139	return 0;
	140	}
	141
	142	static void destroy_inodecache(void)
	143	{
8c0a8537 KS	144	/*
	145	* Make sure all delayed rcu free inodes are flushed before we
	146	* destroy cache.
	147	*/
	148	rcu_barrier();
1a1d92c1	149	kmem_cache_destroy(affs_inode_cachep);
1da177e4 LT	150	}
1da177e4 LT	151
ee9b6d61	152	static const struct super_operations affs_sops = {
1da177e4 LT	153	.alloc_inode = affs_alloc_inode,
1da177e4 LT	154	.destroy_inode = affs_destroy_inode,
1da177e4	155	.write_inode = affs_write_inode,
f053ddde	156	.evict_inode = affs_evict_inode,
1da177e4	157	.put_super = affs_put_super,
e2896436	158	.sync_fs = affs_sync_fs,
1da177e4 LT	159	.statfs = affs_statfs,
1da177e4 LT	160	.remount_fs = affs_remount,
e9b3961b	161	.show_options = generic_show_options,
1da177e4 LT	162	};
	163
	164	enum {
8ca57722	165	Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect,
1da177e4 LT	166	Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
	167	Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
	168	};
	169
a447c093	170	static const match_table_t tokens = {
1da177e4 LT	171	{Opt_bs, "bs=%u"},
	172	{Opt_mode, "mode=%o"},
	173	{Opt_mufs, "mufs"},
8ca57722	174	{Opt_notruncate, "nofilenametruncate"},
1da177e4 LT	175	{Opt_prefix, "prefix=%s"},
	176	{Opt_protect, "protect"},
	177	{Opt_reserved, "reserved=%u"},
	178	{Opt_root, "root=%u"},
	179	{Opt_setgid, "setgid=%u"},
	180	{Opt_setuid, "setuid=%u"},
	181	{Opt_verbose, "verbose"},
	182	{Opt_volume, "volume=%s"},
	183	{Opt_ignore, "grpquota"},
	184	{Opt_ignore, "noquota"},
	185	{Opt_ignore, "quota"},
	186	{Opt_ignore, "usrquota"},
	187	{Opt_err, NULL},
	188	};
	189
	190	static int
8fed10be	191	parse_options(char options, kuid_t uid, kgid_t gid, int mode, int reserved, s32 root,
1da177e4 LT	192	int blocksize, char prefix, char volume, unsigned long *mount_opts)
	193	{
	194	char *p;
	195	substring_t args[MAX_OPT_ARGS];
	196
	197	/* Fill in defaults */
	198
21559981 DH	199	*uid = current_uid();
21559981 DH	200	*gid = current_gid();
1da177e4 LT	201	*reserved = 2;
	202	*root = -1;
	203	*blocksize = -1;
	204	volume[0] = ':';
	205	volume[1] = 0;
	206	*mount_opts = 0;
	207	if (!options)
	208	return 1;
	209
	210	while ((p = strsep(&options, ",")) != NULL) {
	211	int token, n, option;
	212	if (!*p)
	213	continue;
	214
	215	token = match_token(p, tokens, args);
	216	switch (token) {
	217	case Opt_bs:
	218	if (match_int(&args[0], &n))
217686e9	219	return 0;
1da177e4 LT	220	if (n != 512 && n != 1024 && n != 2048
1da177e4 LT	221	&& n != 4096) {
0158de12	222	pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
1da177e4 LT	223	return 0;
	224	}
	225	*blocksize = n;
	226	break;
	227	case Opt_mode:
	228	if (match_octal(&args[0], &option))
217686e9	229	return 0;
1da177e4	230	*mode = option & 0777;
34f24835	231	affs_set_opt(*mount_opts, SF_SETMODE);
1da177e4 LT	232	break;
1da177e4 LT	233	case Opt_mufs:
34f24835	234	affs_set_opt(*mount_opts, SF_MUFS);
1da177e4	235	break;
8ca57722	236	case Opt_notruncate:
34f24835	237	affs_set_opt(*mount_opts, SF_NO_TRUNCATE);
8ca57722	238	break;
1da177e4	239	case Opt_prefix:
1da177e4 LT	240	*prefix = match_strdup(&args[0]);
	241	if (!*prefix)
	242	return 0;
34f24835	243	affs_set_opt(*mount_opts, SF_PREFIX);
1da177e4 LT	244	break;
1da177e4 LT	245	case Opt_protect:
34f24835	246	affs_set_opt(*mount_opts, SF_IMMUTABLE);
1da177e4 LT	247	break;
	248	case Opt_reserved:
	249	if (match_int(&args[0], reserved))
217686e9	250	return 0;
1da177e4 LT	251	break;
	252	case Opt_root:
	253	if (match_int(&args[0], root))
217686e9	254	return 0;
1da177e4 LT	255	break;
	256	case Opt_setgid:
	257	if (match_int(&args[0], &option))
217686e9	258	return 0;
8fed10be EB	259	*gid = make_kgid(current_user_ns(), option);
	260	if (!gid_valid(*gid))
	261	return 0;
34f24835	262	affs_set_opt(*mount_opts, SF_SETGID);
1da177e4 LT	263	break;
	264	case Opt_setuid:
	265	if (match_int(&args[0], &option))
217686e9	266	return 0;
8fed10be EB	267	*uid = make_kuid(current_user_ns(), option);
	268	if (!uid_valid(*uid))
	269	return 0;
34f24835	270	affs_set_opt(*mount_opts, SF_SETUID);
1da177e4 LT	271	break;
1da177e4 LT	272	case Opt_verbose:
34f24835	273	affs_set_opt(*mount_opts, SF_VERBOSE);
1da177e4 LT	274	break;
	275	case Opt_volume: {
	276	char *vol = match_strdup(&args[0]);
6db27dd9 JM	277	if (!vol)
6db27dd9 JM	278	return 0;
1da177e4 LT	279	strlcpy(volume, vol, 32);
	280	kfree(vol);
	281	break;
	282	}
	283	case Opt_ignore:
	284	/* Silently ignore the quota options */
	285	break;
	286	default:
0158de12 FF	287	pr_warn("Unrecognized mount option \"%s\" or missing value\n",
0158de12 FF	288	p);
1da177e4 LT	289	return 0;
	290	}
	291	}
	292	return 1;
	293	}
	294
	295	/* This function definitely needs to be split up. Some fine day I'll
	296	* hopefully have the guts to do so. Until then: sorry for the mess.
	297	*/
	298
	299	static int affs_fill_super(struct super_block sb, void data, int silent)
	300	{
	301	struct affs_sb_info *sbi;
	302	struct buffer_head *root_bh = NULL;
	303	struct buffer_head *boot_bh;
	304	struct inode *root_inode = NULL;
	305	s32 root_block;
	306	int size, blocksize;
	307	u32 chksum;
	308	int num_bm;
	309	int i, j;
8fed10be EB	310	kuid_t uid;
8fed10be EB	311	kgid_t gid;
1da177e4 LT	312	int reserved;
	313	unsigned long mount_flags;
	314	int tmp_flags; /* fix remount prototype... */
2b943cf0	315	u8 sig[4];
842a859d	316	int ret;
1da177e4	317
e9b3961b MS	318	save_mount_options(sb, data);
e9b3961b MS	319
9606d9aa	320	pr_debug("read_super(%s)\n", data ? (const char *)data : "no options");
1da177e4 LT	321
	322	sb->s_magic = AFFS_SUPER_MAGIC;
	323	sb->s_op = &affs_sops;
	324	sb->s_flags \|= MS_NODIRATIME;
	325
f8314dc6	326	sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
1da177e4 LT	327	if (!sbi)
1da177e4 LT	328	return -ENOMEM;
74c41429	329
1da177e4	330	sb->s_fs_info = sbi;
a215fef7	331	sbi->sb = sb;
7d135a5d	332	mutex_init(&sbi->s_bmlock);
29333920	333	spin_lock_init(&sbi->symlink_lock);
3dd84782 AB	334	spin_lock_init(&sbi->work_lock);
3dd84782 AB	335	INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
1da177e4 LT	336
	337	if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
	338	&blocksize,&sbi->s_prefix,
	339	sbi->s_volume, &mount_flags)) {
0158de12	340	pr_err("Error parsing options\n");
1da177e4 LT	341	return -EINVAL;
	342	}
	343	/* N.B. after this point s_prefix must be released */
	344
	345	sbi->s_flags = mount_flags;
	346	sbi->s_mode = i;
	347	sbi->s_uid = uid;
	348	sbi->s_gid = gid;
	349	sbi->s_reserved= reserved;
	350
	351	/* Get the size of the device in 512-byte blocks.
	352	* If we later see that the partition uses bigger
	353	* blocks, we will have to change it.
	354	*/
	355
e852d82a	356	size = i_size_read(sb->s_bdev->bd_inode) >> 9;
9606d9aa	357	pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size);
1da177e4 LT	358
	359	affs_set_blocksize(sb, PAGE_SIZE);
	360	/* Try to find root block. Its location depends on the block size. */
	361
e852d82a PKS	362	i = bdev_logical_block_size(sb->s_bdev);
e852d82a PKS	363	j = PAGE_SIZE;
1da177e4 LT	364	if (blocksize > 0) {
	365	i = j = blocksize;
	366	size = size / (blocksize / 512);
	367	}
e852d82a	368
1e907f4f	369	for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) {
1da177e4 LT	370	sbi->s_root_block = root_block;
	371	if (root_block < 0)
	372	sbi->s_root_block = (reserved + size - 1) / 2;
9606d9aa	373	pr_debug("setting blocksize to %d\n", blocksize);
1da177e4 LT	374	affs_set_blocksize(sb, blocksize);
	375	sbi->s_partition_size = size;
	376
	377	/* The root block location that was calculated above is not
	378	* correct if the partition size is an odd number of 512-
	379	* byte blocks, which will be rounded down to a number of
	380	* 1024-byte blocks, and if there were an even number of
	381	* reserved blocks. Ideally, all partition checkers should
	382	* report the real number of blocks of the real blocksize,
	383	* but since this just cannot be done, we have to try to
	384	* find the root block anyways. In the above case, it is one
	385	* block behind the calculated one. So we check this one, too.
	386	*/
	387	for (num_bm = 0; num_bm < 2; num_bm++) {
9606d9aa	388	pr_debug("Dev %s, trying root=%u, bs=%d, "
1da177e4 LT	389	"size=%d, reserved=%d\n",
	390	sb->s_id,
	391	sbi->s_root_block + num_bm,
	392	blocksize, size, reserved);
	393	root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
	394	if (!root_bh)
	395	continue;
	396	if (!affs_checksum_block(sb, root_bh) &&
	397	be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
	398	be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
	399	sbi->s_hashsize = blocksize / 4 - 56;
	400	sbi->s_root_block += num_bm;
1da177e4 LT	401	goto got_root;
	402	}
	403	affs_brelse(root_bh);
	404	root_bh = NULL;
	405	}
	406	}
	407	if (!silent)
0158de12	408	pr_err("No valid root block on device %s\n", sb->s_id);
842a859d	409	return -EINVAL;
1da177e4 LT	410
	411	/* N.B. after this point bh must be released */
	412	got_root:
842a859d AV	413	/* Keep super block in cache */
842a859d AV	414	sbi->s_root_bh = root_bh;
1da177e4 LT	415	root_block = sbi->s_root_block;
	416
	417	/* Find out which kind of FS we have */
	418	boot_bh = sb_bread(sb, 0);
	419	if (!boot_bh) {
0158de12	420	pr_err("Cannot read boot block\n");
842a859d	421	return -EINVAL;
1da177e4	422	}
2b943cf0	423	memcpy(sig, boot_bh->b_data, 4);
1da177e4	424	brelse(boot_bh);
2b943cf0	425	chksum = be32_to_cpu((__be32 )sig);
1da177e4 LT	426
	427	/* Dircache filesystems are compatible with non-dircache ones
	428	* when reading. As long as they aren't supported, writing is
	429	* not recommended.
	430	*/
	431	if ((chksum == FS_DCFFS \|\| chksum == MUFS_DCFFS \|\| chksum == FS_DCOFS
	432	\|\| chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
0158de12	433	pr_notice("Dircache FS - mounting %s read only\n", sb->s_id);
1da177e4 LT	434	sb->s_flags \|= MS_RDONLY;
	435	}
	436	switch (chksum) {
0445f01a FF	437	case MUFS_FS:
	438	case MUFS_INTLFFS:
	439	case MUFS_DCFFS:
34f24835	440	affs_set_opt(sbi->s_flags, SF_MUFS);
0445f01a FF	441	/* fall thru */
	442	case FS_INTLFFS:
	443	case FS_DCFFS:
34f24835	444	affs_set_opt(sbi->s_flags, SF_INTL);
0445f01a FF	445	break;
0445f01a FF	446	case MUFS_FFS:
34f24835	447	affs_set_opt(sbi->s_flags, SF_MUFS);
0445f01a FF	448	break;
	449	case FS_FFS:
	450	break;
	451	case MUFS_OFS:
34f24835	452	affs_set_opt(sbi->s_flags, SF_MUFS);
0445f01a FF	453	/* fall thru */
0445f01a FF	454	case FS_OFS:
34f24835	455	affs_set_opt(sbi->s_flags, SF_OFS);
0445f01a FF	456	sb->s_flags \|= MS_NOEXEC;
	457	break;
	458	case MUFS_DCOFS:
	459	case MUFS_INTLOFS:
34f24835	460	affs_set_opt(sbi->s_flags, SF_MUFS);
0445f01a FF	461	case FS_DCOFS:
0445f01a FF	462	case FS_INTLOFS:
34f24835 FF	463	affs_set_opt(sbi->s_flags, SF_INTL);
34f24835 FF	464	affs_set_opt(sbi->s_flags, SF_OFS);
0445f01a FF	465	sb->s_flags \|= MS_NOEXEC;
	466	break;
	467	default:
	468	pr_err("Unknown filesystem on device %s: %08X\n",
	469	sb->s_id, chksum);
	470	return -EINVAL;
1da177e4 LT	471	}
1da177e4 LT	472
79bda4d5	473	if (affs_test_opt(mount_flags, SF_VERBOSE)) {
2b943cf0	474	u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
0158de12	475	pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
2b943cf0	476	len > 31 ? 31 : len,
1da177e4	477	AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
2b943cf0	478	sig, sig[3] + '0', blocksize);
1da177e4 LT	479	}
	480
	481	sb->s_flags \|= MS_NODEV \| MS_NOSUID;
	482
	483	sbi->s_data_blksize = sb->s_blocksize;
79bda4d5	484	if (affs_test_opt(sbi->s_flags, SF_OFS))
1da177e4 LT	485	sbi->s_data_blksize -= 24;
1da177e4 LT	486
1da177e4	487	tmp_flags = sb->s_flags;
842a859d AV	488	ret = affs_init_bitmap(sb, &tmp_flags);
	489	if (ret)
	490	return ret;
1da177e4 LT	491	sb->s_flags = tmp_flags;
	492
	493	/* set up enough so that it can read an inode */
	494
210f8559	495	root_inode = affs_iget(sb, root_block);
842a859d AV	496	if (IS_ERR(root_inode))
842a859d AV	497	return PTR_ERR(root_inode);
210f8559	498
79bda4d5	499	if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL))
a129880d AV	500	sb->s_d_op = &affs_intl_dentry_operations;
	501	else
	502	sb->s_d_op = &affs_dentry_operations;
	503
48fde701	504	sb->s_root = d_make_root(root_inode);
1da177e4	505	if (!sb->s_root) {
0158de12	506	pr_err("AFFS: Get root inode failed\n");
842a859d	507	return -ENOMEM;
1da177e4	508	}
1da177e4	509
9606d9aa	510	pr_debug("s_flags=%lX\n", sb->s_flags);
1da177e4	511	return 0;
1da177e4 LT	512	}
	513
	514	static int
	515	affs_remount(struct super_block sb, int flags, char *data)
	516	{
	517	struct affs_sb_info *sbi = AFFS_SB(sb);
	518	int blocksize;
8fed10be EB	519	kuid_t uid;
8fed10be EB	520	kgid_t gid;
1da177e4 LT	521	int mode;
	522	int reserved;
	523	int root_block;
	524	unsigned long mount_flags;
	525	int res = 0;
c8f33d0b	526	char *new_opts;
29333920 AV	527	char volume[32];
29333920 AV	528	char *prefix = NULL;
1da177e4	529
c8f33d0b SK	530	new_opts = kstrdup(data, GFP_KERNEL);
	531	if (!new_opts)
	532	return -ENOMEM;
	533
9606d9aa	534	pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data);
1da177e4	535
02b9984d	536	sync_filesystem(sb);
1da177e4 LT	537	*flags \|= MS_NODIRATIME;
1da177e4 LT	538
29333920	539	memcpy(volume, sbi->s_volume, 32);
e9b3961b	540	if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
29333920	541	&blocksize, &prefix, volume,
e9b3961b	542	&mount_flags)) {
29333920	543	kfree(prefix);
e9b3961b	544	kfree(new_opts);
1da177e4	545	return -EINVAL;
e9b3961b	546	}
74c41429	547
43829731	548	flush_delayed_work(&sbi->sb_work);
2a32cebd	549	replace_mount_options(sb, new_opts);
e9b3961b	550
1da177e4 LT	551	sbi->s_flags = mount_flags;
	552	sbi->s_mode = mode;
	553	sbi->s_uid = uid;
	554	sbi->s_gid = gid;
29333920 AV	555	/* protect against readers */
	556	spin_lock(&sbi->symlink_lock);
	557	if (prefix) {
	558	kfree(sbi->s_prefix);
	559	sbi->s_prefix = prefix;
	560	}
	561	memcpy(sbi->s_volume, volume, 32);
	562	spin_unlock(&sbi->symlink_lock);
1da177e4	563
74c41429	564	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
1da177e4	565	return 0;
74c41429	566
0164b1a3	567	if (*flags & MS_RDONLY)
1da177e4	568	affs_free_bitmap(sb);
0164b1a3	569	else
1da177e4 LT	570	res = affs_init_bitmap(sb, flags);
	571
	572	return res;
	573	}
	574
	575	static int
726c3342	576	affs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	577	{
726c3342	578	struct super_block *sb = dentry->d_sb;
1da177e4	579	int free;
a6a2a73c	580	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1da177e4	581
9606d9aa FF	582	pr_debug("%s() partsize=%d, reserved=%d\n",
	583	__func__, AFFS_SB(sb)->s_partition_size,
	584	AFFS_SB(sb)->s_reserved);
1da177e4 LT	585
	586	free = affs_count_free_blocks(sb);
	587	buf->f_type = AFFS_SUPER_MAGIC;
	588	buf->f_bsize = sb->s_blocksize;
	589	buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
	590	buf->f_bfree = free;
	591	buf->f_bavail = free;
a6a2a73c CL	592	buf->f_fsid.val[0] = (u32)id;
a6a2a73c CL	593	buf->f_fsid.val[1] = (u32)(id >> 32);
f157853e	594	buf->f_namelen = AFFSNAMEMAX;
1da177e4 LT	595	return 0;
	596	}
	597
152a0836 AV	598	static struct dentry affs_mount(struct file_system_type fs_type,
152a0836 AV	599	int flags, const char dev_name, void data)
1da177e4	600	{
152a0836	601	return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
1da177e4 LT	602	}
1da177e4 LT	603
842a859d AV	604	static void affs_kill_sb(struct super_block *sb)
	605	{
	606	struct affs_sb_info *sbi = AFFS_SB(sb);
	607	kill_block_super(sb);
	608	if (sbi) {
	609	affs_free_bitmap(sb);
	610	affs_brelse(sbi->s_root_bh);
	611	kfree(sbi->s_prefix);
4d29e571	612	mutex_destroy(&sbi->s_bmlock);
842a859d AV	613	kfree(sbi);
	614	}
	615	}
	616
1da177e4 LT	617	static struct file_system_type affs_fs_type = {
	618	.owner = THIS_MODULE,
	619	.name = "affs",
152a0836	620	.mount = affs_mount,
842a859d	621	.kill_sb = affs_kill_sb,
1da177e4 LT	622	.fs_flags = FS_REQUIRES_DEV,
1da177e4 LT	623	};
7f78e035	624	MODULE_ALIAS_FS("affs");
1da177e4 LT	625
	626	static int __init init_affs_fs(void)
	627	{
	628	int err = init_inodecache();
	629	if (err)
	630	goto out1;
	631	err = register_filesystem(&affs_fs_type);
	632	if (err)
	633	goto out;
	634	return 0;
	635	out:
	636	destroy_inodecache();
	637	out1:
	638	return err;
	639	}
	640
	641	static void __exit exit_affs_fs(void)
	642	{
	643	unregister_filesystem(&affs_fs_type);
	644	destroy_inodecache();
	645	}
	646
	647	MODULE_DESCRIPTION("Amiga filesystem support for Linux");
	648	MODULE_LICENSE("GPL");
	649
	650	module_init(init_affs_fs)
	651	module_exit(exit_affs_fs)