[mirror_ubuntu-zesty-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 <linux/writeback.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);

	lock_buffer(bh);
	secs_to_datestamp(get_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("AFFS: put_super()\n");

	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_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)
{
	/*
	 * 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_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, 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) {
				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 = make_kgid(current_user_ns(), option);
			if (!gid_valid(*gid))
				return 0;
			*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;
			*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;
	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("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;
	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)) {
		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);
	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) {
		printk(KERN_ERR "AFFS: 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)) {
		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);
			return -EINVAL;
	}

	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;

	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_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");
		return -ENOMEM;
	}

	pr_debug("AFFS: 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 = 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;
	}

	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("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 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);
		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>
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
bc86256d	29	affs_commit_super(struct super_block *sb, int wait)
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
a8371074	35	lock_buffer(bh);
e2896436 CH	36	secs_to_datestamp(get_seconds(), &tail->disk_change);
e2896436 CH	37	affs_fix_checksum(sb, bh);
a8371074 AB	38	unlock_buffer(bh);
a8371074 AB	39
e2896436	40	mark_buffer_dirty(bh);
7435d506 AB	41	if (wait)
7435d506 AB	42	sync_dirty_buffer(bh);
e2896436 CH	43	}
e2896436 CH	44
1da177e4 LT	45	static void
	46	affs_put_super(struct super_block *sb)
	47	{
	48	struct affs_sb_info *sbi = AFFS_SB(sb);
	49	pr_debug("AFFS: put_super()\n");
	50
3dd84782	51	cancel_delayed_work_sync(&sbi->sb_work);
1da177e4 LT	52	}
1da177e4 LT	53
e2896436 CH	54	static int
	55	affs_sync_fs(struct super_block *sb, int wait)
	56	{
bc86256d	57	affs_commit_super(sb, wait);
e2896436 CH	58	return 0;
	59	}
	60
3dd84782 AB	61	static void flush_superblock(struct work_struct *work)
	62	{
	63	struct affs_sb_info *sbi;
	64	struct super_block *sb;
	65
	66	sbi = container_of(work, struct affs_sb_info, sb_work.work);
	67	sb = sbi->sb;
	68
	69	spin_lock(&sbi->work_lock);
	70	sbi->work_queued = 0;
	71	spin_unlock(&sbi->work_lock);
	72
	73	affs_commit_super(sb, 1);
	74	}
	75
	76	void affs_mark_sb_dirty(struct super_block *sb)
	77	{
	78	struct affs_sb_info *sbi = AFFS_SB(sb);
	79	unsigned long delay;
	80
	81	if (sb->s_flags & MS_RDONLY)
	82	return;
	83
	84	spin_lock(&sbi->work_lock);
	85	if (!sbi->work_queued) {
	86	delay = msecs_to_jiffies(dirty_writeback_interval * 10);
	87	queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
	88	sbi->work_queued = 1;
	89	}
	90	spin_unlock(&sbi->work_lock);
	91	}
	92
e18b890b	93	static struct kmem_cache * affs_inode_cachep;
1da177e4 LT	94
	95	static struct inode affs_alloc_inode(struct super_block sb)
	96	{
dca3c336 RZ	97	struct affs_inode_info *i;
	98
	99	i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
	100	if (!i)
1da177e4	101	return NULL;
dca3c336 RZ	102
	103	i->vfs_inode.i_version = 1;
	104	i->i_lc = NULL;
	105	i->i_ext_bh = NULL;
	106	i->i_pa_cnt = 0;
	107
	108	return &i->vfs_inode;
1da177e4 LT	109	}
1da177e4 LT	110
fa0d7e3d	111	static void affs_i_callback(struct rcu_head *head)
1da177e4	112	{
fa0d7e3d	113	struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4 LT	114	kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
	115	}
	116
fa0d7e3d NP	117	static void affs_destroy_inode(struct inode *inode)
	118	{
	119	call_rcu(&inode->i_rcu, affs_i_callback);
	120	}
	121
51cc5068	122	static void init_once(void *foo)
1da177e4 LT	123	{
	124	struct affs_inode_info ei = (struct affs_inode_info ) foo;
	125
756b0322 TG	126	sema_init(&ei->i_link_lock, 1);
756b0322 TG	127	sema_init(&ei->i_ext_lock, 1);
a35afb83	128	inode_init_once(&ei->vfs_inode);
1da177e4 LT	129	}
	130
	131	static int init_inodecache(void)
	132	{
	133	affs_inode_cachep = kmem_cache_create("affs_inode_cache",
	134	sizeof(struct affs_inode_info),
fffb60f9 PJ	135	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	136	SLAB_MEM_SPREAD),
20c2df83	137	init_once);
1da177e4 LT	138	if (affs_inode_cachep == NULL)
	139	return -ENOMEM;
	140	return 0;
	141	}
	142
	143	static void destroy_inodecache(void)
	144	{
8c0a8537 KS	145	/*
	146	* Make sure all delayed rcu free inodes are flushed before we
	147	* destroy cache.
	148	*/
	149	rcu_barrier();
1a1d92c1	150	kmem_cache_destroy(affs_inode_cachep);
1da177e4 LT	151	}
1da177e4 LT	152
ee9b6d61	153	static const struct super_operations affs_sops = {
1da177e4 LT	154	.alloc_inode = affs_alloc_inode,
1da177e4 LT	155	.destroy_inode = affs_destroy_inode,
1da177e4	156	.write_inode = affs_write_inode,
f053ddde	157	.evict_inode = affs_evict_inode,
1da177e4	158	.put_super = affs_put_super,
e2896436	159	.sync_fs = affs_sync_fs,
1da177e4 LT	160	.statfs = affs_statfs,
1da177e4 LT	161	.remount_fs = affs_remount,
e9b3961b	162	.show_options = generic_show_options,
1da177e4 LT	163	};
	164
	165	enum {
	166	Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
	167	Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
	168	Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
	169	};
	170
a447c093	171	static const match_table_t tokens = {
1da177e4 LT	172	{Opt_bs, "bs=%u"},
	173	{Opt_mode, "mode=%o"},
	174	{Opt_mufs, "mufs"},
	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
	221	&& n != 4096) {
	222	printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
	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 LT	230	*mode = option & 0777;
	231	*mount_opts \|= SF_SETMODE;
	232	break;
	233	case Opt_mufs:
	234	*mount_opts \|= SF_MUFS;
	235	break;
	236	case Opt_prefix:
1da177e4 LT	237	*prefix = match_strdup(&args[0]);
	238	if (!*prefix)
	239	return 0;
	240	*mount_opts \|= SF_PREFIX;
	241	break;
	242	case Opt_protect:
	243	*mount_opts \|= SF_IMMUTABLE;
	244	break;
	245	case Opt_reserved:
	246	if (match_int(&args[0], reserved))
217686e9	247	return 0;
1da177e4 LT	248	break;
	249	case Opt_root:
	250	if (match_int(&args[0], root))
217686e9	251	return 0;
1da177e4 LT	252	break;
	253	case Opt_setgid:
	254	if (match_int(&args[0], &option))
217686e9	255	return 0;
8fed10be EB	256	*gid = make_kgid(current_user_ns(), option);
	257	if (!gid_valid(*gid))
	258	return 0;
1da177e4 LT	259	*mount_opts \|= SF_SETGID;
	260	break;
	261	case Opt_setuid:
	262	if (match_int(&args[0], &option))
217686e9	263	return 0;
8fed10be EB	264	*uid = make_kuid(current_user_ns(), option);
	265	if (!uid_valid(*uid))
	266	return 0;
1da177e4 LT	267	*mount_opts \|= SF_SETUID;
	268	break;
	269	case Opt_verbose:
	270	*mount_opts \|= SF_VERBOSE;
	271	break;
	272	case Opt_volume: {
	273	char *vol = match_strdup(&args[0]);
6db27dd9 JM	274	if (!vol)
6db27dd9 JM	275	return 0;
1da177e4 LT	276	strlcpy(volume, vol, 32);
	277	kfree(vol);
	278	break;
	279	}
	280	case Opt_ignore:
	281	/* Silently ignore the quota options */
	282	break;
	283	default:
	284	printk("AFFS: Unrecognized mount option \"%s\" "
	285	"or missing value\n", p);
	286	return 0;
	287	}
	288	}
	289	return 1;
	290	}
	291
	292	/* This function definitely needs to be split up. Some fine day I'll
	293	* hopefully have the guts to do so. Until then: sorry for the mess.
	294	*/
	295
	296	static int affs_fill_super(struct super_block sb, void data, int silent)
	297	{
	298	struct affs_sb_info *sbi;
	299	struct buffer_head *root_bh = NULL;
	300	struct buffer_head *boot_bh;
	301	struct inode *root_inode = NULL;
	302	s32 root_block;
	303	int size, blocksize;
	304	u32 chksum;
	305	int num_bm;
	306	int i, j;
	307	s32 key;
8fed10be EB	308	kuid_t uid;
8fed10be EB	309	kgid_t gid;
1da177e4 LT	310	int reserved;
	311	unsigned long mount_flags;
	312	int tmp_flags; /* fix remount prototype... */
2b943cf0	313	u8 sig[4];
842a859d	314	int ret;
1da177e4	315
e9b3961b MS	316	save_mount_options(sb, data);
e9b3961b MS	317
1da177e4 LT	318	pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
	319
	320	sb->s_magic = AFFS_SUPER_MAGIC;
	321	sb->s_op = &affs_sops;
	322	sb->s_flags \|= MS_NODIRATIME;
	323
f8314dc6	324	sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
1da177e4 LT	325	if (!sbi)
1da177e4 LT	326	return -ENOMEM;
74c41429	327
1da177e4	328	sb->s_fs_info = sbi;
a215fef7	329	sbi->sb = sb;
7d135a5d	330	mutex_init(&sbi->s_bmlock);
29333920	331	spin_lock_init(&sbi->symlink_lock);
3dd84782 AB	332	spin_lock_init(&sbi->work_lock);
3dd84782 AB	333	INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
1da177e4 LT	334
	335	if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
	336	&blocksize,&sbi->s_prefix,
	337	sbi->s_volume, &mount_flags)) {
	338	printk(KERN_ERR "AFFS: Error parsing options\n");
afc70ed0 AV	339	kfree(sbi->s_prefix);
afc70ed0 AV	340	kfree(sbi);
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
	356	size = sb->s_bdev->bd_inode->i_size >> 9;
	357	pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
	358
	359	affs_set_blocksize(sb, PAGE_SIZE);
	360	/* Try to find root block. Its location depends on the block size. */
	361
	362	i = 512;
	363	j = 4096;
	364	if (blocksize > 0) {
	365	i = j = blocksize;
	366	size = size / (blocksize / 512);
	367	}
	368	for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
	369	sbi->s_root_block = root_block;
	370	if (root_block < 0)
	371	sbi->s_root_block = (reserved + size - 1) / 2;
	372	pr_debug("AFFS: setting blocksize to %d\n", blocksize);
	373	affs_set_blocksize(sb, blocksize);
	374	sbi->s_partition_size = size;
	375
	376	/* The root block location that was calculated above is not
	377	* correct if the partition size is an odd number of 512-
	378	* byte blocks, which will be rounded down to a number of
	379	* 1024-byte blocks, and if there were an even number of
	380	* reserved blocks. Ideally, all partition checkers should
	381	* report the real number of blocks of the real blocksize,
	382	* but since this just cannot be done, we have to try to
	383	* find the root block anyways. In the above case, it is one
	384	* block behind the calculated one. So we check this one, too.
	385	*/
	386	for (num_bm = 0; num_bm < 2; num_bm++) {
	387	pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
	388	"size=%d, reserved=%d\n",
	389	sb->s_id,
	390	sbi->s_root_block + num_bm,
	391	blocksize, size, reserved);
	392	root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
	393	if (!root_bh)
	394	continue;
	395	if (!affs_checksum_block(sb, root_bh) &&
	396	be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
	397	be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
	398	sbi->s_hashsize = blocksize / 4 - 56;
	399	sbi->s_root_block += num_bm;
	400	key = 1;
	401	goto got_root;
	402	}
	403	affs_brelse(root_bh);
	404	root_bh = NULL;
405	}
406	}
407	if (!silent)
408	printk(KERN_ERR "AFFS: No valid root block on device %s\n",
409	sb->s_id);
842a859d	410	return -EINVAL;
1da177e4 LT	411
	412	/* N.B. after this point bh must be released */
	413	got_root:
842a859d AV	414	/* Keep super block in cache */
842a859d AV	415	sbi->s_root_bh = root_bh;
1da177e4 LT	416	root_block = sbi->s_root_block;
	417
	418	/* Find out which kind of FS we have */
	419	boot_bh = sb_bread(sb, 0);
	420	if (!boot_bh) {
	421	printk(KERN_ERR "AFFS: Cannot read boot block\n");
842a859d	422	return -EINVAL;
1da177e4	423	}
2b943cf0	424	memcpy(sig, boot_bh->b_data, 4);
1da177e4	425	brelse(boot_bh);
2b943cf0	426	chksum = be32_to_cpu((__be32 )sig);
1da177e4 LT	427
	428	/* Dircache filesystems are compatible with non-dircache ones
	429	* when reading. As long as they aren't supported, writing is
	430	* not recommended.
	431	*/
	432	if ((chksum == FS_DCFFS \|\| chksum == MUFS_DCFFS \|\| chksum == FS_DCOFS
	433	\|\| chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
	434	printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
	435	sb->s_id);
	436	sb->s_flags \|= MS_RDONLY;
	437	}
	438	switch (chksum) {
	439	case MUFS_FS:
	440	case MUFS_INTLFFS:
	441	case MUFS_DCFFS:
	442	sbi->s_flags \|= SF_MUFS;
	443	/* fall thru */
	444	case FS_INTLFFS:
	445	case FS_DCFFS:
	446	sbi->s_flags \|= SF_INTL;
	447	break;
	448	case MUFS_FFS:
	449	sbi->s_flags \|= SF_MUFS;
	450	break;
	451	case FS_FFS:
	452	break;
	453	case MUFS_OFS:
	454	sbi->s_flags \|= SF_MUFS;
	455	/* fall thru */
	456	case FS_OFS:
	457	sbi->s_flags \|= SF_OFS;
	458	sb->s_flags \|= MS_NOEXEC;
	459	break;
	460	case MUFS_DCOFS:
	461	case MUFS_INTLOFS:
	462	sbi->s_flags \|= SF_MUFS;
	463	case FS_DCOFS:
	464	case FS_INTLOFS:
	465	sbi->s_flags \|= SF_INTL \| SF_OFS;
	466	sb->s_flags \|= MS_NOEXEC;
	467	break;
	468	default:
	469	printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
	470	sb->s_id, chksum);
842a859d	471	return -EINVAL;
1da177e4 LT	472	}
	473
	474	if (mount_flags & SF_VERBOSE) {
2b943cf0 AV	475	u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
	476	printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
	477	len > 31 ? 31 : len,
1da177e4	478	AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
2b943cf0	479	sig, sig[3] + '0', blocksize);
1da177e4 LT	480	}
	481
	482	sb->s_flags \|= MS_NODEV \| MS_NOSUID;
	483
	484	sbi->s_data_blksize = sb->s_blocksize;
	485	if (sbi->s_flags & SF_OFS)
	486	sbi->s_data_blksize -= 24;
	487
1da177e4	488	tmp_flags = sb->s_flags;
842a859d AV	489	ret = affs_init_bitmap(sb, &tmp_flags);
	490	if (ret)
	491	return ret;
1da177e4 LT	492	sb->s_flags = tmp_flags;
	493
	494	/* set up enough so that it can read an inode */
	495
210f8559	496	root_inode = affs_iget(sb, root_block);
842a859d AV	497	if (IS_ERR(root_inode))
842a859d AV	498	return PTR_ERR(root_inode);
210f8559	499
a129880d AV	500	if (AFFS_SB(sb)->s_flags & SF_INTL)
	501	sb->s_d_op = &affs_intl_dentry_operations;
	502	else
	503	sb->s_d_op = &affs_dentry_operations;
	504
48fde701	505	sb->s_root = d_make_root(root_inode);
1da177e4 LT	506	if (!sb->s_root) {
1da177e4 LT	507	printk(KERN_ERR "AFFS: Get root inode failed\n");
842a859d	508	return -ENOMEM;
1da177e4	509	}
1da177e4 LT	510
	511	pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
	512	return 0;
1da177e4 LT	513	}
	514
	515	static int
	516	affs_remount(struct super_block sb, int flags, char *data)
	517	{
	518	struct affs_sb_info *sbi = AFFS_SB(sb);
	519	int blocksize;
8fed10be EB	520	kuid_t uid;
8fed10be EB	521	kgid_t gid;
1da177e4 LT	522	int mode;
	523	int reserved;
	524	int root_block;
	525	unsigned long mount_flags;
	526	int res = 0;
e9b3961b	527	char *new_opts = kstrdup(data, GFP_KERNEL);
29333920 AV	528	char volume[32];
29333920 AV	529	char *prefix = NULL;
1da177e4 LT	530
	531	pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
	532
	533	*flags \|= MS_NODIRATIME;
	534
29333920	535	memcpy(volume, sbi->s_volume, 32);
e9b3961b	536	if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
29333920	537	&blocksize, &prefix, volume,
e9b3961b	538	&mount_flags)) {
29333920	539	kfree(prefix);
e9b3961b	540	kfree(new_opts);
1da177e4	541	return -EINVAL;
e9b3961b	542	}
74c41429	543
43829731	544	flush_delayed_work(&sbi->sb_work);
2a32cebd	545	replace_mount_options(sb, new_opts);
e9b3961b	546
1da177e4 LT	547	sbi->s_flags = mount_flags;
	548	sbi->s_mode = mode;
	549	sbi->s_uid = uid;
	550	sbi->s_gid = gid;
29333920 AV	551	/* protect against readers */
	552	spin_lock(&sbi->symlink_lock);
	553	if (prefix) {
	554	kfree(sbi->s_prefix);
	555	sbi->s_prefix = prefix;
	556	}
	557	memcpy(sbi->s_volume, volume, 32);
	558	spin_unlock(&sbi->symlink_lock);
1da177e4	559
74c41429	560	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
1da177e4	561	return 0;
74c41429	562
0164b1a3	563	if (*flags & MS_RDONLY)
1da177e4	564	affs_free_bitmap(sb);
0164b1a3	565	else
1da177e4 LT	566	res = affs_init_bitmap(sb, flags);
	567
	568	return res;
	569	}
	570
	571	static int
726c3342	572	affs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	573	{
726c3342	574	struct super_block *sb = dentry->d_sb;
1da177e4	575	int free;
a6a2a73c	576	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1da177e4 LT	577
	578	pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
	579	AFFS_SB(sb)->s_reserved);
	580
	581	free = affs_count_free_blocks(sb);
	582	buf->f_type = AFFS_SUPER_MAGIC;
	583	buf->f_bsize = sb->s_blocksize;
	584	buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
	585	buf->f_bfree = free;
	586	buf->f_bavail = free;
a6a2a73c CL	587	buf->f_fsid.val[0] = (u32)id;
	588	buf->f_fsid.val[1] = (u32)(id >> 32);
	589	buf->f_namelen = 30;
1da177e4 LT	590	return 0;
	591	}
	592
152a0836 AV	593	static struct dentry affs_mount(struct file_system_type fs_type,
152a0836 AV	594	int flags, const char dev_name, void data)
1da177e4	595	{
152a0836	596	return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
1da177e4 LT	597	}
1da177e4 LT	598
842a859d AV	599	static void affs_kill_sb(struct super_block *sb)
	600	{
	601	struct affs_sb_info *sbi = AFFS_SB(sb);
	602	kill_block_super(sb);
	603	if (sbi) {
	604	affs_free_bitmap(sb);
	605	affs_brelse(sbi->s_root_bh);
	606	kfree(sbi->s_prefix);
	607	kfree(sbi);
	608	}
	609	}
	610
1da177e4 LT	611	static struct file_system_type affs_fs_type = {
	612	.owner = THIS_MODULE,
	613	.name = "affs",
152a0836	614	.mount = affs_mount,
842a859d	615	.kill_sb = affs_kill_sb,
1da177e4 LT	616	.fs_flags = FS_REQUIRES_DEV,
1da177e4 LT	617	};
7f78e035	618	MODULE_ALIAS_FS("affs");
1da177e4 LT	619
	620	static int __init init_affs_fs(void)
	621	{
	622	int err = init_inodecache();
	623	if (err)
	624	goto out1;
	625	err = register_filesystem(&affs_fs_type);
	626	if (err)
	627	goto out;
	628	return 0;
	629	out:
	630	destroy_inodecache();
	631	out1:
	632	return err;
	633	}
	634
	635	static void __exit exit_affs_fs(void)
	636	{
	637	unregister_filesystem(&affs_fs_type);
	638	destroy_inodecache();
	639	}
	640
	641	MODULE_DESCRIPTION("Amiga filesystem support for Linux");
	642	MODULE_LICENSE("GPL");
	643
	644	module_init(init_affs_fs)
	645	module_exit(exit_affs_fs)