[linux.git] / fs / affs / super.c

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

#include <linux/module.h>
#include <linux/init.h>
#include <linux/statfs.h>
#include <linux/parser.h>
#include <linux/magic.h>
#include <linux/sched.h>
#include <linux/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);
	kfree(sbi->s_prefix);
	affs_free_bitmap(sb);
	affs_brelse(sbi->s_root_bh);
	kfree(sbi);
	sb->s_fs_info = NULL;
}

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 = -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;
	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);
	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;
	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 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,
};
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);
f99d49ad	52	kfree(sbi->s_prefix);
1da177e4 LT	53	affs_free_bitmap(sb);
	54	affs_brelse(sbi->s_root_bh);
	55	kfree(sbi);
	56	sb->s_fs_info = NULL;
1da177e4 LT	57	}
1da177e4 LT	58
e2896436 CH	59	static int
	60	affs_sync_fs(struct super_block *sb, int wait)
	61	{
bc86256d	62	affs_commit_super(sb, wait);
e2896436 CH	63	return 0;
	64	}
	65
3dd84782 AB	66	static void flush_superblock(struct work_struct *work)
	67	{
	68	struct affs_sb_info *sbi;
	69	struct super_block *sb;
	70
	71	sbi = container_of(work, struct affs_sb_info, sb_work.work);
	72	sb = sbi->sb;
	73
	74	spin_lock(&sbi->work_lock);
	75	sbi->work_queued = 0;
	76	spin_unlock(&sbi->work_lock);
	77
	78	affs_commit_super(sb, 1);
	79	}
	80
	81	void affs_mark_sb_dirty(struct super_block *sb)
	82	{
	83	struct affs_sb_info *sbi = AFFS_SB(sb);
	84	unsigned long delay;
	85
	86	if (sb->s_flags & MS_RDONLY)
	87	return;
	88
	89	spin_lock(&sbi->work_lock);
	90	if (!sbi->work_queued) {
	91	delay = msecs_to_jiffies(dirty_writeback_interval * 10);
	92	queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
	93	sbi->work_queued = 1;
	94	}
	95	spin_unlock(&sbi->work_lock);
	96	}
	97
e18b890b	98	static struct kmem_cache * affs_inode_cachep;
1da177e4 LT	99
	100	static struct inode affs_alloc_inode(struct super_block sb)
	101	{
dca3c336 RZ	102	struct affs_inode_info *i;
	103
	104	i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
	105	if (!i)
1da177e4	106	return NULL;
dca3c336 RZ	107
	108	i->vfs_inode.i_version = 1;
	109	i->i_lc = NULL;
	110	i->i_ext_bh = NULL;
	111	i->i_pa_cnt = 0;
	112
	113	return &i->vfs_inode;
1da177e4 LT	114	}
1da177e4 LT	115
fa0d7e3d	116	static void affs_i_callback(struct rcu_head *head)
1da177e4	117	{
fa0d7e3d	118	struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4 LT	119	kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
	120	}
	121
fa0d7e3d NP	122	static void affs_destroy_inode(struct inode *inode)
	123	{
	124	call_rcu(&inode->i_rcu, affs_i_callback);
	125	}
	126
51cc5068	127	static void init_once(void *foo)
1da177e4 LT	128	{
	129	struct affs_inode_info ei = (struct affs_inode_info ) foo;
	130
756b0322 TG	131	sema_init(&ei->i_link_lock, 1);
756b0322 TG	132	sema_init(&ei->i_ext_lock, 1);
a35afb83	133	inode_init_once(&ei->vfs_inode);
1da177e4 LT	134	}
	135
	136	static int init_inodecache(void)
	137	{
	138	affs_inode_cachep = kmem_cache_create("affs_inode_cache",
	139	sizeof(struct affs_inode_info),
fffb60f9 PJ	140	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	141	SLAB_MEM_SPREAD),
20c2df83	142	init_once);
1da177e4 LT	143	if (affs_inode_cachep == NULL)
	144	return -ENOMEM;
	145	return 0;
	146	}
	147
	148	static void destroy_inodecache(void)
	149	{
8c0a8537 KS	150	/*
	151	* Make sure all delayed rcu free inodes are flushed before we
	152	* destroy cache.
	153	*/
	154	rcu_barrier();
1a1d92c1	155	kmem_cache_destroy(affs_inode_cachep);
1da177e4 LT	156	}
1da177e4 LT	157
ee9b6d61	158	static const struct super_operations affs_sops = {
1da177e4 LT	159	.alloc_inode = affs_alloc_inode,
1da177e4 LT	160	.destroy_inode = affs_destroy_inode,
1da177e4	161	.write_inode = affs_write_inode,
f053ddde	162	.evict_inode = affs_evict_inode,
1da177e4	163	.put_super = affs_put_super,
e2896436	164	.sync_fs = affs_sync_fs,
1da177e4 LT	165	.statfs = affs_statfs,
1da177e4 LT	166	.remount_fs = affs_remount,
e9b3961b	167	.show_options = generic_show_options,
1da177e4 LT	168	};
	169
	170	enum {
	171	Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
	172	Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
	173	Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
	174	};
	175
a447c093	176	static const match_table_t tokens = {
1da177e4 LT	177	{Opt_bs, "bs=%u"},
	178	{Opt_mode, "mode=%o"},
	179	{Opt_mufs, "mufs"},
	180	{Opt_prefix, "prefix=%s"},
	181	{Opt_protect, "protect"},
	182	{Opt_reserved, "reserved=%u"},
	183	{Opt_root, "root=%u"},
	184	{Opt_setgid, "setgid=%u"},
	185	{Opt_setuid, "setuid=%u"},
	186	{Opt_verbose, "verbose"},
	187	{Opt_volume, "volume=%s"},
	188	{Opt_ignore, "grpquota"},
	189	{Opt_ignore, "noquota"},
	190	{Opt_ignore, "quota"},
	191	{Opt_ignore, "usrquota"},
	192	{Opt_err, NULL},
	193	};
	194
	195	static int
8fed10be	196	parse_options(char options, kuid_t uid, kgid_t gid, int mode, int reserved, s32 root,
1da177e4 LT	197	int blocksize, char prefix, char volume, unsigned long *mount_opts)
	198	{
	199	char *p;
	200	substring_t args[MAX_OPT_ARGS];
	201
	202	/* Fill in defaults */
	203
21559981 DH	204	*uid = current_uid();
21559981 DH	205	*gid = current_gid();
1da177e4 LT	206	*reserved = 2;
	207	*root = -1;
	208	*blocksize = -1;
	209	volume[0] = ':';
	210	volume[1] = 0;
	211	*mount_opts = 0;
	212	if (!options)
	213	return 1;
	214
	215	while ((p = strsep(&options, ",")) != NULL) {
	216	int token, n, option;
	217	if (!*p)
	218	continue;
	219
	220	token = match_token(p, tokens, args);
	221	switch (token) {
	222	case Opt_bs:
	223	if (match_int(&args[0], &n))
217686e9	224	return 0;
1da177e4 LT	225	if (n != 512 && n != 1024 && n != 2048
	226	&& n != 4096) {
	227	printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
	228	return 0;
	229	}
	230	*blocksize = n;
	231	break;
	232	case Opt_mode:
	233	if (match_octal(&args[0], &option))
217686e9	234	return 0;
1da177e4 LT	235	*mode = option & 0777;
	236	*mount_opts \|= SF_SETMODE;
	237	break;
	238	case Opt_mufs:
	239	*mount_opts \|= SF_MUFS;
	240	break;
	241	case Opt_prefix:
1da177e4 LT	242	*prefix = match_strdup(&args[0]);
	243	if (!*prefix)
	244	return 0;
	245	*mount_opts \|= SF_PREFIX;
	246	break;
	247	case Opt_protect:
	248	*mount_opts \|= SF_IMMUTABLE;
	249	break;
	250	case Opt_reserved:
	251	if (match_int(&args[0], reserved))
217686e9	252	return 0;
1da177e4 LT	253	break;
	254	case Opt_root:
	255	if (match_int(&args[0], root))
217686e9	256	return 0;
1da177e4 LT	257	break;
	258	case Opt_setgid:
	259	if (match_int(&args[0], &option))
217686e9	260	return 0;
8fed10be EB	261	*gid = make_kgid(current_user_ns(), option);
	262	if (!gid_valid(*gid))
	263	return 0;
1da177e4 LT	264	*mount_opts \|= SF_SETGID;
	265	break;
	266	case Opt_setuid:
	267	if (match_int(&args[0], &option))
217686e9	268	return 0;
8fed10be EB	269	*uid = make_kuid(current_user_ns(), option);
	270	if (!uid_valid(*uid))
	271	return 0;
1da177e4 LT	272	*mount_opts \|= SF_SETUID;
	273	break;
	274	case Opt_verbose:
	275	*mount_opts \|= SF_VERBOSE;
	276	break;
	277	case Opt_volume: {
	278	char *vol = match_strdup(&args[0]);
6db27dd9 JM	279	if (!vol)
6db27dd9 JM	280	return 0;
1da177e4 LT	281	strlcpy(volume, vol, 32);
	282	kfree(vol);
	283	break;
	284	}
	285	case Opt_ignore:
	286	/* Silently ignore the quota options */
	287	break;
	288	default:
	289	printk("AFFS: Unrecognized mount option \"%s\" "
	290	"or missing value\n", p);
	291	return 0;
	292	}
	293	}
	294	return 1;
	295	}
	296
	297	/* This function definitely needs to be split up. Some fine day I'll
	298	* hopefully have the guts to do so. Until then: sorry for the mess.
	299	*/
	300
	301	static int affs_fill_super(struct super_block sb, void data, int silent)
	302	{
	303	struct affs_sb_info *sbi;
	304	struct buffer_head *root_bh = NULL;
	305	struct buffer_head *boot_bh;
	306	struct inode *root_inode = NULL;
	307	s32 root_block;
	308	int size, blocksize;
	309	u32 chksum;
	310	int num_bm;
	311	int i, j;
	312	s32 key;
8fed10be EB	313	kuid_t uid;
8fed10be EB	314	kgid_t gid;
1da177e4 LT	315	int reserved;
	316	unsigned long mount_flags;
	317	int tmp_flags; /* fix remount prototype... */
2b943cf0	318	u8 sig[4];
210f8559	319	int ret = -EINVAL;
1da177e4	320
e9b3961b MS	321	save_mount_options(sb, data);
e9b3961b MS	322
1da177e4 LT	323	pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
	324
	325	sb->s_magic = AFFS_SUPER_MAGIC;
	326	sb->s_op = &affs_sops;
	327	sb->s_flags \|= MS_NODIRATIME;
	328
f8314dc6	329	sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
1da177e4 LT	330	if (!sbi)
1da177e4 LT	331	return -ENOMEM;
74c41429	332
1da177e4	333	sb->s_fs_info = sbi;
a215fef7	334	sbi->sb = sb;
7d135a5d	335	mutex_init(&sbi->s_bmlock);
29333920	336	spin_lock_init(&sbi->symlink_lock);
3dd84782 AB	337	spin_lock_init(&sbi->work_lock);
3dd84782 AB	338	INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
1da177e4 LT	339
	340	if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
	341	&blocksize,&sbi->s_prefix,
	342	sbi->s_volume, &mount_flags)) {
	343	printk(KERN_ERR "AFFS: Error parsing options\n");
afc70ed0 AV	344	kfree(sbi->s_prefix);
afc70ed0 AV	345	kfree(sbi);
1da177e4 LT	346	return -EINVAL;
	347	}
	348	/* N.B. after this point s_prefix must be released */
	349
	350	sbi->s_flags = mount_flags;
	351	sbi->s_mode = i;
	352	sbi->s_uid = uid;
	353	sbi->s_gid = gid;
	354	sbi->s_reserved= reserved;
	355
	356	/* Get the size of the device in 512-byte blocks.
	357	* If we later see that the partition uses bigger
	358	* blocks, we will have to change it.
	359	*/
	360
	361	size = sb->s_bdev->bd_inode->i_size >> 9;
	362	pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
	363
	364	affs_set_blocksize(sb, PAGE_SIZE);
	365	/* Try to find root block. Its location depends on the block size. */
	366
	367	i = 512;
	368	j = 4096;
	369	if (blocksize > 0) {
	370	i = j = blocksize;
	371	size = size / (blocksize / 512);
	372	}
	373	for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
	374	sbi->s_root_block = root_block;
	375	if (root_block < 0)
	376	sbi->s_root_block = (reserved + size - 1) / 2;
	377	pr_debug("AFFS: setting blocksize to %d\n", blocksize);
	378	affs_set_blocksize(sb, blocksize);
	379	sbi->s_partition_size = size;
	380
	381	/* The root block location that was calculated above is not
	382	* correct if the partition size is an odd number of 512-
	383	* byte blocks, which will be rounded down to a number of
	384	* 1024-byte blocks, and if there were an even number of
	385	* reserved blocks. Ideally, all partition checkers should
	386	* report the real number of blocks of the real blocksize,
	387	* but since this just cannot be done, we have to try to
	388	* find the root block anyways. In the above case, it is one
	389	* block behind the calculated one. So we check this one, too.
	390	*/
	391	for (num_bm = 0; num_bm < 2; num_bm++) {
	392	pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
	393	"size=%d, reserved=%d\n",
	394	sb->s_id,
	395	sbi->s_root_block + num_bm,
	396	blocksize, size, reserved);
	397	root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
	398	if (!root_bh)
	399	continue;
	400	if (!affs_checksum_block(sb, root_bh) &&
	401	be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
	402	be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
	403	sbi->s_hashsize = blocksize / 4 - 56;
	404	sbi->s_root_block += num_bm;
	405	key = 1;
	406	goto got_root;
	407	}
	408	affs_brelse(root_bh);
	409	root_bh = NULL;
410	}
411	}
412	if (!silent)
413	printk(KERN_ERR "AFFS: No valid root block on device %s\n",
414	sb->s_id);
415	goto out_error;
416
417	/* N.B. after this point bh must be released */
418	got_root:
419	root_block = sbi->s_root_block;
420
421	/* Find out which kind of FS we have */
422	boot_bh = sb_bread(sb, 0);
423	if (!boot_bh) {
424	printk(KERN_ERR "AFFS: Cannot read boot block\n");
425	goto out_error;
426	}
2b943cf0	427	memcpy(sig, boot_bh->b_data, 4);
1da177e4	428	brelse(boot_bh);
2b943cf0	429	chksum = be32_to_cpu((__be32 )sig);
1da177e4 LT	430
	431	/* Dircache filesystems are compatible with non-dircache ones
	432	* when reading. As long as they aren't supported, writing is
	433	* not recommended.
	434	*/
	435	if ((chksum == FS_DCFFS \|\| chksum == MUFS_DCFFS \|\| chksum == FS_DCOFS
	436	\|\| chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
	437	printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
	438	sb->s_id);
	439	sb->s_flags \|= MS_RDONLY;
	440	}
	441	switch (chksum) {
	442	case MUFS_FS:
	443	case MUFS_INTLFFS:
	444	case MUFS_DCFFS:
	445	sbi->s_flags \|= SF_MUFS;
	446	/* fall thru */
	447	case FS_INTLFFS:
	448	case FS_DCFFS:
	449	sbi->s_flags \|= SF_INTL;
	450	break;
	451	case MUFS_FFS:
	452	sbi->s_flags \|= SF_MUFS;
	453	break;
	454	case FS_FFS:
	455	break;
	456	case MUFS_OFS:
	457	sbi->s_flags \|= SF_MUFS;
	458	/* fall thru */
	459	case FS_OFS:
	460	sbi->s_flags \|= SF_OFS;
	461	sb->s_flags \|= MS_NOEXEC;
	462	break;
	463	case MUFS_DCOFS:
	464	case MUFS_INTLOFS:
	465	sbi->s_flags \|= SF_MUFS;
	466	case FS_DCOFS:
	467	case FS_INTLOFS:
	468	sbi->s_flags \|= SF_INTL \| SF_OFS;
	469	sb->s_flags \|= MS_NOEXEC;
	470	break;
	471	default:
	472	printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
	473	sb->s_id, chksum);
	474	goto out_error;
	475	}
	476
	477	if (mount_flags & SF_VERBOSE) {
2b943cf0 AV	478	u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
	479	printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
	480	len > 31 ? 31 : len,
1da177e4	481	AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
2b943cf0	482	sig, sig[3] + '0', blocksize);
1da177e4 LT	483	}
	484
	485	sb->s_flags \|= MS_NODEV \| MS_NOSUID;
	486
	487	sbi->s_data_blksize = sb->s_blocksize;
	488	if (sbi->s_flags & SF_OFS)
	489	sbi->s_data_blksize -= 24;
	490
	491	/* Keep super block in cache */
	492	sbi->s_root_bh = root_bh;
	493	/* N.B. after this point s_root_bh must be released */
	494
	495	tmp_flags = sb->s_flags;
	496	if (affs_init_bitmap(sb, &tmp_flags))
	497	goto out_error;
	498	sb->s_flags = tmp_flags;
	499
	500	/* set up enough so that it can read an inode */
	501
210f8559 DH	502	root_inode = affs_iget(sb, root_block);
	503	if (IS_ERR(root_inode)) {
	504	ret = PTR_ERR(root_inode);
48fde701	505	goto out_error;
210f8559 DH	506	}
210f8559 DH	507
a129880d AV	508	if (AFFS_SB(sb)->s_flags & SF_INTL)
	509	sb->s_d_op = &affs_intl_dentry_operations;
	510	else
	511	sb->s_d_op = &affs_dentry_operations;
	512
48fde701	513	sb->s_root = d_make_root(root_inode);
1da177e4 LT	514	if (!sb->s_root) {
	515	printk(KERN_ERR "AFFS: Get root inode failed\n");
	516	goto out_error;
	517	}
1da177e4 LT	518
	519	pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
	520	return 0;
	521
	522	/*
	523	* Begin the cascaded cleanup ...
	524	*/
	525	out_error:
f99d49ad	526	kfree(sbi->s_bitmap);
1da177e4	527	affs_brelse(root_bh);
f99d49ad	528	kfree(sbi->s_prefix);
1da177e4 LT	529	kfree(sbi);
1da177e4 LT	530	sb->s_fs_info = NULL;
210f8559	531	return ret;
1da177e4 LT	532	}
	533
	534	static int
	535	affs_remount(struct super_block sb, int flags, char *data)
	536	{
	537	struct affs_sb_info *sbi = AFFS_SB(sb);
	538	int blocksize;
8fed10be EB	539	kuid_t uid;
8fed10be EB	540	kgid_t gid;
1da177e4 LT	541	int mode;
	542	int reserved;
	543	int root_block;
	544	unsigned long mount_flags;
	545	int res = 0;
e9b3961b	546	char *new_opts = kstrdup(data, GFP_KERNEL);
29333920 AV	547	char volume[32];
29333920 AV	548	char *prefix = NULL;
1da177e4 LT	549
	550	pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
	551
	552	*flags \|= MS_NODIRATIME;
	553
29333920	554	memcpy(volume, sbi->s_volume, 32);
e9b3961b	555	if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
29333920	556	&blocksize, &prefix, volume,
e9b3961b	557	&mount_flags)) {
29333920	558	kfree(prefix);
e9b3961b	559	kfree(new_opts);
1da177e4	560	return -EINVAL;
e9b3961b	561	}
74c41429	562
43829731	563	flush_delayed_work(&sbi->sb_work);
2a32cebd	564	replace_mount_options(sb, new_opts);
e9b3961b	565
1da177e4 LT	566	sbi->s_flags = mount_flags;
	567	sbi->s_mode = mode;
	568	sbi->s_uid = uid;
	569	sbi->s_gid = gid;
29333920 AV	570	/* protect against readers */
	571	spin_lock(&sbi->symlink_lock);
	572	if (prefix) {
	573	kfree(sbi->s_prefix);
	574	sbi->s_prefix = prefix;
	575	}
	576	memcpy(sbi->s_volume, volume, 32);
	577	spin_unlock(&sbi->symlink_lock);
1da177e4	578
74c41429	579	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
1da177e4	580	return 0;
74c41429	581
0164b1a3	582	if (*flags & MS_RDONLY)
1da177e4	583	affs_free_bitmap(sb);
0164b1a3	584	else
1da177e4 LT	585	res = affs_init_bitmap(sb, flags);
	586
	587	return res;
	588	}
	589
	590	static int
726c3342	591	affs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	592	{
726c3342	593	struct super_block *sb = dentry->d_sb;
1da177e4	594	int free;
a6a2a73c	595	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1da177e4 LT	596
	597	pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
	598	AFFS_SB(sb)->s_reserved);
	599
	600	free = affs_count_free_blocks(sb);
	601	buf->f_type = AFFS_SUPER_MAGIC;
	602	buf->f_bsize = sb->s_blocksize;
	603	buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
	604	buf->f_bfree = free;
	605	buf->f_bavail = free;
a6a2a73c CL	606	buf->f_fsid.val[0] = (u32)id;
	607	buf->f_fsid.val[1] = (u32)(id >> 32);
	608	buf->f_namelen = 30;
1da177e4 LT	609	return 0;
	610	}
	611
152a0836 AV	612	static struct dentry affs_mount(struct file_system_type fs_type,
152a0836 AV	613	int flags, const char dev_name, void data)
1da177e4	614	{
152a0836	615	return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
1da177e4 LT	616	}
	617
	618	static struct file_system_type affs_fs_type = {
	619	.owner = THIS_MODULE,
	620	.name = "affs",
152a0836	621	.mount = affs_mount,
1da177e4 LT	622	.kill_sb = kill_block_super,
	623	.fs_flags = FS_REQUIRES_DEV,
	624	};
7f78e035	625	MODULE_ALIAS_FS("affs");
1da177e4 LT	626
	627	static int __init init_affs_fs(void)
	628	{
	629	int err = init_inodecache();
	630	if (err)
	631	goto out1;
	632	err = register_filesystem(&affs_fs_type);
	633	if (err)
	634	goto out;
	635	return 0;
	636	out:
	637	destroy_inodecache();
	638	out1:
	639	return err;
	640	}
	641
	642	static void __exit exit_affs_fs(void)
	643	{
	644	unregister_filesystem(&affs_fs_type);
	645	destroy_inodecache();
	646	}
	647
	648	MODULE_DESCRIPTION("Amiga filesystem support for Linux");
	649	MODULE_LICENSE("GPL");
	650
	651	module_init(init_affs_fs)
	652	module_exit(exit_affs_fs)