[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 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_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) {
				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_notruncate:
			*mount_opts |= SF_NO_TRUNCATE;
			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);

	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("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	}
1da177e4 LT	130
adbd319e	131	static int __init init_inodecache(void)
1da177e4 LT	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 {
8ca57722	166	Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect,
1da177e4 LT	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"},
8ca57722	175	{Opt_notruncate, "nofilenametruncate"},
1da177e4 LT	176	{Opt_prefix, "prefix=%s"},
	177	{Opt_protect, "protect"},
	178	{Opt_reserved, "reserved=%u"},
	179	{Opt_root, "root=%u"},
	180	{Opt_setgid, "setgid=%u"},
	181	{Opt_setuid, "setuid=%u"},
	182	{Opt_verbose, "verbose"},
	183	{Opt_volume, "volume=%s"},
	184	{Opt_ignore, "grpquota"},
	185	{Opt_ignore, "noquota"},
	186	{Opt_ignore, "quota"},
	187	{Opt_ignore, "usrquota"},
	188	{Opt_err, NULL},
	189	};
	190
	191	static int
8fed10be	192	parse_options(char options, kuid_t uid, kgid_t gid, int mode, int reserved, s32 root,
1da177e4 LT	193	int blocksize, char prefix, char volume, unsigned long *mount_opts)
	194	{
	195	char *p;
	196	substring_t args[MAX_OPT_ARGS];
	197
	198	/* Fill in defaults */
	199
21559981 DH	200	*uid = current_uid();
21559981 DH	201	*gid = current_gid();
1da177e4 LT	202	*reserved = 2;
	203	*root = -1;
	204	*blocksize = -1;
	205	volume[0] = ':';
	206	volume[1] = 0;
	207	*mount_opts = 0;
	208	if (!options)
	209	return 1;
	210
	211	while ((p = strsep(&options, ",")) != NULL) {
	212	int token, n, option;
	213	if (!*p)
	214	continue;
	215
	216	token = match_token(p, tokens, args);
	217	switch (token) {
	218	case Opt_bs:
	219	if (match_int(&args[0], &n))
217686e9	220	return 0;
1da177e4 LT	221	if (n != 512 && n != 1024 && n != 2048
	222	&& n != 4096) {
	223	printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
	224	return 0;
	225	}
	226	*blocksize = n;
	227	break;
	228	case Opt_mode:
	229	if (match_octal(&args[0], &option))
217686e9	230	return 0;
1da177e4 LT	231	*mode = option & 0777;
	232	*mount_opts \|= SF_SETMODE;
	233	break;
	234	case Opt_mufs:
	235	*mount_opts \|= SF_MUFS;
	236	break;
8ca57722 FF	237	case Opt_notruncate:
	238	*mount_opts \|= SF_NO_TRUNCATE;
	239	break;
1da177e4	240	case Opt_prefix:
1da177e4 LT	241	*prefix = match_strdup(&args[0]);
	242	if (!*prefix)
	243	return 0;
	244	*mount_opts \|= SF_PREFIX;
	245	break;
	246	case Opt_protect:
	247	*mount_opts \|= SF_IMMUTABLE;
	248	break;
	249	case Opt_reserved:
	250	if (match_int(&args[0], reserved))
217686e9	251	return 0;
1da177e4 LT	252	break;
	253	case Opt_root:
	254	if (match_int(&args[0], root))
217686e9	255	return 0;
1da177e4 LT	256	break;
	257	case Opt_setgid:
	258	if (match_int(&args[0], &option))
217686e9	259	return 0;
8fed10be EB	260	*gid = make_kgid(current_user_ns(), option);
	261	if (!gid_valid(*gid))
	262	return 0;
1da177e4 LT	263	*mount_opts \|= SF_SETGID;
	264	break;
	265	case Opt_setuid:
	266	if (match_int(&args[0], &option))
217686e9	267	return 0;
8fed10be EB	268	*uid = make_kuid(current_user_ns(), option);
	269	if (!uid_valid(*uid))
	270	return 0;
1da177e4 LT	271	*mount_opts \|= SF_SETUID;
	272	break;
	273	case Opt_verbose:
	274	*mount_opts \|= SF_VERBOSE;
	275	break;
	276	case Opt_volume: {
	277	char *vol = match_strdup(&args[0]);
6db27dd9 JM	278	if (!vol)
6db27dd9 JM	279	return 0;
1da177e4 LT	280	strlcpy(volume, vol, 32);
	281	kfree(vol);
	282	break;
	283	}
	284	case Opt_ignore:
	285	/* Silently ignore the quota options */
	286	break;
	287	default:
	288	printk("AFFS: Unrecognized mount option \"%s\" "
	289	"or missing value\n", p);
	290	return 0;
	291	}
	292	}
	293	return 1;
	294	}
	295
	296	/* This function definitely needs to be split up. Some fine day I'll
	297	* hopefully have the guts to do so. Until then: sorry for the mess.
	298	*/
	299
	300	static int affs_fill_super(struct super_block sb, void data, int silent)
	301	{
	302	struct affs_sb_info *sbi;
	303	struct buffer_head *root_bh = NULL;
	304	struct buffer_head *boot_bh;
	305	struct inode *root_inode = NULL;
	306	s32 root_block;
	307	int size, blocksize;
	308	u32 chksum;
	309	int num_bm;
	310	int i, j;
	311	s32 key;
8fed10be EB	312	kuid_t uid;
8fed10be EB	313	kgid_t gid;
1da177e4 LT	314	int reserved;
	315	unsigned long mount_flags;
	316	int tmp_flags; /* fix remount prototype... */
2b943cf0	317	u8 sig[4];
842a859d	318	int ret;
1da177e4	319
e9b3961b MS	320	save_mount_options(sb, data);
e9b3961b MS	321
1da177e4 LT	322	pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
	323
	324	sb->s_magic = AFFS_SUPER_MAGIC;
	325	sb->s_op = &affs_sops;
	326	sb->s_flags \|= MS_NODIRATIME;
	327
f8314dc6	328	sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
1da177e4 LT	329	if (!sbi)
1da177e4 LT	330	return -ENOMEM;
74c41429	331
1da177e4	332	sb->s_fs_info = sbi;
a215fef7	333	sbi->sb = sb;
7d135a5d	334	mutex_init(&sbi->s_bmlock);
29333920	335	spin_lock_init(&sbi->symlink_lock);
3dd84782 AB	336	spin_lock_init(&sbi->work_lock);
3dd84782 AB	337	INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
1da177e4 LT	338
	339	if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
	340	&blocksize,&sbi->s_prefix,
	341	sbi->s_volume, &mount_flags)) {
	342	printk(KERN_ERR "AFFS: Error parsing options\n");
afc70ed0 AV	343	kfree(sbi->s_prefix);
afc70ed0 AV	344	kfree(sbi);
1da177e4 LT	345	return -EINVAL;
	346	}
	347	/* N.B. after this point s_prefix must be released */
	348
	349	sbi->s_flags = mount_flags;
	350	sbi->s_mode = i;
	351	sbi->s_uid = uid;
	352	sbi->s_gid = gid;
	353	sbi->s_reserved= reserved;
	354
	355	/* Get the size of the device in 512-byte blocks.
	356	* If we later see that the partition uses bigger
	357	* blocks, we will have to change it.
	358	*/
	359
	360	size = sb->s_bdev->bd_inode->i_size >> 9;
	361	pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
	362
	363	affs_set_blocksize(sb, PAGE_SIZE);
	364	/* Try to find root block. Its location depends on the block size. */
	365
	366	i = 512;
	367	j = 4096;
	368	if (blocksize > 0) {
	369	i = j = blocksize;
	370	size = size / (blocksize / 512);
	371	}
	372	for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
	373	sbi->s_root_block = root_block;
	374	if (root_block < 0)
	375	sbi->s_root_block = (reserved + size - 1) / 2;
	376	pr_debug("AFFS: setting blocksize to %d\n", blocksize);
	377	affs_set_blocksize(sb, blocksize);
	378	sbi->s_partition_size = size;
	379
	380	/* The root block location that was calculated above is not
	381	* correct if the partition size is an odd number of 512-
	382	* byte blocks, which will be rounded down to a number of
	383	* 1024-byte blocks, and if there were an even number of
	384	* reserved blocks. Ideally, all partition checkers should
	385	* report the real number of blocks of the real blocksize,
	386	* but since this just cannot be done, we have to try to
	387	* find the root block anyways. In the above case, it is one
	388	* block behind the calculated one. So we check this one, too.
	389	*/
	390	for (num_bm = 0; num_bm < 2; num_bm++) {
	391	pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
	392	"size=%d, reserved=%d\n",
	393	sb->s_id,
	394	sbi->s_root_block + num_bm,
	395	blocksize, size, reserved);
	396	root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
	397	if (!root_bh)
	398	continue;
	399	if (!affs_checksum_block(sb, root_bh) &&
	400	be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
	401	be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
	402	sbi->s_hashsize = blocksize / 4 - 56;
	403	sbi->s_root_block += num_bm;
	404	key = 1;
	405	goto got_root;
	406	}
	407	affs_brelse(root_bh);
	408	root_bh = NULL;
409	}
410	}
411	if (!silent)
412	printk(KERN_ERR "AFFS: No valid root block on device %s\n",
413	sb->s_id);
842a859d	414	return -EINVAL;
1da177e4 LT	415
	416	/* N.B. after this point bh must be released */
	417	got_root:
842a859d AV	418	/* Keep super block in cache */
842a859d AV	419	sbi->s_root_bh = root_bh;
1da177e4 LT	420	root_block = sbi->s_root_block;
	421
	422	/* Find out which kind of FS we have */
	423	boot_bh = sb_bread(sb, 0);
	424	if (!boot_bh) {
	425	printk(KERN_ERR "AFFS: Cannot read boot block\n");
842a859d	426	return -EINVAL;
1da177e4	427	}
2b943cf0	428	memcpy(sig, boot_bh->b_data, 4);
1da177e4	429	brelse(boot_bh);
2b943cf0	430	chksum = be32_to_cpu((__be32 )sig);
1da177e4 LT	431
	432	/* Dircache filesystems are compatible with non-dircache ones
	433	* when reading. As long as they aren't supported, writing is
	434	* not recommended.
	435	*/
	436	if ((chksum == FS_DCFFS \|\| chksum == MUFS_DCFFS \|\| chksum == FS_DCOFS
	437	\|\| chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
	438	printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
	439	sb->s_id);
	440	sb->s_flags \|= MS_RDONLY;
	441	}
	442	switch (chksum) {
	443	case MUFS_FS:
	444	case MUFS_INTLFFS:
	445	case MUFS_DCFFS:
	446	sbi->s_flags \|= SF_MUFS;
	447	/* fall thru */
	448	case FS_INTLFFS:
	449	case FS_DCFFS:
	450	sbi->s_flags \|= SF_INTL;
	451	break;
	452	case MUFS_FFS:
	453	sbi->s_flags \|= SF_MUFS;
	454	break;
	455	case FS_FFS:
	456	break;
	457	case MUFS_OFS:
	458	sbi->s_flags \|= SF_MUFS;
	459	/* fall thru */
	460	case FS_OFS:
	461	sbi->s_flags \|= SF_OFS;
	462	sb->s_flags \|= MS_NOEXEC;
	463	break;
	464	case MUFS_DCOFS:
	465	case MUFS_INTLOFS:
	466	sbi->s_flags \|= SF_MUFS;
	467	case FS_DCOFS:
	468	case FS_INTLOFS:
	469	sbi->s_flags \|= SF_INTL \| SF_OFS;
	470	sb->s_flags \|= MS_NOEXEC;
	471	break;
	472	default:
	473	printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
	474	sb->s_id, chksum);
842a859d	475	return -EINVAL;
1da177e4 LT	476	}
	477
	478	if (mount_flags & SF_VERBOSE) {
2b943cf0 AV	479	u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
	480	printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
	481	len > 31 ? 31 : len,
1da177e4	482	AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
2b943cf0	483	sig, sig[3] + '0', blocksize);
1da177e4 LT	484	}
	485
	486	sb->s_flags \|= MS_NODEV \| MS_NOSUID;
	487
	488	sbi->s_data_blksize = sb->s_blocksize;
	489	if (sbi->s_flags & SF_OFS)
	490	sbi->s_data_blksize -= 24;
	491
1da177e4	492	tmp_flags = sb->s_flags;
842a859d AV	493	ret = affs_init_bitmap(sb, &tmp_flags);
	494	if (ret)
	495	return ret;
1da177e4 LT	496	sb->s_flags = tmp_flags;
	497
	498	/* set up enough so that it can read an inode */
	499
210f8559	500	root_inode = affs_iget(sb, root_block);
842a859d AV	501	if (IS_ERR(root_inode))
842a859d AV	502	return PTR_ERR(root_inode);
210f8559	503
a129880d AV	504	if (AFFS_SB(sb)->s_flags & SF_INTL)
	505	sb->s_d_op = &affs_intl_dentry_operations;
	506	else
	507	sb->s_d_op = &affs_dentry_operations;
	508
48fde701	509	sb->s_root = d_make_root(root_inode);
1da177e4 LT	510	if (!sb->s_root) {
1da177e4 LT	511	printk(KERN_ERR "AFFS: Get root inode failed\n");
842a859d	512	return -ENOMEM;
1da177e4	513	}
1da177e4 LT	514
	515	pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
	516	return 0;
1da177e4 LT	517	}
	518
	519	static int
	520	affs_remount(struct super_block sb, int flags, char *data)
	521	{
	522	struct affs_sb_info *sbi = AFFS_SB(sb);
	523	int blocksize;
8fed10be EB	524	kuid_t uid;
8fed10be EB	525	kgid_t gid;
1da177e4 LT	526	int mode;
	527	int reserved;
	528	int root_block;
	529	unsigned long mount_flags;
	530	int res = 0;
e9b3961b	531	char *new_opts = kstrdup(data, GFP_KERNEL);
29333920 AV	532	char volume[32];
29333920 AV	533	char *prefix = NULL;
1da177e4 LT	534
	535	pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
	536
02b9984d	537	sync_filesystem(sb);
1da177e4 LT	538	*flags \|= MS_NODIRATIME;
1da177e4 LT	539
29333920	540	memcpy(volume, sbi->s_volume, 32);
e9b3961b	541	if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
29333920	542	&blocksize, &prefix, volume,
e9b3961b	543	&mount_flags)) {
29333920	544	kfree(prefix);
e9b3961b	545	kfree(new_opts);
1da177e4	546	return -EINVAL;
e9b3961b	547	}
74c41429	548
43829731	549	flush_delayed_work(&sbi->sb_work);
2a32cebd	550	replace_mount_options(sb, new_opts);
e9b3961b	551
1da177e4 LT	552	sbi->s_flags = mount_flags;
	553	sbi->s_mode = mode;
	554	sbi->s_uid = uid;
	555	sbi->s_gid = gid;
29333920 AV	556	/* protect against readers */
	557	spin_lock(&sbi->symlink_lock);
	558	if (prefix) {
	559	kfree(sbi->s_prefix);
	560	sbi->s_prefix = prefix;
	561	}
	562	memcpy(sbi->s_volume, volume, 32);
	563	spin_unlock(&sbi->symlink_lock);
1da177e4	564
74c41429	565	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
1da177e4	566	return 0;
74c41429	567
0164b1a3	568	if (*flags & MS_RDONLY)
1da177e4	569	affs_free_bitmap(sb);
0164b1a3	570	else
1da177e4 LT	571	res = affs_init_bitmap(sb, flags);
	572
	573	return res;
	574	}
	575
	576	static int
726c3342	577	affs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	578	{
726c3342	579	struct super_block *sb = dentry->d_sb;
1da177e4	580	int free;
a6a2a73c	581	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1da177e4 LT	582
	583	pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
	584	AFFS_SB(sb)->s_reserved);
	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;
	593	buf->f_fsid.val[1] = (u32)(id >> 32);
	594	buf->f_namelen = 30;
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);
	612	kfree(sbi);
	613	}
	614	}
	615
1da177e4 LT	616	static struct file_system_type affs_fs_type = {
	617	.owner = THIS_MODULE,
	618	.name = "affs",
152a0836	619	.mount = affs_mount,
842a859d	620	.kill_sb = affs_kill_sb,
1da177e4 LT	621	.fs_flags = FS_REQUIRES_DEV,
1da177e4 LT	622	};
7f78e035	623	MODULE_ALIAS_FS("affs");
1da177e4 LT	624
	625	static int __init init_affs_fs(void)
	626	{
	627	int err = init_inodecache();
	628	if (err)
	629	goto out1;
	630	err = register_filesystem(&affs_fs_type);
	631	if (err)
	632	goto out;
	633	return 0;
	634	out:
	635	destroy_inodecache();
	636	out1:
	637	return err;
	638	}
	639
	640	static void __exit exit_affs_fs(void)
	641	{
	642	unregister_filesystem(&affs_fs_type);
	643	destroy_inodecache();
	644	}
	645
	646	MODULE_DESCRIPTION("Amiga filesystem support for Linux");
	647	MODULE_LICENSE("GPL");
	648
	649	module_init(init_affs_fs)
	650	module_exit(exit_affs_fs)