[net-next-2.6.git] / fs / bfs / inode.c

/*
 *	fs/bfs/inode.c
 *	BFS superblock and inode operations.
 *	Copyright (C) 1999-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
 *	From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds.
 *
 *      Made endianness-clean by Andrew Stribblehill <ads@wompom.org>, 2005.
 */

#include <linux/module.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
#include <linux/vfs.h>
#include <asm/uaccess.h>
#include "bfs.h"

MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>");
MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux");
MODULE_LICENSE("GPL");

#undef DEBUG

#ifdef DEBUG
#define dprintf(x...)	printf(x)
#else
#define dprintf(x...)
#endif

static void bfs_write_super(struct super_block *s);
void dump_imap(const char *prefix, struct super_block *s);

struct inode *bfs_iget(struct super_block *sb, unsigned long ino)
{
	struct bfs_inode *di;
	struct inode *inode;
	struct buffer_head *bh;
	int block, off;

	inode = iget_locked(sb, ino);
	if (IS_ERR(inode))
		return ERR_PTR(-ENOMEM);
	if (!(inode->i_state & I_NEW))
		return inode;

	if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) {
		printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino);
		goto error;
	}

	block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
	bh = sb_bread(inode->i_sb, block);
	if (!bh) {
		printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id,
									ino);
		goto error;
	}

	off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
	di = (struct bfs_inode *)bh->b_data + off;

	inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode);
	if (le32_to_cpu(di->i_vtype) == BFS_VDIR) {
		inode->i_mode |= S_IFDIR;
		inode->i_op = &bfs_dir_inops;
		inode->i_fop = &bfs_dir_operations;
	} else if (le32_to_cpu(di->i_vtype) == BFS_VREG) {
		inode->i_mode |= S_IFREG;
		inode->i_op = &bfs_file_inops;
		inode->i_fop = &bfs_file_operations;
		inode->i_mapping->a_ops = &bfs_aops;
	}

	BFS_I(inode)->i_sblock =  le32_to_cpu(di->i_sblock);
	BFS_I(inode)->i_eblock =  le32_to_cpu(di->i_eblock);
	BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino);
	inode->i_uid =  le32_to_cpu(di->i_uid);
	inode->i_gid =  le32_to_cpu(di->i_gid);
	inode->i_nlink =  le32_to_cpu(di->i_nlink);
	inode->i_size = BFS_FILESIZE(di);
	inode->i_blocks = BFS_FILEBLOCKS(di);
	inode->i_atime.tv_sec =  le32_to_cpu(di->i_atime);
	inode->i_mtime.tv_sec =  le32_to_cpu(di->i_mtime);
	inode->i_ctime.tv_sec =  le32_to_cpu(di->i_ctime);
	inode->i_atime.tv_nsec = 0;
	inode->i_mtime.tv_nsec = 0;
	inode->i_ctime.tv_nsec = 0;

	brelse(bh);
	unlock_new_inode(inode);
	return inode;

error:
	iget_failed(inode);
	return ERR_PTR(-EIO);
}

static int bfs_write_inode(struct inode *inode, int wait)
{
	struct bfs_sb_info *info = BFS_SB(inode->i_sb);
	unsigned int ino = (u16)inode->i_ino;
        unsigned long i_sblock;
	struct bfs_inode *di;
	struct buffer_head *bh;
	int block, off;
	int err = 0;

        dprintf("ino=%08x\n", ino);

	if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) {
		printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino);
		return -EIO;
	}

	mutex_lock(&info->bfs_lock);
	block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
	bh = sb_bread(inode->i_sb, block);
	if (!bh) {
		printf("Unable to read inode %s:%08x\n",
				inode->i_sb->s_id, ino);
		mutex_unlock(&info->bfs_lock);
		return -EIO;
	}

	off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
	di = (struct bfs_inode *)bh->b_data + off;

	if (ino == BFS_ROOT_INO)
		di->i_vtype = cpu_to_le32(BFS_VDIR);
	else
		di->i_vtype = cpu_to_le32(BFS_VREG);

	di->i_ino = cpu_to_le16(ino);
	di->i_mode = cpu_to_le32(inode->i_mode);
	di->i_uid = cpu_to_le32(inode->i_uid);
	di->i_gid = cpu_to_le32(inode->i_gid);
	di->i_nlink = cpu_to_le32(inode->i_nlink);
	di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
	di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
	di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
        i_sblock = BFS_I(inode)->i_sblock;
	di->i_sblock = cpu_to_le32(i_sblock);
	di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
	di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);

	mark_buffer_dirty(bh);
	if (wait) {
		sync_dirty_buffer(bh);
		if (buffer_req(bh) && !buffer_uptodate(bh))
			err = -EIO;
	}
	brelse(bh);
	mutex_unlock(&info->bfs_lock);
	return err;
}

static void bfs_delete_inode(struct inode *inode)
{
	unsigned long ino = inode->i_ino;
	struct bfs_inode *di;
	struct buffer_head *bh;
	int block, off;
	struct super_block *s = inode->i_sb;
	struct bfs_sb_info *info = BFS_SB(s);
	struct bfs_inode_info *bi = BFS_I(inode);

	dprintf("ino=%08lx\n", ino);

	truncate_inode_pages(&inode->i_data, 0);

	if ((ino < BFS_ROOT_INO) || (ino > info->si_lasti)) {
		printf("invalid ino=%08lx\n", ino);
		return;
	}
	
	inode->i_size = 0;
	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
	mutex_lock(&info->bfs_lock);
	mark_inode_dirty(inode);

	block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
	bh = sb_bread(s, block);
	if (!bh) {
		printf("Unable to read inode %s:%08lx\n",
					inode->i_sb->s_id, ino);
		mutex_unlock(&info->bfs_lock);
		return;
	}
	off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
	di = (struct bfs_inode *)bh->b_data + off;
	memset((void *)di, 0, sizeof(struct bfs_inode));
	mark_buffer_dirty(bh);
	brelse(bh);

        if (bi->i_dsk_ino) {
		if (bi->i_sblock)
			info->si_freeb += bi->i_eblock + 1 - bi->i_sblock;
		info->si_freei++;
		clear_bit(ino, info->si_imap);
		dump_imap("delete_inode", s);
        }

	/*
	 * If this was the last file, make the previous block
	 * "last block of the last file" even if there is no
	 * real file there, saves us 1 gap.
	 */
	if (info->si_lf_eblk == bi->i_eblock) {
		info->si_lf_eblk = bi->i_sblock - 1;
		mark_buffer_dirty(info->si_sbh);
	}
	mutex_unlock(&info->bfs_lock);
	clear_inode(inode);
}

static int bfs_sync_fs(struct super_block *sb, int wait)
{
	struct bfs_sb_info *info = BFS_SB(sb);

	mutex_lock(&info->bfs_lock);
	mark_buffer_dirty(info->si_sbh);
	sb->s_dirt = 0;
	mutex_unlock(&info->bfs_lock);

	return 0;
}

static void bfs_write_super(struct super_block *sb)
{
	if (!(sb->s_flags & MS_RDONLY))
		bfs_sync_fs(sb, 1);
	else
		sb->s_dirt = 0;
}

static void bfs_put_super(struct super_block *s)
{
	struct bfs_sb_info *info = BFS_SB(s);

	if (!info)
		return;

	lock_kernel();

	if (s->s_dirt)
		bfs_write_super(s);

	brelse(info->si_sbh);
	mutex_destroy(&info->bfs_lock);
	kfree(info->si_imap);
	kfree(info);
	s->s_fs_info = NULL;

	unlock_kernel();
}

static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct super_block *s = dentry->d_sb;
	struct bfs_sb_info *info = BFS_SB(s);
	u64 id = huge_encode_dev(s->s_bdev->bd_dev);
	buf->f_type = BFS_MAGIC;
	buf->f_bsize = s->s_blocksize;
	buf->f_blocks = info->si_blocks;
	buf->f_bfree = buf->f_bavail = info->si_freeb;
	buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
	buf->f_ffree = info->si_freei;
	buf->f_fsid.val[0] = (u32)id;
	buf->f_fsid.val[1] = (u32)(id >> 32);
	buf->f_namelen = BFS_NAMELEN;
	return 0;
}

static struct kmem_cache *bfs_inode_cachep;

static struct inode *bfs_alloc_inode(struct super_block *sb)
{
	struct bfs_inode_info *bi;
	bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL);
	if (!bi)
		return NULL;
	return &bi->vfs_inode;
}

static void bfs_destroy_inode(struct inode *inode)
{
	kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
}

static void init_once(void *foo)
{
	struct bfs_inode_info *bi = foo;

	inode_init_once(&bi->vfs_inode);
}

static int init_inodecache(void)
{
	bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
					     sizeof(struct bfs_inode_info),
					     0, (SLAB_RECLAIM_ACCOUNT|
						SLAB_MEM_SPREAD),
					     init_once);
	if (bfs_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
	kmem_cache_destroy(bfs_inode_cachep);
}

static const struct super_operations bfs_sops = {
	.alloc_inode	= bfs_alloc_inode,
	.destroy_inode	= bfs_destroy_inode,
	.write_inode	= bfs_write_inode,
	.delete_inode	= bfs_delete_inode,
	.put_super	= bfs_put_super,
	.write_super	= bfs_write_super,
	.sync_fs	= bfs_sync_fs,
	.statfs		= bfs_statfs,
};

void dump_imap(const char *prefix, struct super_block *s)
{
#ifdef DEBUG
	int i;
	char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL);

	if (!tmpbuf)
		return;
	for (i = BFS_SB(s)->si_lasti; i >= 0; i--) {
		if (i > PAGE_SIZE - 100) break;
		if (test_bit(i, BFS_SB(s)->si_imap))
			strcat(tmpbuf, "1");
		else
			strcat(tmpbuf, "0");
	}
	printf("BFS-fs: %s: lasti=%08lx <%s>\n",
				prefix, BFS_SB(s)->si_lasti, tmpbuf);
	free_page((unsigned long)tmpbuf);
#endif
}

static int bfs_fill_super(struct super_block *s, void *data, int silent)
{
	struct buffer_head *bh;
	struct bfs_super_block *bfs_sb;
	struct inode *inode;
	unsigned i, imap_len;
	struct bfs_sb_info *info;
	int ret = -EINVAL;
	unsigned long i_sblock, i_eblock, i_eoff, s_size;

	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;
	mutex_init(&info->bfs_lock);
	s->s_fs_info = info;

	sb_set_blocksize(s, BFS_BSIZE);

	info->si_sbh = sb_bread(s, 0);
	if (!info->si_sbh)
		goto out;
	bfs_sb = (struct bfs_super_block *)info->si_sbh->b_data;
	if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
		if (!silent)
			printf("No BFS filesystem on %s (magic=%08x)\n", 
				s->s_id,  le32_to_cpu(bfs_sb->s_magic));
		goto out1;
	}
	if (BFS_UNCLEAN(bfs_sb, s) && !silent)
		printf("%s is unclean, continuing\n", s->s_id);

	s->s_magic = BFS_MAGIC;

	if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) {
		printf("Superblock is corrupted\n");
		goto out1;
	}

	info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
					sizeof(struct bfs_inode)
					+ BFS_ROOT_INO - 1;
	imap_len = (info->si_lasti / 8) + 1;
	info->si_imap = kzalloc(imap_len, GFP_KERNEL);
	if (!info->si_imap)
		goto out1;
	for (i = 0; i < BFS_ROOT_INO; i++)
		set_bit(i, info->si_imap);

	s->s_op = &bfs_sops;
	inode = bfs_iget(s, BFS_ROOT_INO);
	if (IS_ERR(inode)) {
		ret = PTR_ERR(inode);
		goto out2;
	}
	s->s_root = d_alloc_root(inode);
	if (!s->s_root) {
		iput(inode);
		ret = -ENOMEM;
		goto out2;
	}

	info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
	info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1
			- le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
	info->si_freei = 0;
	info->si_lf_eblk = 0;

	/* can we read the last block? */
	bh = sb_bread(s, info->si_blocks - 1);
	if (!bh) {
		printf("Last block not available: %lu\n", info->si_blocks - 1);
		ret = -EIO;
		goto out3;
	}
	brelse(bh);

	bh = NULL;
	for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
		struct bfs_inode *di;
		int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
		int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
		unsigned long eblock;

		if (!off) {
			brelse(bh);
			bh = sb_bread(s, block);
		}

		if (!bh)
			continue;

		di = (struct bfs_inode *)bh->b_data + off;

		/* test if filesystem is not corrupted */

		i_eoff = le32_to_cpu(di->i_eoffset);
		i_sblock = le32_to_cpu(di->i_sblock);
		i_eblock = le32_to_cpu(di->i_eblock);
		s_size = le32_to_cpu(bfs_sb->s_end);

		if (i_sblock > info->si_blocks ||
			i_eblock > info->si_blocks ||
			i_sblock > i_eblock ||
			i_eoff > s_size ||
			i_sblock * BFS_BSIZE > i_eoff) {

			printf("Inode 0x%08x corrupted\n", i);

			brelse(bh);
			ret = -EIO;
			goto out3;
		}

		if (!di->i_ino) {
			info->si_freei++;
			continue;
		}
		set_bit(i, info->si_imap);
		info->si_freeb -= BFS_FILEBLOCKS(di);

		eblock =  le32_to_cpu(di->i_eblock);
		if (eblock > info->si_lf_eblk)
			info->si_lf_eblk = eblock;
	}
	brelse(bh);
	if (!(s->s_flags & MS_RDONLY)) {
		mark_buffer_dirty(info->si_sbh);
		s->s_dirt = 1;
	} 
	dump_imap("read_super", s);
	return 0;

out3:
	dput(s->s_root);
	s->s_root = NULL;
out2:
	kfree(info->si_imap);
out1:
	brelse(info->si_sbh);
out:
	mutex_destroy(&info->bfs_lock);
	kfree(info);
	s->s_fs_info = NULL;
	return ret;
}

static int bfs_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
	return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt);
}

static struct file_system_type bfs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "bfs",
	.get_sb		= bfs_get_sb,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};

static int __init init_bfs_fs(void)
{
	int err = init_inodecache();
	if (err)
		goto out1;
        err = register_filesystem(&bfs_fs_type);
	if (err)
		goto out;
	return 0;
out:
	destroy_inodecache();
out1:
	return err;
}

static void __exit exit_bfs_fs(void)
{
	unregister_filesystem(&bfs_fs_type);
	destroy_inodecache();
}

module_init(init_bfs_fs)
module_exit(exit_bfs_fs)
Commit	Line	Data
1da177e4 LT	1	/*
	2	* fs/bfs/inode.c
	3	* BFS superblock and inode operations.
69688262	4	* Copyright (C) 1999-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
1da177e4	5	* From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds.
fac92bec AS	6	*
fac92bec AS	7	* Made endianness-clean by Andrew Stribblehill <ads@wompom.org>, 2005.
1da177e4 LT	8	*/
	9
	10	#include <linux/module.h>
	11	#include <linux/mm.h>
	12	#include <linux/slab.h>
	13	#include <linux/init.h>
	14	#include <linux/fs.h>
	15	#include <linux/smp_lock.h>
	16	#include <linux/buffer_head.h>
	17	#include <linux/vfs.h>
	18	#include <asm/uaccess.h>
	19	#include "bfs.h"
	20
69688262	21	MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>");
1da177e4 LT	22	MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux");
	23	MODULE_LICENSE("GPL");
	24
	25	#undef DEBUG
	26
	27	#ifdef DEBUG
	28	#define dprintf(x...) printf(x)
	29	#else
	30	#define dprintf(x...)
	31	#endif
	32
8c85e125	33	static void bfs_write_super(struct super_block *s);
f433dc56	34	void dump_imap(const char prefix, struct super_block s);
1da177e4	35
e33ab086	36	struct inode bfs_iget(struct super_block sb, unsigned long ino)
1da177e4	37	{
f433dc56	38	struct bfs_inode *di;
e33ab086	39	struct inode *inode;
f433dc56	40	struct buffer_head *bh;
1da177e4 LT	41	int block, off;
1da177e4 LT	42
e33ab086 DH	43	inode = iget_locked(sb, ino);
	44	if (IS_ERR(inode))
	45	return ERR_PTR(-ENOMEM);
	46	if (!(inode->i_state & I_NEW))
	47	return inode;
	48
f433dc56	49	if ((ino < BFS_ROOT_INO) \|\| (ino > BFS_SB(inode->i_sb)->si_lasti)) {
1da177e4	50	printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino);
e33ab086	51	goto error;
1da177e4 LT	52	}
1da177e4 LT	53
f433dc56	54	block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
1da177e4 LT	55	bh = sb_bread(inode->i_sb, block);
1da177e4 LT	56	if (!bh) {
f433dc56 DV	57	printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id,
f433dc56 DV	58	ino);
e33ab086	59	goto error;
1da177e4 LT	60	}
	61
	62	off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
	63	di = (struct bfs_inode *)bh->b_data + off;
	64
f433dc56	65	inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode);
fac92bec	66	if (le32_to_cpu(di->i_vtype) == BFS_VDIR) {
1da177e4 LT	67	inode->i_mode \|= S_IFDIR;
	68	inode->i_op = &bfs_dir_inops;
	69	inode->i_fop = &bfs_dir_operations;
fac92bec	70	} else if (le32_to_cpu(di->i_vtype) == BFS_VREG) {
1da177e4 LT	71	inode->i_mode \|= S_IFREG;
	72	inode->i_op = &bfs_file_inops;
	73	inode->i_fop = &bfs_file_operations;
	74	inode->i_mapping->a_ops = &bfs_aops;
	75	}
	76
fac92bec AS	77	BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock);
fac92bec AS	78	BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock);
f433dc56	79	BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino);
fac92bec AS	80	inode->i_uid = le32_to_cpu(di->i_uid);
	81	inode->i_gid = le32_to_cpu(di->i_gid);
	82	inode->i_nlink = le32_to_cpu(di->i_nlink);
1da177e4 LT	83	inode->i_size = BFS_FILESIZE(di);
1da177e4 LT	84	inode->i_blocks = BFS_FILEBLOCKS(di);
fac92bec AS	85	inode->i_atime.tv_sec = le32_to_cpu(di->i_atime);
	86	inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime);
	87	inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime);
1da177e4 LT	88	inode->i_atime.tv_nsec = 0;
	89	inode->i_mtime.tv_nsec = 0;
	90	inode->i_ctime.tv_nsec = 0;
1da177e4 LT	91
1da177e4 LT	92	brelse(bh);
e33ab086 DH	93	unlock_new_inode(inode);
	94	return inode;
	95
	96	error:
	97	iget_failed(inode);
	98	return ERR_PTR(-EIO);
1da177e4 LT	99	}
1da177e4 LT	100
4427f0c3	101	static int bfs_write_inode(struct inode *inode, int wait)
1da177e4	102	{
4427f0c3	103	struct bfs_sb_info *info = BFS_SB(inode->i_sb);
fac92bec AS	104	unsigned int ino = (u16)inode->i_ino;
fac92bec AS	105	unsigned long i_sblock;
f433dc56 DV	106	struct bfs_inode *di;
f433dc56 DV	107	struct buffer_head *bh;
1da177e4	108	int block, off;
4427f0c3	109	int err = 0;
1da177e4	110
fac92bec AS	111	dprintf("ino=%08x\n", ino);
fac92bec AS	112
f433dc56	113	if ((ino < BFS_ROOT_INO) \|\| (ino > BFS_SB(inode->i_sb)->si_lasti)) {
fac92bec	114	printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino);
1da177e4 LT	115	return -EIO;
	116	}
	117
3f165e4c	118	mutex_lock(&info->bfs_lock);
f433dc56	119	block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
1da177e4 LT	120	bh = sb_bread(inode->i_sb, block);
1da177e4 LT	121	if (!bh) {
f433dc56 DV	122	printf("Unable to read inode %s:%08x\n",
f433dc56 DV	123	inode->i_sb->s_id, ino);
3f165e4c	124	mutex_unlock(&info->bfs_lock);
1da177e4 LT	125	return -EIO;
	126	}
	127
f433dc56	128	off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
1da177e4 LT	129	di = (struct bfs_inode *)bh->b_data + off;
1da177e4 LT	130
fac92bec AS	131	if (ino == BFS_ROOT_INO)
fac92bec AS	132	di->i_vtype = cpu_to_le32(BFS_VDIR);
1da177e4	133	else
fac92bec AS	134	di->i_vtype = cpu_to_le32(BFS_VREG);
	135
	136	di->i_ino = cpu_to_le16(ino);
	137	di->i_mode = cpu_to_le32(inode->i_mode);
	138	di->i_uid = cpu_to_le32(inode->i_uid);
	139	di->i_gid = cpu_to_le32(inode->i_gid);
	140	di->i_nlink = cpu_to_le32(inode->i_nlink);
	141	di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
	142	di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
	143	di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
	144	i_sblock = BFS_I(inode)->i_sblock;
	145	di->i_sblock = cpu_to_le32(i_sblock);
	146	di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
	147	di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);
1da177e4 LT	148
1da177e4 LT	149	mark_buffer_dirty(bh);
4427f0c3 AV	150	if (wait) {
	151	sync_dirty_buffer(bh);
	152	if (buffer_req(bh) && !buffer_uptodate(bh))
	153	err = -EIO;
	154	}
1da177e4	155	brelse(bh);
3f165e4c	156	mutex_unlock(&info->bfs_lock);
4427f0c3	157	return err;
1da177e4 LT	158	}
1da177e4 LT	159
f433dc56	160	static void bfs_delete_inode(struct inode *inode)
1da177e4 LT	161	{
1da177e4 LT	162	unsigned long ino = inode->i_ino;
f433dc56 DV	163	struct bfs_inode *di;
f433dc56 DV	164	struct buffer_head *bh;
1da177e4	165	int block, off;
f433dc56 DV	166	struct super_block *s = inode->i_sb;
	167	struct bfs_sb_info *info = BFS_SB(s);
	168	struct bfs_inode_info *bi = BFS_I(inode);
1da177e4	169
fac92bec	170	dprintf("ino=%08lx\n", ino);
1da177e4	171
fef26658 MF	172	truncate_inode_pages(&inode->i_data, 0);
fef26658 MF	173
f433dc56	174	if ((ino < BFS_ROOT_INO) \|\| (ino > info->si_lasti)) {
fac92bec	175	printf("invalid ino=%08lx\n", ino);
1da177e4 LT	176	return;
	177	}
	178
	179	inode->i_size = 0;
	180	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
3f165e4c	181	mutex_lock(&info->bfs_lock);
1da177e4	182	mark_inode_dirty(inode);
f433dc56 DV	183
f433dc56 DV	184	block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
1da177e4 LT	185	bh = sb_bread(s, block);
1da177e4 LT	186	if (!bh) {
f433dc56 DV	187	printf("Unable to read inode %s:%08lx\n",
f433dc56 DV	188	inode->i_sb->s_id, ino);
3f165e4c	189	mutex_unlock(&info->bfs_lock);
1da177e4 LT	190	return;
1da177e4 LT	191	}
f433dc56 DV	192	off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
	193	di = (struct bfs_inode *)bh->b_data + off;
	194	memset((void *)di, 0, sizeof(struct bfs_inode));
	195	mark_buffer_dirty(bh);
	196	brelse(bh);
	197
fac92bec	198	if (bi->i_dsk_ino) {
7e46aa5c AV	199	if (bi->i_sblock)
7e46aa5c AV	200	info->si_freeb += bi->i_eblock + 1 - bi->i_sblock;
1da177e4	201	info->si_freei++;
fac92bec	202	clear_bit(ino, info->si_imap);
1da177e4	203	dump_imap("delete_inode", s);
fac92bec	204	}
1da177e4	205
f433dc56 DV	206	/*
	207	* If this was the last file, make the previous block
	208	* "last block of the last file" even if there is no
	209	* real file there, saves us 1 gap.
	210	*/
	211	if (info->si_lf_eblk == bi->i_eblock) {
	212	info->si_lf_eblk = bi->i_sblock - 1;
1da177e4 LT	213	mark_buffer_dirty(info->si_sbh);
1da177e4 LT	214	}
3f165e4c	215	mutex_unlock(&info->bfs_lock);
1da177e4 LT	216	clear_inode(inode);
	217	}
	218
561e47ce CH	219	static int bfs_sync_fs(struct super_block *sb, int wait)
	220	{
	221	struct bfs_sb_info *info = BFS_SB(sb);
	222
	223	mutex_lock(&info->bfs_lock);
	224	mark_buffer_dirty(info->si_sbh);
	225	sb->s_dirt = 0;
	226	mutex_unlock(&info->bfs_lock);
	227
	228	return 0;
	229	}
	230
	231	static void bfs_write_super(struct super_block *sb)
	232	{
	233	if (!(sb->s_flags & MS_RDONLY))
	234	bfs_sync_fs(sb, 1);
	235	else
	236	sb->s_dirt = 0;
	237	}
	238
1da177e4 LT	239	static void bfs_put_super(struct super_block *s)
	240	{
	241	struct bfs_sb_info *info = BFS_SB(s);
3f165e4c	242
e1f89ec9 ES	243	if (!info)
	244	return;
	245
6cfd0148 CH	246	lock_kernel();
6cfd0148 CH	247
8c85e125 CH	248	if (s->s_dirt)
	249	bfs_write_super(s);
	250
1da177e4	251	brelse(info->si_sbh);
3f165e4c	252	mutex_destroy(&info->bfs_lock);
1da177e4 LT	253	kfree(info->si_imap);
	254	kfree(info);
	255	s->s_fs_info = NULL;
6cfd0148 CH	256
6cfd0148 CH	257	unlock_kernel();
1da177e4 LT	258	}
1da177e4 LT	259
726c3342	260	static int bfs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	261	{
726c3342	262	struct super_block *s = dentry->d_sb;
1da177e4 LT	263	struct bfs_sb_info *info = BFS_SB(s);
	264	u64 id = huge_encode_dev(s->s_bdev->bd_dev);
	265	buf->f_type = BFS_MAGIC;
	266	buf->f_bsize = s->s_blocksize;
	267	buf->f_blocks = info->si_blocks;
	268	buf->f_bfree = buf->f_bavail = info->si_freeb;
	269	buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
	270	buf->f_ffree = info->si_freei;
	271	buf->f_fsid.val[0] = (u32)id;
	272	buf->f_fsid.val[1] = (u32)(id >> 32);
	273	buf->f_namelen = BFS_NAMELEN;
	274	return 0;
	275	}
	276
f433dc56	277	static struct kmem_cache *bfs_inode_cachep;
1da177e4 LT	278
	279	static struct inode bfs_alloc_inode(struct super_block sb)
	280	{
	281	struct bfs_inode_info *bi;
e94b1766	282	bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL);
1da177e4 LT	283	if (!bi)
	284	return NULL;
	285	return &bi->vfs_inode;
	286	}
	287
	288	static void bfs_destroy_inode(struct inode *inode)
	289	{
	290	kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
	291	}
	292
51cc5068	293	static void init_once(void *foo)
1da177e4 LT	294	{
	295	struct bfs_inode_info *bi = foo;
	296
a35afb83	297	inode_init_once(&bi->vfs_inode);
1da177e4	298	}
20c2df83	299
1da177e4 LT	300	static int init_inodecache(void)
	301	{
	302	bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
	303	sizeof(struct bfs_inode_info),
fffb60f9 PJ	304	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	305	SLAB_MEM_SPREAD),
20c2df83	306	init_once);
1da177e4 LT	307	if (bfs_inode_cachep == NULL)
	308	return -ENOMEM;
	309	return 0;
	310	}
	311
	312	static void destroy_inodecache(void)
	313	{
1a1d92c1	314	kmem_cache_destroy(bfs_inode_cachep);
1da177e4 LT	315	}
1da177e4 LT	316
ee9b6d61	317	static const struct super_operations bfs_sops = {
1da177e4 LT	318	.alloc_inode = bfs_alloc_inode,
1da177e4 LT	319	.destroy_inode = bfs_destroy_inode,
1da177e4 LT	320	.write_inode = bfs_write_inode,
	321	.delete_inode = bfs_delete_inode,
	322	.put_super = bfs_put_super,
	323	.write_super = bfs_write_super,
561e47ce	324	.sync_fs = bfs_sync_fs,
1da177e4 LT	325	.statfs = bfs_statfs,
	326	};
	327
f433dc56	328	void dump_imap(const char prefix, struct super_block s)
1da177e4	329	{
fac92bec	330	#ifdef DEBUG
1da177e4 LT	331	int i;
	332	char tmpbuf = (char )get_zeroed_page(GFP_KERNEL);
	333
	334	if (!tmpbuf)
	335	return;
f433dc56 DV	336	for (i = BFS_SB(s)->si_lasti; i >= 0; i--) {
f433dc56 DV	337	if (i > PAGE_SIZE - 100) break;
1da177e4 LT	338	if (test_bit(i, BFS_SB(s)->si_imap))
	339	strcat(tmpbuf, "1");
	340	else
	341	strcat(tmpbuf, "0");
	342	}
f433dc56 DV	343	printf("BFS-fs: %s: lasti=%08lx <%s>\n",
f433dc56 DV	344	prefix, BFS_SB(s)->si_lasti, tmpbuf);
1da177e4 LT	345	free_page((unsigned long)tmpbuf);
	346	#endif
	347	}
	348
	349	static int bfs_fill_super(struct super_block s, void data, int silent)
	350	{
f433dc56 DV	351	struct buffer_head *bh;
	352	struct bfs_super_block *bfs_sb;
	353	struct inode *inode;
fac92bec	354	unsigned i, imap_len;
f433dc56	355	struct bfs_sb_info *info;
5998649f	356	int ret = -EINVAL;
e1f89ec9	357	unsigned long i_sblock, i_eblock, i_eoff, s_size;
1da177e4	358
f8314dc6	359	info = kzalloc(sizeof(*info), GFP_KERNEL);
1da177e4 LT	360	if (!info)
1da177e4 LT	361	return -ENOMEM;
5998649f	362	mutex_init(&info->bfs_lock);
1da177e4	363	s->s_fs_info = info;
1da177e4 LT	364
	365	sb_set_blocksize(s, BFS_BSIZE);
	366
5998649f AV	367	info->si_sbh = sb_bread(s, 0);
5998649f AV	368	if (!info->si_sbh)
1da177e4	369	goto out;
5998649f	370	bfs_sb = (struct bfs_super_block *)info->si_sbh->b_data;
fac92bec	371	if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
1da177e4 LT	372	if (!silent)
1da177e4 LT	373	printf("No BFS filesystem on %s (magic=%08x)\n",
fac92bec	374	s->s_id, le32_to_cpu(bfs_sb->s_magic));
5998649f	375	goto out1;
1da177e4 LT	376	}
	377	if (BFS_UNCLEAN(bfs_sb, s) && !silent)
	378	printf("%s is unclean, continuing\n", s->s_id);
	379
	380	s->s_magic = BFS_MAGIC;
e1f89ec9 ES	381
	382	if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) {
	383	printf("Superblock is corrupted\n");
5998649f	384	goto out1;
e1f89ec9 ES	385	}
e1f89ec9 ES	386
f433dc56 DV	387	info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
	388	sizeof(struct bfs_inode)
	389	+ BFS_ROOT_INO - 1;
	390	imap_len = (info->si_lasti / 8) + 1;
f8314dc6	391	info->si_imap = kzalloc(imap_len, GFP_KERNEL);
1da177e4	392	if (!info->si_imap)
5998649f	393	goto out1;
f433dc56	394	for (i = 0; i < BFS_ROOT_INO; i++)
1da177e4 LT	395	set_bit(i, info->si_imap);
	396
	397	s->s_op = &bfs_sops;
e33ab086 DH	398	inode = bfs_iget(s, BFS_ROOT_INO);
	399	if (IS_ERR(inode)) {
	400	ret = PTR_ERR(inode);
5998649f	401	goto out2;
1da177e4 LT	402	}
	403	s->s_root = d_alloc_root(inode);
	404	if (!s->s_root) {
	405	iput(inode);
e33ab086	406	ret = -ENOMEM;
5998649f	407	goto out2;
1da177e4 LT	408	}
1da177e4 LT	409
f433dc56 DV	410	info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
	411	info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1
	412	- le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
1da177e4 LT	413	info->si_freei = 0;
1da177e4 LT	414	info->si_lf_eblk = 0;
50682bb4 ES	415
	416	/* can we read the last block? */
	417	bh = sb_bread(s, info->si_blocks - 1);
	418	if (!bh) {
	419	printf("Last block not available: %lu\n", info->si_blocks - 1);
50682bb4	420	ret = -EIO;
5998649f	421	goto out3;
50682bb4 ES	422	}
	423	brelse(bh);
	424
c2b513df	425	bh = NULL;
f433dc56	426	for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
c2b513df	427	struct bfs_inode *di;
f433dc56	428	int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
c2b513df	429	int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
75b25b4c	430	unsigned long eblock;
c2b513df AV	431
	432	if (!off) {
	433	brelse(bh);
	434	bh = sb_bread(s, block);
	435	}
	436
	437	if (!bh)
	438	continue;
	439
	440	di = (struct bfs_inode *)bh->b_data + off;
	441
e1f89ec9 ES	442	/* test if filesystem is not corrupted */
	443
	444	i_eoff = le32_to_cpu(di->i_eoffset);
	445	i_sblock = le32_to_cpu(di->i_sblock);
	446	i_eblock = le32_to_cpu(di->i_eblock);
	447	s_size = le32_to_cpu(bfs_sb->s_end);
	448
	449	if (i_sblock > info->si_blocks \|\|
	450	i_eblock > info->si_blocks \|\|
	451	i_sblock > i_eblock \|\|
	452	i_eoff > s_size \|\|
	453	i_sblock * BFS_BSIZE > i_eoff) {
	454
	455	printf("Inode 0x%08x corrupted\n", i);
	456
	457	brelse(bh);
5998649f AV	458	ret = -EIO;
5998649f AV	459	goto out3;
e1f89ec9 ES	460	}
e1f89ec9 ES	461
c2b513df	462	if (!di->i_ino) {
1da177e4	463	info->si_freei++;
c2b513df AV	464	continue;
	465	}
	466	set_bit(i, info->si_imap);
	467	info->si_freeb -= BFS_FILEBLOCKS(di);
	468
c2b513df	469	eblock = le32_to_cpu(di->i_eblock);
f433dc56	470	if (eblock > info->si_lf_eblk)
c2b513df	471	info->si_lf_eblk = eblock;
1da177e4	472	}
c2b513df	473	brelse(bh);
1da177e4	474	if (!(s->s_flags & MS_RDONLY)) {
c2b513df	475	mark_buffer_dirty(info->si_sbh);
1da177e4 LT	476	s->s_dirt = 1;
	477	}
	478	dump_imap("read_super", s);
	479	return 0;
	480
5998649f AV	481	out3:
	482	dput(s->s_root);
	483	s->s_root = NULL;
	484	out2:
	485	kfree(info->si_imap);
	486	out1:
	487	brelse(info->si_sbh);
1da177e4	488	out:
5998649f	489	mutex_destroy(&info->bfs_lock);
1da177e4 LT	490	kfree(info);
1da177e4 LT	491	s->s_fs_info = NULL;
e33ab086	492	return ret;
1da177e4 LT	493	}
1da177e4 LT	494
454e2398 DH	495	static int bfs_get_sb(struct file_system_type *fs_type,
454e2398 DH	496	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	497	{
454e2398	498	return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt);
1da177e4 LT	499	}
	500
	501	static struct file_system_type bfs_fs_type = {
	502	.owner = THIS_MODULE,
	503	.name = "bfs",
	504	.get_sb = bfs_get_sb,
	505	.kill_sb = kill_block_super,
	506	.fs_flags = FS_REQUIRES_DEV,
	507	};
	508
	509	static int __init init_bfs_fs(void)
	510	{
	511	int err = init_inodecache();
	512	if (err)
	513	goto out1;
	514	err = register_filesystem(&bfs_fs_type);
	515	if (err)
	516	goto out;
	517	return 0;
	518	out:
	519	destroy_inodecache();
	520	out1:
	521	return err;
	522	}
	523
	524	static void __exit exit_bfs_fs(void)
	525	{
	526	unregister_filesystem(&bfs_fs_type);
	527	destroy_inodecache();
	528	}
	529
	530	module_init(init_bfs_fs)
	531	module_exit(exit_bfs_fs)