[deliverable/linux.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

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

static void bfs_read_inode(struct inode *inode)
{
	unsigned long ino = inode->i_ino;
	struct bfs_inode *di;
	struct buffer_head *bh;
	int block, off;

	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);
		make_bad_inode(inode);
		return;
	}

	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);
		make_bad_inode(inode);
		return;
	}

	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);
}

static int bfs_write_inode(struct inode *inode, int unused)
{
	unsigned int ino = (u16)inode->i_ino;
        unsigned long i_sblock;
	struct bfs_inode *di;
	struct buffer_head *bh;
	int block, off;

        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;
	}

	lock_kernel();
	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);
		unlock_kernel();
		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);
	brelse(bh);
	unlock_kernel();
	return 0;
}

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;
	lock_kernel();
	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);
		unlock_kernel();
		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) {
		info->si_freeb += BFS_FILEBLOCKS(bi);
		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);
	}
	unlock_kernel();
	clear_inode(inode);
}

static void bfs_put_super(struct super_block *s)
{
	struct bfs_sb_info *info = BFS_SB(s);
	brelse(info->si_sbh);
	kfree(info->si_imap);
	kfree(info);
	s->s_fs_info = NULL;
}

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 void bfs_write_super(struct super_block *s)
{
	lock_kernel();
	if (!(s->s_flags & MS_RDONLY))
		mark_buffer_dirty(BFS_SB(s)->si_sbh);
	s->s_dirt = 0;
	unlock_kernel();
}

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(struct kmem_cache *cachep, 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,
	.read_inode	= bfs_read_inode,
	.write_inode	= bfs_write_inode,
	.delete_inode	= bfs_delete_inode,
	.put_super	= bfs_put_super,
	.write_super	= bfs_write_super,
	.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;

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

	sb_set_blocksize(s, BFS_BSIZE);

	bh = sb_bread(s, 0);
	if(!bh)
		goto out;
	bfs_sb = (struct bfs_super_block *)bh->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 out;
	}
	if (BFS_UNCLEAN(bfs_sb, s) && !silent)
		printf("%s is unclean, continuing\n", s->s_id);

	s->s_magic = BFS_MAGIC;
	info->si_sbh = bh;
	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 out;
	for (i = 0; i < BFS_ROOT_INO; i++)
		set_bit(i, info->si_imap);

	s->s_op = &bfs_sops;
	inode = iget(s, BFS_ROOT_INO);
	if (!inode) {
		kfree(info->si_imap);
		goto out;
	}
	s->s_root = d_alloc_root(inode);
	if (!s->s_root) {
		iput(inode);
		kfree(info->si_imap);
		goto out;
	}

	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;
	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 sblock, eblock;

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

		if (!bh)
			continue;

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

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

		sblock =  le32_to_cpu(di->i_sblock);
		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;

out:
	brelse(bh);
	kfree(info);
	s->s_fs_info = NULL;
	return -EINVAL;
}

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
f433dc56	33	void dump_imap(const char prefix, struct super_block s);
1da177e4	34
f433dc56	35	static void bfs_read_inode(struct inode *inode)
1da177e4 LT	36	{
1da177e4 LT	37	unsigned long ino = inode->i_ino;
f433dc56 DV	38	struct bfs_inode *di;
f433dc56 DV	39	struct buffer_head *bh;
1da177e4 LT	40	int block, off;
1da177e4 LT	41
f433dc56	42	if ((ino < BFS_ROOT_INO) \|\| (ino > BFS_SB(inode->i_sb)->si_lasti)) {
1da177e4 LT	43	printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino);
	44	make_bad_inode(inode);
	45	return;
	46	}
	47
f433dc56	48	block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
1da177e4 LT	49	bh = sb_bread(inode->i_sb, block);
1da177e4 LT	50	if (!bh) {
f433dc56 DV	51	printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id,
f433dc56 DV	52	ino);
1da177e4 LT	53	make_bad_inode(inode);
	54	return;
	55	}
	56
	57	off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
	58	di = (struct bfs_inode *)bh->b_data + off;
	59
f433dc56	60	inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode);
fac92bec	61	if (le32_to_cpu(di->i_vtype) == BFS_VDIR) {
1da177e4 LT	62	inode->i_mode \|= S_IFDIR;
	63	inode->i_op = &bfs_dir_inops;
	64	inode->i_fop = &bfs_dir_operations;
fac92bec	65	} else if (le32_to_cpu(di->i_vtype) == BFS_VREG) {
1da177e4 LT	66	inode->i_mode \|= S_IFREG;
	67	inode->i_op = &bfs_file_inops;
	68	inode->i_fop = &bfs_file_operations;
	69	inode->i_mapping->a_ops = &bfs_aops;
	70	}
	71
fac92bec AS	72	BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock);
fac92bec AS	73	BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock);
f433dc56	74	BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino);
fac92bec AS	75	inode->i_uid = le32_to_cpu(di->i_uid);
	76	inode->i_gid = le32_to_cpu(di->i_gid);
	77	inode->i_nlink = le32_to_cpu(di->i_nlink);
1da177e4 LT	78	inode->i_size = BFS_FILESIZE(di);
1da177e4 LT	79	inode->i_blocks = BFS_FILEBLOCKS(di);
fac92bec AS	80	inode->i_atime.tv_sec = le32_to_cpu(di->i_atime);
	81	inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime);
	82	inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime);
1da177e4 LT	83	inode->i_atime.tv_nsec = 0;
	84	inode->i_mtime.tv_nsec = 0;
	85	inode->i_ctime.tv_nsec = 0;
1da177e4 LT	86
	87	brelse(bh);
	88	}
	89
f433dc56	90	static int bfs_write_inode(struct inode *inode, int unused)
1da177e4	91	{
fac92bec AS	92	unsigned int ino = (u16)inode->i_ino;
fac92bec AS	93	unsigned long i_sblock;
f433dc56 DV	94	struct bfs_inode *di;
f433dc56 DV	95	struct buffer_head *bh;
1da177e4 LT	96	int block, off;
1da177e4 LT	97
fac92bec AS	98	dprintf("ino=%08x\n", ino);
fac92bec AS	99
f433dc56	100	if ((ino < BFS_ROOT_INO) \|\| (ino > BFS_SB(inode->i_sb)->si_lasti)) {
fac92bec	101	printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino);
1da177e4 LT	102	return -EIO;
	103	}
	104
	105	lock_kernel();
f433dc56	106	block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
1da177e4 LT	107	bh = sb_bread(inode->i_sb, block);
1da177e4 LT	108	if (!bh) {
f433dc56 DV	109	printf("Unable to read inode %s:%08x\n",
f433dc56 DV	110	inode->i_sb->s_id, ino);
1da177e4 LT	111	unlock_kernel();
	112	return -EIO;
	113	}
	114
f433dc56	115	off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
1da177e4 LT	116	di = (struct bfs_inode *)bh->b_data + off;
1da177e4 LT	117
fac92bec AS	118	if (ino == BFS_ROOT_INO)
fac92bec AS	119	di->i_vtype = cpu_to_le32(BFS_VDIR);
1da177e4	120	else
fac92bec AS	121	di->i_vtype = cpu_to_le32(BFS_VREG);
	122
	123	di->i_ino = cpu_to_le16(ino);
	124	di->i_mode = cpu_to_le32(inode->i_mode);
	125	di->i_uid = cpu_to_le32(inode->i_uid);
	126	di->i_gid = cpu_to_le32(inode->i_gid);
	127	di->i_nlink = cpu_to_le32(inode->i_nlink);
	128	di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
	129	di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
	130	di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
	131	i_sblock = BFS_I(inode)->i_sblock;
	132	di->i_sblock = cpu_to_le32(i_sblock);
	133	di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
	134	di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);
1da177e4 LT	135
	136	mark_buffer_dirty(bh);
	137	brelse(bh);
	138	unlock_kernel();
	139	return 0;
	140	}
	141
f433dc56	142	static void bfs_delete_inode(struct inode *inode)
1da177e4 LT	143	{
1da177e4 LT	144	unsigned long ino = inode->i_ino;
f433dc56 DV	145	struct bfs_inode *di;
f433dc56 DV	146	struct buffer_head *bh;
1da177e4	147	int block, off;
f433dc56 DV	148	struct super_block *s = inode->i_sb;
	149	struct bfs_sb_info *info = BFS_SB(s);
	150	struct bfs_inode_info *bi = BFS_I(inode);
1da177e4	151
fac92bec	152	dprintf("ino=%08lx\n", ino);
1da177e4	153
fef26658 MF	154	truncate_inode_pages(&inode->i_data, 0);
fef26658 MF	155
f433dc56	156	if ((ino < BFS_ROOT_INO) \|\| (ino > info->si_lasti)) {
fac92bec	157	printf("invalid ino=%08lx\n", ino);
1da177e4 LT	158	return;
	159	}
	160
	161	inode->i_size = 0;
	162	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
	163	lock_kernel();
	164	mark_inode_dirty(inode);
f433dc56 DV	165
f433dc56 DV	166	block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
1da177e4 LT	167	bh = sb_bread(s, block);
1da177e4 LT	168	if (!bh) {
f433dc56 DV	169	printf("Unable to read inode %s:%08lx\n",
f433dc56 DV	170	inode->i_sb->s_id, ino);
1da177e4 LT	171	unlock_kernel();
	172	return;
	173	}
f433dc56 DV	174	off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
	175	di = (struct bfs_inode *)bh->b_data + off;
	176	memset((void *)di, 0, sizeof(struct bfs_inode));
	177	mark_buffer_dirty(bh);
	178	brelse(bh);
	179
fac92bec	180	if (bi->i_dsk_ino) {
f433dc56	181	info->si_freeb += BFS_FILEBLOCKS(bi);
1da177e4	182	info->si_freei++;
fac92bec	183	clear_bit(ino, info->si_imap);
1da177e4	184	dump_imap("delete_inode", s);
fac92bec	185	}
1da177e4	186
f433dc56 DV	187	/*
	188	* If this was the last file, make the previous block
	189	* "last block of the last file" even if there is no
	190	* real file there, saves us 1 gap.
	191	*/
	192	if (info->si_lf_eblk == bi->i_eblock) {
	193	info->si_lf_eblk = bi->i_sblock - 1;
1da177e4 LT	194	mark_buffer_dirty(info->si_sbh);
	195	}
	196	unlock_kernel();
	197	clear_inode(inode);
	198	}
	199
	200	static void bfs_put_super(struct super_block *s)
	201	{
	202	struct bfs_sb_info *info = BFS_SB(s);
	203	brelse(info->si_sbh);
	204	kfree(info->si_imap);
	205	kfree(info);
	206	s->s_fs_info = NULL;
	207	}
	208
726c3342	209	static int bfs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	210	{
726c3342	211	struct super_block *s = dentry->d_sb;
1da177e4 LT	212	struct bfs_sb_info *info = BFS_SB(s);
	213	u64 id = huge_encode_dev(s->s_bdev->bd_dev);
	214	buf->f_type = BFS_MAGIC;
	215	buf->f_bsize = s->s_blocksize;
	216	buf->f_blocks = info->si_blocks;
	217	buf->f_bfree = buf->f_bavail = info->si_freeb;
	218	buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
	219	buf->f_ffree = info->si_freei;
	220	buf->f_fsid.val[0] = (u32)id;
	221	buf->f_fsid.val[1] = (u32)(id >> 32);
	222	buf->f_namelen = BFS_NAMELEN;
	223	return 0;
	224	}
	225
	226	static void bfs_write_super(struct super_block *s)
	227	{
	228	lock_kernel();
	229	if (!(s->s_flags & MS_RDONLY))
	230	mark_buffer_dirty(BFS_SB(s)->si_sbh);
	231	s->s_dirt = 0;
	232	unlock_kernel();
	233	}
	234
f433dc56	235	static struct kmem_cache *bfs_inode_cachep;
1da177e4 LT	236
	237	static struct inode bfs_alloc_inode(struct super_block sb)
	238	{
	239	struct bfs_inode_info *bi;
e94b1766	240	bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL);
1da177e4 LT	241	if (!bi)
	242	return NULL;
	243	return &bi->vfs_inode;
	244	}
	245
	246	static void bfs_destroy_inode(struct inode *inode)
	247	{
	248	kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
	249	}
	250
4ba9b9d0	251	static void init_once(struct kmem_cache cachep, void foo)
1da177e4 LT	252	{
	253	struct bfs_inode_info *bi = foo;
	254
a35afb83	255	inode_init_once(&bi->vfs_inode);
1da177e4	256	}
20c2df83	257
1da177e4 LT	258	static int init_inodecache(void)
	259	{
	260	bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
	261	sizeof(struct bfs_inode_info),
fffb60f9 PJ	262	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	263	SLAB_MEM_SPREAD),
20c2df83	264	init_once);
1da177e4 LT	265	if (bfs_inode_cachep == NULL)
	266	return -ENOMEM;
	267	return 0;
	268	}
	269
	270	static void destroy_inodecache(void)
	271	{
1a1d92c1	272	kmem_cache_destroy(bfs_inode_cachep);
1da177e4 LT	273	}
1da177e4 LT	274
ee9b6d61	275	static const struct super_operations bfs_sops = {
1da177e4 LT	276	.alloc_inode = bfs_alloc_inode,
	277	.destroy_inode = bfs_destroy_inode,
	278	.read_inode = bfs_read_inode,
	279	.write_inode = bfs_write_inode,
	280	.delete_inode = bfs_delete_inode,
	281	.put_super = bfs_put_super,
	282	.write_super = bfs_write_super,
	283	.statfs = bfs_statfs,
	284	};
	285
f433dc56	286	void dump_imap(const char prefix, struct super_block s)
1da177e4	287	{
fac92bec	288	#ifdef DEBUG
1da177e4 LT	289	int i;
	290	char tmpbuf = (char )get_zeroed_page(GFP_KERNEL);
	291
	292	if (!tmpbuf)
	293	return;
f433dc56 DV	294	for (i = BFS_SB(s)->si_lasti; i >= 0; i--) {
f433dc56 DV	295	if (i > PAGE_SIZE - 100) break;
1da177e4 LT	296	if (test_bit(i, BFS_SB(s)->si_imap))
	297	strcat(tmpbuf, "1");
	298	else
	299	strcat(tmpbuf, "0");
	300	}
f433dc56 DV	301	printf("BFS-fs: %s: lasti=%08lx <%s>\n",
f433dc56 DV	302	prefix, BFS_SB(s)->si_lasti, tmpbuf);
1da177e4 LT	303	free_page((unsigned long)tmpbuf);
	304	#endif
	305	}
	306
	307	static int bfs_fill_super(struct super_block s, void data, int silent)
	308	{
f433dc56 DV	309	struct buffer_head *bh;
	310	struct bfs_super_block *bfs_sb;
	311	struct inode *inode;
fac92bec	312	unsigned i, imap_len;
f433dc56	313	struct bfs_sb_info *info;
1da177e4	314
f8314dc6	315	info = kzalloc(sizeof(*info), GFP_KERNEL);
1da177e4 LT	316	if (!info)
	317	return -ENOMEM;
	318	s->s_fs_info = info;
1da177e4 LT	319
	320	sb_set_blocksize(s, BFS_BSIZE);
	321
	322	bh = sb_bread(s, 0);
	323	if(!bh)
	324	goto out;
	325	bfs_sb = (struct bfs_super_block *)bh->b_data;
fac92bec	326	if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
1da177e4 LT	327	if (!silent)
1da177e4 LT	328	printf("No BFS filesystem on %s (magic=%08x)\n",
fac92bec	329	s->s_id, le32_to_cpu(bfs_sb->s_magic));
1da177e4 LT	330	goto out;
	331	}
	332	if (BFS_UNCLEAN(bfs_sb, s) && !silent)
	333	printf("%s is unclean, continuing\n", s->s_id);
	334
	335	s->s_magic = BFS_MAGIC;
1da177e4	336	info->si_sbh = bh;
f433dc56 DV	337	info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
	338	sizeof(struct bfs_inode)
	339	+ BFS_ROOT_INO - 1;
	340	imap_len = (info->si_lasti / 8) + 1;
f8314dc6	341	info->si_imap = kzalloc(imap_len, GFP_KERNEL);
1da177e4 LT	342	if (!info->si_imap)
1da177e4 LT	343	goto out;
f433dc56	344	for (i = 0; i < BFS_ROOT_INO; i++)
1da177e4 LT	345	set_bit(i, info->si_imap);
	346
	347	s->s_op = &bfs_sops;
	348	inode = iget(s, BFS_ROOT_INO);
	349	if (!inode) {
	350	kfree(info->si_imap);
	351	goto out;
	352	}
	353	s->s_root = d_alloc_root(inode);
	354	if (!s->s_root) {
	355	iput(inode);
	356	kfree(info->si_imap);
	357	goto out;
	358	}
	359
f433dc56 DV	360	info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
	361	info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1
	362	- le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
1da177e4 LT	363	info->si_freei = 0;
1da177e4 LT	364	info->si_lf_eblk = 0;
c2b513df	365	bh = NULL;
f433dc56	366	for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
c2b513df	367	struct bfs_inode *di;
f433dc56	368	int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
c2b513df AV	369	int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
	370	unsigned long sblock, eblock;
	371
	372	if (!off) {
	373	brelse(bh);
	374	bh = sb_bread(s, block);
	375	}
	376
	377	if (!bh)
	378	continue;
	379
	380	di = (struct bfs_inode *)bh->b_data + off;
	381
	382	if (!di->i_ino) {
1da177e4	383	info->si_freei++;
c2b513df AV	384	continue;
	385	}
	386	set_bit(i, info->si_imap);
	387	info->si_freeb -= BFS_FILEBLOCKS(di);
	388
	389	sblock = le32_to_cpu(di->i_sblock);
	390	eblock = le32_to_cpu(di->i_eblock);
f433dc56	391	if (eblock > info->si_lf_eblk)
c2b513df	392	info->si_lf_eblk = eblock;
1da177e4	393	}
c2b513df	394	brelse(bh);
1da177e4	395	if (!(s->s_flags & MS_RDONLY)) {
c2b513df	396	mark_buffer_dirty(info->si_sbh);
1da177e4 LT	397	s->s_dirt = 1;
	398	}
	399	dump_imap("read_super", s);
	400	return 0;
	401
	402	out:
	403	brelse(bh);
	404	kfree(info);
	405	s->s_fs_info = NULL;
	406	return -EINVAL;
	407	}
	408
454e2398 DH	409	static int bfs_get_sb(struct file_system_type *fs_type,
454e2398 DH	410	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	411	{
454e2398	412	return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt);
1da177e4 LT	413	}
	414
	415	static struct file_system_type bfs_fs_type = {
	416	.owner = THIS_MODULE,
	417	.name = "bfs",
	418	.get_sb = bfs_get_sb,
	419	.kill_sb = kill_block_super,
	420	.fs_flags = FS_REQUIRES_DEV,
	421	};
	422
	423	static int __init init_bfs_fs(void)
	424	{
	425	int err = init_inodecache();
	426	if (err)
	427	goto out1;
	428	err = register_filesystem(&bfs_fs_type);
	429	if (err)
	430	goto out;
	431	return 0;
	432	out:
	433	destroy_inodecache();
	434	out1:
	435	return err;
	436	}
	437
	438	static void __exit exit_bfs_fs(void)
	439	{
	440	unregister_filesystem(&bfs_fs_type);
	441	destroy_inodecache();
	442	}
	443
	444	module_init(init_bfs_fs)
	445	module_exit(exit_bfs_fs)