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

/*
 *	fs/bfs/inode.c
 *	BFS superblock and inode operations.
 *	Copyright (C) 1999,2000 Tigran Aivazian <tigran@veritas.com>
 *	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 A. Aivazian <tigran@veritas.com>");
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);
	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);
        if (inode->i_size || inode->i_blocks) dprintf("Registered inode with %lld size, %ld blocks\n", inode->i_size, inode->i_blocks);
	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;
	BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino); /* can be 0 so we store a copy */

	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);
        dprintf("Written ino=%d into %d:%d\n",le16_to_cpu(di->i_ino),block,off);
	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;
        if (bi->i_dsk_ino) {
		info->si_freeb += 1 + bi->i_eblock - bi->i_sblock;
		info->si_freei++;
		clear_bit(ino, info->si_imap);
		dump_imap("delete_inode", s);
        }
	di->i_ino = 0;
	di->i_sblock = 0;
	mark_buffer_dirty(bh);
	brelse(bh);

	/* if this was the last file, make the previous 
	   block "last files last block" even if there is no real file there,
	   saves us 1 gap */
	if (info->si_lf_eblk == BFS_I(inode)->i_eblock) {
		info->si_lf_eblk = BFS_I(inode)->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(void * foo, struct kmem_cache * cachep, unsigned long flags)
{
	struct bfs_inode_info *bi = foo;

	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
	    SLAB_CTOR_CONSTRUCTOR)
		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, NULL);
	if (bfs_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

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

static 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");
	}
	printk(KERN_ERR "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; /* for statfs(2) */
	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;
	info->si_lf_sblk = 0;
	info->si_lf_ioff = 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;
			info->si_lf_sblk = sblock;
			info->si_lf_ioff = BFS_INO2OFF(i);
		}
	}
	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.
	4	* Copyright (C) 1999,2000 Tigran Aivazian <tigran@veritas.com>
	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
	21	MODULE_AUTHOR("Tigran A. Aivazian <tigran@veritas.com>");
	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
	33	void dump_imap(const char prefix, struct super_block s);
	34
	35	static void bfs_read_inode(struct inode * inode)
	36	{
	37	unsigned long ino = inode->i_ino;
	38	struct bfs_inode * di;
	39	struct buffer_head * bh;
	40	int block, off;
	41
	42	if (ino < BFS_ROOT_INO \|\| ino > BFS_SB(inode->i_sb)->si_lasti) {
	43	printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino);
	44	make_bad_inode(inode);
	45	return;
	46	}
	47
	48	block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
	49	bh = sb_bread(inode->i_sb, block);
	50	if (!bh) {
	51	printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, ino);
	52	make_bad_inode(inode);
	53	return;
	54	}
	55
	56	off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
	57	di = (struct bfs_inode *)bh->b_data + off;
	58
fac92bec AS	59	inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode);
fac92bec AS	60	if (le32_to_cpu(di->i_vtype) == BFS_VDIR) {
1da177e4 LT	61	inode->i_mode \|= S_IFDIR;
	62	inode->i_op = &bfs_dir_inops;
	63	inode->i_fop = &bfs_dir_operations;
fac92bec	64	} else if (le32_to_cpu(di->i_vtype) == BFS_VREG) {
1da177e4 LT	65	inode->i_mode \|= S_IFREG;
	66	inode->i_op = &bfs_file_inops;
	67	inode->i_fop = &bfs_file_operations;
	68	inode->i_mapping->a_ops = &bfs_aops;
	69	}
	70
fac92bec AS	71	BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock);
	72	BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock);
	73	inode->i_uid = le32_to_cpu(di->i_uid);
	74	inode->i_gid = le32_to_cpu(di->i_gid);
	75	inode->i_nlink = le32_to_cpu(di->i_nlink);
1da177e4 LT	76	inode->i_size = BFS_FILESIZE(di);
1da177e4 LT	77	inode->i_blocks = BFS_FILEBLOCKS(di);
fac92bec	78	if (inode->i_size \|\| inode->i_blocks) dprintf("Registered inode with %lld size, %ld blocks\n", inode->i_size, inode->i_blocks);
fac92bec AS	79	inode->i_atime.tv_sec = le32_to_cpu(di->i_atime);
	80	inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime);
	81	inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime);
1da177e4 LT	82	inode->i_atime.tv_nsec = 0;
	83	inode->i_mtime.tv_nsec = 0;
	84	inode->i_ctime.tv_nsec = 0;
fac92bec	85	BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino); /* can be 0 so we store a copy */
1da177e4 LT	86
	87	brelse(bh);
	88	}
	89
	90	static int bfs_write_inode(struct inode * inode, int unused)
	91	{
fac92bec AS	92	unsigned int ino = (u16)inode->i_ino;
fac92bec AS	93	unsigned long i_sblock;
1da177e4 LT	94	struct bfs_inode * di;
	95	struct buffer_head * bh;
	96	int block, off;
	97
fac92bec AS	98	dprintf("ino=%08x\n", ino);
fac92bec AS	99
1da177e4	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();
	106	block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
	107	bh = sb_bread(inode->i_sb, block);
	108	if (!bh) {
fac92bec	109	printf("Unable to read inode %s:%08x\n", inode->i_sb->s_id, ino);
1da177e4 LT	110	unlock_kernel();
	111	return -EIO;
	112	}
	113
	114	off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK;
	115	di = (struct bfs_inode *)bh->b_data + off;
	116
fac92bec AS	117	if (ino == BFS_ROOT_INO)
fac92bec AS	118	di->i_vtype = cpu_to_le32(BFS_VDIR);
1da177e4	119	else
fac92bec AS	120	di->i_vtype = cpu_to_le32(BFS_VREG);
	121
	122	di->i_ino = cpu_to_le16(ino);
	123	di->i_mode = cpu_to_le32(inode->i_mode);
	124	di->i_uid = cpu_to_le32(inode->i_uid);
	125	di->i_gid = cpu_to_le32(inode->i_gid);
	126	di->i_nlink = cpu_to_le32(inode->i_nlink);
	127	di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
	128	di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
	129	di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
	130	i_sblock = BFS_I(inode)->i_sblock;
	131	di->i_sblock = cpu_to_le32(i_sblock);
	132	di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
	133	di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);
1da177e4 LT	134
1da177e4 LT	135	mark_buffer_dirty(bh);
fac92bec	136	dprintf("Written ino=%d into %d:%d\n",le16_to_cpu(di->i_ino),block,off);
1da177e4 LT	137	brelse(bh);
	138	unlock_kernel();
	139	return 0;
	140	}
	141
	142	static void bfs_delete_inode(struct inode * inode)
	143	{
	144	unsigned long ino = inode->i_ino;
	145	struct bfs_inode * di;
	146	struct buffer_head * bh;
	147	int block, off;
	148	struct super_block * s = inode->i_sb;
	149	struct bfs_sb_info * info = BFS_SB(s);
fac92bec	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
fac92bec AS	156	if (ino < BFS_ROOT_INO \|\| ino > info->si_lasti) {
fac92bec AS	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);
	165	block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
	166	bh = sb_bread(s, block);
	167	if (!bh) {
	168	printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, ino);
	169	unlock_kernel();
	170	return;
	171	}
	172	off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK;
fac92bec AS	173	di = (struct bfs_inode *) bh->b_data + off;
	174	if (bi->i_dsk_ino) {
	175	info->si_freeb += 1 + bi->i_eblock - bi->i_sblock;
1da177e4	176	info->si_freei++;
fac92bec	177	clear_bit(ino, info->si_imap);
1da177e4	178	dump_imap("delete_inode", s);
fac92bec	179	}
1da177e4 LT	180	di->i_ino = 0;
	181	di->i_sblock = 0;
	182	mark_buffer_dirty(bh);
	183	brelse(bh);
	184
	185	/* if this was the last file, make the previous
	186	block "last files last block" even if there is no real file there,
	187	saves us 1 gap */
	188	if (info->si_lf_eblk == BFS_I(inode)->i_eblock) {
	189	info->si_lf_eblk = BFS_I(inode)->i_sblock - 1;
	190	mark_buffer_dirty(info->si_sbh);
	191	}
	192	unlock_kernel();
	193	clear_inode(inode);
	194	}
	195
	196	static void bfs_put_super(struct super_block *s)
	197	{
	198	struct bfs_sb_info *info = BFS_SB(s);
	199	brelse(info->si_sbh);
	200	kfree(info->si_imap);
	201	kfree(info);
	202	s->s_fs_info = NULL;
	203	}
	204
726c3342	205	static int bfs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	206	{
726c3342	207	struct super_block *s = dentry->d_sb;
1da177e4 LT	208	struct bfs_sb_info *info = BFS_SB(s);
	209	u64 id = huge_encode_dev(s->s_bdev->bd_dev);
	210	buf->f_type = BFS_MAGIC;
	211	buf->f_bsize = s->s_blocksize;
	212	buf->f_blocks = info->si_blocks;
	213	buf->f_bfree = buf->f_bavail = info->si_freeb;
	214	buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
	215	buf->f_ffree = info->si_freei;
	216	buf->f_fsid.val[0] = (u32)id;
	217	buf->f_fsid.val[1] = (u32)(id >> 32);
	218	buf->f_namelen = BFS_NAMELEN;
	219	return 0;
	220	}
	221
	222	static void bfs_write_super(struct super_block *s)
	223	{
	224	lock_kernel();
	225	if (!(s->s_flags & MS_RDONLY))
	226	mark_buffer_dirty(BFS_SB(s)->si_sbh);
	227	s->s_dirt = 0;
	228	unlock_kernel();
	229	}
	230
e18b890b	231	static struct kmem_cache * bfs_inode_cachep;
1da177e4 LT	232
	233	static struct inode bfs_alloc_inode(struct super_block sb)
	234	{
	235	struct bfs_inode_info *bi;
e94b1766	236	bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL);
1da177e4 LT	237	if (!bi)
	238	return NULL;
	239	return &bi->vfs_inode;
	240	}
	241
	242	static void bfs_destroy_inode(struct inode *inode)
	243	{
	244	kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
	245	}
	246
e18b890b	247	static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
1da177e4 LT	248	{
	249	struct bfs_inode_info *bi = foo;
	250
	251	if ((flags & (SLAB_CTOR_VERIFY\|SLAB_CTOR_CONSTRUCTOR)) ==
	252	SLAB_CTOR_CONSTRUCTOR)
	253	inode_init_once(&bi->vfs_inode);
	254	}
	255
	256	static int init_inodecache(void)
	257	{
	258	bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
	259	sizeof(struct bfs_inode_info),
fffb60f9 PJ	260	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	261	SLAB_MEM_SPREAD),
1da177e4 LT	262	init_once, NULL);
	263	if (bfs_inode_cachep == NULL)
	264	return -ENOMEM;
	265	return 0;
	266	}
	267
	268	static void destroy_inodecache(void)
	269	{
1a1d92c1	270	kmem_cache_destroy(bfs_inode_cachep);
1da177e4 LT	271	}
	272
	273	static struct super_operations bfs_sops = {
	274	.alloc_inode = bfs_alloc_inode,
	275	.destroy_inode = bfs_destroy_inode,
	276	.read_inode = bfs_read_inode,
	277	.write_inode = bfs_write_inode,
	278	.delete_inode = bfs_delete_inode,
	279	.put_super = bfs_put_super,
	280	.write_super = bfs_write_super,
	281	.statfs = bfs_statfs,
	282	};
	283
	284	void dump_imap(const char prefix, struct super_block s)
	285	{
fac92bec	286	#ifdef DEBUG
1da177e4 LT	287	int i;
	288	char tmpbuf = (char )get_zeroed_page(GFP_KERNEL);
	289
	290	if (!tmpbuf)
	291	return;
	292	for (i=BFS_SB(s)->si_lasti; i>=0; i--) {
fac92bec	293	if (i > PAGE_SIZE-100) break;
1da177e4 LT	294	if (test_bit(i, BFS_SB(s)->si_imap))
	295	strcat(tmpbuf, "1");
	296	else
	297	strcat(tmpbuf, "0");
	298	}
	299	printk(KERN_ERR "BFS-fs: %s: lasti=%08lx <%s>\n", prefix, BFS_SB(s)->si_lasti, tmpbuf);
	300	free_page((unsigned long)tmpbuf);
	301	#endif
	302	}
	303
	304	static int bfs_fill_super(struct super_block s, void data, int silent)
	305	{
	306	struct buffer_head * bh;
	307	struct bfs_super_block * bfs_sb;
	308	struct inode * inode;
fac92bec	309	unsigned i, imap_len;
1da177e4 LT	310	struct bfs_sb_info * info;
1da177e4 LT	311
f8314dc6	312	info = kzalloc(sizeof(*info), GFP_KERNEL);
1da177e4 LT	313	if (!info)
	314	return -ENOMEM;
	315	s->s_fs_info = info;
1da177e4 LT	316
	317	sb_set_blocksize(s, BFS_BSIZE);
	318
	319	bh = sb_bread(s, 0);
	320	if(!bh)
	321	goto out;
	322	bfs_sb = (struct bfs_super_block *)bh->b_data;
fac92bec	323	if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
1da177e4 LT	324	if (!silent)
1da177e4 LT	325	printf("No BFS filesystem on %s (magic=%08x)\n",
fac92bec	326	s->s_id, le32_to_cpu(bfs_sb->s_magic));
1da177e4 LT	327	goto out;
	328	}
	329	if (BFS_UNCLEAN(bfs_sb, s) && !silent)
	330	printf("%s is unclean, continuing\n", s->s_id);
	331
	332	s->s_magic = BFS_MAGIC;
1da177e4	333	info->si_sbh = bh;
fac92bec	334	info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE)/sizeof(struct bfs_inode)
1da177e4 LT	335	+ BFS_ROOT_INO - 1;
	336
	337	imap_len = info->si_lasti/8 + 1;
f8314dc6	338	info->si_imap = kzalloc(imap_len, GFP_KERNEL);
1da177e4 LT	339	if (!info->si_imap)
1da177e4 LT	340	goto out;
1da177e4 LT	341	for (i=0; i<BFS_ROOT_INO; i++)
	342	set_bit(i, info->si_imap);
	343
	344	s->s_op = &bfs_sops;
	345	inode = iget(s, BFS_ROOT_INO);
	346	if (!inode) {
	347	kfree(info->si_imap);
	348	goto out;
	349	}
	350	s->s_root = d_alloc_root(inode);
	351	if (!s->s_root) {
	352	iput(inode);
	353	kfree(info->si_imap);
	354	goto out;
	355	}
	356
fac92bec	357	info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1)>>BFS_BSIZE_BITS; /* for statfs(2) */
ce0fe7e7	358	info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 - le32_to_cpu(bfs_sb->s_start))>>BFS_BSIZE_BITS;
1da177e4 LT	359	info->si_freei = 0;
	360	info->si_lf_eblk = 0;
	361	info->si_lf_sblk = 0;
	362	info->si_lf_ioff = 0;
c2b513df	363	bh = NULL;
1da177e4	364	for (i=BFS_ROOT_INO; i<=info->si_lasti; i++) {
c2b513df AV	365	struct bfs_inode *di;
	366	int block = (i - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
	367	int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
	368	unsigned long sblock, eblock;
	369
	370	if (!off) {
	371	brelse(bh);
	372	bh = sb_bread(s, block);
	373	}
	374
	375	if (!bh)
	376	continue;
	377
	378	di = (struct bfs_inode *)bh->b_data + off;
	379
	380	if (!di->i_ino) {
1da177e4	381	info->si_freei++;
c2b513df AV	382	continue;
	383	}
	384	set_bit(i, info->si_imap);
	385	info->si_freeb -= BFS_FILEBLOCKS(di);
	386
	387	sblock = le32_to_cpu(di->i_sblock);
	388	eblock = le32_to_cpu(di->i_eblock);
	389	if (eblock > info->si_lf_eblk) {
	390	info->si_lf_eblk = eblock;
	391	info->si_lf_sblk = sblock;
	392	info->si_lf_ioff = BFS_INO2OFF(i);
1da177e4	393	}
1da177e4	394	}
c2b513df	395	brelse(bh);
1da177e4	396	if (!(s->s_flags & MS_RDONLY)) {
c2b513df	397	mark_buffer_dirty(info->si_sbh);
1da177e4 LT	398	s->s_dirt = 1;
	399	}
	400	dump_imap("read_super", s);
	401	return 0;
	402
	403	out:
	404	brelse(bh);
	405	kfree(info);
	406	s->s_fs_info = NULL;
	407	return -EINVAL;
	408	}
	409
454e2398 DH	410	static int bfs_get_sb(struct file_system_type *fs_type,
454e2398 DH	411	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	412	{
454e2398	413	return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt);
1da177e4 LT	414	}
	415
	416	static struct file_system_type bfs_fs_type = {
	417	.owner = THIS_MODULE,
	418	.name = "bfs",
	419	.get_sb = bfs_get_sb,
	420	.kill_sb = kill_block_super,
	421	.fs_flags = FS_REQUIRES_DEV,
	422	};
	423
	424	static int __init init_bfs_fs(void)
	425	{
	426	int err = init_inodecache();
	427	if (err)
	428	goto out1;
	429	err = register_filesystem(&bfs_fs_type);
	430	if (err)
	431	goto out;
	432	return 0;
	433	out:
	434	destroy_inodecache();
	435	out1:
	436	return err;
	437	}
	438
	439	static void __exit exit_bfs_fs(void)
	440	{
	441	unregister_filesystem(&bfs_fs_type);
	442	destroy_inodecache();
	443	}
	444
	445	module_init(init_bfs_fs)
	446	module_exit(exit_bfs_fs)