[mirror_ubuntu-bionic-kernel.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);

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 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) {
		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);
	}
	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,
	.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;
	long ret = -EINVAL;

	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 = bfs_iget(s, BFS_ROOT_INO);
	if (IS_ERR(inode)) {
		ret = PTR_ERR(inode);
		kfree(info->si_imap);
		goto out;
	}
	s->s_root = d_alloc_root(inode);
	if (!s->s_root) {
		iput(inode);
		ret = -ENOMEM;
		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 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);

		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 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
f433dc56	33	void dump_imap(const char prefix, struct super_block s);
1da177e4	34
e33ab086	35	struct inode bfs_iget(struct super_block sb, unsigned long ino)
1da177e4	36	{
f433dc56	37	struct bfs_inode *di;
e33ab086	38	struct inode *inode;
f433dc56	39	struct buffer_head *bh;
1da177e4 LT	40	int block, off;
1da177e4 LT	41
e33ab086 DH	42	inode = iget_locked(sb, ino);
	43	if (IS_ERR(inode))
	44	return ERR_PTR(-ENOMEM);
	45	if (!(inode->i_state & I_NEW))
	46	return inode;
	47
f433dc56	48	if ((ino < BFS_ROOT_INO) \|\| (ino > BFS_SB(inode->i_sb)->si_lasti)) {
1da177e4	49	printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino);
e33ab086	50	goto error;
1da177e4 LT	51	}
1da177e4 LT	52
f433dc56	53	block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
1da177e4 LT	54	bh = sb_bread(inode->i_sb, block);
1da177e4 LT	55	if (!bh) {
f433dc56 DV	56	printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id,
f433dc56 DV	57	ino);
e33ab086	58	goto error;
1da177e4 LT	59	}
	60
	61	off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
	62	di = (struct bfs_inode *)bh->b_data + off;
	63
f433dc56	64	inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode);
fac92bec	65	if (le32_to_cpu(di->i_vtype) == BFS_VDIR) {
1da177e4 LT	66	inode->i_mode \|= S_IFDIR;
	67	inode->i_op = &bfs_dir_inops;
	68	inode->i_fop = &bfs_dir_operations;
fac92bec	69	} else if (le32_to_cpu(di->i_vtype) == BFS_VREG) {
1da177e4 LT	70	inode->i_mode \|= S_IFREG;
	71	inode->i_op = &bfs_file_inops;
	72	inode->i_fop = &bfs_file_operations;
	73	inode->i_mapping->a_ops = &bfs_aops;
	74	}
	75
fac92bec AS	76	BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock);
fac92bec AS	77	BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock);
f433dc56	78	BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino);
fac92bec AS	79	inode->i_uid = le32_to_cpu(di->i_uid);
	80	inode->i_gid = le32_to_cpu(di->i_gid);
	81	inode->i_nlink = le32_to_cpu(di->i_nlink);
1da177e4 LT	82	inode->i_size = BFS_FILESIZE(di);
1da177e4 LT	83	inode->i_blocks = BFS_FILEBLOCKS(di);
fac92bec AS	84	inode->i_atime.tv_sec = le32_to_cpu(di->i_atime);
	85	inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime);
	86	inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime);
1da177e4 LT	87	inode->i_atime.tv_nsec = 0;
	88	inode->i_mtime.tv_nsec = 0;
	89	inode->i_ctime.tv_nsec = 0;
1da177e4 LT	90
1da177e4 LT	91	brelse(bh);
e33ab086 DH	92	unlock_new_inode(inode);
	93	return inode;
	94
	95	error:
	96	iget_failed(inode);
	97	return ERR_PTR(-EIO);
1da177e4 LT	98	}
1da177e4 LT	99
f433dc56	100	static int bfs_write_inode(struct inode *inode, int unused)
1da177e4	101	{
fac92bec AS	102	unsigned int ino = (u16)inode->i_ino;
fac92bec AS	103	unsigned long i_sblock;
f433dc56 DV	104	struct bfs_inode *di;
f433dc56 DV	105	struct buffer_head *bh;
1da177e4 LT	106	int block, off;
1da177e4 LT	107
fac92bec AS	108	dprintf("ino=%08x\n", ino);
fac92bec AS	109
f433dc56	110	if ((ino < BFS_ROOT_INO) \|\| (ino > BFS_SB(inode->i_sb)->si_lasti)) {
fac92bec	111	printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino);
1da177e4 LT	112	return -EIO;
	113	}
	114
	115	lock_kernel();
f433dc56	116	block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
1da177e4 LT	117	bh = sb_bread(inode->i_sb, block);
1da177e4 LT	118	if (!bh) {
f433dc56 DV	119	printf("Unable to read inode %s:%08x\n",
f433dc56 DV	120	inode->i_sb->s_id, ino);
1da177e4 LT	121	unlock_kernel();
	122	return -EIO;
	123	}
	124
f433dc56	125	off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
1da177e4 LT	126	di = (struct bfs_inode *)bh->b_data + off;
1da177e4 LT	127
fac92bec AS	128	if (ino == BFS_ROOT_INO)
fac92bec AS	129	di->i_vtype = cpu_to_le32(BFS_VDIR);
1da177e4	130	else
fac92bec AS	131	di->i_vtype = cpu_to_le32(BFS_VREG);
	132
	133	di->i_ino = cpu_to_le16(ino);
	134	di->i_mode = cpu_to_le32(inode->i_mode);
	135	di->i_uid = cpu_to_le32(inode->i_uid);
	136	di->i_gid = cpu_to_le32(inode->i_gid);
	137	di->i_nlink = cpu_to_le32(inode->i_nlink);
	138	di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
	139	di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
	140	di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
	141	i_sblock = BFS_I(inode)->i_sblock;
	142	di->i_sblock = cpu_to_le32(i_sblock);
	143	di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
	144	di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);
1da177e4 LT	145
	146	mark_buffer_dirty(bh);
	147	brelse(bh);
	148	unlock_kernel();
	149	return 0;
	150	}
	151
f433dc56	152	static void bfs_delete_inode(struct inode *inode)
1da177e4 LT	153	{
1da177e4 LT	154	unsigned long ino = inode->i_ino;
f433dc56 DV	155	struct bfs_inode *di;
f433dc56 DV	156	struct buffer_head *bh;
1da177e4	157	int block, off;
f433dc56 DV	158	struct super_block *s = inode->i_sb;
	159	struct bfs_sb_info *info = BFS_SB(s);
	160	struct bfs_inode_info *bi = BFS_I(inode);
1da177e4	161
fac92bec	162	dprintf("ino=%08lx\n", ino);
1da177e4	163
fef26658 MF	164	truncate_inode_pages(&inode->i_data, 0);
fef26658 MF	165
f433dc56	166	if ((ino < BFS_ROOT_INO) \|\| (ino > info->si_lasti)) {
fac92bec	167	printf("invalid ino=%08lx\n", ino);
1da177e4 LT	168	return;
	169	}
	170
	171	inode->i_size = 0;
	172	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
	173	lock_kernel();
	174	mark_inode_dirty(inode);
f433dc56 DV	175
f433dc56 DV	176	block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
1da177e4 LT	177	bh = sb_bread(s, block);
1da177e4 LT	178	if (!bh) {
f433dc56 DV	179	printf("Unable to read inode %s:%08lx\n",
f433dc56 DV	180	inode->i_sb->s_id, ino);
1da177e4 LT	181	unlock_kernel();
	182	return;
	183	}
f433dc56 DV	184	off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
	185	di = (struct bfs_inode *)bh->b_data + off;
	186	memset((void *)di, 0, sizeof(struct bfs_inode));
	187	mark_buffer_dirty(bh);
	188	brelse(bh);
	189
fac92bec	190	if (bi->i_dsk_ino) {
7e46aa5c AV	191	if (bi->i_sblock)
7e46aa5c AV	192	info->si_freeb += bi->i_eblock + 1 - bi->i_sblock;
1da177e4	193	info->si_freei++;
fac92bec	194	clear_bit(ino, info->si_imap);
1da177e4	195	dump_imap("delete_inode", s);
fac92bec	196	}
1da177e4	197
f433dc56 DV	198	/*
	199	* If this was the last file, make the previous block
	200	* "last block of the last file" even if there is no
	201	* real file there, saves us 1 gap.
	202	*/
	203	if (info->si_lf_eblk == bi->i_eblock) {
	204	info->si_lf_eblk = bi->i_sblock - 1;
1da177e4 LT	205	mark_buffer_dirty(info->si_sbh);
	206	}
	207	unlock_kernel();
	208	clear_inode(inode);
	209	}
	210
	211	static void bfs_put_super(struct super_block *s)
	212	{
	213	struct bfs_sb_info *info = BFS_SB(s);
	214	brelse(info->si_sbh);
	215	kfree(info->si_imap);
	216	kfree(info);
	217	s->s_fs_info = NULL;
	218	}
	219
726c3342	220	static int bfs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	221	{
726c3342	222	struct super_block *s = dentry->d_sb;
1da177e4 LT	223	struct bfs_sb_info *info = BFS_SB(s);
	224	u64 id = huge_encode_dev(s->s_bdev->bd_dev);
	225	buf->f_type = BFS_MAGIC;
	226	buf->f_bsize = s->s_blocksize;
	227	buf->f_blocks = info->si_blocks;
	228	buf->f_bfree = buf->f_bavail = info->si_freeb;
	229	buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
	230	buf->f_ffree = info->si_freei;
	231	buf->f_fsid.val[0] = (u32)id;
	232	buf->f_fsid.val[1] = (u32)(id >> 32);
	233	buf->f_namelen = BFS_NAMELEN;
	234	return 0;
	235	}
	236
	237	static void bfs_write_super(struct super_block *s)
	238	{
	239	lock_kernel();
	240	if (!(s->s_flags & MS_RDONLY))
	241	mark_buffer_dirty(BFS_SB(s)->si_sbh);
	242	s->s_dirt = 0;
	243	unlock_kernel();
	244	}
	245
f433dc56	246	static struct kmem_cache *bfs_inode_cachep;
1da177e4 LT	247
	248	static struct inode bfs_alloc_inode(struct super_block sb)
	249	{
	250	struct bfs_inode_info *bi;
e94b1766	251	bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL);
1da177e4 LT	252	if (!bi)
	253	return NULL;
	254	return &bi->vfs_inode;
	255	}
	256
	257	static void bfs_destroy_inode(struct inode *inode)
	258	{
	259	kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
	260	}
	261
4ba9b9d0	262	static void init_once(struct kmem_cache cachep, void foo)
1da177e4 LT	263	{
	264	struct bfs_inode_info *bi = foo;
	265
a35afb83	266	inode_init_once(&bi->vfs_inode);
1da177e4	267	}
20c2df83	268
1da177e4 LT	269	static int init_inodecache(void)
	270	{
	271	bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
	272	sizeof(struct bfs_inode_info),
fffb60f9 PJ	273	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	274	SLAB_MEM_SPREAD),
20c2df83	275	init_once);
1da177e4 LT	276	if (bfs_inode_cachep == NULL)
	277	return -ENOMEM;
	278	return 0;
	279	}
	280
	281	static void destroy_inodecache(void)
	282	{
1a1d92c1	283	kmem_cache_destroy(bfs_inode_cachep);
1da177e4 LT	284	}
1da177e4 LT	285
ee9b6d61	286	static const struct super_operations bfs_sops = {
1da177e4 LT	287	.alloc_inode = bfs_alloc_inode,
1da177e4 LT	288	.destroy_inode = bfs_destroy_inode,
1da177e4 LT	289	.write_inode = bfs_write_inode,
	290	.delete_inode = bfs_delete_inode,
	291	.put_super = bfs_put_super,
	292	.write_super = bfs_write_super,
	293	.statfs = bfs_statfs,
	294	};
	295
f433dc56	296	void dump_imap(const char prefix, struct super_block s)
1da177e4	297	{
fac92bec	298	#ifdef DEBUG
1da177e4 LT	299	int i;
	300	char tmpbuf = (char )get_zeroed_page(GFP_KERNEL);
	301
	302	if (!tmpbuf)
	303	return;
f433dc56 DV	304	for (i = BFS_SB(s)->si_lasti; i >= 0; i--) {
f433dc56 DV	305	if (i > PAGE_SIZE - 100) break;
1da177e4 LT	306	if (test_bit(i, BFS_SB(s)->si_imap))
	307	strcat(tmpbuf, "1");
	308	else
	309	strcat(tmpbuf, "0");
	310	}
f433dc56 DV	311	printf("BFS-fs: %s: lasti=%08lx <%s>\n",
f433dc56 DV	312	prefix, BFS_SB(s)->si_lasti, tmpbuf);
1da177e4 LT	313	free_page((unsigned long)tmpbuf);
	314	#endif
	315	}
	316
	317	static int bfs_fill_super(struct super_block s, void data, int silent)
	318	{
f433dc56 DV	319	struct buffer_head *bh;
	320	struct bfs_super_block *bfs_sb;
	321	struct inode *inode;
fac92bec	322	unsigned i, imap_len;
f433dc56	323	struct bfs_sb_info *info;
e33ab086	324	long ret = -EINVAL;
1da177e4	325
f8314dc6	326	info = kzalloc(sizeof(*info), GFP_KERNEL);
1da177e4 LT	327	if (!info)
	328	return -ENOMEM;
	329	s->s_fs_info = info;
1da177e4 LT	330
	331	sb_set_blocksize(s, BFS_BSIZE);
	332
	333	bh = sb_bread(s, 0);
	334	if(!bh)
	335	goto out;
	336	bfs_sb = (struct bfs_super_block *)bh->b_data;
fac92bec	337	if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
1da177e4 LT	338	if (!silent)
1da177e4 LT	339	printf("No BFS filesystem on %s (magic=%08x)\n",
fac92bec	340	s->s_id, le32_to_cpu(bfs_sb->s_magic));
1da177e4 LT	341	goto out;
	342	}
	343	if (BFS_UNCLEAN(bfs_sb, s) && !silent)
	344	printf("%s is unclean, continuing\n", s->s_id);
	345
	346	s->s_magic = BFS_MAGIC;
1da177e4	347	info->si_sbh = bh;
f433dc56 DV	348	info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
	349	sizeof(struct bfs_inode)
	350	+ BFS_ROOT_INO - 1;
	351	imap_len = (info->si_lasti / 8) + 1;
f8314dc6	352	info->si_imap = kzalloc(imap_len, GFP_KERNEL);
1da177e4 LT	353	if (!info->si_imap)
1da177e4 LT	354	goto out;
f433dc56	355	for (i = 0; i < BFS_ROOT_INO; i++)
1da177e4 LT	356	set_bit(i, info->si_imap);
	357
	358	s->s_op = &bfs_sops;
e33ab086 DH	359	inode = bfs_iget(s, BFS_ROOT_INO);
	360	if (IS_ERR(inode)) {
	361	ret = PTR_ERR(inode);
1da177e4 LT	362	kfree(info->si_imap);
	363	goto out;
	364	}
	365	s->s_root = d_alloc_root(inode);
	366	if (!s->s_root) {
	367	iput(inode);
e33ab086	368	ret = -ENOMEM;
1da177e4 LT	369	kfree(info->si_imap);
	370	goto out;
	371	}
	372
f433dc56 DV	373	info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
	374	info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1
	375	- le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
1da177e4 LT	376	info->si_freei = 0;
1da177e4 LT	377	info->si_lf_eblk = 0;
c2b513df	378	bh = NULL;
f433dc56	379	for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
c2b513df	380	struct bfs_inode *di;
f433dc56	381	int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
c2b513df	382	int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
75b25b4c	383	unsigned long eblock;
c2b513df AV	384
	385	if (!off) {
	386	brelse(bh);
	387	bh = sb_bread(s, block);
	388	}
	389
	390	if (!bh)
	391	continue;
	392
	393	di = (struct bfs_inode *)bh->b_data + off;
	394
	395	if (!di->i_ino) {
1da177e4	396	info->si_freei++;
c2b513df AV	397	continue;
	398	}
	399	set_bit(i, info->si_imap);
	400	info->si_freeb -= BFS_FILEBLOCKS(di);
	401
c2b513df	402	eblock = le32_to_cpu(di->i_eblock);
f433dc56	403	if (eblock > info->si_lf_eblk)
c2b513df	404	info->si_lf_eblk = eblock;
1da177e4	405	}
c2b513df	406	brelse(bh);
1da177e4	407	if (!(s->s_flags & MS_RDONLY)) {
c2b513df	408	mark_buffer_dirty(info->si_sbh);
1da177e4 LT	409	s->s_dirt = 1;
	410	}
	411	dump_imap("read_super", s);
	412	return 0;
	413
	414	out:
	415	brelse(bh);
	416	kfree(info);
	417	s->s_fs_info = NULL;
e33ab086	418	return ret;
1da177e4 LT	419	}
1da177e4 LT	420
454e2398 DH	421	static int bfs_get_sb(struct file_system_type *fs_type,
454e2398 DH	422	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	423	{
454e2398	424	return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt);
1da177e4 LT	425	}
	426
	427	static struct file_system_type bfs_fs_type = {
	428	.owner = THIS_MODULE,
	429	.name = "bfs",
	430	.get_sb = bfs_get_sb,
	431	.kill_sb = kill_block_super,
	432	.fs_flags = FS_REQUIRES_DEV,
	433	};
	434
	435	static int __init init_bfs_fs(void)
	436	{
	437	int err = init_inodecache();
	438	if (err)
	439	goto out1;
	440	err = register_filesystem(&bfs_fs_type);
	441	if (err)
	442	goto out;
	443	return 0;
	444	out:
	445	destroy_inodecache();
	446	out1:
	447	return err;
	448	}
	449
	450	static void __exit exit_bfs_fs(void)
	451	{
	452	unregister_filesystem(&bfs_fs_type);
	453	destroy_inodecache();
	454	}
	455
	456	module_init(init_bfs_fs)
	457	module_exit(exit_bfs_fs)