[mirror_ubuntu-jammy-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;
	struct bfs_sb_info *info = BFS_SB(inode->i_sb);

        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);
	brelse(bh);
	mutex_unlock(&info->bfs_lock);
	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;
	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 void bfs_put_super(struct super_block *s)
{
	struct bfs_sb_info *info = BFS_SB(s);

	brelse(info->si_sbh);
	mutex_destroy(&info->bfs_lock);
	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)
{
	struct bfs_sb_info *info = BFS_SB(s);

	mutex_lock(&info->bfs_lock);
	if (!(s->s_flags & MS_RDONLY))
		mark_buffer_dirty(info->si_sbh);
	s->s_dirt = 0;
	mutex_unlock(&info->bfs_lock);
}

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);
	mutex_init(&info->bfs_lock);
	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	106	int block, off;
3f165e4c	107	struct bfs_sb_info *info = BFS_SB(inode->i_sb);
1da177e4	108
fac92bec AS	109	dprintf("ino=%08x\n", ino);
fac92bec AS	110
f433dc56	111	if ((ino < BFS_ROOT_INO) \|\| (ino > BFS_SB(inode->i_sb)->si_lasti)) {
fac92bec	112	printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino);
1da177e4 LT	113	return -EIO;
	114	}
	115
3f165e4c	116	mutex_lock(&info->bfs_lock);
f433dc56	117	block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
1da177e4 LT	118	bh = sb_bread(inode->i_sb, block);
1da177e4 LT	119	if (!bh) {
f433dc56 DV	120	printf("Unable to read inode %s:%08x\n",
f433dc56 DV	121	inode->i_sb->s_id, ino);
3f165e4c	122	mutex_unlock(&info->bfs_lock);
1da177e4 LT	123	return -EIO;
	124	}
	125
f433dc56	126	off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
1da177e4 LT	127	di = (struct bfs_inode *)bh->b_data + off;
1da177e4 LT	128
fac92bec AS	129	if (ino == BFS_ROOT_INO)
fac92bec AS	130	di->i_vtype = cpu_to_le32(BFS_VDIR);
1da177e4	131	else
fac92bec AS	132	di->i_vtype = cpu_to_le32(BFS_VREG);
	133
	134	di->i_ino = cpu_to_le16(ino);
	135	di->i_mode = cpu_to_le32(inode->i_mode);
	136	di->i_uid = cpu_to_le32(inode->i_uid);
	137	di->i_gid = cpu_to_le32(inode->i_gid);
	138	di->i_nlink = cpu_to_le32(inode->i_nlink);
	139	di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
	140	di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
	141	di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
	142	i_sblock = BFS_I(inode)->i_sblock;
	143	di->i_sblock = cpu_to_le32(i_sblock);
	144	di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
	145	di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);
1da177e4 LT	146
	147	mark_buffer_dirty(bh);
	148	brelse(bh);
3f165e4c	149	mutex_unlock(&info->bfs_lock);
1da177e4 LT	150	return 0;
	151	}
	152
f433dc56	153	static void bfs_delete_inode(struct inode *inode)
1da177e4 LT	154	{
1da177e4 LT	155	unsigned long ino = inode->i_ino;
f433dc56 DV	156	struct bfs_inode *di;
f433dc56 DV	157	struct buffer_head *bh;
1da177e4	158	int block, off;
f433dc56 DV	159	struct super_block *s = inode->i_sb;
	160	struct bfs_sb_info *info = BFS_SB(s);
	161	struct bfs_inode_info *bi = BFS_I(inode);
1da177e4	162
fac92bec	163	dprintf("ino=%08lx\n", ino);
1da177e4	164
fef26658 MF	165	truncate_inode_pages(&inode->i_data, 0);
fef26658 MF	166
f433dc56	167	if ((ino < BFS_ROOT_INO) \|\| (ino > info->si_lasti)) {
fac92bec	168	printf("invalid ino=%08lx\n", ino);
1da177e4 LT	169	return;
	170	}
	171
	172	inode->i_size = 0;
	173	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
3f165e4c	174	mutex_lock(&info->bfs_lock);
1da177e4	175	mark_inode_dirty(inode);
f433dc56 DV	176
f433dc56 DV	177	block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
1da177e4 LT	178	bh = sb_bread(s, block);
1da177e4 LT	179	if (!bh) {
f433dc56 DV	180	printf("Unable to read inode %s:%08lx\n",
f433dc56 DV	181	inode->i_sb->s_id, ino);
3f165e4c	182	mutex_unlock(&info->bfs_lock);
1da177e4 LT	183	return;
1da177e4 LT	184	}
f433dc56 DV	185	off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
	186	di = (struct bfs_inode *)bh->b_data + off;
	187	memset((void *)di, 0, sizeof(struct bfs_inode));
	188	mark_buffer_dirty(bh);
	189	brelse(bh);
	190
fac92bec	191	if (bi->i_dsk_ino) {
7e46aa5c AV	192	if (bi->i_sblock)
7e46aa5c AV	193	info->si_freeb += bi->i_eblock + 1 - bi->i_sblock;
1da177e4	194	info->si_freei++;
fac92bec	195	clear_bit(ino, info->si_imap);
1da177e4	196	dump_imap("delete_inode", s);
fac92bec	197	}
1da177e4	198
f433dc56 DV	199	/*
	200	* If this was the last file, make the previous block
	201	* "last block of the last file" even if there is no
	202	* real file there, saves us 1 gap.
	203	*/
	204	if (info->si_lf_eblk == bi->i_eblock) {
	205	info->si_lf_eblk = bi->i_sblock - 1;
1da177e4 LT	206	mark_buffer_dirty(info->si_sbh);
1da177e4 LT	207	}
3f165e4c	208	mutex_unlock(&info->bfs_lock);
1da177e4 LT	209	clear_inode(inode);
	210	}
	211
	212	static void bfs_put_super(struct super_block *s)
	213	{
	214	struct bfs_sb_info *info = BFS_SB(s);
3f165e4c	215
1da177e4	216	brelse(info->si_sbh);
3f165e4c	217	mutex_destroy(&info->bfs_lock);
1da177e4 LT	218	kfree(info->si_imap);
	219	kfree(info);
	220	s->s_fs_info = NULL;
	221	}
	222
726c3342	223	static int bfs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	224	{
726c3342	225	struct super_block *s = dentry->d_sb;
1da177e4 LT	226	struct bfs_sb_info *info = BFS_SB(s);
	227	u64 id = huge_encode_dev(s->s_bdev->bd_dev);
	228	buf->f_type = BFS_MAGIC;
	229	buf->f_bsize = s->s_blocksize;
	230	buf->f_blocks = info->si_blocks;
	231	buf->f_bfree = buf->f_bavail = info->si_freeb;
	232	buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
	233	buf->f_ffree = info->si_freei;
	234	buf->f_fsid.val[0] = (u32)id;
	235	buf->f_fsid.val[1] = (u32)(id >> 32);
	236	buf->f_namelen = BFS_NAMELEN;
	237	return 0;
	238	}
	239
	240	static void bfs_write_super(struct super_block *s)
	241	{
3f165e4c DV	242	struct bfs_sb_info *info = BFS_SB(s);
	243
	244	mutex_lock(&info->bfs_lock);
1da177e4	245	if (!(s->s_flags & MS_RDONLY))
3f165e4c	246	mark_buffer_dirty(info->si_sbh);
1da177e4	247	s->s_dirt = 0;
3f165e4c	248	mutex_unlock(&info->bfs_lock);
1da177e4 LT	249	}
1da177e4 LT	250
f433dc56	251	static struct kmem_cache *bfs_inode_cachep;
1da177e4 LT	252
	253	static struct inode bfs_alloc_inode(struct super_block sb)
	254	{
	255	struct bfs_inode_info *bi;
e94b1766	256	bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL);
1da177e4 LT	257	if (!bi)
	258	return NULL;
	259	return &bi->vfs_inode;
	260	}
	261
	262	static void bfs_destroy_inode(struct inode *inode)
	263	{
	264	kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
	265	}
	266
4ba9b9d0	267	static void init_once(struct kmem_cache cachep, void foo)
1da177e4 LT	268	{
	269	struct bfs_inode_info *bi = foo;
	270
a35afb83	271	inode_init_once(&bi->vfs_inode);
1da177e4	272	}
20c2df83	273
1da177e4 LT	274	static int init_inodecache(void)
	275	{
	276	bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
	277	sizeof(struct bfs_inode_info),
fffb60f9 PJ	278	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	279	SLAB_MEM_SPREAD),
20c2df83	280	init_once);
1da177e4 LT	281	if (bfs_inode_cachep == NULL)
	282	return -ENOMEM;
	283	return 0;
	284	}
	285
	286	static void destroy_inodecache(void)
	287	{
1a1d92c1	288	kmem_cache_destroy(bfs_inode_cachep);
1da177e4 LT	289	}
1da177e4 LT	290
ee9b6d61	291	static const struct super_operations bfs_sops = {
1da177e4 LT	292	.alloc_inode = bfs_alloc_inode,
1da177e4 LT	293	.destroy_inode = bfs_destroy_inode,
1da177e4 LT	294	.write_inode = bfs_write_inode,
	295	.delete_inode = bfs_delete_inode,
	296	.put_super = bfs_put_super,
	297	.write_super = bfs_write_super,
	298	.statfs = bfs_statfs,
	299	};
	300
f433dc56	301	void dump_imap(const char prefix, struct super_block s)
1da177e4	302	{
fac92bec	303	#ifdef DEBUG
1da177e4 LT	304	int i;
	305	char tmpbuf = (char )get_zeroed_page(GFP_KERNEL);
	306
	307	if (!tmpbuf)
	308	return;
f433dc56 DV	309	for (i = BFS_SB(s)->si_lasti; i >= 0; i--) {
f433dc56 DV	310	if (i > PAGE_SIZE - 100) break;
1da177e4 LT	311	if (test_bit(i, BFS_SB(s)->si_imap))
	312	strcat(tmpbuf, "1");
	313	else
	314	strcat(tmpbuf, "0");
	315	}
f433dc56 DV	316	printf("BFS-fs: %s: lasti=%08lx <%s>\n",
f433dc56 DV	317	prefix, BFS_SB(s)->si_lasti, tmpbuf);
1da177e4 LT	318	free_page((unsigned long)tmpbuf);
	319	#endif
	320	}
	321
	322	static int bfs_fill_super(struct super_block s, void data, int silent)
	323	{
f433dc56 DV	324	struct buffer_head *bh;
	325	struct bfs_super_block *bfs_sb;
	326	struct inode *inode;
fac92bec	327	unsigned i, imap_len;
f433dc56	328	struct bfs_sb_info *info;
e33ab086	329	long ret = -EINVAL;
1da177e4	330
f8314dc6	331	info = kzalloc(sizeof(*info), GFP_KERNEL);
1da177e4 LT	332	if (!info)
	333	return -ENOMEM;
	334	s->s_fs_info = info;
1da177e4 LT	335
	336	sb_set_blocksize(s, BFS_BSIZE);
	337
	338	bh = sb_bread(s, 0);
	339	if(!bh)
	340	goto out;
	341	bfs_sb = (struct bfs_super_block *)bh->b_data;
fac92bec	342	if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
1da177e4 LT	343	if (!silent)
1da177e4 LT	344	printf("No BFS filesystem on %s (magic=%08x)\n",
fac92bec	345	s->s_id, le32_to_cpu(bfs_sb->s_magic));
1da177e4 LT	346	goto out;
	347	}
	348	if (BFS_UNCLEAN(bfs_sb, s) && !silent)
	349	printf("%s is unclean, continuing\n", s->s_id);
	350
	351	s->s_magic = BFS_MAGIC;
1da177e4	352	info->si_sbh = bh;
f433dc56 DV	353	info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
	354	sizeof(struct bfs_inode)
	355	+ BFS_ROOT_INO - 1;
	356	imap_len = (info->si_lasti / 8) + 1;
f8314dc6	357	info->si_imap = kzalloc(imap_len, GFP_KERNEL);
1da177e4 LT	358	if (!info->si_imap)
1da177e4 LT	359	goto out;
f433dc56	360	for (i = 0; i < BFS_ROOT_INO; i++)
1da177e4 LT	361	set_bit(i, info->si_imap);
	362
	363	s->s_op = &bfs_sops;
e33ab086 DH	364	inode = bfs_iget(s, BFS_ROOT_INO);
	365	if (IS_ERR(inode)) {
	366	ret = PTR_ERR(inode);
1da177e4 LT	367	kfree(info->si_imap);
	368	goto out;
	369	}
	370	s->s_root = d_alloc_root(inode);
	371	if (!s->s_root) {
	372	iput(inode);
e33ab086	373	ret = -ENOMEM;
1da177e4 LT	374	kfree(info->si_imap);
	375	goto out;
	376	}
	377
f433dc56 DV	378	info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
	379	info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1
	380	- le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
1da177e4 LT	381	info->si_freei = 0;
1da177e4 LT	382	info->si_lf_eblk = 0;
c2b513df	383	bh = NULL;
f433dc56	384	for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
c2b513df	385	struct bfs_inode *di;
f433dc56	386	int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
c2b513df	387	int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
75b25b4c	388	unsigned long eblock;
c2b513df AV	389
	390	if (!off) {
	391	brelse(bh);
	392	bh = sb_bread(s, block);
	393	}
	394
	395	if (!bh)
	396	continue;
	397
	398	di = (struct bfs_inode *)bh->b_data + off;
	399
	400	if (!di->i_ino) {
1da177e4	401	info->si_freei++;
c2b513df AV	402	continue;
	403	}
	404	set_bit(i, info->si_imap);
	405	info->si_freeb -= BFS_FILEBLOCKS(di);
	406
c2b513df	407	eblock = le32_to_cpu(di->i_eblock);
f433dc56	408	if (eblock > info->si_lf_eblk)
c2b513df	409	info->si_lf_eblk = eblock;
1da177e4	410	}
c2b513df	411	brelse(bh);
1da177e4	412	if (!(s->s_flags & MS_RDONLY)) {
c2b513df	413	mark_buffer_dirty(info->si_sbh);
1da177e4 LT	414	s->s_dirt = 1;
	415	}
	416	dump_imap("read_super", s);
3f165e4c	417	mutex_init(&info->bfs_lock);
1da177e4 LT	418	return 0;
	419
	420	out:
	421	brelse(bh);
	422	kfree(info);
	423	s->s_fs_info = NULL;
e33ab086	424	return ret;
1da177e4 LT	425	}
1da177e4 LT	426
454e2398 DH	427	static int bfs_get_sb(struct file_system_type *fs_type,
454e2398 DH	428	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	429	{
454e2398	430	return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt);
1da177e4 LT	431	}
	432
	433	static struct file_system_type bfs_fs_type = {
	434	.owner = THIS_MODULE,
	435	.name = "bfs",
	436	.get_sb = bfs_get_sb,
	437	.kill_sb = kill_block_super,
	438	.fs_flags = FS_REQUIRES_DEV,
	439	};
	440
	441	static int __init init_bfs_fs(void)
	442	{
	443	int err = init_inodecache();
	444	if (err)
	445	goto out1;
	446	err = register_filesystem(&bfs_fs_type);
	447	if (err)
	448	goto out;
	449	return 0;
	450	out:
	451	destroy_inodecache();
	452	out1:
	453	return err;
	454	}
	455
	456	static void __exit exit_bfs_fs(void)
	457	{
	458	unregister_filesystem(&bfs_fs_type);
	459	destroy_inodecache();
	460	}
	461
	462	module_init(init_bfs_fs)
	463	module_exit(exit_bfs_fs)