[mirror_ubuntu-artful-kernel.git] / fs / bfs / dir.c

/*
 *	fs/bfs/dir.c
 *	BFS directory operations.
 *	Copyright (C) 1999,2000  Tigran Aivazian <tigran@veritas.com>
 *      Made endianness-clean by Andrew Stribblehill <ads@wompom.org> 2005
 */

#include <linux/time.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
#include <linux/sched.h>
#include "bfs.h"

#undef DEBUG

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

static int bfs_add_entry(struct inode *dir, const unsigned char *name,
						int namelen, int ino);
static struct buffer_head *bfs_find_entry(struct inode *dir,
				const unsigned char *name, int namelen,
				struct bfs_dirent **res_dir);

static int bfs_readdir(struct file *f, void *dirent, filldir_t filldir)
{
	struct inode *dir = f->f_path.dentry->d_inode;
	struct buffer_head *bh;
	struct bfs_dirent *de;
	struct bfs_sb_info *info = BFS_SB(dir->i_sb);
	unsigned int offset;
	int block;

	mutex_lock(&info->bfs_lock);

	if (f->f_pos & (BFS_DIRENT_SIZE - 1)) {
		printf("Bad f_pos=%08lx for %s:%08lx\n",
					(unsigned long)f->f_pos,
					dir->i_sb->s_id, dir->i_ino);
		mutex_unlock(&info->bfs_lock);
		return -EBADF;
	}

	while (f->f_pos < dir->i_size) {
		offset = f->f_pos & (BFS_BSIZE - 1);
		block = BFS_I(dir)->i_sblock + (f->f_pos >> BFS_BSIZE_BITS);
		bh = sb_bread(dir->i_sb, block);
		if (!bh) {
			f->f_pos += BFS_BSIZE - offset;
			continue;
		}
		do {
			de = (struct bfs_dirent *)(bh->b_data + offset);
			if (de->ino) {
				int size = strnlen(de->name, BFS_NAMELEN);
				if (filldir(dirent, de->name, size, f->f_pos,
						le16_to_cpu(de->ino),
						DT_UNKNOWN) < 0) {
					brelse(bh);
					mutex_unlock(&info->bfs_lock);
					return 0;
				}
			}
			offset += BFS_DIRENT_SIZE;
			f->f_pos += BFS_DIRENT_SIZE;
		} while ((offset < BFS_BSIZE) && (f->f_pos < dir->i_size));
		brelse(bh);
	}

	mutex_unlock(&info->bfs_lock);
	return 0;	
}

const struct file_operations bfs_dir_operations = {
	.read		= generic_read_dir,
	.readdir	= bfs_readdir,
	.fsync		= file_fsync,
};

extern void dump_imap(const char *, struct super_block *);

static int bfs_create(struct inode *dir, struct dentry *dentry, int mode,
						struct nameidata *nd)
{
	int err;
	struct inode *inode;
	struct super_block *s = dir->i_sb;
	struct bfs_sb_info *info = BFS_SB(s);
	unsigned long ino;

	inode = new_inode(s);
	if (!inode)
		return -ENOSPC;
	mutex_lock(&info->bfs_lock);
	ino = find_first_zero_bit(info->si_imap, info->si_lasti);
	if (ino > info->si_lasti) {
		mutex_unlock(&info->bfs_lock);
		iput(inode);
		return -ENOSPC;
	}
	set_bit(ino, info->si_imap);
	info->si_freei--;
	inode->i_uid = current->fsuid;
	inode->i_gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
	inode->i_blocks = 0;
	inode->i_op = &bfs_file_inops;
	inode->i_fop = &bfs_file_operations;
	inode->i_mapping->a_ops = &bfs_aops;
	inode->i_mode = mode;
	inode->i_ino = ino;
	BFS_I(inode)->i_dsk_ino = ino;
	BFS_I(inode)->i_sblock = 0;
	BFS_I(inode)->i_eblock = 0;
	insert_inode_hash(inode);
        mark_inode_dirty(inode);
	dump_imap("create", s);

	err = bfs_add_entry(dir, dentry->d_name.name, dentry->d_name.len,
							inode->i_ino);
	if (err) {
		inode_dec_link_count(inode);
		mutex_unlock(&info->bfs_lock);
		iput(inode);
		return err;
	}
	mutex_unlock(&info->bfs_lock);
	d_instantiate(dentry, inode);
	return 0;
}

static struct dentry *bfs_lookup(struct inode *dir, struct dentry *dentry,
						struct nameidata *nd)
{
	struct inode *inode = NULL;
	struct buffer_head *bh;
	struct bfs_dirent *de;
	struct bfs_sb_info *info = BFS_SB(dir->i_sb);

	if (dentry->d_name.len > BFS_NAMELEN)
		return ERR_PTR(-ENAMETOOLONG);

	mutex_lock(&info->bfs_lock);
	bh = bfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len, &de);
	if (bh) {
		unsigned long ino = (unsigned long)le16_to_cpu(de->ino);
		brelse(bh);
		inode = bfs_iget(dir->i_sb, ino);
		if (IS_ERR(inode)) {
			mutex_unlock(&info->bfs_lock);
			return ERR_CAST(inode);
		}
	}
	mutex_unlock(&info->bfs_lock);
	d_add(dentry, inode);
	return NULL;
}

static int bfs_link(struct dentry *old, struct inode *dir,
						struct dentry *new)
{
	struct inode *inode = old->d_inode;
	struct bfs_sb_info *info = BFS_SB(inode->i_sb);
	int err;

	mutex_lock(&info->bfs_lock);
	err = bfs_add_entry(dir, new->d_name.name, new->d_name.len,
							inode->i_ino);
	if (err) {
		mutex_unlock(&info->bfs_lock);
		return err;
	}
	inc_nlink(inode);
	inode->i_ctime = CURRENT_TIME_SEC;
	mark_inode_dirty(inode);
	atomic_inc(&inode->i_count);
	d_instantiate(new, inode);
	mutex_unlock(&info->bfs_lock);
	return 0;
}

static int bfs_unlink(struct inode *dir, struct dentry *dentry)
{
	int error = -ENOENT;
	struct inode *inode = dentry->d_inode;
	struct buffer_head *bh;
	struct bfs_dirent *de;
	struct bfs_sb_info *info = BFS_SB(inode->i_sb);

	mutex_lock(&info->bfs_lock);
	bh = bfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len, &de);
	if (!bh || (le16_to_cpu(de->ino) != inode->i_ino))
		goto out_brelse;

	if (!inode->i_nlink) {
		printf("unlinking non-existent file %s:%lu (nlink=%d)\n",
					inode->i_sb->s_id, inode->i_ino,
					inode->i_nlink);
		inode->i_nlink = 1;
	}
	de->ino = 0;
	mark_buffer_dirty(bh);
	dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
	mark_inode_dirty(dir);
	inode->i_ctime = dir->i_ctime;
	inode_dec_link_count(inode);
	error = 0;

out_brelse:
	brelse(bh);
	mutex_unlock(&info->bfs_lock);
	return error;
}

static int bfs_rename(struct inode *old_dir, struct dentry *old_dentry,
			struct inode *new_dir, struct dentry *new_dentry)
{
	struct inode *old_inode, *new_inode;
	struct buffer_head *old_bh, *new_bh;
	struct bfs_dirent *old_de, *new_de;
	struct bfs_sb_info *info;
	int error = -ENOENT;

	old_bh = new_bh = NULL;
	old_inode = old_dentry->d_inode;
	if (S_ISDIR(old_inode->i_mode))
		return -EINVAL;

	info = BFS_SB(old_inode->i_sb);

	mutex_lock(&info->bfs_lock);
	old_bh = bfs_find_entry(old_dir, 
				old_dentry->d_name.name, 
				old_dentry->d_name.len, &old_de);

	if (!old_bh || (le16_to_cpu(old_de->ino) != old_inode->i_ino))
		goto end_rename;

	error = -EPERM;
	new_inode = new_dentry->d_inode;
	new_bh = bfs_find_entry(new_dir, 
				new_dentry->d_name.name, 
				new_dentry->d_name.len, &new_de);

	if (new_bh && !new_inode) {
		brelse(new_bh);
		new_bh = NULL;
	}
	if (!new_bh) {
		error = bfs_add_entry(new_dir, 
					new_dentry->d_name.name,
					new_dentry->d_name.len,
					old_inode->i_ino);
		if (error)
			goto end_rename;
	}
	old_de->ino = 0;
	old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC;
	mark_inode_dirty(old_dir);
	if (new_inode) {
		new_inode->i_ctime = CURRENT_TIME_SEC;
		inode_dec_link_count(new_inode);
	}
	mark_buffer_dirty(old_bh);
	error = 0;

end_rename:
	mutex_unlock(&info->bfs_lock);
	brelse(old_bh);
	brelse(new_bh);
	return error;
}

const struct inode_operations bfs_dir_inops = {
	.create			= bfs_create,
	.lookup			= bfs_lookup,
	.link			= bfs_link,
	.unlink			= bfs_unlink,
	.rename			= bfs_rename,
};

static int bfs_add_entry(struct inode *dir, const unsigned char *name,
							int namelen, int ino)
{
	struct buffer_head *bh;
	struct bfs_dirent *de;
	int block, sblock, eblock, off, pos;
	int i;

	dprintf("name=%s, namelen=%d\n", name, namelen);

	if (!namelen)
		return -ENOENT;
	if (namelen > BFS_NAMELEN)
		return -ENAMETOOLONG;

	sblock = BFS_I(dir)->i_sblock;
	eblock = BFS_I(dir)->i_eblock;
	for (block = sblock; block <= eblock; block++) {
		bh = sb_bread(dir->i_sb, block);
		if (!bh)
			return -ENOSPC;
		for (off = 0; off < BFS_BSIZE; off += BFS_DIRENT_SIZE) {
			de = (struct bfs_dirent *)(bh->b_data + off);
			if (!de->ino) {
				pos = (block - sblock) * BFS_BSIZE + off;
				if (pos >= dir->i_size) {
					dir->i_size += BFS_DIRENT_SIZE;
					dir->i_ctime = CURRENT_TIME_SEC;
				}
				dir->i_mtime = CURRENT_TIME_SEC;
				mark_inode_dirty(dir);
				de->ino = cpu_to_le16((u16)ino);
				for (i = 0; i < BFS_NAMELEN; i++)
					de->name[i] =
						(i < namelen) ? name[i] : 0;
				mark_buffer_dirty(bh);
				brelse(bh);
				return 0;
			}
		}
		brelse(bh);
	}
	return -ENOSPC;
}

static inline int bfs_namecmp(int len, const unsigned char *name,
							const char *buffer)
{
	if ((len < BFS_NAMELEN) && buffer[len])
		return 0;
	return !memcmp(name, buffer, len);
}

static struct buffer_head *bfs_find_entry(struct inode *dir,
			const unsigned char *name, int namelen,
			struct bfs_dirent **res_dir)
{
	unsigned long block = 0, offset = 0;
	struct buffer_head *bh = NULL;
	struct bfs_dirent *de;

	*res_dir = NULL;
	if (namelen > BFS_NAMELEN)
		return NULL;

	while (block * BFS_BSIZE + offset < dir->i_size) {
		if (!bh) {
			bh = sb_bread(dir->i_sb, BFS_I(dir)->i_sblock + block);
			if (!bh) {
				block++;
				continue;
			}
		}
		de = (struct bfs_dirent *)(bh->b_data + offset);
		offset += BFS_DIRENT_SIZE;
		if (le16_to_cpu(de->ino) &&
				bfs_namecmp(namelen, name, de->name)) {
			*res_dir = de;
			return bh;
		}
		if (offset < bh->b_size)
			continue;
		brelse(bh);
		bh = NULL;
		offset = 0;
		block++;
	}
	brelse(bh);
	return NULL;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* fs/bfs/dir.c
	3	* BFS directory operations.
	4	* Copyright (C) 1999,2000 Tigran Aivazian <tigran@veritas.com>
fac92bec	5	* Made endianness-clean by Andrew Stribblehill <ads@wompom.org> 2005
1da177e4 LT	6	*/
	7
	8	#include <linux/time.h>
	9	#include <linux/string.h>
	10	#include <linux/fs.h>
	11	#include <linux/smp_lock.h>
	12	#include <linux/buffer_head.h>
	13	#include <linux/sched.h>
	14	#include "bfs.h"
	15
	16	#undef DEBUG
	17
	18	#ifdef DEBUG
	19	#define dprintf(x...) printf(x)
	20	#else
	21	#define dprintf(x...)
	22	#endif
	23
f433dc56 DV	24	static int bfs_add_entry(struct inode dir, const unsigned char name,
	25	int namelen, int ino);
	26	static struct buffer_head bfs_find_entry(struct inode dir,
	27	const unsigned char *name, int namelen,
	28	struct bfs_dirent **res_dir);
1da177e4	29
f433dc56	30	static int bfs_readdir(struct file f, void dirent, filldir_t filldir)
1da177e4	31	{
f433dc56 DV	32	struct inode *dir = f->f_path.dentry->d_inode;
	33	struct buffer_head *bh;
	34	struct bfs_dirent *de;
3f165e4c	35	struct bfs_sb_info *info = BFS_SB(dir->i_sb);
1da177e4 LT	36	unsigned int offset;
	37	int block;
	38
3f165e4c	39	mutex_lock(&info->bfs_lock);
1da177e4	40
f433dc56 DV	41	if (f->f_pos & (BFS_DIRENT_SIZE - 1)) {
	42	printf("Bad f_pos=%08lx for %s:%08lx\n",
	43	(unsigned long)f->f_pos,
	44	dir->i_sb->s_id, dir->i_ino);
3f165e4c	45	mutex_unlock(&info->bfs_lock);
1da177e4 LT	46	return -EBADF;
	47	}
	48
	49	while (f->f_pos < dir->i_size) {
f433dc56	50	offset = f->f_pos & (BFS_BSIZE - 1);
1da177e4 LT	51	block = BFS_I(dir)->i_sblock + (f->f_pos >> BFS_BSIZE_BITS);
	52	bh = sb_bread(dir->i_sb, block);
	53	if (!bh) {
	54	f->f_pos += BFS_BSIZE - offset;
	55	continue;
	56	}
	57	do {
	58	de = (struct bfs_dirent *)(bh->b_data + offset);
	59	if (de->ino) {
	60	int size = strnlen(de->name, BFS_NAMELEN);
f433dc56 DV	61	if (filldir(dirent, de->name, size, f->f_pos,
	62	le16_to_cpu(de->ino),
	63	DT_UNKNOWN) < 0) {
1da177e4	64	brelse(bh);
3f165e4c	65	mutex_unlock(&info->bfs_lock);
1da177e4 LT	66	return 0;
	67	}
	68	}
	69	offset += BFS_DIRENT_SIZE;
	70	f->f_pos += BFS_DIRENT_SIZE;
f433dc56	71	} while ((offset < BFS_BSIZE) && (f->f_pos < dir->i_size));
1da177e4 LT	72	brelse(bh);
	73	}
	74
3f165e4c	75	mutex_unlock(&info->bfs_lock);
1da177e4 LT	76	return 0;
	77	}
	78
4b6f5d20	79	const struct file_operations bfs_dir_operations = {
1da177e4 LT	80	.read = generic_read_dir,
	81	.readdir = bfs_readdir,
	82	.fsync = file_fsync,
	83	};
	84
	85	extern void dump_imap(const char , struct super_block );
	86
f433dc56 DV	87	static int bfs_create(struct inode dir, struct dentry dentry, int mode,
f433dc56 DV	88	struct nameidata *nd)
1da177e4 LT	89	{
1da177e4 LT	90	int err;
f433dc56 DV	91	struct inode *inode;
	92	struct super_block *s = dir->i_sb;
	93	struct bfs_sb_info *info = BFS_SB(s);
1da177e4 LT	94	unsigned long ino;
	95
	96	inode = new_inode(s);
	97	if (!inode)
	98	return -ENOSPC;
3f165e4c	99	mutex_lock(&info->bfs_lock);
1da177e4 LT	100	ino = find_first_zero_bit(info->si_imap, info->si_lasti);
1da177e4 LT	101	if (ino > info->si_lasti) {
3f165e4c	102	mutex_unlock(&info->bfs_lock);
1da177e4 LT	103	iput(inode);
	104	return -ENOSPC;
	105	}
f433dc56	106	set_bit(ino, info->si_imap);
1da177e4 LT	107	info->si_freei--;
	108	inode->i_uid = current->fsuid;
	109	inode->i_gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
	110	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
ba52de12	111	inode->i_blocks = 0;
1da177e4 LT	112	inode->i_op = &bfs_file_inops;
	113	inode->i_fop = &bfs_file_operations;
	114	inode->i_mapping->a_ops = &bfs_aops;
	115	inode->i_mode = mode;
	116	inode->i_ino = ino;
ce0fe7e7	117	BFS_I(inode)->i_dsk_ino = ino;
1da177e4 LT	118	BFS_I(inode)->i_sblock = 0;
	119	BFS_I(inode)->i_eblock = 0;
	120	insert_inode_hash(inode);
	121	mark_inode_dirty(inode);
f433dc56	122	dump_imap("create", s);
1da177e4	123
f433dc56 DV	124	err = bfs_add_entry(dir, dentry->d_name.name, dentry->d_name.len,
f433dc56 DV	125	inode->i_ino);
1da177e4	126	if (err) {
9a53c3a7	127	inode_dec_link_count(inode);
3f165e4c	128	mutex_unlock(&info->bfs_lock);
1558182f	129	iput(inode);
1da177e4 LT	130	return err;
1da177e4 LT	131	}
3f165e4c	132	mutex_unlock(&info->bfs_lock);
1da177e4 LT	133	d_instantiate(dentry, inode);
	134	return 0;
	135	}
	136
f433dc56 DV	137	static struct dentry bfs_lookup(struct inode dir, struct dentry *dentry,
f433dc56 DV	138	struct nameidata *nd)
1da177e4	139	{
f433dc56 DV	140	struct inode *inode = NULL;
	141	struct buffer_head *bh;
	142	struct bfs_dirent *de;
3f165e4c	143	struct bfs_sb_info *info = BFS_SB(dir->i_sb);
1da177e4 LT	144
	145	if (dentry->d_name.len > BFS_NAMELEN)
	146	return ERR_PTR(-ENAMETOOLONG);
	147
3f165e4c	148	mutex_lock(&info->bfs_lock);
1da177e4 LT	149	bh = bfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len, &de);
1da177e4 LT	150	if (bh) {
fac92bec	151	unsigned long ino = (unsigned long)le16_to_cpu(de->ino);
1da177e4	152	brelse(bh);
e33ab086 DH	153	inode = bfs_iget(dir->i_sb, ino);
e33ab086 DH	154	if (IS_ERR(inode)) {
3f165e4c	155	mutex_unlock(&info->bfs_lock);
e33ab086	156	return ERR_CAST(inode);
1da177e4 LT	157	}
1da177e4 LT	158	}
3f165e4c	159	mutex_unlock(&info->bfs_lock);
1da177e4 LT	160	d_add(dentry, inode);
	161	return NULL;
	162	}
	163
f433dc56 DV	164	static int bfs_link(struct dentry old, struct inode dir,
f433dc56 DV	165	struct dentry *new)
1da177e4	166	{
f433dc56	167	struct inode *inode = old->d_inode;
3f165e4c	168	struct bfs_sb_info *info = BFS_SB(inode->i_sb);
1da177e4 LT	169	int err;
1da177e4 LT	170
3f165e4c	171	mutex_lock(&info->bfs_lock);
f433dc56 DV	172	err = bfs_add_entry(dir, new->d_name.name, new->d_name.len,
f433dc56 DV	173	inode->i_ino);
1da177e4	174	if (err) {
3f165e4c	175	mutex_unlock(&info->bfs_lock);
1da177e4 LT	176	return err;
1da177e4 LT	177	}
d8c76e6f	178	inc_nlink(inode);
1da177e4 LT	179	inode->i_ctime = CURRENT_TIME_SEC;
	180	mark_inode_dirty(inode);
	181	atomic_inc(&inode->i_count);
	182	d_instantiate(new, inode);
3f165e4c	183	mutex_unlock(&info->bfs_lock);
1da177e4 LT	184	return 0;
	185	}
	186
f433dc56	187	static int bfs_unlink(struct inode dir, struct dentry dentry)
1da177e4 LT	188	{
1da177e4 LT	189	int error = -ENOENT;
3f165e4c	190	struct inode *inode = dentry->d_inode;
f433dc56 DV	191	struct buffer_head *bh;
f433dc56 DV	192	struct bfs_dirent *de;
3f165e4c	193	struct bfs_sb_info *info = BFS_SB(inode->i_sb);
1da177e4	194
3f165e4c	195	mutex_lock(&info->bfs_lock);
1da177e4	196	bh = bfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len, &de);
f433dc56	197	if (!bh \|\| (le16_to_cpu(de->ino) != inode->i_ino))
1da177e4 LT	198	goto out_brelse;
	199
	200	if (!inode->i_nlink) {
f433dc56 DV	201	printf("unlinking non-existent file %s:%lu (nlink=%d)\n",
	202	inode->i_sb->s_id, inode->i_ino,
	203	inode->i_nlink);
1da177e4 LT	204	inode->i_nlink = 1;
	205	}
	206	de->ino = 0;
	207	mark_buffer_dirty(bh);
	208	dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
	209	mark_inode_dirty(dir);
1da177e4	210	inode->i_ctime = dir->i_ctime;
9a53c3a7	211	inode_dec_link_count(inode);
1da177e4 LT	212	error = 0;
	213
	214	out_brelse:
	215	brelse(bh);
3f165e4c	216	mutex_unlock(&info->bfs_lock);
1da177e4 LT	217	return error;
	218	}
	219
f433dc56 DV	220	static int bfs_rename(struct inode old_dir, struct dentry old_dentry,
f433dc56 DV	221	struct inode new_dir, struct dentry new_dentry)
1da177e4	222	{
f433dc56 DV	223	struct inode old_inode, new_inode;
	224	struct buffer_head old_bh, new_bh;
	225	struct bfs_dirent old_de, new_de;
3f165e4c	226	struct bfs_sb_info *info;
1da177e4 LT	227	int error = -ENOENT;
	228
	229	old_bh = new_bh = NULL;
	230	old_inode = old_dentry->d_inode;
	231	if (S_ISDIR(old_inode->i_mode))
	232	return -EINVAL;
	233
3f165e4c DV	234	info = BFS_SB(old_inode->i_sb);
	235
	236	mutex_lock(&info->bfs_lock);
1da177e4 LT	237	old_bh = bfs_find_entry(old_dir,
	238	old_dentry->d_name.name,
	239	old_dentry->d_name.len, &old_de);
	240
f433dc56	241	if (!old_bh \|\| (le16_to_cpu(old_de->ino) != old_inode->i_ino))
1da177e4 LT	242	goto end_rename;
	243
	244	error = -EPERM;
	245	new_inode = new_dentry->d_inode;
	246	new_bh = bfs_find_entry(new_dir,
	247	new_dentry->d_name.name,
	248	new_dentry->d_name.len, &new_de);
	249
	250	if (new_bh && !new_inode) {
	251	brelse(new_bh);
	252	new_bh = NULL;
	253	}
	254	if (!new_bh) {
	255	error = bfs_add_entry(new_dir,
	256	new_dentry->d_name.name,
f433dc56 DV	257	new_dentry->d_name.len,
f433dc56 DV	258	old_inode->i_ino);
1da177e4 LT	259	if (error)
	260	goto end_rename;
	261	}
	262	old_de->ino = 0;
	263	old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC;
	264	mark_inode_dirty(old_dir);
	265	if (new_inode) {
1da177e4	266	new_inode->i_ctime = CURRENT_TIME_SEC;
9a53c3a7	267	inode_dec_link_count(new_inode);
1da177e4 LT	268	}
	269	mark_buffer_dirty(old_bh);
	270	error = 0;
	271
	272	end_rename:
3f165e4c	273	mutex_unlock(&info->bfs_lock);
1da177e4 LT	274	brelse(old_bh);
	275	brelse(new_bh);
	276	return error;
	277	}
	278
754661f1	279	const struct inode_operations bfs_dir_inops = {
1da177e4 LT	280	.create = bfs_create,
	281	.lookup = bfs_lookup,
	282	.link = bfs_link,
	283	.unlink = bfs_unlink,
	284	.rename = bfs_rename,
	285	};
	286
f433dc56 DV	287	static int bfs_add_entry(struct inode dir, const unsigned char name,
f433dc56 DV	288	int namelen, int ino)
1da177e4	289	{
f433dc56 DV	290	struct buffer_head *bh;
	291	struct bfs_dirent *de;
	292	int block, sblock, eblock, off, pos;
1da177e4 LT	293	int i;
	294
	295	dprintf("name=%s, namelen=%d\n", name, namelen);
	296
	297	if (!namelen)
	298	return -ENOENT;
	299	if (namelen > BFS_NAMELEN)
	300	return -ENAMETOOLONG;
	301
	302	sblock = BFS_I(dir)->i_sblock;
	303	eblock = BFS_I(dir)->i_eblock;
f433dc56	304	for (block = sblock; block <= eblock; block++) {
1da177e4	305	bh = sb_bread(dir->i_sb, block);
f433dc56	306	if (!bh)
1da177e4	307	return -ENOSPC;
f433dc56	308	for (off = 0; off < BFS_BSIZE; off += BFS_DIRENT_SIZE) {
1da177e4	309	de = (struct bfs_dirent *)(bh->b_data + off);
1da177e4	310	if (!de->ino) {
f433dc56 DV	311	pos = (block - sblock) * BFS_BSIZE + off;
f433dc56 DV	312	if (pos >= dir->i_size) {
1da177e4 LT	313	dir->i_size += BFS_DIRENT_SIZE;
	314	dir->i_ctime = CURRENT_TIME_SEC;
	315	}
	316	dir->i_mtime = CURRENT_TIME_SEC;
	317	mark_inode_dirty(dir);
fac92bec	318	de->ino = cpu_to_le16((u16)ino);
f433dc56 DV	319	for (i = 0; i < BFS_NAMELEN; i++)
	320	de->name[i] =
	321	(i < namelen) ? name[i] : 0;
1da177e4 LT	322	mark_buffer_dirty(bh);
	323	brelse(bh);
	324	return 0;
	325	}
	326	}
	327	brelse(bh);
	328	}
	329	return -ENOSPC;
	330	}
	331
f433dc56 DV	332	static inline int bfs_namecmp(int len, const unsigned char *name,
f433dc56 DV	333	const char *buffer)
1da177e4	334	{
f433dc56	335	if ((len < BFS_NAMELEN) && buffer[len])
1da177e4 LT	336	return 0;
	337	return !memcmp(name, buffer, len);
	338	}
	339
f433dc56 DV	340	static struct buffer_head bfs_find_entry(struct inode dir,
	341	const unsigned char *name, int namelen,
	342	struct bfs_dirent **res_dir)
1da177e4	343	{
f433dc56 DV	344	unsigned long block = 0, offset = 0;
	345	struct buffer_head *bh = NULL;
	346	struct bfs_dirent *de;
1da177e4 LT	347
	348	*res_dir = NULL;
	349	if (namelen > BFS_NAMELEN)
	350	return NULL;
f433dc56	351
1da177e4 LT	352	while (block * BFS_BSIZE + offset < dir->i_size) {
	353	if (!bh) {
	354	bh = sb_bread(dir->i_sb, BFS_I(dir)->i_sblock + block);
	355	if (!bh) {
	356	block++;
	357	continue;
	358	}
	359	}
	360	de = (struct bfs_dirent *)(bh->b_data + offset);
	361	offset += BFS_DIRENT_SIZE;
f433dc56 DV	362	if (le16_to_cpu(de->ino) &&
f433dc56 DV	363	bfs_namecmp(namelen, name, de->name)) {
1da177e4 LT	364	*res_dir = de;
	365	return bh;
	366	}
	367	if (offset < bh->b_size)
	368	continue;
	369	brelse(bh);
	370	bh = NULL;
	371	offset = 0;
	372	block++;
	373	}
	374	brelse(bh);
	375	return NULL;
	376	}