Commit message: ext4: Add sanity check to make_indexed_dir

Make sure the rec_len field in the '..' entry is sane, lest we overrun
the directory block and cause a kernel oops on a purposefully
corrupted filesystem.

Thanks to Sami Liedes for reporting this bug.

http://bugzilla.kernel.org/show_bug.cgi?id=12430

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org
CVE: CVE-2009-0746
CWE: CWE-20
Vulnerability description: The make_indexed_dir function in fs/ext4/namei.c in the Linux kernel 2.6.27 before 2.6.27.19 and 2.6.28 before 2.6.28.7 does not validate a certain rec_len field, which allows local users to cause a denial of service (OOPS) by attempting to mount a crafted ext4 filesystem.

Project: linux-2.6

dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count)
{
	unsigned rec_len = 0;

	while (count--) {
		struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *) (from + map->offs);
		rec_len = EXT4_DIR_REC_LEN(de->name_len);
		memcpy (to, de, rec_len);
		((struct ext4_dir_entry_2 *) to)->rec_len =
				ext4_rec_len_to_disk(rec_len);
		de->inode = 0;
		map++;
		to += rec_len;
	}
	return (struct ext4_dir_entry_2 *) (to - rec_len);
}

Project: linux-2.6

static int htree_dirblock_to_tree(struct file *dir_file,
				  struct inode *dir, ext4_lblk_t block,
				  struct dx_hash_info *hinfo,
				  __u32 start_hash, __u32 start_minor_hash)
{
	struct buffer_head *bh;
	struct ext4_dir_entry_2 *de, *top;
	int err, count = 0;

	dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n",
							(unsigned long)block));
	if (!(bh = ext4_bread (NULL, dir, block, 0, &err)))
		return err;

	de = (struct ext4_dir_entry_2 *) bh->b_data;
	top = (struct ext4_dir_entry_2 *) ((char *) de +
					   dir->i_sb->s_blocksize -
					   EXT4_DIR_REC_LEN(0));
	for (; de < top; de = ext4_next_entry(de)) {
		if (!ext4_check_dir_entry("htree_dirblock_to_tree", dir, de, bh,
					(block<<EXT4_BLOCK_SIZE_BITS(dir->i_sb))
						+((char *)de - bh->b_data))) {
			/* On error, skip the f_pos to the next block. */
			dir_file->f_pos = (dir_file->f_pos |
					(dir->i_sb->s_blocksize - 1)) + 1;
			brelse(bh);
			return count;
		}
		ext4fs_dirhash(de->name, de->name_len, hinfo);
		if ((hinfo->hash < start_hash) ||
		    ((hinfo->hash == start_hash) &&
		     (hinfo->minor_hash < start_minor_hash)))
			continue;
		if (de->inode == 0)
			continue;
		if ((err = ext4_htree_store_dirent(dir_file,
				   hinfo->hash, hinfo->minor_hash, de)) != 0) {
			brelse(bh);
			return err;
		}
		count++;
	}
	brelse(bh);
	return count;
}

Project: linux-2.6

static struct ext4_dir_entry_2* dx_pack_dirents(char *base, int size)
{
	struct ext4_dir_entry_2 *next, *to, *prev, *de = (struct ext4_dir_entry_2 *) base;
	unsigned rec_len = 0;

	prev = to = de;
	while ((char*)de < base + size) {
		next = ext4_next_entry(de);
		if (de->inode && de->name_len) {
			rec_len = EXT4_DIR_REC_LEN(de->name_len);
			if (de > to)
				memmove(to, de, rec_len);
			to->rec_len = ext4_rec_len_to_disk(rec_len);
			prev = to;
			to = (struct ext4_dir_entry_2 *) (((char *) to) + rec_len);
		}
		de = next;
	}
	return prev;
}

Project: linux-2.6

struct dentry *ext4_get_parent(struct dentry *child)
{
	__u32 ino;
	struct inode *inode;
	static const struct qstr dotdot = {
		.name = "..",
		.len = 2,
	};
	struct ext4_dir_entry_2 * de;
	struct buffer_head *bh;

	bh = ext4_find_entry(child->d_inode, &dotdot, &de);
	inode = NULL;
	if (!bh)
		return ERR_PTR(-ENOENT);
	ino = le32_to_cpu(de->inode);
	brelse(bh);

	if (!ext4_valid_inum(child->d_inode->i_sb, ino)) {
		ext4_error(child->d_inode->i_sb, "ext4_get_parent",
			   "bad inode number: %u", ino);
		return ERR_PTR(-EIO);
	}

	return d_obtain_alias(ext4_iget(child->d_inode->i_sb, ino));
}

Project: linux-2.6

static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
			struct buffer_head **bh,struct dx_frame *frame,
			struct dx_hash_info *hinfo, int *error)
{
	unsigned blocksize = dir->i_sb->s_blocksize;
	unsigned count, continued;
	struct buffer_head *bh2;
	ext4_lblk_t newblock;
	u32 hash2;
	struct dx_map_entry *map;
	char *data1 = (*bh)->b_data, *data2;
	unsigned split, move, size;
	struct ext4_dir_entry_2 *de = NULL, *de2;
	int	err = 0, i;

	bh2 = ext4_append (handle, dir, &newblock, &err);
	if (!(bh2)) {
		brelse(*bh);
		*bh = NULL;
		goto errout;
	}

	BUFFER_TRACE(*bh, "get_write_access");
	err = ext4_journal_get_write_access(handle, *bh);
	if (err)
		goto journal_error;

	BUFFER_TRACE(frame->bh, "get_write_access");
	err = ext4_journal_get_write_access(handle, frame->bh);
	if (err)
		goto journal_error;

	data2 = bh2->b_data;

	/* create map in the end of data2 block */
	map = (struct dx_map_entry *) (data2 + blocksize);
	count = dx_make_map((struct ext4_dir_entry_2 *) data1,
			     blocksize, hinfo, map);
	map -= count;
	dx_sort_map(map, count);
	/* Split the existing block in the middle, size-wise */
	size = 0;
	move = 0;
	for (i = count-1; i >= 0; i--) {
		/* is more than half of this entry in 2nd half of the block? */
		if (size + map[i].size/2 > blocksize/2)
			break;
		size += map[i].size;
		move++;
	}
	/* map index at which we will split */
	split = count - move;
	hash2 = map[split].hash;
	continued = hash2 == map[split - 1].hash;
	dxtrace(printk(KERN_INFO "Split block %lu at %x, %i/%i\n",
			(unsigned long)dx_get_block(frame->at),
					hash2, split, count-split));

	/* Fancy dance to stay within two buffers */
	de2 = dx_move_dirents(data1, data2, map + split, count - split);
	de = dx_pack_dirents(data1, blocksize);
	de->rec_len = ext4_rec_len_to_disk(data1 + blocksize - (char *) de);
	de2->rec_len = ext4_rec_len_to_disk(data2 + blocksize - (char *) de2);
	dxtrace(dx_show_leaf (hinfo, (struct ext4_dir_entry_2 *) data1, blocksize, 1));
	dxtrace(dx_show_leaf (hinfo, (struct ext4_dir_entry_2 *) data2, blocksize, 1));

	/* Which block gets the new entry? */
	if (hinfo->hash >= hash2)
	{
		swap(*bh, bh2);
		de = de2;
	}
	dx_insert_block(frame, hash2 + continued, newblock);
	err = ext4_handle_dirty_metadata(handle, dir, bh2);
	if (err)
		goto journal_error;
	err = ext4_handle_dirty_metadata(handle, dir, frame->bh);
	if (err)
		goto journal_error;
	brelse(bh2);
	dxtrace(dx_show_index("frame", frame->entries));
	return de;

journal_error:
	brelse(*bh);
	brelse(bh2);
	*bh = NULL;
	ext4_std_error(dir->i_sb, err);
errout:
	*error = err;
	return NULL;
}

Project: linux-2.6

static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry,
			     struct inode *inode, struct ext4_dir_entry_2 *de,
			     struct buffer_head *bh)
{
	struct inode	*dir = dentry->d_parent->d_inode;
	const char	*name = dentry->d_name.name;
	int		namelen = dentry->d_name.len;
	unsigned int	offset = 0;
	unsigned short	reclen;
	int		nlen, rlen, err;
	char		*top;

	reclen = EXT4_DIR_REC_LEN(namelen);
	if (!de) {
		de = (struct ext4_dir_entry_2 *)bh->b_data;
		top = bh->b_data + dir->i_sb->s_blocksize - reclen;
		while ((char *) de <= top) {
			if (!ext4_check_dir_entry("ext4_add_entry", dir, de,
						  bh, offset)) {
				brelse(bh);
				return -EIO;
			}
			if (ext4_match(namelen, name, de)) {
				brelse(bh);
				return -EEXIST;
			}
			nlen = EXT4_DIR_REC_LEN(de->name_len);
			rlen = ext4_rec_len_from_disk(de->rec_len);
			if ((de->inode? rlen - nlen: rlen) >= reclen)
				break;
			de = (struct ext4_dir_entry_2 *)((char *)de + rlen);
			offset += rlen;
		}
		if ((char *) de > top)
			return -ENOSPC;
	}
	BUFFER_TRACE(bh, "get_write_access");
	err = ext4_journal_get_write_access(handle, bh);
	if (err) {
		ext4_std_error(dir->i_sb, err);
		brelse(bh);
		return err;
	}

	/* By now the buffer is marked for journaling */
	nlen = EXT4_DIR_REC_LEN(de->name_len);
	rlen = ext4_rec_len_from_disk(de->rec_len);
	if (de->inode) {
		struct ext4_dir_entry_2 *de1 = (struct ext4_dir_entry_2 *)((char *)de + nlen);
		de1->rec_len = ext4_rec_len_to_disk(rlen - nlen);
		de->rec_len = ext4_rec_len_to_disk(nlen);
		de = de1;
	}
	de->file_type = EXT4_FT_UNKNOWN;
	if (inode) {
		de->inode = cpu_to_le32(inode->i_ino);
		ext4_set_de_type(dir->i_sb, de, inode->i_mode);
	} else
		de->inode = 0;
	de->name_len = namelen;
	memcpy(de->name, name, namelen);
	/*
	 * XXX shouldn't update any times until successful
	 * completion of syscall, but too many callers depend
	 * on this.
	 *
	 * XXX similarly, too many callers depend on
	 * ext4_new_inode() setting the times, but error
	 * recovery deletes the inode, so the worst that can
	 * happen is that the times are slightly out of date
	 * and/or different from the directory change time.
	 */
	dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
	ext4_update_dx_flag(dir);
	dir->i_version++;
	ext4_mark_inode_dirty(handle, dir);
	BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
	err = ext4_handle_dirty_metadata(handle, dir, bh);
	if (err)
		ext4_std_error(dir->i_sb, err);
	brelse(bh);
	return 0;
}

Project: linux-2.6

int ext4_orphan_del(handle_t *handle, struct inode *inode)
{
	struct list_head *prev;
	struct ext4_inode_info *ei = EXT4_I(inode);
	struct ext4_sb_info *sbi;
	__u32 ino_next;
	struct ext4_iloc iloc;
	int err = 0;

	if (!ext4_handle_valid(handle))
		return 0;

	lock_super(inode->i_sb);
	if (list_empty(&ei->i_orphan)) {
		unlock_super(inode->i_sb);
		return 0;
	}

	ino_next = NEXT_ORPHAN(inode);
	prev = ei->i_orphan.prev;
	sbi = EXT4_SB(inode->i_sb);

	jbd_debug(4, "remove inode %lu from orphan list\n", inode->i_ino);

	list_del_init(&ei->i_orphan);

	/* If we're on an error path, we may not have a valid
	 * transaction handle with which to update the orphan list on
	 * disk, but we still need to remove the inode from the linked
	 * list in memory. */
	if (sbi->s_journal && !handle)
		goto out;

	err = ext4_reserve_inode_write(handle, inode, &iloc);
	if (err)
		goto out_err;

	if (prev == &sbi->s_orphan) {
		jbd_debug(4, "superblock will point to %u\n", ino_next);
		BUFFER_TRACE(sbi->s_sbh, "get_write_access");
		err = ext4_journal_get_write_access(handle, sbi->s_sbh);
		if (err)
			goto out_brelse;
		sbi->s_es->s_last_orphan = cpu_to_le32(ino_next);
		err = ext4_handle_dirty_metadata(handle, inode, sbi->s_sbh);
	} else {
		struct ext4_iloc iloc2;
		struct inode *i_prev =
			&list_entry(prev, struct ext4_inode_info, i_orphan)->vfs_inode;

		jbd_debug(4, "orphan inode %lu will point to %u\n",
			  i_prev->i_ino, ino_next);
		err = ext4_reserve_inode_write(handle, i_prev, &iloc2);
		if (err)
			goto out_brelse;
		NEXT_ORPHAN(i_prev) = ino_next;
		err = ext4_mark_iloc_dirty(handle, i_prev, &iloc2);
	}
	if (err)
		goto out_brelse;
	NEXT_ORPHAN(inode) = 0;
	err = ext4_mark_iloc_dirty(handle, inode, &iloc);

out_err:
	ext4_std_error(inode->i_sb, err);
out:
	unlock_super(inode->i_sb);
	return err;

out_brelse:
	brelse(iloc.bh);
	goto out_err;
}

Project: linux-2.6

static struct buffer_head * ext4_find_entry (struct inode *dir,
					const struct qstr *d_name,
					struct ext4_dir_entry_2 ** res_dir)
{
	struct super_block *sb;
	struct buffer_head *bh_use[NAMEI_RA_SIZE];
	struct buffer_head *bh, *ret = NULL;
	ext4_lblk_t start, block, b;
	int ra_max = 0;		/* Number of bh's in the readahead
				   buffer, bh_use[] */
	int ra_ptr = 0;		/* Current index into readahead
				   buffer */
	int num = 0;
	ext4_lblk_t  nblocks;
	int i, err;
	int namelen;

	*res_dir = NULL;
	sb = dir->i_sb;
	namelen = d_name->len;
	if (namelen > EXT4_NAME_LEN)
		return NULL;
	if (is_dx(dir)) {
		bh = ext4_dx_find_entry(dir, d_name, res_dir, &err);
		/*
		 * On success, or if the error was file not found,
		 * return.  Otherwise, fall back to doing a search the
		 * old fashioned way.
		 */
		if (bh || (err != ERR_BAD_DX_DIR))
			return bh;
		dxtrace(printk(KERN_DEBUG "ext4_find_entry: dx failed, "
			       "falling back\n"));
	}
	nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb);
	start = EXT4_I(dir)->i_dir_start_lookup;
	if (start >= nblocks)
		start = 0;
	block = start;
restart:
	do {
		/*
		 * We deal with the read-ahead logic here.
		 */
		if (ra_ptr >= ra_max) {
			/* Refill the readahead buffer */
			ra_ptr = 0;
			b = block;
			for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
				/*
				 * Terminate if we reach the end of the
				 * directory and must wrap, or if our
				 * search has finished at this block.
				 */
				if (b >= nblocks || (num && block == start)) {
					bh_use[ra_max] = NULL;
					break;
				}
				num++;
				bh = ext4_getblk(NULL, dir, b++, 0, &err);
				bh_use[ra_max] = bh;
				if (bh)
					ll_rw_block(READ_META, 1, &bh);
			}
		}
		if ((bh = bh_use[ra_ptr++]) == NULL)
			goto next;
		wait_on_buffer(bh);
		if (!buffer_uptodate(bh)) {
			/* read error, skip block & hope for the best */
			ext4_error(sb, __func__, "reading directory #%lu "
				   "offset %lu", dir->i_ino,
				   (unsigned long)block);
			brelse(bh);
			goto next;
		}
		i = search_dirblock(bh, dir, d_name,
			    block << EXT4_BLOCK_SIZE_BITS(sb), res_dir);
		if (i == 1) {
			EXT4_I(dir)->i_dir_start_lookup = block;
			ret = bh;
			goto cleanup_and_exit;
		} else {
			brelse(bh);
			if (i < 0)
				goto cleanup_and_exit;
		}
	next:
		if (++block >= nblocks)
			block = 0;
	} while (block != start);

	/*
	 * If the directory has grown while we were searching, then
	 * search the last part of the directory before giving up.
	 */
	block = nblocks;
	nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb);
	if (block < nblocks) {
		start = 0;
		goto restart;
	}

cleanup_and_exit:
	/* Clean up the read-ahead blocks */
	for (; ra_ptr < ra_max; ra_ptr++)
		brelse(bh_use[ra_ptr]);
	return ret;
}

Project: linux-2.6

int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
			 __u32 start_minor_hash, __u32 *next_hash)
{
	struct dx_hash_info hinfo;
	struct ext4_dir_entry_2 *de;
	struct dx_frame frames[2], *frame;
	struct inode *dir;
	ext4_lblk_t block;
	int count = 0;
	int ret, err;
	__u32 hashval;

	dxtrace(printk(KERN_DEBUG "In htree_fill_tree, start hash: %x:%x\n", 
		       start_hash, start_minor_hash));
	dir = dir_file->f_path.dentry->d_inode;
	if (!(EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) {
		hinfo.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version;
		if (hinfo.hash_version <= DX_HASH_TEA)
			hinfo.hash_version +=
				EXT4_SB(dir->i_sb)->s_hash_unsigned;
		hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed;
		count = htree_dirblock_to_tree(dir_file, dir, 0, &hinfo,
					       start_hash, start_minor_hash);
		*next_hash = ~0;
		return count;
	}
	hinfo.hash = start_hash;
	hinfo.minor_hash = 0;
	frame = dx_probe(NULL, dir, &hinfo, frames, &err);
	if (!frame)
		return err;

	/* Add '.' and '..' from the htree header */
	if (!start_hash && !start_minor_hash) {
		de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data;
		if ((err = ext4_htree_store_dirent(dir_file, 0, 0, de)) != 0)
			goto errout;
		count++;
	}
	if (start_hash < 2 || (start_hash ==2 && start_minor_hash==0)) {
		de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data;
		de = ext4_next_entry(de);
		if ((err = ext4_htree_store_dirent(dir_file, 2, 0, de)) != 0)
			goto errout;
		count++;
	}

	while (1) {
		block = dx_get_block(frame->at);
		ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo,
					     start_hash, start_minor_hash);
		if (ret < 0) {
			err = ret;
			goto errout;
		}
		count += ret;
		hashval = ~0;
		ret = ext4_htree_next_block(dir, HASH_NB_ALWAYS,
					    frame, frames, &hashval);
		*next_hash = hashval;
		if (ret < 0) {
			err = ret;
			goto errout;
		}
		/*
		 * Stop if:  (a) there are no more entries, or
		 * (b) we have inserted at least one entry and the
		 * next hash value is not a continuation
		 */
		if ((ret == 0) ||
		    (count && ((hashval & 1) == 0)))
			break;
	}
	dx_release(frames);
	dxtrace(printk(KERN_DEBUG "Fill tree: returned %d entries, "
		       "next hash: %x\n", count, *next_hash));
	return count;
errout:
	dx_release(frames);
	return (err);
}

Project: linux-2.6

int ext4_orphan_add(handle_t *handle, struct inode *inode)
{
	struct super_block *sb = inode->i_sb;
	struct ext4_iloc iloc;
	int err = 0, rc;

	if (!ext4_handle_valid(handle))
		return 0;

	lock_super(sb);
	if (!list_empty(&EXT4_I(inode)->i_orphan))
		goto out_unlock;

	/* Orphan handling is only valid for files with data blocks
	 * being truncated, or files being unlinked. */

	/* @@@ FIXME: Observation from aviro:
	 * I think I can trigger J_ASSERT in ext4_orphan_add().  We block
	 * here (on lock_super()), so race with ext4_link() which might bump
	 * ->i_nlink. For, say it, character device. Not a regular file,
	 * not a directory, not a symlink and ->i_nlink > 0.
	 */
	J_ASSERT((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
		  S_ISLNK(inode->i_mode)) || inode->i_nlink == 0);

	BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access");
	err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh);
	if (err)
		goto out_unlock;

	err = ext4_reserve_inode_write(handle, inode, &iloc);
	if (err)
		goto out_unlock;

	/* Insert this inode at the head of the on-disk orphan list... */
	NEXT_ORPHAN(inode) = le32_to_cpu(EXT4_SB(sb)->s_es->s_last_orphan);
	EXT4_SB(sb)->s_es->s_last_orphan = cpu_to_le32(inode->i_ino);
	err = ext4_handle_dirty_metadata(handle, inode, EXT4_SB(sb)->s_sbh);
	rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
	if (!err)
		err = rc;

	/* Only add to the head of the in-memory list if all the
	 * previous operations succeeded.  If the orphan_add is going to
	 * fail (possibly taking the journal offline), we can't risk
	 * leaving the inode on the orphan list: stray orphan-list
	 * entries can cause panics at unmount time.
	 *
	 * This is safe: on error we're going to ignore the orphan list
	 * anyway on the next recovery. */
	if (!err)
		list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);

	jbd_debug(4, "superblock will point to %lu\n", inode->i_ino);
	jbd_debug(4, "orphan inode %lu will point to %d\n",
			inode->i_ino, NEXT_ORPHAN(inode));
out_unlock:
	unlock_super(sb);
	ext4_std_error(inode->i_sb, err);
	return err;
}

Project: linux-2.6

ext4_next_entry(struct ext4_dir_entry_2 *p)
{
	return (struct ext4_dir_entry_2 *)((char *)p +
		ext4_rec_len_from_disk(p->rec_len));
}

Project: linux-2.6

static int ext4_rmdir(struct inode *dir, struct dentry *dentry)
{
	int retval;
	struct inode *inode;
	struct buffer_head *bh;
	struct ext4_dir_entry_2 *de;
	handle_t *handle;

	/* Initialize quotas before so that eventual writes go in
	 * separate transaction */
	DQUOT_INIT(dentry->d_inode);
	handle = ext4_journal_start(dir, EXT4_DELETE_TRANS_BLOCKS(dir->i_sb));
	if (IS_ERR(handle))
		return PTR_ERR(handle);

	retval = -ENOENT;
	bh = ext4_find_entry(dir, &dentry->d_name, &de);
	if (!bh)
		goto end_rmdir;

	if (IS_DIRSYNC(dir))
		ext4_handle_sync(handle);

	inode = dentry->d_inode;

	retval = -EIO;
	if (le32_to_cpu(de->inode) != inode->i_ino)
		goto end_rmdir;

	retval = -ENOTEMPTY;
	if (!empty_dir(inode))
		goto end_rmdir;

	retval = ext4_delete_entry(handle, dir, de, bh);
	if (retval)
		goto end_rmdir;
	if (!EXT4_DIR_LINK_EMPTY(inode))
		ext4_warning(inode->i_sb, "ext4_rmdir",
			     "empty directory has too many links (%d)",
			     inode->i_nlink);
	inode->i_version++;
	clear_nlink(inode);
	/* There's no need to set i_disksize: the fact that i_nlink is
	 * zero will ensure that the right thing happens during any
	 * recovery. */
	inode->i_size = 0;
	ext4_orphan_add(handle, inode);
	inode->i_ctime = dir->i_ctime = dir->i_mtime = ext4_current_time(inode);
	ext4_mark_inode_dirty(handle, inode);
	ext4_dec_count(handle, dir);
	ext4_update_dx_flag(dir);
	ext4_mark_inode_dirty(handle, dir);

end_rmdir:
	ext4_journal_stop(handle);
	brelse(bh);
	return retval;
}

Project: linux-2.6

static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
			  struct inode *inode)
{
	struct inode *dir = dentry->d_parent->d_inode;
	struct buffer_head *bh;
	struct ext4_dir_entry_2 *de;
	struct super_block *sb;
	int	retval;
	int	dx_fallback=0;
	unsigned blocksize;
	ext4_lblk_t block, blocks;

	sb = dir->i_sb;
	blocksize = sb->s_blocksize;
	if (!dentry->d_name.len)
		return -EINVAL;
	if (is_dx(dir)) {
		retval = ext4_dx_add_entry(handle, dentry, inode);
		if (!retval || (retval != ERR_BAD_DX_DIR))
			return retval;
		EXT4_I(dir)->i_flags &= ~EXT4_INDEX_FL;
		dx_fallback++;
		ext4_mark_inode_dirty(handle, dir);
	}
	blocks = dir->i_size >> sb->s_blocksize_bits;
	for (block = 0; block < blocks; block++) {
		bh = ext4_bread(handle, dir, block, 0, &retval);
		if(!bh)
			return retval;
		retval = add_dirent_to_buf(handle, dentry, inode, NULL, bh);
		if (retval != -ENOSPC)
			return retval;

		if (blocks == 1 && !dx_fallback &&
		    EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX))
			return make_indexed_dir(handle, dentry, inode, bh);
		brelse(bh);
	}
	bh = ext4_append(handle, dir, &block, &retval);
	if (!bh)
		return retval;
	de = (struct ext4_dir_entry_2 *) bh->b_data;
	de->inode = 0;
	de->rec_len = ext4_rec_len_to_disk(blocksize);
	return add_dirent_to_buf(handle, dentry, inode, de, bh);
}

Project: linux-2.6

static int dx_make_map (struct ext4_dir_entry_2 *de, int size,
			struct dx_hash_info *hinfo, struct dx_map_entry *map_tail)
{
	int count = 0;
	char *base = (char *) de;
	struct dx_hash_info h = *hinfo;

	while ((char *) de < base + size)
	{
		if (de->name_len && de->inode) {
			ext4fs_dirhash(de->name, de->name_len, &h);
			map_tail--;
			map_tail->hash = h.hash;
			map_tail->offs = (u16) ((char *) de - base);
			map_tail->size = le16_to_cpu(de->rec_len);
			count++;
			cond_resched();
		}
		/* XXX: do we need to check rec_len == 0 case? -Chris */
		de = ext4_next_entry(de);
	}
	return count;
}

Project: linux-2.6

static int ext4_create(struct inode *dir, struct dentry *dentry, int mode,
		       struct nameidata *nd)
{
	handle_t *handle;
	struct inode *inode;
	int err, retries = 0;

retry:
	handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
					EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
					2*EXT4_QUOTA_INIT_BLOCKS(dir->i_sb));
	if (IS_ERR(handle))
		return PTR_ERR(handle);

	if (IS_DIRSYNC(dir))
		ext4_handle_sync(handle);

	inode = ext4_new_inode (handle, dir, mode);
	err = PTR_ERR(inode);
	if (!IS_ERR(inode)) {
		inode->i_op = &ext4_file_inode_operations;
		inode->i_fop = &ext4_file_operations;
		ext4_set_aops(inode);
		err = ext4_add_nondir(handle, dentry, inode);
	}
	ext4_journal_stop(handle);
	if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
		goto retry;
	return err;
}

Project: linux-2.6

static struct buffer_head *ext4_append(handle_t *handle,
					struct inode *inode,
					ext4_lblk_t *block, int *err)
{
	struct buffer_head *bh;

	*block = inode->i_size >> inode->i_sb->s_blocksize_bits;

	bh = ext4_bread(handle, inode, *block, 1, err);
	if (bh) {
		inode->i_size += inode->i_sb->s_blocksize;
		EXT4_I(inode)->i_disksize = inode->i_size;
		*err = ext4_journal_get_write_access(handle, bh);
		if (*err) {
			brelse(bh);
			bh = NULL;
		}
	}
	return bh;
}

Project: linux-2.6

static void ext4_inc_count(handle_t *handle, struct inode *inode)
{
	inc_nlink(inode);
	if (is_dx(inode) && inode->i_nlink > 1) {
		/* limit is 16-bit i_links_count */
		if (inode->i_nlink >= EXT4_LINK_MAX || inode->i_nlink == 2) {
			inode->i_nlink = 1;
			EXT4_SET_RO_COMPAT_FEATURE(inode->i_sb,
					      EXT4_FEATURE_RO_COMPAT_DIR_NLINK);
		}
	}
}

Project: linux-2.6

static inline unsigned dx_root_limit(struct inode *dir, unsigned infosize)
{
	unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(1) -
		EXT4_DIR_REC_LEN(2) - infosize;
	return entry_space / sizeof(struct dx_entry);
}

Project: linux-2.6

static int empty_dir(struct inode *inode)
{
	unsigned int offset;
	struct buffer_head *bh;
	struct ext4_dir_entry_2 *de, *de1;
	struct super_block *sb;
	int err = 0;

	sb = inode->i_sb;
	if (inode->i_size < EXT4_DIR_REC_LEN(1) + EXT4_DIR_REC_LEN(2) ||
	    !(bh = ext4_bread(NULL, inode, 0, 0, &err))) {
		if (err)
			ext4_error(inode->i_sb, __func__,
				   "error %d reading directory #%lu offset 0",
				   err, inode->i_ino);
		else
			ext4_warning(inode->i_sb, __func__,
				     "bad directory (dir #%lu) - no data block",
				     inode->i_ino);
		return 1;
	}
	de = (struct ext4_dir_entry_2 *) bh->b_data;
	de1 = ext4_next_entry(de);
	if (le32_to_cpu(de->inode) != inode->i_ino ||
			!le32_to_cpu(de1->inode) ||
			strcmp(".", de->name) ||
			strcmp("..", de1->name)) {
		ext4_warning(inode->i_sb, "empty_dir",
			     "bad directory (dir #%lu) - no `.' or `..'",
			     inode->i_ino);
		brelse(bh);
		return 1;
	}
	offset = ext4_rec_len_from_disk(de->rec_len) +
		 ext4_rec_len_from_disk(de1->rec_len);
	de = ext4_next_entry(de1);
	while (offset < inode->i_size) {
		if (!bh ||
			(void *) de >= (void *) (bh->b_data+sb->s_blocksize)) {
			err = 0;
			brelse(bh);
			bh = ext4_bread(NULL, inode,
				offset >> EXT4_BLOCK_SIZE_BITS(sb), 0, &err);
			if (!bh) {
				if (err)
					ext4_error(sb, __func__,
						   "error %d reading directory"
						   " #%lu offset %u",
						   err, inode->i_ino, offset);
				offset += sb->s_blocksize;
				continue;
			}
			de = (struct ext4_dir_entry_2 *) bh->b_data;
		}
		if (!ext4_check_dir_entry("empty_dir", inode, de, bh, offset)) {
			de = (struct ext4_dir_entry_2 *)(bh->b_data +
							 sb->s_blocksize);
			offset = (offset | (sb->s_blocksize - 1)) + 1;
			continue;
		}
		if (le32_to_cpu(de->inode)) {
			brelse(bh);
			return 0;
		}
		offset += ext4_rec_len_from_disk(de->rec_len);
		de = ext4_next_entry(de);
	}
	brelse(bh);
	return 1;
}

Project: linux-2.6

static void ext4_dec_count(handle_t *handle, struct inode *inode)
{
	drop_nlink(inode);
	if (S_ISDIR(inode->i_mode) && inode->i_nlink == 0)
		inc_nlink(inode);
}

Project: linux-2.6

static int ext4_mknod(struct inode *dir, struct dentry *dentry,
		      int mode, dev_t rdev)
{
	handle_t *handle;
	struct inode *inode;
	int err, retries = 0;

	if (!new_valid_dev(rdev))
		return -EINVAL;

retry:
	handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
					EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
					2*EXT4_QUOTA_INIT_BLOCKS(dir->i_sb));
	if (IS_ERR(handle))
		return PTR_ERR(handle);

	if (IS_DIRSYNC(dir))
		ext4_handle_sync(handle);

	inode = ext4_new_inode(handle, dir, mode);
	err = PTR_ERR(inode);
	if (!IS_ERR(inode)) {
		init_special_inode(inode, inode->i_mode, rdev);
#ifdef CONFIG_EXT4_FS_XATTR
		inode->i_op = &ext4_special_inode_operations;
#endif
		err = ext4_add_nondir(handle, dentry, inode);
	}
	ext4_journal_stop(handle);
	if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
		goto retry;
	return err;
}

Project: linux-2.6

static int make_indexed_dir(handle_t *handle, struct dentry *dentry,
			    struct inode *inode, struct buffer_head *bh)
{
	struct inode	*dir = dentry->d_parent->d_inode;
	const char	*name = dentry->d_name.name;
	int		namelen = dentry->d_name.len;
	struct buffer_head *bh2;
	struct dx_root	*root;
	struct dx_frame	frames[2], *frame;
	struct dx_entry *entries;
	struct ext4_dir_entry_2	*de, *de2;
	char		*data1, *top;
	unsigned	len;
	int		retval;
	unsigned	blocksize;
	struct dx_hash_info hinfo;
	ext4_lblk_t  block;
	struct fake_dirent *fde;

	blocksize =  dir->i_sb->s_blocksize;
	dxtrace(printk(KERN_DEBUG "Creating index: inode %lu\n", dir->i_ino));
	retval = ext4_journal_get_write_access(handle, bh);
	if (retval) {
		ext4_std_error(dir->i_sb, retval);
		brelse(bh);
		return retval;
	}
	root = (struct dx_root *) bh->b_data;

	/* The 0th block becomes the root, move the dirents out */
	fde = &root->dotdot;
	de = (struct ext4_dir_entry_2 *)((char *)fde +
		ext4_rec_len_from_disk(fde->rec_len));
	if ((char *) de >= (((char *) root) + blocksize)) {
		ext4_error(dir->i_sb, __func__,
			   "invalid rec_len for '..' in inode %lu",
			   dir->i_ino);
		brelse(bh);
		return -EIO;
	}
	len = ((char *) root) + blocksize - (char *) de;

	/* Allocate new block for the 0th block's dirents */
	bh2 = ext4_append(handle, dir, &block, &retval);
	if (!(bh2)) {
		brelse(bh);
		return retval;
	}
	EXT4_I(dir)->i_flags |= EXT4_INDEX_FL;
	data1 = bh2->b_data;

	memcpy (data1, de, len);
	de = (struct ext4_dir_entry_2 *) data1;
	top = data1 + len;
	while ((char *)(de2 = ext4_next_entry(de)) < top)
		de = de2;
	de->rec_len = ext4_rec_len_to_disk(data1 + blocksize - (char *) de);
	/* Initialize the root; the dot dirents already exist */
	de = (struct ext4_dir_entry_2 *) (&root->dotdot);
	de->rec_len = ext4_rec_len_to_disk(blocksize - EXT4_DIR_REC_LEN(2));
	memset (&root->info, 0, sizeof(root->info));
	root->info.info_length = sizeof(root->info);
	root->info.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version;
	entries = root->entries;
	dx_set_block(entries, 1);
	dx_set_count(entries, 1);
	dx_set_limit(entries, dx_root_limit(dir, sizeof(root->info)));

	/* Initialize as for dx_probe */
	hinfo.hash_version = root->info.hash_version;
	if (hinfo.hash_version <= DX_HASH_TEA)
		hinfo.hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned;
	hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed;
	ext4fs_dirhash(name, namelen, &hinfo);
	frame = frames;
	frame->entries = entries;
	frame->at = entries;
	frame->bh = bh;
	bh = bh2;
	de = do_split(handle,dir, &bh, frame, &hinfo, &retval);
	dx_release (frames);
	if (!(de))
		return retval;

	return add_dirent_to_buf(handle, dentry, inode, de, bh);
}

Project: linux-2.6

static int ext4_htree_next_block(struct inode *dir, __u32 hash,
				 struct dx_frame *frame,
				 struct dx_frame *frames,
				 __u32 *start_hash)
{
	struct dx_frame *p;
	struct buffer_head *bh;
	int err, num_frames = 0;
	__u32 bhash;

	p = frame;
	/*
	 * Find the next leaf page by incrementing the frame pointer.
	 * If we run out of entries in the interior node, loop around and
	 * increment pointer in the parent node.  When we break out of
	 * this loop, num_frames indicates the number of interior
	 * nodes need to be read.
	 */
	while (1) {
		if (++(p->at) < p->entries + dx_get_count(p->entries))
			break;
		if (p == frames)
			return 0;
		num_frames++;
		p--;
	}

	/*
	 * If the hash is 1, then continue only if the next page has a
	 * continuation hash of any value.  This is used for readdir
	 * handling.  Otherwise, check to see if the hash matches the
	 * desired contiuation hash.  If it doesn't, return since
	 * there's no point to read in the successive index pages.
	 */
	bhash = dx_get_hash(p->at);
	if (start_hash)
		*start_hash = bhash;
	if ((hash & 1) == 0) {
		if ((bhash & ~1) != hash)
			return 0;
	}
	/*
	 * If the hash is HASH_NB_ALWAYS, we always go to the next
	 * block so no check is necessary
	 */
	while (num_frames--) {
		if (!(bh = ext4_bread(NULL, dir, dx_get_block(p->at),
				      0, &err)))
			return err; /* Failure */
		p++;
		brelse(p->bh);
		p->bh = bh;
		p->at = p->entries = ((struct dx_node *) bh->b_data)->entries;
	}
	return 1;
}

Project: linux-2.6

static struct buffer_head * ext4_dx_find_entry(struct inode *dir, const struct qstr *d_name,
		       struct ext4_dir_entry_2 **res_dir, int *err)
{
	struct super_block * sb;
	struct dx_hash_info	hinfo;
	u32 hash;
	struct dx_frame frames[2], *frame;
	struct ext4_dir_entry_2 *de, *top;
	struct buffer_head *bh;
	ext4_lblk_t block;
	int retval;
	int namelen = d_name->len;
	const u8 *name = d_name->name;

	sb = dir->i_sb;
	/* NFS may look up ".." - look at dx_root directory block */
	if (namelen > 2 || name[0] != '.'||(name[1] != '.' && name[1] != '\0')){
		if (!(frame = dx_probe(d_name, dir, &hinfo, frames, err)))
			return NULL;
	} else {
		frame = frames;
		frame->bh = NULL;			/* for dx_release() */
		frame->at = (struct dx_entry *)frames;	/* hack for zero entry*/
		dx_set_block(frame->at, 0);		/* dx_root block is 0 */
	}
	hash = hinfo.hash;
	do {
		block = dx_get_block(frame->at);
		if (!(bh = ext4_bread (NULL,dir, block, 0, err)))
			goto errout;
		de = (struct ext4_dir_entry_2 *) bh->b_data;
		top = (struct ext4_dir_entry_2 *) ((char *) de + sb->s_blocksize -
				       EXT4_DIR_REC_LEN(0));
		for (; de < top; de = ext4_next_entry(de)) {
			int off = (block << EXT4_BLOCK_SIZE_BITS(sb))
				  + ((char *) de - bh->b_data);

			if (!ext4_check_dir_entry(__func__, dir, de, bh, off)) {
				brelse(bh);
				*err = ERR_BAD_DX_DIR;
				goto errout;
			}

			if (ext4_match(namelen, name, de)) {
				*res_dir = de;
				dx_release(frames);
				return bh;
			}
		}
		brelse(bh);
		/* Check to see if we should continue to search */
		retval = ext4_htree_next_block(dir, hash, frame,
					       frames, NULL);
		if (retval < 0) {
			ext4_warning(sb, __func__,
			     "error reading index page in directory #%lu",
			     dir->i_ino);
			*err = retval;
			goto errout;
		}
	} while (retval == 1);

	*err = -ENOENT;
errout:
	dxtrace(printk(KERN_DEBUG "%s not found\n", name));
	dx_release (frames);
	return NULL;
}

Project: linux-2.6

static int ext4_unlink(struct inode *dir, struct dentry *dentry)
{
	int retval;
	struct inode *inode;
	struct buffer_head *bh;
	struct ext4_dir_entry_2 *de;
	handle_t *handle;

	/* Initialize quotas before so that eventual writes go
	 * in separate transaction */
	DQUOT_INIT(dentry->d_inode);
	handle = ext4_journal_start(dir, EXT4_DELETE_TRANS_BLOCKS(dir->i_sb));
	if (IS_ERR(handle))
		return PTR_ERR(handle);

	if (IS_DIRSYNC(dir))
		ext4_handle_sync(handle);

	retval = -ENOENT;
	bh = ext4_find_entry(dir, &dentry->d_name, &de);
	if (!bh)
		goto end_unlink;

	inode = dentry->d_inode;

	retval = -EIO;
	if (le32_to_cpu(de->inode) != inode->i_ino)
		goto end_unlink;

	if (!inode->i_nlink) {
		ext4_warning(inode->i_sb, "ext4_unlink",
			     "Deleting nonexistent file (%lu), %d",
			     inode->i_ino, inode->i_nlink);
		inode->i_nlink = 1;
	}
	retval = ext4_delete_entry(handle, dir, de, bh);
	if (retval)
		goto end_unlink;
	dir->i_ctime = dir->i_mtime = ext4_current_time(dir);
	ext4_update_dx_flag(dir);
	ext4_mark_inode_dirty(handle, dir);
	drop_nlink(inode);
	if (!inode->i_nlink)
		ext4_orphan_add(handle, inode);
	inode->i_ctime = ext4_current_time(inode);
	ext4_mark_inode_dirty(handle, inode);
	retval = 0;

end_unlink:
	ext4_journal_stop(handle);
	brelse(bh);
	return retval;
}

Project: linux-2.6

static void ext4_update_dx_flag(struct inode *inode)
{
	if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb,
				     EXT4_FEATURE_COMPAT_DIR_INDEX))
		EXT4_I(inode)->i_flags &= ~EXT4_INDEX_FL;
}

Project: linux-2.6

static struct stats dx_show_leaf(struct dx_hash_info *hinfo, struct ext4_dir_entry_2 *de,
				 int size, int show_names)
{
	unsigned names = 0, space = 0;
	char *base = (char *) de;
	struct dx_hash_info h = *hinfo;

	printk("names: ");
	while ((char *) de < base + size)
	{
		if (de->inode)
		{
			if (show_names)
			{
				int len = de->name_len;
				char *name = de->name;
				while (len--) printk("%c", *name++);
				ext4fs_dirhash(de->name, de->name_len, &h);
				printk(":%x.%u ", h.hash,
				       ((char *) de - base));
			}
			space += EXT4_DIR_REC_LEN(de->name_len);
			names++;
		}
		de = ext4_next_entry(de);
	}
	printk("(%i)\n", names);
	return (struct stats) { names, space, 1 };
}

Project: linux-2.6

static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
{
	struct inode *inode;
	struct ext4_dir_entry_2 *de;
	struct buffer_head *bh;

	if (dentry->d_name.len > EXT4_NAME_LEN)
		return ERR_PTR(-ENAMETOOLONG);

	bh = ext4_find_entry(dir, &dentry->d_name, &de);
	inode = NULL;
	if (bh) {
		__u32 ino = le32_to_cpu(de->inode);
		brelse(bh);
		if (!ext4_valid_inum(dir->i_sb, ino)) {
			ext4_error(dir->i_sb, "ext4_lookup",
				   "bad inode number: %u", ino);
			return ERR_PTR(-EIO);
		}
		inode = ext4_iget(dir->i_sb, ino);
		if (IS_ERR(inode))
			return ERR_CAST(inode);
	}
	return d_splice_alias(inode, dentry);
}

Project: linux-2.6

static inline int search_dirblock(struct buffer_head *bh,
				  struct inode *dir,
				  const struct qstr *d_name,
				  unsigned int offset,
				  struct ext4_dir_entry_2 ** res_dir)
{
	struct ext4_dir_entry_2 * de;
	char * dlimit;
	int de_len;
	const char *name = d_name->name;
	int namelen = d_name->len;

	de = (struct ext4_dir_entry_2 *) bh->b_data;
	dlimit = bh->b_data + dir->i_sb->s_blocksize;
	while ((char *) de < dlimit) {
		/* this code is executed quadratically often */
		/* do minimal checking `by hand' */

		if ((char *) de + namelen <= dlimit &&
		    ext4_match (namelen, name, de)) {
			/* found a match - just to be sure, do a full check */
			if (!ext4_check_dir_entry("ext4_find_entry",
						  dir, de, bh, offset))
				return -1;
			*res_dir = de;
			return 1;
		}
		/* prevent looping on a bad block */
		de_len = ext4_rec_len_from_disk(de->rec_len);
		if (de_len <= 0)
			return -1;
		offset += de_len;
		de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
	}
	return 0;
}

Project: linux-2.6

static inline unsigned dx_node_limit(struct inode *dir)
{
	unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(0);
	return entry_space / sizeof(struct dx_entry);
}

Project: linux-2.6

static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
		       struct inode *new_dir, struct dentry *new_dentry)
{
	handle_t *handle;
	struct inode *old_inode, *new_inode;
	struct buffer_head *old_bh, *new_bh, *dir_bh;
	struct ext4_dir_entry_2 *old_de, *new_de;
	int retval;

	old_bh = new_bh = dir_bh = NULL;

	/* Initialize quotas before so that eventual writes go
	 * in separate transaction */
	if (new_dentry->d_inode)
		DQUOT_INIT(new_dentry->d_inode);
	handle = ext4_journal_start(old_dir, 2 *
					EXT4_DATA_TRANS_BLOCKS(old_dir->i_sb) +
					EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2);
	if (IS_ERR(handle))
		return PTR_ERR(handle);

	if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
		ext4_handle_sync(handle);

	old_bh = ext4_find_entry(old_dir, &old_dentry->d_name, &old_de);
	/*
	 *  Check for inode number is _not_ due to possible IO errors.
	 *  We might rmdir the source, keep it as pwd of some process
	 *  and merrily kill the link to whatever was created under the
	 *  same name. Goodbye sticky bit ;-<
	 */
	old_inode = old_dentry->d_inode;
	retval = -ENOENT;
	if (!old_bh || le32_to_cpu(old_de->inode) != old_inode->i_ino)
		goto end_rename;

	new_inode = new_dentry->d_inode;
	new_bh = ext4_find_entry(new_dir, &new_dentry->d_name, &new_de);
	if (new_bh) {
		if (!new_inode) {
			brelse(new_bh);
			new_bh = NULL;
		}
	}
	if (S_ISDIR(old_inode->i_mode)) {
		if (new_inode) {
			retval = -ENOTEMPTY;
			if (!empty_dir(new_inode))
				goto end_rename;
		}
		retval = -EIO;
		dir_bh = ext4_bread(handle, old_inode, 0, 0, &retval);
		if (!dir_bh)
			goto end_rename;
		if (le32_to_cpu(PARENT_INO(dir_bh->b_data)) != old_dir->i_ino)
			goto end_rename;
		retval = -EMLINK;
		if (!new_inode && new_dir != old_dir &&
				new_dir->i_nlink >= EXT4_LINK_MAX)
			goto end_rename;
	}
	if (!new_bh) {
		retval = ext4_add_entry(handle, new_dentry, old_inode);
		if (retval)
			goto end_rename;
	} else {
		BUFFER_TRACE(new_bh, "get write access");
		ext4_journal_get_write_access(handle, new_bh);
		new_de->inode = cpu_to_le32(old_inode->i_ino);
		if (EXT4_HAS_INCOMPAT_FEATURE(new_dir->i_sb,
					      EXT4_FEATURE_INCOMPAT_FILETYPE))
			new_de->file_type = old_de->file_type;
		new_dir->i_version++;
		new_dir->i_ctime = new_dir->i_mtime =
					ext4_current_time(new_dir);
		ext4_mark_inode_dirty(handle, new_dir);
		BUFFER_TRACE(new_bh, "call ext4_handle_dirty_metadata");
		ext4_handle_dirty_metadata(handle, new_dir, new_bh);
		brelse(new_bh);
		new_bh = NULL;
	}

	/*
	 * Like most other Unix systems, set the ctime for inodes on a
	 * rename.
	 */
	old_inode->i_ctime = ext4_current_time(old_inode);
	ext4_mark_inode_dirty(handle, old_inode);

	/*
	 * ok, that's it
	 */
	if (le32_to_cpu(old_de->inode) != old_inode->i_ino ||
	    old_de->name_len != old_dentry->d_name.len ||
	    strncmp(old_de->name, old_dentry->d_name.name, old_de->name_len) ||
	    (retval = ext4_delete_entry(handle, old_dir,
					old_de, old_bh)) == -ENOENT) {
		/* old_de could have moved from under us during htree split, so
		 * make sure that we are deleting the right entry.  We might
		 * also be pointing to a stale entry in the unused part of
		 * old_bh so just checking inum and the name isn't enough. */
		struct buffer_head *old_bh2;
		struct ext4_dir_entry_2 *old_de2;

		old_bh2 = ext4_find_entry(old_dir, &old_dentry->d_name, &old_de2);
		if (old_bh2) {
			retval = ext4_delete_entry(handle, old_dir,
						   old_de2, old_bh2);
			brelse(old_bh2);
		}
	}
	if (retval) {
		ext4_warning(old_dir->i_sb, "ext4_rename",
				"Deleting old file (%lu), %d, error=%d",
				old_dir->i_ino, old_dir->i_nlink, retval);
	}

	if (new_inode) {
		ext4_dec_count(handle, new_inode);
		new_inode->i_ctime = ext4_current_time(new_inode);
	}
	old_dir->i_ctime = old_dir->i_mtime = ext4_current_time(old_dir);
	ext4_update_dx_flag(old_dir);
	if (dir_bh) {
		BUFFER_TRACE(dir_bh, "get_write_access");
		ext4_journal_get_write_access(handle, dir_bh);
		PARENT_INO(dir_bh->b_data) = cpu_to_le32(new_dir->i_ino);
		BUFFER_TRACE(dir_bh, "call ext4_handle_dirty_metadata");
		ext4_handle_dirty_metadata(handle, old_dir, dir_bh);
		ext4_dec_count(handle, old_dir);
		if (new_inode) {
			/* checked empty_dir above, can't have another parent,
			 * ext4_dec_count() won't work for many-linked dirs */
			new_inode->i_nlink = 0;
		} else {
			ext4_inc_count(handle, new_dir);
			ext4_update_dx_flag(new_dir);
			ext4_mark_inode_dirty(handle, new_dir);
		}
	}
	ext4_mark_inode_dirty(handle, old_dir);
	if (new_inode) {
		ext4_mark_inode_dirty(handle, new_inode);
		if (!new_inode->i_nlink)
			ext4_orphan_add(handle, new_inode);
	}
	retval = 0;

end_rename:
	brelse(dir_bh);
	brelse(old_bh);
	brelse(new_bh);
	ext4_journal_stop(handle);
	return retval;
}

Project: linux-2.6

static int ext4_link(struct dentry *old_dentry,
		     struct inode *dir, struct dentry *dentry)
{
	handle_t *handle;
	struct inode *inode = old_dentry->d_inode;
	int err, retries = 0;

	if (EXT4_DIR_LINK_MAX(inode))
		return -EMLINK;

	/*
	 * Return -ENOENT if we've raced with unlink and i_nlink is 0.  Doing
	 * otherwise has the potential to corrupt the orphan inode list.
	 */
	if (inode->i_nlink == 0)
		return -ENOENT;

retry:
	handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
					EXT4_INDEX_EXTRA_TRANS_BLOCKS);
	if (IS_ERR(handle))
		return PTR_ERR(handle);

	if (IS_DIRSYNC(dir))
		ext4_handle_sync(handle);

	inode->i_ctime = ext4_current_time(inode);
	ext4_inc_count(handle, inode);
	atomic_inc(&inode->i_count);

	err = ext4_add_entry(handle, dentry, inode);
	if (!err) {
		ext4_mark_inode_dirty(handle, inode);
		d_instantiate(dentry, inode);
	} else {
		drop_nlink(inode);
		iput(inode);
	}
	ext4_journal_stop(handle);
	if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
		goto retry;
	return err;
}

Project: linux-2.6

static int ext4_symlink(struct inode *dir,
			struct dentry *dentry, const char *symname)
{
	handle_t *handle;
	struct inode *inode;
	int l, err, retries = 0;

	l = strlen(symname)+1;
	if (l > dir->i_sb->s_blocksize)
		return -ENAMETOOLONG;

retry:
	handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
					EXT4_INDEX_EXTRA_TRANS_BLOCKS + 5 +
					2*EXT4_QUOTA_INIT_BLOCKS(dir->i_sb));
	if (IS_ERR(handle))
		return PTR_ERR(handle);

	if (IS_DIRSYNC(dir))
		ext4_handle_sync(handle);

	inode = ext4_new_inode(handle, dir, S_IFLNK|S_IRWXUGO);
	err = PTR_ERR(inode);
	if (IS_ERR(inode))
		goto out_stop;

	if (l > sizeof(EXT4_I(inode)->i_data)) {
		inode->i_op = &ext4_symlink_inode_operations;
		ext4_set_aops(inode);
		/*
		 * page_symlink() calls into ext4_prepare/commit_write.
		 * We have a transaction open.  All is sweetness.  It also sets
		 * i_size in generic_commit_write().
		 */
		err = __page_symlink(inode, symname, l, 1);
		if (err) {
			clear_nlink(inode);
			unlock_new_inode(inode);
			ext4_mark_inode_dirty(handle, inode);
			iput(inode);
			goto out_stop;
		}
	} else {
		/* clear the extent format for fast symlink */
		EXT4_I(inode)->i_flags &= ~EXT4_EXTENTS_FL;
		inode->i_op = &ext4_fast_symlink_inode_operations;
		memcpy((char *)&EXT4_I(inode)->i_data, symname, l);
		inode->i_size = l-1;
	}
	EXT4_I(inode)->i_disksize = inode->i_size;
	err = ext4_add_nondir(handle, dentry, inode);
out_stop:
	ext4_journal_stop(handle);
	if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
		goto retry;
	return err;
}

Project: linux-2.6

dx_probe(const struct qstr *d_name, struct inode *dir,
	 struct dx_hash_info *hinfo, struct dx_frame *frame_in, int *err)
{
	unsigned count, indirect;
	struct dx_entry *at, *entries, *p, *q, *m;
	struct dx_root *root;
	struct buffer_head *bh;
	struct dx_frame *frame = frame_in;
	u32 hash;

	frame->bh = NULL;
	if (!(bh = ext4_bread (NULL,dir, 0, 0, err)))
		goto fail;
	root = (struct dx_root *) bh->b_data;
	if (root->info.hash_version != DX_HASH_TEA &&
	    root->info.hash_version != DX_HASH_HALF_MD4 &&
	    root->info.hash_version != DX_HASH_LEGACY) {
		ext4_warning(dir->i_sb, __func__,
			     "Unrecognised inode hash code %d",
			     root->info.hash_version);
		brelse(bh);
		*err = ERR_BAD_DX_DIR;
		goto fail;
	}
	hinfo->hash_version = root->info.hash_version;
	if (hinfo->hash_version <= DX_HASH_TEA)
		hinfo->hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned;
	hinfo->seed = EXT4_SB(dir->i_sb)->s_hash_seed;
	if (d_name)
		ext4fs_dirhash(d_name->name, d_name->len, hinfo);
	hash = hinfo->hash;

	if (root->info.unused_flags & 1) {
		ext4_warning(dir->i_sb, __func__,
			     "Unimplemented inode hash flags: %#06x",
			     root->info.unused_flags);
		brelse(bh);
		*err = ERR_BAD_DX_DIR;
		goto fail;
	}

	if ((indirect = root->info.indirect_levels) > 1) {
		ext4_warning(dir->i_sb, __func__,
			     "Unimplemented inode hash depth: %#06x",
			     root->info.indirect_levels);
		brelse(bh);
		*err = ERR_BAD_DX_DIR;
		goto fail;
	}

	entries = (struct dx_entry *) (((char *)&root->info) +
				       root->info.info_length);

	if (dx_get_limit(entries) != dx_root_limit(dir,
						   root->info.info_length)) {
		ext4_warning(dir->i_sb, __func__,
			     "dx entry: limit != root limit");
		brelse(bh);
		*err = ERR_BAD_DX_DIR;
		goto fail;
	}

	dxtrace(printk("Look up %x", hash));
	while (1)
	{
		count = dx_get_count(entries);
		if (!count || count > dx_get_limit(entries)) {
			ext4_warning(dir->i_sb, __func__,
				     "dx entry: no count or count > limit");
			brelse(bh);
			*err = ERR_BAD_DX_DIR;
			goto fail2;
		}

		p = entries + 1;
		q = entries + count - 1;
		while (p <= q)
		{
			m = p + (q - p)/2;
			dxtrace(printk("."));
			if (dx_get_hash(m) > hash)
				q = m - 1;
			else
				p = m + 1;
		}

		if (0) // linear search cross check
		{
			unsigned n = count - 1;
			at = entries;
			while (n--)
			{
				dxtrace(printk(","));
				if (dx_get_hash(++at) > hash)
				{
					at--;
					break;
				}
			}
			assert (at == p - 1);
		}

		at = p - 1;
		dxtrace(printk(" %x->%u\n", at == entries? 0: dx_get_hash(at), dx_get_block(at)));
		frame->bh = bh;
		frame->entries = entries;
		frame->at = at;
		if (!indirect--) return frame;
		if (!(bh = ext4_bread (NULL,dir, dx_get_block(at), 0, err)))
			goto fail2;
		at = entries = ((struct dx_node *) bh->b_data)->entries;
		if (dx_get_limit(entries) != dx_node_limit (dir)) {
			ext4_warning(dir->i_sb, __func__,
				     "dx entry: limit != node limit");
			brelse(bh);
			*err = ERR_BAD_DX_DIR;
			goto fail2;
		}
		frame++;
		frame->bh = NULL;
	}
fail2:
	while (frame >= frame_in) {
		brelse(frame->bh);
		frame--;
	}
fail:
	if (*err == ERR_BAD_DX_DIR)
		ext4_warning(dir->i_sb, __func__,
			     "Corrupt dir inode %ld, running e2fsck is "
			     "recommended.", dir->i_ino);
	return NULL;
}

Project: linux-2.6

static int ext4_add_nondir(handle_t *handle,
		struct dentry *dentry, struct inode *inode)
{
	int err = ext4_add_entry(handle, dentry, inode);
	if (!err) {
		ext4_mark_inode_dirty(handle, inode);
		d_instantiate(dentry, inode);
		unlock_new_inode(inode);
		return 0;
	}
	drop_nlink(inode);
	unlock_new_inode(inode);
	iput(inode);
	return err;
}

Project: linux-2.6

static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
			     struct inode *inode)
{
	struct dx_frame frames[2], *frame;
	struct dx_entry *entries, *at;
	struct dx_hash_info hinfo;
	struct buffer_head *bh;
	struct inode *dir = dentry->d_parent->d_inode;
	struct super_block *sb = dir->i_sb;
	struct ext4_dir_entry_2 *de;
	int err;

	frame = dx_probe(&dentry->d_name, dir, &hinfo, frames, &err);
	if (!frame)
		return err;
	entries = frame->entries;
	at = frame->at;

	if (!(bh = ext4_bread(handle,dir, dx_get_block(frame->at), 0, &err)))
		goto cleanup;

	BUFFER_TRACE(bh, "get_write_access");
	err = ext4_journal_get_write_access(handle, bh);
	if (err)
		goto journal_error;

	err = add_dirent_to_buf(handle, dentry, inode, NULL, bh);
	if (err != -ENOSPC) {
		bh = NULL;
		goto cleanup;
	}

	/* Block full, should compress but for now just split */
	dxtrace(printk(KERN_DEBUG "using %u of %u node entries\n",
		       dx_get_count(entries), dx_get_limit(entries)));
	/* Need to split index? */
	if (dx_get_count(entries) == dx_get_limit(entries)) {
		ext4_lblk_t newblock;
		unsigned icount = dx_get_count(entries);
		int levels = frame - frames;
		struct dx_entry *entries2;
		struct dx_node *node2;
		struct buffer_head *bh2;

		if (levels && (dx_get_count(frames->entries) ==
			       dx_get_limit(frames->entries))) {
			ext4_warning(sb, __func__,
				     "Directory index full!");
			err = -ENOSPC;
			goto cleanup;
		}
		bh2 = ext4_append (handle, dir, &newblock, &err);
		if (!(bh2))
			goto cleanup;
		node2 = (struct dx_node *)(bh2->b_data);
		entries2 = node2->entries;
		node2->fake.rec_len = ext4_rec_len_to_disk(sb->s_blocksize);
		node2->fake.inode = 0;
		BUFFER_TRACE(frame->bh, "get_write_access");
		err = ext4_journal_get_write_access(handle, frame->bh);
		if (err)
			goto journal_error;
		if (levels) {
			unsigned icount1 = icount/2, icount2 = icount - icount1;
			unsigned hash2 = dx_get_hash(entries + icount1);
			dxtrace(printk(KERN_DEBUG "Split index %i/%i\n",
				       icount1, icount2));

			BUFFER_TRACE(frame->bh, "get_write_access"); /* index root */
			err = ext4_journal_get_write_access(handle,
							     frames[0].bh);
			if (err)
				goto journal_error;

			memcpy((char *) entries2, (char *) (entries + icount1),
			       icount2 * sizeof(struct dx_entry));
			dx_set_count(entries, icount1);
			dx_set_count(entries2, icount2);
			dx_set_limit(entries2, dx_node_limit(dir));

			/* Which index block gets the new entry? */
			if (at - entries >= icount1) {
				frame->at = at = at - entries - icount1 + entries2;
				frame->entries = entries = entries2;
				swap(frame->bh, bh2);
			}
			dx_insert_block(frames + 0, hash2, newblock);
			dxtrace(dx_show_index("node", frames[1].entries));
			dxtrace(dx_show_index("node",
			       ((struct dx_node *) bh2->b_data)->entries));
			err = ext4_handle_dirty_metadata(handle, inode, bh2);
			if (err)
				goto journal_error;
			brelse (bh2);
		} else {
			dxtrace(printk(KERN_DEBUG
				       "Creating second level index...\n"));
			memcpy((char *) entries2, (char *) entries,
			       icount * sizeof(struct dx_entry));
			dx_set_limit(entries2, dx_node_limit(dir));

			/* Set up root */
			dx_set_count(entries, 1);
			dx_set_block(entries + 0, newblock);
			((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels = 1;

			/* Add new access path frame */
			frame = frames + 1;
			frame->at = at = at - entries + entries2;
			frame->entries = entries = entries2;
			frame->bh = bh2;
			err = ext4_journal_get_write_access(handle,
							     frame->bh);
			if (err)
				goto journal_error;
		}
		ext4_handle_dirty_metadata(handle, inode, frames[0].bh);
	}
	de = do_split(handle, dir, &bh, frame, &hinfo, &err);
	if (!de)
		goto cleanup;
	err = add_dirent_to_buf(handle, dentry, inode, de, bh);
	bh = NULL;
	goto cleanup;

journal_error:
	ext4_std_error(dir->i_sb, err);
cleanup:
	if (bh)
		brelse(bh);
	dx_release(frames);
	return err;
}

Project: linux-2.6

static int ext4_delete_entry(handle_t *handle,
			     struct inode *dir,
			     struct ext4_dir_entry_2 *de_del,
			     struct buffer_head *bh)
{
	struct ext4_dir_entry_2 *de, *pde;
	int i;

	i = 0;
	pde = NULL;
	de = (struct ext4_dir_entry_2 *) bh->b_data;
	while (i < bh->b_size) {
		if (!ext4_check_dir_entry("ext4_delete_entry", dir, de, bh, i))
			return -EIO;
		if (de == de_del)  {
			BUFFER_TRACE(bh, "get_write_access");
			ext4_journal_get_write_access(handle, bh);
			if (pde)
				pde->rec_len = ext4_rec_len_to_disk(
					ext4_rec_len_from_disk(pde->rec_len) +
					ext4_rec_len_from_disk(de->rec_len));
			else
				de->inode = 0;
			dir->i_version++;
			BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
			ext4_handle_dirty_metadata(handle, dir, bh);
			return 0;
		}
		i += ext4_rec_len_from_disk(de->rec_len);
		pde = de;
		de = ext4_next_entry(de);
	}
	return -ENOENT;
}

Project: linux-2.6

static int ext4_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
	handle_t *handle;
	struct inode *inode;
	struct buffer_head *dir_block;
	struct ext4_dir_entry_2 *de;
	int err, retries = 0;

	if (EXT4_DIR_LINK_MAX(dir))
		return -EMLINK;

retry:
	handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
					EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
					2*EXT4_QUOTA_INIT_BLOCKS(dir->i_sb));
	if (IS_ERR(handle))
		return PTR_ERR(handle);

	if (IS_DIRSYNC(dir))
		ext4_handle_sync(handle);

	inode = ext4_new_inode(handle, dir, S_IFDIR | mode);
	err = PTR_ERR(inode);
	if (IS_ERR(inode))
		goto out_stop;

	inode->i_op = &ext4_dir_inode_operations;
	inode->i_fop = &ext4_dir_operations;
	inode->i_size = EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
	dir_block = ext4_bread(handle, inode, 0, 1, &err);
	if (!dir_block)
		goto out_clear_inode;
	BUFFER_TRACE(dir_block, "get_write_access");
	ext4_journal_get_write_access(handle, dir_block);
	de = (struct ext4_dir_entry_2 *) dir_block->b_data;
	de->inode = cpu_to_le32(inode->i_ino);
	de->name_len = 1;
	de->rec_len = ext4_rec_len_to_disk(EXT4_DIR_REC_LEN(de->name_len));
	strcpy(de->name, ".");
	ext4_set_de_type(dir->i_sb, de, S_IFDIR);
	de = ext4_next_entry(de);
	de->inode = cpu_to_le32(dir->i_ino);
	de->rec_len = ext4_rec_len_to_disk(inode->i_sb->s_blocksize -
						EXT4_DIR_REC_LEN(1));
	de->name_len = 2;
	strcpy(de->name, "..");
	ext4_set_de_type(dir->i_sb, de, S_IFDIR);
	inode->i_nlink = 2;
	BUFFER_TRACE(dir_block, "call ext4_handle_dirty_metadata");
	ext4_handle_dirty_metadata(handle, dir, dir_block);
	brelse(dir_block);
	ext4_mark_inode_dirty(handle, inode);
	err = ext4_add_entry(handle, dentry, inode);
	if (err) {
out_clear_inode:
		clear_nlink(inode);
		unlock_new_inode(inode);
		ext4_mark_inode_dirty(handle, inode);
		iput(inode);
		goto out_stop;
	}
	ext4_inc_count(handle, dir);
	ext4_update_dx_flag(dir);
	ext4_mark_inode_dirty(handle, dir);
	d_instantiate(dentry, inode);
	unlock_new_inode(inode);
out_stop:
	ext4_journal_stop(handle);
	if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
		goto retry;
	return err;
}