X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=fs%2Fext3%2Fnamei.c;h=4ab6f76e63d0cda8e125672153571038f48b16c6;hb=ed5d2cac114202fe2978a9cbcab8f5032796d538;hp=9bb046df827a7a7a4d694dad36d727a71237a652;hpb=ec4883b015c3212f6f6d04fb2ff45f528492f598;p=powerpc.git

diff --git a/fs/ext3/namei.c b/fs/ext3/namei.c
index 9bb046df82..4ab6f76e63 100644
--- a/fs/ext3/namei.c
+++ b/fs/ext3/namei.c
@@ -140,10 +140,10 @@ struct dx_frame
 struct dx_map_entry
 {
 	u32 hash;
-	u32 offs;
+	u16 offs;
+	u16 size;
 };
 
-#ifdef CONFIG_EXT3_INDEX
 static inline unsigned dx_get_block (struct dx_entry *entry);
 static void dx_set_block (struct dx_entry *entry, unsigned value);
 static inline unsigned dx_get_hash (struct dx_entry *entry);
@@ -176,6 +176,16 @@ static struct buffer_head * ext3_dx_find_entry(struct dentry *dentry,
 static int ext3_dx_add_entry(handle_t *handle, struct dentry *dentry,
 			     struct inode *inode);
 
+/*
+ * p is at least 6 bytes before the end of page
+ */
+static inline struct ext3_dir_entry_2 *
+ext3_next_entry(struct ext3_dir_entry_2 *p)
+{
+	return (struct ext3_dir_entry_2 *)((char *)p +
+		ext3_rec_len_from_disk(p->rec_len));
+}
+
 /*
  * Future: use high four bits of block for coalesce-on-delete flags
  * Mask them off for now.
@@ -280,7 +290,7 @@ static struct stats dx_show_leaf(struct dx_hash_info *hinfo, struct ext3_dir_ent
 			space += EXT3_DIR_REC_LEN(de->name_len);
 			names++;
 		}
-		de = (struct ext3_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
+		de = ext3_next_entry(de);
 	}
 	printk("(%i)\n", names);
 	return (struct stats) { names, space, 1 };
@@ -379,13 +389,28 @@ dx_probe(struct dentry *dentry, struct inode *dir,
 
 	entries = (struct dx_entry *) (((char *)&root->info) +
 				       root->info.info_length);
-	assert(dx_get_limit(entries) == dx_root_limit(dir,
-						      root->info.info_length));
+
+	if (dx_get_limit(entries) != dx_root_limit(dir,
+						   root->info.info_length)) {
+		ext3_warning(dir->i_sb, __FUNCTION__,
+			     "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);
-		assert (count && count <= dx_get_limit(entries));
+		if (!count || count > dx_get_limit(entries)) {
+			ext3_warning(dir->i_sb, __FUNCTION__,
+				     "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)
@@ -423,8 +448,15 @@ dx_probe(struct dentry *dentry, struct inode *dir,
 		if (!(bh = ext3_bread (NULL,dir, dx_get_block(at), 0, err)))
 			goto fail2;
 		at = entries = ((struct dx_node *) bh->b_data)->entries;
-		assert (dx_get_limit(entries) == dx_node_limit (dir));
+		if (dx_get_limit(entries) != dx_node_limit (dir)) {
+			ext3_warning(dir->i_sb, __FUNCTION__,
+				     "dx entry: limit != node limit");
+			brelse(bh);
+			*err = ERR_BAD_DX_DIR;
+			goto fail2;
+		}
 		frame++;
+		frame->bh = NULL;
 	}
 fail2:
 	while (frame >= frame_in) {
@@ -432,6 +464,10 @@ fail2:
 		frame--;
 	}
 fail:
+	if (*err == ERR_BAD_DX_DIR)
+		ext3_warning(dir->i_sb, __FUNCTION__,
+			     "Corrupt dir inode %ld, running e2fsck is "
+			     "recommended.", dir->i_ino);
 	return NULL;
 }
 
@@ -520,14 +556,6 @@ static int ext3_htree_next_block(struct inode *dir, __u32 hash,
 }
 
 
-/*
- * p is at least 6 bytes before the end of page
- */
-static inline struct ext3_dir_entry_2 *ext3_next_entry(struct ext3_dir_entry_2 *p)
-{
-	return (struct ext3_dir_entry_2 *)((char*)p + le16_to_cpu(p->rec_len));
-}
-
 /*
  * This function fills a red-black tree with information from a
  * directory block.  It returns the number directory entries loaded
@@ -671,6 +699,10 @@ errout:
  * Directory block splitting, compacting
  */
 
+/*
+ * Create map of hash values, offsets, and sizes, stored at end of block.
+ * Returns number of entries mapped.
+ */
 static int dx_make_map (struct ext3_dir_entry_2 *de, int size,
 			struct dx_hash_info *hinfo, struct dx_map_entry *map_tail)
 {
@@ -684,16 +716,18 @@ static int dx_make_map (struct ext3_dir_entry_2 *de, int size,
 			ext3fs_dirhash(de->name, de->name_len, &h);
 			map_tail--;
 			map_tail->hash = h.hash;
-			map_tail->offs = (u32) ((char *) de - base);
+			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 = (struct ext3_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
+		de = ext3_next_entry(de);
 	}
 	return count;
 }
 
+/* Sort map by hash value */
 static void dx_sort_map (struct dx_map_entry *map, unsigned count)
 {
         struct dx_map_entry *p, *q, *top = map + count - 1;
@@ -735,8 +769,6 @@ static void dx_insert_block(struct dx_frame *frame, u32 hash, u32 block)
 	dx_set_block(new, block);
 	dx_set_count(entries, count + 1);
 }
-#endif
-
 
 static void ext3_update_dx_flag(struct inode *inode)
 {
@@ -792,7 +824,7 @@ static inline int search_dirblock(struct buffer_head * bh,
 			return 1;
 		}
 		/* prevent looping on a bad block */
-		de_len = le16_to_cpu(de->rec_len);
+		de_len = ext3_rec_len_from_disk(de->rec_len);
 		if (de_len <= 0)
 			return -1;
 		offset += de_len;
@@ -838,7 +870,6 @@ static struct buffer_head * ext3_find_entry (struct dentry *dentry,
 	name = dentry->d_name.name;
 	if (namelen > EXT3_NAME_LEN)
 		return NULL;
-#ifdef CONFIG_EXT3_INDEX
 	if (is_dx(dir)) {
 		bh = ext3_dx_find_entry(dentry, res_dir, &err);
 		/*
@@ -850,7 +881,6 @@ static struct buffer_head * ext3_find_entry (struct dentry *dentry,
 			return bh;
 		dxtrace(printk("ext3_find_entry: dx failed, falling back\n"));
 	}
-#endif
 	nblocks = dir->i_size >> EXT3_BLOCK_SIZE_BITS(sb);
 	start = EXT3_I(dir)->i_dir_start_lookup;
 	if (start >= nblocks)
@@ -926,7 +956,6 @@ cleanup_and_exit:
 	return ret;
 }
 
-#ifdef CONFIG_EXT3_INDEX
 static struct buffer_head * ext3_dx_find_entry(struct dentry *dentry,
 		       struct ext3_dir_entry_2 **res_dir, int *err)
 {
@@ -994,7 +1023,6 @@ errout:
 	dx_release (frames);
 	return NULL;
 }
-#endif
 
 static struct dentry *ext3_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd)
 {
@@ -1019,6 +1047,11 @@ static struct dentry *ext3_lookup(struct inode * dir, struct dentry *dentry, str
 
 		if (!inode)
 			return ERR_PTR(-EACCES);
+
+		if (is_bad_inode(inode)) {
+			iput(inode);
+			return ERR_PTR(-ENOENT);
+		}
 	}
 	return d_splice_alias(inode, dentry);
 }
@@ -1054,6 +1087,11 @@ struct dentry *ext3_get_parent(struct dentry *child)
 	if (!inode)
 		return ERR_PTR(-EACCES);
 
+	if (is_bad_inode(inode)) {
+		iput(inode);
+		return ERR_PTR(-ENOENT);
+	}
+
 	parent = d_alloc_anon(inode);
 	if (!parent) {
 		iput(inode);
@@ -1080,7 +1118,10 @@ static inline void ext3_set_de_type(struct super_block *sb,
 		de->file_type = ext3_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
 }
 
-#ifdef CONFIG_EXT3_INDEX
+/*
+ * Move count entries from end of map between two memory locations.
+ * Returns pointer to last entry moved.
+ */
 static struct ext3_dir_entry_2 *
 dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count)
 {
@@ -1091,7 +1132,7 @@ dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count)
 		rec_len = EXT3_DIR_REC_LEN(de->name_len);
 		memcpy (to, de, rec_len);
 		((struct ext3_dir_entry_2 *) to)->rec_len =
-				cpu_to_le16(rec_len);
+				ext3_rec_len_to_disk(rec_len);
 		de->inode = 0;
 		map++;
 		to += rec_len;
@@ -1099,6 +1140,10 @@ dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count)
 	return (struct ext3_dir_entry_2 *) (to - rec_len);
 }
 
+/*
+ * Compact each dir entry in the range to the minimal rec_len.
+ * Returns pointer to last entry in range.
+ */
 static struct ext3_dir_entry_2* dx_pack_dirents(char *base, int size)
 {
 	struct ext3_dir_entry_2 *next, *to, *prev, *de = (struct ext3_dir_entry_2 *) base;
@@ -1106,13 +1151,12 @@ static struct ext3_dir_entry_2* dx_pack_dirents(char *base, int size)
 
 	prev = to = de;
 	while ((char*)de < base + size) {
-		next = (struct ext3_dir_entry_2 *) ((char *) de +
-						    le16_to_cpu(de->rec_len));
+		next = ext3_next_entry(de);
 		if (de->inode && de->name_len) {
 			rec_len = EXT3_DIR_REC_LEN(de->name_len);
 			if (de > to)
 				memmove(to, de, rec_len);
-			to->rec_len = cpu_to_le16(rec_len);
+			to->rec_len = ext3_rec_len_to_disk(rec_len);
 			prev = to;
 			to = (struct ext3_dir_entry_2 *) (((char *) to) + rec_len);
 		}
@@ -1121,6 +1165,11 @@ static struct ext3_dir_entry_2* dx_pack_dirents(char *base, int size)
 	return prev;
 }
 
+/*
+ * Split a full leaf block to make room for a new dir entry.
+ * Allocate a new block, and move entries so that they are approx. equally full.
+ * Returns pointer to de in block into which the new entry will be inserted.
+ */
 static struct ext3_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)
@@ -1132,7 +1181,7 @@ static struct ext3_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
 	u32 hash2;
 	struct dx_map_entry *map;
 	char *data1 = (*bh)->b_data, *data2;
-	unsigned split;
+	unsigned split, move, size, i;
 	struct ext3_dir_entry_2 *de = NULL, *de2;
 	int	err = 0;
 
@@ -1160,8 +1209,19 @@ static struct ext3_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
 	count = dx_make_map ((struct ext3_dir_entry_2 *) data1,
 			     blocksize, hinfo, map);
 	map -= count;
-	split = count/2; // need to adjust to actual middle
 	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("Split block %i at %x, %i/%i\n",
@@ -1170,8 +1230,8 @@ static struct ext3_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
 	/* 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 = cpu_to_le16(data1 + blocksize - (char *) de);
-	de2->rec_len = cpu_to_le16(data2 + blocksize - (char *) de2);
+	de->rec_len = ext3_rec_len_to_disk(data1 + blocksize - (char *) de);
+	de2->rec_len = ext3_rec_len_to_disk(data2 + blocksize - (char *) de2);
 	dxtrace(dx_show_leaf (hinfo, (struct ext3_dir_entry_2 *) data1, blocksize, 1));
 	dxtrace(dx_show_leaf (hinfo, (struct ext3_dir_entry_2 *) data2, blocksize, 1));
 
@@ -1201,7 +1261,6 @@ errout:
 	*error = err;
 	return NULL;
 }
-#endif
 
 
 /*
@@ -1242,7 +1301,7 @@ static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry,
 				return -EEXIST;
 			}
 			nlen = EXT3_DIR_REC_LEN(de->name_len);
-			rlen = le16_to_cpu(de->rec_len);
+			rlen = ext3_rec_len_from_disk(de->rec_len);
 			if ((de->inode? rlen - nlen: rlen) >= reclen)
 				break;
 			de = (struct ext3_dir_entry_2 *)((char *)de + rlen);
@@ -1261,11 +1320,11 @@ static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry,
 
 	/* By now the buffer is marked for journaling */
 	nlen = EXT3_DIR_REC_LEN(de->name_len);
-	rlen = le16_to_cpu(de->rec_len);
+	rlen = ext3_rec_len_from_disk(de->rec_len);
 	if (de->inode) {
 		struct ext3_dir_entry_2 *de1 = (struct ext3_dir_entry_2 *)((char *)de + nlen);
-		de1->rec_len = cpu_to_le16(rlen - nlen);
-		de->rec_len = cpu_to_le16(nlen);
+		de1->rec_len = ext3_rec_len_to_disk(rlen - nlen);
+		de->rec_len = ext3_rec_len_to_disk(nlen);
 		de = de1;
 	}
 	de->file_type = EXT3_FT_UNKNOWN;
@@ -1299,7 +1358,6 @@ static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry,
 	return 0;
 }
 
-#ifdef CONFIG_EXT3_INDEX
 /*
  * This converts a one block unindexed directory to a 3 block indexed
  * directory, and adds the dentry to the indexed directory.
@@ -1343,17 +1401,18 @@ static int make_indexed_dir(handle_t *handle, struct dentry *dentry,
 
 	/* The 0th block becomes the root, move the dirents out */
 	fde = &root->dotdot;
-	de = (struct ext3_dir_entry_2 *)((char *)fde + le16_to_cpu(fde->rec_len));
+	de = (struct ext3_dir_entry_2 *)((char *)fde +
+			ext3_rec_len_from_disk(fde->rec_len));
 	len = ((char *) root) + blocksize - (char *) de;
 	memcpy (data1, de, len);
 	de = (struct ext3_dir_entry_2 *) data1;
 	top = data1 + len;
-	while ((char *)(de2=(void*)de+le16_to_cpu(de->rec_len)) < top)
+	while ((char *)(de2 = ext3_next_entry(de)) < top)
 		de = de2;
-	de->rec_len = cpu_to_le16(data1 + blocksize - (char *) de);
+	de->rec_len = ext3_rec_len_to_disk(data1 + blocksize - (char *) de);
 	/* Initialize the root; the dot dirents already exist */
 	de = (struct ext3_dir_entry_2 *) (&root->dotdot);
-	de->rec_len = cpu_to_le16(blocksize - EXT3_DIR_REC_LEN(2));
+	de->rec_len = ext3_rec_len_to_disk(blocksize - EXT3_DIR_REC_LEN(2));
 	memset (&root->info, 0, sizeof(root->info));
 	root->info.info_length = sizeof(root->info);
 	root->info.hash_version = EXT3_SB(dir->i_sb)->s_def_hash_version;
@@ -1378,7 +1437,6 @@ static int make_indexed_dir(handle_t *handle, struct dentry *dentry,
 
 	return add_dirent_to_buf(handle, dentry, inode, de, bh);
 }
-#endif
 
 /*
  *	ext3_add_entry()
@@ -1399,9 +1457,7 @@ static int ext3_add_entry (handle_t *handle, struct dentry *dentry,
 	struct ext3_dir_entry_2 *de;
 	struct super_block * sb;
 	int	retval;
-#ifdef CONFIG_EXT3_INDEX
 	int	dx_fallback=0;
-#endif
 	unsigned blocksize;
 	u32 block, blocks;
 
@@ -1409,7 +1465,6 @@ static int ext3_add_entry (handle_t *handle, struct dentry *dentry,
 	blocksize = sb->s_blocksize;
 	if (!dentry->d_name.len)
 		return -EINVAL;
-#ifdef CONFIG_EXT3_INDEX
 	if (is_dx(dir)) {
 		retval = ext3_dx_add_entry(handle, dentry, inode);
 		if (!retval || (retval != ERR_BAD_DX_DIR))
@@ -1418,7 +1473,6 @@ static int ext3_add_entry (handle_t *handle, struct dentry *dentry,
 		dx_fallback++;
 		ext3_mark_inode_dirty(handle, dir);
 	}
-#endif
 	blocks = dir->i_size >> sb->s_blocksize_bits;
 	for (block = 0, offset = 0; block < blocks; block++) {
 		bh = ext3_bread(handle, dir, block, 0, &retval);
@@ -1428,11 +1482,9 @@ static int ext3_add_entry (handle_t *handle, struct dentry *dentry,
 		if (retval != -ENOSPC)
 			return retval;
 
-#ifdef CONFIG_EXT3_INDEX
 		if (blocks == 1 && !dx_fallback &&
 		    EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_DIR_INDEX))
 			return make_indexed_dir(handle, dentry, inode, bh);
-#endif
 		brelse(bh);
 	}
 	bh = ext3_append(handle, dir, &block, &retval);
@@ -1440,11 +1492,10 @@ static int ext3_add_entry (handle_t *handle, struct dentry *dentry,
 		return retval;
 	de = (struct ext3_dir_entry_2 *) bh->b_data;
 	de->inode = 0;
-	de->rec_len = cpu_to_le16(blocksize);
+	de->rec_len = ext3_rec_len_to_disk(blocksize);
 	return add_dirent_to_buf(handle, dentry, inode, de, bh);
 }
 
-#ifdef CONFIG_EXT3_INDEX
 /*
  * Returns 0 for success, or a negative error value
  */
@@ -1504,7 +1555,7 @@ static int ext3_dx_add_entry(handle_t *handle, struct dentry *dentry,
 			goto cleanup;
 		node2 = (struct dx_node *)(bh2->b_data);
 		entries2 = node2->entries;
-		node2->fake.rec_len = cpu_to_le16(sb->s_blocksize);
+		node2->fake.rec_len = ext3_rec_len_to_disk(sb->s_blocksize);
 		node2->fake.inode = 0;
 		BUFFER_TRACE(frame->bh, "get_write_access");
 		err = ext3_journal_get_write_access(handle, frame->bh);
@@ -1579,7 +1630,6 @@ cleanup:
 	dx_release(frames);
 	return err;
 }
-#endif
 
 /*
  * ext3_delete_entry deletes a directory entry by merging it with the
@@ -1603,9 +1653,9 @@ static int ext3_delete_entry (handle_t *handle,
 			BUFFER_TRACE(bh, "get_write_access");
 			ext3_journal_get_write_access(handle, bh);
 			if (pde)
-				pde->rec_len =
-					cpu_to_le16(le16_to_cpu(pde->rec_len) +
-						    le16_to_cpu(de->rec_len));
+				pde->rec_len = ext3_rec_len_to_disk(
+					ext3_rec_len_from_disk(pde->rec_len) +
+					ext3_rec_len_from_disk(de->rec_len));
 			else
 				de->inode = 0;
 			dir->i_version++;
@@ -1613,10 +1663,9 @@ static int ext3_delete_entry (handle_t *handle,
 			ext3_journal_dirty_metadata(handle, bh);
 			return 0;
 		}
-		i += le16_to_cpu(de->rec_len);
+		i += ext3_rec_len_from_disk(de->rec_len);
 		pde = de;
-		de = (struct ext3_dir_entry_2 *)
-			((char *) de + le16_to_cpu(de->rec_len));
+		de = ext3_next_entry(de);
 	}
 	return -ENOENT;
 }
@@ -1750,13 +1799,13 @@ retry:
 	de = (struct ext3_dir_entry_2 *) dir_block->b_data;
 	de->inode = cpu_to_le32(inode->i_ino);
 	de->name_len = 1;
-	de->rec_len = cpu_to_le16(EXT3_DIR_REC_LEN(de->name_len));
+	de->rec_len = ext3_rec_len_to_disk(EXT3_DIR_REC_LEN(de->name_len));
 	strcpy (de->name, ".");
 	ext3_set_de_type(dir->i_sb, de, S_IFDIR);
-	de = (struct ext3_dir_entry_2 *)
-			((char *) de + le16_to_cpu(de->rec_len));
+	de = ext3_next_entry(de);
 	de->inode = cpu_to_le32(dir->i_ino);
-	de->rec_len = cpu_to_le16(inode->i_sb->s_blocksize-EXT3_DIR_REC_LEN(1));
+	de->rec_len = ext3_rec_len_to_disk(inode->i_sb->s_blocksize -
+					EXT3_DIR_REC_LEN(1));
 	de->name_len = 2;
 	strcpy (de->name, "..");
 	ext3_set_de_type(dir->i_sb, de, S_IFDIR);
@@ -1808,8 +1857,7 @@ static int empty_dir (struct inode * inode)
 		return 1;
 	}
 	de = (struct ext3_dir_entry_2 *) bh->b_data;
-	de1 = (struct ext3_dir_entry_2 *)
-			((char *) de + le16_to_cpu(de->rec_len));
+	de1 = ext3_next_entry(de);
 	if (le32_to_cpu(de->inode) != inode->i_ino ||
 			!le32_to_cpu(de1->inode) ||
 			strcmp (".", de->name) ||
@@ -1820,9 +1868,9 @@ static int empty_dir (struct inode * inode)
 		brelse (bh);
 		return 1;
 	}
-	offset = le16_to_cpu(de->rec_len) + le16_to_cpu(de1->rec_len);
-	de = (struct ext3_dir_entry_2 *)
-			((char *) de1 + le16_to_cpu(de1->rec_len));
+	offset = ext3_rec_len_from_disk(de->rec_len) +
+			ext3_rec_len_from_disk(de1->rec_len);
+	de = ext3_next_entry(de1);
 	while (offset < inode->i_size ) {
 		if (!bh ||
 			(void *) de >= (void *) (bh->b_data+sb->s_blocksize)) {
@@ -1851,9 +1899,8 @@ static int empty_dir (struct inode * inode)
 			brelse (bh);
 			return 0;
 		}
-		offset += le16_to_cpu(de->rec_len);
-		de = (struct ext3_dir_entry_2 *)
-				((char *) de + le16_to_cpu(de->rec_len));
+		offset += ext3_rec_len_from_disk(de->rec_len);
+		de = ext3_next_entry(de);
 	}
 	brelse (bh);
 	return 1;
@@ -2207,8 +2254,7 @@ retry:
 }
 
 #define PARENT_INO(buffer) \
-	((struct ext3_dir_entry_2 *) ((char *) buffer + \
-	le16_to_cpu(((struct ext3_dir_entry_2 *) buffer)->rec_len)))->inode
+	(ext3_next_entry((struct ext3_dir_entry_2 *)(buffer))->inode)
 
 /*
  * Anybody can rename anything with this: the permission checks are left to the