ext4: get rid of ppath in ext4_find_extent()

The use of path and ppath is now very confusing, so to make the code more
readable, pass path between functions uniformly, and get rid of ppath.

Getting rid of ppath in ext4_find_extent() requires its caller to update
ppath. These ppaths will also be dropped later. No functional changes.

Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Tested-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Link: https://patch.msgid.link/20240822023545.1994557-12-libaokun@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

3 files changed, 34 insertions, 30 deletions

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 7c3438b431e4..93b15b182797 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -3714,7 +3714,7 @@ extern int ext4_ext_insert_extent(handle_t *, struct inode *,
 				  struct ext4_ext_path **,
 				  struct ext4_extent *, int);
 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
-					      struct ext4_ext_path **,
+					      struct ext4_ext_path *,
 					      int flags);
 extern void ext4_free_ext_path(struct ext4_ext_path *);
 extern int ext4_ext_check_inode(struct inode *inode);
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index e2f89ca3e138..c97e7a7e1476 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -884,11 +884,10 @@ void ext4_ext_tree_init(handle_t *handle, struct inode *inode)
 
 struct ext4_ext_path *
 ext4_find_extent(struct inode *inode, ext4_lblk_t block,
-		 struct ext4_ext_path **orig_path, int flags)
+		 struct ext4_ext_path *path, int flags)
 {
 	struct ext4_extent_header *eh;
 	struct buffer_head *bh;
-	struct ext4_ext_path *path = orig_path ? *orig_path : NULL;
 	short int depth, i, ppos = 0;
 	int ret;
 	gfp_t gfp_flags = GFP_NOFS;
@@ -909,7 +908,7 @@ ext4_find_extent(struct inode *inode, ext4_lblk_t block,
 		ext4_ext_drop_refs(path);
 		if (depth > path[0].p_maxdepth) {
 			kfree(path);
-			*orig_path = path = NULL;
+			path = NULL;
 		}
 	}
 	if (!path) {
@@ -960,14 +959,10 @@ ext4_find_extent(struct inode *inode, ext4_lblk_t block,
 
 	ext4_ext_show_path(inode, path);
 
-	if (orig_path)
-		*orig_path = path;
 	return path;
 
 err:
 	ext4_free_ext_path(path);
-	if (orig_path)
-		*orig_path = NULL;
 	return ERR_PTR(ret);
 }
 
@@ -1432,7 +1427,7 @@ repeat:
 		/* refill path */
 		path = ext4_find_extent(inode,
 				    (ext4_lblk_t)le32_to_cpu(newext->ee_block),
-				    ppath, gb_flags);
+				    path, gb_flags);
 		if (IS_ERR(path))
 			err = PTR_ERR(path);
 	} else {
@@ -1444,7 +1439,7 @@ repeat:
 		/* refill path */
 		path = ext4_find_extent(inode,
 				   (ext4_lblk_t)le32_to_cpu(newext->ee_block),
-				    ppath, gb_flags);
+				    path, gb_flags);
 		if (IS_ERR(path)) {
 			err = PTR_ERR(path);
 			goto out;
@@ -1460,8 +1455,8 @@ repeat:
 			goto repeat;
 		}
 	}
-
 out:
+	*ppath = IS_ERR(path) ? NULL : path;
 	return err;
 }
 
@@ -3263,15 +3258,17 @@ static int ext4_split_extent_at(handle_t *handle,
 	 * WARN_ON may be triggered in ext4_da_update_reserve_space() due to
 	 * an incorrect ee_len causing the i_reserved_data_blocks exception.
 	 */
-	path = ext4_find_extent(inode, ee_block, ppath,
+	path = ext4_find_extent(inode, ee_block, *ppath,
 				flags | EXT4_EX_NOFAIL);
 	if (IS_ERR(path)) {
 		EXT4_ERROR_INODE(inode, "Failed split extent on %u, err %ld",
 				 split, PTR_ERR(path));
+		*ppath = NULL;
 		return PTR_ERR(path);
 	}
 	depth = ext_depth(inode);
 	ex = path[depth].p_ext;
+	*ppath = path;
 
 	if (EXT4_EXT_MAY_ZEROOUT & split_flag) {
 		if (split_flag & (EXT4_EXT_DATA_VALID1|EXT4_EXT_DATA_VALID2)) {
@@ -3381,9 +3378,12 @@ static int ext4_split_extent(handle_t *handle,
 	 * Update path is required because previous ext4_split_extent_at() may
 	 * result in split of original leaf or extent zeroout.
 	 */
-	path = ext4_find_extent(inode, map->m_lblk, ppath, flags);
-	if (IS_ERR(path))
+	path = ext4_find_extent(inode, map->m_lblk, *ppath, flags);
+	if (IS_ERR(path)) {
+		*ppath = NULL;
 		return PTR_ERR(path);
+	}
+	*ppath = path;
 	depth = ext_depth(inode);
 	ex = path[depth].p_ext;
 	if (!ex) {
@@ -3769,9 +3769,12 @@ static int ext4_convert_unwritten_extents_endio(handle_t *handle,
 						 EXT4_GET_BLOCKS_CONVERT);
 		if (err < 0)
 			return err;
-		path = ext4_find_extent(inode, map->m_lblk, ppath, 0);
-		if (IS_ERR(path))
+		path = ext4_find_extent(inode, map->m_lblk, *ppath, 0);
+		if (IS_ERR(path)) {
+			*ppath = NULL;
 			return PTR_ERR(path);
+		}
+		*ppath = path;
 		depth = ext_depth(inode);
 		ex = path[depth].p_ext;
 	}
@@ -3827,9 +3830,12 @@ convert_initialized_extent(handle_t *handle, struct inode *inode,
 				EXT4_GET_BLOCKS_CONVERT_UNWRITTEN);
 		if (err < 0)
 			return err;
-		path = ext4_find_extent(inode, map->m_lblk, ppath, 0);
-		if (IS_ERR(path))
+		path = ext4_find_extent(inode, map->m_lblk, *ppath, 0);
+		if (IS_ERR(path)) {
+			*ppath = NULL;
 			return PTR_ERR(path);
+		}
+		*ppath = path;
 		depth = ext_depth(inode);
 		ex = path[depth].p_ext;
 		if (!ex) {
@@ -5190,7 +5196,7 @@ ext4_ext_shift_extents(struct inode *inode, handle_t *handle,
 	* won't be shifted beyond EXT_MAX_BLOCKS.
 	*/
 	if (SHIFT == SHIFT_LEFT) {
-		path = ext4_find_extent(inode, start - 1, &path,
+		path = ext4_find_extent(inode, start - 1, path,
 					EXT4_EX_NOCACHE);
 		if (IS_ERR(path))
 			return PTR_ERR(path);
@@ -5239,7 +5245,7 @@ again:
 	 * becomes NULL to indicate the end of the loop.
 	 */
 	while (iterator && start <= stop) {
-		path = ext4_find_extent(inode, *iterator, &path,
+		path = ext4_find_extent(inode, *iterator, path,
 					EXT4_EX_NOCACHE);
 		if (IS_ERR(path))
 			return PTR_ERR(path);
@@ -5821,11 +5827,8 @@ int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu)
 
 	/* search for the extent closest to the first block in the cluster */
 	path = ext4_find_extent(inode, EXT4_C2B(sbi, lclu), NULL, 0);
-	if (IS_ERR(path)) {
-		err = PTR_ERR(path);
-		path = NULL;
-		goto out;
-	}
+	if (IS_ERR(path))
+		return PTR_ERR(path);
 
 	depth = ext_depth(inode);
 
@@ -5909,7 +5912,7 @@ int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
 		if (ret)
 			goto out;
 
-		path = ext4_find_extent(inode, start, &path, 0);
+		path = ext4_find_extent(inode, start, path, 0);
 		if (IS_ERR(path))
 			return PTR_ERR(path);
 		ex = path[path->p_depth].p_ext;
@@ -5923,7 +5926,7 @@ int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
 			if (ret)
 				goto out;
 
-			path = ext4_find_extent(inode, start, &path, 0);
+			path = ext4_find_extent(inode, start, path, 0);
 			if (IS_ERR(path))
 				return PTR_ERR(path);
 			ex = path[path->p_depth].p_ext;
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index 228b56f7d047..d3e61f1be046 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -26,16 +26,17 @@ static inline int
 get_ext_path(struct inode *inode, ext4_lblk_t lblock,
 		struct ext4_ext_path **ppath)
 {
-	struct ext4_ext_path *path;
+	struct ext4_ext_path *path = *ppath;
 
-	path = ext4_find_extent(inode, lblock, ppath, EXT4_EX_NOCACHE);
+	*ppath = NULL;
+	path = ext4_find_extent(inode, lblock, path, EXT4_EX_NOCACHE);
 	if (IS_ERR(path))
 		return PTR_ERR(path);
 	if (path[ext_depth(inode)].p_ext == NULL) {
 		ext4_free_ext_path(path);
-		*ppath = NULL;
 		return -ENODATA;
 	}
+	*ppath = path;
 	return 0;
 }