[RFC 4/5] ext4: pass lblk and len explicitly to ext4_split_extent*()

[Ojaswin Mujoo]

Since these functions only use the map to determine lblk and len of
the split, pass them explicitly. This is in preparation for making
them work with extent size hints cleanly.

No functional change in this patch.

Signed-off-by: Ojaswin Mujoo <ojaswin@xxxxxxxxxxxxx>
---
 fs/ext4/extents.c | 57 +++++++++++++++++++++++++----------------------
 1 file changed, 30 insertions(+), 27 deletions(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 34e25eee6521..94aeb5b47971 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3347,7 +3347,8 @@ static struct ext4_ext_path *ext4_split_extent_at(handle_t *handle,
 static struct ext4_ext_path *ext4_split_extent(handle_t *handle,
 					       struct inode *inode,
 					       struct ext4_ext_path *path,
-					       struct ext4_map_blocks *map,
+					       ext4_lblk_t lblk,
+					       unsigned int len,
 					       int split_flag, int flags,
 					       unsigned int *allocated)
 {
@@ -3363,7 +3364,7 @@ static struct ext4_ext_path *ext4_split_extent(handle_t *handle,
 	ee_len = ext4_ext_get_actual_len(ex);
 	unwritten = ext4_ext_is_unwritten(ex);
 
-	if (map->m_lblk + map->m_len < ee_block + ee_len) {
+	if (lblk + len < ee_block + ee_len) {
 		split_flag1 = split_flag & EXT4_EXT_MAY_ZEROOUT;
 		flags1 = flags | EXT4_GET_BLOCKS_PRE_IO;
 		if (unwritten)
@@ -3372,28 +3373,28 @@ static struct ext4_ext_path *ext4_split_extent(handle_t *handle,
 		if (split_flag & EXT4_EXT_DATA_VALID2)
 			split_flag1 |= EXT4_EXT_DATA_VALID1;
 		path = ext4_split_extent_at(handle, inode, path,
-				map->m_lblk + map->m_len, split_flag1, flags1);
+				lblk + len, split_flag1, flags1);
 		if (IS_ERR(path))
 			return path;
 		/*
 		 * 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, path, flags);
+		path = ext4_find_extent(inode, lblk, path, flags);
 		if (IS_ERR(path))
 			return path;
 		depth = ext_depth(inode);
 		ex = path[depth].p_ext;
 		if (!ex) {
 			EXT4_ERROR_INODE(inode, "unexpected hole at %lu",
-					(unsigned long) map->m_lblk);
+					(unsigned long) lblk);
 			ext4_free_ext_path(path);
 			return ERR_PTR(-EFSCORRUPTED);
 		}
 		unwritten = ext4_ext_is_unwritten(ex);
 	}
 
-	if (map->m_lblk >= ee_block) {
+	if (lblk >= ee_block) {
 		split_flag1 = split_flag & EXT4_EXT_DATA_VALID2;
 		if (unwritten) {
 			split_flag1 |= EXT4_EXT_MARK_UNWRIT1;
@@ -3401,16 +3402,16 @@ static struct ext4_ext_path *ext4_split_extent(handle_t *handle,
 						     EXT4_EXT_MARK_UNWRIT2);
 		}
 		path = ext4_split_extent_at(handle, inode, path,
-				map->m_lblk, split_flag1, flags);
+				lblk, split_flag1, flags);
 		if (IS_ERR(path))
 			return path;
 	}
 
 	if (allocated) {
-		if (map->m_lblk + map->m_len > ee_block + ee_len)
-			*allocated = ee_len - (map->m_lblk - ee_block);
+		if (lblk + len > ee_block + ee_len)
+			*allocated = ee_len - (lblk - ee_block);
 		else
-			*allocated = map->m_len;
+			*allocated = len;
 	}
 	ext4_ext_show_leaf(inode, path);
 	return path;
@@ -3658,8 +3659,8 @@ ext4_ext_convert_to_initialized(handle_t *handle, struct inode *inode,
 	}
 
 fallback:
-	path = ext4_split_extent(handle, inode, path, &split_map, split_flag,
-				 flags, NULL);
+	path = ext4_split_extent(handle, inode, path, split_map.m_lblk,
+				 split_map.m_len, split_flag, flags, NULL);
 	if (IS_ERR(path))
 		return path;
 out:
@@ -3699,11 +3700,11 @@ ext4_ext_convert_to_initialized(handle_t *handle, struct inode *inode,
  * allocated pointer. Return an extent path pointer on success, or an error
  * pointer on failure.
  */
-static struct ext4_ext_path *ext4_split_convert_extents(handle_t *handle,
-					struct inode *inode,
-					struct ext4_map_blocks *map,
-					struct ext4_ext_path *path,
-					int flags, unsigned int *allocated)
+static struct ext4_ext_path *
+ext4_split_convert_extents(handle_t *handle, struct inode *inode,
+			   ext4_lblk_t lblk, unsigned int len,
+			   struct ext4_ext_path *path, int flags,
+			   unsigned int *allocated)
 {
 	ext4_lblk_t eof_block;
 	ext4_lblk_t ee_block;
@@ -3712,12 +3713,12 @@ static struct ext4_ext_path *ext4_split_convert_extents(handle_t *handle,
 	int split_flag = 0, depth;
 
 	ext_debug(inode, "logical block %llu, max_blocks %u\n",
-		  (unsigned long long)map->m_lblk, map->m_len);
+		  (unsigned long long)lblk, len);
 
 	eof_block = (EXT4_I(inode)->i_disksize + inode->i_sb->s_blocksize - 1)
 			>> inode->i_sb->s_blocksize_bits;
-	if (eof_block < map->m_lblk + map->m_len)
-		eof_block = map->m_lblk + map->m_len;
+	if (eof_block < lblk + len)
+		eof_block = lblk + len;
 	/*
 	 * It is safe to convert extent to initialized via explicit
 	 * zeroout only if extent is fully inside i_size or new_size.
@@ -3737,8 +3738,8 @@ static struct ext4_ext_path *ext4_split_convert_extents(handle_t *handle,
 		split_flag |= (EXT4_EXT_MARK_UNWRIT2 | EXT4_EXT_DATA_VALID2);
 	}
 	flags |= EXT4_GET_BLOCKS_PRE_IO;
-	return ext4_split_extent(handle, inode, path, map, split_flag, flags,
-				 allocated);
+	return ext4_split_extent(handle, inode, path, lblk, len, split_flag,
+				 flags, allocated);
 }
 
 static struct ext4_ext_path *
@@ -3773,7 +3774,7 @@ ext4_convert_unwritten_extents_endio(handle_t *handle, struct inode *inode,
 			     inode->i_ino, (unsigned long long)ee_block, ee_len,
 			     (unsigned long long)map->m_lblk, map->m_len);
 #endif
-		path = ext4_split_convert_extents(handle, inode, map, path,
+		path = ext4_split_convert_extents(handle, inode, map->m_lblk, map->m_len, path,
 						EXT4_GET_BLOCKS_CONVERT, NULL);
 		if (IS_ERR(path))
 			return path;
@@ -3837,8 +3838,9 @@ convert_initialized_extent(handle_t *handle, struct inode *inode,
 		  (unsigned long long)ee_block, ee_len);
 
 	if (ee_block != map->m_lblk || ee_len > map->m_len) {
-		path = ext4_split_convert_extents(handle, inode, map, path,
-				EXT4_GET_BLOCKS_CONVERT_UNWRITTEN, NULL);
+		path = ext4_split_convert_extents(
+			handle, inode, map->m_lblk, map->m_len, path,
+			EXT4_GET_BLOCKS_CONVERT_UNWRITTEN, NULL);
 		if (IS_ERR(path))
 			return path;
 
@@ -3909,8 +3911,9 @@ ext4_ext_handle_unwritten_extents(handle_t *handle, struct inode *inode,
 
 	/* get_block() before submitting IO, split the extent */
 	if (flags & EXT4_GET_BLOCKS_PRE_IO) {
-		path = ext4_split_convert_extents(handle, inode, map, path,
-				flags | EXT4_GET_BLOCKS_CONVERT, allocated);
+		path = ext4_split_convert_extents(
+			handle, inode, map->m_lblk, map->m_len, path,
+			flags | EXT4_GET_BLOCKS_CONVERT, allocated);
 		if (IS_ERR(path))
 			return path;
 		/*
-- 
2.43.5