ext4: add action of moving index in ext4_ext_rm_idx for Punch Hole
The old function ext4_ext_rm_idx is used only for truncate case
because it just remove last index in extent-index-block. When punching
hole, it usually needed to remove "middle" index, therefore we must
move indexes which after it forward.
(I create a file with 1 depth extent tree and punch hole in the middle
of it, the last index in index-block strangly gone, so I find out this
bug)
Signed-off-by: Robin Dong <sanbai@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 4d73e11..a25bbdc 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -2101,8 +2101,6 @@
/*
* ext4_ext_rm_idx:
* removes index from the index block.
- * It's used in truncate case only, thus all requests are for
- * last index in the block only.
*/
static int ext4_ext_rm_idx(handle_t *handle, struct inode *inode,
struct ext4_ext_path *path)
@@ -2120,6 +2118,13 @@
err = ext4_ext_get_access(handle, inode, path);
if (err)
return err;
+
+ if (path->p_idx != EXT_LAST_INDEX(path->p_hdr)) {
+ int len = EXT_LAST_INDEX(path->p_hdr) - path->p_idx;
+ len *= sizeof(struct ext4_extent_idx);
+ memmove(path->p_idx, path->p_idx + 1, len);
+ }
+
le16_add_cpu(&path->p_hdr->eh_entries, -1);
err = ext4_ext_dirty(handle, inode, path);
if (err)
