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authorRobin Dong <sanbai@taobao.com>2011-07-27 21:29:33 -0400
committerTheodore Ts'o <tytso@mit.edu>2011-07-27 21:29:33 -0400
commit0e1147b001793593624e80b3c0a1790822b6baca (patch)
treeb43cf0a3f8cb4733386867c4b06d92eb0025f04a /fs/ext4/extents.c
parent668f4dc5593327fadc95b33189c375f7178ef88e (diff)
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>
Diffstat (limited to 'fs/ext4/extents.c')
-rw-r--r--fs/ext4/extents.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 4d73e11ae883..a25bbdc7d493 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -2101,8 +2101,6 @@ ext4_ext_in_cache(struct inode *inode, ext4_lblk_t block,
/*
* 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 @@ static int ext4_ext_rm_idx(handle_t *handle, struct inode *inode,
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)