ext4: add punching hole support for non-extent-mapped files
This patch add supports for indirect file support punching hole. It
is almost the same as ext4_ext_punch_hole. First, we invalidate all
pages between this hole, and then we try to deallocate all blocks of
this hole.
A recursive function is used to handle deallocation of blocks. In
this function, it iterates over the entries in inode's i_blocks or
indirect blocks, and try to free the block for each one of them.
After applying this patch, xfstest #255 will not pass w/o extent because
indirect-based file doesn't support unwritten extents.
Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 5abf89c..80683bf 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3557,10 +3557,8 @@
if (!S_ISREG(inode->i_mode))
return -EOPNOTSUPP;
- if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) {
- /* TODO: Add support for non extent hole punching */
- return -EOPNOTSUPP;
- }
+ if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
+ return ext4_ind_punch_hole(file, offset, length);
if (EXT4_SB(inode->i_sb)->s_cluster_ratio > 1) {
/* TODO: Add support for bigalloc file systems */