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authorZheng Liu <wenqing.lz@taobao.com>2013-03-10 21:13:05 -0400
committerTheodore Ts'o <tytso@mit.edu>2013-03-10 21:13:05 -0400
commitadb2355104b2109e06ba5276485d187d023b2fd2 (patch)
treebb5e3ba551ec90d772e9605f21ba99c37119ff37 /fs/ext4/extents_status.c
parentcdee78433c138c2f2018a6884673739af2634787 (diff)
downloadlinux-adb2355104b2109e06ba5276485d187d023b2fd2.tar.bz2
ext4: update extent status tree after an extent is zeroed out
When we try to split an extent, this extent could be zeroed out and mark as initialized. But we don't know this in ext4_map_blocks because it only returns a length of allocated extent. Meanwhile we will mark this extent as uninitialized because we only check m_flags. This commit update extent status tree when we try to split an unwritten extent. We don't need to worry about the status of this extent because we always mark it as initialized. Signed-off-by: Zheng Liu <wenqing.lz@taobao.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: Dmitry Monakhov <dmonakhov@openvz.org>
Diffstat (limited to 'fs/ext4/extents_status.c')
-rw-r--r--fs/ext4/extents_status.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c
index d2a8cb74676b..fe3337a85ede 100644
--- a/fs/ext4/extents_status.c
+++ b/fs/ext4/extents_status.c
@@ -854,6 +854,23 @@ int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
return err;
}
+int ext4_es_zeroout(struct inode *inode, struct ext4_extent *ex)
+{
+ ext4_lblk_t ee_block;
+ ext4_fsblk_t ee_pblock;
+ unsigned int ee_len;
+
+ ee_block = le32_to_cpu(ex->ee_block);
+ ee_len = ext4_ext_get_actual_len(ex);
+ ee_pblock = ext4_ext_pblock(ex);
+
+ if (ee_len == 0)
+ return 0;
+
+ return ext4_es_insert_extent(inode, ee_block, ee_len, ee_pblock,
+ EXTENT_STATUS_WRITTEN);
+}
+
static int ext4_es_shrink(struct shrinker *shrink, struct shrink_control *sc)
{
struct ext4_sb_info *sbi = container_of(shrink,