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authorZheng Liu <wenqing.lz@taobao.com>2014-11-25 11:44:37 -0500
committerTheodore Ts'o <tytso@mit.edu>2014-11-25 11:44:37 -0500
commit2f8e0a7c6c89f850ebd5d6c0b9a08317030d1b89 (patch)
tree4e03e95c516bab8be44e23861626f0c0f29a3958 /fs/ext4/ext4.h
parentcbd7584e6ead1b79fb0b81573f158b57fa1f0b49 (diff)
ext4: cache extent hole in extent status tree for ext4_da_map_blocks()
Currently extent status tree doesn't cache extent hole when a write looks up in extent tree to make sure whether a block has been allocated or not. In this case, we don't put extent hole in extent cache because later this extent might be removed and a new delayed extent might be added back. But it will cause a defect when we do a lot of writes. If we don't put extent hole in extent cache, the following writes also need to access extent tree to look at whether or not a block has been allocated. It brings a cache miss. This commit fixes this defect. Also if the inode doesn't have any extent, this extent hole will be cached as well. Cc: Andreas Dilger <adilger.kernel@dilger.ca> Signed-off-by: Zheng Liu <wenqing.lz@taobao.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ext4.h')
-rw-r--r--fs/ext4/ext4.h4
1 files changed, 1 insertions, 3 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 7b3f3b1decff..98da4cda9d18 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -556,10 +556,8 @@ enum {
#define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
/* Do not take i_data_sem locking in ext4_map_blocks */
#define EXT4_GET_BLOCKS_NO_LOCK 0x0100
- /* Do not put hole in extent cache */
-#define EXT4_GET_BLOCKS_NO_PUT_HOLE 0x0200
/* Convert written extents to unwritten */
-#define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0400
+#define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0200
/*
* The bit position of these flags must not overlap with any of the