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authorTheodore Ts'o <tytso@mit.edu>2011-01-10 12:13:26 -0500
committerTheodore Ts'o <tytso@mit.edu>2011-01-10 12:13:26 -0500
commitb05e6ae58a13b56e3e11882c1fc71948c9b29760 (patch)
tree452cbadcbc8091b4db95f917f28b0f9de845dabf /fs/ext4/ext4.h
parent01f49d0b9d0209dc1194255b11601e4b94447b36 (diff)
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ext4: drop ec_type from the ext4_ext_cache structure
We can encode the ec_type information by using ee_len == 0 to denote EXT4_EXT_CACHE_NO, ee_start == 0 to denote EXT4_EXT_CACHE_GAP, and if neither is true, then the cache type must be EXT4_EXT_CACHE_EXTENT. This allows us to reduce the size of ext4_ext_inode by another 8 bytes. (ec_type is 4 bytes, plus another 4 bytes of padding) Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ext4.h')
-rw-r--r--fs/ext4/ext4.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 746a598..de937fc 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -738,12 +738,13 @@ do { \
/*
* storage for cached extent
+ * If ec_len == 0, then the cache is invalid.
+ * If ec_start == 0, then the cache represents a gap (null mapping)
*/
struct ext4_ext_cache {
ext4_fsblk_t ec_start;
ext4_lblk_t ec_block;
__u32 ec_len; /* must be 32bit to return holes */
- __u32 ec_type;
};
/*
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