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authorJan Kara <jack@suse.cz>2013-04-12 00:03:42 -0400
committerTheodore Ts'o <tytso@mit.edu>2013-04-12 00:03:42 -0400
commitae4647fb7654676fc44a97e86eb35f9f06b99f66 (patch)
treed53fc9a2c50c0fda4f5eda9507ca5cb824e6ed0c
parent7b001d6a0c0c7b92e989c2c3b1d8e151f1df1acc (diff)
jbd2: reduce journal_head size
Remove unused t_cow_tid field (ext4 copy-on-write support doesn't seem to be happening) and change b_modified and b_jlist to bitfields thus saving 8 bytes in the structure. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
-rw-r--r--include/linux/journal-head.h11
1 files changed, 2 insertions, 9 deletions
diff --git a/include/linux/journal-head.h b/include/linux/journal-head.h
index c18b46f8aeeb..13a3da25ff07 100644
--- a/include/linux/journal-head.h
+++ b/include/linux/journal-head.h
@@ -31,21 +31,14 @@ struct journal_head {
/*
* Journalling list for this buffer [jbd_lock_bh_state()]
*/
- unsigned b_jlist;
+ unsigned b_jlist:4;
/*
* This flag signals the buffer has been modified by
* the currently running transaction
* [jbd_lock_bh_state()]
*/
- unsigned b_modified;
-
- /*
- * This feild tracks the last transaction id in which this buffer
- * has been cowed
- * [jbd_lock_bh_state()]
- */
- tid_t b_cow_tid;
+ unsigned b_modified:1;
/*
* Copy of the buffer data frozen for writing to the log.