diff options
| author | Jan Kara <jack@suse.cz> | 2013-04-12 00:03:42 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2013-04-12 00:03:42 -0400 |
| commit | ae4647fb7654676fc44a97e86eb35f9f06b99f66 (patch) | |
| tree | d53fc9a2c50c0fda4f5eda9507ca5cb824e6ed0c | |
| parent | 7b001d6a0c0c7b92e989c2c3b1d8e151f1df1acc (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.h | 11 |
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. |