Commit ae4647fb authored by Jan Kara's avatar Jan Kara Committed by Theodore Ts'o
Browse files

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: default avatarJan Kara <>
Signed-off-by: default avatar"Theodore Ts'o" <>
Reviewed-by: default avatarZheng Liu <>
parent 7b001d6a
......@@ -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.
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment