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@xxxxxxx>
---
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 c18b46f..13a3da2 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.
--
1.7.1
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