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xfs: store xfs_mount in the buftarg instead of in the xfs_buf

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Each buffer contains both a buftarg pointer and a mount pointer. If
we add a mount pointer into the buftarg, we can avoid needing the
b_mount field in every buffer and grab it from the buftarg when
needed instead. This shrinks the xfs_buf by 8 bytes.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Dave Chinner
2010-09-22 10:47:20 +10:00
committed by Alex Elder
parent 5adc94c247
commit ebad861b57
5 changed files with 20 additions and 21 deletions
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3
fs/xfs/xfs_buf_item.c
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@@ -692,8 +692,7 @@ xfs_buf_item_init(
* the first. If we do already have one, there is
* nothing to do here so return.
*/
if (bp->b_mount != mp)
bp->b_mount = mp;
ASSERT(bp->b_target->bt_mount == mp);
if (XFS_BUF_FSPRIVATE(bp, void *) != NULL) {
lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *);
if (lip->li_type == XFS_LI_BUF) {