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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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8
fs/xfs/linux-2.6/xfs_super.c
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@@ -758,18 +758,20 @@ xfs_open_devices(
* Setup xfs_mount buffer target pointers
*/
error = ENOMEM;
mp->m_ddev_targp = xfs_alloc_buftarg(ddev, 0, mp->m_fsname);
mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, 0, mp->m_fsname);
if (!mp->m_ddev_targp)
goto out_close_rtdev;
if (rtdev) {
mp->m_rtdev_targp = xfs_alloc_buftarg(rtdev, 1, mp->m_fsname);
mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, 1,
mp->m_fsname);
if (!mp->m_rtdev_targp)
goto out_free_ddev_targ;
}
if (logdev && logdev != ddev) {
mp->m_logdev_targp = xfs_alloc_buftarg(logdev, 1, mp->m_fsname);
mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, 1,
mp->m_fsname);
if (!mp->m_logdev_targp)
goto out_free_rtdev_targ;
} else {