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xfs: use unhashed buffers for size checks

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When we are checking we can access the last block of each device, we
do not need to use cached buffers as they will be tossed away
immediately. Use uncached buffers for size checks so that all IO
prior to full in-memory structure initialisation does not use the
buffer cache.

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 26af655233
commit 1922c949c5
3 changed files with 34 additions and 45 deletions
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11
fs/xfs/xfs_fsops.c
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@ -144,12 +144,11 @@ xfs_growfs_data_private(
if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
return error;
dpct = pct - mp->m_sb.sb_imax_pct;
error = xfs_read_buf(mp, mp->m_ddev_targp,
XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
XFS_FSS_TO_BB(mp, 1), 0, &bp);
if (error)
return error;
ASSERT(bp);
bp = xfs_buf_read_uncached(mp, mp->m_ddev_targp,
XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
BBTOB(XFS_FSS_TO_BB(mp, 1)), 0);
if (!bp)
return EIO;
xfs_buf_relse(bp);
new = nb; /* use new as a temporary here */