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xfs: superblock scrub should use short-lived buffers

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Secondary superblocks are rarely used, so create a helper to read a
given non-primary AG's superblock and ensure that it won't stick around
hogging memory.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong
2018-05-14 06:34:31 -07:00
parent 8389f3ffa2
commit 689e11c84b
4 changed files with 27 additions and 3 deletions
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4
fs/xfs/scrub/agheader.c
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@@ -157,9 +157,7 @@ xfs_scrub_superblock(
if (agno == 0)
return 0;
error = xfs_trans_read_buf(mp, sc->tp, mp->m_ddev_targp,
XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
XFS_FSS_TO_BB(mp, 1), 0, &bp, &xfs_sb_buf_ops);
error = xfs_sb_read_secondary(mp, sc->tp, agno, &bp);
/*
* The superblock verifier can return several different error codes
* if it thinks the superblock doesn't look right. For a mount these