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xfs: allow scrubbers to pause background reclaim

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The forthcoming summary counter patch races with regular filesystem
activity to compute rough expected values for the counters.  This design
was chosen to avoid having to freeze the entire filesystem to check the
counters, but while that's running we'd prefer to minimize background
reclamation activity to reduce the perturbations to the incore free
block count.  Therefore, provide a way for scrubbers to disable
background posteof and cowblock reclamation.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong
2019-04-25 18:26:23 -07:00
parent ed30dcbd90
commit 9a1f3049f4
4 changed files with 23 additions and 0 deletions
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18
fs/xfs/scrub/common.c
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@@ -894,3 +894,21 @@ xchk_ilock_inverted(
}
return -EDEADLOCK;
}
/* Pause background reaping of resources. */
void
xchk_stop_reaping(
struct xfs_scrub *sc)
{
sc->flags |= XCHK_REAPING_DISABLED;
xfs_stop_block_reaping(sc->mp);
}
/* Restart background reaping of resources. */
void
xchk_start_reaping(
struct xfs_scrub *sc)
{
xfs_start_block_reaping(sc->mp);
sc->flags &= ~XCHK_REAPING_DISABLED;
}