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xfs: add debug knob to slow down writeback for fun

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Add a new error injection knob so that we can arbitrarily slow down
writeback to test for race conditions and aberrant reclaim behavior if
the writeback mechanisms are slow to issue writeback.  This will enable
functional testing for the ifork sequence counters introduced in commit
745b3f76d1 ("xfs: maintain a sequence count for inode fork
manipulations").

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong
2022-11-28 17:24:35 -08:00
parent 7dd73802f9
commit c2beff99eb
6 changed files with 90 additions and 3 deletions
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16
fs/xfs/xfs_error.c
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@@ -60,6 +60,7 @@ static unsigned int xfs_errortag_random_default[] = {
XFS_RANDOM_LARP,
XFS_RANDOM_DA_LEAF_SPLIT,
XFS_RANDOM_ATTR_LEAF_TO_NODE,
XFS_RANDOM_WB_DELAY_MS,
};
struct xfs_errortag_attr {
@@ -175,6 +176,7 @@ XFS_ERRORTAG_ATTR_RW(ag_resv_fail, XFS_ERRTAG_AG_RESV_FAIL);
XFS_ERRORTAG_ATTR_RW(larp, XFS_ERRTAG_LARP);
XFS_ERRORTAG_ATTR_RW(da_leaf_split, XFS_ERRTAG_DA_LEAF_SPLIT);
XFS_ERRORTAG_ATTR_RW(attr_leaf_to_node, XFS_ERRTAG_ATTR_LEAF_TO_NODE);
XFS_ERRORTAG_ATTR_RW(wb_delay_ms, XFS_ERRTAG_WB_DELAY_MS);
static struct attribute *xfs_errortag_attrs[] = {
XFS_ERRORTAG_ATTR_LIST(noerror),
@@ -218,6 +220,7 @@ static struct attribute *xfs_errortag_attrs[] = {
XFS_ERRORTAG_ATTR_LIST(larp),
XFS_ERRORTAG_ATTR_LIST(da_leaf_split),
XFS_ERRORTAG_ATTR_LIST(attr_leaf_to_node),
XFS_ERRORTAG_ATTR_LIST(wb_delay_ms),
NULL,
};
ATTRIBUTE_GROUPS(xfs_errortag);
@@ -267,6 +270,19 @@ xfs_errortag_valid(
return true;
}
bool
xfs_errortag_enabled(
struct xfs_mount *mp,
unsigned int tag)
{
if (!mp->m_errortag)
return false;
if (!xfs_errortag_valid(tag))
return false;
return mp->m_errortag[tag] != 0;
}
bool
xfs_errortag_test(
struct xfs_mount *mp,