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vdev_ops: don't try to call vdev_op_hold or vdev_op_rele when NULL

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This prevents a panic after a SLOG add/removal on the root pool followed
by a zpool scrub.

When a SLOG is removed, a hole takes its place - the vdev_ops for a hole
is vdev_hole_ops, which defines the handler functions of vdev_op_hold
and vdev_op_rele as NULL.

This bug has been reported in illumos and FreeBSD, a different trigger
in the FreeBSD report though.

Credit for this patch goes to Patrick Mooney <[email protected]>

Obtained from: illumos-gate commit: c65bd18728f34725
External-issue: https://www.illumos.org/issues/12981
External-issue: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252396
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Rob Wing <[email protected]>
Closes #11623
This commit is contained in:
fbynite authored and GitHub committed 2021-02-20 20:19:20 -08:00
1 parent 7e56b05058
commit 11f2e9a491
1 file changed
+2 -2
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module/zfs/vdev.c
+2 -2
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@@ -2527,7 +2527,7 @@ vdev_hold(vdev_t *vd)
for (int c = 0; c < vd->vdev_children; c++)
vdev_hold(vd->vdev_child[c]);
if (vd->vdev_ops->vdev_op_leaf)
if (vd->vdev_ops->vdev_op_leaf && vd->vdev_ops->vdev_op_hold != NULL)
vd->vdev_ops->vdev_op_hold(vd);
}
@@ -2538,7 +2538,7 @@ vdev_rele(vdev_t *vd)
for (int c = 0; c < vd->vdev_children; c++)
vdev_rele(vd->vdev_child[c]);
if (vd->vdev_ops->vdev_op_leaf)
if (vd->vdev_ops->vdev_op_leaf && vd->vdev_ops->vdev_op_rele != NULL)
vd->vdev_ops->vdev_op_rele(vd);
}