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---
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libmultipath/configure.c | 2 -
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libmultipath/propsel.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++
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2 files changed, 59 insertions(+), 1 deletion(-)
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Index: multipath-tools-130222/libmultipath/configure.c
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===================================================================
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--- multipath-tools-130222.orig/libmultipath/configure.c
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+++ multipath-tools-130222/libmultipath/configure.c
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@@ -282,6 +282,7 @@ setup_map (struct multipath * mpp, char
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select_pgpolicy(mpp);
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select_selector(mpp);
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select_features(mpp);
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+ select_retain_hwhandler(mpp);
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select_hwhandler(mpp);
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select_rr_weight(mpp);
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select_minio(mpp);
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@@ -293,7 +294,6 @@ setup_map (struct multipath * mpp, char
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select_fast_io_fail(mpp);
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select_dev_loss(mpp);
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select_reservation_key(mpp);
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- select_retain_hwhandler(mpp);
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select_deferred_remove(mpp);
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select_delay_watch_checks(mpp);
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select_delay_wait_checks(mpp);
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Index: multipath-tools-130222/libmultipath/propsel.c
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===================================================================
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--- multipath-tools-130222.orig/libmultipath/propsel.c
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+++ multipath-tools-130222/libmultipath/propsel.c
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@@ -19,6 +19,8 @@
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#include "discovery.h"
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#include "prioritizers/alua_rtpg.h"
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#include "prkey.h"
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+#include "sysfs.h"
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+#include "util.h"
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#include <inttypes.h>
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#include <libudev.h>
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#include <mpath_persist.h>
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@@ -317,9 +319,65 @@ select_features (struct multipath * mp)
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return 0;
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}
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+static int get_dh_state(struct path *pp, char *value, size_t value_len)
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+{
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+ int ret;
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+ struct udev_device *ud;
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+
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+ if (pp->udev == NULL)
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+ return -1;
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+
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+ ud = udev_device_get_parent_with_subsystem_devtype(pp->udev, "scsi",
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+ "scsi_device");
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+ if (ud == NULL)
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+ return -1;
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+
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+ ret = sysfs_attr_get_value(ud, "dh_state", value, value_len);
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+ if (ret > 0)
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+ strchop(value);
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+ return ret;
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+}
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+
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+static int
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+use_attached_hwhandler(struct multipath * mp)
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+{
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+ int i;
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+ struct path *pp;
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+ int attached_hwhandler = 0;
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+ /* dh_state is no longer than "detached" */
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+ char dh_state[10];
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+
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+ vector_foreach_slot (mp->paths, pp, i) {
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+ if (get_dh_state(pp, dh_state, sizeof(dh_state)) > 0 &&
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+ strcmp(dh_state, "detached") != 0) {
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+ if (!attached_hwhandler) {
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+ if (asprintf(&mp->hwhandler, "1 %s",
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+ dh_state) < 0)
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+ return 0;
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+ attached_hwhandler = 1;
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+ /* if we find 2 different hardware handlers, disable
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+ * retain_attached_hw_handler, and use the configured
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+ * handler */
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+ } else if (strcmp(dh_state, &mp->hwhandler[2]) != 0) {
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+ FREE(mp->hwhandler);
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+ mp->hwhandler = NULL;
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+ mp->retain_hwhandler = RETAIN_HWHANDLER_OFF;
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+ condlog(0, "%s: retain_attached_hw_hander disabled (inconsistent handlers on paths)", mp->alias);
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+ return 0;
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+ }
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+ }
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+ }
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+ return attached_hwhandler;
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+}
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+
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extern int
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select_hwhandler (struct multipath * mp)
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{
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+ if (mp->retain_hwhandler == RETAIN_HWHANDLER_ON &&
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+ use_attached_hwhandler(mp)) {
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+ condlog(3, "%s: hwhandler = %s (setting: retained by kernel driver)", mp->alias, mp->hwhandler);
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+ return 0;
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+ }
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if (mp->hwe && mp->hwe->hwhandler) {
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mp->hwhandler = mp->hwe->hwhandler;
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condlog(3, "%s: hwhandler = %s (controller setting)",
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