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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Benjamin Marzinski <bmarzins@redhat.com>
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Date: Thu, 11 Apr 2019 13:25:42 -0500
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Subject: [PATCH] RH: attempt to get ANA info via sysfs first
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When the ANA prioritizer is run, first see if the "ana_state" sysfs file
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exists, and if it does, try to read the state from there. If that fails,
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fallback to using an ioctl.
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Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
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---
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libmultipath/prioritizers/ana.c | 31 +++++++++++++++++++++++++++++--
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1 file changed, 29 insertions(+), 2 deletions(-)
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diff --git a/libmultipath/prioritizers/ana.c b/libmultipath/prioritizers/ana.c
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index b5c7873d..e139360c 100644
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--- a/libmultipath/prioritizers/ana.c
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+++ b/libmultipath/prioritizers/ana.c
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@@ -24,6 +24,7 @@
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#include "prio.h"
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#include "util.h"
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#include "structs.h"
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+#include "sysfs.h"
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enum {
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ANA_ERR_GETCTRL_FAILED = 1,
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@@ -36,6 +37,7 @@ enum {
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ANA_ERR_GETNS_FAILED,
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ANA_ERR_NO_MEMORY,
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ANA_ERR_NO_INFORMATION,
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+ ANA_ERR_INVALID_STATE,
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};
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static const char *ana_errmsg[] = {
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@@ -49,6 +51,7 @@ static const char *ana_errmsg[] = {
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[ANA_ERR_GETNS_FAILED] = "couldn't get namespace info",
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[ANA_ERR_NO_MEMORY] = "out of memory",
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[ANA_ERR_NO_INFORMATION] = "invalid fd",
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+ [ANA_ERR_INVALID_STATE] = "invalid state",
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};
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static const char *anas_string[] = {
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@@ -107,6 +110,27 @@ static int get_ana_state(__u32 nsid, __u32 anagrpid, void *ana_log,
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return -ANA_ERR_GETANAS_NOTFOUND;
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}
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+static int get_ana_info_sysfs(struct path *pp)
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+{
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+ char state[32];
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+
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+ if (!pp->udev || sysfs_attr_get_value(pp->udev, "ana_state", state,
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+ sizeof(state)) <= 0)
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+ return -ANA_ERR_NO_INFORMATION;
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+
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+ if (strcmp(state, "optimized") == 0)
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+ return NVME_ANA_OPTIMIZED;
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+ if (strcmp(state, "non-optimized") == 0)
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+ return NVME_ANA_NONOPTIMIZED;
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+ if (strcmp(state, "inaccessible") == 0)
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+ return NVME_ANA_INACCESSIBLE;
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+ if (strcmp(state, "persistent-loss") == 0)
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+ return NVME_ANA_PERSISTENT_LOSS;
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+ if (strcmp(state, "change") == 0)
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+ return NVME_ANA_CHANGE;
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+ return -ANA_ERR_INVALID_STATE;
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+}
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+
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static int get_ana_info(struct path * pp)
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{
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int rc;
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@@ -210,8 +234,11 @@ int getprio(struct path *pp, __attribute__((unused)) char *args,
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if (pp->fd < 0)
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rc = -ANA_ERR_NO_INFORMATION;
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- else
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- rc = get_ana_info(pp);
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+ else {
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+ rc = get_ana_info_sysfs(pp);
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+ if (rc < 0)
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+ rc = get_ana_info(pp);
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+ }
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switch (rc) {
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case NVME_ANA_OPTIMIZED:
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