178 lines
5.7 KiB
Diff
178 lines
5.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Benjamin Marzinski <bmarzins@redhat.com>
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Date: Fri, 7 Oct 2022 12:35:40 -0500
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Subject: [PATCH] libmultipath: fix queue_mode feature handling
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device-mapper is not able to change the queue_mode on a table reload.
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Make sure that when multipath sets up the map, both on regular reloads
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and reconfigures, it keeps the queue_mode the same.
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Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
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Reviewed-by: Martin Wilck <mwilck@suse.com>
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---
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libmultipath/configure.c | 4 +++
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libmultipath/dmparser.c | 2 ++
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libmultipath/propsel.c | 55 ++++++++++++++++++++++++++++++++++++++
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libmultipath/structs.h | 7 +++++
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multipath/multipath.conf.5 | 7 +++--
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5 files changed, 73 insertions(+), 2 deletions(-)
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diff --git a/libmultipath/configure.c b/libmultipath/configure.c
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index 70049f47..cc778a22 100644
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--- a/libmultipath/configure.c
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+++ b/libmultipath/configure.c
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@@ -1118,6 +1118,7 @@ int coalesce_paths (struct vectors *vecs, vector mpvec, char *refwwid,
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struct config *conf = NULL;
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int allow_queueing;
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struct bitfield *size_mismatch_seen;
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+ struct multipath * cmpp;
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/* ignore refwwid if it's empty */
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if (refwwid && !strlen(refwwid))
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@@ -1227,6 +1228,9 @@ int coalesce_paths (struct vectors *vecs, vector mpvec, char *refwwid,
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}
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verify_paths(mpp);
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+ cmpp = find_mp_by_wwid(curmp, mpp->wwid);
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+ if (cmpp)
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+ mpp->queue_mode = cmpp->queue_mode;
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if (setup_map(mpp, ¶ms, vecs)) {
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remove_map(mpp, vecs->pathvec, NULL);
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continue;
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diff --git a/libmultipath/dmparser.c b/libmultipath/dmparser.c
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index bc311421..16377c54 100644
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--- a/libmultipath/dmparser.c
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+++ b/libmultipath/dmparser.c
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@@ -152,6 +152,8 @@ int disassemble_map(const struct _vector *pathvec,
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FREE(word);
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}
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+ mpp->queue_mode = strstr(mpp->features, "queue_mode bio") ?
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+ QUEUE_MODE_BIO : QUEUE_MODE_RQ;
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/*
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* hwhandler
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diff --git a/libmultipath/propsel.c b/libmultipath/propsel.c
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index 2b47f5f8..9dea6f92 100644
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--- a/libmultipath/propsel.c
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+++ b/libmultipath/propsel.c
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@@ -27,6 +27,7 @@
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#include "strbuf.h"
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#include <inttypes.h>
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#include <libudev.h>
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+#include <ctype.h>
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pgpolicyfn *pgpolicies[] = {
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NULL,
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@@ -414,6 +415,59 @@ void reconcile_features_with_options(const char *id, char **features, int* no_pa
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}
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}
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+static void reconcile_features_with_queue_mode(struct multipath *mp)
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+{
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+ char *space = NULL, *val = NULL, *mode_str = NULL, *feat;
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+ int features_mode = QUEUE_MODE_UNDEF;
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+
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+ if (!mp->features)
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+ return;
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+
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+ pthread_cleanup_push(cleanup_free_ptr, &space);
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+ pthread_cleanup_push(cleanup_free_ptr, &val);
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+ pthread_cleanup_push(cleanup_free_ptr, &mode_str);
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+
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+ if (!(feat = strstr(mp->features, "queue_mode")) ||
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+ feat == mp->features || !isspace(*(feat - 1)) ||
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+ sscanf(feat, "queue_mode%m[ \f\n\r\t\v]%ms", &space, &val) != 2)
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+ goto sync_mode;
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+ if (asprintf(&mode_str, "queue_mode%s%s", space, val) < 0) {
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+ condlog(1, "failed to allocate space for queue_mode feature string");
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+ mode_str = NULL; /* value undefined on failure */
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+ goto exit;
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+ }
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+
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+ if (!strcmp(val, "rq") || !strcmp(val, "mq"))
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+ features_mode = QUEUE_MODE_RQ;
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+ else if (!strcmp(val, "bio"))
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+ features_mode = QUEUE_MODE_BIO;
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+ if (features_mode == QUEUE_MODE_UNDEF) {
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+ condlog(2, "%s: ignoring invalid feature '%s'",
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+ mp->alias, mode_str);
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+ goto sync_mode;
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+ }
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+
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+ if (mp->queue_mode == QUEUE_MODE_UNDEF)
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+ mp->queue_mode = features_mode;
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+ if (mp->queue_mode == features_mode)
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+ goto exit;
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+
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+ condlog(2,
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+ "%s: ignoring feature '%s' because queue_mode is set to '%s'",
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+ mp->alias, mode_str,
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+ (mp->queue_mode == QUEUE_MODE_RQ)? "rq" : "bio");
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+
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+sync_mode:
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+ if (mode_str)
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+ remove_feature(&mp->features, mode_str);
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+ if (mp->queue_mode == QUEUE_MODE_BIO)
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+ add_feature(&mp->features, "queue_mode bio");
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+exit:
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+ pthread_cleanup_pop(1);
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+ pthread_cleanup_pop(1);
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+ pthread_cleanup_pop(1);
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+}
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+
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int select_features(struct config *conf, struct multipath *mp)
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{
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const char *origin;
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@@ -429,6 +483,7 @@ out:
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reconcile_features_with_options(mp->alias, &mp->features,
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&mp->no_path_retry,
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&mp->retain_hwhandler);
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+ reconcile_features_with_queue_mode(mp);
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condlog(3, "%s: features = \"%s\" %s", mp->alias, mp->features, origin);
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return 0;
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}
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diff --git a/libmultipath/structs.h b/libmultipath/structs.h
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index 8a07d470..b4f75de0 100644
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--- a/libmultipath/structs.h
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+++ b/libmultipath/structs.h
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@@ -170,6 +170,12 @@ enum max_sectors_kb_states {
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MAX_SECTORS_KB_MIN = 4, /* can't be smaller than page size */
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};
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+enum queue_mode_states {
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+ QUEUE_MODE_UNDEF = 0,
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+ QUEUE_MODE_BIO,
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+ QUEUE_MODE_RQ,
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+};
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+
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enum scsi_protocol {
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SCSI_PROTOCOL_FCP = 0, /* Fibre Channel */
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SCSI_PROTOCOL_SPI = 1, /* parallel SCSI */
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@@ -387,6 +393,7 @@ struct multipath {
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int needs_paths_uevent;
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int ghost_delay;
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int ghost_delay_tick;
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+ int queue_mode;
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uid_t uid;
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gid_t gid;
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mode_t mode;
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diff --git a/multipath/multipath.conf.5 b/multipath/multipath.conf.5
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index f7de5140..e1a787d4 100644
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--- a/multipath/multipath.conf.5
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+++ b/multipath/multipath.conf.5
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@@ -468,8 +468,11 @@ precedence. See KNOWN ISSUES.
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<mode> can be \fIbio\fR, \fIrq\fR or \fImq\fR, which corresponds to
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bio-based, request-based, and block-multiqueue (blk-mq) request-based,
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respectively.
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-The default depends on the kernel parameter \fBdm_mod.use_blk_mq\fR. It is
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-\fImq\fR if the latter is set, and \fIrq\fR otherwise.
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+Before kernel 4.20 The default depends on the kernel parameter
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+\fBdm_mod.use_blk_mq\fR. It is \fImq\fR if the latter is set, and \fIrq\fR
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+otherwise. Since kernel 4.20, \fIrq\fR and \fImq\fR both correspond to
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+block-multiqueue. Once a multipath device has been created, its queue_mode
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+cannot be changed.
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.TP
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The default is: \fB<unset>\fR
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.RE
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