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From 2fc494b81157059e0be66022f6a2110f1ce179c3 Mon Sep 17 00:00:00 2001
From: Mike Christie <mchristi@redhat.com>
Date: Tue, 9 Aug 2016 13:44:10 -0500
Subject: [PATCH 02/11] libmultipath: add rbd discovery
For BZ 1348372 from upstream commit:
Commit 152f3f803ee922075e8b25027eb9dc5699f1aefa
Author: Mike Christie <mchristi@redhat.com>
Date: Mon Aug 8 07:01:47 2016 -0500
libmultipath: add rbd discovery
rbd is a block device interface for Ceph. It does not support
any SCSI commands, so this patch adds bus detection and virtual
vendor/product pathinfo.
--------
Porting notes:
get_uid() chunk does not match upstream due to rhel not having
the get uid callout code and sysfs uid detection code.
Signed-off-by: Mike Christie <mchristi@redhat.com>
---
libmultipath/checkers.h | 1 +
libmultipath/discovery.c | 116 ++++++++++++++++++++++++++++++++++++++++-------
libmultipath/structs.h | 1 +
3 files changed, 101 insertions(+), 17 deletions(-)
diff --git a/libmultipath/checkers.h b/libmultipath/checkers.h
index f6fe326..735bb25 100644
--- a/libmultipath/checkers.h
+++ b/libmultipath/checkers.h
@@ -75,6 +75,7 @@ enum path_check_state {
#define EMC_CLARIION "emc_clariion"
#define READSECTOR0 "readsector0"
#define CCISS_TUR "cciss_tur"
+#define RBD "rbd"
#define DEFAULT_CHECKER DIRECTIO
diff --git a/libmultipath/discovery.c b/libmultipath/discovery.c
index 7a8282b..1b9f390 100644
--- a/libmultipath/discovery.c
+++ b/libmultipath/discovery.c
@@ -781,6 +781,21 @@ scsi_sysfs_pathinfo (struct path * pp)
}
static int
+rbd_sysfs_pathinfo (struct path * pp)
+{
+ sprintf(pp->vendor_id, "Ceph");
+ sprintf(pp->product_id, "RBD");
+
+ condlog(3, "%s: vendor = %s product = %s", pp->dev, pp->vendor_id,
+ pp->product_id);
+ /*
+ * set the hwe configlet pointer
+ */
+ pp->hwe = find_hwe(conf->hwtable, pp->vendor_id, pp->product_id, NULL);
+ return 0;
+}
+
+static int
ccw_sysfs_pathinfo (struct path * pp)
{
struct udev_device *parent;
@@ -974,6 +989,8 @@ sysfs_pathinfo(struct path * pp)
pp->bus = SYSFS_BUS_CCW;
if (!strncmp(pp->dev,"sd", 2))
pp->bus = SYSFS_BUS_SCSI;
+ if (!strncmp(pp->dev,"rbd", 3))
+ pp->bus = SYSFS_BUS_RBD;
if (pp->bus == SYSFS_BUS_UNDEF)
return 0;
@@ -986,6 +1003,9 @@ sysfs_pathinfo(struct path * pp)
} else if (pp->bus == SYSFS_BUS_CCISS) {
if (cciss_sysfs_pathinfo(pp))
return 1;
+ } else if (pp->bus == SYSFS_BUS_RBD) {
+ if (rbd_sysfs_pathinfo(pp))
+ return 1;
}
return 0;
}
@@ -1087,10 +1107,60 @@ get_prio (struct path * pp)
}
static int
+get_rbd_uid(struct path * pp)
+{
+ struct udev_device *rbd_bus_dev;
+ int ret, rbd_bus_id;
+ const char *pool, *image, *snap;
+ char sysfs_path[PATH_SIZE];
+ uint64_t snap_id, max_snap_id = -3;
+
+ ret = sscanf(pp->dev, "rbd%d", &rbd_bus_id);
+ if (ret != 1)
+ return -EINVAL;
+
+ snprintf(sysfs_path, sizeof(sysfs_path), "/sys/bus/rbd/devices/%d",
+ rbd_bus_id);
+ rbd_bus_dev = udev_device_new_from_syspath(conf->udev, sysfs_path);
+ if (!rbd_bus_dev)
+ return -ENODEV;
+
+ ret = -EINVAL;
+ pool = udev_device_get_sysattr_value(rbd_bus_dev, "pool_id");
+ if (!pool)
+ goto free_dev;
+
+ image = udev_device_get_sysattr_value(rbd_bus_dev, "image_id");
+ if (!image)
+ goto free_dev;
+
+ snap = udev_device_get_sysattr_value(rbd_bus_dev, "snap_id");
+ if (!snap)
+ goto free_dev;
+ snap_id = strtoull(snap, NULL, 19);
+ if (snap_id >= max_snap_id)
+ ret = snprintf(pp->wwid, WWID_SIZE, "%s-%s", pool, image);
+ else
+ ret = snprintf(pp->wwid, WWID_SIZE, "%s-%s-%s", pool,
+ image, snap);
+ if (ret < WWID_SIZE) {
+ ret = 0;
+ } else {
+ condlog(0, "%s: wwid overflow", pp->dev);
+ ret = -EOVERFLOW;
+ }
+
+free_dev:
+ udev_device_unref(rbd_bus_dev);
+ return ret;
+}
+
+static int
get_uid (struct path * pp)
{
char *c;
const char *value;
+ int ret;
if (!pp->uid_attribute)
select_getuid(pp);
@@ -1101,25 +1171,37 @@ get_uid (struct path * pp)
}
memset(pp->wwid, 0, WWID_SIZE);
- value = udev_device_get_property_value(pp->udev, pp->uid_attribute);
- if ((!value || strlen(value) == 0) && conf->cmd == CMD_VALID_PATH)
- value = getenv(pp->uid_attribute);
- if (value && strlen(value)) {
- size_t len = WWID_SIZE;
-
- if (strlen(value) + 1 > WWID_SIZE) {
- condlog(0, "%s: wwid overflow", pp->dev);
- } else {
- len = strlen(value);
+ if (pp->bus == SYSFS_BUS_RBD) {
+ ret = get_rbd_uid(pp);
+ if (ret) {
+ condlog(1, "%s: failed to get sysfs uid: %s",
+ pp->dev, strerror(-ret));
+ pp->missing_udev_info = INFO_MISSING;
+ pp->tick = conf->retrigger_delay;
}
- strncpy(pp->wwid, value, len);
- pp->missing_udev_info = INFO_OK;
- pp->tick = 0;
} else {
- condlog(3, "%s: no %s attribute", pp->dev,
- pp->uid_attribute);
- pp->missing_udev_info = INFO_MISSING;
- pp->tick = conf->retrigger_delay;
+ value = udev_device_get_property_value(pp->udev,
+ pp->uid_attribute);
+ if ((!value || strlen(value) == 0) &&
+ conf->cmd == CMD_VALID_PATH)
+ value = getenv(pp->uid_attribute);
+ if (value && strlen(value)) {
+ size_t len = WWID_SIZE;
+
+ if (strlen(value) + 1 > WWID_SIZE) {
+ condlog(0, "%s: wwid overflow", pp->dev);
+ } else {
+ len = strlen(value);
+ }
+ strncpy(pp->wwid, value, len);
+ pp->missing_udev_info = INFO_OK;
+ pp->tick = 0;
+ } else {
+ condlog(3, "%s: no %s attribute", pp->dev,
+ pp->uid_attribute);
+ pp->missing_udev_info = INFO_MISSING;
+ pp->tick = conf->retrigger_delay;
+ }
}
/* Strip any trailing blanks */
diff --git a/libmultipath/structs.h b/libmultipath/structs.h
index b5b4567..e566462 100644
--- a/libmultipath/structs.h
+++ b/libmultipath/structs.h
@@ -52,6 +52,7 @@ enum sysfs_buses {
SYSFS_BUS_IDE,
SYSFS_BUS_CCW,
SYSFS_BUS_CCISS,
+ SYSFS_BUS_RBD,
};
enum pathstates {
--
1.8.3.1