[dm-devel] [PATCH]RE: multipath-tools : A way needless to restart multipathd damon while attaching new device to host which met a path failure
Gechangwei
ge.changwei at h3c.com
Sun May 29 06:13:08 UTC 2016
Hi Ben,
It is inconvenient to add blacklist exception to conf without restart multipath service or perform reconfigure command.
Suffering storage path failure, either performing reconfigure or restarting multipathd daemon will flush the map with path failure.
With this patch, blacklist exception will be added dynamically without restarting multipathd daemon, hence, no map will be flushed.
I am looking forward for your comments
Thanks.
Br.
Date: Tue, 17 May 2016 14:13:25 +0800
Subject: [PATCH] Dynamic blacklist exception addition
Signed-off-by: gechangwei <ge.changwei at h3c.com>
---
multipath-tools-0.5.0/libmultipath/structs.c | 19 +++
multipath-tools-0.5.0/libmultipath/structs.h | 1 +
multipath-tools-0.5.0/multipathd/cli.c | 8 +
multipath-tools-0.5.0/multipathd/cli.h | 10 +-
multipath-tools-0.5.0/multipathd/cli_handlers.c | 195 ++++++++++++++++++++++++
multipath-tools-0.5.0/multipathd/cli_handlers.h | 5 +
multipath-tools-0.5.0/multipathd/main.c | 4 +
7 files changed, 241 insertions(+), 1 deletion(-)
diff --git a/multipath-tools-0.5.0/libmultipath/structs.c b/multipath-tools-0.5.0/libmultipath/structs.c
index 0538327..6d3235a 100644
--- a/multipath-tools-0.5.0/libmultipath/structs.c
+++ b/multipath-tools-0.5.0/libmultipath/structs.c
@@ -424,6 +424,25 @@ find_path_by_devt (vector pathvec, char * dev_t)
return NULL;
}
+struct blentry *
+find_wwid_in_elist (vector wwid_vector, char * wwid)
+{
+ int i;
+ struct blentry *ele = NULL;
+
+ if (!wwid_vector) {
+ condlog(0, "wwid vector is NULL while finding wwid");
+ return NULL;
+ }
+
+ vector_foreach_slot (wwid_vector, ele, i)
+ if (!strncmp(ele->str, wwid, WWID_SIZE))
+ return ele;
+
+ condlog(3, "not found in wwid vecotr");
+ return NULL;
+}
+
extern int
pathcountgr (struct pathgroup * pgp, int state)
{
diff --git a/multipath-tools-0.5.0/libmultipath/structs.h b/multipath-tools-0.5.0/libmultipath/structs.h
index ab7dc25..75a39cd 100644
--- a/multipath-tools-0.5.0/libmultipath/structs.h
+++ b/multipath-tools-0.5.0/libmultipath/structs.h
@@ -332,6 +332,7 @@ struct multipath * find_mp_by_minor (vector mp, int minor);
struct path * find_path_by_devt (vector pathvec, char * devt);
struct path * find_path_by_dev (vector pathvec, char * dev);
struct path * first_path (struct multipath * mpp);
+struct blentry * find_wwid_in_elist (vector wwid_vector, char * wwid);
int pathcountgr (struct pathgroup *, int);
int pathcount (struct multipath *, int);
diff --git a/multipath-tools-0.5.0/multipathd/cli.c b/multipath-tools-0.5.0/multipathd/cli.c
index 6a5c6db..75389d7 100644
--- a/multipath-tools-0.5.0/multipathd/cli.c
+++ b/multipath-tools-0.5.0/multipathd/cli.c
@@ -188,6 +188,10 @@ load_keys (void)
r += add_key(keys, "getprstatus", GETPRSTATUS, 0);
r += add_key(keys, "setprstatus", SETPRSTATUS, 0);
r += add_key(keys, "unsetprstatus", UNSETPRSTATUS, 0);
+ r += add_key(keys, "elist", ELIST, 1);
+ r += add_key(keys, "discover", DISCOVER, 0);
+ r += add_key(keys, "newpath", NEWPATH, 0);
+ r += add_key(keys, "mappath", MAPPATH, 1);
r += add_key(keys, "format", FMT, 1);
if (r) {
@@ -504,6 +508,10 @@ cli_init (void) {
add_handler(UNSETPRSTATUS+MAP, NULL);
add_handler(FORCEQ+DAEMON, NULL);
add_handler(RESTOREQ+DAEMON, NULL);
+ add_handler(ADD+ELIST, NULL);
+ add_handler(DEL+ELIST, NULL);
+ add_handler(DISCOVER+NEWPATH, NULL);
+ add_handler(DEL+MAPPATH, NULL);
return 0;
}
diff --git a/multipath-tools-0.5.0/multipathd/cli.h b/multipath-tools-0.5.0/multipathd/cli.h
index f6d2726..6a0ffd8 100644
--- a/multipath-tools-0.5.0/multipathd/cli.h
+++ b/multipath-tools-0.5.0/multipathd/cli.h
@@ -33,6 +33,10 @@ enum {
__GETPRSTATUS,
__SETPRSTATUS,
__UNSETPRSTATUS,
+ __ELIST,
+ __DISCOVER,
+ __NEWPATH,
+ __MAPPATH,
__FMT,
};
@@ -71,7 +75,11 @@ enum {
#define GETPRSTATUS (1UL << __GETPRSTATUS)
#define SETPRSTATUS (1UL << __SETPRSTATUS)
#define UNSETPRSTATUS (1UL << __UNSETPRSTATUS)
-#define FMT (1UL << __FMT)
+#define ELIST (1UL << __ELIST)
+#define DISCOVER (1UL << __DISCOVER)
+#define NEWPATH (1UL << __NEWPATH)
+#define MAPPATH (1UL << __MAPPATH)
+#define FMT (1UL << __FMT)
#define INITIAL_REPLY_LEN 1200
diff --git a/multipath-tools-0.5.0/multipathd/cli_handlers.c b/multipath-tools-0.5.0/multipathd/cli_handlers.c
index 3d39acf..26d0a77 100644
--- a/multipath-tools-0.5.0/multipathd/cli_handlers.c
+++ b/multipath-tools-0.5.0/multipathd/cli_handlers.c
@@ -516,6 +516,110 @@ cli_del_path (void * v, char ** reply, int * len, void * data)
return ev_remove_path(pp, vecs);
}
+int
+cli_add_elist(void * v, char ** reply, int * len, void * data)
+{
+ char *param = get_keyparam(v, ELIST);
+ struct blentry *ble = NULL;
+ char *elist_wwid = NULL;
+
+ condlog(2, "%s: add elist (operator)", param);
+
+ if(find_wwid_in_elist(conf->elist_wwid, param)) {
+ condlog(0, "elist already contains wwid(%s)", param);
+ goto out;
+ }
+
+ elist_wwid = MALLOC(WWID_SIZE);
+ if (!elist_wwid) {
+ condlog(0, "malloc temporary wwid space failed.");
+ goto out;
+ }
+
+ strncpy(elist_wwid, param, WWID_SIZE);
+ elist_wwid[WWID_SIZE - 1] = '\0';
+
+ ble = MALLOC(sizeof(struct blentry));
+ if (!ble) {
+ condlog(0, "malloc black list exception entry failed.");
+ goto out;
+ }
+
+ if (regcomp(&ble->regex, param, REG_EXTENDED|REG_NOSUB))
+ goto out;
+
+ ble->origin = ORIGIN_CONFIG;
+ ble->str = elist_wwid;
+
+ if (!vector_alloc_slot(conf->elist_wwid)) {
+ condlog(0, "malloc black list exception entry failed.");
+ goto out;
+ }
+ vector_set_slot(conf->elist_wwid, ble);
+ return 0;;
+out:
+ *len = 0;
+ FREE(elist_wwid);
+ FREE(ble);
+ return 1;
+}
+
+int
+cli_del_elist(void * v, char ** reply, int * len, void * data)
+{
+ int i;
+ struct blentry *ble = NULL;
+ char *param = get_keyparam(v, ELIST);
+
+ *len = 0;
+
+ condlog(2, "%s: del elist (operator)", param);
+
+ vector_foreach_slot (conf->elist_wwid, ble, i) {
+ if (ble->str && !strncmp(ble->str, param, WWID_SIZE)) {
+ FREE(ble->str);
+ regfree(&ble->regex);
+ FREE(ble);
+ vector_del_slot(conf->elist_wwid, i);
+ i--;
+ return 0;
+ }
+ }
+
+ condlog(0, "specific wwid(%s) is not found!", param);
+ return 1;
+}
+
+int
+cli_discover_new_path(void * v, char ** reply, int * len, void * data)
+{
+ int ret = 0;
+ struct vectors *vecs = (struct vectors *)data;
+ vector pathvec = vecs->pathvec;
+
+ condlog(2, "discover new paths, this could update current paths' state (operator)");
+ if (path_discovery(pathvec, conf, DI_ALL) < 0) {
+ condlog(0, "discover new paths failed.");
+ ret = 1;
+ }
+
+ struct path *pp;
+ int i;
+
+ vector_foreach_slot(pathvec, pp, i) {
+ if(0 == pp->checkint) {
+ pp->checkint = conf->checkint;
+ condlog(2, "%s: device is found.", pp->dev);
+ }
+ }
+
+ *len = 0;
+ return ret;
+}
+
int
cli_add_map (void * v, char ** reply, int * len, void * data)
{
@@ -618,6 +722,97 @@ cli_del_map (void * v, char ** reply, int * len, void * data)
return rc;
}
+int
+cli_del_map_and_paths(void * v, char ** reply, int * len, void * data)
+{
+ int rc;
+ int ret = 1;
+ struct vectors *vecs = (struct vectors *)data;
+ char *param = get_keyparam(v, MAPPATH); /* SCSI ID */
+ char *refwwid = NULL;
+ char *wwid_tmp = NULL;
+ vector pathvec = NULL;
+ vector cmdvec = NULL;
+ struct key *kw = NULL;
+ char *dev_name = NULL;
+
+ condlog(2, "%s: del map and paths (operator)", param);
+ pathvec = vecs->pathvec;
+ if (pathvec == NULL)
+ goto out;
+
+ param = convert_dev(param, 0);
+ wwid_tmp = MALLOC(WWID_SIZE);
+ if(!wwid_tmp) {
+ condlog(0, "malloc temporary wwid space failed.");
+ goto out;
+ }
+
+ rc = get_refwwid(param, DEV_DEVMAP, pathvec, &refwwid);
+ if (rc) {
+ condlog(0, "get ref wwid of map(%s) failed.", param);
+ goto out;
+ }
+
+ condlog(3, "ref wwid(%s) is gotten.", refwwid);
+ strncpy(wwid_tmp, refwwid, WWID_SIZE);
+ wwid_tmp[WWID_SIZE - 1] = '\0';
+
+ /* prepare path deletion parameter vector */
+ /* this is triky since we fake a command vector */
+ cmdvec = vector_alloc();
+ dev_name = MALLOC(FILE_NAME_SIZE);
+ kw = (struct key *)MALLOC(sizeof(struct key));
+ if(NULL == cmdvec || NULL == dev_name || NULL == kw || !vector_alloc_slot(cmdvec)) {
+ condlog(0, "prepare command vector failed.");
+ goto out;
+ }
+ vector_set_slot(cmdvec, kw);
+
+ kw->code = MAP;
+ kw->has_param = 1;
+ kw->param = wwid_tmp;
+
+ rc = cli_del_map(cmdvec, NULL, NULL, data);
+ if(0 != rc) {
+ condlog(0, "del map(%s) faild before del all its paths", param);
+ goto out;
+ }
+
+ kw->code = PATH;
+ kw->has_param = 1;
+ kw->param = dev_name;
+
+ int i;
+ int del_ret = 0;
+ int del_ret_once = 0;
+ struct path *pp = NULL;
+
+ vector_foreach_slot(pathvec, pp, i) {
+ if(!strncmp(pp->wwid, wwid_tmp, WWID_SIZE)) {
+ condlog(2, "path(%s) of wwid(%s) found, try to remove it.", pp->dev, wwid_tmp);
+ strncpy(dev_name, pp->dev, FILE_NAME_SIZE);
+ if((del_ret_once = cli_del_path(cmdvec, NULL, NULL, data)) != 0)
+ condlog(0, "del path(%s) failed.", dev_name);
+ else
+ i--;
+ del_ret |= del_ret_once;
+ }
+ }
+ if(del_ret)
+ goto out;
+
+ ret = 0;
+out:
+ FREE(wwid_tmp);
+ FREE(dev_name);
+ vector_free(cmdvec);
+ FREE(kw);
+ *len = 0;
+ return ret;
+}
+
int
cli_reload(void *v, char **reply, int *len, void *data)
{
diff --git a/multipath-tools-0.5.0/multipathd/cli_handlers.h b/multipath-tools-0.5.0/multipathd/cli_handlers.h
index 799f8da..b44d528 100644
--- a/multipath-tools-0.5.0/multipathd/cli_handlers.h
+++ b/multipath-tools-0.5.0/multipathd/cli_handlers.h
@@ -39,4 +39,9 @@ int cli_reassign (void * v, char ** reply, int * len, void * data);
int cli_getprstatus(void * v, char ** reply, int * len, void * data);
int cli_setprstatus(void * v, char ** reply, int * len, void * data);
int cli_unsetprstatus(void * v, char ** reply, int * len, void * data);
+int cli_add_elist(void * v, char ** reply, int * len, void * data);
+int cli_del_elist(void * v, char ** reply, int * len, void * data);
+int cli_discover_new_path(void * v, char ** reply, int * len, void * data);
+int cli_del_map_and_paths(void * v, char ** reply, int * len, void * data);
+
diff --git a/multipath-tools-0.5.0/multipathd/main.c b/multipath-tools-0.5.0/multipathd/main.c
index 626f703..d27b95b 100644
--- a/multipath-tools-0.5.0/multipathd/main.c
+++ b/multipath-tools-0.5.0/multipathd/main.c
@@ -1013,6 +1013,10 @@ uxlsnrloop (void * ap)
set_handler_callback(UNSETPRSTATUS+MAP, cli_unsetprstatus);
set_handler_callback(FORCEQ+DAEMON, cli_force_no_daemon_q);
set_handler_callback(RESTOREQ+DAEMON, cli_restore_no_daemon_q);
+ set_handler_callback(ADD+ELIST, cli_add_elist);
+ set_handler_callback(DEL+ELIST, cli_del_elist);
+ set_handler_callback(DISCOVER+NEWPATH, cli_discover_new_path);
+ set_handler_callback(DEL+MAPPATH, cli_del_map_and_paths);
umask(077);
uxsock_listen(&uxsock_trigger, ap);
-----邮件原件-----
发件人: Benjamin Marzinski [mailto:bmarzins at redhat.com]
发送时间: 2016年5月26日 1:46
收件人: gechangwei 12382 (CCPL)
抄送: dm-devel at redhat.com; christophe.varoqui at gmail.com; zhongjinming 02800 (CCPL); guozhonghua 02084 (CCPL); shichangkuo 09727 (CCPL); zhangguanghui 10102 (CCPL)
主题: Re: multipath-tools : A way needless to restart multipathd damon while attaching new device to host which met a path failure
While having multipathd retain failed devices when it restarts may be a little tricky, since it won't know anything about those devices, having it retain these devices during a reload (which is enough to be able to change the configuration) should be doable. I agree that multipathd should not be removing devices if they haven't been removed from the system since, like you say, that will keep multipathd from reacting to the device's later recovery.
I'll take a look into doing this.
-Ben
On Mon, May 23, 2016 at 03:38:35AM +0000, Gechangwei wrote:
> Hi,
>
>
>
> I encountered an issue that devmapper disappeared while the multipathd
> dameon was restarted.
>
>
>
> Digging into the root cause of preceding issue, I found storage path
> failure while restarting the multipathd daemon. It seems unreasonable,
> because the storage path may recover in the future.
>
>
>
> When using multipath-tools to create device mapper, I configured
> “blacklist section” and “blacklist exception section”, which meets my
> requirement that only a small part of SCSI disk can be used underneath a
> device mapper.
>
>
>
> After restarting the multipathd daemon, the device mapper of path failure
> disappears and it won’t comeback even the storage paths recover. So the
> file system on that devmapper can’t be available.
>
>
>
> I wonder that if there is a solution that a device mapper of path failure
> can come back to active even I restart the multipathd daemon?
>
>
>
> If such a solution exists, it will be marvelous
>
>
>
> If not, I propose a userland interface to add blacklist exception
> dynamically. After the blacklist exception is added to “conf”, “multipathd
> add map $map” and “multipathd add path” can be used to add new map and
> path.
>
>
>
> In a nutshell, we can dynamically add elist, map and paths respectively.
> And multipathd damon is not necessary to restart due to preceding
> solution.
>
>
>
> Any experts of DM have any comments on my solution and the issue I faced
> with?
>
>
>
>
>
> Your reply is very important to me.
>
>
>
> Thanks.
>
>
>
> BR.
>
>
>
> Chauncey Ge
>
> -------------------------------------------------------------------------------------------------------------------------------------
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