[dm-devel] multipath-tools libmultipath/config.c libmulti ...
bmarzins at sourceware.org
bmarzins at sourceware.org
Wed Jul 11 23:03:37 UTC 2012
CVSROOT: /cvs/dm
Module name: multipath-tools
Branch: RHEL5_FC6
Changes by: bmarzins at sourceware.org 2012-07-11 23:03:35
Modified files:
libmultipath : config.c config.h dict.c hwtable.c propsel.c
structs.h
multipathd : cli.c cli.h cli_handlers.c cli_handlers.h
main.c multipathd.init.redhat
path_priority/pp_alua: mpath_prio_alua.8
Log message:
Fix for bzs #644989, #799847, #833193, and #744231
Backport RHEL6 config changes.
Yet another fix to the ramfs.
Fixup mpath_prio_alua man page
Not applicable upstream
Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/multipath-tools/libmultipath/config.c.diff?cvsroot=dm&only_with_tag=RHEL5_FC6&r1=1.19.2.11&r2=1.19.2.12
http://sourceware.org/cgi-bin/cvsweb.cgi/multipath-tools/libmultipath/config.h.diff?cvsroot=dm&only_with_tag=RHEL5_FC6&r1=1.18.2.17&r2=1.18.2.18
http://sourceware.org/cgi-bin/cvsweb.cgi/multipath-tools/libmultipath/dict.c.diff?cvsroot=dm&only_with_tag=RHEL5_FC6&r1=1.17.2.22&r2=1.17.2.23
http://sourceware.org/cgi-bin/cvsweb.cgi/multipath-tools/libmultipath/hwtable.c.diff?cvsroot=dm&only_with_tag=RHEL5_FC6&r1=1.20.2.38&r2=1.20.2.39
http://sourceware.org/cgi-bin/cvsweb.cgi/multipath-tools/libmultipath/propsel.c.diff?cvsroot=dm&only_with_tag=RHEL5_FC6&r1=1.11.2.7&r2=1.11.2.8
http://sourceware.org/cgi-bin/cvsweb.cgi/multipath-tools/libmultipath/structs.h.diff?cvsroot=dm&only_with_tag=RHEL5_FC6&r1=1.18.2.10&r2=1.18.2.11
http://sourceware.org/cgi-bin/cvsweb.cgi/multipath-tools/multipathd/cli.c.diff?cvsroot=dm&only_with_tag=RHEL5_FC6&r1=1.5.2.4&r2=1.5.2.5
http://sourceware.org/cgi-bin/cvsweb.cgi/multipath-tools/multipathd/cli.h.diff?cvsroot=dm&only_with_tag=RHEL5_FC6&r1=1.5.2.3&r2=1.5.2.4
http://sourceware.org/cgi-bin/cvsweb.cgi/multipath-tools/multipathd/cli_handlers.c.diff?cvsroot=dm&only_with_tag=RHEL5_FC6&r1=1.6.2.4&r2=1.6.2.5
http://sourceware.org/cgi-bin/cvsweb.cgi/multipath-tools/multipathd/cli_handlers.h.diff?cvsroot=dm&only_with_tag=RHEL5_FC6&r1=1.3.2.3&r2=1.3.2.4
http://sourceware.org/cgi-bin/cvsweb.cgi/multipath-tools/multipathd/main.c.diff?cvsroot=dm&only_with_tag=RHEL5_FC6&r1=1.69.2.41&r2=1.69.2.42
http://sourceware.org/cgi-bin/cvsweb.cgi/multipath-tools/multipathd/multipathd.init.redhat.diff?cvsroot=dm&only_with_tag=RHEL5_FC6&r1=1.2.4.6&r2=1.2.4.7
http://sourceware.org/cgi-bin/cvsweb.cgi/multipath-tools/path_priority/pp_alua/mpath_prio_alua.8.diff?cvsroot=dm&only_with_tag=RHEL5_FC6&r1=1.2&r2=1.2.2.1
--- multipath-tools/libmultipath/config.c 2011/10/27 21:36:19 1.19.2.11
+++ multipath-tools/libmultipath/config.c 2012/07/11 23:03:34 1.19.2.12
@@ -332,6 +332,11 @@
hwe->no_path_retry = dhwe->no_path_retry;
hwe->minio = dhwe->minio;
hwe->checker = dhwe->checker;
+ hwe->pg_timeout = dhwe->pg_timeout;
+ hwe->flush_on_last_del = dhwe->flush_on_last_del;
+ hwe->fast_io_fail = dhwe->fast_io_fail;
+ hwe->dev_loss = dhwe->dev_loss;
+ hwe->user_friendly_names = dhwe->user_friendly_names;
if (dhwe->bl_product && !(hwe->bl_product = set_param_str(dhwe->bl_product)))
goto out;
@@ -415,7 +420,7 @@
conf->dev_type = DEV_NONE;
conf->minio = 1000;
- conf->max_fds = 0;
+ conf->max_fds = MAX_FDS_MAX;
conf->attribute_flags = 0;
conf->flush_on_last_del = 0;
conf->file_timeout = DEFAULT_FILE_TIMEOUT;
--- multipath-tools/libmultipath/config.h 2012/06/14 21:56:47 1.18.2.17
+++ multipath-tools/libmultipath/config.h 2012/07/11 23:03:34 1.18.2.18
@@ -32,6 +32,7 @@
int flush_on_last_del;
int fast_io_fail;
unsigned int dev_loss;
+ int user_friendly_names;
struct checker * checker;
char * bl_product;
};
@@ -51,6 +52,7 @@
int pg_timeout;
int attribute_flags;
int flush_on_last_del;
+ int user_friendly_names;
uid_t uid;
gid_t gid;
mode_t mode;
--- multipath-tools/libmultipath/dict.c 2011/10/27 21:36:20 1.17.2.22
+++ multipath-tools/libmultipath/dict.c 2012/07/11 23:03:34 1.17.2.23
@@ -455,7 +455,7 @@
}
static int
-names_handler(vector strvec)
+def_names_handler(vector strvec)
{
char * buff;
@@ -466,10 +466,12 @@
if ((strlen(buff) == 2 && !strcmp(buff, "no")) ||
(strlen(buff) == 1 && !strcmp(buff, "0")))
- conf->user_friendly_names = 0;
+ conf->user_friendly_names = USER_FRIENDLY_NAMES_OFF;
else if ((strlen(buff) == 3 && !strcmp(buff, "yes")) ||
(strlen(buff) == 1 && !strcmp(buff, "1")))
- conf->user_friendly_names = 1;
+ conf->user_friendly_names = USER_FRIENDLY_NAMES_ON;
+ else
+ conf->user_friendly_names = USER_FRIENDLY_NAMES_UNDEF;
FREE(buff);
return 0;
@@ -1072,6 +1074,32 @@
return 0;
}
+static int
+hw_names_handler(vector strvec)
+{
+ struct hwentry *hwe = VECTOR_LAST_SLOT(conf->hwtable);
+ char * buff;
+
+ if (!hwe)
+ return 1;
+
+ buff = set_value(strvec);
+ if (!buff)
+ return 1;
+
+ if ((strlen(buff) == 2 && strcmp(buff, "no") == 0) ||
+ (strlen(buff) == 1 && strcmp(buff, "0") == 0))
+ hwe->user_friendly_names = USER_FRIENDLY_NAMES_OFF;
+ else if ((strlen(buff) == 3 && strcmp(buff, "yes") == 0) ||
+ (strlen(buff) == 1 && strcmp(buff, "1") == 0))
+ hwe->user_friendly_names = USER_FRIENDLY_NAMES_ON;
+ else
+ hwe->user_friendly_names = USER_FRIENDLY_NAMES_UNDEF;
+
+ FREE(buff);
+ return 0;
+}
+
/*
* multipaths block handlers
*/
@@ -1426,6 +1454,32 @@
return 0;
}
+static int
+mp_names_handler(vector strvec)
+{
+ struct mpentry *mpe = VECTOR_LAST_SLOT(conf->mptable);
+ char * buff;
+
+ if (!mpe)
+ return 1;
+
+ buff = set_value(strvec);
+ if (!buff)
+ return 1;
+
+ if ((strlen(buff) == 2 && strcmp(buff, "no") == 0) ||
+ (strlen(buff) == 1 && strcmp(buff, "0") == 0))
+ mpe->user_friendly_names = USER_FRIENDLY_NAMES_OFF;
+ else if ((strlen(buff) == 3 && strcmp(buff, "yes") == 0) ||
+ (strlen(buff) == 1 && strcmp(buff, "1") == 0))
+ mpe->user_friendly_names = USER_FRIENDLY_NAMES_ON;
+ else
+ mpe->user_friendly_names = USER_FRIENDLY_NAMES_UNDEF;
+
+ FREE(buff);
+ return 0;
+}
+
/*
* config file keywords printing
*/
@@ -1613,6 +1667,19 @@
}
static int
+snprint_mp_user_friendly_names (char * buff, int len, void * data)
+{
+ struct mpentry * mpe = (struct mpentry *)data;
+
+ if (mpe->user_friendly_names == USER_FRIENDLY_NAMES_UNDEF)
+ return 0;
+ else if (mpe->user_friendly_names == USER_FRIENDLY_NAMES_OFF)
+ return snprintf(buff, len, "no");
+ else
+ return snprintf(buff, len, "yes");
+}
+
+static int
snprint_hw_fast_io_fail(char * buff, int len, void * data)
{
struct hwentry * hwe = (struct hwentry *)data;
@@ -1851,6 +1918,19 @@
}
static int
+snprint_hw_user_friendly_names (char * buff, int len, void * data)
+{
+ struct hwentry * hwe = (struct hwentry *)data;
+
+ if (hwe->user_friendly_names == USER_FRIENDLY_NAMES_UNDEF)
+ return 0;
+ else if (hwe->user_friendly_names == USER_FRIENDLY_NAMES_OFF)
+ return snprintf(buff, len, "no");
+ else
+ return snprintf(buff, len, "yes");
+}
+
+static int
snprint_def_polling_interval (char * buff, int len, void * data)
{
return snprintf(buff, len, "%i", conf->checkint);
@@ -2053,10 +2133,12 @@
{
switch (conf->queue_without_daemon) {
case QUE_NO_DAEMON_OFF:
- return snprintf(buff, len, "no");
case QUE_NO_DAEMON_UNDEF:
+ return snprintf(buff, len, "no");
case QUE_NO_DAEMON_ON:
return snprintf(buff, len, "yes");
+ case QUE_NO_DAEMON_FORCE:
+ return snprintf(buff, len, "forced");
}
return 0;
}
@@ -2103,10 +2185,10 @@
static int
snprint_def_user_friendly_names (char * buff, int len, void * data)
{
- if (!conf->user_friendly_names)
+ if (conf->user_friendly_names == USER_FRIENDLY_NAMES_ON)
+ return snprintf(buff, len, "yes");
+ else
return snprintf(buff, len, "no");
-
- return snprintf(buff, len, "yes");
}
static int
@@ -2194,7 +2276,7 @@
install_keyword("flush_on_last_del", &def_flush_on_last_del_handler, &snprint_def_flush_on_last_del);
install_keyword("checker_timeout", &def_checker_timeout_handler, &snprint_def_checker_timeout);
install_keyword("pg_timeout", &def_pg_timeout_handler, &snprint_def_pg_timeout);
- install_keyword("user_friendly_names", &names_handler, &snprint_def_user_friendly_names);
+ install_keyword("user_friendly_names", &def_names_handler, &snprint_def_user_friendly_names);
install_keyword("pg_prio_calc", &def_pg_prio_calc_handler, &snprint_def_pg_prio_calc);
install_keyword("log_checker_err", &def_log_checker_err_handler, &snprint_def_log_checker_err);
install_keyword("bindings_file", &bindings_file_handler, &snprint_def_bindings_file);
@@ -2261,6 +2343,7 @@
install_keyword("pg_timeout", &hw_pg_timeout_handler, &snprint_hw_pg_timeout);
install_keyword("fast_io_fail_tmo", &hw_fast_io_fail_handler, &snprint_hw_fast_io_fail);
install_keyword("dev_loss_tmo", &hw_dev_loss_handler, &snprint_hw_dev_loss);
+ install_keyword("user_friendly_names", &hw_names_handler, &snprint_hw_user_friendly_names);
install_sublevel_end();
install_keyword_root("multipaths", &multipaths_handler);
@@ -2280,5 +2363,6 @@
install_keyword("mode", &mp_mode_handler, &snprint_mp_mode);
install_keyword("uid", &mp_uid_handler, &snprint_mp_uid);
install_keyword("gid", &mp_gid_handler, &snprint_mp_gid);
+ install_keyword("user_friendly_names", &mp_names_handler, &snprint_mp_user_friendly_names);
install_sublevel_end();
}
--- multipath-tools/libmultipath/hwtable.c 2012/06/14 21:56:47 1.20.2.38
+++ multipath-tools/libmultipath/hwtable.c 2012/07/11 23:03:34 1.20.2.39
@@ -716,7 +716,7 @@
.product = "LUN.*",
.getuid = DEFAULT_GETUID,
.getprio = "/sbin/mpath_prio_ontap /dev/%n",
- .features = "1 queue_if_no_path",
+ .features = "3 queue_if_no_path pg_init_retries 50",
.hwhandler = DEFAULT_HWHANDLER,
.selector = DEFAULT_SELECTOR,
.pgpolicy = GROUP_BY_PRIO,
@@ -724,7 +724,7 @@
.rr_weight = RR_WEIGHT_NONE,
.no_path_retry = NO_PATH_RETRY_UNDEF,
.minio = 128,
- .checker_name = DIRECTIO,
+ .checker_name = TUR,
},
/*
* IBM NSeries (NETAPP) controller family
--- multipath-tools/libmultipath/propsel.c 2012/06/14 21:56:47 1.11.2.7
+++ multipath-tools/libmultipath/propsel.c 2012/07/11 23:03:34 1.11.2.8
@@ -156,6 +156,18 @@
return 0;
}
+static int
+want_user_friendly_names(struct multipath * mp)
+{
+ if (mp->mpe &&
+ mp->mpe->user_friendly_names != USER_FRIENDLY_NAMES_UNDEF)
+ return (mp->mpe->user_friendly_names == USER_FRIENDLY_NAMES_ON);
+ if (mp->hwe &&
+ mp->hwe->user_friendly_names != USER_FRIENDLY_NAMES_UNDEF)
+ return (mp->hwe->user_friendly_names == USER_FRIENDLY_NAMES_ON);
+ return (conf->user_friendly_names == USER_FRIENDLY_NAMES_ON);
+}
+
extern int
select_alias (struct multipath * mp)
{
@@ -163,7 +175,7 @@
mp->alias = mp->mpe->alias;
else {
mp->alias = NULL;
- if (conf->user_friendly_names)
+ if (want_user_friendly_names(mp))
mp->alias = get_user_friendly_alias(mp->wwid,
conf->bindings_file,
conf->bindings_read_only);
--- multipath-tools/libmultipath/structs.h 2011/10/10 03:03:17 1.18.2.10
+++ multipath-tools/libmultipath/structs.h 2012/07/11 23:03:34 1.18.2.11
@@ -82,6 +82,7 @@
QUE_NO_DAEMON_UNDEF,
QUE_NO_DAEMON_OFF,
QUE_NO_DAEMON_ON,
+ QUE_NO_DAEMON_FORCE,
};
enum pg_prio_calc_states {
@@ -94,6 +95,12 @@
LOG_CHKR_ERR_ONCE,
};
+enum user_friendly_names_states {
+ USER_FRIENDLY_NAMES_UNDEF,
+ USER_FRIENDLY_NAMES_OFF,
+ USER_FRIENDLY_NAMES_ON,
+};
+
struct scsi_idlun {
int dev_id;
int host_unique_id;
--- multipath-tools/multipathd/cli.c 2009/05/06 17:26:44 1.5.2.4
+++ multipath-tools/multipathd/cli.c 2012/07/11 23:03:34 1.5.2.5
@@ -129,6 +129,7 @@
r += add_key(keys, "resume", RESUME, 0);
r += add_key(keys, "reinstate", REINSTATE, 0);
r += add_key(keys, "fail", FAIL, 0);
+ r += add_key(keys, "forcequeueing", FORCEQ, 0);
r += add_key(keys, "disablequeueing", DISABLEQ, 0);
r += add_key(keys, "restorequeueing", RESTOREQ, 0);
r += add_key(keys, "resize", RESIZE, 0);
@@ -140,6 +141,7 @@
r += add_key(keys, "multipath", MAP, 1);
r += add_key(keys, "group", GROUP, 1);
r += add_key(keys, "reconfigure", RECONFIGURE, 0);
+ r += add_key(keys, "daemon", MPATH_DAEMON, 0);
r += add_key(keys, "status", STATUS, 0);
r += add_key(keys, "stats", STATS, 0);
r += add_key(keys, "topology", TOPOLOGY, 0);
--- multipath-tools/multipathd/cli.h 2008/09/19 03:27:08 1.5.2.3
+++ multipath-tools/multipathd/cli.h 2012/07/11 23:03:34 1.5.2.4
@@ -7,6 +7,7 @@
__RESUME,
__REINSTATE,
__FAIL,
+ __FORCEQ,
__DISABLEQ,
__RESTOREQ,
__RESIZE,
@@ -16,6 +17,7 @@
__MAP,
__GROUP,
__RECONFIGURE,
+ __MPATH_DAEMON,
__STATUS,
__STATS,
__TOPOLOGY,
@@ -32,6 +34,7 @@
#define RESUME (1 << __RESUME)
#define REINSTATE (1 << __REINSTATE)
#define FAIL (1 << __FAIL)
+#define FORCEQ (1 << __FORCEQ)
#define DISABLEQ (1 << __DISABLEQ)
#define RESTOREQ (1 << __RESTOREQ)
#define RESIZE (1 << __RESIZE)
@@ -41,6 +44,7 @@
#define MAP (1 << __MAP)
#define GROUP (1 << __GROUP)
#define RECONFIGURE (1 << __RECONFIGURE)
+#define MPATH_DAEMON (1 << __MPATH_DAEMON)
#define STATUS (1 << __STATUS)
#define STATS (1 << __STATS)
#define TOPOLOGY (1 << __TOPOLOGY)
--- multipath-tools/multipathd/cli_handlers.c 2008/09/19 04:00:21 1.6.2.4
+++ multipath-tools/multipathd/cli_handlers.c 2012/07/11 23:03:34 1.6.2.5
@@ -338,6 +338,25 @@
}
int
+cli_force_no_daemon_q(void * v, char ** reply, int * len, void * data)
+{
+ condlog(2, "force queue_without_daemon (operator)");
+ if (conf->queue_without_daemon == QUE_NO_DAEMON_OFF ||
+ conf->queue_without_daemon == QUE_NO_DAEMON_UNDEF)
+ conf->queue_without_daemon = QUE_NO_DAEMON_FORCE;
+ return 0;
+}
+
+int
+cli_restore_no_daemon_q(void * v, char ** reply, int * len, void * data)
+{
+ condlog(2, "restore queue_without_daemon (operator)");
+ if (conf->queue_without_daemon == QUE_NO_DAEMON_FORCE)
+ conf->queue_without_daemon = QUE_NO_DAEMON_OFF;
+ return 0;
+}
+
+int
cli_restore_queueing(void *v, char **reply, int *len, void *data)
{
struct vectors * vecs = (struct vectors *)data;
--- multipath-tools/multipathd/cli_handlers.h 2008/09/19 03:27:08 1.3.2.3
+++ multipath-tools/multipathd/cli_handlers.h 2012/07/11 23:03:34 1.3.2.4
@@ -15,6 +15,8 @@
int cli_reconfigure(void * v, char ** reply, int * len, void * data);
int cli_disable_queueing(void * v, char ** reply, int * len, void * data);
int cli_disable_all_queueing(void * v, char ** reply, int * len, void * data);
+int cli_force_no_daemon_q(void * v, char ** reply, int * len, void * data);
+int cli_restore_no_daemon_q(void * v, char ** reply, int * len, void * data);
int cli_restore_queueing(void * v, char ** reply, int * len, void * data);
int cli_restore_all_queueing(void * v, char ** reply, int * len, void * data);
int cli_resize(void * v, char ** reply, int * len, void * data);
--- multipath-tools/multipathd/main.c 2012/06/14 21:56:47 1.69.2.41
+++ multipath-tools/multipathd/main.c 2012/07/11 23:03:34 1.69.2.42
@@ -790,6 +790,8 @@
add_handler(RESUME+MAP, cli_resume);
add_handler(REINSTATE+PATH, cli_reinstate);
add_handler(FAIL+PATH, cli_fail);
+ add_handler(FORCEQ+MPATH_DAEMON, cli_force_no_daemon_q);
+ add_handler(RESTOREQ+MPATH_DAEMON, cli_restore_no_daemon_q);
add_handler(DISABLEQ+MAP, cli_disable_queueing);
add_handler(RESTOREQ+MAP, cli_restore_queueing);
add_handler(DISABLEQ+MAPS, cli_disable_all_queueing);
@@ -1423,7 +1425,8 @@
strcmp(mnt, "/usr") == 0 || strncmp(mnt, "/usr/lib", 8) == 0 ||
strcmp(mnt, "/etc") == 0 || strncmp(mnt, "/proc", 5) == 0 ||
strncmp(mnt, "/dev", 4) == 0 || strncmp(mnt, "/sys", 4) == 0 ||
- strcmp(mnt, "/var") == 0 || strncmp(mnt, "/var/lib", 8) == 0 ||
+ strcmp(mnt, "/var") == 0 || strcmp(mnt, "/var/lib") == 0 ||
+ strcmp(mnt, "/var/lib/multipath") == 0 ||
strncmp(mnt, "/var/run", 8) == 0 || strncmp(mnt, "/lib", 4) == 0 ||
strncmp(mnt, "/lib64", 6) == 0 || strncmp(mnt, "/usr/lib64", 10) == 0 ||
strncmp(mnt, "/ram", 4) == 0)
@@ -1529,6 +1532,9 @@
free_strvec(conf->binvec);
conf->binvec = NULL;
+ if (unmount_extra_devs() < 0)
+ return -1;
+
/*
* bind the ramfs to :
* /sbin : default home of multipath ...
@@ -1550,8 +1556,6 @@
return -1;
}
condlog(4, "bind ramfs on /tmp");
- if (unmount_extra_devs() < 0)
- return -1;
return 0;
}
#endif
@@ -1784,7 +1788,8 @@
block_signal(SIGHUP, NULL);
lock(vecs->lock);
exitting = 1;
- if (conf->queue_without_daemon == QUE_NO_DAEMON_OFF)
+ if (conf->queue_without_daemon == QUE_NO_DAEMON_OFF ||
+ conf->queue_without_daemon == QUE_NO_DAEMON_UNDEF)
vector_foreach_slot(vecs->mpvec, mpp, i)
dm_queue_if_no_path(mpp->alias, 0);
remove_maps(vecs, stop_waiter_thread);
--- multipath-tools/multipathd/multipathd.init.redhat 2009/08/31 21:58:52 1.2.4.6
+++ multipath-tools/multipathd/multipathd.init.redhat 2012/07/11 23:03:34 1.2.4.7
@@ -70,14 +70,16 @@
echo
}
-stop() {
+check_root() {
root_dev=$(awk '{ if ($1 !~ /^[ \t]*#/ && $2 == "/") { print $1; }}' /etc/mtab)
dm_num=`dmsetup info -c --noheadings -o minor $root_dev 2> /dev/null`
if [ $? -eq 0 ]; then
root_dm_device="dm-$dm_num"
[ -d $syspath/$root_dm_device ] && teardown_slaves $syspath/$root_dm_device
fi
+}
+stop() {
echo -n $"Stopping $prog daemon: "
killproc $DAEMON
RETVAL=$?
@@ -85,7 +87,12 @@
echo
}
+force_queue_without_daemon() {
+ $DAEMON -k"forcequeueing daemon"
+}
+
restart() {
+ force_queue_without_daemon
stop
start
}
@@ -103,6 +110,7 @@
start
;;
stop)
+ check_root
stop
;;
reload)
--- multipath-tools/path_priority/pp_alua/mpath_prio_alua.8 2006/08/02 21:37:23 1.2
+++ multipath-tools/path_priority/pp_alua/mpath_prio_alua.8 2012/07/11 23:03:34 1.2.2.1
@@ -122,7 +122,7 @@
group_by_prio
.TP
.B prio_callout
-"/sbin/mpath_prio_alua -d/tmp %d"
+"/sbin/mpath_prio_alua /dev/%n"
.TP
.B features
"1 queue_if_no_path"
@@ -144,12 +144,6 @@
.RB "characters long (for " vendor ") and 16 characters long (for " product ")."
The strings have to be padded with blanks if necessary.
.IP \(bu
-If you are working with hotpluggable devices whose device nodes are created
-by udev you should use the %d flag in the
-.BR prio_callout " statement."
-This is because a short time elapses between the devices being available
-and udev creating the device nodes.
-.IP \(bu
If under certain circumstances your storage subsystem temporarily reports
.RB "failures on all paths, you should use the " features " statement showed"
in the example.
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