From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Benjamin Marzinski Date: Wed, 15 Oct 2014 10:39:30 -0500 Subject: [PATCH] RH: don't start without a config file If /etc/multipath.conf doesn't exist, don't start multipathd and blacklist all devices when running multipath. A completely blank configuration file is almost never what users want. Also, people may have the multipath packages installed but don't want to use them. This patch provides a simple way to disable multipath. Simply removing or renaming /etc/multipath.conf will keep multipath from doing anything. Signed-off-by: Benjamin Marzinski --- libmultipath/config.c | 13 +++++++++++++ libmultipath/config.h | 1 + multipath/main.c | 6 ++++++ multipath/multipath.rules.in | 1 + multipathd/multipathd.8.in | 2 ++ multipathd/multipathd.service.in | 1 + multipathd/multipathd.socket | 1 + 7 files changed, 25 insertions(+) diff --git a/libmultipath/config.c b/libmultipath/config.c index 83fa7369..002027a7 100644 --- a/libmultipath/config.c +++ b/libmultipath/config.c @@ -959,6 +959,19 @@ int _init_config (const char *file, struct config *conf) } factorize_hwtable(conf->hwtable, builtin_hwtable_size, file); validate_pctable(conf->overrides, 0, file); + } else { + condlog(0, "/etc/multipath.conf does not exist, blacklisting all devices."); + if (conf->blist_devnode == NULL) { + conf->blist_devnode = vector_alloc(); + if (!conf->blist_devnode) { + condlog(0, "cannot allocate blacklist\n"); + goto out; + } + } + if (store_ble(conf->blist_devnode, ".*", ORIGIN_NO_CONFIG)) { + condlog(0, "cannot store default no-config blacklist\n"); + goto out; + } } conf->processed_main_config = 1; diff --git a/libmultipath/config.h b/libmultipath/config.h index 384193ab..158cebf0 100644 --- a/libmultipath/config.h +++ b/libmultipath/config.h @@ -10,6 +10,7 @@ #define ORIGIN_DEFAULT 0 #define ORIGIN_CONFIG 1 +#define ORIGIN_NO_CONFIG 2 enum devtypes { DEV_NONE, diff --git a/multipath/main.c b/multipath/main.c index ce702e7f..c21e3e0b 100644 --- a/multipath/main.c +++ b/multipath/main.c @@ -842,11 +842,14 @@ main (int argc, char *argv[]) char *dev = NULL; struct config *conf; bool enable_foreign = false; + bool have_config; + struct stat buf; libmultipath_init(); if (atexit(dm_lib_exit) || atexit(libmultipath_exit)) condlog(1, "failed to register cleanup handler for libmultipath: %m"); logsink = LOGSINK_STDERR_WITH_TIME; + have_config = (stat(DEFAULT_CONFIGFILE, &buf) == 0); if (init_config(DEFAULT_CONFIGFILE)) exit(RTVL_FAIL); if (atexit(uninit_config)) @@ -1097,6 +1100,9 @@ main (int argc, char *argv[]) while ((r = configure(conf, cmd, dev_type, dev)) == RTVL_RETRY) condlog(3, "restart multipath configuration process"); + if (!have_config && r == RTVL_OK && + (cmd == CMD_LIST_SHORT || cmd == CMD_LIST_LONG)) + r = RTVL_FAIL; out: put_multipath_config(conf); if (dev) diff --git a/multipath/multipath.rules.in b/multipath/multipath.rules.in index 780bf852..2c518378 100644 --- a/multipath/multipath.rules.in +++ b/multipath/multipath.rules.in @@ -9,6 +9,7 @@ IMPORT{cmdline}="nompath" ENV{nompath}=="?*", GOTO="end_mpath" IMPORT{cmdline}="multipath" ENV{multipath}=="off", GOTO="end_mpath" +TEST!="/etc/multipath.conf", GOTO="end_mpath" ENV{DEVTYPE}!="partition", GOTO="test_dev" IMPORT{parent}="DM_MULTIPATH_DEVICE_PATH" diff --git a/multipathd/multipathd.8.in b/multipathd/multipathd.8.in index 7bc8806e..315884eb 100644 --- a/multipathd/multipathd.8.in +++ b/multipathd/multipathd.8.in @@ -49,6 +49,8 @@ map regains its maximum performance and redundancy. With the \fB-k\fR option, \fBmultipathd\fR acts as a client utility that sends commands to a running instance of the multipathd daemon (see \fBCOMMANDS\fR below). + +In this Linux distribution, multipathd does not run unless a /etc/multipath.conf file exists. . . .\" ---------------------------------------------------------------------------- diff --git a/multipathd/multipathd.service.in b/multipathd/multipathd.service.in index a63ddd9a..01ceff7d 100644 --- a/multipathd/multipathd.service.in +++ b/multipathd/multipathd.service.in @@ -6,6 +6,7 @@ Wants=systemd-udevd-kernel.socket @MODPROBE_UNIT@ After=systemd-udevd-kernel.socket @MODPROBE_UNIT@ After=multipathd.socket systemd-remount-fs.service Before=initrd-cleanup.service +ConditionPathExists=/etc/multipath.conf DefaultDependencies=no Conflicts=shutdown.target Conflicts=initrd-cleanup.service diff --git a/multipathd/multipathd.socket b/multipathd/multipathd.socket index 6a62f5fd..263b6b0c 100644 --- a/multipathd/multipathd.socket +++ b/multipathd/multipathd.socket @@ -1,6 +1,7 @@ [Unit] Description=multipathd control socket DefaultDependencies=no +ConditionPathExists=/etc/multipath.conf ConditionKernelCommandLine=!nompath ConditionKernelCommandLine=!multipath=off ConditionVirtualization=!container