On Wed, Jul 18, 2007 at 06:04:01PM -0700, Brian De Wolf wrote:
> Hello,
>
> Recently I've been using the latest git versions of multipath-tools and I've
> noticed that the udev rules that are included, specifically those for kpartx,
> refer to environment variables such as DM_TABLE_STATE, DM_PART, DM_UUID, etc.
> However, the kpartx.rules file contains nothing that would bring those
> environment variables into the environment. After some googling, I found
> http://ftp.frugalware.org/pub/frugalware/frugalware-current/source/lib/device-mapper/
> which has a patch that adds a command to dmsetup called 'export'. I've found
> various udev scripts that use this command to pull the environment variables I
> listed before for use in udev rules and the multipath-tools kpartx.rules file
> itself works perfectly when the correct 'dmsetup export' command is imported.
>
Errm. Oops.
Well, I'm to blame here. When creating the rules I totally forgot that we've hacked
dmsetup to provide an 'export' switch.
> What really puzzles me is that this patch was very difficult to find, but is
> essential to the 'official' multipath-tools udev rules. Is there something that
> I'm missing that makes this all make sense?
>
As already said, it totally makes sense when you hack up dmsetup and then forget
about the patch. Sorry about this.
Alasdair, care to incorporate it?
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare@xxxxxxx +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 N�rnberg
GF: Markus Rex, HRB 16746 (AG N�rnberg)
diff --git a/dmsetup/dmsetup.c b/dmsetup/dmsetup.c
index 25f14a6..b693008 100644
--- a/dmsetup/dmsetup.c
+++ b/dmsetup/dmsetup.c
@@ -995,6 +995,94 @@ static int _status(int argc, char **argv
return r;
}
+static int _export(int argc, char **argv, void *data)
+{
+ int r = 0;
+ struct dm_task *dmt = NULL;
+ void *next = NULL;
+ uint64_t start, length;
+ char *target_type = NULL;
+ char *params;
+ struct dm_names *names = (struct dm_names *) data;
+ const char *name = NULL;
+ const char *uuid = NULL;
+ struct dm_info info;
+
+ if (data)
+ name = names->name;
+ else if (argc == 2)
+ name = argv[1];
+
+ if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
+ goto out;
+
+ if (!_set_task_device(dmt, name, 0))
+ goto out;
+
+ if (!dm_task_run(dmt))
+ goto out;
+
+ if (!dm_task_get_info(dmt, &info) || !info.exists)
+ goto out;
+
+ if (!name)
+ name = dm_task_get_name(dmt);
+
+ uuid = dm_task_get_uuid(dmt);
+ printf("DM_NAME=%s\n", name);
+
+ if ((uuid = dm_task_get_uuid(dmt)) && *uuid)
+ printf("DM_UUID=%s\n", uuid);
+
+ if (!info.exists) {
+ printf("DM_STATE=NOTPRESENT\n");
+ goto out;
+ }
+
+ printf("DM_STATE=%s\n",
+ info.suspended ? "SUSPENDED" :
+ (info.read_only ? " READONLY" : "ACTIVE"));
+
+ if (!info.live_table && !info.inactive_table)
+ printf("DM_TABLE_STATE=NONE\n");
+ else
+ printf("DM_TABLE_STATE=%s%s%s\n",
+ info.live_table ? "LIVE" : "",
+ info.live_table && info.inactive_table ? "/" : "",
+ info.inactive_table ? "INACTIVE" : "");
+
+ if (info.open_count != -1)
+ printf("DM_OPENCOUNT=%d\n", info.open_count);
+
+ printf("DM_LAST_EVENT_NR=%" PRIu32 "\n", info.event_nr);
+
+ printf("DM_MAJOR=%d\n", info.major);
+ printf("DM_MINOR=%d\n", info.minor);
+
+ if (info.target_count != -1)
+ printf("DM_TARGET_COUNT=%d\n", info.target_count);
+
+ /* export all table types */
+ next = dm_get_next_target(dmt, next, &start, &length,
+ &target_type, ¶ms);
+ if (target_type) {
+ printf("DM_TARGET_TYPES=%s", target_type);
+ while (next) {
+ next = dm_get_next_target(dmt, next, &start, &length,
+ &target_type, ¶ms);
+ if (target_type)
+ printf(",%s", target_type);
+ }
+ printf("\n");
+ }
+
+ r = 1;
+ out:
+ if (dmt)
+ dm_task_destroy(dmt);
+ return r;
+}
+
/* Show target names and their version numbers */
static int _targets(int argc __attribute((unused)), char **argv __attribute((unused)), void *data __attribute((unused)))
{
@@ -1699,6 +1787,7 @@ static struct command _commands[] = {
{"info", "[<device>]", 0, 1, _info},
{"deps", "[<device>]", 0, 1, _deps},
{"status", "[<device>] [--target <target_type>]", 0, 1, _status},
+ {"export", "[<device>]", 0, 1, _export},
{"table", "[<device>] [--target <target_type>] [--showkeys]", 0, 1, _status},
{"wait", "<device> [<event_nr>]", 0, 2, _wait},
{"mknodes", "[<device>]", 0, 1, _mknodes},
diff --git a/man/dmsetup.8 b/man/dmsetup.8
index 5b2ed9f..c4524aa 100644
--- a/man/dmsetup.8
+++ b/man/dmsetup.8
@@ -39,13 +39,16 @@ dmsetup \- low level logical volume mana
.B dmsetup ls
.I [--target target_type] [--exec command] [--tree [-o options]]
.br
-.B dmsetup info
+.B dmsetup info
.I [device_name]
.br
.B dmsetup info -c|-C|--columns
.I [--noheadings] [--separator separator] [-o fields] [-O|--sort sort_fields]
.I [device_name]
.br
+.B dmsetup export
+.I [device_name]
+.br
.B dmsetup deps
.I [device_name]
.br
@@ -138,6 +141,10 @@ device_name in subsequent dmsetup comman
If successful a device will appear as
/dev/device-mapper/<device-name>.
See below for information on the table format.
+.IP \fBexport
+.I [device_name]
+.br
+Outputs information in key/value format to be imported by other programs.
.IP \fBdeps
.I [device_name]
.br
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