cbb576b91d
> Hello,
>
> incremental to udev-016/extras/multipath,
>
> * don't rely on the linux symlink in the udev/klibc dir since
> udev build doesn't use it anymore. This corrects build breakage
> * remove make_dm_node fn & call. Rely on udev for this.
>
> The first patch is to be applied.
> The second is conditioned by udev dealing correctly with devmap names.
>
> For this I can suggest a CALLOUT rule like this :
> KERNEL="dm-[0-9]*", PROGRAM="/tmp/name_devmap %M %m", NAME="%k",
> SYMLINK="%c"
>
> With name_devmap like :
> #!/bin/sh
> /usr/sbin/dmsetup ls|/bin/grep "$1, $2"|/usr/bin/awk '{print $1}'
>
ok I coded the suggested tool.
it works with the following rule :
KERNEL="dm-[0-9]*", PROGRAM="/sbin/devmap_name %M %m", NAME="%k", SYMLINK="%c"
I don't know if it's right to keep this tools packaged with multipath because
it's widely more general.
Maybe Joe should merge it in the device-mapper package or provide the
functionnality through dmsetup ?
61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
#include "libdevmapper/libdevmapper.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <linux/kdev_t.h>
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static void usage(char * progname) {
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fprintf(stderr, "usage : %s major minor\n", progname);
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exit(1);
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}
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int main(int argc, char **argv)
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{
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int r = 0;
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struct dm_names *names;
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unsigned next = 0;
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int major, minor;
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/* sanity check */
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if (argc != 3)
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usage(argv[0]);
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major = atoi(argv[1]);
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minor = atoi(argv[2]);
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struct dm_task *dmt;
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if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
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return 0;
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if (!dm_task_run(dmt))
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goto out;
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if (!(names = dm_task_get_names(dmt)))
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goto out;
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if (!names->dev) {
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printf("No devices found\n");
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goto out;
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}
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do {
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names = (void *) names + next;
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if ((int) MAJOR(names->dev) == major &&
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(int) MINOR(names->dev) == minor) {
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printf("%s\n", names->name);
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goto out;
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}
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next = names->next;
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} while (next);
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/* No correspondance found */
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r = 1;
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out:
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dm_task_destroy(dmt);
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return r;
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}
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