The way that multipath decided what you passed in as an argument didn't
always work. If the argument was the name of a file, then multipath
assumed that it was a path. That meant if you were in /dev/mapper and ran
# multipath -f <mpath_device_name>
It would fail, since it thought you gave it a path name, instead of a
multipath device name. Now multipath will only treat the argument
as a path name if it is a block device with a different major number than
device-mapper's. Also, I've switched the MAJOR/MINOR/MKDEV macros to
work like kpartx, so that they can handle minor numbers over 255.
Signed-off-by: Benjamin Marzinski <bmarzins@xxxxxxxxxx>
---
multipath/dev_t.h | 18 +++---------------
multipath/main.c | 30 +++++++++++++++++++++---------
2 files changed, 24 insertions(+), 24 deletions(-)
Index: multipath-tools-111010/multipath/main.c
===================================================================
--- multipath-tools-111010.orig/multipath/main.c
+++ multipath-tools-111010/multipath/main.c
@@ -22,6 +22,8 @@
* Copyright (c) 2005 Edward Goggin, EMC
*/
+#include <sys/types.h>
+#include <sys/stat.h>
#include <stdio.h>
#include <unistd.h>
#include <ctype.h>
@@ -51,6 +53,7 @@
#include <errno.h>
#include <sys/time.h>
#include <sys/resource.h>
+#include "dev_t.h"
int logsink;
@@ -374,13 +377,29 @@ dump_config (void)
return 0;
}
+static int
+get_dev_type(char *dev) {
+ struct stat buf;
+ int i;
+
+ if (stat(dev, &buf) == 0 && S_ISBLK(buf.st_mode)) {
+ if (dm_is_dm_major(MAJOR(buf.st_rdev)))
+ return DEV_DEVMAP;
+ return DEV_DEVNODE;
+ }
+ else if (sscanf(dev, "%d:%d", &i, &i) == 2)
+ return DEV_DEVT;
+ else
+ return DEV_DEVMAP;
+}
+
int
main (int argc, char *argv[])
{
int arg;
extern char *optarg;
extern int optind;
- int i, r = 1;
+ int r = 1;
if (getuid() != 0) {
fprintf(stderr, "need to be root\n");
@@ -478,14 +497,7 @@ main (int argc, char *argv[])
goto out;
strncpy(conf->dev, argv[optind], FILE_NAME_SIZE);
-
- if (filepresent(conf->dev))
- conf->dev_type = DEV_DEVNODE;
- else if (sscanf(conf->dev, "%d:%d", &i, &i) == 2)
- conf->dev_type = DEV_DEVT;
- else
- conf->dev_type = DEV_DEVMAP;
-
+ conf->dev_type = get_dev_type(conf->dev);
}
conf->daemon = 0;
Index: multipath-tools-111010/multipath/dev_t.h
===================================================================
--- multipath-tools-111010.orig/multipath/dev_t.h
+++ multipath-tools-111010/multipath/dev_t.h
@@ -1,15 +1,3 @@
-#define MINORBITS 20
-#define MINORMASK ((1U << MINORBITS) - 1)
-
-#define MAJOR(dev) ((unsigned int) ((dev) >> MINORBITS))
-#define MINOR(dev) ((unsigned int) ((dev) & MINORMASK))
-#define MKDEV(ma,mi) (((ma) << MINORBITS) | (mi))
-
-#define print_dev_t(buffer, dev) \
- sprintf((buffer), "%u:%u\n", MAJOR(dev), MINOR(dev))
-
-#define format_dev_t(buffer, dev) \
- ({ \
- sprintf(buffer, "%u:%u", MAJOR(dev), MINOR(dev)); \
- buffer; \
- })
+#define MAJOR(dev) ((dev & 0xfff00) >> 8)
+#define MINOR(dev) ((dev & 0xff) | ((dev >> 12) & 0xfff00))
+#define MKDEV(ma,mi) ((mi & 0xff) | (ma << 8) | ((mi & ~0xff) << 12))
--
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