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authorchristophe.varoqui@free.fr <christophe.varoqui@free.fr>2004-02-13 00:48:36 -0800
committerGreg KH <gregkh@suse.de>2005-04-26 21:32:27 -0700
commitcbb576b91dea8bd84a9fdd147b6b4cbe757dd198 (patch)
treec8cdfff7480e5c8bf8bcf783979c44bb1195f38c /extras/multipath
parent0c040e8d7cc0d027a240769dd7455679beca521d (diff)
[PATCH] more udev-016/extras/multipath
> 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 ?
Diffstat (limited to 'extras/multipath')
-rw-r--r--extras/multipath/ChangeLog4
-rw-r--r--extras/multipath/Makefile10
-rw-r--r--extras/multipath/README8
-rw-r--r--extras/multipath/devmap_name.c60
4 files changed, 80 insertions, 2 deletions
diff --git a/extras/multipath/ChangeLog b/extras/multipath/ChangeLog
index c3361ff8e8..2cc492a192 100644
--- a/extras/multipath/ChangeLog
+++ b/extras/multipath/ChangeLog
@@ -1,4 +1,8 @@
2004-02-04 multipath-016
+ * add devmap_name proggy for udev to name devmaps as per their
+ internal DM name and not only by their sysfs enum name (dm-*)
+ The corresponding udev.rules line is :
+ KERNEL="dm-[0-9]*", PROGRAM="/sbin/devmap_name %M %m", NAME="%k", SYMLINK="%c"
* remove make_dm_node fn & call. Rely on udev for this.
* don't rely on the linux symlink in the udev/klibc dir since
udev build doesn't use it anymore. This corrects build breakage
diff --git a/extras/multipath/Makefile b/extras/multipath/Makefile
index caf24bbd90..c039e2a19f 100644
--- a/extras/multipath/Makefile
+++ b/extras/multipath/Makefile
@@ -36,29 +36,35 @@ recurse:
$(MAKE) KERNEL_DIR=$(KERNEL_DIR) -C $$dir ; \
done
$(MAKE) $(EXEC)
+ $(MAKE) devmap_name
all: recurse
@echo ""
@echo "Make complete"
-
$(EXEC): $(OBJS)
$(LD) -o $(EXEC) $(CRT0) $(OBJS) $(SYSFSOBJS) $(DMOBJS) $(LIB) $(LIBGCC)
strip $(EXEC)
+devmap_name: devmap_name.o
+ $(LD) -o devmap_name $(CRT0) devmap_name.o $(DMOBJS) $(LIB) $(LIBGCC)
+ strip devmap_name
+
clean:
- rm -f core *.o $(EXEC)
+ rm -f core *.o $(EXEC) devmap_name
$(MAKE) -C libdevmapper clean
install:
install -d $(bindir)
install -m 755 $(EXEC) $(bindir)/
+ install -m 755 devmap_name $(bindir)/
install -d /etc/hotplug.d/scsi/
install -m 755 multipath.hotplug /etc/hotplug.d/scsi/
uninstall:
rm /etc/hotplug.d/scsi/multipath.hotplug
rm $(bindir)/$(EXEC)
+ rm $(bindir)/devmap_name
# Code dependencies
main.o: main.c main.h sg_include.h
diff --git a/extras/multipath/README b/extras/multipath/README
index 417a0d38e4..80945db438 100644
--- a/extras/multipath/README
+++ b/extras/multipath/README
@@ -8,6 +8,8 @@ o libsysfs : comes with sysutils or udev
See ftp.kernel.org/pub/linux/utils/kernel/hotplug/
o Linux kernel 2.6.0 with udm5 patchset
http://people.sistina.com/~thornber/dm/
+o udev
+ See ftp.kernel.org/pub/linux/utils/kernel/hotplug/
How it works :
==============
@@ -53,6 +55,12 @@ struct multipath {
When mp is filled, the device maps are fed to the kernel
through libdevmapper.
+The naming of the corresponding block device is handeld
+by udev with the help of the devmap_name proggy. It is
+called by the following rule in /etc/udev/udev.rules :
+KERNEL="dm-[0-9]*", PROGRAM="/sbin/devmap_name %M %m", \
+NAME="%k", SYMLINK="%c"
+
Notes :
=======
diff --git a/extras/multipath/devmap_name.c b/extras/multipath/devmap_name.c
new file mode 100644
index 0000000000..08e526e072
--- /dev/null
+++ b/extras/multipath/devmap_name.c
@@ -0,0 +1,60 @@
+#include "libdevmapper/libdevmapper.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <linux/kdev_t.h>
+
+static void usage(char * progname) {
+ fprintf(stderr, "usage : %s major minor\n", progname);
+ exit(1);
+}
+
+int main(int argc, char **argv)
+{
+ int r = 0;
+ struct dm_names *names;
+ unsigned next = 0;
+ int major, minor;
+
+ /* sanity check */
+ if (argc != 3)
+ usage(argv[0]);
+
+ major = atoi(argv[1]);
+ minor = atoi(argv[2]);
+
+ struct dm_task *dmt;
+
+ if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
+ return 0;
+
+ if (!dm_task_run(dmt))
+ goto out;
+
+ if (!(names = dm_task_get_names(dmt)))
+ goto out;
+
+ if (!names->dev) {
+ printf("No devices found\n");
+ goto out;
+ }
+
+ do {
+ names = (void *) names + next;
+ if ((int) MAJOR(names->dev) == major &&
+ (int) MINOR(names->dev) == minor) {
+ printf("%s\n", names->name);
+ goto out;
+ }
+ next = names->next;
+ } while (next);
+
+ /* No correspondance found */
+ r = 1;
+
+ out:
+ dm_task_destroy(dmt);
+ return r;
+}
+