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Old 03-21-2008, 03:07 AM
 
Default Cluster Project branch, master, updated. gfs-kernel_0_1_22-91-gf61b789

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- Log -----------------------------------------------------------------
commit f61b7891dfeab418bd1a20a12f084e848df335fc
Author: Fabio M. Di Nitto <fabbione@fabbione.net>
Date: Fri Mar 21 05:05:43 2008 +0100

[CMAN] Drop dependency on libdevmapper

Signed-off-by: Fabio M. Di Nitto <fabbione@fabbione.net>

-----------------------------------------------------------------------

Summary of changes:
cman/qdisk/Makefile | 8 +-----
cman/qdisk/scandisk.c | 54 +++++++++++++++++++++++++++++++++++++++----------
2 files changed, 45 insertions(+), 17 deletions(-)

diff --git a/cman/qdisk/Makefile b/cman/qdisk/Makefile
index e587941..4d3634d 100644
--- a/cman/qdisk/Makefile
+++ b/cman/qdisk/Makefile
@@ -30,10 +30,7 @@ CFLAGS += -I$(S)
CFLAGS += -I${incdir}

EXTRA_LDFLAGS += -L${cmanlibdir} -L${ccslibdir} -lcman -lccs
-#
-# XXX Fabio has a way to clean up the devmapper requirement
-#
-EXTRA_LDFLAGS += -lpthread -ldevmapper
+EXTRA_LDFLAGS += -lpthread

OBJS1= main.o
score.o
@@ -54,9 +51,8 @@ SHAREDOBJS= disk.o
${TARGET1}: ${SHAREDOBJS} ${OBJS1}
$(CC) -o $@ $^ $(LDFLAGS) $(EXTRA_LDFLAGS)

-# XXX Remove $(EXTRA_LDFLAGS) when libdevmapper is no longer required
${TARGET2}: ${SHAREDOBJS} ${OBJS2}
- $(CC) -o $@ $^ $(LDFLAGS) $(EXTRA_LDFLAGS)
+ $(CC) -o $@ $^ $(LDFLAGS)

depends:
$(MAKE) -C ../lib all
diff --git a/cman/qdisk/scandisk.c b/cman/qdisk/scandisk.c
index b0bd8a6..f4f7e0d 100644
--- a/cman/qdisk/scandisk.c
+++ b/cman/qdisk/scandisk.c
@@ -19,7 +19,6 @@
#include <dirent.h>
#include <sys/sysmacros.h>
#include <sys/stat.h>
-#include <libdevmapper.h>

#include "scandisk.h"

@@ -393,25 +392,58 @@ static int scanmdstat(struct devlisthead *devlisthead)
return 1;
}

-/* TODO: add more stuff from devmapper to understand if a maj/min
- * is a slave or a holder. If we have sysfs this is of no use.
- */
-
-/* scanmapper uses libdevmapper to identify devices that are not real
+/* scanmapper parses /proc/devices to identify what maj are associated
+ * with device-mapper
*
* ret:
* can't fail for now
*/
static int scanmapper(struct devlisthead *devlisthead)
{
- struct devnode *startnode = devlisthead->devnode;
+ struct devnode *startnode;
+ FILE *fp;
+ char line[4096];
+ char major[4];
+ char device[64];
+ int maj, start = 0;
+
+ fp = fopen("/proc/devices", "r");
+ if (!fp)
+ return 0;
+
+ while (fgets(line, sizeof(line), fp) != NULL) {
+ memset(major, 0, 4);
+ memset(device, 0, 64);
+
+ if (strlen(line) > 4096)
+ continue;
+
+ if (!strncmp(line, "Block devices:", 13)) {
+ start = 1;
+ continue;
+ }
+
+ if (!start)
+ continue;
+
+ sscanf(line, "%s %s", major, device);
+
+ if (!strncmp(device, "device-mapper", 13)) {
+ maj = atoi(major);
+ startnode = devlisthead->devnode;
+
+ while (startnode) {
+ if (startnode->maj == maj)
+ startnode->mapper = 1;
+
+ startnode = startnode->next;
+ }
+
+ }

- while (startnode) {
- if (dm_is_dm_major(startnode->maj) > 0)
- startnode->mapper = 1;
- startnode = startnode->next;
}

+ fclose(fp);
return 1;
}



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