[Xen-changelog] [xen-unstable] [BLKTAP] Find major number by searching sysfs

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Node ID 2835083c9c916fdad11110c4810ee271943c1cf6
# Parent  509ff527c59d2ea8aca36f901d0f3fe67f4d52c8
[BLKTAP] Find major number by searching sysfs
instead of reading /proc/devices.

Signed-off-by: Steven Rostedt <srostedt@xxxxxxxxxx>
---
 tools/blktap/drivers/Makefile     |    2 +-
 tools/blktap/drivers/blktapctrl.c |   30 +++---------------------------
 2 files changed, 4 insertions(+), 28 deletions(-)

diff -r 509ff527c59d -r 2835083c9c91 tools/blktap/drivers/Makefile
--- a/tools/blktap/drivers/Makefile     Fri Sep 29 14:42:49 2006 +0100
+++ b/tools/blktap/drivers/Makefile     Fri Sep 29 14:55:57 2006 +0100
@@ -28,7 +28,7 @@ THREADLIB := -lpthread -lz
 THREADLIB := -lpthread -lz
 LIBS      := -L. -L.. -L../lib
 LIBS      += -L$(XEN_LIBXC)
-LIBS      += -lblktap
+LIBS      += -lblktap -lxenctrl
 LIBS      += -lcrypto
 LIBS      += -lz
 LIBS      += -L$(XEN_XENSTORE) -lxenstore
diff -r 509ff527c59d -r 2835083c9c91 tools/blktap/drivers/blktapctrl.c
--- a/tools/blktap/drivers/blktapctrl.c Fri Sep 29 14:42:49 2006 +0100
+++ b/tools/blktap/drivers/blktapctrl.c Fri Sep 29 14:55:57 2006 +0100
@@ -636,30 +636,6 @@ static void print_drivers(void)
                DPRINTF("Found driver: [%s]\n",dtypes[i]->name);
 } 
 
-static int find_blktap_major(void)
-{
-       FILE *fp;
-       int major;
-       char device[256];
-
-       if ((fp = fopen("/proc/devices", "r")) == NULL)
-               return -1;
-
-       /* Skip title */
-       fscanf(fp,"%*s %*s\n");
-       while (fscanf(fp, "%d %255s\n", &major, device) == 2) {
-               if (strncmp("blktap", device, 6) == 0)
-                       break;
-       }
-
-       fclose(fp);
-
-       if (strncmp("blktap", device, 6) == 0)
-               return major;
-
-       return -1;
-}
-
 int main(int argc, char *argv[])
 {
        char *devname;
@@ -681,11 +657,11 @@ int main(int argc, char *argv[])
        register_new_devmap_hook(map_new_blktapctrl);
        register_new_unmap_hook(unmap_blktapctrl);
 
-       /*Attach to blktap0 */  
+       /* Attach to blktap0 */
        asprintf(&devname,"%s/%s0", BLKTAP_DEV_DIR, BLKTAP_DEV_NAME);
-       blktap_major = find_blktap_major();
-       if (blktap_major < 0)
+       if ((ret = xc_find_device_number("blktap0")) < 0)
                goto open_failed;
+       blktap_major = major(ret);
        make_blktap_dev(devname,blktap_major,0);
        ctlfd = open(devname, O_RDWR);
        if (ctlfd == -1) {

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