Use /dev/block to find the block device used for root
instead of searching through mounts.
Signed-off-by: Sasha Levin <levinsasha928@xxxxxxxxx>
---
tools/kvm/kvm-run.c | 48 +++---------------------------------------------
1 files changed, 3 insertions(+), 45 deletions(-)
diff --git a/tools/kvm/kvm-run.c b/tools/kvm/kvm-run.c
index d5a952f..6fee8ae 100644
--- a/tools/kvm/kvm-run.c
+++ b/tools/kvm/kvm-run.c
@@ -249,56 +249,14 @@ static const char *find_kernel(void)
static int root_device(char *dev, long *part)
{
- FILE *fp;
- char *line;
- int tmp;
- size_t nr_read;
- char device[PATH_MAX];
- char mnt_pt[PATH_MAX];
- char resolved_path[PATH_MAX];
- char *p;
struct stat st;
- fp = fopen("/proc/mounts", "r");
- if (!fp)
+ if (stat("/", &st) < 0)
return -1;
- line = NULL;
- tmp = 0;
- while (!feof(fp)) {
- if (getline(&line, &nr_read, fp) < 0)
- break;
- sscanf(line, "%s %s", device, mnt_pt);
- if (!strncmp(device, "/dev", 4) && !strcmp(mnt_pt, "/")) {
- tmp = 1;
- break;
- }
- }
- fclose(fp);
- free(line);
-
- if (!tmp)
- return -1;
-
- /* get the absolute path */
- if (!realpath(device, resolved_path))
- return -1;
-
- /* find the partition number */
- p = resolved_path;
- while (*p) {
- if (isdigit(*p)) {
- strncpy(dev, resolved_path, p - resolved_path);
- *part = atol(p);
- break;
- }
- p++;
- }
-
- /* verify the device path */
- if (stat(dev, &st) < 0)
- return -1;
+ *part = minor(st.st_dev);
+ sprintf(dev, "/dev/block/%u:0", major(st.st_dev));
if (access(dev, R_OK) < 0)
return -1;
--
1.7.5.rc3
--
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