24 lines
615 B
Diff
24 lines
615 B
Diff
--- utils.c
|
|
+++ utils.c
|
|
@@ -833,13 +833,19 @@
|
|
{
|
|
int ret;
|
|
FILE *f;
|
|
+ struct stat stat_buf;
|
|
char fmt[20];
|
|
char p[PATH_MAX];
|
|
char real_loop_dev[PATH_MAX];
|
|
|
|
if (!realpath(loop_dev, real_loop_dev))
|
|
return -errno;
|
|
- snprintf(p, PATH_MAX, "/sys/block/%s/loop/backing_file", strrchr(real_loop_dev, '/'));
|
|
+
|
|
+ if (stat(real_loop_dev, &stat_buf) || !S_ISBLK(stat_buf.st_mode))
|
|
+ return -errno;
|
|
+
|
|
+ snprintf(p, PATH_MAX, "/sys/dev/block/%d:%d/loop/backing_file",
|
|
+ major(stat_buf.st_rdev), minor(stat_buf.st_rdev));
|
|
if (!(f = fopen(p, "r")))
|
|
return -errno;
|
|
|