mdadm/util: unify fstat checking blkdev into function

declare function fstat_is_blkdev() to integrate repeated fstat
checking block device operations, it returns true/1 when it is
a block device, and returns false/0 when it isn't.
The fd and devname are necessary parameters, *rdev is optional,
parse the pointer of dev_t *rdev, if valid, assigned the device
number to dev_t *rdev, if NULL, ignores.

Signed-off-by: Zhilong Liu <zlliu@suse.com>
Signed-off-by: Jes Sorensen <jsorensen@fb.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/Manage.c b/Manage.c
index 230309b8..af55266b 100644
--- a/Manage.c
+++ b/Manage.c
@@ -1513,7 +1513,7 @@ int Manage_subdevs(char *devname, int fd,
 			struct stat stb;
 			tfd = dev_open(dv->devname, O_RDONLY);
 			if (tfd >= 0) {
-				fstat(tfd, &stb);
+				fstat_is_blkdev(tfd, dv->devname, &rdev);
 				close(tfd);
 			} else {
 				int open_err = errno;