[PATCH] [f2fs-tools] mkfs: Make HDIO_GETGEO ioctl optional

[Ezequiel Garcia <elezegarcia@gmail.com>]

From: Ezequiel Garcia <ezequiel@free-electrons.com>

Some block devices don't implement HDIO_GETGEP ioctl;
loop device being a notable example.
Without this patch, it's not possible to make a f2fs
on a file mounted over a loop device.

Signed-off-by: Ezequiel Garcia <ezequiel@free-electrons.com>
---
 mkfs/f2fs_format.c |    9 ++++-----
 1 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/mkfs/f2fs_format.c b/mkfs/f2fs_format.c
index d3e1d0c..b542db5 100644
--- a/mkfs/f2fs_format.c
+++ b/mkfs/f2fs_format.c
@@ -262,11 +262,10 @@ static int8_t f2fs_get_device_info()
 			return -1;
 		}
 
-		if (ioctl(fd, HDIO_GETGEO, &geom) < 0) {
-			printf("\n\tError: Cannot get the device geometry\n");
-			return -1;
-		}
-		f2fs_params.start_sector = geom.start;
+		if (ioctl(fd, HDIO_GETGEO, &geom) < 0)
+			f2fs_params.start_sector = 0;
+		else
+			f2fs_params.start_sector = geom.start;
 	}
 	else {
 		printf("\n\n\tError: Volume type is not supported!!!\n");
-- 
1.7.8.6