check return status of all write/fwrite functions as required by glibc 2.4

From: Luca Berra <bluca@vodka.it>

glibc 2.4 is pedantic on ignoring return values from fprintf, fwrite and
write, so now we check the rval and actually do something with it.
in the Grow.c case i only print a warning, since i don't think we can do
anything in case we fail invalidating those superblocks (is should never
happen, but then...)

Signed-off-by: Neil Brown <neilb@suse.de>

1 files changed, 2 insertions, 1 deletions

diff --git a/super1.c b/super1.c
index 8f648f6..28332cd 100644
--- a/super1.c
+++ b/super1.c
@@ -715,7 +715,8 @@ static int store_super1(struct supertype *st, int fd, void *sbv)
 			(((char*)sb)+1024);
 		if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC) {
 			locate_bitmap1(st, fd, sbv);
-			write(fd, bm, sizeof(*bm));
+			if (write(fd, bm, sizeof(*bm)) != sizeof(*bm))
+			    return 5;
 		}
 	}
 	fsync(fd);