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/super0.c b/super0.c
index 4d02300..f14f076 100644
--- a/super0.c
+++ b/super0.c
@@ -625,7 +625,8 @@ static int store_super0(struct supertype *st, int fd, void *sbv)
 	if (super->state & (1<<MD_SB_BITMAP_PRESENT)) {
 		struct bitmap_super_s * bm = (struct bitmap_super_s*)(super+1);
 		if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC)
-			write(fd, bm, sizeof(*bm));
+			if (write(fd, bm, sizeof(*bm)) != sizeof(*bm))
+			    return 5;
 	}
 
 	fsync(fd);