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, 3 insertions, 1 deletions

diff --git a/Assemble.c b/Assemble.c
index 816a88e..cb97f8c 100644
--- a/Assemble.c
+++ b/Assemble.c
@@ -451,7 +451,9 @@ int Assemble(struct supertype *st, char *mddev, int mdfd,
 
 			if (strcmp(update, "uuid")==0 &&
 			    ident->bitmap_fd)
-				bitmap_update_uuid(ident->bitmap_fd, info.uuid);
+				if (bitmap_update_uuid(ident->bitmap_fd, info.uuid) != 0)
+					fprintf(stderr, Name ": Could not update uuid on %s.\n",
+						devname);
 		} else
 #endif
 		{