fs: sysv: Fix sysv_nblocks() returns wrong value

[ Upstream commit e0c49bd ]

sysv_nblocks() returns 'blocks' rather than 'res', which only counting
the number of triple-indirect blocks and causing sysv_getattr() gets a
wrong result.

[AV: this is actually a sysv counterpart of minixfs fix -
0fcd426de9d0 "[PATCH] minix block usage counting fix" in
historical tree; mea culpa, should've thought to check
fs/sysv back then...]

Fixes: 1da177e ("Linux-2.6.12-rc2")
Signed-off-by: Chen Zhongjin <chenzhongjin@huawei.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

fs/sysv/itree.c

@@ -438,7 +438,7 @@ static unsigned sysv_nblocks(struct super_block *s, loff_t size)
 		res += blocks;
 		direct = 1;
 	}
-	return blocks;
+	return res;
 }
 
 int sysv_getattr(struct user_namespace *mnt_userns, const struct path *path,