From mboxrd@z Thu Jan 1 00:00:00 1970 From: NeilBrown Subject: [md PATCH 19/26] md: remove unnecessary 'buf' from get_bitmap_file. Date: Wed, 04 Feb 2015 08:42:29 +1100 Message-ID: <20150203214229.3448.31653.stgit@notabene.brown> References: <20150203213948.3448.80258.stgit@notabene.brown> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20150203213948.3448.80258.stgit@notabene.brown> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids 'buf' is only used because d_path fills from the end of the buffer instead of from the start. We don't need a separate buf to handle that, we just need to use memmove() to move the string to the start. Signed-off-by: NeilBrown --- drivers/md/md.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/drivers/md/md.c b/drivers/md/md.c index cbbac7b7238a..01793f24f8de 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -5502,7 +5502,7 @@ static int get_array_info(struct mddev *mddev, void __user *arg) static int get_bitmap_file(struct mddev *mddev, void __user * arg) { mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ - char *ptr, *buf = NULL; + char *ptr; int err = -ENOMEM; file = kmalloc(sizeof(*file), GFP_NOIO); @@ -5516,23 +5516,19 @@ static int get_bitmap_file(struct mddev *mddev, void __user * arg) goto copy_out; } - buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); - if (!buf) - goto out; - ptr = d_path(&mddev->bitmap->storage.file->f_path, - buf, sizeof(file->pathname)); + file->pathname, sizeof(file->pathname)); if (IS_ERR(ptr)) goto out; - strcpy(file->pathname, ptr); + memmove(file->pathname, ptr, + sizeof(file->pathname)-(ptr-file->pathname)); copy_out: err = 0; if (copy_to_user(arg, file, sizeof(*file))) err = -EFAULT; out: - kfree(buf); kfree(file); return err; }