linux-kernel - Re: [PATCH] btrfs: use list_for_each_entry

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Message-ID: <CAG5DWoi_BQvHYcPySZBLQpB3wbYeqvYj_CE1RvEBSB8xibtrDw@mail.gmail.com>
Date:	Mon, 29 Jul 2013 11:48:32 +0400
From:	Azat Khuzhin <a3at.mail@...il.com>
To:	linux-btrfs@...r.kernel.org
Cc:	chris.mason@...ionio.com, Azat Khuzhin <a3at.mail@...il.com>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] btrfs: use list_for_each_entry_safe() when delete items

On Sat, Jul 27, 2013 at 2:12 PM, Azat Khuzhin <a3at.mail@...il.com> wrote:
> Replace list_for_each_entry() by list_for_each_entry_safe() in
> __btrfs_close_devices()
>
> There is another place that delete items lock_stripe_add(), but there we
> don't need safe version, because after deleting we exit from loop.
>
> Signed-off-by: Azat Khuzhin <a3at.mail@...il.com>
> ---
>  fs/btrfs/volumes.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
> index 78b8717..1d1b595 100644
> --- a/fs/btrfs/volumes.c
> +++ b/fs/btrfs/volumes.c
> @@ -616,13 +616,13 @@ static void free_device(struct rcu_head *head)
>
>  static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
>  {
> -       struct btrfs_device *device;
> +       struct btrfs_device *device, *next;
>
>         if (--fs_devices->opened > 0)
>                 return 0;
>
>         mutex_lock(&fs_devices->device_list_mutex);
> -       list_for_each_entry(device, &fs_devices->devices, dev_list) {
> +       list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
>                 struct btrfs_device *new_device;
>                 struct rcu_string *name;

There is "kfree(device);" at the end of loop, maybe there must "goto
again;" after it?
(instead of this patch)

>
> --
> 1.7.10.4
>



-- 
Respectfully
Azat Khuzhin
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