On Tue, Jul 30, 2013 at 7:40 AM, Miao Xie <mi...@cn.fujitsu.com> wrote:
> On mon, 29 Jul 2013 11:48:32 +0400, Azat Khuzhin wrote:
>> On Sat, Jul 27, 2013 at 2:12 PM, Azat Khuzhin <a3at.m...@gmail.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.m...@gmail.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)
Ugh. I was looking into another function!
>
> Your fix is right, we needn't search from the head once again.
>
> The other fix way is:
> call_rcu(&device->rcu, free_device);
> + device = new_device;
> }
> but from the viewpoint of the readability, this way is not so good.
>
> Reviewed-by: Miao Xie <mi...@cn.fujitsu.com>
Thanks!
Miao, should I resend patch with you reviewed-by?
>
>>
>>>
>>> --
>>> 1.7.10.4
>>>
>>
>>
>>
>
--
Respectfully
Azat Khuzhin
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