Re: [PATCH] btrfs: Remove pair of bio_get/put in btrfs_schedule_bio

[Liu Bo <bo.li.liu@oracle.com>]

On Tue, Dec 12, 2017 at 07:52:38PM +0100, David Sterba wrote:
> On Mon, Dec 11, 2017 at 02:57:56PM -0800, Liu Bo wrote:
> > On Mon, Dec 11, 2017 at 04:38:48PM +0200, Nikolay Borisov wrote:
> > > This code was added in 492bb6deee34 ("Btrfs: Hold a reference on bios
> > > during submit_bio, add some extra bio checks"). However, holding a
> > > reference on a bio is necessary only if it's going to be referenced
> > > after the submit_bio returns and the bio is completed. In this
> > > particular instance this is not the case so there is no need to hold
> > > an extra reference since we directly return.
> > >
> > 
> > Looks good.  If possible, please also drop other unnecessary bio_get()
> > in btrfs.
> 
> You mean everywhere with similar context like in this patch?
>

Right, there're several places where bio_get() is put before running
functions but bio_put() is also put immediately without referencing
bio.

thanks,
-liubo