lkml.org 
[lkml]   [2017]   [Aug]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v1 2/6] fs: use on-stack-bio if backing device has BDI_CAP_SYNC capability
On Wed, Aug 09, 2017 at 10:51:13AM +0900, Minchan Kim wrote:
> On Tue, Aug 08, 2017 at 06:29:04AM -0700, Matthew Wilcox wrote:
> > On Tue, Aug 08, 2017 at 05:49:59AM -0700, Matthew Wilcox wrote:
> > > + struct bio sbio;
> > > + struct bio_vec sbvec;
> >
> > ... this needs to be sbvec[nr_pages], of course.
> >
> > > - bio = mpage_alloc(bdev, blocks[0] << (blkbits - 9),
> > > + if (bdi_cap_synchronous_io(inode_to_bdi(inode))) {
> > > + bio = &sbio;
> > > + bio_init(bio, &sbvec, nr_pages);
> >
> > ... and this needs to be 'sbvec', not '&sbvec'.
>
> I don't get it why we need sbvec[nr_pages].
> On-stack-bio works with per-page.
> May I miss something?

The way I redid it, it will work with an arbitrary number of pages.

\
 
 \ /
  Last update: 2017-08-09 05:32    [W:0.047 / U:2.264 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site