lkml.org 
[lkml]   [2018]   [Nov]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH V10 07/19] btrfs: use bvec_last_segment to get bio's last page
    On Fri, Nov 16, 2018 at 02:37:10PM +0100, Christoph Hellwig wrote:
    > On Thu, Nov 15, 2018 at 04:52:54PM +0800, Ming Lei wrote:
    > > index 2955a4ea2fa8..161e14b8b180 100644
    > > --- a/fs/btrfs/compression.c
    > > +++ b/fs/btrfs/compression.c
    > > @@ -400,8 +400,11 @@ blk_status_t btrfs_submit_compressed_write(struct inode *inode, u64 start,
    > > static u64 bio_end_offset(struct bio *bio)
    > > {
    > > struct bio_vec *last = bio_last_bvec_all(bio);
    > > + struct bio_vec bv;
    > >
    > > - return page_offset(last->bv_page) + last->bv_len + last->bv_offset;
    > > + bvec_last_segment(last, &bv);
    > > +
    > > + return page_offset(bv.bv_page) + bv.bv_len + bv.bv_offset;
    >
    > I don't think we need this. If last is a multi-page bvec bv_offset
    > will already contain the correct offset from the first page.

    Yeah, it is true for this specific case, looks we can drop this patch.


    thanks,
    Ming

    \
     
     \ /
      Last update: 2018-11-19 09:10    [W:4.014 / U:0.032 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site