xfs
[Top] [All Lists]
<prev [Date] next>
[Advanced]
 <prev [Thread] next>

[PATCH 0/8] Set bi_rw when alloc bio before call bio_add_page.

from [majianpeng] [Permanent Link][Original]
To: axboe <axboe@xxxxxxxxx>, "konrad.wilk" <konrad.wilk@xxxxxxxxxx>, "chris.mason" <chris.mason@xxxxxxxxxxxx>, viro <viro@xxxxxxxxxxxxxxxxxx>, tytso <tytso@xxxxxxx>, "adilger.kernel" <adilger.kernel@xxxxxxxxx>, shaggy <shaggy@xxxxxxxxxx>, mfasheh <mfasheh@xxxxxxxx>, jlbec <jlbec@xxxxxxxxxxxx>, bpm <bpm@xxxxxxx>, elder <elder@xxxxxxxxxx>
Subject: [PATCH 0/8] Set bi_rw when alloc bio before call bio_add_page.
From: majianpeng <majianpeng@xxxxxxxxx>
Date: Mon, 30 Jul 2012 15:14:28 +0800
Cc: linux-kernel <linux-kernel@xxxxxxxxxxxxxxx>, linux-btrfs <linux-btrfs@xxxxxxxxxxxxxxx>, linux-fsdevel <linux-fsdevel@xxxxxxxxxxxxxxx>, linux-ext4 <linux-ext4@xxxxxxxxxxxxxxx>, jfs-discussion <jfs-discussion@xxxxxxxxxxxxxxxxxxxxx>, ocfs2-devel <ocfs2-devel@xxxxxxxxxxxxxx>, xfs <xfs@xxxxxxxxxxx>
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:cc:subject:x-priority:x-has-attach:x-mailer :mime-version:message-id:content-type:content-transfer-encoding; bh=6sv8CjJdgg6/oiOoelGE6WieXP+ydXabt6vH/n9LF9M=; b=LPNS99vpZ+ISab7GKQN/sZxdB/eo5G/QuYzIyUzUFMhyD4L3Trv3IQv40HqwF3LKxH T7It44na+KWYAMd6mxXs+940hUjujQOxpAiWlgc7ZtaKXXTOWe+4Vqhs0FAvLaSHlx1W gspMc//F9jr2Vty1fURPNAVJyogbjN3C5dpaBxlW4YNjkzsQPSbDFgB2PzW8JKMVyR/c 4+aqRAOwgA68Z7g1OxHW/yj0XW3YbXMVzDo8KwZc7uoaQev5l660aJ9T+2MTNSX6GLip 8klUi70JtnogTD5JBNBgyNVh+iwF1BBp5djFZ8rzVLoDH8ek3jXWeDsleSFKik+bF4PV lgYw== 
When exec bio_alloc, the bi_rw is zero.But after calling bio_add_page,
it will use bi_rw.
Fox example, in functiion __bio_add_page,it will call merge_bvec_fn().
The merge_bvec_fn of raid456 will use the bi_rw to judge the merge.
>> if ((bvm->bi_rw & 1) == WRITE)
>> return biovec->bv_len; /* always allow writes to be mergeable */


Jianpeng Ma (8):
  Evalue bio->bi_rw after calling bio_alloc() and before calling
    bio_add_page().
  Evalue bio->bi_rw after calling bio_alloc() and before calling    
    bio_add_page().
  Evalue bio->bi_rw after calling bio_alloc() and before calling    
    bio_add_page().
  Evalue bio->bi_rw after calling bio_alloc() and before calling    
    bio_add_page().
  Evalue bio->bi_rw after calling bio_alloc() and before calling    
    bio_add_page().
  Evalue bio->bi_rw after calling bio_alloc() and before calling    
    bio_add_page().
  Evalue bio->bi_rw after calling bio_alloc() and before calling    
    bio_add_page().
  Evalue bio->bi_rw after calling bio_alloc() and before calling    
    bio_add_page().

 block/blk-lib.c                     |    1 +
 drivers/block/xen-blkback/blkback.c |    1 +
 fs/btrfs/check-integrity.c          |    1 +
 fs/direct-io.c                      |    1 +
 fs/ext4/page-io.c                   |    1 +
 fs/jfs/jfs_metapage.c               |    1 +
 fs/ocfs2/cluster/heartbeat.c        |    8 +++++---
 fs/xfs/xfs_aops.c                   |    2 ++
 fs/xfs/xfs_buf.c                    |    1 +
 9 files changed, 14 insertions(+), 3 deletions(-)

-- 
1.7.9.5
[More with this subject...]
<Prev in Thread] Current Thread [Next in Thread>
Previous by Date:  dog products, 3U Pet Supply
Next by Date:  [PATCH 1/8] Evalue bio->bi_rw after calling bio_alloc() and before calling bio_add_page()., kedacomkernel
Previous by Thread:  dog products, 3U Pet Supply
Next by Thread:  Re: [PATCH 0/8] Set bi_rw when alloc bio before call bio_add_page., Konrad Rzeszutek Wilk
Indexes:  [Date] [Thread] [Top] [All Lists]