From: David Sterba <dsterba@suse.cz>
To: Anand Jain <anand.jain@oracle.com>
Cc: linux-btrfs@vger.kernel.org, dsterba@suse.cz, quwenruo@cn.fujitsu.com
Subject: Re: [PATCH 1/4] btrfs: REQ_PREFLUSH does not use btrfs_end_bio() completion callback
Date: Tue, 28 Mar 2017 17:19:56 +0200 [thread overview]
Message-ID: <20170328151956.GZ4781@twin.jikos.cz> (raw)
In-Reply-To: <20170313074214.24123-2-anand.jain@oracle.com>
On Mon, Mar 13, 2017 at 03:42:11PM +0800, Anand Jain wrote:
> REQ_PREFLUSH bio to flush dev cache uses btrfs_end_empty_barrier()
> completion callback only, as of now, and there it accounts for dev
> stat flush errors BTRFS_DEV_STAT_FLUSH_ERRS, so remove it from the
> btrfs_end_bio().
Can you please be more specific? I was trying to find the code path that
does the supposedly duplicate accounting for BTRFS_DEV_STAT_FLUSH_ERRS,
but still not there after half an hour.
submit_stripe_bio
btrfsic_submit_bio
btrfs_end_bio
-> stats accounting
write_dev_flush
btrfsic_submit_bio
btrfs_end_empty_barrier
complete
now here it wakes up flush_wait, that is only waited for in
write_dev_flush, there the FLUSH_ERRS accounting happens, but ... I'm
not sure if I haven't lost in the bio handling maze.
next prev parent reply other threads:[~2017-03-28 15:21 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-13 7:42 [PATCH 0/4] cleanup barrier_all_devices() Anand Jain
2017-03-13 7:42 ` [PATCH 1/4] btrfs: REQ_PREFLUSH does not use btrfs_end_bio() completion callback Anand Jain
2017-03-28 15:19 ` David Sterba [this message]
2017-03-29 10:00 ` Anand Jain
2017-03-30 10:57 ` Anand Jain
2017-03-13 7:42 ` [PATCH 2/4] btrfs: Communicate back ENOMEM when it occurs Anand Jain
2017-03-14 8:49 ` Qu Wenruo
2017-03-28 15:38 ` David Sterba
2017-03-29 10:00 ` Anand Jain
2017-03-13 7:42 ` [PATCH 3/4] btrfs: cleanup barrier_all_devices() unify dev error count Anand Jain
2017-03-14 8:53 ` Qu Wenruo
2017-03-13 7:42 ` [PATCH 4/4] btrfs: cleanup barrier_all_devices() to check dev stat flush error Anand Jain
2017-03-13 9:05 ` Qu Wenruo
2017-03-13 16:21 ` Anand Jain
2017-03-14 0:28 ` Qu Wenruo
2017-03-14 3:36 ` Anand Jain
2017-03-14 8:26 ` [PATCH V2 " Anand Jain
2017-03-14 8:47 ` Qu Wenruo
2017-03-28 16:19 ` David Sterba
2017-03-29 10:00 ` Anand Jain
2017-03-31 11:36 ` [PATCH 4/4 V2] " Anand Jain
2017-04-05 4:07 ` [PATCH 4/4 V3] " Anand Jain
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