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Re: [PATCH 06/13] xfs: xfs_sync_data is redundant.

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [PATCH 06/13] xfs: xfs_sync_data is redundant.
From: Mark Tinguely <tinguely@xxxxxxx>
Date: Fri, 28 Sep 2012 16:44:43 -0500
Cc: xfs@xxxxxxxxxxx
In-reply-to: <1348807485-20165-7-git-send-email-david@xxxxxxxxxxxxx>
References: <1348807485-20165-1-git-send-email-david@xxxxxxxxxxxxx> <1348807485-20165-7-git-send-email-david@xxxxxxxxxxxxx>
User-agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:9.0) Gecko/20120122 Thunderbird/9.0
On 09/27/12 23:44, Dave Chinner wrote:
From: Dave Chinner<dchinner@xxxxxxxxxx>

We don't do any data writeback from XFS any more - the VFS is
completely responsible for that, including for freeze. We can
replace the remaining caller with the VFS level function that
achieves the same thing, but without conflicting with current
writeback work - writeback_inodes_sb_if_idle().

This means we can remove the flush_work and xfs_flush_inodes() - the
VFS functionality completely replaces the internal flush queue for
doing this writeback work in a separate context to avoid stack

This does have one complication - it cannot be called with page
locks held.  Hence move the flushing of delalloc space when ENOSPC
occurs back up into xfs_file_aio_buffered_write when we don't hold
any locks that will stall writeback.

Note that we always need to pass a count of zero to
generic_file_buffered_write() as the previously written byte count.
We only do this by accident before this patch by the virtue of ret
always being zero when there are no errors. Make this explicit
rather than needing to specifically zero ret in the ENOSPC retry

Signed-off-by: Dave Chinner<dchinner@xxxxxxxxxx>

Looks good.

Reviewed-by: Mark Tinguely <tinguely@xxxxxxx>

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