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Commit b17621fe authored by Wu Fengguang's avatar Wu Fengguang Committed by Jens Axboe
Browse files

writeback: introduce wbc.for_background 



It will lower the flush priority for NFS, and maybe more in future.

Signed-off-by: default avatarWu Fengguang <fengguang.wu@intel.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent 951c30d1

fs/fs-writeback.c

+1 −0
Original line number Diff line number Diff line
@@ -738,6 +738,7 @@ static long wb_writeback(struct bdi_writeback *wb, 
		.sync_mode		= args->sync_mode,

		.older_than_this	= NULL,

		.for_kupdate		= args->for_kupdate,

		.for_background		= args->for_background,

		.range_cyclic		= args->range_cyclic,

	};

	unsigned long oldest_jif;

fs/nfs/write.c

+1 −1
Original line number Diff line number Diff line
@@ -178,7 +178,7 @@ static int wb_priority(struct writeback_control *wbc) 
{

	if (wbc->for_reclaim)

		return FLUSH_HIGHPRI | FLUSH_STABLE;

	if (wbc->for_kupdate)

	if (wbc->for_kupdate || wbc->for_background)

		return FLUSH_LOWPRI;

	return 0;

}

include/linux/writeback.h

+1 −0
Original line number Diff line number Diff line
@@ -49,6 +49,7 @@ struct writeback_control { 
	unsigned nonblocking:1;		/* Don't get stuck on request queues */

	unsigned encountered_congestion:1; /* An output: a queue is full */

	unsigned for_kupdate:1;		/* A kupdate writeback */

	unsigned for_background:1;	/* A background writeback */

	unsigned for_reclaim:1;		/* Invoked from the page allocator */

	unsigned range_cyclic:1;	/* range_start is cyclic */

	unsigned more_io:1;		/* more io to be dispatched */