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writeback: introduce wbc.for_background

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

Signed-off-by: Wu 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: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Wu Fengguang 2009-12-03 13:54:25 +01:00 committed by Jens Axboe
parent 951c30d135
commit b17621fed6
3 changed files with 3 additions and 1 deletions
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1
fs/fs-writeback.c
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@ -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;

2
fs/nfs/write.c
View file

@ -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;
}

1
include/linux/writeback.h
View file

@ -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 */