From: Wu Fengguang Date: Thu, 3 Dec 2009 12:54:25 +0000 (+0100) Subject: writeback: introduce wbc.for_background X-Git-Tag: 2.1b_release~10246^2~35 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b17621fed6aa039387e35f9b4d34d98f213e5673;p=platform%2Fkernel%2Fkernel-mfld-blackbay.git writeback: introduce wbc.for_background It will lower the flush priority for NFS, and maybe more in future. Signed-off-by: Wu Fengguang Cc: Trond Myklebust Cc: Jens Axboe Cc: Christoph Hellwig Signed-off-by: Jens Axboe --- diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 0306c8e..0793961 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -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; diff --git a/fs/nfs/write.c b/fs/nfs/write.c index 53eb26c..c84b5cc 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -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; } diff --git a/include/linux/writeback.h b/include/linux/writeback.h index 66ebddc..705f01f 100644 --- a/include/linux/writeback.h +++ b/include/linux/writeback.h @@ -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 */