block: filter flush bio's in __generic_make_request()

There are a number of make_request based drivers which don't support
cache flushes.  Filter out flush bio's in __generic_make_request() so
that they don't have to worry about them.  All FLUSH/FUA requests with
data are converted to regular IO requests and empty ones are completed
immediately.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

diff --git a/block/blk-core.c b/block/blk-core.c
index 18455c4f618a5bdee9b69f96a1e92176ebf8905a..495bdc4a23dab7a06850814bcf50de559cc1335e 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1509,6 +1509,19 @@ static inline void __generic_make_request(struct bio *bio)
                if (bio_check_eod(bio, nr_sectors))
                        goto end_io;
 
+               /*
+                * Filter flush bio's early so that make_request based
+                * drivers without flush support don't have to worry
+                * about them.
+                */
+               if ((bio->bi_rw & (REQ_FLUSH | REQ_FUA)) && !q->flush_flags) {
+                       bio->bi_rw &= ~(REQ_FLUSH | REQ_FUA);
+                       if (!nr_sectors) {
+                               err = 0;
+                               goto end_io;
+                       }
+               }
+
                if ((bio->bi_rw & REQ_DISCARD) &&
                    (!blk_queue_discard(q) ||
                     ((bio->bi_rw & REQ_SECURE) &&