Commit c0613c1c authored by Geert Uytterhoeven's avatar Geert Uytterhoeven Committed by Jens Axboe

Documentation/block/barrier.txt is not in sync with the actual code: -...

Documentation/block/barrier.txt is not in sync with the actual code: - blk_queue_ordered() no longer has a gfp_mask parameter - blk_queue_ordered_locked() no longer exists - sd_prepare_flush() looks slightly different
Signed-off-by: default avatarGeert Uytterhoeven <>
Acked-by: default avatarTejun Heo <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarJens Axboe <>
parent 70cee26e
......@@ -82,23 +82,12 @@ including draining and flushing.
typedef void (prepare_flush_fn)(request_queue_t *q, struct request *rq);
int blk_queue_ordered(request_queue_t *q, unsigned ordered,
prepare_flush_fn *prepare_flush_fn,
unsigned gfp_mask);
int blk_queue_ordered_locked(request_queue_t *q, unsigned ordered,
prepare_flush_fn *prepare_flush_fn,
unsigned gfp_mask);
The only difference between the two functions is whether or not the
caller is holding q->queue_lock on entry. The latter expects the
caller is holding the lock.
prepare_flush_fn *prepare_flush_fn);
@q : the queue in question
@ordered : the ordered mode the driver/device supports
@prepare_flush_fn : this function should prepare @rq such that it
flushes cache to physical medium when executed
@gfp_mask : gfp_mask used when allocating data structures
for ordered processing
For example, SCSI disk driver's prepare_flush_fn looks like the
......@@ -106,9 +95,10 @@ following.
static void sd_prepare_flush(request_queue_t *q, struct request *rq)
memset(rq->cmd, 0, sizeof(rq->cmd));
rq->flags |= REQ_BLOCK_PC;
rq->cmd_type = REQ_TYPE_BLOCK_PC;
rq->timeout = SD_TIMEOUT;
rq->cmd_len = 10;
The following seven ordered modes are supported. The following table
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