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block, drivers: add REQ_OP_FLUSH operation

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This adds a REQ_OP_FLUSH operation that is sent to request_fn
based drivers by the block layer's flush code, instead of
sending requests with the request->cmd_flags REQ_FLUSH bit set.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Mike Christie 2016-06-05 14:32:23 -05:00 • committed by Jens Axboe
parent 4e1b2d52a8
commit 3a5e02ced1
20 changed files with 40 additions and 31 deletions
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5
kernel/trace/blktrace.c
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@ -223,6 +223,8 @@ static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
what |= MASK_TC_BIT(op_flags, FUA);
if (op == REQ_OP_DISCARD)
what |= BLK_TC_ACT(BLK_TC_DISCARD);
if (op == REQ_OP_FLUSH)
what |= BLK_TC_ACT(BLK_TC_FLUSH);
pid = tsk->pid;
if (act_log_check(bt, what, sector, pid))
@ -1788,6 +1790,9 @@ void blk_fill_rwbs(char *rwbs, int op, u32 rw, int bytes)
case REQ_OP_DISCARD:
rwbs[i++] = 'D';
break;
case REQ_OP_FLUSH:
rwbs[i++] = 'F';
break;
case REQ_OP_READ:
rwbs[i++] = 'R';
break;