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20:d2SZjwsX0rbnQPudokT13g+Q82k6BIH2/IIjI+EnrfrnNqvrgvH6GUORE1Y98dNqs1ky8pnlQ/4C4s5S6zLhbRXViqYaI81qExKxrG+DclyO1zTnlQEaH29FgUyDbgHfaU5ijSWDa/DQn36A3WNIcXIDTBbFG7VpQqO7pQn8Kmg= X-OriginatorOrg: sandisk.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 May 2017 18:30:21.9267 (UTC) X-MS-Exchange-CrossTenant-Id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=b61c8803-16f3-4c35-9b17-6f65f441df86; Ip=[63.163.107.21]; Helo=[milsmgep15.sandisk.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR04MB0355 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Several block drivers need to initialize the driver-private data after having called blk_get_request() and before .prep_rq_fn() is called, e.g. when submitting a REQ_OP_SCSI_* request. Avoid that that initialization code has to be repeated after every blk_get_request() call by adding a new callback function to struct request_queue. Signed-off-by: Bart Van Assche Cc: Jens Axboe Cc: Christoph Hellwig Cc: Omar Sandoval Cc: Hannes Reinecke Cc: linux-block@vger.kernel.org --- block/blk-core.c | 3 +++ block/blk-mq.c | 3 +++ include/linux/blkdev.h | 4 ++++ 3 files changed, 10 insertions(+) diff --git a/block/blk-core.c b/block/blk-core.c index a69d420b7ff0..f2540d164679 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -126,6 +126,9 @@ void blk_rq_init(struct request_queue *q, struct request *rq) rq->start_time = jiffies; set_start_time_ns(rq); rq->part = NULL; + + if (q->initialize_rq_fn) + q->initialize_rq_fn(rq); } EXPORT_SYMBOL(blk_rq_init); diff --git a/block/blk-mq.c b/block/blk-mq.c index a69ad122ed66..2af43d4e5b96 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -241,6 +241,9 @@ void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx, rq->end_io_data = NULL; rq->next_rq = NULL; + if (q->initialize_rq_fn) + q->initialize_rq_fn(rq); + ctx->rq_dispatched[op_is_sync(op)]++; } EXPORT_SYMBOL_GPL(blk_mq_rq_ctx_init); diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 75b71374e1ba..2ee8da93619d 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -410,8 +410,12 @@ struct request_queue { rq_timed_out_fn *rq_timed_out_fn; dma_drain_needed_fn *dma_drain_needed; lld_busy_fn *lld_busy_fn; + /* Called just after a request is allocated */ init_rq_fn *init_rq_fn; + /* Called just before a request is freed */ exit_rq_fn *exit_rq_fn; + /* Called from inside blk_get_request() */ + void (*initialize_rq_fn)(struct request *rq); const struct blk_mq_ops *mq_ops;