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Tue, 28 Jul 2026 18:30:05 -0700 (PDT) X-Relaying-Domain: purestorage.com Received: from dev-csander.dev.purestorage.com (bond0.slc5-n17m28-k8s.dev.purestorage.com [IPv6:2620:125:9025:20::a31:41f]) by c7-smtp-2026.dev.purestorage.com (Postfix) with ESMTP id 6084C4043D; Tue, 28 Jul 2026 19:30:04 -0600 (MDT) Received: by dev-csander.dev.purestorage.com (Postfix, from userid 1557716354) id 5D9FCE40442; Tue, 28 Jul 2026 19:30:04 -0600 (MDT) From: Caleb Sander Mateos To: Ming Lei , Jens Axboe Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Caleb Sander Mateos Subject: [PATCH 3/6] ublk: split request validation from io_desc init Date: Tue, 28 Jul 2026 19:29:48 -0600 Message-ID: <20260729012951.3744582-4-csander@purestorage.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260729012951.3744582-1-csander@purestorage.com> References: <20260729012951.3744582-1-csander@purestorage.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit In preparation for moving the struct ublksrv_io_desc initialization from the thread submitting ublk requests to the daemon thread receiving them, split the fallible part of ublk_setup_iod{,_zoned}() into new helper ublk_validate_req{,_zoned}(). Only ublk_setup_iod{,_zoned}() accesses the io_desc and cannot error out. Return a bool value from ublk_validate_req{,_zoned}() as the existing error code ublk_setup_iod{,_zoned}() returns is only checked against BLK_STS_OK. Signed-off-by: Caleb Sander Mateos --- drivers/block/ublk_drv.c | 70 +++++++++++++++++++++++++++------------- 1 file changed, 48 insertions(+), 22 deletions(-) diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index fada30d8d350..efbb0d6af128 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -698,12 +698,28 @@ static int ublk_report_zones(struct gendisk *disk, sector_t sector, out: kvfree(buffer); return ret; } -static blk_status_t ublk_setup_iod_zoned(struct ublk_queue *ubq, - struct request *req) +static bool ublk_validate_req_zoned(const struct request *req) +{ + switch (req_op(req)) { + case REQ_OP_ZONE_OPEN: + case REQ_OP_ZONE_CLOSE: + case REQ_OP_ZONE_FINISH: + case REQ_OP_ZONE_RESET: + case REQ_OP_ZONE_APPEND: + case REQ_OP_ZONE_RESET_ALL: + return true; + case REQ_OP_DRV_IN: + return !!ublk_zoned_get_report_desc(req); + default: + return false; + } +} + +static void ublk_setup_iod_zoned(struct ublk_queue *ubq, struct request *req) { struct ublk_zoned_report_desc *desc; u32 ublk_op; switch (req_op(req)) { @@ -725,24 +741,19 @@ static blk_status_t ublk_setup_iod_zoned(struct ublk_queue *ubq, case REQ_OP_ZONE_RESET_ALL: ublk_op = UBLK_IO_OP_ZONE_RESET_ALL; break; case REQ_OP_DRV_IN: desc = ublk_zoned_get_report_desc(req); - if (!desc) - return BLK_STS_IOERR; ublk_init_iod(ubq, req, UBLK_IO_OP_REPORT_ZONES, desc->nr_zones, desc->sector); - return BLK_STS_OK; - case REQ_OP_DRV_OUT: - /* We do not support drv_out */ - return BLK_STS_NOTSUPP; + return; default: - return BLK_STS_IOERR; + WARN_ON_ONCE(1); + return; } ublk_init_iod(ubq, req, ublk_op, blk_rq_sectors(req), blk_rq_pos(req)); - return BLK_STS_OK; } #else #define ublk_report_zones (NULL) @@ -759,14 +770,18 @@ static void ublk_dev_param_zoned_apply(struct ublk_device *ub) static int ublk_revalidate_disk_zones(struct ublk_device *ub) { return 0; } -static blk_status_t ublk_setup_iod_zoned(struct ublk_queue *ubq, - struct request *req) +static bool ublk_validate_req_zoned(const struct request *req) { - return BLK_STS_NOTSUPP; + return false; +} + +static void ublk_setup_iod_zoned(struct ublk_queue *ubq, struct request *req) +{ + WARN_ON_ONCE(1); } #endif static inline void __ublk_complete_rq(struct request *req, struct ublk_io *io, @@ -1489,11 +1504,26 @@ static unsigned int ublk_unmap_io(bool need_map, return ublk_copy_user_pages(req, 0, &iter, dir); } return rq_bytes; } -static blk_status_t ublk_setup_iod(struct ublk_queue *ubq, struct request *req) +static bool ublk_validate_req(const struct ublk_queue *ubq, + const struct request *req) +{ + switch (req_op(req)) { + case REQ_OP_READ: + case REQ_OP_WRITE: + case REQ_OP_FLUSH: + case REQ_OP_DISCARD: + case REQ_OP_WRITE_ZEROES: + return true; + default: + return ublk_queue_is_zoned(ubq) && ublk_validate_req_zoned(req); + } +} + +static void ublk_setup_iod(struct ublk_queue *ubq, struct request *req) { u32 ublk_op; switch (req_op(req)) { case REQ_OP_READ: @@ -1510,17 +1540,15 @@ static blk_status_t ublk_setup_iod(struct ublk_queue *ubq, struct request *req) break; case REQ_OP_WRITE_ZEROES: ublk_op = UBLK_IO_OP_WRITE_ZEROES; break; default: - if (ublk_queue_is_zoned(ubq)) - return ublk_setup_iod_zoned(ubq, req); - return BLK_STS_IOERR; + ublk_setup_iod_zoned(ubq, req); + return; } ublk_init_iod(ubq, req, ublk_op, blk_rq_sectors(req), blk_rq_pos(req)); - return BLK_STS_OK; } static inline struct ublk_uring_cmd_pdu *ublk_get_uring_cmd_pdu( struct io_uring_cmd *ioucmd) { @@ -2124,12 +2152,10 @@ static enum blk_eh_timer_return ublk_timeout(struct request *rq) } static blk_status_t ublk_prep_req(struct ublk_queue *ubq, struct request *rq, bool check_cancel) { - blk_status_t res; - if (unlikely(READ_ONCE(ubq->fail_io))) return BLK_STS_TARGET; /* With recovery feature enabled, force_abort is set in * ublk_stop_dev() before calling del_gendisk(). We have to @@ -2146,14 +2172,14 @@ static blk_status_t ublk_prep_req(struct ublk_queue *ubq, struct request *rq, if (check_cancel && unlikely(ubq->canceling)) return BLK_STS_IOERR; /* fill iod to slot in io cmd buffer */ - res = ublk_setup_iod(ubq, rq); - if (unlikely(res != BLK_STS_OK)) + if (unlikely(!ublk_validate_req(ubq, rq))) return BLK_STS_IOERR; + ublk_setup_iod(ubq, rq); blk_mq_start_request(rq); return BLK_STS_OK; } /* -- 2.54.0