From patchwork Fri Aug 4 11:46:10 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andreas Hindborg X-Patchwork-Id: 13341717 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DC9E1C00528 for ; Fri, 4 Aug 2023 11:46:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230356AbjHDLqZ (ORCPT ); Fri, 4 Aug 2023 07:46:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45140 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229559AbjHDLqX (ORCPT ); Fri, 4 Aug 2023 07:46:23 -0400 Received: from mail-lf1-x135.google.com (mail-lf1-x135.google.com [IPv6:2a00:1450:4864:20::135]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8D44413D for ; Fri, 4 Aug 2023 04:46:16 -0700 (PDT) Received: by mail-lf1-x135.google.com with SMTP id 2adb3069b0e04-4fe2de785e7so3482030e87.1 for ; Fri, 04 Aug 2023 04:46:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=metaspace-dk.20221208.gappssmtp.com; s=20221208; t=1691149575; x=1691754375; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=wKIwrR5BN59/V8LhHC/Djv2VeOrVQgGtFQtn+MQpMwI=; b=sHkEZH0wPd74VY6+fxBMKePqG/hDmXbquNnubxjSEz9T0JdYHpgxTCLSjnIbJotnp2 8R+JcBH1TLXZXyxhsyJKjnGj8wQ1hHHqiFevjHWN5ozw9idtWu+mA74d05qwcGSFchcF basL3L3yBRKoHpAiBz2Y9LT3DdoEuXp1guNMgCLrmGGHoGteF/E+0Sl2ReZ3zf+lffBU NIeBgz4HYMFLX9muKLfRWqDmJtnPx3xLYWa+WBTUNAC6K4COOg9OCwIJR6iRrguadBs+ 4IABQkpm3ozXcYg9vCx9i7dTVAUhFTc1eRZuxro5idPitW6DGSfN/zUei+93NhIF8BCW D/Ew== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691149575; x=1691754375; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=wKIwrR5BN59/V8LhHC/Djv2VeOrVQgGtFQtn+MQpMwI=; b=STvQxatz1/RIQ1Z4+/92ebMi0+KvVlxY3a8qVrFrHwr5vyS3drwVDgv7G0eR0TDNHY RR0a81FLiVDwvvmQqll6iizzZzYdYJuLg8V3nDkOPFH7dlJxQKL7XgeEtg2Q5hDHZVvA kj57V8o6kbNMM/Tm8GtsZPK4pomSxbW2o5OnLoE16KQePJpPnXEknLlUfyHfhFlgbRKT 8cGw7H3PTUzpqgE6BEQUGzSHV1wCoS/YpjfNcfumERfx/C5B1haol2aQNshQO7zcRxOX yeXOIuekT50R7GSG6vfdpGYhc3633INs4lCWJcfhP3FoonWAs5I8Tccg8JsmrODVjkuA IqrQ== X-Gm-Message-State: AOJu0Yyd7r7spUxOdtMUceP/DYT6viVDL1wO+bJ2aihy7rFnekwUYRJH HlRQmvDtXilvxuJC+wo3WGwvYA== X-Google-Smtp-Source: AGHT+IGiV7SXPUPfsuoa/BpnF/yfFS11P84EaqAG3oVZHI0EsPgITJ4jpF3XTB28ROM4I3by77qojg== X-Received: by 2002:a05:6512:32b3:b0:4f8:4719:1f4a with SMTP id q19-20020a05651232b300b004f847191f4amr1147847lfe.7.1691149574639; Fri, 04 Aug 2023 04:46:14 -0700 (PDT) Received: from localhost ([194.62.217.4]) by smtp.gmail.com with ESMTPSA id m1-20020a50ef01000000b00522bfd930dcsm1140172eds.33.2023.08.04.04.46.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Aug 2023 04:46:14 -0700 (PDT) From: "Andreas Hindborg (Samsung)" To: Ming Lei Cc: Aravind Ramesh , Christoph Hellwig , gost.dev@samsung.com, Minwoo Im , Hans Holmberg , Matias Bjorling , Damien Le Moal , Andreas Hindborg , Johannes Thumshirn , linux-kernel@vger.kernel.org (open list), Jens Axboe , linux-block@vger.kernel.org (open list:BLOCK LAYER) Subject: [PATCH v11 3/3] ublk: enable zoned storage support Date: Fri, 4 Aug 2023 13:46:10 +0200 Message-ID: <20230804114610.179530-4-nmi@metaspace.dk> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230804114610.179530-1-nmi@metaspace.dk> References: <20230804114610.179530-1-nmi@metaspace.dk> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Andreas Hindborg Add zoned storage support to ublk: report_zones and operations: - REQ_OP_ZONE_OPEN - REQ_OP_ZONE_CLOSE - REQ_OP_ZONE_FINISH - REQ_OP_ZONE_RESET - REQ_OP_ZONE_APPEND The zone append feature uses the `addr` field of `struct ublksrv_io_cmd` to communicate ALBA back to the kernel. Therefore ublk must be used with the user copy feature (UBLK_F_USER_COPY) for zoned storage support to be available. Without this feature, ublk will not allow zoned storage support. Signed-off-by: Andreas Hindborg Reviewed-by: Ming Lei Tested-by: Ming Lei --- drivers/block/ublk_drv.c | 331 ++++++++++++++++++++++++++++++++-- include/uapi/linux/ublk_cmd.h | 63 ++++++- 2 files changed, 370 insertions(+), 24 deletions(-) diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index 5dba4b27d820..85a81ee556d5 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -56,16 +56,21 @@ | UBLK_F_USER_RECOVERY_REISSUE \ | UBLK_F_UNPRIVILEGED_DEV \ | UBLK_F_CMD_IOCTL_ENCODE \ - | UBLK_F_USER_COPY) + | UBLK_F_USER_COPY \ + | UBLK_F_ZONED) /* All UBLK_PARAM_TYPE_* should be included here */ -#define UBLK_PARAM_TYPE_ALL (UBLK_PARAM_TYPE_BASIC | \ - UBLK_PARAM_TYPE_DISCARD | UBLK_PARAM_TYPE_DEVT) +#define UBLK_PARAM_TYPE_ALL \ + (UBLK_PARAM_TYPE_BASIC | UBLK_PARAM_TYPE_DISCARD | \ + UBLK_PARAM_TYPE_DEVT | UBLK_PARAM_TYPE_ZONED) struct ublk_rq_data { struct llist_node node; struct kref ref; + __u64 sector; + __u32 operation; + __u32 nr_zones; }; struct ublk_uring_cmd_pdu { @@ -185,11 +190,263 @@ struct ublk_params_header { __u32 types; }; +static inline unsigned int ublk_req_build_flags(struct request *req); +static inline struct ublksrv_io_desc *ublk_get_iod(struct ublk_queue *ubq, + int tag); + static inline bool ublk_dev_is_user_copy(const struct ublk_device *ub) { return ub->dev_info.flags & UBLK_F_USER_COPY; } +static inline bool ublk_dev_is_zoned(const struct ublk_device *ub) +{ + return ub->dev_info.flags & UBLK_F_ZONED; +} + +static inline bool ublk_queue_is_zoned(struct ublk_queue *ubq) +{ + return ubq->flags & UBLK_F_ZONED; +} + +#ifdef CONFIG_BLK_DEV_ZONED + +static int ublk_get_nr_zones(const struct ublk_device *ub) +{ + const struct ublk_param_basic *p = &ub->params.basic; + + /* Zone size is a power of 2 */ + return p->dev_sectors >> ilog2(p->chunk_sectors); +} + +static int ublk_revalidate_disk_zones(struct ublk_device *ub) +{ + return blk_revalidate_disk_zones(ub->ub_disk, NULL); +} + +static int ublk_dev_param_zoned_validate(const struct ublk_device *ub) +{ + const struct ublk_param_zoned *p = &ub->params.zoned; + int nr_zones; + + if (!ublk_dev_is_zoned(ub)) + return -EINVAL; + + if (!p->max_zone_append_sectors) + return -EINVAL; + + nr_zones = ublk_get_nr_zones(ub); + + if (p->max_active_zones > nr_zones) + return -EINVAL; + + if (p->max_open_zones > nr_zones) + return -EINVAL; + + return 0; +} + +static int ublk_dev_param_zoned_apply(struct ublk_device *ub) +{ + const struct ublk_param_zoned *p = &ub->params.zoned; + + disk_set_zoned(ub->ub_disk, BLK_ZONED_HM); + blk_queue_required_elevator_features(ub->ub_disk->queue, + ELEVATOR_F_ZBD_SEQ_WRITE); + disk_set_max_active_zones(ub->ub_disk, p->max_active_zones); + disk_set_max_open_zones(ub->ub_disk, p->max_open_zones); + blk_queue_max_zone_append_sectors(ub->ub_disk->queue, p->max_zone_append_sectors); + + ub->ub_disk->nr_zones = ublk_get_nr_zones(ub); + + return 0; +} + +/* Based on virtblk_alloc_report_buffer */ +static void *ublk_alloc_report_buffer(struct ublk_device *ublk, + unsigned int nr_zones, size_t *buflen) +{ + struct request_queue *q = ublk->ub_disk->queue; + size_t bufsize; + void *buf; + + nr_zones = min_t(unsigned int, nr_zones, + ublk->ub_disk->nr_zones); + + bufsize = nr_zones * sizeof(struct blk_zone); + bufsize = + min_t(size_t, bufsize, queue_max_hw_sectors(q) << SECTOR_SHIFT); + + while (bufsize >= sizeof(struct blk_zone)) { + buf = kvmalloc(bufsize, GFP_KERNEL | __GFP_NORETRY); + if (buf) { + *buflen = bufsize; + return buf; + } + bufsize >>= 1; + } + + *buflen = 0; + return NULL; +} + +static int ublk_report_zones(struct gendisk *disk, sector_t sector, + unsigned int nr_zones, report_zones_cb cb, void *data) +{ + struct ublk_device *ub = disk->private_data; + unsigned int zone_size_sectors = disk->queue->limits.chunk_sectors; + unsigned int first_zone = sector >> ilog2(zone_size_sectors); + unsigned int done_zones = 0; + unsigned int max_zones_per_request; + int ret; + struct blk_zone *buffer; + size_t buffer_length; + + nr_zones = min_t(unsigned int, ub->ub_disk->nr_zones - first_zone, + nr_zones); + + buffer = ublk_alloc_report_buffer(ub, nr_zones, &buffer_length); + if (!buffer) + return -ENOMEM; + + max_zones_per_request = buffer_length / sizeof(struct blk_zone); + + while (done_zones < nr_zones) { + unsigned int remaining_zones = nr_zones - done_zones; + unsigned int zones_in_request = + min_t(unsigned int, remaining_zones, max_zones_per_request); + struct request *req; + struct ublk_rq_data *pdu; + blk_status_t status; + + memset(buffer, 0, buffer_length); + + req = blk_mq_alloc_request(disk->queue, REQ_OP_DRV_IN, 0); + if (IS_ERR(req)) { + ret = PTR_ERR(req); + goto out; + } + + pdu = blk_mq_rq_to_pdu(req); + pdu->operation = UBLK_IO_OP_REPORT_ZONES; + pdu->sector = sector; + pdu->nr_zones = zones_in_request; + + ret = blk_rq_map_kern(disk->queue, req, buffer, buffer_length, + GFP_KERNEL); + if (ret) { + blk_mq_free_request(req); + goto out; + } + + status = blk_execute_rq(req, 0); + ret = blk_status_to_errno(status); + blk_mq_free_request(req); + if (ret) + goto out; + + for (unsigned int i = 0; i < zones_in_request; i++) { + struct blk_zone *zone = buffer + i; + + /* A zero length zone means no more zones in this response */ + if (!zone->len) + break; + + ret = cb(zone, i, data); + if (ret) + goto out; + + done_zones++; + sector += zone_size_sectors; + + } + } + + ret = done_zones; + +out: + kvfree(buffer); + return ret; +} + +static blk_status_t ublk_setup_iod_zoned(struct ublk_queue *ubq, + struct request *req) +{ + struct ublksrv_io_desc *iod = ublk_get_iod(ubq, req->tag); + struct ublk_io *io = &ubq->ios[req->tag]; + struct ublk_rq_data *pdu = blk_mq_rq_to_pdu(req); + u32 ublk_op; + + switch (req_op(req)) { + case REQ_OP_ZONE_OPEN: + ublk_op = UBLK_IO_OP_ZONE_OPEN; + break; + case REQ_OP_ZONE_CLOSE: + ublk_op = UBLK_IO_OP_ZONE_CLOSE; + break; + case REQ_OP_ZONE_FINISH: + ublk_op = UBLK_IO_OP_ZONE_FINISH; + break; + case REQ_OP_ZONE_RESET: + ublk_op = UBLK_IO_OP_ZONE_RESET; + break; + case REQ_OP_ZONE_APPEND: + ublk_op = UBLK_IO_OP_ZONE_APPEND; + break; + case REQ_OP_DRV_IN: + ublk_op = pdu->operation; + switch (ublk_op) { + case UBLK_IO_OP_REPORT_ZONES: + iod->op_flags = ublk_op | ublk_req_build_flags(req); + iod->nr_zones = pdu->nr_zones; + iod->start_sector = pdu->sector; + return BLK_STS_OK; + default: + return BLK_STS_IOERR; + } + case REQ_OP_ZONE_RESET_ALL: + case REQ_OP_DRV_OUT: + /* We do not support reset_all and drv_out */ + return BLK_STS_NOTSUPP; + default: + return BLK_STS_IOERR; + } + + iod->op_flags = ublk_op | ublk_req_build_flags(req); + iod->nr_sectors = blk_rq_sectors(req); + iod->start_sector = blk_rq_pos(req); + iod->addr = io->addr; + + return BLK_STS_OK; +} + +#else + +#define ublk_report_zones (NULL) + +static int ublk_dev_param_zoned_validate(const struct ublk_device *ub) +{ + return -EOPNOTSUPP; +} + +static int ublk_dev_param_zoned_apply(struct ublk_device *ub) +{ + return -EOPNOTSUPP; +} + +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) +{ + return -EOPNOTSUPP; +} + +#endif + static inline void __ublk_complete_rq(struct request *req); static void ublk_complete_rq(struct kref *ref); @@ -286,6 +543,9 @@ static int ublk_validate_params(const struct ublk_device *ub) if (p->max_sectors > (ub->dev_info.max_io_buf_bytes >> 9)) return -EINVAL; + + if (ublk_dev_is_zoned(ub) && !p->chunk_sectors) + return -EINVAL; } else return -EINVAL; @@ -304,6 +564,11 @@ static int ublk_validate_params(const struct ublk_device *ub) if (ub->params.types & UBLK_PARAM_TYPE_DEVT) return -EINVAL; + if (ub->params.types & UBLK_PARAM_TYPE_ZONED) + return ublk_dev_param_zoned_validate(ub); + else if (ublk_dev_is_zoned(ub)) + return -EINVAL; + return 0; } @@ -317,6 +582,9 @@ static int ublk_apply_params(struct ublk_device *ub) if (ub->params.types & UBLK_PARAM_TYPE_DISCARD) ublk_dev_param_discard_apply(ub); + if (ub->params.types & UBLK_PARAM_TYPE_ZONED) + return ublk_dev_param_zoned_apply(ub); + return 0; } @@ -487,6 +755,7 @@ static const struct block_device_operations ub_fops = { .owner = THIS_MODULE, .open = ublk_open, .free_disk = ublk_free_disk, + .report_zones = ublk_report_zones, }; #define UBLK_MAX_PIN_PAGES 32 @@ -601,7 +870,8 @@ static inline bool ublk_need_map_req(const struct request *req) static inline bool ublk_need_unmap_req(const struct request *req) { - return ublk_rq_has_data(req) && req_op(req) == REQ_OP_READ; + return ublk_rq_has_data(req) && + (req_op(req) == REQ_OP_READ || req_op(req) == REQ_OP_DRV_IN); } static int ublk_map_io(const struct ublk_queue *ubq, const struct request *req, @@ -685,8 +955,13 @@ static blk_status_t ublk_setup_iod(struct ublk_queue *ubq, struct request *req) { struct ublksrv_io_desc *iod = ublk_get_iod(ubq, req->tag); struct ublk_io *io = &ubq->ios[req->tag]; + enum req_op op = req_op(req); u32 ublk_op; + if (!ublk_queue_is_zoned(ubq) && + (op_is_zone_mgmt(op) || op == REQ_OP_ZONE_APPEND)) + return -EIO; + switch (req_op(req)) { case REQ_OP_READ: ublk_op = UBLK_IO_OP_READ; @@ -704,6 +979,8 @@ static blk_status_t ublk_setup_iod(struct ublk_queue *ubq, struct request *req) 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; } @@ -756,7 +1033,8 @@ static inline void __ublk_complete_rq(struct request *req) * * Both the two needn't unmap. */ - if (req_op(req) != REQ_OP_READ && req_op(req) != REQ_OP_WRITE) + if (req_op(req) != REQ_OP_READ && req_op(req) != REQ_OP_WRITE && + req_op(req) != REQ_OP_DRV_IN) goto exit; /* for READ request, writing data in iod->addr to rq buffers */ @@ -1120,6 +1398,9 @@ static void ublk_commit_completion(struct ublk_device *ub, /* find the io request and complete */ req = blk_mq_tag_to_rq(ub->tag_set.tags[qid], tag); + if (req_op(req) == REQ_OP_ZONE_APPEND) + req->__sector = ub_cmd->zone_append_lba; + if (req && likely(!blk_should_fake_timeout(req->q))) ublk_put_req_ref(ubq, req); } @@ -1468,8 +1749,11 @@ static int __ublk_ch_uring_cmd(struct io_uring_cmd *cmd, if (!ub_cmd->addr && (!ublk_need_get_data(ubq) || req_op(req) == REQ_OP_READ)) goto out; - } else if (ub_cmd->addr) { - /* User copy requires addr to be unset */ + } else if (req_op(req) != REQ_OP_ZONE_APPEND && ub_cmd->addr) { + /* + * User copy requires addr to be unset when command is + * not zone append + */ ret = -EINVAL; goto out; } @@ -1546,11 +1830,14 @@ static inline bool ublk_check_ubuf_dir(const struct request *req, int ubuf_dir) { /* copy ubuf to request pages */ - if (req_op(req) == REQ_OP_READ && ubuf_dir == ITER_SOURCE) + if ((req_op(req) == REQ_OP_READ || req_op(req) == REQ_OP_DRV_IN) && + ubuf_dir == ITER_SOURCE) return true; /* copy request pages to ubuf */ - if (req_op(req) == REQ_OP_WRITE && ubuf_dir == ITER_DEST) + if ((req_op(req) == REQ_OP_WRITE || + req_op(req) == REQ_OP_ZONE_APPEND) && + ubuf_dir == ITER_DEST) return true; return false; @@ -1890,17 +2177,24 @@ static int ublk_ctrl_start_dev(struct ublk_device *ub, struct io_uring_cmd *cmd) get_device(&ub->cdev_dev); ub->dev_info.state = UBLK_S_DEV_LIVE; + + if (ublk_dev_is_zoned(ub)) { + ret = ublk_revalidate_disk_zones(ub); + if (ret) + goto out_put_cdev; + } + ret = add_disk(disk); + if (ret) + goto out_put_cdev; + + set_bit(UB_STATE_USED, &ub->state); + +out_put_cdev: if (ret) { - /* - * Has to drop the reference since ->free_disk won't be - * called in case of add_disk failure. - */ ub->dev_info.state = UBLK_S_DEV_DEAD; ublk_put_device(ub); - goto out_put_disk; } - set_bit(UB_STATE_USED, &ub->state); out_put_disk: if (ret) put_disk(disk); @@ -2050,6 +2344,13 @@ static int ublk_ctrl_add_dev(struct io_uring_cmd *cmd) if (ublk_dev_is_user_copy(ub)) ub->dev_info.flags &= ~UBLK_F_NEED_GET_DATA; + /* Zoned storage support requires user copy feature */ + if (ublk_dev_is_zoned(ub) && + (!IS_ENABLED(CONFIG_BLK_DEV_ZONED) || !ublk_dev_is_user_copy(ub))) { + ret = -EINVAL; + goto out_free_dev_number; + } + /* We are not ready to support zero copy */ ub->dev_info.flags &= ~UBLK_F_SUPPORT_ZERO_COPY; diff --git a/include/uapi/linux/ublk_cmd.h b/include/uapi/linux/ublk_cmd.h index 4b8558db90e1..2685e53e4752 100644 --- a/include/uapi/linux/ublk_cmd.h +++ b/include/uapi/linux/ublk_cmd.h @@ -176,6 +176,12 @@ /* Copy between request and user buffer by pread()/pwrite() */ #define UBLK_F_USER_COPY (1UL << 7) +/* + * User space sets this flag when setting up the device to request zoned storage support. Kernel may + * deny the request by returning an error. + */ +#define UBLK_F_ZONED (1ULL << 8) + /* device state */ #define UBLK_S_DEV_DEAD 0 #define UBLK_S_DEV_LIVE 1 @@ -232,9 +238,26 @@ struct ublksrv_ctrl_dev_info { #define UBLK_IO_OP_READ 0 #define UBLK_IO_OP_WRITE 1 #define UBLK_IO_OP_FLUSH 2 -#define UBLK_IO_OP_DISCARD 3 -#define UBLK_IO_OP_WRITE_SAME 4 -#define UBLK_IO_OP_WRITE_ZEROES 5 +#define UBLK_IO_OP_DISCARD 3 +#define UBLK_IO_OP_WRITE_SAME 4 +#define UBLK_IO_OP_WRITE_ZEROES 5 +#define UBLK_IO_OP_ZONE_OPEN 10 +#define UBLK_IO_OP_ZONE_CLOSE 11 +#define UBLK_IO_OP_ZONE_FINISH 12 +#define UBLK_IO_OP_ZONE_APPEND 13 +#define UBLK_IO_OP_ZONE_RESET 15 +/* + * Construct a zone report. The report request is carried in `struct + * ublksrv_io_desc`. The `start_sector` field must be the first sector of a zone + * and shall indicate the first zone of the report. The `nr_zones` shall + * indicate how many zones should be reported at most. The report shall be + * delivered as a `struct blk_zone` array. To report fewer zones than requested, + * zero the last entry of the returned array. + * + * Related definitions(blk_zone, blk_zone_cond, blk_zone_type, ...) in + * include/uapi/linux/blkzoned.h are part of ublk UAPI. + */ +#define UBLK_IO_OP_REPORT_ZONES 18 #define UBLK_IO_F_FAILFAST_DEV (1U << 8) #define UBLK_IO_F_FAILFAST_TRANSPORT (1U << 9) @@ -255,7 +278,10 @@ struct ublksrv_io_desc { /* op: bit 0-7, flags: bit 8-31 */ __u32 op_flags; - __u32 nr_sectors; + union { + __u32 nr_sectors; + __u32 nr_zones; /* for UBLK_IO_OP_REPORT_ZONES */ + }; /* start sector for this io */ __u64 start_sector; @@ -284,11 +310,21 @@ struct ublksrv_io_cmd { /* io result, it is valid for COMMIT* command only */ __s32 result; - /* - * userspace buffer address in ublksrv daemon process, valid for - * FETCH* command only - */ - __u64 addr; + union { + /* + * userspace buffer address in ublksrv daemon process, valid for + * FETCH* command only + * + * `addr` should not be used when UBLK_F_USER_COPY is enabled, + * because userspace handles data copy by pread()/pwrite() over + * /dev/ublkcN. But in case of UBLK_F_ZONED, this union is + * re-used to pass back the allocated LBA for + * UBLK_IO_OP_ZONE_APPEND which actually depends on + * UBLK_F_USER_COPY + */ + __u64 addr; + __u64 zone_append_lba; + }; }; struct ublk_param_basic { @@ -331,6 +367,13 @@ struct ublk_param_devt { __u32 disk_minor; }; +struct ublk_param_zoned { + __u32 max_open_zones; + __u32 max_active_zones; + __u32 max_zone_append_sectors; + __u8 reserved[20]; +}; + struct ublk_params { /* * Total length of parameters, userspace has to set 'len' for both @@ -342,11 +385,13 @@ struct ublk_params { #define UBLK_PARAM_TYPE_BASIC (1 << 0) #define UBLK_PARAM_TYPE_DISCARD (1 << 1) #define UBLK_PARAM_TYPE_DEVT (1 << 2) +#define UBLK_PARAM_TYPE_ZONED (1 << 3) __u32 types; /* types of parameter included */ struct ublk_param_basic basic; struct ublk_param_discard discard; struct ublk_param_devt devt; + struct ublk_param_zoned zoned; }; #endif