From patchwork Wed Apr 5 14:21:39 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 9664313 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id EBF06602B5 for ; Wed, 5 Apr 2017 14:24:24 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DFCE81FFDB for ; Wed, 5 Apr 2017 14:24:24 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D475D28307; Wed, 5 Apr 2017 14:24:24 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 538AB1FFDB for ; Wed, 5 Apr 2017 14:24:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932888AbdDEOYW (ORCPT ); Wed, 5 Apr 2017 10:24:22 -0400 Received: from bombadil.infradead.org ([65.50.211.133]:53336 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755000AbdDEOWQ (ORCPT ); Wed, 5 Apr 2017 10:22:16 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=References:In-Reply-To:Message-Id: Date:Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=GSWBNvbJteVSnKHNzSxeOXD9liMqgGFw6HtlhaMmgCQ=; b=rehZEEYgSYVUCXCvqBDuxx3E/ RVB7S1fTPZaT1KDoSp73j+0gxdklMgOmTSxehJxRT1l1bDCjX/lsR2Qnd5m3po0q6E/o5xpslYroN csICdB199K2B0q68Y4DfY74yZh5ktorE1eGD+JafO8IR658XOUxiU4k9SNmR0Da9/asE1HLAMjLLd ZPrG/gdwNZ7wGtfOmkr2jCaKxJlordDkjpyKy9enoFaA3XzCjzszOf1HPdZknyYeh6C6lou2JYAB8 2qpOkbZOnwStx73/DRbKhrHoYYqLGvLt5clIgAbszGwYu7GWrA2AEE0kvk6TBP0L8TjvcWS2dGd3M MA89PMhEA==; Received: from 80-109-146-114.cable.dynamic.surfer.at ([80.109.146.114] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.87 #1 (Red Hat Linux)) id 1cvlp5-0002wJ-EK; Wed, 05 Apr 2017 14:22:12 +0000 From: Christoph Hellwig To: axboe@kernel.dk, martin.petersen@oracle.com, agk@redhat.com, snitzer@redhat.com, shli@kernel.org, philipp.reisner@linbit.com, lars.ellenberg@linbit.com Cc: linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, drbd-dev@lists.linbit.com, dm-devel@redhat.com, linux-raid@vger.kernel.org Subject: [PATCH 01/27] sd: split sd_setup_discard_cmnd Date: Wed, 5 Apr 2017 16:21:39 +0200 Message-Id: <20170405142205.6477-2-hch@lst.de> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170405142205.6477-1-hch@lst.de> References: <20170405142205.6477-1-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html 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 Split sd_setup_discard_cmnd into one function per provisioning type. While this creates some very slight duplication of boilerplate code it keeps the code modular for additions of new provisioning types, and for reusing the write same functions for the upcoming scsi implementation of the Write Zeroes operation. Signed-off-by: Christoph Hellwig Reviewed-by: Martin K. Petersen Reviewed-by: Hannes Reinecke --- drivers/scsi/sd.c | 153 ++++++++++++++++++++++++++++++------------------------ 1 file changed, 84 insertions(+), 69 deletions(-) diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index fcfeddc79331..b853f91fb3da 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -701,93 +701,97 @@ static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode) queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); } -/** - * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device - * @sdp: scsi device to operate on - * @rq: Request to prepare - * - * Will issue either UNMAP or WRITE SAME(16) depending on preference - * indicated by target device. - **/ -static int sd_setup_discard_cmnd(struct scsi_cmnd *cmd) +static int sd_setup_unmap_cmnd(struct scsi_cmnd *cmd) { - struct request *rq = cmd->request; struct scsi_device *sdp = cmd->device; - struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); - sector_t sector = blk_rq_pos(rq); - unsigned int nr_sectors = blk_rq_sectors(rq); - unsigned int len; - int ret; + struct request *rq = cmd->request; + u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9); + u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9); + unsigned int data_len = 24; char *buf; - struct page *page; - sector >>= ilog2(sdp->sector_size) - 9; - nr_sectors >>= ilog2(sdp->sector_size) - 9; - - page = alloc_page(GFP_ATOMIC | __GFP_ZERO); - if (!page) + rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO); + if (!rq->special_vec.bv_page) return BLKPREP_DEFER; + rq->special_vec.bv_offset = 0; + rq->special_vec.bv_len = data_len; + rq->rq_flags |= RQF_SPECIAL_PAYLOAD; - switch (sdkp->provisioning_mode) { - case SD_LBP_UNMAP: - buf = page_address(page); - - cmd->cmd_len = 10; - cmd->cmnd[0] = UNMAP; - cmd->cmnd[8] = 24; - - put_unaligned_be16(6 + 16, &buf[0]); - put_unaligned_be16(16, &buf[2]); - put_unaligned_be64(sector, &buf[8]); - put_unaligned_be32(nr_sectors, &buf[16]); + cmd->cmd_len = 10; + cmd->cmnd[0] = UNMAP; + cmd->cmnd[8] = 24; - len = 24; - break; + buf = page_address(rq->special_vec.bv_page); + put_unaligned_be16(6 + 16, &buf[0]); + put_unaligned_be16(16, &buf[2]); + put_unaligned_be64(sector, &buf[8]); + put_unaligned_be32(nr_sectors, &buf[16]); - case SD_LBP_WS16: - cmd->cmd_len = 16; - cmd->cmnd[0] = WRITE_SAME_16; - cmd->cmnd[1] = 0x8; /* UNMAP */ - put_unaligned_be64(sector, &cmd->cmnd[2]); - put_unaligned_be32(nr_sectors, &cmd->cmnd[10]); + cmd->allowed = SD_MAX_RETRIES; + cmd->transfersize = data_len; + rq->timeout = SD_TIMEOUT; + scsi_req(rq)->resid_len = data_len; - len = sdkp->device->sector_size; - break; + return scsi_init_io(cmd); +} - case SD_LBP_WS10: - case SD_LBP_ZERO: - cmd->cmd_len = 10; - cmd->cmnd[0] = WRITE_SAME; - if (sdkp->provisioning_mode == SD_LBP_WS10) - cmd->cmnd[1] = 0x8; /* UNMAP */ - put_unaligned_be32(sector, &cmd->cmnd[2]); - put_unaligned_be16(nr_sectors, &cmd->cmnd[7]); +static int sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd) +{ + struct scsi_device *sdp = cmd->device; + struct request *rq = cmd->request; + u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9); + u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9); + u32 data_len = sdp->sector_size; - len = sdkp->device->sector_size; - break; + rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO); + if (!rq->special_vec.bv_page) + return BLKPREP_DEFER; + rq->special_vec.bv_offset = 0; + rq->special_vec.bv_len = data_len; + rq->rq_flags |= RQF_SPECIAL_PAYLOAD; - default: - ret = BLKPREP_INVALID; - goto out; - } + cmd->cmd_len = 16; + cmd->cmnd[0] = WRITE_SAME_16; + cmd->cmnd[1] = 0x8; /* UNMAP */ + put_unaligned_be64(sector, &cmd->cmnd[2]); + put_unaligned_be32(nr_sectors, &cmd->cmnd[10]); + cmd->allowed = SD_MAX_RETRIES; + cmd->transfersize = data_len; rq->timeout = SD_TIMEOUT; + scsi_req(rq)->resid_len = data_len; - cmd->transfersize = len; - cmd->allowed = SD_MAX_RETRIES; + return scsi_init_io(cmd); +} - rq->special_vec.bv_page = page; - rq->special_vec.bv_offset = 0; - rq->special_vec.bv_len = len; +static int sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd, bool unmap) +{ + struct scsi_device *sdp = cmd->device; + struct request *rq = cmd->request; + u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9); + u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9); + u32 data_len = sdp->sector_size; + rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO); + if (!rq->special_vec.bv_page) + return BLKPREP_DEFER; + rq->special_vec.bv_offset = 0; + rq->special_vec.bv_len = data_len; rq->rq_flags |= RQF_SPECIAL_PAYLOAD; - scsi_req(rq)->resid_len = len; - ret = scsi_init_io(cmd); -out: - if (ret != BLKPREP_OK) - __free_page(page); - return ret; + cmd->cmd_len = 10; + cmd->cmnd[0] = WRITE_SAME; + if (unmap) + cmd->cmnd[1] = 0x8; /* UNMAP */ + put_unaligned_be32(sector, &cmd->cmnd[2]); + put_unaligned_be16(nr_sectors, &cmd->cmnd[7]); + + cmd->allowed = SD_MAX_RETRIES; + cmd->transfersize = data_len; + rq->timeout = SD_TIMEOUT; + scsi_req(rq)->resid_len = data_len; + + return scsi_init_io(cmd); } static void sd_config_write_same(struct scsi_disk *sdkp) @@ -1155,7 +1159,18 @@ static int sd_init_command(struct scsi_cmnd *cmd) switch (req_op(rq)) { case REQ_OP_DISCARD: - return sd_setup_discard_cmnd(cmd); + switch (scsi_disk(rq->rq_disk)->provisioning_mode) { + case SD_LBP_UNMAP: + return sd_setup_unmap_cmnd(cmd); + case SD_LBP_WS16: + return sd_setup_write_same16_cmnd(cmd); + case SD_LBP_WS10: + return sd_setup_write_same10_cmnd(cmd, true); + case SD_LBP_ZERO: + return sd_setup_write_same10_cmnd(cmd, false); + default: + return BLKPREP_INVALID; + } case REQ_OP_WRITE_SAME: return sd_setup_write_same_cmnd(cmd); case REQ_OP_FLUSH: