From patchwork Tue Aug 4 07:11:08 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 6934431 Return-Path: X-Original-To: patchwork-linux-scsi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 5F2FE9F39D for ; Tue, 4 Aug 2015 07:16:00 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 6BBAD20620 for ; Tue, 4 Aug 2015 07:15:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6B0D520619 for ; Tue, 4 Aug 2015 07:15:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754094AbbHDHO1 (ORCPT ); Tue, 4 Aug 2015 03:14:27 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:48007 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753321AbbHDHOK (ORCPT ); Tue, 4 Aug 2015 03:14:10 -0400 Received: from 212095007091.public.telering.at ([212.95.7.91] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZMWQL-0008OZ-A4; Tue, 04 Aug 2015 07:14:09 +0000 From: Christoph Hellwig To: Jens Axboe Cc: linux-scsi@vger.kernel.org, linux-nvme@lists.infradead.org, dm-devel@redhat.com, linux-api@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 3/6] sd: implement the persisten reservation API Date: Tue, 4 Aug 2015 09:11:08 +0200 Message-Id: <1438672271-11309-4-git-send-email-hch@lst.de> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1438672271-11309-1-git-send-email-hch@lst.de> References: <1438672271-11309-1-git-send-email-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Spam-Status: No, score=-7.0 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Signed-off-by: Christoph Hellwig Reviewed-by: Martin K. Petersen --- drivers/scsi/sd.c | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 90 insertions(+) diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 160e44e..e9bc210 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -51,6 +51,7 @@ #include #include #include +#include #include #include @@ -1535,6 +1536,94 @@ static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, } #endif +static char sd_pr_type(enum pr_type type) +{ + switch (type) { + case PR_WRITE_EXCLUSIVE: + return 0x01; + case PR_EXCLUSIVE_ACCESS: + return 0x03; + case PR_WRITE_EXCLUSIVE_REG_ONLY: + return 0x05; + case PR_EXCLUSIVE_ACCESS_REG_ONLY: + return 0x06; + case PR_WRITE_EXCLUSIVE_ALL_REGS: + return 0x07; + case PR_EXCLUSIVE_ACCESS_ALL_REGS: + return 0x08; + default: + return 0; + } +}; + +static int sd_pr_command(struct block_device *bdev, u8 sa, + u64 key, u64 sa_key, u8 type, u8 flags) +{ + struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; + struct scsi_sense_hdr sshdr; + int result; + u8 cmd[16] = { 0, }; + u8 data[24] = { 0, }; + + cmd[0] = PERSISTENT_RESERVE_OUT; + cmd[1] = sa; + cmd[2] = type; + put_unaligned_be32(sizeof(data), &cmd[5]); + + put_unaligned_be64(key, &data[0]); + put_unaligned_be64(sa_key, &data[8]); + data[20] = flags; + + result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data), + &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL); + + if ((driver_byte(result) & DRIVER_SENSE) && + (scsi_sense_valid(&sshdr))) { + sdev_printk(KERN_INFO, sdev, "PR commad failed: %d\n", result); + scsi_print_sense_hdr(sdev, NULL, &sshdr); + } + + return result; +} + +static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key, + bool ignore) +{ + return sd_pr_command(bdev, ignore ? 0x06 : 0x00, old_key, new_key, 0, + (1 << 0) /* APTPL */ | + (1 << 2) /* ALL_TG_PT */); +} + +static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type) +{ + return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0); +} + +static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type) +{ + return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0); +} + +static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key, + enum pr_type type, bool abort) +{ + return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key, + sd_pr_type(type), 0); +} + +static int sd_pr_clear(struct block_device *bdev, u64 key) +{ + return sd_pr_command(bdev, 0x03, key, 0, 0, 0); +} + +static const struct pr_ops sd_pr_ops = { + .pr_register = sd_pr_register, + .pr_reserve = sd_pr_reserve, + .pr_release = sd_pr_release, + .pr_preempt = sd_pr_preempt, + .pr_clear = sd_pr_clear, +}; + static const struct block_device_operations sd_fops = { .owner = THIS_MODULE, .open = sd_open, @@ -1547,6 +1636,7 @@ static const struct block_device_operations sd_fops = { .check_events = sd_check_events, .revalidate_disk = sd_revalidate_disk, .unlock_native_capacity = sd_unlock_native_capacity, + .pr_ops = &sd_pr_ops, }; /**