From patchwork Wed Aug 12 06:23:24 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 6995961 Return-Path: X-Original-To: patchwork-linux-scsi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 98E4CC05AC for ; Wed, 12 Aug 2015 06:27:50 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id A4E7A2064F for ; Wed, 12 Aug 2015 06:27:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A4BB520676 for ; Wed, 12 Aug 2015 06:27:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933837AbbHLG1M (ORCPT ); Wed, 12 Aug 2015 02:27:12 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:47988 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933781AbbHLG1I (ORCPT ); Wed, 12 Aug 2015 02:27:08 -0400 Received: from p5de57192.dip0.t-ipconnect.de ([93.229.113.146] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZPPVD-0003nA-Hx; Wed, 12 Aug 2015 06:27:08 +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 5/5] dm: add support for passing through persistent reservations Date: Wed, 12 Aug 2015 08:23:24 +0200 Message-Id: <1439360604-16192-6-git-send-email-hch@lst.de> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1439360604-16192-1-git-send-email-hch@lst.de> References: <1439360604-16192-1-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=-6.9 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 This adds support to pass through persistent reservation requests similar to the existing ioctl handling, and with the same limitations, e.g. devices may only have a single target attached. This is mostly intended for multipathing. Signed-off-by: Christoph Hellwig --- drivers/md/dm.c | 122 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 122 insertions(+) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 49e4719..a9f6f39 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -24,6 +24,7 @@ #include #include /* for rq_end_sector() */ #include +#include #include @@ -3669,11 +3670,132 @@ void dm_free_md_mempools(struct dm_md_mempools *pools) kfree(pools); } +static int dm_pr_register(struct block_device *bdev, u64 old_key, u64 new_key, + bool ignore) +{ + struct mapped_device *md = bdev->bd_disk->private_data; + const struct pr_ops *ops; + struct dm_target *tgt; + fmode_t mode; + int srcu_idx, r; + + r = dm_get_live_table_for_ioctl(md, &tgt, &bdev, &mode, &srcu_idx); + if (r < 0) + return r; + + ops = bdev->bd_disk->fops->pr_ops; + if (ops && ops->pr_register) + r = ops->pr_register(bdev, old_key, new_key, ignore); + else + r = -EOPNOTSUPP; + + dm_put_live_table(md, srcu_idx); + return r; +} + +static int dm_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type) +{ + struct mapped_device *md = bdev->bd_disk->private_data; + const struct pr_ops *ops; + struct dm_target *tgt; + fmode_t mode; + int srcu_idx, r; + + r = dm_get_live_table_for_ioctl(md, &tgt, &bdev, &mode, &srcu_idx); + if (r < 0) + return r; + + ops = bdev->bd_disk->fops->pr_ops; + if (ops && ops->pr_reserve) + r = ops->pr_reserve(bdev, key, type); + else + r = -EOPNOTSUPP; + + dm_put_live_table(md, srcu_idx); + return r; +} + +static int dm_pr_release(struct block_device *bdev, u64 key, enum pr_type type) +{ + struct mapped_device *md = bdev->bd_disk->private_data; + const struct pr_ops *ops; + struct dm_target *tgt; + fmode_t mode; + int srcu_idx, r; + + r = dm_get_live_table_for_ioctl(md, &tgt, &bdev, &mode, &srcu_idx); + if (r < 0) + return r; + + ops = bdev->bd_disk->fops->pr_ops; + if (ops && ops->pr_release) + r = ops->pr_release(bdev, key, type); + else + r = -EOPNOTSUPP; + + dm_put_live_table(md, srcu_idx); + return r; +} + +static int dm_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key, + enum pr_type type, bool abort) +{ + struct mapped_device *md = bdev->bd_disk->private_data; + const struct pr_ops *ops; + struct dm_target *tgt; + fmode_t mode; + int srcu_idx, r; + + r = dm_get_live_table_for_ioctl(md, &tgt, &bdev, &mode, &srcu_idx); + if (r < 0) + return r; + + ops = bdev->bd_disk->fops->pr_ops; + if (ops && ops->pr_preempt) + r = ops->pr_preempt(bdev, old_key, new_key, type, abort); + else + r = -EOPNOTSUPP; + + dm_put_live_table(md, srcu_idx); + return r; +} + +static int dm_pr_clear(struct block_device *bdev, u64 key) +{ + struct mapped_device *md = bdev->bd_disk->private_data; + const struct pr_ops *ops; + struct dm_target *tgt; + fmode_t mode; + int srcu_idx, r; + + r = dm_get_live_table_for_ioctl(md, &tgt, &bdev, &mode, &srcu_idx); + if (r < 0) + return r; + + ops = bdev->bd_disk->fops->pr_ops; + if (ops && ops->pr_clear) + r = ops->pr_clear(bdev, key); + else + r = -EOPNOTSUPP; + + dm_put_live_table(md, srcu_idx); + return r; +} + +static const struct pr_ops dm_pr_ops = { + .pr_register = dm_pr_register, + .pr_reserve = dm_pr_reserve, + .pr_release = dm_pr_release, + .pr_preempt = dm_pr_preempt, + .pr_clear = dm_pr_clear, +}; + static const struct block_device_operations dm_blk_dops = { .open = dm_blk_open, .release = dm_blk_close, .ioctl = dm_blk_ioctl, .getgeo = dm_blk_getgeo, + .pr_ops = &dm_pr_ops, .owner = THIS_MODULE };