{"id":807872,"url":"http://patchwork.ozlabs.org/api/1.0/patches/807872/?format=json","project":{"id":8,"url":"http://patchwork.ozlabs.org/api/1.0/projects/8/?format=json","name":"Linux ext4 filesystem development","link_name":"linux-ext4","list_id":"linux-ext4.vger.kernel.org","list_email":"linux-ext4@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null},"msgid":"<150412223265.10177.11004612169458058274.stgit@dwillia2-desk3.amr.corp.intel.com>","date":"2017-08-30T19:43:52","name":"[v3,1/4] dax: introduce a fs_dax_get_by_bdev() helper","commit_ref":null,"pull_url":null,"state":"not-applicable","archived":false,"hash":"732faeb7d57cc432350cdded3bdb8a1a5f8d28cd","submitter":{"id":347,"url":"http://patchwork.ozlabs.org/api/1.0/people/347/?format=json","name":"Dan Williams","email":"dan.j.williams@intel.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-ext4/patch/150412223265.10177.11004612169458058274.stgit@dwillia2-desk3.amr.corp.intel.com/mbox/","series":[{"id":694,"url":"http://patchwork.ozlabs.org/api/1.0/series/694/?format=json","date":"2017-08-30T19:43:47","name":"fs, dax: lookup dax_device at mount time","version":3,"mbox":"http://patchwork.ozlabs.org/series/694/mbox/"}],"check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/807872/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":"patchwork-incoming@ozlabs.org","Delivered-To":"patchwork-incoming@ozlabs.org","Authentication-Results":"ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=vger.kernel.org\n\t(client-ip=209.132.180.67; helo=vger.kernel.org;\n\tenvelope-from=linux-ext4-owner@vger.kernel.org;\n\treceiver=)","Received":["from vger.kernel.org (vger.kernel.org [209.132.180.67])\n\tby ozlabs.org (Postfix) with ESMTP id 3xjGLz4zXdz9sP5\n\tfor ;\n\tThu, 31 Aug 2017 05:50:19 +1000 (AEST)","(majordomo@vger.kernel.org) by vger.kernel.org via listexpand\n\tid S1750941AbdH3TuR (ORCPT );\n\tWed, 30 Aug 2017 15:50:17 -0400","from mga14.intel.com ([192.55.52.115]:52986 \"EHLO mga14.intel.com\"\n\trhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP\n\tid S1750758AbdH3TuR (ORCPT );\n\tWed, 30 Aug 2017 15:50:17 -0400","from fmsmga001.fm.intel.com ([10.253.24.23])\n\tby fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384;\n\t30 Aug 2017 12:50:16 -0700","from dwillia2-desk3.jf.intel.com (HELO\n\tdwillia2-desk3.amr.corp.intel.com) ([10.54.39.125])\n\tby fmsmga001.fm.intel.com with ESMTP; 30 Aug 2017 12:50:16 -0700"],"X-ExtLoop1":"1","X-IronPort-AV":"E=Sophos;i=\"5.41,449,1498546800\"; d=\"scan'208\";a=\"1189933338\"","Subject":"[PATCH v3 1/4] dax: introduce a fs_dax_get_by_bdev() helper","From":"Dan Williams ","To":"linux-xfs@vger.kernel.org, linux-ext4@vger.kernel.org","Cc":"Jan Kara , Christoph Hellwig ,\n\tlinux-nvdimm@lists.01.org","Date":"Wed, 30 Aug 2017 12:43:52 -0700","Message-ID":"<150412223265.10177.11004612169458058274.stgit@dwillia2-desk3.amr.corp.intel.com>","In-Reply-To":"<150412222686.10177.8031279869867070772.stgit@dwillia2-desk3.amr.corp.intel.com>","References":"<150412222686.10177.8031279869867070772.stgit@dwillia2-desk3.amr.corp.intel.com>","User-Agent":"StGit/0.17.1-9-g687f","MIME-Version":"1.0","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"7bit","Sender":"linux-ext4-owner@vger.kernel.org","Precedence":"bulk","List-ID":"","X-Mailing-List":"linux-ext4@vger.kernel.org"},"content":"Add a helper that can replace the following common pattern:\n\n\tif (blk_queue_dax(bdev->bd_queue))\n\t\tfs_dax_get_by_host(bdev->bd_disk->disk_name);\n\nThis will be used to move dax_device lookup from iomap-operation time to\nfs-mount time.\n\nCc: Jan Kara \nCc: Christoph Hellwig \nSigned-off-by: Dan Williams \n---\n drivers/dax/super.c | 10 ++++++++++\n include/linux/dax.h | 6 ++++++\n 2 files changed, 16 insertions(+)","diff":"diff --git a/drivers/dax/super.c b/drivers/dax/super.c\nindex 938eb4868f7f..b699aac268a6 100644\n--- a/drivers/dax/super.c\n+++ b/drivers/dax/super.c\n@@ -46,6 +46,8 @@ void dax_read_unlock(int id)\n EXPORT_SYMBOL_GPL(dax_read_unlock);\n \n #ifdef CONFIG_BLOCK\n+#include \n+\n int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size,\n \t\tpgoff_t *pgoff)\n {\n@@ -59,6 +61,14 @@ int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size,\n }\n EXPORT_SYMBOL(bdev_dax_pgoff);\n \n+struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev)\n+{\n+\tif (!blk_queue_dax(bdev->bd_queue))\n+\t\treturn NULL;\n+\treturn fs_dax_get_by_host(bdev->bd_disk->disk_name);\n+}\n+EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev);\n+\n /**\n * __bdev_dax_supported() - Check if the device supports dax for filesystem\n * @sb: The superblock of the device\ndiff --git a/include/linux/dax.h b/include/linux/dax.h\nindex df97b7af7e2c..ac8afa18f707 100644\n--- a/include/linux/dax.h\n+++ b/include/linux/dax.h\n@@ -57,6 +57,7 @@ static inline void fs_put_dax(struct dax_device *dax_dev)\n \tput_dax(dax_dev);\n }\n \n+struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev);\n #else\n static inline int bdev_dax_supported(struct super_block *sb, int blocksize)\n {\n@@ -71,6 +72,11 @@ static inline struct dax_device *fs_dax_get_by_host(const char *host)\n static inline void fs_put_dax(struct dax_device *dax_dev)\n {\n }\n+\n+static inline struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev)\n+{\n+\treturn NULL;\n+}\n #endif\n \n int dax_read_lock(void);\n","prefixes":["v3","1/4"]}