From patchwork Thu Feb 15 17:42:32 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dave Jiang X-Patchwork-Id: 10222827 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 9032B602CB for ; Thu, 15 Feb 2018 17:42:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6282826CFF for ; Thu, 15 Feb 2018 17:42:36 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5758A2859F; Thu, 15 Feb 2018 17:42:36 +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=-1.9 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id C341826CFF for ; Thu, 15 Feb 2018 17:42:35 +0000 (UTC) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id 1BD7522161150; Thu, 15 Feb 2018 09:36:42 -0800 (PST) X-Original-To: linux-nvdimm@lists.01.org Delivered-To: linux-nvdimm@lists.01.org Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=134.134.136.20; helo=mga02.intel.com; envelope-from=dave.jiang@intel.com; receiver=linux-nvdimm@lists.01.org Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 93D6B21CF1CF9 for ; Thu, 15 Feb 2018 09:36:40 -0800 (PST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 15 Feb 2018 09:42:33 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.46,517,1511856000"; d="scan'208";a="18446014" Received: from djiang5-desk3.ch.intel.com ([143.182.136.93]) by orsmga008.jf.intel.com with ESMTP; 15 Feb 2018 09:42:32 -0800 Subject: [PATCH v4 1/3] fs: allow per-device dax status checking for filesystems From: Dave Jiang To: darrick.wong@oracle.com Date: Thu, 15 Feb 2018 10:42:32 -0700 Message-ID: <151871655228.27617.3514495396592472682.stgit@djiang5-desk3.ch.intel.com> In-Reply-To: <151871644696.27617.4390718895806529377.stgit@djiang5-desk3.ch.intel.com> References: <151871644696.27617.4390718895806529377.stgit@djiang5-desk3.ch.intel.com> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-BeenThere: linux-nvdimm@lists.01.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Linux-nvdimm developer list." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-nvdimm@lists.01.org, david@fromorbit.com, linux-xfs@vger.kernel.org, linux-ext4@vger.kernel.org Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" X-Virus-Scanned: ClamAV using ClamSMTP From: Darrick J. Wong Refactor __bdev_dax_supported into a sb_dax_supported helper for single-bdev filesystems and a regular bdev_dax_supported that takes a bdev parameter. This enables multi-device filesystems like xfs to check that a dax device can work for the particular filesystem. Once that's in place, actually fix all the parts of XFS where we need to be able to distinguish between datadev and rtdev. This patch fixes the problem where we screw up the dax support checking in xfs if the datadev and rtdev have different dax capabilities. Signed-off-by: Darrick J. Wong --- drivers/dax/super.c | 9 +++++---- fs/ext2/super.c | 2 +- fs/ext4/super.c | 2 +- fs/xfs/xfs_ioctl.c | 3 ++- fs/xfs/xfs_iops.c | 30 +++++++++++++++++++++++++----- fs/xfs/xfs_super.c | 11 +++++++++-- include/linux/dax.h | 16 ++++++++++++---- 7 files changed, 55 insertions(+), 18 deletions(-) diff --git a/drivers/dax/super.c b/drivers/dax/super.c index 473af694ad1c..8a3a168a267f 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -73,8 +73,9 @@ EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev); #endif /** - * __bdev_dax_supported() - Check if the device supports dax for filesystem + * bdev_dax_supported() - Check if the device supports dax for filesystem * @sb: The superblock of the device + * @bdev: block device to check * @blocksize: The block size of the device * * This is a library function for filesystems to check if the block device @@ -82,9 +83,9 @@ EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev); * * Return: negative errno if unsupported, 0 if supported. */ -int __bdev_dax_supported(struct super_block *sb, int blocksize) +int bdev_dax_supported(struct super_block *sb, struct block_device *bdev, + int blocksize) { - struct block_device *bdev = sb->s_bdev; struct dax_device *dax_dev; pgoff_t pgoff; int err, id; @@ -135,7 +136,7 @@ int __bdev_dax_supported(struct super_block *sb, int blocksize) return 0; } -EXPORT_SYMBOL_GPL(__bdev_dax_supported); +EXPORT_SYMBOL_GPL(bdev_dax_supported); #endif enum dax_device_flags { diff --git a/fs/ext2/super.c b/fs/ext2/super.c index 7666c065b96f..28ca694e9e92 100644 --- a/fs/ext2/super.c +++ b/fs/ext2/super.c @@ -961,7 +961,7 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent) blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); if (sbi->s_mount_opt & EXT2_MOUNT_DAX) { - err = bdev_dax_supported(sb, blocksize); + err = sb_dax_supported(sb, blocksize); if (err) { ext2_msg(sb, KERN_ERR, "DAX unsupported by block device. Turning off DAX."); diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 39bf464c35f1..a09f832aad35 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -3714,7 +3714,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) " that may contain inline data"); sbi->s_mount_opt &= ~EXT4_MOUNT_DAX; } - err = bdev_dax_supported(sb, blocksize); + err = sb_dax_supported(sb, blocksize); if (err) { ext4_msg(sb, KERN_ERR, "DAX unsupported by block device. Turning off DAX."); diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index 89fb1eb80aae..277355f5c084 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -1103,7 +1103,8 @@ xfs_ioctl_setattr_dax_invalidate( if (fa->fsx_xflags & FS_XFLAG_DAX) { if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) return -EINVAL; - if (bdev_dax_supported(sb, sb->s_blocksize) < 0) + if (bdev_dax_supported(sb, xfs_find_bdev_for_inode(VFS_I(ip)), + sb->s_blocksize) < 0) return -EINVAL; } diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c index 56475fcd76f2..66cd61c172af 100644 --- a/fs/xfs/xfs_iops.c +++ b/fs/xfs/xfs_iops.c @@ -1182,6 +1182,30 @@ static const struct inode_operations xfs_inline_symlink_inode_operations = { .update_time = xfs_vn_update_time, }; +/* Figure out if this file actually supports DAX. */ +static bool +xfs_inode_supports_dax( + struct xfs_inode *ip) +{ + struct xfs_mount *mp = ip->i_mount; + + /* Only supported on non-reflinked files. */ + if (!S_ISREG(VFS_I(ip)->i_mode) || xfs_is_reflink_inode(ip)) + return false; + + /* DAX mount option or DAX iflag must be set. */ + if (!(mp->m_flags & XFS_MOUNT_DAX) && + !(ip->i_d.di_flags2 & XFS_DIFLAG2_DAX)) + return false; + + /* Block size must match page size */ + if (mp->m_sb.sb_blocksize != PAGE_SIZE) + return false; + + /* Device has to support DAX too. */ + return xfs_find_daxdev_for_inode(VFS_I(ip)) != NULL; +} + STATIC void xfs_diflags_to_iflags( struct inode *inode, @@ -1200,11 +1224,7 @@ xfs_diflags_to_iflags( inode->i_flags |= S_SYNC; if (flags & XFS_DIFLAG_NOATIME) inode->i_flags |= S_NOATIME; - if (S_ISREG(inode->i_mode) && - ip->i_mount->m_sb.sb_blocksize == PAGE_SIZE && - !xfs_is_reflink_inode(ip) && - (ip->i_mount->m_flags & XFS_MOUNT_DAX || - ip->i_d.di_flags2 & XFS_DIFLAG2_DAX)) + if (xfs_inode_supports_dax(ip)) inode->i_flags |= S_DAX; } diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index 7aba628dc527..f6c74ef9722c 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -1657,11 +1657,18 @@ xfs_fs_fill_super( sb->s_flags |= SB_I_VERSION; if (mp->m_flags & XFS_MOUNT_DAX) { + int error2 = 0; + xfs_warn(mp, "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); - error = bdev_dax_supported(sb, sb->s_blocksize); - if (error) { + error = bdev_dax_supported(sb, mp->m_ddev_targp->bt_bdev, + sb->s_blocksize); + if (mp->m_rtdev_targp) + error2 = bdev_dax_supported(sb, + mp->m_rtdev_targp->bt_bdev, + sb->s_blocksize); + if (error && error2) { xfs_alert(mp, "DAX unsupported by block device. Turning off DAX."); mp->m_flags &= ~XFS_MOUNT_DAX; diff --git a/include/linux/dax.h b/include/linux/dax.h index 0185ecdae135..e640c8a19ec0 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -40,10 +40,11 @@ static inline void put_dax(struct dax_device *dax_dev) int bdev_dax_pgoff(struct block_device *, sector_t, size_t, pgoff_t *pgoff); #if IS_ENABLED(CONFIG_FS_DAX) -int __bdev_dax_supported(struct super_block *sb, int blocksize); -static inline int bdev_dax_supported(struct super_block *sb, int blocksize) +int bdev_dax_supported(struct super_block *sb, struct block_device *bdev, + int blocksize); +static inline int sb_dax_supported(struct super_block *sb, int blocksize) { - return __bdev_dax_supported(sb, blocksize); + return bdev_dax_supported(sb, sb->s_bdev, blocksize); } static inline struct dax_device *fs_dax_get_by_host(const char *host) @@ -58,7 +59,14 @@ static inline void fs_put_dax(struct dax_device *dax_dev) struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev); #else -static inline int bdev_dax_supported(struct super_block *sb, int blocksize) +static inline int bdev_dax_supported(struct super_block *sb, + struct block_device *bdev, + int blocksize) +{ + return -EOPNOTSUPP; +} + +static inline int sb_dax_supported(struct super_block *sb, int blocksize) { return -EOPNOTSUPP; }