From patchwork Fri Jul 22 07:12:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 12926026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B682CCCA48F for ; Fri, 22 Jul 2022 07:14:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233946AbiGVHOI (ORCPT ); Fri, 22 Jul 2022 03:14:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37272 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234258AbiGVHOG (ORCPT ); Fri, 22 Jul 2022 03:14:06 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7160D93C39; Fri, 22 Jul 2022 00:14:04 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 9FEE062198; Fri, 22 Jul 2022 07:14:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C2D34C385A5; Fri, 22 Jul 2022 07:14:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1658474043; bh=rxppfGAWTvoazShXWqiRQAPwYvWCuKApheXmuFc/BQY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=d8Cr8JecsbZeIRQ5t/ggsqjOh0c2t2g7QqlNyJmjUUDIPAUtozy6cOgFB7SV0zcUp /T8YLw5znD4KGJcOsBBB+flZcvly70mwKQ41iSnh0z92m9Jmud61wnc1bDwKWuQUJI Rn5yqXLjsVmKwG22H580yBSImGur4cgc3K419yEFlPziedpRBGdmkr5eyqREj/S52z HgTwDj6ixSn33wQw+fOeGINjGF+jSadcLM31+806a4u9E9MpsBAFiqA1lE3se9pjyi gBJMlDD6R3sahaq1iDLwrQyRu2+9b4G5peXYUU8azaH0T6Bj3JrUFlo8CPrg6ZitMi utD1hbXc1INFg== From: Eric Biggers To: linux-fsdevel@vger.kernel.org Cc: linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-xfs@vger.kernel.org, linux-api@vger.kernel.org, linux-fscrypt@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Keith Busch Subject: [PATCH v4 2/9] vfs: support STATX_DIOALIGN on block devices Date: Fri, 22 Jul 2022 00:12:21 -0700 Message-Id: <20220722071228.146690-3-ebiggers@kernel.org> X-Mailer: git-send-email 2.37.0 In-Reply-To: <20220722071228.146690-1-ebiggers@kernel.org> References: <20220722071228.146690-1-ebiggers@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fscrypt@vger.kernel.org From: Eric Biggers Add support for STATX_DIOALIGN to block devices, so that direct I/O alignment restrictions are exposed to userspace in a generic way. Note that this breaks the tradition of stat operating only on the block device node, not the block device itself. However, it was felt that doing this is preferable, in order to make the interface useful and avoid needing separate interfaces for regular files and block devices. Signed-off-by: Eric Biggers Reviewed-by: Christoph Hellwig Reviewed-by: Martin K. Petersen --- block/bdev.c | 25 +++++++++++++++++++++++++ fs/stat.c | 12 ++++++++++++ include/linux/blkdev.h | 4 ++++ 3 files changed, 41 insertions(+) diff --git a/block/bdev.c b/block/bdev.c index 5fe06c1f2def41..cee0951e27a82a 100644 --- a/block/bdev.c +++ b/block/bdev.c @@ -26,6 +26,7 @@ #include #include #include +#include #include "../fs/internal.h" #include "blk.h" @@ -1071,3 +1072,27 @@ void sync_bdevs(bool wait) spin_unlock(&blockdev_superblock->s_inode_list_lock); iput(old_inode); } + +/* + * Handle STATX_DIOALIGN for block devices. + * + * Note that the inode passed to this is the inode of a block device node file, + * not the block device's internal inode. Therefore it is *not* valid to use + * I_BDEV() here; the block device has to be looked up by i_rdev instead. + */ +void bdev_statx_dioalign(struct inode *inode, struct kstat *stat) +{ + struct block_device *bdev; + unsigned int lbs; + + bdev = blkdev_get_no_open(inode->i_rdev); + if (!bdev) + return; + + lbs = bdev_logical_block_size(bdev); + stat->dio_mem_align = lbs; + stat->dio_offset_align = lbs; + stat->result_mask |= STATX_DIOALIGN; + + blkdev_put_no_open(bdev); +} diff --git a/fs/stat.c b/fs/stat.c index a7930d74448304..ef50573c72a269 100644 --- a/fs/stat.c +++ b/fs/stat.c @@ -5,6 +5,7 @@ * Copyright (C) 1991, 1992 Linus Torvalds */ +#include #include #include #include @@ -230,11 +231,22 @@ static int vfs_statx(int dfd, struct filename *filename, int flags, goto out; error = vfs_getattr(&path, stat, request_mask, flags); + stat->mnt_id = real_mount(path.mnt)->mnt_id; stat->result_mask |= STATX_MNT_ID; + if (path.mnt->mnt_root == path.dentry) stat->attributes |= STATX_ATTR_MOUNT_ROOT; stat->attributes_mask |= STATX_ATTR_MOUNT_ROOT; + + /* Handle STATX_DIOALIGN for block devices. */ + if (request_mask & STATX_DIOALIGN) { + struct inode *inode = d_backing_inode(path.dentry); + + if (S_ISBLK(inode->i_mode)) + bdev_statx_dioalign(inode, stat); + } + path_put(&path); if (retry_estale(error, lookup_flags)) { lookup_flags |= LOOKUP_REVAL; diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 2f7b43444c5f8d..d75151bd43b541 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1538,6 +1538,7 @@ int sync_blockdev(struct block_device *bdev); int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend); int sync_blockdev_nowait(struct block_device *bdev); void sync_bdevs(bool wait); +void bdev_statx_dioalign(struct inode *inode, struct kstat *stat); void printk_all_partitions(void); #else static inline void invalidate_bdev(struct block_device *bdev) @@ -1554,6 +1555,9 @@ static inline int sync_blockdev_nowait(struct block_device *bdev) static inline void sync_bdevs(bool wait) { } +static inline void bdev_statx_dioalign(struct inode *inode, struct kstat *stat) +{ +} static inline void printk_all_partitions(void) { }