From patchwork Sat Apr 27 21:11:28 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Al Viro X-Patchwork-Id: 13645773 Received: from zeniv.linux.org.uk (zeniv.linux.org.uk [62.89.141.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EBC483A8EF; Sat, 27 Apr 2024 21:11:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=62.89.141.173 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714252292; cv=none; b=frOhVcy6qbW973+NBWgmT7Ka6DGLnKncmxYbJLeb8mIcnMFX24rphkM9O+vVezUCUtYTlEdiojbw5ee9mY3M+FTyCgS6QzgJ5QVrIIRNECFuWMCqXi6ShwxCKG+Et35sqrJ2j2ejxZ/1oMO9N3+LQUpLnoyKD2GS86WTEMJNe1M= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714252292; c=relaxed/simple; bh=Dq5f+ejUETiFzRlLl7Y5xg/5QsFIWYNnilGxhCvIZK0=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=mIw46uT8WwPSZhoH+ptsIX7vcgdwwc3zly1AD0KpoC2ngF3uOF18FD0gU/KGZe2w+Acrw3rdLV+4t2BuGA9GG51nULZ7u/jZdaFRbOUAfcy+9o81W0V9hNAYe0gH8j+6iNiPerimOR1s2UjTRcV8rPU08dJ39zZheNWF0dGNa6w= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zeniv.linux.org.uk; spf=none smtp.mailfrom=ftp.linux.org.uk; dkim=pass (2048-bit key) header.d=linux.org.uk header.i=@linux.org.uk header.b=nVWT2uoE; arc=none smtp.client-ip=62.89.141.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zeniv.linux.org.uk Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=ftp.linux.org.uk Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linux.org.uk header.i=@linux.org.uk header.b="nVWT2uoE" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=linux.org.uk; s=zeniv-20220401; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=vtUeEAm40my/mX+7c/W6sObNsUyFrfkBXLiOVdV8j6c=; b=nVWT2uoExcrdvF43eehWNT4Dds //4aNiCI8Pa5L9TLDC+kVmTqqZ5j8JTSD07b78/XIqveealmG2PTwT3eNRLq7iB7Dex14fnJFKXSc FmPsZ18sKMoqZjEGUAyNKoTwDlaEV/4cIc58pV+rGwpvl3y4eLZZoruIMZAJHErm6bkLKAhhszlMh X3dgTy+BQlB6otIRhsXFt1RdTEOzRaVwkjr2pvgt9JtiQ6kvrRxPKNB7QrO8PXEhS2xPGHTRifZDt F6ZpBL+FJY5+f499oKaa4NkDLpblohAKJC+SnGn3cUxmLS9oklO4nFj+4tYDLH3MVkTABr2IB6+Zk W/GANHHw==; Received: from viro by zeniv.linux.org.uk with local (Exim 4.96 #2 (Red Hat Linux)) id 1s0pKS-006H66-0m; Sat, 27 Apr 2024 21:11:28 +0000 Date: Sat, 27 Apr 2024 22:11:28 +0100 From: Al Viro To: linux-fsdevel@vger.kernel.org Cc: Linus Torvalds , Christian Brauner , Christoph Hellwig , linux-block@vger.kernel.org, Jens Axboe , linux-btrfs@vger.kernel.org, "Rafael J. Wysocki" , Andrew Morton Subject: [PATCH 4/7] swapon(2): open swap with O_EXCL Message-ID: <20240427211128.GD1495312@ZenIV> References: <20240427210920.GR2118490@ZenIV> Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20240427210920.GR2118490@ZenIV> Sender: Al Viro ... eliminating the need to reopen block devices so they could be exclusively held. Signed-off-by: Al Viro Signed-off-by: Al Viro Reviewed-by: Christoph Hellwig Reviewed-by: Christian Brauner --- include/linux/swap.h | 1 - mm/swapfile.c | 19 ++----------------- 2 files changed, 2 insertions(+), 18 deletions(-) diff --git a/include/linux/swap.h b/include/linux/swap.h index a5b640cca459..7e61a4aef2fc 100644 --- a/include/linux/swap.h +++ b/include/linux/swap.h @@ -298,7 +298,6 @@ struct swap_info_struct { unsigned int __percpu *cluster_next_cpu; /*percpu index for next allocation */ struct percpu_cluster __percpu *percpu_cluster; /* per cpu's swap location */ struct rb_root swap_extent_root;/* root of the swap extent rbtree */ - struct file *bdev_file; /* open handle of the bdev */ struct block_device *bdev; /* swap device or bdev of swap file */ struct file *swap_file; /* seldom referenced */ struct completion comp; /* seldom referenced */ diff --git a/mm/swapfile.c b/mm/swapfile.c index 304f74d039f3..71cb76a2d0ce 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -2550,10 +2550,6 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile) exit_swap_address_space(p->type); inode = mapping->host; - if (p->bdev_file) { - fput(p->bdev_file); - p->bdev_file = NULL; - } inode_lock(inode); inode->i_flags &= ~S_SWAPFILE; @@ -2780,14 +2776,7 @@ static struct swap_info_struct *alloc_swap_info(void) static int claim_swapfile(struct swap_info_struct *p, struct inode *inode) { if (S_ISBLK(inode->i_mode)) { - p->bdev_file = bdev_file_open_by_dev(inode->i_rdev, - BLK_OPEN_READ | BLK_OPEN_WRITE, p, NULL); - if (IS_ERR(p->bdev_file)) { - int error = PTR_ERR(p->bdev_file); - p->bdev_file = NULL; - return error; - } - p->bdev = file_bdev(p->bdev_file); + p->bdev = I_BDEV(inode); /* * Zoned block devices contain zones that have a sequential * write only restriction. Hence zoned block devices are not @@ -3028,7 +3017,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) name = NULL; goto bad_swap; } - swap_file = file_open_name(name, O_RDWR|O_LARGEFILE, 0); + swap_file = file_open_name(name, O_RDWR|O_LARGEFILE|O_EXCL, 0); if (IS_ERR(swap_file)) { error = PTR_ERR(swap_file); swap_file = NULL; @@ -3225,10 +3214,6 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) p->percpu_cluster = NULL; free_percpu(p->cluster_next_cpu); p->cluster_next_cpu = NULL; - if (p->bdev_file) { - fput(p->bdev_file); - p->bdev_file = NULL; - } inode = NULL; destroy_swap_extents(p); swap_cgroup_swapoff(p->type);