From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 2A43D280328; Wed, 29 Oct 2025 00:53:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761699183; cv=none; b=ow/bpdbM4C+yAjw3gXhoo3AM1ZkvLEioZa1QhrwwUHSiqMjZlMjons0531kPpKFIc89pWF1KpT9+qNsGscfj5kQFfHX5laU1vr9Fh3qGYkJtImxBakGt27bwwXmlIzUAXOYJnUJLS7M8Q6zAvrB/51AXhkW/Ub8L+wA7Z4BuAJU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761699183; c=relaxed/simple; bh=8N1aWQ0HdDBx26664X4lfj7Yx7kPfiPy8s8LXkpzjJU=; h=Date:Subject:From:To:Cc:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=QpINDUW0W4srOAcOSLhh9rUFAfwdA/nFgCCP9t19kpXJkpWucV+3S4Lb90+X3dQ1+ovgGa/d+rpnPN1TTtMttcyCgCJcg+PhP22ybj43t1aA3S/uel58FkxVeK4muH8Ww23gDWA8Xl+q2c7Y6luQssJA6lwTGF00zTF+7w5SWFA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Mki6rYJJ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Mki6rYJJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AB727C4CEE7; Wed, 29 Oct 2025 00:53:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761699182; bh=8N1aWQ0HdDBx26664X4lfj7Yx7kPfiPy8s8LXkpzjJU=; h=Date:Subject:From:To:Cc:In-Reply-To:References:From; b=Mki6rYJJv0V0/5lNkC+IJWBqYCGMjidA/Iux5COOVmVXd+EyldTTPl7wCy3OriccP ur8ycK6o74skEjNdVHsnXx5FGHfHvRVe3LC+0Z03SKrTKpn3d0zJ0o35zS8nrbP38W s3Xj4aSaRvkg0wJlnN/sBfcHDgPrq3/CqiQ1KvmrNPB1vOVCayXdG5+RtlaGrPs2Rn 1CZE7si0CkLm9uVNYyG98OTabCsX1rL0hN1N6bE0MGQWsN6a/fLCEC8yV2mIeIItGV o7dBBik4LYmo8gcT6IPSdzg2SnMXmUmWgBi4O2boRH9F7ZdLhGD97gnYec1fPG4WXU g5kPrcuwRk4gQ== Date: Tue, 28 Oct 2025 17:53:02 -0700 Subject: [PATCH 31/31] fuse: implement freeze and shutdowns for iomap filesystems From: "Darrick J. Wong" To: djwong@kernel.org, miklos@szeredi.hu Cc: joannelkoong@gmail.com, bernd@bsbernd.com, neal@gompa.dev, linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org Message-ID: <176169811023.1424854.7225516717354931327.stgit@frogsfrogsfrogs> In-Reply-To: <176169810144.1424854.11439355400009006946.stgit@frogsfrogsfrogs> References: <176169810144.1424854.11439355400009006946.stgit@frogsfrogsfrogs> Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Darrick J. Wong Implement filesystem freezing and block device shutdown notifications for iomap-based servers Signed-off-by: "Darrick J. Wong" --- include/uapi/linux/fuse.h | 12 +++++++ fs/fuse/inode.c | 73 +++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 85 insertions(+) diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h index 41e88f1089f1b9..5d10e471f2df7f 100644 --- a/include/uapi/linux/fuse.h +++ b/include/uapi/linux/fuse.h @@ -690,6 +690,10 @@ enum fuse_opcode { FUSE_STATX = 52, FUSE_COPY_FILE_RANGE_64 = 53, + FUSE_FREEZE_FS = 4089, + FUSE_UNFREEZE_FS = 4090, + FUSE_SHUTDOWN_FS = 4091, + FUSE_IOMAP_CONFIG = 4092, FUSE_IOMAP_IOEND = 4093, FUSE_IOMAP_BEGIN = 4094, @@ -1251,6 +1255,14 @@ struct fuse_syncfs_in { uint64_t padding; }; +struct fuse_freezefs_in { + uint64_t unlinked; +}; + +struct fuse_shutdownfs_in { + uint64_t flags; +}; + /* * For each security context, send fuse_secctx with size of security context * fuse_secctx will be followed by security context name and this in turn diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index c3f985baf21c77..d41a6e418537b5 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -1221,6 +1221,74 @@ static struct dentry *fuse_get_parent(struct dentry *child) return parent; } +#ifdef CONFIG_FUSE_IOMAP +/* + * Second stage of a freeze. The data is already frozen so we only + * need to take care of the fuse server. + */ +static int fuse_freeze_fs(struct super_block *sb) +{ + struct fuse_mount *fm = get_fuse_mount_super(sb); + struct fuse_conn *fc = get_fuse_conn_super(sb); + struct fuse_freezefs_in inarg = { + .unlinked = atomic_long_read(&sb->s_remove_count), + }; + FUSE_ARGS(args); + int err; + + if (!fc->iomap) + return -EOPNOTSUPP; + + args.opcode = FUSE_FREEZE_FS; + args.nodeid = get_node_id(sb->s_root->d_inode); + args.in_numargs = 1; + args.in_args[0].size = sizeof(inarg); + args.in_args[0].value = &inarg; + err = fuse_simple_request(fm, &args); + if (err == -ENOSYS) + err = -EOPNOTSUPP; + return err; +} + +static int fuse_unfreeze_fs(struct super_block *sb) +{ + struct fuse_mount *fm = get_fuse_mount_super(sb); + struct fuse_conn *fc = get_fuse_conn_super(sb); + FUSE_ARGS(args); + int err; + + if (!fc->iomap) + return 0; + + args.opcode = FUSE_UNFREEZE_FS; + args.nodeid = get_node_id(sb->s_root->d_inode); + err = fuse_simple_request(fm, &args); + if (err == -ENOSYS) + err = 0; + return err; +} + +static void fuse_shutdown_fs(struct super_block *sb) +{ + struct fuse_mount *fm = get_fuse_mount_super(sb); + struct fuse_conn *fc = get_fuse_conn_super(sb); + struct fuse_shutdownfs_in inarg = { + .flags = 0, + }; + FUSE_ARGS(args); + + if (!fc->iomap) + return; + + args.opcode = FUSE_SHUTDOWN_FS; + args.nodeid = get_node_id(sb->s_root->d_inode); + args.in_numargs = 1; + args.in_args[0].size = sizeof(inarg); + args.in_args[0].value = &inarg; + fuse_simple_request(fm, &args); +} +#endif /* CONFIG_FUSE_IOMAP */ + /* only for fid encoding; no support for file handle */ static const struct export_operations fuse_export_fid_operations = { .encode_fh = fuse_encode_fh, @@ -1243,6 +1311,11 @@ static const struct super_operations fuse_super_operations = { .statfs = fuse_statfs, .sync_fs = fuse_sync_fs, .show_options = fuse_show_options, +#ifdef CONFIG_FUSE_IOMAP + .freeze_fs = fuse_freeze_fs, + .unfreeze_fs = fuse_unfreeze_fs, + .shutdown = fuse_shutdown_fs, +#endif }; static void sanitize_global_limit(unsigned int *limit)