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 910021E048D; Fri, 4 Oct 2024 18:19:58 +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=1728065998; cv=none; b=kqYlDlSdcuSMuL66vINCmJEHhfxBIrYkjuJaxU+PYWo7xeJue6h0sB/KRrlAHWS3APc7URjvFVYHZGorDRhy5NUJ9o6cgY/aYYmhRJMpmhDZ3yiDNzpSVxjss3zXP7CwJzL89xkHtvcpMNYNoGEEGw+XF+F4IYhs3Q1HzHzrsCU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728065998; c=relaxed/simple; bh=OgZcPiJjXp28Hdtxv0Yvuh/VMCkLoVUraVFp1OhTY6I=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=l9Mj6nzVnaYNkTgOg5UELTZiTmmcfvjlU8OObKjnN7awU5geuzclOIVvkw+9K/A7/3xxH8yeOmhutaj2qdCsCVNqp7EUI4JxwfzyWO+Na78JCANUhgVRFtGCvzJGFhBCnKwnOTN/0coNhluLby8bIym3wEiVIMNf4Le2oI3yN6E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=sD7zopPL; 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="sD7zopPL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A6671C4CECE; Fri, 4 Oct 2024 18:19:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1728065998; bh=OgZcPiJjXp28Hdtxv0Yvuh/VMCkLoVUraVFp1OhTY6I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sD7zopPLsnGQBoXP//HZQRp7on4ajVv1lHujojE5axYAf1gkHCH0aMbHgU1pna7fD RQ4WEPk5h1XllqPbryBPrX/3E4AJh4P31WeRpjWfy+xHlx3zarX3nFftHFf3l+YK/8 WFW6D5erNpJreu6GcFWN0B6ODc3B9oKdSjz57AnTOMwVl9q38W4webHlWkBilGDRto RHxDLeFAPCJAzvqZyHsWaZUfpuJvIyfBl33PaBKp1i6ENcwgc+auS09+gzRrG15Twj Sfg9EXtV+B+gDw55N8Pw9/rc5oG348uRarkbnKqVUf07BKZV0LxiV42sK/tCJiuOsM ggetr+SjXZstw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Miklos Szeredi , Amir Goldstein , Sasha Levin , miklos@szeredi.hu, linux-fsdevel@vger.kernel.org Subject: [PATCH AUTOSEL 6.11 48/76] fuse: allow O_PATH fd for FUSE_DEV_IOC_BACKING_OPEN Date: Fri, 4 Oct 2024 14:17:05 -0400 Message-ID: <20241004181828.3669209-48-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241004181828.3669209-1-sashal@kernel.org> References: <20241004181828.3669209-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.11.2 Content-Transfer-Encoding: 8bit From: Miklos Szeredi [ Upstream commit efad7153bf93db8565128f7567aab1d23e221098 ] Only f_path is used from backing files registered with FUSE_DEV_IOC_BACKING_OPEN, so it makes sense to allow O_PATH descriptors. O_PATH files have an empty f_op, so don't check read_iter/write_iter. Reviewed-by: Amir Goldstein Signed-off-by: Miklos Szeredi Signed-off-by: Sasha Levin --- fs/fuse/passthrough.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/fs/fuse/passthrough.c b/fs/fuse/passthrough.c index 9666d13884ce5..62aee8289d110 100644 --- a/fs/fuse/passthrough.c +++ b/fs/fuse/passthrough.c @@ -228,16 +228,13 @@ int fuse_backing_open(struct fuse_conn *fc, struct fuse_backing_map *map) if (map->flags || map->padding) goto out; - file = fget(map->fd); + file = fget_raw(map->fd); res = -EBADF; if (!file) goto out; - res = -EOPNOTSUPP; - if (!file->f_op->read_iter || !file->f_op->write_iter) - goto out_fput; - backing_sb = file_inode(file)->i_sb; + pr_info("%s: %x:%pD %i\n", __func__, backing_sb->s_dev, file, backing_sb->s_stack_depth); res = -ELOOP; if (backing_sb->s_stack_depth >= fc->max_stack_depth) goto out_fput; -- 2.43.0