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 30A0521D2B5; Fri, 4 Oct 2024 18:23:25 +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=1728066206; cv=none; b=Rn6Z7iXZU+jvPkhi8NmoyOn22K/h5Ga6fK6wt48XF+eKfV7w0D+CniGsSv1Un5qRVE/c4gscsMe3JayULgc0xsBV/2Qro4mwbuuenLctfb/KaCpm0w68XO/hFHd2ZqCiEezG/sQLSRZL18rPrNP/97x9mTpLKiZxdJGkWcpxS3s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728066206; c=relaxed/simple; bh=OgZcPiJjXp28Hdtxv0Yvuh/VMCkLoVUraVFp1OhTY6I=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=AP2uGympdl8dkDldcQfcbEkk9Fm6K616i5ZF+0xki+5cKtSwrM0doZTXesGhAXD8jIiNpE3rSHkSC9pz3qoN6ofAyXHf7Wz6a+XBQ4pK0sUf25owMUcDkYN5VQ1fH0rMV3P5RGKUudhlfZxj2iTDvbSedm9wUpTXbU2Ximu8Puk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jIDOJ9EX; 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="jIDOJ9EX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0613DC4CECE; Fri, 4 Oct 2024 18:23:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1728066205; bh=OgZcPiJjXp28Hdtxv0Yvuh/VMCkLoVUraVFp1OhTY6I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jIDOJ9EXQS2BA4eyA1iPY7TjWWynVWX0Ts87+JHABc048H0kFqVdzYuF09XJzMbqj PVDuVErGak78gcJJsG2El8shhMjLppMSRI2HfavZTFsBq8/6GdqfcXFa13mtVCMD1O ndpY4UQG20oGg9hcBSF3yD9vU4xDmk31uf4xQHyEYcRBu5cLderOBX7KY09Uk/cUNo TBLTvo8lGKLS/qxxrABKbSQ9JW0fRDubIP50WWCEzYVZSzFZug2w5owP52OxlUPkv8 gmXpR68/QWfmLWmpvvVyeVAsGkLRHlYh5MyaTE98ZyQ4fHz03isGQT0mwlIj79exZN adRF42D+XGNPg== 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 6.10 44/70] fuse: allow O_PATH fd for FUSE_DEV_IOC_BACKING_OPEN Date: Fri, 4 Oct 2024 14:20:42 -0400 Message-ID: <20241004182200.3670903-44-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241004182200.3670903-1-sashal@kernel.org> References: <20241004182200.3670903-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.10.13 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