From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Biggers Subject: [PATCH 4/4] docs: fs-verity: mention statx() support Date: Tue, 29 Oct 2019 13:41:41 -0700 Message-ID: <20191029204141.145309-5-ebiggers@kernel.org> References: <20191029204141.145309-1-ebiggers@kernel.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20191029204141.145309-1-ebiggers@kernel.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net To: linux-fscrypt@vger.kernel.org Cc: Theodore Ts'o , linux-api@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, David Howells , linux-fsdevel@vger.kernel.org, Jaegeuk Kim , linux-ext4@vger.kernel.org, Victor Hsieh List-Id: linux-api@vger.kernel.org From: Eric Biggers Document that the statx() system call can now be used to check whether a file is a verity file. Signed-off-by: Eric Biggers --- Documentation/filesystems/fsverity.rst | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/Documentation/filesystems/fsverity.rst b/Documentation/filesystems/fsverity.rst index 42a0b6dd9e0b68..3355377a24398d 100644 --- a/Documentation/filesystems/fsverity.rst +++ b/Documentation/filesystems/fsverity.rst @@ -226,6 +226,14 @@ To do so, check for FS_VERITY_FL (0x00100000) in the returned flags. The verity flag is not settable via FS_IOC_SETFLAGS. You must use FS_IOC_ENABLE_VERITY instead, since parameters must be provided. +statx +----- + +Since Linux v5.5, the statx() system call sets STATX_ATTR_VERITY if +the file has fs-verity enabled. This can perform better than +FS_IOC_GETFLAGS and FS_IOC_MEASURE_VERITY because it doesn't require +opening the file, and opening verity files can be expensive. + Accessing verity files ====================== -- 2.24.0.rc1.363.gb1bccd3e3d-goog