From 73f0ec02d670a61afcef49bc0a74d42e324276ea Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Tue, 29 Oct 2019 13:41:41 -0700 Subject: docs: fs-verity: mention statx() support 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(+) (limited to 'Documentation/filesystems') diff --git a/Documentation/filesystems/fsverity.rst b/Documentation/filesystems/fsverity.rst index dd55204c9ef8..a95536b6443c 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 ====================== -- cgit