[PATCH 4/4] docs: fs-verity: mention statx() support
From: Eric Biggers <ebiggers@kernel.org>
Date: 2019-10-29 20:43:58
Also in:
linux-ext4, linux-f2fs-devel, linux-fscrypt, linux-fsdevel
Subsystem:
documentation, fsverity: read-only file-based authenticity protection, the rest · Maintainers:
Jonathan Corbet, Eric Biggers, Theodore Y. Ts'o, Linus Torvalds
From: Eric Biggers <redacted> Document that the statx() system call can now be used to check whether a file is a verity file. Signed-off-by: Eric Biggers <redacted> --- 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