[4/4] docs: fs-verity: mention statx() support
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Message ID 20191029204141.145309-5-ebiggers@kernel.org
State New
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Series
  • statx: expose the fs-verity bit
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Commit Message

Eric Biggers Oct. 29, 2019, 8:41 p.m. UTC
From: Eric Biggers <ebiggers@google.com>

Document that the statx() system call can now be used to check whether a
file is a verity file.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 Documentation/filesystems/fsverity.rst | 8 ++++++++
 1 file changed, 8 insertions(+)

Patch
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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
 ======================