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docs: fs-verity: mention statx() support

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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>
This commit is contained in:
Eric Biggers 2019-10-29 13:41:41 -07:00
parent 924e319416
commit 73f0ec02d6
1 changed files with 8 additions and 0 deletions
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8
Documentation/filesystems/fsverity.rst
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@ -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
======================