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From: Eric Biggers <ebiggers@kernel.org>
To: linux-fscrypt@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org,
	linux-f2fs-devel@lists.sourceforge.net,
	linux-api@vger.kernel.org, David Howells <dhowells@redhat.com>,
	Theodore Ts'o <tytso@mit.edu>, Jaegeuk Kim <jaegeuk@kernel.org>,
	Victor Hsieh <victorhsieh@google.com>
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> (raw)
In-Reply-To: <20191029204141.145309-1-ebiggers@kernel.org>

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(+)

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


  parent reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-29 20:41 [PATCH 0/4] statx: expose the fs-verity bit Eric Biggers
2019-10-29 20:41 ` [PATCH 1/4] statx: define STATX_ATTR_VERITY Eric Biggers
2019-10-30 18:26   ` Andreas Dilger
2019-11-07  1:44   ` Darrick J. Wong
2019-11-07  2:05     ` Andreas Dilger
2019-11-07 22:02     ` [man-pages RFC PATCH] statx.2: document STATX_ATTR_VERITY Eric Biggers
2019-11-08  0:47       ` Darrick J. Wong
2019-11-08  8:23       ` walter harms
2019-11-08 19:35         ` Eric Biggers
2019-11-09 19:34           ` walter harms
2019-11-13 20:31             ` Eric Biggers
2019-11-07 22:12     ` [PATCH 1/4] statx: define STATX_ATTR_VERITY Eric Biggers
2019-10-29 20:41 ` [PATCH 2/4] ext4: support STATX_ATTR_VERITY Eric Biggers
2019-10-30 18:27   ` Andreas Dilger
2019-10-29 20:41 ` [PATCH 3/4] f2fs: " Eric Biggers
2019-10-29 20:41 ` Eric Biggers [this message]
2019-11-06 21:57 ` [PATCH 0/4] statx: expose the fs-verity bit Eric Biggers
2019-11-13 20:20 ` Eric Biggers

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