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authorLinus Torvalds <torvalds@linux-foundation.org>2019-11-25 12:21:23 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2019-11-25 12:21:23 -0800
commit1c1ff4836fdab94c7c15b23be57bf64c1e56a36f (patch)
treeb9cbc6f035098372b17e05decc9fc28cf882d692 /Documentation
parentea4b71bc0bb646f811e4728389485f1d0522f7ea (diff)
parent73f0ec02d670a61afcef49bc0a74d42e324276ea (diff)
downloadlinux-1c1ff4836fdab94c7c15b23be57bf64c1e56a36f.tar.bz2
Merge tag 'fsverity-for-linus' of git://git.kernel.org/pub/scm/fs/fscrypt/fscrypt
Pull fsverity updates from Eric Biggers: "Expose the fs-verity bit through statx()" * tag 'fsverity-for-linus' of git://git.kernel.org/pub/scm/fs/fscrypt/fscrypt: docs: fs-verity: mention statx() support f2fs: support STATX_ATTR_VERITY ext4: support STATX_ATTR_VERITY statx: define STATX_ATTR_VERITY docs: fs-verity: document first supported kernel version
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/filesystems/fsverity.rst12
1 files changed, 10 insertions, 2 deletions
diff --git a/Documentation/filesystems/fsverity.rst b/Documentation/filesystems/fsverity.rst
index 42a0b6dd9e0b..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
======================
@@ -398,7 +406,7 @@ pages have been read into the pagecache. (See `Verifying data`_.)
ext4
----
-ext4 supports fs-verity since Linux TODO and e2fsprogs v1.45.2.
+ext4 supports fs-verity since Linux v5.4 and e2fsprogs v1.45.2.
To create verity files on an ext4 filesystem, the filesystem must have
been formatted with ``-O verity`` or had ``tune2fs -O verity`` run on
@@ -434,7 +442,7 @@ also only supports extent-based files.
f2fs
----
-f2fs supports fs-verity since Linux TODO and f2fs-tools v1.11.0.
+f2fs supports fs-verity since Linux v5.4 and f2fs-tools v1.11.0.
To create verity files on an f2fs filesystem, the filesystem must have
been formatted with ``-O verity``.