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Merge tag 'fsverity-for-linus' of git://git.kernel.org/pub/scm/fs/fscrypt/fscrypt

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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
This commit is contained in:
Linus Torvalds
2019-11-25 12:21:23 -08:00
parent ea4b71bc0b 73f0ec02d6
commit 1c1ff4836f
5 changed files with 21 additions and 6 deletions
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12
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
======================
@@ -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``.