On Thu, Jun 06, 2019 at 08:51:56AM -0700, Eric Biggers wrote:
> From: Eric Biggers <[email protected]>
> 
> Add the fsverity_file_open() function, which prepares an fs-verity file
> to be read from.  If not already done, it loads the fs-verity descriptor
> from the filesystem and sets up an fsverity_info structure for the inode
> which describes the Merkle tree and contains the file measurement.  It
> also denies all attempts to open verity files for writing.
> 
> This commit also begins the include/linux/fsverity.h header, which
> declares the interface between fs/verity/ and filesystems.
> 
> Signed-off-by: Eric Biggers <[email protected]>

Looks good; you can add:

Reviewed-off-by: Theodore Ts'o <[email protected]>

                                                - Ted

> +/*
> + * Validate the given fsverity_descriptor and create a new fsverity_info from
> + * it.  The signature (if present) is also checked.
> + */
> +struct fsverity_info *fsverity_create_info(const struct inode *inode,
> +                                        const void *_desc, size_t desc_size)

Well, technically it's not checked (yet).  It doesn't get checked
until [PATCH 13/16]: support builtin file signatures.  If we want to
be really nit-picky, that portion of the comment could be moved to
later in the series.



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