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20efc30a3e
We must have some way of letting a storage device driver know what encryption context it should use for en/decrypting a request. However, it's the filesystem/fscrypt that knows about and manages encryption contexts. As such, when the filesystem layer submits a bio to the block layer, and this bio eventually reaches a device driver with support for inline encryption, the device driver will need to have been told the encryption context for that bio. We want to communicate the encryption context from the filesystem layer to the storage device along with the bio, when the bio is submitted to the block layer. To do this, we add a struct bio_crypt_ctx to struct bio, which can represent an encryption context (note that we can't use the bi_private field in struct bio to do this because that field does not function to pass information across layers in the storage stack). We also introduce various functions to manipulate the bio_crypt_ctx and make the bio/request merging logic aware of the bio_crypt_ctx. Bug: 137270441 Test: tested as series; see I26aac0ac7845a9064f28bb1421eb2522828a6dec Change-Id: I16d99bb97f8cd7971cc11281a0d7120c5f87d83c Signed-off-by: Satya Tangirala <satyat@google.com> Link: https://patchwork.kernel.org/patch/11214719/
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.