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ext4 and f2fs have traditionally not supported direct I/O on encrypted files, since it's difficult to implement with the traditional filesystem-layer encryption. But when inline encryption is used instead, it's straightforward to support direct I/O, as long as the I/O is fully filesystem-block-aligned. Add support for it by: - Making the two generic direct I/O implementations in the kernel, __blockdev_direct_IO() and iomap_dio_rw(), set the encryption context on bios for inline-encrypted files. __blockdev_direct_IO() is used by f2fs, and was used by ext4 in kernel v5.4 and earlier. iomap_dio_rw() is used by ext4 in kernel v5.5 and later. - Making ext4 and f2fs allow direct I/O to encrypted files (rather the current behavior of falling back to buffered I/O) when the file is using inline encryption and the I/O is fully filesystem-block-aligned. Bug: 137270441 Change-Id: I4c8f7497eb8f829d03611d24281113d68c21d4d1 Signed-off-by: Eric Biggers <ebiggers@google.com>
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.