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d625c6ee49
If we defer a request, we can't be reading the opcode again. Ensure that the user_data and opcode fields are stable. For the user_data we already have a place for it, for the opcode we can fill a one byte hold and store that as well. For both of them, assign them when we originally read the SQE in io_get_sqring(). Any code that uses sqe->opcode or sqe->user_data is switched to req->opcode and req->user_data. Signed-off-by: Jens Axboe <axboe@kernel.dk>
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.
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.