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4a2fe29608
alloc_multiple_bios() has the useful ability to try allocating bios with GFP_NOWAIT but will fallback to using GFP_NOIO. The callers service both empty flush bios and abnormal bios (e.g. discard). alloc_multiple_bios() enhancements offered in this commit: - don't require table_devices_lock if num_bios = 1 - allow caller to pass GFP_NOWAIT to do usual GFP_NOWAIT with GFP_NOIO fallback - allow caller to pass GFP_NOIO to _only_ allocate using GFP_NOIO Flush bios with data may be issued to DM with REQ_NOWAIT, as such it makes sense to attempt servicing them with GFP_NOWAIT allocations. But abnormal IO should never be issued using REQ_NOWAIT (if that changes in the future that's fine, but no sense supporting it now). While at it, rename __send_changing_extent_only() to __send_abnormal_io(). [Thanks to both Ming and Mikulas for help with translating known possible IO scenarios to requirements.] Suggested-by: Ming Lei <ming.lei@redhat.com> Suggested-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@kernel.org> |
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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.