2940295c97
JOURNAL_RES_GET_RESERVED should only be used for updatse that need to be done to free up space in the journal. In particular, when we're flushing keys from the key cache, if we're flushing them out of order we shouldn't be using it, since we're using up our remaining space in the journal without dropping a pin that will let us make forward progress. With this patch, BTREE_INSERT_JOURNAL_RECLAIM without BTREE_INSERT_JOURNAL_RESERVED may return -EAGAIN - we can't wait on journal reclaim if we're already in journal reclaim. This means we need to propagate these errors up to journal reclaim, indicating that flushing a journal pin should be retried in the future. This is prep work for a patch to change the way journal reclaim works, to split out flushing key cache keys because the btree key cache is too dirty from journal reclaim because we need space in the journal. Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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.