df60f6e835
On wbt invariant is that if one IO is tracked via WBT_TRACKED, rqw->inflight should be updated for tracking this IO. But commitc1c80384c8("block: remove external dependency on wbt_flags") forgets to remove the early handling of !rwb_enabled(rwb) inside wbt_wait(), then the inflight counter may not be increased in wbt_wait(), but decreased in wbt_done() for this kind of IO, so this counter may become negative, then wbt_wait() may wait forever. This patch fixes the report in the following link: https://marc.info/?l=linux-block&m=153221542021033&w=2 Fixes:c1c80384c8("block: remove external dependency on wbt_flags") Cc: Josef Bacik <jbacik@fb.com> Reported-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> 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.
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.