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There are mis-match at counting inflight IO after changing the multipath policy. For example, we started fio test with round-robin policy and then we changed the policy to min-inflight. IOs created under the RR policy is finished under the min-inflight policy and inflight counter only decreased. So the counter would be negative value. And also we started fio test with min-inflight policy and changed the policy to the round-robin. IOs created under the min-inflight policy increased the inflight IO counter but the inflight IO counter was not decreased because the policy was the round-robin when IO was finished. So it should count IOs only if the IO is created under the min-inflight policy. It should not care the policy when the IO is finished. This patch adds a field mp_policy in struct rtrs_clt_io_req and stores the multipath policy when an object of rtrs_clt_io_req is created. Then rtrs-clt checks the mp_policy of only struct rtrs_clt_io_req instead of the struct rtrs_clt. Link: https://lore.kernel.org/r/20210806112112.124313-6-haris.iqbal@ionos.com Signed-off-by: Gioh Kim <gi-oh.kim@ionos.com> Signed-off-by: Jack Wang <jinpu.wang@ionos.com> Reviewed-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: Md Haris Iqbal <haris.iqbal@ionos.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.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.
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.