Mike Christie
0f11328f2f
This has read_capacity_10() have the SCSI midlayer retry errors instead of
driving them itself.
There are 2 behavior changes with this patch:
1. There is one behavior change where we no longer retry when
scsi_execute_cmd() returns < 0, but we should be ok. We don't need to
retry for failures like the queue being removed, and for the case where
there are no tags/reqs since the block layer waits/retries for us. For
possible memory allocation failures from blk_rq_map_kern() we use
GFP_NOIO, so retrying will probably not help.
2. For the specific UAs we checked for and retried, we would get
READ_CAPACITY_RETRIES_ON_RESET retries plus whatever retries were left
from the main loop's retries. Each UA now gets
READ_CAPACITY_RETRIES_ON_RESET retries, and the other errors get up to
3 retries. This is most likely ok, because
READ_CAPACITY_RETRIES_ON_RESET is already 10 and is not based on
anything specific like a spec or device, so the extra 3 we got from the
main loop was probably just an accident and is not going to help.
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Link: https://lore.kernel.org/r/20240123002220.129141-16-michael.christie@oracle.com
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.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.