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nbd driver sends request header and payload with multiple call of sock_sendmsg, and partial sending can't be avoided. However, nbd driver returns BLK_STS_RESOURCE to block core in this situation. This way causes one issue: request->tag may change in the next run of nbd_queue_rq(), but the original old tag has been sent as part of header cookie, this way confuses nbd driver reply handling, since the real request can't be retrieved any more with the obsolete old tag. Fix it by retrying sending directly in per-socket work function, meantime return BLK_STS_OK to block layer core. Cc: vincent.chen@sifive.com Cc: Leon Schuermann <leon@is.currently.online> Cc: Bart Van Assche <bvanassche@acm.org> Reported-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Tested-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Link: https://lore.kernel.org/r/20241029011941.153037-1-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 reStructuredText 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.