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9dd5d3ab49
We can submit IO in a processes context, which means there can be pending signals. This isn't a fatal error for NBD, but it does require some finesse. If the signal happens before we transmit anything then we are ok, just requeue the request and carry on. However if we've done a partial transmit we can't allow anything else to be transmitted on this socket until we transmit the remaining part of the request. Deal with this by keeping track of how much we've sent for the current request, and if we get an ERESTARTSYS during any part of our transmission save the state of that request and requeue the IO. If anybody tries to submit a request that isn't our pending request then requeue that request until we are able to service the one that is pending. Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Jens Axboe <axboe@fb.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.