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Currently all the target instances are removed under global nvm_lock. This was needed to ensure that nvm_dev struct will not be freed by hot unplug event during target removal. However, current implementation has some drawbacks, since the same lock is used when new nvme subsystem is registered, so we can have a situation, that due to long process of target removal on drive A, registration (and listing in OS) of the drive B will take a lot of time, since it will wait for that lock. Now when we have kref which ensures that nvm_dev will not be freed in the meantime, we can easily get rid of this lock for a time when we are removing nvm targets. Signed-off-by: Igor Konopko <igor.j.konopko@intel.com> Reviewed-by: Javier González <javier@javigon.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> 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.
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.