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b465ae7b25
Add feature UBLK_F_QUIESCE, which adds control command `UBLK_U_CMD_QUIESCE_DEV` for quiescing device, then device state can become `UBLK_S_DEV_QUIESCED` or `UBLK_S_DEV_FAIL_IO` finally from ublk_ch_release() with ublk server cooperation. This feature can help to support to upgrade ublk server application by shutting down ublk server gracefully, meantime keep ublk block device persistent during the upgrading period. The feature is only available for UBLK_F_USER_RECOVERY. Suggested-by: Yoav Cohen <yoav@nvidia.com> Link: https://lore.kernel.org/linux-block/DM4PR12MB632807AB7CDCE77D1E5AB7D0A9B92@DM4PR12MB6328.namprd12.prod.outlook.com/ Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250522163523.406289-3-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.