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89a59c1ca7
This is the core of deep-flatten feature: sending a copyup request (i.e. a guarded write of the data read from the parent) with an empty snapshot context (snaps = [], seq = 0) causes the OSD to reflect the write in all existing snapshots. This allows "rbd flatten" to fully disconnect the clone image and its snapshots from the parent and make the parent snapshot removable. The actual modification request is sent only after deep-copyup request is completed. Waiting for deep-copyup reply is unnecessary, this will be improved in the future. Signed-off-by: Ilya Dryomov <idryomov@gmail.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.