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66487c54ad
The is_ancestor bitmap is at optimization for bch2_snapshot_is_ancestor; once we get sufficiently close to the ancestor ID we're searching for we test a bitmap. But initialization of the is_ancestor bitmap was broken; we do it by using bch2_snapshot_parent(), but we call that on nodes that haven't been initialized yet with bch2_mark_snapshot(). Fix this by adding a separate loop in bch2_snapshots_read() for initializing the is_ancestor bitmap, and also add some new debug asserts for checking this sort of breakage in the future. Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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.