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0224d17d76
If snapshot deletion incorrectly missing some keys and leaves keys for deleted snapshots, that causes a bit of a problem for data move - we can't move an extent for a nonexistent snapshot, because the extent might have to be fragmented, and maintaining correct visibility in child snapshots doesn't work if it doesn't have a snapshot. Previously we'd just skip these keys, but it turns out that causes copygc to spin. So we need runtime self healing, i.e. calling check_key_has_snapshot() from the data move path. Snapshot deletion v2 included sentinal values for deleted snapshot nodes, so this is quite safe. Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev> |
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| README | ||
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.