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ea4f9e75ec
Previously, io path option changes on a file would be picked up automatically and applied to existing data - but not for reflinked data, as we had no way of doing this safely. A user may have had permission to copy (and reflink) a given file, but not write to it, and if so they shouldn't be allowed to change e.g. nr_replicas or other options. This uses the incompat feature mechanism in the previous patch to add a new incompatible flag to bch_reflink_p, indicating whether a given reflink pointer may propagate io path option changes back to the indirect extent. In this initial patch we're only setting it for the source extents. We'd like to set it for the destination in a reflink copy, when the user has write access to the source, but that requires mnt_idmap which is not curretly plumbed up to remap_file_range. 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 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.