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Function do_qc() is supposed to be conceptually simple: it alters the current in-memory and on-disk quota change values for a given uid/gid by a given delta. If the on-disk record isn't defined yet, a new record is created. If the on-disk record exists and the resulting change value is zero, there no longer is a need for that record and so the record is deleted. On top of that, some reference counting is involved when creating and deleting records. Currently, instead of doing the above, do_qc() alters the on-disk value and then it sets the in-memory value to the on-disk value. This is incorrect when the on-disk value differs from the in-memory value. The two values are allowed to differ when quota changes are synced to the global quota file. Fix by changing both values by the same amount. In addition, do_qc() currently gets confused when the delta value is 0. It isn't supposed to be called that way, but that assumption isn't mentioned and it makes the code harder to read. Make the code more explicit. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.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 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.