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9e9be9840f
This function tries to find a suitable free space extent starting from a particular rtbitmap block. Some time ago, I added a clamping function to prevent the free space scans from running off the end of the bitmap, but I didn't quite get the logic right. Let's say there's an allocation request with a minlen of 5 and a maxlen of 32 and we're scanning the last rtbitmap block. If we come within 4 rtx of the end of the rt volume, maxlen will get clamped to 4. If the next 3 rtx are free, we could have satisfied the allocation, but the code setting partial besti/bestlen for "minlen < maxlen" will think that we're doing a non-variable allocation and ignore it. The root of this problem is overwriting maxlen; I should have stuffed the results in a different variable, which would not have introduced this bug. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de>
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.