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When an inode is on an unlinked list during normal operation, it is guaranteed to be pinned in memory as it is either referenced by the current unlink operation or it has a open file descriptor that references it and has it pinned in memory. Hence to look up an inode on the unlinked list, we can do a direct inode cache lookup and always expect the lookup to succeed. Add a function to do this lookup based on the agino that we use to link the chain of unlinked inodes together so we can begin the conversion the unlinked list manipulations to use in-memory inodes rather than inode cluster buffers and remove the backref cache. Use this lookup function to replace the on-disk inode buffer walk when removing inodes from the unlinked list with an in-core inode unlinked list walk. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <djwong@kernel.org>
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.