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24d5493f20
bio_check_pages_dirty currently inviolates the invariant that bv_page of a bio_vec inside bi_vcnt shouldn't be zero, and that is going to become really annoying with multpath biovecs. Fortunately there isn't any all that good reason for it - once we decide to defer freeing the bio to a workqueue holding onto a few additional pages isn't really an issue anymore. So just check if there is a clean page that needs dirtying in the first path, and do a second pass to free them if there was none, while the cache is still hot. Also use the chance to micro-optimize bio_dirty_fn a bit by not saving irq state - we know we are called from a workqueue. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.