92e6efd566
Currently, there are two kinds of compressed pages in erofs: 1) file pages for the in-place decompression and 2) managed pages for cached decompression. Both are all stored in grp->compressed_pages[]. For managed pages, they could already exist or could be preloaded in this round, including the following cases in detail: 1) Already valid (loaded in some previous round); 2) PAGE_UNALLOCATED, should be allocated at the time of submission; 3) Just found in the managed cache, and with an extra page ref. Currently, 1) and 3) can be distinguishable by lock_page and checking its PG_private, which is guaranteed by the reclaim path, but it's better to do a double check by using an extra tag. This patch reworks the preload flow by introducing such the tag by using tagged pointer, too many #ifdefs are removed as well. Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.