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author | Gao Xiang | 2018-12-07 17:19:16 +0100 |
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committer | Greg Kroah-Hartman | 2018-12-07 17:10:48 +0100 |
commit | 92e6efd566c4a15de9b0ad3e7954448b1ad66f42 (patch) | |
tree | 060022a5c381cfd2be613c46aa18eed035cdfc98 /drivers/staging/erofs/unzip_vle.h | |
parent | staging: erofs: revisit the page submission flow (diff) | |
download | kernel-qcow2-linux-92e6efd566c4a15de9b0ad3e7954448b1ad66f42.tar.gz kernel-qcow2-linux-92e6efd566c4a15de9b0ad3e7954448b1ad66f42.tar.xz kernel-qcow2-linux-92e6efd566c4a15de9b0ad3e7954448b1ad66f42.zip |
staging: erofs: refine compressed pages preload flow
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>
Diffstat (limited to 'drivers/staging/erofs/unzip_vle.h')
0 files changed, 0 insertions, 0 deletions