wireguard-linux/fs/erofs/zdata.c, branch jd/unified-crypt-queue

erofs: convert workstn to XArray

2020-03-03T15:27:25Z

XArray has friendly APIs and it will replace the old radix tree in the near future. This convert makes use of __xa_cmpxchg when inserting on a just inserted item by other thread. In detail, instead of totally looking up again as what we did for the old radix tree, it will try to legitimize the current in-tree item in the XArray therefore more effective. In addition, naming is rather a challenge for non-English speaker like me. The basic idea of workstn is to provide a runtime sparse array with items arranged in the physical block number order. Such items (was called workgroup) can be used to record compress clusters or for later new features. However, both workgroup and workstn seem not good names from whatever point of view, so I'd like to rename them as pslot and managed_pslots to stand for physical slots. This patch handles the second as a part of the radix tree convert. Cc: Matthew Wilcox Link: https://lore.kernel.org/r/20200220024642.91529-1-gaoxiang25@huawei.com Reviewed-by: Chao Yu Signed-off-by: Gao Xiang

erofs: clean up z_erofs_submit_queue()

2020-01-21T08:46:23Z

A label and extra variables will be eliminated, which is more cleaner. Link: https://lore.kernel.org/r/20200121064819.139469-1-gaoxiang25@huawei.com Reviewed-by: Chao Yu Signed-off-by: Gao Xiang

erofs: fold in postsubmit_is_all_bypassed()

2020-01-21T08:46:17Z

No need to introduce such separated helper since cache strategy compile configs were changed into runtime options instead in v5.4. No logic changes. Link: https://lore.kernel.org/r/20200121064747.138987-1-gaoxiang25@huawei.com Reviewed-by: Chao Yu Signed-off-by: Gao Xiang

erofs: remove unused tag argument while registering a workgroup

2020-01-07T02:08:45Z

All workgroups are registered with tag value set to 0, to simplify erofs_register_workgroup() interface the tag argument can be removed, if its only value is sent down to the function body. Signed-off-by: Vladimir Zapolskiy Link: https://lore.kernel.org/r/20200102120118.14979-3-vladimir@tuxera.com Reviewed-by: Chao Yu Signed-off-by: Gao Xiang

erofs: remove unused tag argument while finding a workgroup

2020-01-07T02:08:38Z

It is feasible to simplify erofs_find_workgroup() interface by removing an unused function argument. While formally the argument is used in the function itself, its assigned value is ignored on the caller side. Signed-off-by: Vladimir Zapolskiy Link: https://lore.kernel.org/r/20200102120118.14979-2-vladimir@tuxera.com Reviewed-by: Chao Yu Signed-off-by: Gao Xiang

erofs: drop all vle annotations for runtime names

2019-11-24T03:02:41Z

VLE was an old informal name of fixed-sized output compression which came from published ATC'19 paper [1]. Drop those old annotations since erofs can handle all encoded clusters in block-aligned basis, which is wider than fixed-sized output compression after larger clustersize feature is fully implemented. Unaligned encoding won't be considered in EROFS since it's not friendly to inplace I/O and perhaps decompression inplace. a) Fixed-sized output compression with 16KB pcluster: ___________________________________ |xxxxxxxx|xxxxxxxx|xxxxxxxx|xxxxxxxx| |___ 0___|___ 1___|___ 2___|___ 3___| physical blocks b) Block-aligned fixed-sized input compression with 16KB pcluster: ___________________________________ |xxxxxxxx|xxxxxxxx|xxxxxxxx|xxx00000| |___ 0___|___ 1___|___ 2___|___ 3___| physical blocks c) Block-unaligned fixed-sized input compression with 16KB compression unit: ____________________________________________ |..xxxxxx|xxxxxxxx|xxxxxxxx|xxxxxxxx|x.......| |___ 0___|___ 1___|___ 2___|___ 3___|___ 4___| physical blocks Refine better names for those as well. [1] https://www.usenix.org/conference/atc19/presentation/gao Link: https://lore.kernel.org/r/20191108033733.63919-1-gaoxiang25@huawei.com Reviewed-by: Chao Yu Signed-off-by: Gao Xiang

erofs: set iowait for sync decompression

2019-11-24T03:02:41Z

For those tasks waiting I/O for sync decompression, they should be better marked as IO wait state. Link: https://lore.kernel.org/r/20191008125616.183715-5-gaoxiang25@huawei.com Reviewed-by: Chao Yu Signed-off-by: Gao Xiang

erofs: clean up decompress queue stuffs

2019-11-24T03:02:41Z

Previously, both z_erofs_unzip_io and z_erofs_unzip_io_sb record decompress queues for backend to use. The only difference is that z_erofs_unzip_io is used for on-stack sync decompression so that it doesn't have a super block field (since the caller can pass it in its context), but it increases complexity with only a pointer saving. Rename z_erofs_unzip_io to z_erofs_decompressqueue with a fixed super_block member and kill the other entirely, and it can fallback to sync decompression if memory allocation failure. Link: https://lore.kernel.org/r/20191008125616.183715-4-gaoxiang25@huawei.com Reviewed-by: Chao Yu Signed-off-by: Gao Xiang

erofs: get rid of __stagingpage_alloc helper

2019-11-24T02:57:48Z

Now open code is much cleaner due to iterative development. Link: https://lore.kernel.org/r/20191124025217.12345-1-hsiangkao@aol.com Reviewed-by: Chao Yu Signed-off-by: Gao Xiang

erofs: remove dead code since managed cache is now built-in

2019-10-15T16:07:56Z

After commit 4279f3f9889f ("staging: erofs: turn cache strategies into mount options"), cache strategies are changed into mount options rather than old build configs. Let's kill useless code for obsoleted build options. Link: https://lore.kernel.org/r/20191008125616.183715-2-gaoxiang25@huawei.com Reviewed-by: Chao Yu Signed-off-by: Gao Xiang