kernel/git/stable/linux.git/fs/erofs/zdata.h, branch master

erofs: move zdata.h into zdata.c

2023-02-15T00:11:25+00:00

Definitions in zdata.h are only used in zdata.c and for internal use only. No logic changes. Reviewed-by: Yue Hu Reviewed-by: Chao Yu Signed-off-by: Gao Xiang Link: https://lore.kernel.org/r/20230204093040.97967-4-hsiangkao@linux.alibaba.com

erofs: remove tagged pointer helpers

2023-02-15T00:11:25+00:00

Just open-code the remaining one to simplify the code. Reviewed-by: Yue Hu Reviewed-by: Chao Yu Signed-off-by: Gao Xiang Link: https://lore.kernel.org/r/20230204093040.97967-3-hsiangkao@linux.alibaba.com

erofs: avoid tagged pointers to mark sync decompression

2023-02-15T00:11:24+00:00

We could just use a boolean in z_erofs_decompressqueue for sync decompression to simplify the code. Reviewed-by: Yue Hu Reviewed-by: Chao Yu Signed-off-by: Gao Xiang Link: https://lore.kernel.org/r/20230204093040.97967-2-hsiangkao@linux.alibaba.com

erofs: shouldn't churn the mapping page for duplicated copies

2022-10-16T22:55:49+00:00

If other duplicated copies exist in one decompression shot, should leave the old page as is rather than replace it with the new duplicated one. Otherwise, the following cold path to deal with duplicated copies will use the invalid bvec. It impacts compressed data deduplication. Also, shift the onlinepage EIO bit to avoid touching the signed bit. Fixes: 267f2492c8f7 ("erofs: introduce multi-reference pclusters (fully-referenced)") Reviewed-by: Chao Yu Signed-off-by: Gao Xiang Link: https://lore.kernel.org/r/20221012045056.13421-1-hsiangkao@linux.alibaba.com

erofs: introduce multi-reference pclusters (fully-referenced)

2022-07-22T13:44:27+00:00

Let's introduce multi-reference pclusters at runtime. In details, if one pcluster is requested by multiple extents at almost the same time (even belong to different files), the longest extent will be decompressed as representative and the other extents are actually copied from the longest one in one round. After this patch, fully-referenced extents can be correctly handled and the full decoding check needs to be bypassed for partial-referenced extents. Acked-by: Chao Yu Signed-off-by: Gao Xiang Link: https://lore.kernel.org/r/20220715154203.48093-17-hsiangkao@linux.alibaba.com

erofs: record the longest decompressed size in this round

2022-07-21T14:55:44+00:00

Currently, `pcl->length' records the longest decompressed length as long as the pcluster itself isn't reclaimed. However, such number is unneeded for the general cases since it doesn't indicate the exact decompressed size in this round. Instead, let's record the decompressed size for this round instead, thus `pcl->nr_pages' can be completely dropped and pageofs_out is also designed to be kept in sync with `pcl->length'. Acked-by: Chao Yu Signed-off-by: Gao Xiang Link: https://lore.kernel.org/r/20220715154203.48093-16-hsiangkao@linux.alibaba.com

erofs: introduce struct z_erofs_decompress_backend

2022-07-21T14:55:22+00:00

Let's introduce struct z_erofs_decompress_backend in order to pass on the decompression backend context between helper functions more easier and avoid too many arguments. Acked-by: Chao Yu Signed-off-by: Gao Xiang Link: https://lore.kernel.org/r/20220715154203.48093-13-hsiangkao@linux.alibaba.com

erofs: get rid of `z_pagemap_global'

2022-07-21T14:55:15+00:00

In order to introduce multi-reference pclusters for compressed data deduplication, let's get rid of the global page array for now since it needs to be re-designed then at least. Acked-by: Chao Yu Signed-off-by: Gao Xiang Link: https://lore.kernel.org/r/20220715154203.48093-12-hsiangkao@linux.alibaba.com

erofs: rework online page handling

2022-07-21T14:54:46+00:00

Since all decompressed offsets have been integrated to bvecs[], this patch avoids all sub-indexes so that page->private only includes a part count and an eio flag, thus in the future folio->private can have the same meaning. In addition, PG_error will not be used anymore after this patch and we're heading to use page->private (later folio->private) and page->mapping (later folio->mapping) only. Acked-by: Chao Yu Signed-off-by: Gao Xiang Link: https://lore.kernel.org/r/20220715154203.48093-9-hsiangkao@linux.alibaba.com

erofs: switch compressed_pages[] to bufvec

2022-07-21T14:54:37+00:00

Convert compressed_pages[] to bufvec in order to avoid using page->private to keep onlinepage_index (decompressed offset) for inplace I/O pages. In the future, we only rely on folio->private to keep a countdown to unlock folios and set folio_uptodate. Acked-by: Chao Yu Signed-off-by: Gao Xiang Link: https://lore.kernel.org/r/20220715154203.48093-8-hsiangkao@linux.alibaba.com