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| author | Yue Hu <huyue2@yulong.com> | 2021-12-29 07:29:19 +0800 |
|---|---|---|
| committer | Gao Xiang <hsiangkao@linux.alibaba.com> | 2021-12-31 00:50:50 +0800 |
| commit | cecf864d3d76d50e3d9c58145e286a0b8c284e92 (patch) | |
| tree | 05934d21aafe3b7fa7ac4cfab88cdad7ce8abda9 /fs/erofs/zdata.h | |
| parent | ab749badf9f41f32509cd103391b81ea7e684b76 (diff) | |
| download | linux-cecf864d3d76d50e3d9c58145e286a0b8c284e92.tar.bz2 | |
erofs: support inline data decompression
Currently, we have already support tail-packing inline for
uncompressed file, let's also implement this for compressed
files to save I/Os and storage space.
Different from normal pclusters, compressed data is available
in advance because of other metadata I/Os. Therefore, they
directly move into the bypass queue without extra I/O submission.
It's the last compression feature before folio/subpage support.
Link: https://lore.kernel.org/r/20211228232919.21413-1-xiang@kernel.org
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Yue Hu <huyue2@yulong.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Diffstat (limited to 'fs/erofs/zdata.h')
| -rw-r--r-- | fs/erofs/zdata.h | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/fs/erofs/zdata.h b/fs/erofs/zdata.h index 4a69515dea75..e043216b545f 100644 --- a/fs/erofs/zdata.h +++ b/fs/erofs/zdata.h @@ -62,8 +62,16 @@ struct z_erofs_pcluster { /* A: lower limit of decompressed length and if full length or not */ unsigned int length; - /* I: physical cluster size in pages */ - unsigned short pclusterpages; + /* I: page offset of inline compressed data */ + unsigned short pageofs_in; + + union { + /* I: physical cluster size in pages */ + unsigned short pclusterpages; + + /* I: tailpacking inline compressed size */ + unsigned short tailpacking_size; + }; /* I: compression algorithm format */ unsigned char algorithmformat; @@ -94,6 +102,18 @@ struct z_erofs_decompressqueue { } u; }; +static inline bool z_erofs_is_inline_pcluster(struct z_erofs_pcluster *pcl) +{ + return !pcl->obj.index; +} + +static inline unsigned int z_erofs_pclusterpages(struct z_erofs_pcluster *pcl) +{ + if (z_erofs_is_inline_pcluster(pcl)) + return 1; + return pcl->pclusterpages; +} + #define Z_EROFS_ONLINEPAGE_COUNT_BITS 2 #define Z_EROFS_ONLINEPAGE_COUNT_MASK ((1 << Z_EROFS_ONLINEPAGE_COUNT_BITS) - 1) #define Z_EROFS_ONLINEPAGE_INDEX_SHIFT (Z_EROFS_ONLINEPAGE_COUNT_BITS) |