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| author | Yue Hu <huyue2@yulong.com> | 2021-12-28 13:46:04 +0800 |
|---|---|---|
| committer | Gao Xiang <hsiangkao@linux.alibaba.com> | 2021-12-31 00:51:10 +0800 |
| commit | ab92184ff8f12979f3d3dd5ed601ed85770d81ba (patch) | |
| tree | 40b463add2daf8185d9317606644778ef0e8b20c /fs/erofs/internal.h | |
| parent | cecf864d3d76d50e3d9c58145e286a0b8c284e92 (diff) | |
| download | linux-ab92184ff8f12979f3d3dd5ed601ed85770d81ba.tar.gz linux-ab92184ff8f12979f3d3dd5ed601ed85770d81ba.tar.bz2 linux-ab92184ff8f12979f3d3dd5ed601ed85770d81ba.zip | |
erofs: add on-disk compressed tail-packing inline support
Introduces erofs compressed tail-packing inline support.
This approach adds a new field called `h_idata_size' in the
per-file compression header to indicate the encoded size of
each tail-packing pcluster.
At runtime, it will find the start logical offset of the tail
pcluster when initializing per-inode zmap and record such
extent (headlcn, idataoff) information to the in-memory inode.
Therefore, follow-on requests can directly recognize if one
pcluster is a tail-packing inline pcluster or not.
Link: https://lore.kernel.org/r/20211228054604.114518-6-hsiangkao@linux.alibaba.com
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/internal.h')
| -rw-r--r-- | fs/erofs/internal.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h index 8e70435629e5..fca3747d97be 100644 --- a/fs/erofs/internal.h +++ b/fs/erofs/internal.h @@ -274,6 +274,7 @@ EROFS_FEATURE_FUNCS(big_pcluster, incompat, INCOMPAT_BIG_PCLUSTER) EROFS_FEATURE_FUNCS(chunked_file, incompat, INCOMPAT_CHUNKED_FILE) EROFS_FEATURE_FUNCS(device_table, incompat, INCOMPAT_DEVICE_TABLE) EROFS_FEATURE_FUNCS(compr_head2, incompat, INCOMPAT_COMPR_HEAD2) +EROFS_FEATURE_FUNCS(ztailpacking, incompat, INCOMPAT_ZTAILPACKING) EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM) /* atomic flag definitions */ @@ -308,6 +309,9 @@ struct erofs_inode { unsigned short z_advise; unsigned char z_algorithmtype[2]; unsigned char z_logical_clusterbits; + unsigned long z_tailextent_headlcn; + unsigned int z_idataoff; + unsigned short z_idata_size; }; #endif /* CONFIG_EROFS_FS_ZIP */ }; @@ -421,6 +425,8 @@ struct erofs_map_blocks { #define EROFS_GET_BLOCKS_FIEMAP 0x0002 /* Used to map the whole extent if non-negligible data is requested for LZMA */ #define EROFS_GET_BLOCKS_READMORE 0x0004 +/* Used to map tail extent for tailpacking inline pcluster */ +#define EROFS_GET_BLOCKS_FINDTAIL 0x0008 enum { Z_EROFS_COMPRESSION_SHIFTED = Z_EROFS_COMPRESSION_MAX, |