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| author | Gao Xiang <hsiangkao@linux.alibaba.com> | 2022-09-23 03:49:15 +0200 |
|---|---|---|
| committer | Gao Xiang <hsiangkao@linux.alibaba.com> | 2022-09-26 17:55:43 +0200 |
| commit | 5c2a64252c5dc4cfe78e5b2a531c118894e3d155 (patch) | |
| tree | 356748bce348364c288493b9eeb9de8994b1a95e /fs/erofs/erofs_fs.h | |
| parent | erofs: support on-disk compressed fragments data (diff) | |
| download | linux-5c2a64252c5dc4cfe78e5b2a531c118894e3d155.tar.xz linux-5c2a64252c5dc4cfe78e5b2a531c118894e3d155.zip | |
erofs: introduce partial-referenced pclusters
Due to deduplication for compressed data, pclusters can be partially
referenced with their prefixes.
Together with the user-space implementation, it enables EROFS
variable-length global compressed data deduplication with rolling
hash.
Link: https://lore.kernel.org/r/20220923014915.4362-1-hsiangkao@linux.alibaba.com
Reviewed-by: Yue Hu <huyue2@coolpad.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Diffstat (limited to 'fs/erofs/erofs_fs.h')
| -rw-r--r-- | fs/erofs/erofs_fs.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/erofs/erofs_fs.h b/fs/erofs/erofs_fs.h index b5d763aa8ff0..dbcd24371002 100644 --- a/fs/erofs/erofs_fs.h +++ b/fs/erofs/erofs_fs.h @@ -26,6 +26,7 @@ #define EROFS_FEATURE_INCOMPAT_COMPR_HEAD2 0x00000008 #define EROFS_FEATURE_INCOMPAT_ZTAILPACKING 0x00000010 #define EROFS_FEATURE_INCOMPAT_FRAGMENTS 0x00000020 +#define EROFS_FEATURE_INCOMPAT_DEDUPE 0x00000020 #define EROFS_ALL_FEATURE_INCOMPAT \ (EROFS_FEATURE_INCOMPAT_ZERO_PADDING | \ EROFS_FEATURE_INCOMPAT_COMPR_CFGS | \ @@ -34,7 +35,8 @@ EROFS_FEATURE_INCOMPAT_DEVICE_TABLE | \ EROFS_FEATURE_INCOMPAT_COMPR_HEAD2 | \ EROFS_FEATURE_INCOMPAT_ZTAILPACKING | \ - EROFS_FEATURE_INCOMPAT_FRAGMENTS) + EROFS_FEATURE_INCOMPAT_FRAGMENTS | \ + EROFS_FEATURE_INCOMPAT_DEDUPE) #define EROFS_SB_EXTSLOT_SIZE 16 @@ -371,6 +373,9 @@ enum { #define Z_EROFS_VLE_DI_CLUSTER_TYPE_BITS 2 #define Z_EROFS_VLE_DI_CLUSTER_TYPE_BIT 0 +/* (noncompact only, HEAD) This pcluster refers to partial decompressed data */ +#define Z_EROFS_VLE_DI_PARTIAL_REF (1 << 15) + /* * D0_CBLKCNT will be marked _only_ at the 1st non-head lcluster to store the * compressed block count of a compressed extent (in logical clusters, aka. |