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| author | Gao Xiang <hsiangkao@linux.alibaba.com> | 2022-09-23 04:49:15 +0300 |
|---|---|---|
| committer | Gao Xiang <hsiangkao@linux.alibaba.com> | 2022-09-26 18:55:43 +0300 |
| commit | 5c2a64252c5dc4cfe78e5b2a531c118894e3d155 (patch) | |
| tree | 356748bce348364c288493b9eeb9de8994b1a95e /fs/erofs/internal.h | |
| parent | b15b2e307c3a1970d92da77a3ef57ee53d119d8e (diff) | |
| download | linux-5c2a64252c5dc4cfe78e5b2a531c118894e3d155.tar.xz | |
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/internal.h')
| -rw-r--r-- | fs/erofs/internal.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h index 9f89c1da6229..a6333c283e3d 100644 --- a/fs/erofs/internal.h +++ b/fs/erofs/internal.h @@ -291,6 +291,7 @@ 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(fragments, incompat, INCOMPAT_FRAGMENTS) +EROFS_FEATURE_FUNCS(dedupe, incompat, INCOMPAT_DEDUPE) EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM) /* atomic flag definitions */ @@ -392,6 +393,7 @@ enum { BH_Encoded = BH_PrivateStart, BH_FullMapped, BH_Fragment, + BH_Partialref, }; /* Has a disk mapping */ @@ -404,6 +406,8 @@ enum { #define EROFS_MAP_FULL_MAPPED (1 << BH_FullMapped) /* Located in the special packed inode */ #define EROFS_MAP_FRAGMENT (1 << BH_Fragment) +/* The extent refers to partial decompressed data */ +#define EROFS_MAP_PARTIAL_REF (1 << BH_Partialref) struct erofs_map_blocks { struct erofs_buf buf; |