diff options
| author | Gao Xiang <hsiangkao@redhat.com> | 2021-04-07 12:39:22 +0800 |
|---|---|---|
| committer | Gao Xiang <hsiangkao@redhat.com> | 2021-04-10 03:20:17 +0800 |
| commit | 5404c33010cb8ee063c05376d4a2eba129872281 (patch) | |
| tree | a852d5fb7a705a3a0776d0a5cfe2ffbb8f959f76 /fs/erofs/erofs_fs.h | |
| parent | 81382f5f5cb0c9c5694c19d36460f757a8c96841 (diff) | |
erofs: add big physical cluster definition
Big pcluster indicates the size of compressed data for each physical
pcluster is no longer fixed as block size, but could be more than 1
block (more accurately, 1 logical pcluster)
When big pcluster feature is enabled for head0/1, delta0 of the 1st
non-head lcluster index will keep block count of this pcluster in
lcluster size instead of 1. Or, the compressed size of pcluster
should be 1 lcluster if pcluster has no non-head lcluster index.
Also note that BIG_PCLUSTER feature reuses COMPR_CFGS feature since
it depends on COMPR_CFGS and will be released together.
Link: https://lore.kernel.org/r/20210407043927.10623-6-xiang@kernel.org
Acked-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
Diffstat (limited to 'fs/erofs/erofs_fs.h')
| -rw-r--r-- | fs/erofs/erofs_fs.h | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/fs/erofs/erofs_fs.h b/fs/erofs/erofs_fs.h index 76777673eb63..ecc3a0ea0bc4 100644 --- a/fs/erofs/erofs_fs.h +++ b/fs/erofs/erofs_fs.h @@ -19,6 +19,7 @@ */ #define EROFS_FEATURE_INCOMPAT_LZ4_0PADDING 0x00000001 #define EROFS_FEATURE_INCOMPAT_COMPR_CFGS 0x00000002 +#define EROFS_FEATURE_INCOMPAT_BIG_PCLUSTER 0x00000002 #define EROFS_ALL_FEATURE_INCOMPAT EROFS_FEATURE_INCOMPAT_LZ4_0PADDING #define EROFS_SB_EXTSLOT_SIZE 16 @@ -214,17 +215,20 @@ enum { /* 14 bytes (+ length field = 16 bytes) */ struct z_erofs_lz4_cfgs { __le16 max_distance; - u8 reserved[12]; + __le16 max_pclusterblks; + u8 reserved[10]; } __packed; /* * bit 0 : COMPACTED_2B indexes (0 - off; 1 - on) * e.g. for 4k logical cluster size, 4B if compacted 2B is off; * (4B) + 2B + (4B) if compacted 2B is on. + * bit 1 : HEAD1 big pcluster (0 - off; 1 - on) + * bit 2 : HEAD2 big pcluster (0 - off; 1 - on) */ -#define Z_EROFS_ADVISE_COMPACTED_2B_BIT 0 - -#define Z_EROFS_ADVISE_COMPACTED_2B (1 << Z_EROFS_ADVISE_COMPACTED_2B_BIT) +#define Z_EROFS_ADVISE_COMPACTED_2B 0x0001 +#define Z_EROFS_ADVISE_BIG_PCLUSTER_1 0x0002 +#define Z_EROFS_ADVISE_BIG_PCLUSTER_2 0x0004 struct z_erofs_map_header { __le32 h_reserved1; @@ -279,6 +283,13 @@ enum { #define Z_EROFS_VLE_DI_CLUSTER_TYPE_BITS 2 #define Z_EROFS_VLE_DI_CLUSTER_TYPE_BIT 0 +/* + * 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. + * block count of a pcluster). + */ +#define Z_EROFS_VLE_DI_D0_CBLKCNT (1 << 11) + struct z_erofs_vle_decompressed_index { __le16 di_advise; /* where to decompress in the head cluster */ |