diff options
Diffstat (limited to 'fs/erofs/erofs_fs.h')
| -rw-r--r-- | fs/erofs/erofs_fs.h | 39 |
1 files changed, 20 insertions, 19 deletions
diff --git a/fs/erofs/erofs_fs.h b/fs/erofs/erofs_fs.h index e480b3854d88..1c2917181346 100644 --- a/fs/erofs/erofs_fs.h +++ b/fs/erofs/erofs_fs.h @@ -22,12 +22,14 @@ #define EROFS_FEATURE_INCOMPAT_BIG_PCLUSTER 0x00000002 #define EROFS_FEATURE_INCOMPAT_CHUNKED_FILE 0x00000004 #define EROFS_FEATURE_INCOMPAT_DEVICE_TABLE 0x00000008 +#define EROFS_FEATURE_INCOMPAT_COMPR_HEAD2 0x00000008 #define EROFS_ALL_FEATURE_INCOMPAT \ (EROFS_FEATURE_INCOMPAT_LZ4_0PADDING | \ EROFS_FEATURE_INCOMPAT_COMPR_CFGS | \ EROFS_FEATURE_INCOMPAT_BIG_PCLUSTER | \ EROFS_FEATURE_INCOMPAT_CHUNKED_FILE | \ - EROFS_FEATURE_INCOMPAT_DEVICE_TABLE) + EROFS_FEATURE_INCOMPAT_DEVICE_TABLE | \ + EROFS_FEATURE_INCOMPAT_COMPR_HEAD2) #define EROFS_SB_EXTSLOT_SIZE 16 @@ -303,35 +305,34 @@ struct z_erofs_map_header { #define Z_EROFS_VLE_LEGACY_HEADER_PADDING 8 /* - * Fixed-sized output compression ondisk Logical Extent cluster type: - * 0 - literal (uncompressed) cluster - * 1 - compressed cluster (for the head logical cluster) - * 2 - compressed cluster (for the other logical clusters) + * Fixed-sized output compression on-disk logical cluster type: + * 0 - literal (uncompressed) lcluster + * 1,3 - compressed lcluster (for HEAD lclusters) + * 2 - compressed lcluster (for NONHEAD lclusters) * * In detail, - * 0 - literal (uncompressed) cluster, + * 0 - literal (uncompressed) lcluster, * di_advise = 0 - * di_clusterofs = the literal data offset of the cluster - * di_blkaddr = the blkaddr of the literal cluster + * di_clusterofs = the literal data offset of the lcluster + * di_blkaddr = the blkaddr of the literal pcluster * - * 1 - compressed cluster (for the head logical cluster) - * di_advise = 1 - * di_clusterofs = the decompressed data offset of the cluster - * di_blkaddr = the blkaddr of the compressed cluster + * 1,3 - compressed lcluster (for HEAD lclusters) + * di_advise = 1 or 3 + * di_clusterofs = the decompressed data offset of the lcluster + * di_blkaddr = the blkaddr of the compressed pcluster * - * 2 - compressed cluster (for the other logical clusters) + * 2 - compressed lcluster (for NONHEAD lclusters) * di_advise = 2 * di_clusterofs = - * the decompressed data offset in its own head cluster - * di_u.delta[0] = distance to its corresponding head cluster - * di_u.delta[1] = distance to its corresponding tail cluster - * (di_advise could be 0, 1 or 2) + * the decompressed data offset in its own HEAD lcluster + * di_u.delta[0] = distance to this HEAD lcluster + * di_u.delta[1] = distance to the next HEAD lcluster */ enum { Z_EROFS_VLE_CLUSTER_TYPE_PLAIN = 0, - Z_EROFS_VLE_CLUSTER_TYPE_HEAD = 1, + Z_EROFS_VLE_CLUSTER_TYPE_HEAD1 = 1, Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD = 2, - Z_EROFS_VLE_CLUSTER_TYPE_RESERVED = 3, + Z_EROFS_VLE_CLUSTER_TYPE_HEAD2 = 3, Z_EROFS_VLE_CLUSTER_TYPE_MAX }; |