diff options
Diffstat (limited to 'fs/erofs/erofs_fs.h')
| -rw-r--r-- | fs/erofs/erofs_fs.h | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/fs/erofs/erofs_fs.h b/fs/erofs/erofs_fs.h index 700597e9c810..17bc0b5f117d 100644 --- a/fs/erofs/erofs_fs.h +++ b/fs/erofs/erofs_fs.h @@ -18,15 +18,18 @@ * be incompatible with this kernel version. */ #define EROFS_FEATURE_INCOMPAT_LZ4_0PADDING 0x00000001 +#define EROFS_FEATURE_INCOMPAT_COMPR_CFGS 0x00000002 #define EROFS_ALL_FEATURE_INCOMPAT EROFS_FEATURE_INCOMPAT_LZ4_0PADDING -/* 128-byte erofs on-disk super block */ +#define EROFS_SB_EXTSLOT_SIZE 16 + +/* erofs on-disk super block (currently 128 bytes) */ struct erofs_super_block { __le32 magic; /* file system magic number */ __le32 checksum; /* crc32c(super_block) */ __le32 feature_compat; __u8 blkszbits; /* support block_size == PAGE_SIZE only */ - __u8 reserved; + __u8 sb_extslots; /* superblock size = 128 + sb_extslots * 16 */ __le16 root_nid; /* nid of root directory */ __le64 inos; /* total valid ino # (== f_files - f_favail) */ @@ -39,8 +42,12 @@ struct erofs_super_block { __u8 uuid[16]; /* 128-bit uuid for volume */ __u8 volume_name[16]; /* volume name */ __le32 feature_incompat; - /* customized lz4 sliding window size instead of 64k by default */ - __le16 lz4_max_distance; + union { + /* bitmap for available compression algorithms */ + __le16 available_compr_algs; + /* customized sliding window size instead of 64k by default */ + __le16 lz4_max_distance; + } __packed u1; __u8 reserved2[42]; }; @@ -199,6 +206,7 @@ enum { Z_EROFS_COMPRESSION_LZ4 = 0, Z_EROFS_COMPRESSION_MAX }; +#define Z_EROFS_ALL_COMPR_ALGS (1 << (Z_EROFS_COMPRESSION_MAX - 1)) /* 14 bytes (+ length field = 16 bytes) */ struct z_erofs_lz4_cfgs { |