| #ifndef __NILFS_FS_H |
| #define __NILFS_FS_H |
| |
| #define NILFS_SUPER_MAGIC 0x3434 /* NILFS filesystem magic number */ |
| |
| /* |
| * struct nilfs_super_block - structure of super block on disk |
| */ |
| struct nilfs_super_block { |
| __le32 s_rev_level; /* Revision level */ |
| __le16 s_minor_rev_level; /* minor revision level */ |
| __le16 s_magic; /* Magic signature */ |
| |
| __le16 s_bytes; /* Bytes count of CRC calculation |
| for this structure. s_reserved |
| is excluded. */ |
| __le16 s_flags; /* flags */ |
| __le32 s_crc_seed; /* Seed value of CRC calculation */ |
| __le32 s_sum; /* Check sum of super block */ |
| |
| __le32 s_log_block_size; /* Block size represented as follows |
| blocksize = 1 << (s_log_block_size + 10) */ |
| __le64 s_nsegments; /* Number of segments in filesystem */ |
| __le64 s_dev_size; /* block device size in bytes */ |
| __le64 s_first_data_block; /* 1st seg disk block number */ |
| __le32 s_blocks_per_segment; /* number of blocks per full segment */ |
| __le32 s_r_segments_percentage;/* Reserved segments percentage */ /* or __le16 */ |
| |
| __le64 s_last_cno; /* Last checkpoint number */ |
| __le64 s_last_pseg; /* disk block addr pseg written last */ |
| __le64 s_last_seq; /* seq. number of seg written last */ |
| __le64 s_free_blocks_count; /* Free blocks count */ |
| |
| __le64 s_ctime; /* Creation time (execution time of newfs) */ |
| __le64 s_mtime; /* Mount time */ |
| __le64 s_wtime; /* Write time */ |
| __le16 s_mnt_count; /* Mount count */ |
| __le16 s_max_mnt_count; /* Maximal mount count */ |
| __le16 s_state; /* File system state */ |
| __le16 s_errors; /* Behaviour when detecting errors */ |
| __le64 s_lastcheck; /* time of last check */ |
| |
| __le32 s_checkinterval; /* max. time between checks */ |
| __le32 s_creator_os; /* OS */ |
| __le16 s_def_resuid; /* Default uid for reserved blocks */ |
| __le16 s_def_resgid; /* Default gid for reserved blocks */ |
| __le32 s_first_ino; /* First non-reserved inode */ /* or __le16 */ |
| |
| __le16 s_inode_size; /* Size of an inode */ |
| __le16 s_dat_entry_size; /* Size of a dat entry */ |
| __le16 s_checkpoint_size; /* Size of a checkpoint */ |
| __le16 s_segment_usage_size; /* Size of a segment usage */ |
| |
| __u8 s_uuid[16]; /* 128-bit uuid for volume */ |
| char s_volume_name[16]; /* volume name */ |
| char s_last_mounted[64]; /* directory where last mounted */ |
| |
| __le32 s_c_interval; /* Commit interval of segment */ |
| __le32 s_c_block_max; /* Threshold of data amount for |
| the segment construction */ |
| __u32 s_reserved[192]; /* padding to the end of the block */ |
| }; |
| |
| #endif /* __NILFS_FS_H */ |
