diff options
Diffstat (limited to 'include/linux/nilfs2_fs.h')
| -rw-r--r-- | include/linux/nilfs2_fs.h | 65 |
1 files changed, 51 insertions, 14 deletions
diff --git a/include/linux/nilfs2_fs.h b/include/linux/nilfs2_fs.h index 8c2c6116e788..f5487b6f91ed 100644 --- a/include/linux/nilfs2_fs.h +++ b/include/linux/nilfs2_fs.h @@ -160,7 +160,7 @@ struct nilfs_super_root { * struct nilfs_super_block - structure of super block on disk */ struct nilfs_super_block { - __le32 s_rev_level; /* Revision level */ +/*00*/ __le32 s_rev_level; /* Revision level */ __le16 s_minor_rev_level; /* minor revision level */ __le16 s_magic; /* Magic signature */ @@ -169,50 +169,53 @@ struct nilfs_super_block { is excluded. */ __le16 s_flags; /* flags */ __le32 s_crc_seed; /* Seed value of CRC calculation */ - __le32 s_sum; /* Check sum of super block */ +/*10*/ __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 */ +/*20*/ __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 */ +/*30*/ __le32 s_blocks_per_segment; /* number of blocks per full segment */ __le32 s_r_segments_percentage; /* Reserved segments percentage */ __le64 s_last_cno; /* Last checkpoint number */ - __le64 s_last_pseg; /* disk block addr pseg written last */ +/*40*/ __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 */ +/*50*/ __le64 s_free_blocks_count; /* Free blocks count */ __le64 s_ctime; /* Creation time (execution time of newfs) */ - __le64 s_mtime; /* Mount time */ +/*60*/ __le64 s_mtime; /* Mount time */ __le64 s_wtime; /* Write time */ - __le16 s_mnt_count; /* Mount count */ +/*70*/ __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 */ +/*80*/ __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 */ - __le16 s_inode_size; /* Size of an inode */ +/*90*/ __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[80]; /* volume name */ +/*98*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ +/*A8*/ char s_volume_name[80]; /* volume name */ - __le32 s_c_interval; /* Commit interval of segment */ +/*F8*/ __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 */ +/*100*/ __le64 s_feature_compat; /* Compatible feature set */ + __le64 s_feature_compat_ro; /* Read-only compatible feature set */ + __le64 s_feature_incompat; /* Incompatible feature set */ + __u32 s_reserved[186]; /* padding to the end of the block */ }; /* @@ -228,6 +231,16 @@ struct nilfs_super_block { #define NILFS_MINOR_REV 0 /* minor revision */ /* + * Feature set definitions + * + * If there is a bit set in the incompatible feature set that the kernel + * doesn't know about, it should refuse to mount the filesystem. + */ +#define NILFS_FEATURE_COMPAT_SUPP 0ULL +#define NILFS_FEATURE_COMPAT_RO_SUPP 0ULL +#define NILFS_FEATURE_INCOMPAT_SUPP 0ULL + +/* * Bytes count of super_block for CRC-calculation */ #define NILFS_SB_BYTES \ @@ -274,6 +287,12 @@ struct nilfs_super_block { #define NILFS_NAME_LEN 255 /* + * Block size limitations + */ +#define NILFS_MIN_BLOCK_SIZE 1024 +#define NILFS_MAX_BLOCK_SIZE 65536 + +/* * The new version of the directory entry. Since V0 structures are * stored in intel byte order, and the name_len field could never be * bigger than 255 chars, it's safe to reclaim the extra byte for the @@ -313,7 +332,25 @@ enum { #define NILFS_DIR_ROUND (NILFS_DIR_PAD - 1) #define NILFS_DIR_REC_LEN(name_len) (((name_len) + 12 + NILFS_DIR_ROUND) & \ ~NILFS_DIR_ROUND) +#define NILFS_MAX_REC_LEN ((1<<16)-1) +static inline unsigned nilfs_rec_len_from_disk(__le16 dlen) +{ + unsigned len = le16_to_cpu(dlen); + + if (len == NILFS_MAX_REC_LEN) + return 1 << 16; + return len; +} + +static inline __le16 nilfs_rec_len_to_disk(unsigned len) +{ + if (len == (1 << 16)) + return cpu_to_le16(NILFS_MAX_REC_LEN); + else if (len > (1 << 16)) + BUG(); + return cpu_to_le16(len); +} /** * struct nilfs_finfo - file information |