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Commit 2f1b7cd2 authored by Ryusuke Konishi's avatar Ryusuke Konishi
Browse files

nilfs2: clarify byte offset in super block format 



This inserts comments indicating hexadecimal offset in declaration of
nilfs_super_block structure so that people can know offset of its
fields without counting from the head.

Signed-off-by: default avatarRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
parent 03bdb5ac

include/linux/nilfs2_fs.h

+13 −13
Original line number Original line Diff line number Diff line
@@ -160,7 +160,7 @@ struct nilfs_super_root { 
 * struct nilfs_super_block - structure of super block on disk

 * struct nilfs_super_block - structure of super block on disk

 */

 */

struct nilfs_super_block {

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_minor_rev_level;	/* minor revision level */

	__le16	s_magic;		/* Magic signature */

	__le16	s_magic;		/* Magic signature */
@@ -169,47 +169,47 @@ struct nilfs_super_block { 
					   is excluded. */

					   is excluded. */

	__le16  s_flags;		/* flags */

	__le16  s_flags;		/* flags */

	__le32  s_crc_seed;		/* Seed value of CRC calculation */

	__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

	__le32	s_log_block_size;	/* Block size represented as follows

					   blocksize =

					   blocksize =

					       1 << (s_log_block_size + 10) */

					       1 << (s_log_block_size + 10) */

	__le64  s_nsegments;		/* Number of segments in filesystem */

	__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 */

	__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 */

	__le32	s_r_segments_percentage; /* Reserved segments percentage */





	__le64  s_last_cno;		/* Last checkpoint number */

	__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_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

	__le64	s_ctime;		/* Creation time (execution time of

					   newfs) */

					   newfs) */

	__le64	s_mtime;		/* Mount time */

/*60*/	__le64	s_mtime;		/* Mount time */

	__le64	s_wtime;		/* Write 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_max_mnt_count;	/* Maximal mount count */

	__le16	s_state;		/* File system state */

	__le16	s_state;		/* File system state */

	__le16	s_errors;		/* Behaviour when detecting errors */

	__le16	s_errors;		/* Behaviour when detecting errors */

	__le64	s_lastcheck;		/* time of last check */

	__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 */

	__le32	s_creator_os;		/* OS */

	__le16	s_def_resuid;		/* Default uid for reserved blocks */

	__le16	s_def_resuid;		/* Default uid for reserved blocks */

	__le16	s_def_resgid;		/* Default gid for reserved blocks */

	__le16	s_def_resgid;		/* Default gid for reserved blocks */

	__le32	s_first_ino;		/* First non-reserved inode */

	__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_dat_entry_size;       /* Size of a dat entry */

	__le16  s_checkpoint_size;      /* Size of a checkpoint */

	__le16  s_checkpoint_size;      /* Size of a checkpoint */

	__le16	s_segment_usage_size;	/* Size of a segment usage */

	__le16	s_segment_usage_size;	/* Size of a segment usage */





	__u8	s_uuid[16];		/* 128-bit uuid for volume */

/*98*/	__u8	s_uuid[16];		/* 128-bit uuid for volume */

	char	s_volume_name[80];	/* volume name */

/*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

	__le32  s_c_block_max;          /* Threshold of data amount for

					   the segment construction */

					   the segment construction */

	__u32	s_reserved[192];	/* padding to the end of the block */

	__u32	s_reserved[192];	/* padding to the end of the block */