fs/jfs/jfs_superblock.h

36 struct jfs_superblock {  struct
37 	char s_magic[4];	/* 4: magic number */
38 	__le32 s_version;	/* 4: version number */
40 	__le64 s_size;		/* 8: aggregate size in hardware/LVM blocks;
43 	__le32 s_bsize;		/* 4: aggregate block size in bytes;
46 	__le16 s_l2bsize;	/* 2: log2 of s_bsize */
47 	__le16 s_l2bfactor;	/* 2: log2(s_bsize/hardware block size) */
48 	__le32 s_pbsize;	/* 4: hardware/LVM block size in bytes */
49 	__le16 s_l2pbsize;	/* 2: log2 of s_pbsize */
50 	__le16 pad;		/* 2: padding necessary for alignment */
52 	__le32 s_agsize;	/* 4: allocation group size in aggr. blocks */
54 	__le32 s_flag;		/* 4: aggregate attributes:
57 	__le32 s_state;		/* 4: mount/unmount/recovery state:
60 	__le32 s_compress;		/* 4: > 0 if data compression */
62 	pxd_t s_ait2;		/* 8: first extent of secondary
66 	pxd_t s_aim2;		/* 8: first extent of secondary
69 	__le32 s_logdev;		/* 4: device address of log */
70 	__le32 s_logserial;	/* 4: log serial number at aggregate mount */
71 	pxd_t s_logpxd;		/* 8: inline log extent */
73 	pxd_t s_fsckpxd;	/* 8: inline fsck work space extent */
75 	struct timestruc_t s_time;	/* 8: time last updated */
77 	__le32 s_fsckloglen;	/* 4: Number of filesystem blocks reserved for
85 	s8 s_fscklog;		/* 1: which fsck service log is most recent
90 	char s_fpack[11];	/* 11: file system volume name
98 	__le64 s_xsize;		/* 8: extendfs s_size */
99 	pxd_t s_xfsckpxd;	/* 8: extendfs fsckpxd */
100 	pxd_t s_xlogpxd;	/* 8: extendfs logpxd */
103 	char s_uuid[16];	/* 16: 128-bit uuid for volume */
104 	char s_label[16];	/* 16: volume label */
105 	char s_loguuid[16];	/* 16: 128-bit uuid for log device */