On Mon, Sep 23, 2013 at 11:34:15AM +0800, Li Zhong wrote:
> It would be a little bit easier if somebody uses something like hexdump
> to check the superblock of one device.
NACK. If you want this information, use pahole.
Cheers,
Dave.
$ pahole fs/xfs/xfs_sb.o |grep -A 61 "struct xfs_dsb"
struct xfs_dsb {
__be32 sb_magicnum; /* 0 4 */
__be32 sb_blocksize; /* 4 4 */
__be64 sb_dblocks; /* 8 8 */
__be64 sb_rblocks; /* 16 8 */
__be64 sb_rextents; /* 24 8 */
uuid_t sb_uuid; /* 32 16 */
__be64 sb_logstart; /* 48 8 */
__be64 sb_rootino; /* 56 8 */
/* --- cacheline 1 boundary (64 bytes) --- */
__be64 sb_rbmino; /* 64 8 */
__be64 sb_rsumino; /* 72 8 */
__be32 sb_rextsize; /* 80 4 */
__be32 sb_agblocks; /* 84 4 */
__be32 sb_agcount; /* 88 4 */
__be32 sb_rbmblocks; /* 92 4 */
__be32 sb_logblocks; /* 96 4 */
__be16 sb_versionnum; /* 100 2 */
__be16 sb_sectsize; /* 102 2 */
__be16 sb_inodesize; /* 104 2 */
__be16 sb_inopblock; /* 106 2 */
char sb_fname[12]; /* 108 12 */
__u8 sb_blocklog; /* 120 1 */
__u8 sb_sectlog; /* 121 1 */
__u8 sb_inodelog; /* 122 1 */
__u8 sb_inopblog; /* 123 1 */
__u8 sb_agblklog; /* 124 1 */
__u8 sb_rextslog; /* 125 1 */
__u8 sb_inprogress; /* 126 1 */
__u8 sb_imax_pct; /* 127 1 */
/* --- cacheline 2 boundary (128 bytes) --- */
__be64 sb_icount; /* 128 8 */
__be64 sb_ifree; /* 136 8 */
__be64 sb_fdblocks; /* 144 8 */
__be64 sb_frextents; /* 152 8 */
__be64 sb_uquotino; /* 160 8 */
__be64 sb_gquotino; /* 168 8 */
__be16 sb_qflags; /* 176 2 */
__u8 sb_flags; /* 178 1 */
__u8 sb_shared_vn; /* 179 1 */
__be32 sb_inoalignmt; /* 180 4 */
__be32 sb_unit; /* 184 4 */
__be32 sb_width; /* 188 4 */
/* --- cacheline 3 boundary (192 bytes) --- */
__u8 sb_dirblklog; /* 192 1 */
__u8 sb_logsectlog; /* 193 1 */
__be16 sb_logsectsize; /* 194 2 */
__be32 sb_logsunit; /* 196 4 */
__be32 sb_features2; /* 200 4 */
__be32 sb_bad_features2; /* 204 4 */
__be32 sb_features_compat; /* 208 4 */
__be32 sb_features_ro_compat; /* 212 4 */
__be32 sb_features_incompat; /* 216 4 */
__be32 sb_features_log_incompat; /* 220 4 */
__le32 sb_crc; /* 224 4 */
__be32 sb_pad; /* 228 4 */
__be64 sb_pquotino; /* 232 8 */
__be64 sb_lsn; /* 240 8 */
/* size: 248, cachelines: 4, members: 54 */
/* last cacheline: 56 bytes */
};
--
Dave Chinner
david@xxxxxxxxxxxxx
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