diff options
Diffstat (limited to 'fs/xfs/libxfs/xfs_format.h')
| -rw-r--r-- | fs/xfs/libxfs/xfs_format.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h index fe129fe16d5f..e57360a8fd16 100644 --- a/fs/xfs/libxfs/xfs_format.h +++ b/fs/xfs/libxfs/xfs_format.h @@ -848,12 +848,34 @@ struct xfs_agfl { ASSERT(xfs_daddr_to_agno(mp, d) == \ xfs_daddr_to_agno(mp, (d) + (len) - 1))) +/* + * XFS Timestamps + * ============== + * + * Traditional ondisk inode timestamps consist of signed 32-bit counters for + * seconds and nanoseconds; time zero is the Unix epoch, Jan 1 00:00:00 UTC + * 1970, which means that the timestamp epoch is the same as the Unix epoch. + * Therefore, the ondisk min and max defined here can be used directly to + * constrain the incore timestamps on a Unix system. + */ typedef struct xfs_timestamp { __be32 t_sec; /* timestamp seconds */ __be32 t_nsec; /* timestamp nanoseconds */ } xfs_timestamp_t; /* + * Smallest possible ondisk seconds value with traditional timestamps. This + * corresponds exactly with the incore timestamp Dec 13 20:45:52 UTC 1901. + */ +#define XFS_LEGACY_TIME_MIN ((int64_t)S32_MIN) + +/* + * Largest possible ondisk seconds value with traditional timestamps. This + * corresponds exactly with the incore timestamp Jan 19 03:14:07 UTC 2038. + */ +#define XFS_LEGACY_TIME_MAX ((int64_t)S32_MAX) + +/* * On-disk inode structure. * * This is just the header or "dinode core", the inode is expanded to fill a |