diff options
Diffstat (limited to 'fs/xfs/libxfs/xfs_format.h')
| -rw-r--r-- | fs/xfs/libxfs/xfs_format.h | 70 |
1 files changed, 69 insertions, 1 deletions
diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h index d9b629f12c00..6aabe15786b8 100644 --- a/fs/xfs/libxfs/xfs_format.h +++ b/fs/xfs/libxfs/xfs_format.h @@ -467,6 +467,7 @@ xfs_sb_has_ro_compat_feature( #define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */ #define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */ #define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */ +#define XFS_SB_FEAT_INCOMPAT_BIGTIME (1 << 3) /* large timestamps */ #define XFS_SB_FEAT_INCOMPAT_ALL \ (XFS_SB_FEAT_INCOMPAT_FTYPE| \ XFS_SB_FEAT_INCOMPAT_SPINODES| \ @@ -565,6 +566,12 @@ static inline bool xfs_sb_version_hasreflink(struct xfs_sb *sbp) (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_REFLINK); } +static inline bool xfs_sb_version_hasbigtime(struct xfs_sb *sbp) +{ + return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && + (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_BIGTIME); +} + /* * Inode btree block counter. We record the number of inobt and finobt blocks * in the AGI header so that we can skip the finobt walk at mount time when @@ -858,6 +865,13 @@ struct xfs_agfl { * Therefore, the ondisk min and max defined here can be used directly to * constrain the incore timestamps on a Unix system. Note that we actually * encode a __be64 value on disk. + * + * When the bigtime feature is enabled, ondisk inode timestamps become an + * unsigned 64-bit nanoseconds counter. This means that the bigtime inode + * timestamp epoch is the start of the classic timestamp range, which is + * Dec 31 20:45:52 UTC 1901. Because the epochs are not the same, callers + * /must/ use the bigtime conversion functions when encoding and decoding raw + * timestamps. */ typedef __be64 xfs_timestamp_t; @@ -880,6 +894,50 @@ struct xfs_legacy_timestamp { #define XFS_LEGACY_TIME_MAX ((int64_t)S32_MAX) /* + * Smallest possible ondisk seconds value with bigtime timestamps. This + * corresponds (after conversion to a Unix timestamp) with the traditional + * minimum timestamp of Dec 13 20:45:52 UTC 1901. + */ +#define XFS_BIGTIME_TIME_MIN ((int64_t)0) + +/* + * Largest supported ondisk seconds value with bigtime timestamps. This + * corresponds (after conversion to a Unix timestamp) with an incore timestamp + * of Jul 2 20:20:24 UTC 2486. + * + * We round down the ondisk limit so that the bigtime quota and inode max + * timestamps will be the same. + */ +#define XFS_BIGTIME_TIME_MAX ((int64_t)((-1ULL / NSEC_PER_SEC) & ~0x3ULL)) + +/* + * Bigtime epoch is set exactly to the minimum time value that a traditional + * 32-bit timestamp can represent when using the Unix epoch as a reference. + * Hence the Unix epoch is at a fixed offset into the supported bigtime + * timestamp range. + * + * The bigtime epoch also matches the minimum value an on-disk 32-bit XFS + * timestamp can represent so we will not lose any fidelity in converting + * to/from unix and bigtime timestamps. + * + * The following conversion factor converts a seconds counter from the Unix + * epoch to the bigtime epoch. + */ +#define XFS_BIGTIME_EPOCH_OFFSET (-(int64_t)S32_MIN) + +/* Convert a timestamp from the Unix epoch to the bigtime epoch. */ +static inline uint64_t xfs_unix_to_bigtime(time64_t unix_seconds) +{ + return (uint64_t)unix_seconds + XFS_BIGTIME_EPOCH_OFFSET; +} + +/* Convert a timestamp from the bigtime epoch to the Unix epoch. */ +static inline time64_t xfs_bigtime_to_unix(uint64_t ondisk_seconds) +{ + return (time64_t)ondisk_seconds - XFS_BIGTIME_EPOCH_OFFSET; +} + +/* * On-disk inode structure. * * This is just the header or "dinode core", the inode is expanded to fill a @@ -1104,12 +1162,22 @@ static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev) #define XFS_DIFLAG2_DAX_BIT 0 /* use DAX for this inode */ #define XFS_DIFLAG2_REFLINK_BIT 1 /* file's blocks may be shared */ #define XFS_DIFLAG2_COWEXTSIZE_BIT 2 /* copy on write extent size hint */ +#define XFS_DIFLAG2_BIGTIME_BIT 3 /* big timestamps */ + #define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT) #define XFS_DIFLAG2_REFLINK (1 << XFS_DIFLAG2_REFLINK_BIT) #define XFS_DIFLAG2_COWEXTSIZE (1 << XFS_DIFLAG2_COWEXTSIZE_BIT) +#define XFS_DIFLAG2_BIGTIME (1 << XFS_DIFLAG2_BIGTIME_BIT) #define XFS_DIFLAG2_ANY \ - (XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE) + (XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE | \ + XFS_DIFLAG2_BIGTIME) + +static inline bool xfs_dinode_has_bigtime(const struct xfs_dinode *dip) +{ + return dip->di_version >= 3 && + (dip->di_flags2 & cpu_to_be64(XFS_DIFLAG2_BIGTIME)); +} /* * Inode number format: |