Hi all, This series performs some refactoring of our timestamp and inode encoding functions, then retrofits the timestamp union to handle timestamps as a 64-bit nanosecond counter. Next, it adds bit shifting to the non-root dquot timer fields to boost their effective size to 34 bits. These two changes enable correct time handling on XFS through the year 2486. On a current V5 filesystem, inodes timestamps are a signed 32-bit seconds counter, with 0 being the Unix epoch. Quota timers are an unsigned 32-bit seconds counter, with 0 also being the Unix epoch. This means that inode timestamps can range from: -(2^31-1) (13 Dec 1901) through (2^31-1) (19 Jan 2038). And quota timers can range from: 0 (1 Jan 1970) through (2^32-1) (7 Feb 2106). With the bigtime encoding turned on, inode timestamps are an unsigned 64-bit nanoseconds counter, with 0 being the 1901 epoch. Quota timers are a 34-bit unsigned second counter right shifted two bits, with 0 being the Unix epoch, and capped at the maximum inode timestamp value. This means that inode timestamps can range from: 0 (13 Dec 1901) through (2^64-1 / 1e9) (2 Jul 2486) Quota timers could theoretically range from: 0 (1 Jan 1970) through (((2^34-1) + (2^31-1)) & ~3) (16 Jun 2582). But with the capping in place, the quota timers maximum is: max((2^64-1 / 1e9) - (2^31-1), (((2^34-1) + (2^31-1)) & ~3) (2 Jul 2486). v2: rebase to 5.9, having landed the quota refactoring v3: various suggestions by Amir and Dave v4: drop the timestamp unions, add "is bigtime?" predicates everywhere v5: reintroduce timestamp unions as *legacy* timestamp unions v6: minor stylistic changes If you're going to start using this mess, you probably ought to just pull from my git trees, which are linked below. This is an extraordinary way to destroy everything. Enjoy! Comments and questions are, as always, welcome. --D kernel git tree: https://git.kernel.org/cgit/linux/kernel/git/djwong/xfs-linux.git/log/?h=bigtime xfsprogs git tree: https://git.kernel.org/cgit/linux/kernel/git/djwong/xfsprogs-dev.git/log/?h=bigtime fstests git tree: https://git.kernel.org/cgit/linux/kernel/git/djwong/xfstests-dev.git/log/?h=bigtime --- common/rc | 2 - common/xfs | 30 ++++++++++ tests/generic/721 | 117 +++++++++++++++++++++++++++++++++++++ tests/generic/721.out | 1 tests/generic/722 | 120 ++++++++++++++++++++++++++++++++++++++ tests/generic/722.out | 1 tests/generic/group | 2 + tests/xfs/122 | 1 tests/xfs/122.out | 1 tests/xfs/908 | 87 ++++++++++++++++++++++++++++ tests/xfs/908.out | 10 +++ tests/xfs/909 | 153 +++++++++++++++++++++++++++++++++++++++++++++++++ tests/xfs/909.out | 4 + tests/xfs/911 | 44 ++++++++++++++ tests/xfs/911.out | 15 +++++ tests/xfs/group | 3 + 16 files changed, 590 insertions(+), 1 deletion(-) create mode 100755 tests/generic/721 create mode 100644 tests/generic/721.out create mode 100755 tests/generic/722 create mode 100644 tests/generic/722.out create mode 100755 tests/xfs/908 create mode 100644 tests/xfs/908.out create mode 100755 tests/xfs/909 create mode 100644 tests/xfs/909.out create mode 100755 tests/xfs/911 create mode 100644 tests/xfs/911.out
