[16/18] xfs_db: add bigtime upgrade path

Commit Message

Darrick J. Wong Aug. 17, 2020, 11 p.m. UTC

From: Darrick J. Wong <[e-mail]>

Enable users to upgrade their filesystems to bigtime support.

Signed-off-by: Darrick J. Wong <[e-mail]>
---
 db/sb.c              |   13 +++++++++++++
 man/man8/xfs_admin.8 |    5 +++++
 2 files changed, 18 insertions(+)

Comments

Amir Goldstein Aug. 18, 2020, 3:17 p.m. UTC | #1

On Tue, Aug 18, 2020 at 2:23 AM Darrick J. Wong <[e-mail]> wrote:
>
> From: Darrick J. Wong <[e-mail]>
>
> Enable users to upgrade their filesystems to bigtime support.
>
> Signed-off-by: Darrick J. Wong <[e-mail]>

Nice!
I am going to pass on the review of the other two xfs_db patches.
Too much new code to read...

Reviewed-by: Amir Goldstein <[e-mail]>

Patch

diff --git a/db/sb.c b/db/sb.c
index c68bb9a958e7..4fb66dade2c2 100644
--- a/db/sb.c
+++ b/db/sb.c
@@ -778,6 +778,19 @@  version_f(
 			}
 
 			upgrade_ro_compat |= XFS_SB_FEAT_RO_COMPAT_INOBTCNT;
+		} else if (!strcasecmp(argv[1], "bigtime")) {
+			if (xfs_sb_version_hasbigtime(&mp->m_sb)) {
+				dbprintf(
+		_("bigtime feature is already enabled\n"));
+				return 0;
+			}
+			if (!xfs_sb_version_hascrc(&mp->m_sb)) {
+				dbprintf(
+		_("bigtime feature cannot be enabled on pre-V5 filesystems\n"));
+				return 0;
+			}
+
+			upgrade_incompat |= XFS_SB_FEAT_INCOMPAT_BIGTIME;
 		} else if (!strcasecmp(argv[1], "extflg")) {
 			switch (XFS_SB_VERSION_NUM(&mp->m_sb)) {
 			case XFS_SB_VERSION_1:
diff --git a/man/man8/xfs_admin.8 b/man/man8/xfs_admin.8
index 65ca6afc1e12..c09fe62b6827 100644
--- a/man/man8/xfs_admin.8
+++ b/man/man8/xfs_admin.8
@@ -117,6 +117,11 @@  This reduces mount time by caching the size of the inode btrees in the
 allocation group metadata.
 Once enabled, the filesystem will not be writable by older kernels.
 The filesystem cannot be downgraded after this feature is enabled.
+.TP
+.B bigtime
+Upgrade the filesystem to support larger timestamps up to the year 2486.
+Once enabled, the filesystem will not be readable by older kernels.
+The filesystem cannot be downgraded.
 .RE
 .TP
 .BI \-U " uuid"