[PATCH 25/26] mkfs: format bigtime filesystems

Darrick J. Wong
2020-10-26T23:36:52Z

From: Darrick J. Wong <darrick.wong@oracle.com>

Allow formatting with large timestamps.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
man/man8/mkfs.xfs.8 | 16 ++++++++++++++++
mkfs/xfs_mkfs.c | 24 +++++++++++++++++++++++-
2 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/man/man8/mkfs.xfs.8 b/man/man8/mkfs.xfs.8
index 1a6a5f93f0ea..9e72a841f868 100644
--- a/man/man8/mkfs.xfs.8
+++ b/man/man8/mkfs.xfs.8
@@ -150,6 +150,22 @@ valid
are:
.RS 1.2i
.TP
+.BI bigtime= value
+This option enables filesystems that can handle inode timestamps from December
+1901 to July 2486, and quota timer expirations from January 1970 to July 2486.
+The value is either 0 to disable the feature, or 1 to enable large timestamps.
+.IP
+If this feature is not enabled, the filesystem can only handle timestamps from
+December 1901 to January 2038, and quota timers from January 1970 to February
+2106.
+.IP
+By default,
+.B mkfs.xfs
+will not enable this feature.
+If the option
+.B \-m crc=0
+is used, the large timestamp feature is not supported and is disabled.
+.TP
.BI crc= value
This is used to create a filesystem which maintains and checks CRC information
in all metadata objects on disk. The value is either 0 to disable the feature,
diff --git a/mkfs/xfs_mkfs.c b/mkfs/xfs_mkfs.c
index 23e3077e0174..4cb79b695921 100644
--- a/mkfs/xfs_mkfs.c
+++ b/mkfs/xfs_mkfs.c
@@ -120,6 +120,7 @@ enum {
M_RMAPBT,
M_REFLINK,
M_INOBTCNT,
+ M_BIGTIME,
M_MAX_OPTS,
};

@@ -662,6 +663,7 @@ static struct opt_params mopts = {
[M_RMAPBT] = "rmapbt",
[M_REFLINK] = "reflink",
[M_INOBTCNT] = "inobtcount",
+ [M_BIGTIME] = "bigtime",
},
.subopt_params = {
{ .index = M_CRC,
@@ -698,6 +700,12 @@ static struct opt_params mopts = {
.maxval = 1,
.defaultval = 1,
},
+ { .index = M_BIGTIME,
+ .conflicts = { { NULL, LAST_CONFLICT } },
+ .minval = 0,
+ .maxval = 1,
+ .defaultval = 1,
+ },
},
};

@@ -749,6 +757,7 @@ struct sb_feat_args {
bool rmapbt; /* XFS_SB_FEAT_RO_COMPAT_RMAPBT */
bool reflink; /* XFS_SB_FEAT_RO_COMPAT_REFLINK */
bool inobtcnt; /* XFS_SB_FEAT_RO_COMPAT_INOBTCNT */
+ bool bigtime; /* XFS_SB_FEAT_INCOMPAT_BIGTIME */
bool nodalign;
bool nortalign;
};
@@ -872,7 +881,7 @@ usage( void )
fprintf(stderr, _("Usage: %s\n\
/* blocksize */ [-b size=num]\n\
/* metadata */ [-m crc=0|1,finobt=0|1,uuid=xxx,rmapbt=0|1,reflink=0|1,\n\
- inobtcnt=0|1]\n\
+ inobtcnt=0|1,bigtime=0|1]\n\
/* data subvol */ [-d agcount=n,agsize=n,file,name=xxx,size=num,\n\
(sunit=value,swidth=value|su=num,sw=num|noalign),\n\
sectsize=num\n\
@@ -1578,6 +1587,9 @@ meta_opts_parser(
case M_INOBTCNT:
cli->sb_feat.inobtcnt = getnum(value, opts, subopt);
break;
+ case M_BIGTIME:
+ cli->sb_feat.bigtime = getnum(value, opts, subopt);
+ break;
default:
return -EINVAL;
}
@@ -2008,6 +2020,13 @@ _("inode btree counters not supported without CRC support\n"));
usage();
}
cli->sb_feat.inobtcnt = false;
+
+ if (cli->sb_feat.bigtime && cli_opt_set(&mopts, M_BIGTIME)) {
+ fprintf(stderr,
+_("timestamps later than 2038 not supported without CRC support\n"));
+ usage();
+ }
+ cli->sb_feat.bigtime = false;
}

if (!cli->sb_feat.finobt) {
@@ -2986,6 +3005,8 @@ sb_set_features(
sbp->sb_features_ro_compat |= XFS_SB_FEAT_RO_COMPAT_REFLINK;
if (fp->inobtcnt)
sbp->sb_features_ro_compat |= XFS_SB_FEAT_RO_COMPAT_INOBTCNT;
+ if (fp->bigtime)
+ sbp->sb_features_incompat |= XFS_SB_FEAT_INCOMPAT_BIGTIME;

/*
* Sparse inode chunk support has two main inode alignment requirements.
@@ -3652,6 +3673,7 @@ main(
.parent_pointers = false,
.nodalign = false,
.nortalign = false,
+ .bigtime = false,
},
};