From e9601810beb7d5b36a5fbd03c593cf63f685bfff Mon Sep 17 00:00:00 2001

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

Date: Fri, 20 Nov 2020 17:03:28 -0500

Subject: [PATCH] mkfs: format bigtime filesystems

Allow formatting with large timestamps.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

Reviewed-by: Christoph Hellwig <hch@lst.de>

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>

---

diff --git a/man/man8/mkfs.xfs.8 b/man/man8/mkfs.xfs.8

index 45b150f..0a115cb 100644

--- a/man/man8/mkfs.xfs.8

+++ b/man/man8/mkfs.xfs.8

@@ -154,6 +154,22 @@ 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 87f15f4..b74a00b 100644

--- a/mkfs/xfs_mkfs.c

+++ b/mkfs/xfs_mkfs.c

@@ -118,6 +118,7 @@ enum {

 	M_RMAPBT,

 	M_REFLINK,

 	M_INOBTCNT,

+	M_BIGTIME,

 	M_MAX_OPTS,

 };

@@ -653,6 +654,7 @@ static struct opt_params mopts = {

 		[M_RMAPBT] = "rmapbt",

 		[M_REFLINK] = "reflink",

 		[M_INOBTCNT] = "inobtcount",

+		[M_BIGTIME] = "bigtime",

 	},

 	.subopt_params = {

 		{ .index = M_CRC,

@@ -689,6 +691,12 @@ static struct opt_params mopts = {

 		  .maxval = 1,

 		  .defaultval = 1,

 		},

+		{ .index = M_BIGTIME,

+		  .conflicts = { { NULL, LAST_CONFLICT } },

+		  .minval = 0,

+		  .maxval = 1,

+		  .defaultval = 1,

+		},

 	},

 };

@@ -740,6 +748,7 @@ 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;

 };

@@ -863,7 +872,7 @@ 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\

@@ -1620,6 +1629,9 @@ 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;

 	}

@@ -2057,6 +2069,13 @@ _("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) {

@@ -3033,6 +3052,8 @@ 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.

@@ -3952,6 +3973,7 @@ main(

 			.parent_pointers = false,

 			.nodalign = false,

 			.nortalign = false,

+			.bigtime = false,

 		},

 	};