[PATCH 32/32] mkfs: enable formatting with parent pointers

["Darrick J. Wong" <djwong@xxxxxxxxxx>]

From: Allison Henderson <allison.henderson@xxxxxxxxxx>

Enable parent pointer support in mkfs via the '-n parent' parameter.

Signed-off-by: Allison Henderson <allison.henderson@xxxxxxxxxx>
Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
 mkfs/xfs_mkfs.c |   29 ++++++++++++++++++++++++++---
 1 file changed, 26 insertions(+), 3 deletions(-)


diff --git a/mkfs/xfs_mkfs.c b/mkfs/xfs_mkfs.c
index f2e683117..c86f2bedf 100644
--- a/mkfs/xfs_mkfs.c
+++ b/mkfs/xfs_mkfs.c
@@ -110,6 +110,7 @@ enum {
 	N_SIZE = 0,
 	N_VERSION,
 	N_FTYPE,
+	N_PARENT,
 	N_MAX_OPTS,
 };
 
@@ -621,6 +622,7 @@ static struct opt_params nopts = {
 		[N_SIZE] = "size",
 		[N_VERSION] = "version",
 		[N_FTYPE] = "ftype",
+		[N_PARENT] = "parent",
 		[N_MAX_OPTS] = NULL,
 	},
 	.subopt_params = {
@@ -644,6 +646,14 @@ static struct opt_params nopts = {
 		  .maxval = 1,
 		  .defaultval = 1,
 		},
+		{ .index = N_PARENT,
+		  .conflicts = { { NULL, LAST_CONFLICT } },
+		  .minval = 0,
+		  .maxval = 1,
+		  .defaultval = 1,
+		},
+
+
 	},
 };
 
@@ -1000,7 +1010,7 @@ usage( void )
 /* log subvol */	[-l agnum=n,internal,size=num,logdev=xxx,version=n\n\
 			    sunit=value|su=num,sectsize=num,lazy-count=0|1]\n\
 /* label */		[-L label (maximum 12 characters)]\n\
-/* naming */		[-n size=num,version=2|ci,ftype=0|1]\n\
+/* naming */		[-n size=num,version=2|ci,ftype=0|1,parent=0|1]]\n\
 /* no-op info only */	[-N]\n\
 /* prototype file */	[-p fname]\n\
 /* quiet */		[-q]\n\
@@ -1774,6 +1784,9 @@ naming_opts_parser(
 	case N_FTYPE:
 		cli->sb_feat.dirftype = getnum(value, opts, subopt);
 		break;
+	case N_PARENT:
+		cli->sb_feat.parent_pointers = getnum(value, &nopts, N_PARENT);
+		break;
 	default:
 		return -EINVAL;
 	}
@@ -2286,6 +2299,14 @@ _("inode btree counters not supported without finobt support\n"));
 		cli->sb_feat.inobtcnt = false;
 	}
 
+	if ((cli->sb_feat.parent_pointers) &&
+	    cli->sb_feat.dir_version == 4) {
+		fprintf(stderr,
+_("parent pointers not supported on v4 filesystems\n"));
+		usage();
+		cli->sb_feat.parent_pointers = false;
+	}
+
 	if (cli->xi->rtname) {
 		if (cli->sb_feat.reflink && cli_opt_set(&mopts, M_REFLINK)) {
 			fprintf(stderr,
@@ -3285,8 +3306,6 @@ sb_set_features(
 		sbp->sb_features2 |= XFS_SB_VERSION2_LAZYSBCOUNTBIT;
 	if (fp->projid32bit)
 		sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT;
-	if (fp->parent_pointers)
-		sbp->sb_features2 |= XFS_SB_VERSION2_PARENTBIT;
 	if (fp->crcs_enabled)
 		sbp->sb_features2 |= XFS_SB_VERSION2_CRCBIT;
 	if (fp->attr_version == 2)
@@ -3327,6 +3346,10 @@ sb_set_features(
 		sbp->sb_features_ro_compat |= XFS_SB_FEAT_RO_COMPAT_INOBTCNT;
 	if (fp->bigtime)
 		sbp->sb_features_incompat |= XFS_SB_FEAT_INCOMPAT_BIGTIME;
+	if (fp->parent_pointers) {
+		sbp->sb_features_incompat |= XFS_SB_FEAT_INCOMPAT_PARENT;
+		sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
+	}
 
 	/*
 	 * Sparse inode chunk support has two main inode alignment requirements.