xfs_repair: Add support for upgrading to large extent counters

This commit adds support to xfs_repair to allow upgrading an existing
filesystem to support per-inode large extent counters.

Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandan.babu@oracle.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>

5 files changed, 44 insertions, 0 deletions

diff --git a/man/man8/xfs_admin.8 b/man/man8/xfs_admin.8
index ad28e0f68c..4794d6774e 100644
--- a/man/man8/xfs_admin.8
+++ b/man/man8/xfs_admin.8
@@ -149,6 +149,13 @@ Upgrade a filesystem to support larger timestamps up to the year 2486.
 The filesystem cannot be downgraded after this feature is enabled.
 Once enabled, the filesystem will not be mountable by older kernels.
 This feature was added to Linux 5.10.
+.TP 0.4i
+.B nrext64
+Upgrade a filesystem to support large per-inode extent counters. The maximum
+data fork extent count will be 2^48 - 1, while the maximum attribute fork
+extent count will be 2^32 - 1. The filesystem cannot be downgraded after this
+feature is enabled. Once enabled, the filesystem will not be mountable by
+older kernels.  This feature was added to Linux 5.19.
 .RE
 .TP
 .BI \-U " uuid"
diff --git a/repair/globals.c b/repair/globals.c
index f8d4f1e401..c40849853b 100644
--- a/repair/globals.c
+++ b/repair/globals.c
@@ -51,6 +51,7 @@ int	lazy_count;		/* What to set if to if converting */
 bool	features_changed;	/* did we change superblock feature bits? */
 bool	add_inobtcount;		/* add inode btree counts to AGI */
 bool	add_bigtime;		/* add support for timestamps up to 2486 */
+bool	add_nrext64;
 
 /* misc status variables */
 
diff --git a/repair/globals.h b/repair/globals.h
index 0f98bd2b58..b65e4a2d09 100644
--- a/repair/globals.h
+++ b/repair/globals.h
@@ -92,6 +92,7 @@ extern int	lazy_count;		/* What to set if to if converting */
 extern bool	features_changed;	/* did we change superblock feature bits? */
 extern bool	add_inobtcount;		/* add inode btree counts to AGI */
 extern bool	add_bigtime;		/* add support for timestamps up to 2486 */
+extern bool	add_nrext64;
 
 /* misc status variables */
 
diff --git a/repair/phase2.c b/repair/phase2.c
index 703656203e..56a39bb456 100644
--- a/repair/phase2.c
+++ b/repair/phase2.c
@@ -181,6 +181,28 @@ set_bigtime(
 	return true;
 }
 
+static bool
+set_nrext64(
+	struct xfs_mount	*mp,
+	struct xfs_sb		*new_sb)
+{
+	if (!xfs_has_crc(mp)) {
+		printf(
+	_("Nrext64 only supported on V5 filesystems.\n"));
+		exit(0);
+	}
+
+	if (xfs_has_large_extent_counts(mp)) {
+		printf(_("Filesystem already supports nrext64.\n"));
+		exit(0);
+	}
+
+	printf(_("Adding nrext64 to filesystem.\n"));
+	new_sb->sb_features_incompat |= XFS_SB_FEAT_INCOMPAT_NREXT64;
+	new_sb->sb_features_incompat |= XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR;
+	return true;
+}
+
 struct check_state {
 	struct xfs_sb		sb;
 	uint64_t		features;
@@ -287,6 +309,8 @@ upgrade_filesystem(
 		dirty |= set_inobtcount(mp, &new_sb);
 	if (add_bigtime)
 		dirty |= set_bigtime(mp, &new_sb);
+	if (add_nrext64)
+		dirty |= set_nrext64(mp, &new_sb);
 	if (!dirty)
 		return;
 
diff --git a/repair/xfs_repair.c b/repair/xfs_repair.c
index d08b0cecbc..c94671d8d1 100644
--- a/repair/xfs_repair.c
+++ b/repair/xfs_repair.c
@@ -67,6 +67,7 @@ enum c_opt_nums {
 	CONVERT_LAZY_COUNT = 0,
 	CONVERT_INOBTCOUNT,
 	CONVERT_BIGTIME,
+	CONVERT_NREXT64,
 	C_MAX_OPTS,
 };
 
@@ -74,6 +75,7 @@ static char *c_opts[] = {
 	[CONVERT_LAZY_COUNT]	= "lazycount",
 	[CONVERT_INOBTCOUNT]	= "inobtcount",
 	[CONVERT_BIGTIME]	= "bigtime",
+	[CONVERT_NREXT64]	= "nrext64",
 	[C_MAX_OPTS]		= NULL,
 };
 
@@ -324,6 +326,15 @@ process_args(int argc, char **argv)
 		_("-c bigtime only supports upgrades\n"));
 					add_bigtime = true;
 					break;
+				case CONVERT_NREXT64:
+					if (!val)
+						do_abort(
+		_("-c nrext64 requires a parameter\n"));
+					if (strtol(val, NULL, 0) != 1)
+						do_abort(
+		_("-c nrext64 only supports upgrades\n"));
+					add_nrext64 = true;
+					break;
 				default:
 					unknown('c', val);
 					break;