1 files changed, 116 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_zones.c b/fs/xfs/libxfs/xfs_zones.c
new file mode 100644
index 000000000000..24e350c31933
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_zones.c
@@ -0,0 +1,116 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023-2025 Christoph Hellwig.
+ * Copyright (c) 2024-2025, Western Digital Corporation or its affiliates.
+ */
+#include "xfs_platform.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_inode.h"
+#include "xfs_rtgroup.h"
+#include "xfs_zones.h"
+
+static bool
+xfs_validate_blk_zone_seq(
+	struct xfs_mount	*mp,
+	struct blk_zone		*zone,
+	unsigned int		zone_no,
+	xfs_rgblock_t		*write_pointer)
+{
+	switch (zone->cond) {
+	case BLK_ZONE_COND_EMPTY:
+		*write_pointer = 0;
+		return true;
+	case BLK_ZONE_COND_IMP_OPEN:
+	case BLK_ZONE_COND_EXP_OPEN:
+	case BLK_ZONE_COND_CLOSED:
+	case BLK_ZONE_COND_ACTIVE:
+		if (zone->wp < zone->start ||
+		    zone->wp >= zone->start + zone->capacity) {
+			xfs_warn(mp,
+	"zone %u write pointer (%llu) outside of zone.",
+				zone_no, zone->wp);
+			return false;
+		}
+
+		*write_pointer = XFS_BB_TO_FSB(mp, zone->wp - zone->start);
+		return true;
+	case BLK_ZONE_COND_FULL:
+		*write_pointer = XFS_BB_TO_FSB(mp, zone->capacity);
+		return true;
+	case BLK_ZONE_COND_NOT_WP:
+	case BLK_ZONE_COND_OFFLINE:
+	case BLK_ZONE_COND_READONLY:
+		xfs_warn(mp, "zone %u has unsupported zone condition 0x%x.",
+			zone_no, zone->cond);
+		return false;
+	default:
+		xfs_warn(mp, "zone %u has unknown zone condition 0x%x.",
+			zone_no, zone->cond);
+		return false;
+	}
+}
+
+static bool
+xfs_validate_blk_zone_conv(
+	struct xfs_mount	*mp,
+	struct blk_zone		*zone,
+	unsigned int		zone_no)
+{
+	switch (zone->cond) {
+	case BLK_ZONE_COND_NOT_WP:
+		return true;
+	default:
+		xfs_warn(mp,
+"conventional zone %u has unsupported zone condition 0x%x.",
+			 zone_no, zone->cond);
+		return false;
+	}
+}
+
+bool
+xfs_validate_blk_zone(
+	struct xfs_mount	*mp,
+	struct blk_zone		*zone,
+	unsigned int		zone_no,
+	uint32_t		expected_size,
+	uint32_t		expected_capacity,
+	xfs_rgblock_t		*write_pointer)
+{
+	/*
+	 * Check that the zone capacity matches the rtgroup size stored in the
+	 * superblock.  Note that all zones including the last one must have a
+	 * uniform capacity.
+	 */
+	if (XFS_BB_TO_FSB(mp, zone->capacity) != expected_capacity) {
+		xfs_warn(mp,
+"zone %u capacity (%llu) does not match RT group size (%u).",
+			zone_no, XFS_BB_TO_FSB(mp, zone->capacity),
+			expected_capacity);
+		return false;
+	}
+
+	if (XFS_BB_TO_FSB(mp, zone->len) != expected_size) {
+		xfs_warn(mp,
+"zone %u length (%llu) does not match geometry (%u).",
+			zone_no, XFS_BB_TO_FSB(mp, zone->len),
+			expected_size);
+		return false;
+	}
+
+	switch (zone->type) {
+	case BLK_ZONE_TYPE_CONVENTIONAL:
+		return xfs_validate_blk_zone_conv(mp, zone, zone_no);
+	case BLK_ZONE_TYPE_SEQWRITE_REQ:
+		return xfs_validate_blk_zone_seq(mp, zone, zone_no,
+				write_pointer);
+	default:
+		xfs_warn(mp, "zoned %u has unsupported type 0x%x.",
+			zone_no, zone->type);
+		return false;
+	}
+}