diff --git a/fs/xfs/libxfs/xfs_ag_resv.c b/fs/xfs/libxfs/xfs_ag_resv.c
index 2291f4224e24..0ca2e680034a 100644
--- a/fs/xfs/libxfs/xfs_ag_resv.c
+++ b/fs/xfs/libxfs/xfs_ag_resv.c
@@ -95,13 +95,13 @@ xfs_ag_resv_critical(
 
 	switch (type) {
 	case XFS_AG_RESV_METADATA:
-		avail = pag->pagf_freeblks - pag->pag_agfl_resv.ar_reserved;
+		avail = pag->pagf_freeblks - pag->pag_rmapbt_resv.ar_reserved;
 		orig = pag->pag_meta_resv.ar_asked;
 		break;
-	case XFS_AG_RESV_AGFL:
+	case XFS_AG_RESV_RMAPBT:
 		avail = pag->pagf_freeblks + pag->pagf_flcount -
 			pag->pag_meta_resv.ar_reserved;
-		orig = pag->pag_agfl_resv.ar_asked;
+		orig = pag->pag_rmapbt_resv.ar_asked;
 		break;
 	default:
 		ASSERT(0);
@@ -126,10 +126,10 @@ xfs_ag_resv_needed(
 {
 	xfs_extlen_t			len;
 
-	len = pag->pag_meta_resv.ar_reserved + pag->pag_agfl_resv.ar_reserved;
+	len = pag->pag_meta_resv.ar_reserved + pag->pag_rmapbt_resv.ar_reserved;
 	switch (type) {
 	case XFS_AG_RESV_METADATA:
-	case XFS_AG_RESV_AGFL:
+	case XFS_AG_RESV_RMAPBT:
 		len -= xfs_perag_resv(pag, type)->ar_reserved;
 		break;
 	case XFS_AG_RESV_NONE:
@@ -160,10 +160,11 @@ __xfs_ag_resv_free(
 	if (pag->pag_agno == 0)
 		pag->pag_mount->m_ag_max_usable += resv->ar_asked;
 	/*
-	 * AGFL blocks are always considered "free", so whatever
-	 * was reserved at mount time must be given back at umount.
+	 * RMAPBT blocks come from the AGFL and AGFL blocks are always
+	 * considered "free", so whatever was reserved at mount time must be
+	 * given back at umount.
 	 */
-	if (type == XFS_AG_RESV_AGFL)
+	if (type == XFS_AG_RESV_RMAPBT)
 		oldresv = resv->ar_orig_reserved;
 	else
 		oldresv = resv->ar_reserved;
@@ -185,7 +186,7 @@ xfs_ag_resv_free(
 	int				error;
 	int				err2;
 
-	error = __xfs_ag_resv_free(pag, XFS_AG_RESV_AGFL);
+	error = __xfs_ag_resv_free(pag, XFS_AG_RESV_RMAPBT);
 	err2 = __xfs_ag_resv_free(pag, XFS_AG_RESV_METADATA);
 	if (err2 && !error)
 		error = err2;
@@ -284,15 +285,15 @@ xfs_ag_resv_init(
 		}
 	}
 
-	/* Create the AGFL metadata reservation */
-	if (pag->pag_agfl_resv.ar_asked == 0) {
+	/* Create the RMAPBT metadata reservation */
+	if (pag->pag_rmapbt_resv.ar_asked == 0) {
 		ask = used = 0;
 
 		error = xfs_rmapbt_calc_reserves(mp, agno, &ask, &used);
 		if (error)
 			goto out;
 
-		error = __xfs_ag_resv_init(pag, XFS_AG_RESV_AGFL, ask, used);
+		error = __xfs_ag_resv_init(pag, XFS_AG_RESV_RMAPBT, ask, used);
 		if (error)
 			goto out;
 	}
@@ -304,7 +305,7 @@ xfs_ag_resv_init(
 		return error;
 
 	ASSERT(xfs_perag_resv(pag, XFS_AG_RESV_METADATA)->ar_reserved +
-	       xfs_perag_resv(pag, XFS_AG_RESV_AGFL)->ar_reserved <=
+	       xfs_perag_resv(pag, XFS_AG_RESV_RMAPBT)->ar_reserved <=
 	       pag->pagf_freeblks + pag->pagf_flcount);
 #endif
 out:
@@ -326,7 +327,7 @@ xfs_ag_resv_alloc_extent(
 
 	switch (type) {
 	case XFS_AG_RESV_METADATA:
-	case XFS_AG_RESV_AGFL:
+	case XFS_AG_RESV_RMAPBT:
 		resv = xfs_perag_resv(pag, type);
 		break;
 	default:
@@ -341,7 +342,7 @@ xfs_ag_resv_alloc_extent(
 
 	len = min_t(xfs_extlen_t, args->len, resv->ar_reserved);
 	resv->ar_reserved -= len;
-	if (type == XFS_AG_RESV_AGFL)
+	if (type == XFS_AG_RESV_RMAPBT)
 		return;
 	/* Allocations of reserved blocks only need on-disk sb updates... */
 	xfs_trans_mod_sb(args->tp, XFS_TRANS_SB_RES_FDBLOCKS, -(int64_t)len);
@@ -366,7 +367,7 @@ xfs_ag_resv_free_extent(
 
 	switch (type) {
 	case XFS_AG_RESV_METADATA:
-	case XFS_AG_RESV_AGFL:
+	case XFS_AG_RESV_RMAPBT:
 		resv = xfs_perag_resv(pag, type);
 		break;
 	default:
@@ -379,7 +380,7 @@ xfs_ag_resv_free_extent(
 
 	leftover = min_t(xfs_extlen_t, len, resv->ar_asked - resv->ar_reserved);
 	resv->ar_reserved += leftover;
-	if (type == XFS_AG_RESV_AGFL)
+	if (type == XFS_AG_RESV_RMAPBT)
 		return;
 	/* Freeing into the reserved pool only requires on-disk update... */
 	xfs_trans_mod_sb(tp, XFS_TRANS_SB_RES_FDBLOCKS, len);
diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c
index 36101e55ed07..1dc244d15a75 100644
--- a/fs/xfs/libxfs/xfs_alloc.c
+++ b/fs/xfs/libxfs/xfs_alloc.c
@@ -728,7 +728,7 @@ xfs_alloc_ag_vextent(
 
 	ASSERT(args->len >= args->minlen);
 	ASSERT(args->len <= args->maxlen);
-	ASSERT(!args->wasfromfl || args->resv != XFS_AG_RESV_AGFL);
+	ASSERT(!args->wasfromfl || args->resv != XFS_AG_RESV_RMAPBT);
 	ASSERT(args->agbno % args->alignment == 0);
 
 	/* if not file data, insert new block into the reverse map btree */
@@ -1600,7 +1600,7 @@ xfs_alloc_ag_vextent_small(
 	 * freelist.
 	 */
 	else if (args->minlen == 1 && args->alignment == 1 &&
-		 args->resv != XFS_AG_RESV_AGFL &&
+		 args->resv != XFS_AG_RESV_RMAPBT &&
 		 (be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_flcount)
 		  > args->minleft)) {
 		error = xfs_alloc_get_freelist(args->tp, args->agbp, &fbno, 0);
@@ -1634,7 +1634,7 @@ xfs_alloc_ag_vextent_small(
 			 * If we're feeding an AGFL block to something that
 			 * doesn't live in the free space, we need to clear
 			 * out the OWN_AG rmap and add the block back to
-			 * the AGFL per-AG reservation.
+			 * the RMAPBT per-AG reservation.
 			 */
 			xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_AG);
 			error = xfs_rmap_free(args->tp, args->agbp, args->agno,
@@ -1642,7 +1642,7 @@ xfs_alloc_ag_vextent_small(
 			if (error)
 				goto error0;
 			pag = xfs_perag_get(args->mp, args->agno);
-			xfs_ag_resv_free_extent(pag, XFS_AG_RESV_AGFL,
+			xfs_ag_resv_free_extent(pag, XFS_AG_RESV_RMAPBT,
 					args->tp, 1);
 			xfs_perag_put(pag);
 
@@ -1928,14 +1928,12 @@ xfs_free_ag_extent(
 	XFS_STATS_INC(mp, xs_freex);
 	XFS_STATS_ADD(mp, xs_freeb, len);
 
-	trace_xfs_free_extent(mp, agno, bno, len, type == XFS_AG_RESV_AGFL,
-			haveleft, haveright);
+	trace_xfs_free_extent(mp, agno, bno, len, type, haveleft, haveright);
 
 	return 0;
 
  error0:
-	trace_xfs_free_extent(mp, agno, bno, len, type == XFS_AG_RESV_AGFL,
-			-1, -1);
+	trace_xfs_free_extent(mp, agno, bno, len, type, -1, -1);
 	if (bno_cur)
 		xfs_btree_del_cursor(bno_cur, XFS_BTREE_ERROR);
 	if (cnt_cur)
@@ -2172,7 +2170,7 @@ xfs_alloc_fix_freelist(
 		if (error)
 			goto out_agbp_relse;
 		error = xfs_free_ag_extent(tp, agbp, args->agno, bno, 1,
-					   &targs.oinfo, XFS_AG_RESV_AGFL);
+					   &targs.oinfo, XFS_AG_RESV_RMAPBT);
 		if (error)
 			goto out_agbp_relse;
 		bp = xfs_btree_get_bufs(mp, tp, args->agno, bno, 0);
@@ -2198,7 +2196,7 @@ xfs_alloc_fix_freelist(
 	while (pag->pagf_flcount < need) {
 		targs.agbno = 0;
 		targs.maxlen = need - pag->pagf_flcount;
-		targs.resv = XFS_AG_RESV_AGFL;
+		targs.resv = XFS_AG_RESV_RMAPBT;
 
 		/* Allocate as many blocks as possible at once. */
 		error = xfs_alloc_ag_vextent(&targs);
@@ -2879,7 +2877,7 @@ xfs_free_extent(
 	int			error;
 
 	ASSERT(len != 0);
-	ASSERT(type != XFS_AG_RESV_AGFL);
+	ASSERT(type != XFS_AG_RESV_RMAPBT);
 
 	if (XFS_TEST_ERROR(false, mp,
 			XFS_ERRTAG_FREE_EXTENT))
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 44a63c5f43c8..a2cf3718bea9 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -326,7 +326,7 @@ xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
 enum xfs_ag_resv_type {
 	XFS_AG_RESV_NONE = 0,
 	XFS_AG_RESV_METADATA,
-	XFS_AG_RESV_AGFL,
+	XFS_AG_RESV_RMAPBT,
 };
 
 struct xfs_ag_resv {
@@ -390,8 +390,8 @@ typedef struct xfs_perag {
 
 	/* Blocks reserved for all kinds of metadata. */
 	struct xfs_ag_resv	pag_meta_resv;
-	/* Blocks reserved for just AGFL-based metadata. */
-	struct xfs_ag_resv	pag_agfl_resv;
+	/* Blocks reserved for the reverse mapping btree. */
+	struct xfs_ag_resv	pag_rmapbt_resv;
 
 	/* reference count */
 	uint8_t			pagf_refcount_level;
@@ -405,8 +405,8 @@ xfs_perag_resv(
 	switch (type) {
 	case XFS_AG_RESV_METADATA:
 		return &pag->pag_meta_resv;
-	case XFS_AG_RESV_AGFL:
-		return &pag->pag_agfl_resv;
+	case XFS_AG_RESV_RMAPBT:
+		return &pag->pag_rmapbt_resv;
 	default:
 		return NULL;
 	}
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 8c16177b33d4..d81c4f868d69 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -1061,7 +1061,7 @@ xfs_reflink_ag_has_free_space(
 		return 0;
 
 	pag = xfs_perag_get(mp, agno);
-	if (xfs_ag_resv_critical(pag, XFS_AG_RESV_AGFL) ||
+	if (xfs_ag_resv_critical(pag, XFS_AG_RESV_RMAPBT) ||
 	    xfs_ag_resv_critical(pag, XFS_AG_RESV_METADATA))
 		error = -ENOSPC;
 	xfs_perag_put(pag);