xfs: rename agfl perag res type to rmapbt

The AGFL perag reservation type accounts all allocations that feed
into (or are released from) the allocation group free list (agfl).
The purpose of the reservation is to support worst case conditions
for the reverse mapping btree (rmapbt). As such, the agfl
reservation usage accounting only considers rmapbt usage when the
in-core counters are initialized at mount time.

This implementation inconsistency leads to divergence of the in-core
and on-disk usage accounting over time. In preparation to resolve
this inconsistency and adjust the AGFL reservation into an rmapbt
specific reservation, rename the AGFL reservation type and
associated accounting fields to something more rmapbt-specific. Also
fix up a couple tracepoints that incorrectly use the AGFL
reservation type to pass the agfl state of the associated extent
where the raw reservation type is expected.

Note that this patch does not change perag reservation behavior.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

1 files changed, 9 insertions, 11 deletions

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))