[PATCH 18/22] xfs: store rtgroup information with a bmap intent

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

From: Darrick J. Wong <djwong@xxxxxxxxxx>

Make the bmap intent items take an active reference to the rtgroup
containing the space that is being mapped or unmapped.  We will need
this functionality once we start enabling rmap and reflink on the rt
volume.

Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
 fs/xfs/libxfs/xfs_bmap.h |    5 ++++-
 fs/xfs/xfs_bmap_item.c   |   18 ++++++++++++++++--
 2 files changed, 20 insertions(+), 3 deletions(-)


diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h
index d870c6a62e40..05097b1d5c7d 100644
--- a/fs/xfs/libxfs/xfs_bmap.h
+++ b/fs/xfs/libxfs/xfs_bmap.h
@@ -241,7 +241,10 @@ struct xfs_bmap_intent {
 	enum xfs_bmap_intent_type		bi_type;
 	int					bi_whichfork;
 	struct xfs_inode			*bi_owner;
-	struct xfs_perag			*bi_pag;
+	union {
+		struct xfs_perag		*bi_pag;
+		struct xfs_rtgroup		*bi_rtg;
+	};
 	struct xfs_bmbt_irec			bi_bmap;
 };
 
diff --git a/fs/xfs/xfs_bmap_item.c b/fs/xfs/xfs_bmap_item.c
index bf52d30d7d1c..04eeae9aef79 100644
--- a/fs/xfs/xfs_bmap_item.c
+++ b/fs/xfs/xfs_bmap_item.c
@@ -25,6 +25,7 @@
 #include "xfs_log_priv.h"
 #include "xfs_log_recover.h"
 #include "xfs_ag.h"
+#include "xfs_rtgroup.h"
 
 struct kmem_cache	*xfs_bui_cache;
 struct kmem_cache	*xfs_bud_cache;
@@ -362,8 +363,18 @@ xfs_bmap_update_get_group(
 {
 	xfs_agnumber_t		agno;
 
-	if (xfs_ifork_is_realtime(bi->bi_owner, bi->bi_whichfork))
+	if (xfs_ifork_is_realtime(bi->bi_owner, bi->bi_whichfork)) {
+		if (xfs_has_rtgroups(mp)) {
+			xfs_rgnumber_t	rgno;
+
+			rgno = xfs_rtb_to_rgno(mp, bi->bi_bmap.br_startblock);
+			bi->bi_rtg = xfs_rtgroup_get(mp, rgno);
+		} else {
+			bi->bi_rtg = NULL;
+		}
+
 		return;
+	}
 
 	agno = XFS_FSB_TO_AGNO(mp, bi->bi_bmap.br_startblock);
 	bi->bi_pag = xfs_perag_get(mp, agno);
@@ -383,8 +394,11 @@ static inline void
 xfs_bmap_update_put_group(
 	struct xfs_bmap_intent	*bi)
 {
-	if (xfs_ifork_is_realtime(bi->bi_owner, bi->bi_whichfork))
+	if (xfs_ifork_is_realtime(bi->bi_owner, bi->bi_whichfork)) {
+		if (xfs_has_rtgroups(bi->bi_owner->i_mount))
+			xfs_rtgroup_put(bi->bi_rtg);
 		return;
+	}
 
 	xfs_perag_drop_intents(bi->bi_pag);
 	xfs_perag_put(bi->bi_pag);