[PATCH 37/37] xfs: enable realtime rmap btree

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

From: Darrick J. Wong <djwong@xxxxxxxxxx>

Permit mounting filesystems with realtime rmap btrees.

Signed-off-by: "Darrick J. Wong" <djwong@xxxxxxxxxx>
---
 fs/xfs/xfs_rtalloc.c |   12 ++++++++----
 fs/xfs/xfs_super.c   |    6 ------
 2 files changed, 8 insertions(+), 10 deletions(-)


diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index 3c1bce5a4855f2..a69967f9d88ead 100644
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -1282,11 +1282,15 @@ xfs_growfs_rt(
 	    XFS_FSB_TO_B(mp, in->extsize) < XFS_MIN_RTEXTSIZE)
 		goto out_unlock;
 
-	/* Unsupported realtime features. */
+	/* Check for features supported only on rtgroups filesystems. */
 	error = -EOPNOTSUPP;
-	if (xfs_has_quota(mp) && !xfs_has_rtgroups(mp))
-		goto out_unlock;
-	if (xfs_has_rmapbt(mp) || xfs_has_reflink(mp))
+	if (!xfs_has_rtgroups(mp)) {
+		if (xfs_has_rmapbt(mp))
+			goto out_unlock;
+		if (xfs_has_quota(mp))
+			goto out_unlock;
+	}
+	if (xfs_has_reflink(mp))
 		goto out_unlock;
 
 	error = xfs_sb_validate_fsb_count(&mp->m_sb, in->newblocks);
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 394fdf3bb53531..ecd5a9f444d862 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1767,12 +1767,6 @@ xfs_fs_fill_super(
 		}
 	}
 
-	if (xfs_has_rmapbt(mp) && mp->m_sb.sb_rblocks) {
-		xfs_alert(mp,
-	"reverse mapping btree not compatible with realtime device!");
-		error = -EINVAL;
-		goto out_filestream_unmount;
-	}
 
 	if (xfs_has_exchange_range(mp))
 		xfs_warn_experimental(mp, XFS_EXPERIMENTAL_EXCHRANGE);