Merge branch 'next' into for-linus

Prepare input updates for 6.3 merge window.

1 files changed, 54 insertions, 6 deletions

diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index 292d5e54a92c..16534e9873f6 100644
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -1311,10 +1311,10 @@ xfs_rtalloc_reinit_frextents(
 	uint64_t		val = 0;
 	int			error;
 
-	xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL);
+	xfs_ilock(mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
 	error = xfs_rtalloc_query_all(mp, NULL, xfs_rtalloc_count_frextent,
 			&val);
-	xfs_iunlock(mp->m_rbmip, XFS_ILOCK_EXCL);
+	xfs_iunlock(mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
 	if (error)
 		return error;
 
@@ -1326,6 +1326,41 @@ xfs_rtalloc_reinit_frextents(
 }
 
 /*
+ * Read in the bmbt of an rt metadata inode so that we never have to load them
+ * at runtime.  This enables the use of shared ILOCKs for rtbitmap scans.  Use
+ * an empty transaction to avoid deadlocking on loops in the bmbt.
+ */
+static inline int
+xfs_rtmount_iread_extents(
+	struct xfs_inode	*ip,
+	unsigned int		lock_class)
+{
+	struct xfs_trans	*tp;
+	int			error;
+
+	error = xfs_trans_alloc_empty(ip->i_mount, &tp);
+	if (error)
+		return error;
+
+	xfs_ilock(ip, XFS_ILOCK_EXCL | lock_class);
+
+	error = xfs_iread_extents(tp, ip, XFS_DATA_FORK);
+	if (error)
+		goto out_unlock;
+
+	if (xfs_inode_has_attr_fork(ip)) {
+		error = xfs_iread_extents(tp, ip, XFS_ATTR_FORK);
+		if (error)
+			goto out_unlock;
+	}
+
+out_unlock:
+	xfs_iunlock(ip, XFS_ILOCK_EXCL | lock_class);
+	xfs_trans_cancel(tp);
+	return error;
+}
+
+/*
  * Get the bitmap and summary inodes and the summary cache into the mount
  * structure at mount time.
  */
@@ -1342,14 +1377,27 @@ xfs_rtmount_inodes(
 		return error;
 	ASSERT(mp->m_rbmip != NULL);
 
+	error = xfs_rtmount_iread_extents(mp->m_rbmip, XFS_ILOCK_RTBITMAP);
+	if (error)
+		goto out_rele_bitmap;
+
 	error = xfs_iget(mp, NULL, sbp->sb_rsumino, 0, 0, &mp->m_rsumip);
-	if (error) {
-		xfs_irele(mp->m_rbmip);
-		return error;
-	}
+	if (error)
+		goto out_rele_bitmap;
 	ASSERT(mp->m_rsumip != NULL);
+
+	error = xfs_rtmount_iread_extents(mp->m_rsumip, XFS_ILOCK_RTSUM);
+	if (error)
+		goto out_rele_summary;
+
 	xfs_alloc_rsum_cache(mp, sbp->sb_rbmblocks);
 	return 0;
+
+out_rele_summary:
+	xfs_irele(mp->m_rsumip);
+out_rele_bitmap:
+	xfs_irele(mp->m_rbmip);
+	return error;
 }
 
 void