diff --git a/fs/btrfs/verity.c b/fs/btrfs/verity.c
index ebada817bd33..4e0ab5842274 100644
--- a/fs/btrfs/verity.c
+++ b/fs/btrfs/verity.c
@@ -720,14 +720,18 @@ static struct page *btrfs_read_merkle_tree_page(struct inode *inode,
 			goto out;
 
 		folio_lock(folio);
-		/* If it's not uptodate after we have the lock, we got a read error. */
-		if (!folio_test_uptodate(folio)) {
+		/* Folio was truncated from mapping. */
+		if (!folio->mapping) {
 			folio_unlock(folio);
 			folio_put(folio);
-			return ERR_PTR(-EIO);
+			goto again;
 		}
-		folio_unlock(folio);
-		goto out;
+		/* Another reader may have filled the folio while we waited. */
+		if (folio_test_uptodate(folio)) {
+			folio_unlock(folio);
+			goto out;
+		}
+		goto read_folio;
 	}
 
 	folio = filemap_alloc_folio(mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS),
@@ -744,6 +748,7 @@ static struct page *btrfs_read_merkle_tree_page(struct inode *inode,
 		return ERR_PTR(ret);
 	}
 
+read_folio:
 	/*
 	 * Merkle item keys are indexed from byte 0 in the merkle tree.
 	 * They have the form:
@@ -753,6 +758,7 @@ static struct page *btrfs_read_merkle_tree_page(struct inode *inode,
 	ret = read_key_bytes(BTRFS_I(inode), BTRFS_VERITY_MERKLE_ITEM_KEY, off,
 			     folio_address(folio), PAGE_SIZE, folio);
 	if (ret < 0) {
+		folio_unlock(folio);
 		folio_put(folio);
 		return ERR_PTR(ret);
 	}