2 files changed, 4 insertions, 3 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index b3ecca447ddf..d2b3a5e9a621 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -6143,7 +6143,7 @@ again:
         if (ret == -ENOSPC) {
                 if (!final_tried) {
                         num_bytes = num_bytes >> 1;
-                        num_bytes = num_bytes & ~(root->sectorsize - 1);
+                        num_bytes = round_down(num_bytes, root->sectorsize);
                         num_bytes = max(num_bytes, min_alloc_size);
                         if (num_bytes == min_alloc_size)
                                 final_tried = true;
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 4e6a11c2cfdd..3bc62b181ef8 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7894,8 +7894,9 @@ static int __btrfs_prealloc_file_range(struct inode *inode, int mode,
                         }
                 }
 
-                ret = btrfs_reserve_extent(trans, root, num_bytes, min_size,
-                                           0, *alloc_hint, &ins, 1);
+                ret = btrfs_reserve_extent(trans, root,
+                                           min(num_bytes, 256ULL * 1024 * 1024),
+                                           min_size, 0, *alloc_hint, &ins, 1);
                 if (ret) {
                         if (own_trans)
                                 btrfs_end_transaction(trans, root);