1 files changed, 9 insertions, 1 deletions

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 90a30ce822fc..faf5bd056a93 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4191,9 +4191,17 @@ static void ext4_mb_group_or_file(struct ext4_allocation_context *ac)
                 return;
 
         size = ac->ac_o_ex.fe_logical + ac->ac_o_ex.fe_len;
-        isize = i_size_read(ac->ac_inode) >> bsbits;
+        isize = (i_size_read(ac->ac_inode) + ac->ac_sb->s_blocksize - 1)
+                >> bsbits;
         size = max(size, isize);
 
+        if ((size == isize) &&
+            !ext4_fs_is_busy(sbi) &&
+            (atomic_read(&ac->ac_inode->i_writecount) == 0)) {
+                ac->ac_flags |= EXT4_MB_HINT_NOPREALLOC;
+                return;
+        }
+
         /* don't use group allocation for large files */
         if (size >= sbi->s_mb_stream_request) {
                 ac->ac_flags |= EXT4_MB_STREAM_ALLOC;