ext4: fix ext4_ext_direct_IO()'s return value after converting uninit extents

After a direct I/O request covering an uninitalized extent (i.e.,
created using the fallocate system call) or a hole in a file, ext4
will convert the uninitialized extent so it is marked as initialized
by calling ext4_convert_unwritten_extents().  This function returns
zero on success.

This return value was getting returned by ext4_direct_IO(); however
the file system's direct_IO function is supposed to return the number
of bytes read or written on a success.  By returning zero, it confused
the direct I/O code into falling back to buffered I/O unnecessarily.

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

2 files changed, 8 insertions, 3 deletions

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 10539e364283..441716f33b4a 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3519,6 +3519,7 @@ retry:
  *
  * This function is called from the direct IO end io call back
  * function, to convert the fallocated extents after IO is completed.
+ * Returns 0 on success.
  */
 int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
                                     loff_t len)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index d1ec698a91d1..12d727f8fedf 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3772,13 +3772,17 @@ static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb,
                 if (ret != -EIOCBQUEUED && ret <= 0 && iocb->private) {
                         ext4_free_io_end(iocb->private);
                         iocb->private = NULL;
-                } else if (ret > 0)
+                } else if (ret > 0) {
+                        int err;
                         /*
                          * for non AIO case, since the IO is already
                          * completed, we could do the convertion right here
                          */
-                        ret = ext4_convert_unwritten_extents(inode,
-                                                                offset, ret);
+                        err = ext4_convert_unwritten_extents(inode,
+                                                             offset, ret);
+                        if (err < 0)
+                                ret = err;
+                }
                 return ret;
         }