ocfs2: take meta data lock in ocfs2_file_aio_read()

Temporarily take the meta data lock in ocfs2_file_aio_read() to allow us to
update our inode fields.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 20fffee..a9559c8 100644 (file)
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -1168,6 +1168,22 @@ static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
                ocfs2_iocb_set_rw_locked(iocb);
        }
 
+       /*
+        * We're fine letting folks race truncates and extending
+        * writes with read across the cluster, just like they can
+        * locally. Hence no rw_lock during read.
+        * 
+        * Take and drop the meta data lock to update inode fields
+        * like i_size. This allows the checks down below
+        * generic_file_aio_read() a chance of actually working. 
+        */
+       ret = ocfs2_meta_lock(inode, NULL, NULL, 0);
+       if (ret < 0) {
+               mlog_errno(ret);
+               goto bail;
+       }
+       ocfs2_meta_unlock(inode, 0);
+
        ret = generic_file_aio_read(iocb, buf, count, iocb->ki_pos);
        if (ret == -EINVAL)
                mlog(ML_ERROR, "generic_file_aio_read returned -EINVAL\n");