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>

1 files changed, 16 insertions, 0 deletions

diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 20fffeed630b..a9559c874530 100644
--- 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");