From: Tao Ma Date: Thu, 10 Sep 2009 07:28:47 +0000 (+0800) Subject: ocfs2: Use buffer IO if we are appending a file. X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=b80474b432913f73cce8db001e9fa3104f9b79ee;p=deliverable%2Flinux.git ocfs2: Use buffer IO if we are appending a file. In ocfs2_file_aio_write, we will prevent direct io if we find that we are appending(changing i_size) and call generic_file_aio_write_nolock. But actually O_DIRECT flag is there and this function will call generic_file_direct_write eventually which will update i_size and leave di->i_size alone. The bug is http://oss.oracle.com/bugzilla/show_bug.cgi?id=1173. So this patch let ocfs2_direct_IO returns 0 directly if we are appending so that buffered write will be called and di->i_size get updated successfully. And this is also what we want in ocfs2_file_aio_write. Signed-off-by: Tao Ma Signed-off-by: Joel Becker --- diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c index 33e03c551127..72e76062a900 100644 --- a/fs/ocfs2/aops.c +++ b/fs/ocfs2/aops.c @@ -690,6 +690,10 @@ static ssize_t ocfs2_direct_IO(int rw, if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) return 0; + /* Fallback to buffered I/O if we are appending. */ + if (i_size_read(inode) <= offset) + return 0; + ret = blockdev_direct_IO_no_locking(rw, iocb, inode, inode->i_sb->s_bdev, iov, offset, nr_segs,