From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Morton <akpm@digeo.com>
Subject: Re: buffer head read/write
Date: Tue, 10 Dec 2002 12:13:01 -0800
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To: David Chow <davidchow@shaolinmicro.com>
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David Chow wrote:
> 
> Hi all,
> 
> Is there a way to make sure I submit a buffer head read/write and make
> sure it is commited immediately? (sychronized) . Please give direction
> on examples in the kernel code? Thanks.

grep wait_on_buffer fs/ext2/*.c - you'll see lots of examples.  eg:

        mark_buffer_dirty(bh);
        if (sb->s_flags & MS_SYNCHRONOUS) {
                ll_rw_block (WRITE, 1, &bh);
                wait_on_buffer (bh);
        }