Message-ID: <3C9B8DE5.7FF84BF3@attbi.com>
Date: Fri, 22 Mar 2002 14:02:45 -0600
From: Rakesh Tiwari <rakeshtiwari@attbi.com>
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To: linux-kernel <linux-kernel@vger.kernel.org>
Subject: 2.2.19(xx) file unmapping on abort
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Sender: linux-kernel-owner@vger.kernel.org

Relevant code -

../src/linux/mm/filemap.c
static void filemap_unmap(struct vm_area_struct *vma, unsigned long
start, size_t len)
{
    filemap_sync(vma, start, len, MS_ASYNC);
}


Question -

Does this imply that every time a process terminates abonormally, all
the dirty pages related to that mapping are flushed to the disk, even if
that was not intended ?  Why can not it be simply  this ? -

static void filemap_unmap(struct vm_area_struct *vma, unsigned long
start, size_t len)
{
    filemap_sync(vma, start, len, MS_INVALIDATE);
}

I call msync() at various points in the program where data in the pages
is known to be in good condition. At the abnormal program termination, I
am not really sure if data in pages is valid or not.....

Thank you.
Rakesh :-)

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