linux-kernel - wanting to use mmap

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Date:	Mon, 31 Dec 2007 21:06:14 +1100
From:	"Jack Andrews" <effbiae@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: wanting to use mmap

hi all,

i read the O_DIRECT january thread:
  http://kerneltrap.org/mailarchive/linux-kernel/2007/1/11/44365

i am interested in using mmap as a quick way of getting data
to and from disk.  i also want to handle errors (like bad blocks)
as well as is possible using usual read/write calls.

would i be right in saying that
  a) mmap+madvise+msync
provides almost the same function as
  b) read/write(2)+posix_fadvise+fsync

i have read that fault-tolerance or error-handling is 'better'
using (b). what does this mean exactly?  i note that write(2)
may return EIO - what happens if the same underlying error
occurs when accessing a mmap'ed file?  i notice that in the
implementation of msync, fsync is called so errno might be
set to EIO...

ta, jack
(please cc: me)
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