Re: [PATCH] fsync.2 updates

Hi!

On 2011-11-04 6:12:04, Christoph Hellwig wrote:

- fsync works on any fd and does not require a writeable one,
  correct the EBADF error code explanation.

The problem is, while this is true for Linux, that's not a safe portable
assumption to make on POSIX in general as that behaviour is not
specified and as such is implementation specific, some Unix systems
do actually fail on read-only file descriptors, for example:

  <http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/V50_HTML/MAN/MAN2/0033____.HTM>
  <http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/fsync.htm>

So if this part of the patch gets applied it would be nice to add a
note stating this is Linux specific behaviour, and that other systems
might still fail on such condition.

regards,
guillem
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