On Fri, Oct 26, 2007 at 01:30:52PM +0200, Miklos Szeredi wrote:
quoted text
> On Thu, 2007-10-25 at 23:40 -0700, jjohansen@suse.de wrote:
> > plain text document attachment (file-handle-ops.diff)
> > Struct iattr already contains ia_file since commit cc4e69de from=20
> > Miklos (which is related to commit befc649c). Use this to pass
> > struct file down the setattr hooks. This allows LSMs to distinguish
> > operations on file descriptors from operations on paths.
>=20
> There's a slight problem (other than HCH not liking it) with this
> approach of passing the open file in iattr:  for special files, the
> struct file pointer makes no sense to the filesystem, since it is always
> opened by the generic functions.
>=20
true

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> This wasn't a problem with ftruncate(), because that one only works on
> regular files, but fchmod/fchown/futimes will work on special files as
> well, and the filesystem interpreting file->private_data could cause
> nasty bugs.=20
>=20
> So I think the correct solution (which was suggested by Trond and
> others) is to define an f_op->fsetattr() method, which interested
> filesystems can define.
>=20
yeah that does sound like the way to go, thank Miklos

regards
john