Messages in this thread | | | Date | Thu, 24 Apr 2008 16:12:35 +0100 | From | Al Viro <> | Subject | Re: [patch 00/13] vfs: add helpers to check r/o bind mounts |
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On Thu, Apr 24, 2008 at 04:53:27PM +0200, Miklos Szeredi wrote: > > > > RTFS. permission() doesn't do "is that vfsmount read-only" checks, exactly > > > > because it's 100% bogus - either you cover it with entire area where we > > > > are guaranteed to stay r/w, or it's by definition racy. > > > > > > I know that. > > > > > > That does not mean, that fh_verify() needs to do vfsmount r/o checks. > > > AFAICS it's perfectly OK to do that later, around the vfs_ call. > > > > ... and around everything else that happens to be done after fh_verify > > for write access, surely? > > What in particular? You have managed to avoid answering this question > for the last...I don't know how many emails.
Oh, for fuck sake... grep and ye shall see. Right next to setattr we have nfsd4_set_nfs4_acl(), with pair of set_nfsv4_acl_one(). I'd rather have those two covered by a single will/wont range, TYVM.
nfsd_create() will happily do vfs_mkdir() and nfsd_create_setattr(). Ditto.
And while we are at it, losing the check for r/o in fh_verify() will sure as hell require at least handling it separately on the normal write path.
> > Note that e.g. nfsd_setattr() does _not_ call > > vfs_<anything>()... > > Yes it does: notify_change(). It's vfs_setattr() under a pseudonym.
Are you going to move the will/wont in there? Because there's a bunch of stuff in fs/open.c that will disagree...
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