Date: Fri, 3 Jun 2011 13:59:04 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: Bruce Evans <brde@optusnet.com.au> Cc: freebsd-fs@freebsd.org, rmacklem@freebsd.org Subject: Re: [PATCH] Set the DE_UPDATE flag on the directory node on msdosfs Message-ID: <20110603105904.GM48734@deviant.kiev.zoral.com.ua> In-Reply-To: <20110603173555.X994@besplex.bde.org> References: <1307069726.2024.18.camel@nsl> <1307071973.2024.19.camel@nsl> <20110603173555.X994@besplex.bde.org>
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--p/yOlLEfnp/ZBhGR Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Jun 03, 2011 at 06:25:07PM +1000, Bruce Evans wrote: > On Fri, 3 Jun 2011, Kevin Lo wrote: >=20 > >Kevin Lo wrote: > >>If you try to NFS export a fat32 formatted external usb devices, > >>you'll notice if a new file is created, you won't see that file > >>on the NFS client. The reason is msdosfs(5) doesn't change the > >>modify time of the directory when an entry is created. > >> > >>Attached is a patch against HEAD that sets DE_UPDATE on the > >>directory node in both createde() and removede(). > >>Please test it, thanks. >=20 > It breaks compatibility with MSDOS and Windows. >=20 > No correct fix is evident. ffs maintains the generation count va_filerev > which should help, but: > - ffs only increments it when a file mtime is updated. > - msdosfs doesn't properly maintain it (it initializes to a non-random > number related to the current time when the vnode is initialized, but > never increments it). > - the old nfs client doesn't use it > - the new nfs client does use it for v4. I don't know if this use is > sufficient (it has to get it from the server to work for this). It seems that reporter forgot to mention this, but the problem was reported for the _linux_ NFS client mounting FAT share from the FreeBSD server. --p/yOlLEfnp/ZBhGR Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (FreeBSD) iEYEARECAAYFAk3ovncACgkQC3+MBN1Mb4h1uACdGiVfIoDaiIqC1giLotN5Tk3x xSUAoLNpnJEms05CTZceWpBd0Lj0799d =xFLr -----END PGP SIGNATURE----- --p/yOlLEfnp/ZBhGR--
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