From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2EEC9159209 for ; Thu, 23 Jan 2025 20:43:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737665023; cv=none; b=TPGXDcp3yje0Y5jodkvQIoLG3opTspuPOzWij2Q069aWFoNM3fW4D7JR3YGAzLt8VIZ+T2N163kMygdYuf9U6kzPr/4v9FKs3lL1ZjsojYkMSXwD1tN57Q/dZ8Js2CNqCufl5j++pe5X+uF6QknFv9WOSlriNYaJlpgwJAFMjY8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737665023; c=relaxed/simple; bh=bng5Z5Z6SCd5QKWexiGm0uqhwyS6+4YEZV8WWk53EOU=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=XaGGybY7SigP1muH4FhxyXWp2ctz6ScdkSOqYrgNHib91Ek76BK15ICoBBqN4iGqm/IWeyfCJ4WsEAsW7q62RUsN/FeyxEVRnQ7MTn97XgZfGdx/GGYAqNcG3cHm4Jw3ktbySsdSWYXRViFbysnu9FS4rWT88qSdip3QRq3eRdc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=SKy88k63; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="SKy88k63" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DFDA4C4CED3; Thu, 23 Jan 2025 20:43:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1737665021; bh=bng5Z5Z6SCd5QKWexiGm0uqhwyS6+4YEZV8WWk53EOU=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=SKy88k63gWQJpoKhF2SssiMXRkBmv0hHLw3SOLjYDvmx+EGt2OOBKkBjxLpfLPs62 x0e83cMQisP8B6OaqoIgyvrVOPf7rOk4Kvetri0y0b+FgFkGY8+cmV16nmExVsSVSa SZvvJ+v8nBZp4moLWLi3kmlY1QaQ7Bz1BTWv4NUiMgklDkcSXeVmTP/8RIwV5orGK4 toz0S6O3wqcsDHpLn9r1yY4miqYjmjm2JKFX5xb3OcxpmZmhWO7NIWAmUwG4+uwti5 QthQITvkT2AduI1C4B2zVpp3tU+kremo2DP8tXNpWpRmGBWdv/MLeWCazo3+D/4pI4 7FZI8CxgDkMRQ== Message-ID: <8565d8e45073f76705a23e00eedd4d911f24a360.camel@kernel.org> Subject: Re: [RFC PATCH 2/4] NFSD: Never return NFS4ERR_FILE_OPEN when removing a directory From: Jeff Layton To: cel@kernel.org, Neil Brown , Olga Kornievskaia , Dai Ngo , Tom Talpey Cc: linux-nfs@vger.kernel.org, Chuck Lever , Trond Myklebust Date: Thu, 23 Jan 2025 15:43:39 -0500 In-Reply-To: <20250123195242.1378601-3-cel@kernel.org> References: <20250123195242.1378601-1-cel@kernel.org> <20250123195242.1378601-3-cel@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV 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Thu, 2025-01-23 at 14:52 -0500, cel@kernel.org wrote: > From: Chuck Lever >=20 > RFC 8881 Section 18.25.4 paragraph 5 tells us that the server > should return NFS4ERR_FILE_OPEN only if the target object is an > opened file. This suggests that returning this status when removing > a directory will confuse NFS clients. >=20 > This is a version-specific issue; nfsd_proc_remove/rmdir() and > nfsd3_proc_remove/rmdir() already return nfserr_access as > appropriate. >=20 > Unfortunately there is no quick way for nfsd4_remove() to determine > whether the target object is a file or not, so the check is done in > to nfsd_unlink() for now. >=20 > Reported-by: Trond Myklebust > Fixes: 466e16f0920f ("nfsd: check for EBUSY from vfs_rmdir/vfs_unink.") > Signed-off-by: Chuck Lever > --- > fs/nfsd/vfs.c | 24 ++++++++++++++++++------ > 1 file changed, 18 insertions(+), 6 deletions(-) >=20 > diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c > index 2d8e27c225f9..3ead7fb3bf04 100644 > --- a/fs/nfsd/vfs.c > +++ b/fs/nfsd/vfs.c > @@ -1931,9 +1931,17 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh = *ffhp, char *fname, int flen, > return err; > } > =20 > -/* > - * Unlink a file or directory > - * N.B. After this call fhp needs an fh_put > +/** > + * nfsd_unlink - remove a directory entry > + * @rqstp: RPC transaction context > + * @fhp: the file handle of the parent directory to be modified > + * @type: enforced file type of the object to be removed > + * @fname: the name of directory entry to be removed > + * @flen: length of @fname in octets > + * > + * After this call fhp needs an fh_put. > + * > + * Returns a generic NFS status code in network byte-order. > */ > __be32 > nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, > @@ -2007,10 +2015,14 @@ nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh= *fhp, int type, > fh_drop_write(fhp); > out_nfserr: > if (host_err =3D=3D -EBUSY) { > - /* name is mounted-on. There is no perfect > - * error status. > + /* > + * See RFC 8881 Section 18.25.4 para 4: NFSv4 REMOVE > + * distinguishes between reg file and dir. > */ > - err =3D nfserr_file_open; > + if (type !=3D S_IFDIR) Should that be "if (type =3D=3D S_ISREG)" instead? What if the inode is a named pipe or device file? I'm not sure you can ever get EBUSY with those, but in case you can, what's the right error in those cases? > + err =3D nfserr_file_open; > + else > + err =3D nfserr_acces; > } > out: > return err !=3D nfs_ok ? err : nfserrno(host_err); --=20 Jeff Layton