From patchwork Thu Jan 23 19:52:41 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chuck Lever X-Patchwork-Id: 13948601 X-Patchwork-Delegate: cel@kernel.org 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 D9A7C7E105 for ; Thu, 23 Jan 2025 19:52:49 +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=1737661969; cv=none; b=ilGyg2Rlfyr3DDn0BUeoVDYSBZZJI/IVcC+lSk4DN1DXLPkVQSqvNyFmMQoasFj5rjOLuL2L3sY1WRFrUsP+bTZ+J30ohy66O6EpuAddEuuWoy/+Ie6iCuCvnVIjF2FmLiwzThsSl2QYUR3yVXhvSrSuLyt+fiNu5yFYMzu9LF8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737661969; c=relaxed/simple; bh=Spytuyccow0fo6u3nkrQ6bjUCKHsP46lrURrpOBvSYs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pmoFkPa/AryOsXWvL28lkKHZJ15cnr5s1bEgy2xjo9BXilOfXfylhZYwteedF8J+C+e5BlCunjG+xLxxK9Gy0o+qz9yPFVuXZXdgGfh7lG4dhSJvv/qR5vKvNJ300byrmEY5dsxLYUW8YUB2Gf7UbI8wbiMwSPs/5X/BIbjnZHI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XgHIMSre; 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="XgHIMSre" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B2548C4CEE2; Thu, 23 Jan 2025 19:52:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1737661969; bh=Spytuyccow0fo6u3nkrQ6bjUCKHsP46lrURrpOBvSYs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XgHIMSreSYL27cb5JdSS0SwkeQYjZoCHKd9AwXmBv4/GZqAjd8mNaAUsignMyc93l ugIVoyhBCOoRs75xnp1/jEBkGwByllDSnwRIvTiL+KFxwLnMUXYLcy3YqDj2KsbkjI dARYfoMAlgwIHkk2F27cYzfuUfwMqgeDfttacezPaCdeZDKEu+x1EKlUZUmsiPjESJ li+br83jSLyn/up0EVjMiV2edmTZl3xgMwhb9x86+yrLqbC7sG7YG4s0Hfe34pbded TYFN9VNXhMqGPSac3vm+lQkbQrZMZGlnMwtbQJXchmcS2DUctAS4/NyxiMS639q/Mx ZyfGUcvNzOodg== From: cel@kernel.org To: Neil Brown , Jeff Layton , Olga Kornievskaia , Dai Ngo , Tom Talpey Cc: , Chuck Lever Subject: [RFC PATCH 3/4] NFSD: Return NFS4ERR_FILE_OPEN only when renaming over an open file Date: Thu, 23 Jan 2025 14:52:41 -0500 Message-ID: <20250123195242.1378601-4-cel@kernel.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20250123195242.1378601-1-cel@kernel.org> References: <20250123195242.1378601-1-cel@kernel.org> Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Chuck Lever RFC 8881 Section 18.26.4 paragraphs 1 - 3 tell us that RENAME should return NFS4ERR_FILE_OPEN only when the target object is a file that is currently open. If the target is a directory, some other status must be returned. Generally I expect that a delegation recall will be triggered in some of these circumstances. In other cases, the VFS might return -EBUSY for other reasons, and NFSD has to ensure that errno does not leak to clients as a status code that is not permitted by spec. There are some error flows where the target dentry hasn't been found yet. The default value for @type therefore is S_IFDIR to return an alternate status code in those cases. Signed-off-by: Chuck Lever --- fs/nfsd/vfs.c | 30 ++++++++++++++++++++++++++---- 1 file changed, 26 insertions(+), 4 deletions(-) diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 3ead7fb3bf04..5cfb5eb54c23 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -1795,9 +1795,19 @@ nfsd_has_cached_files(struct dentry *dentry) return ret; } -/* - * Rename a file - * N.B. After this call _both_ ffhp and tfhp need an fh_put +/** + * nfsd_rename - rename a directory entry + * @rqstp: RPC transaction context + * @ffhp: the file handle of parent directory containing the entry to be renamed + * @fname: the filename of directory entry to be renamed + * @flen: the length of @fname in octets + * @tfhp: the file handle of parent directory to contain the renamed entry + * @tname: the filename of the new entry + * @tlen: the length of @tlen in octets + * + * After this call _both_ ffhp and tfhp need an fh_put. + * + * Returns a generic NFS status code in network byte-order. */ __be32 nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, @@ -1805,6 +1815,7 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, { struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; struct inode *fdir, *tdir; + int type = S_IFDIR; __be32 err; int host_err; bool close_cached = false; @@ -1867,6 +1878,7 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, host_err = PTR_ERR(ndentry); if (IS_ERR(ndentry)) goto out_dput_old; + type = d_inode(ndentry)->i_mode & S_IFMT; host_err = -ENOTEMPTY; if (ndentry == trap) goto out_dput_new; @@ -1904,7 +1916,17 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, out_dput_old: dput(odentry); out_nfserr: - err = nfserrno(host_err); + if (host_err == -EBUSY) { + /* + * See RFC 8881 Section 18.26.4 para 1-3: NFSv4 RENAME + * status distinguishes between reg file and dir. + */ + if (type != S_IFDIR) + err = nfserr_file_open; + else + err = nfserr_acces; + } else + err = nfserrno(host_err); if (!close_cached) { fh_fill_post_attrs(ffhp);