From patchwork Thu Aug 29 13:26:48 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 13783257 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 40D261B3B06; Thu, 29 Aug 2024 13:27:07 +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=1724938027; cv=none; b=I29RlZPLrCKFr63SrVNBhqnrfTkRHFKurbgDUDQQ0MjKlOK4NsGMv4Yt28Zb+fmiH4Xtvgr5TDdwZxTOHOoOgO/4zAOp6Gqnrj/WLaJyYYyQCfMxuwRGjIkyLeWs7yTAYHWQHE9YncG32p0oa33c89TXw02XsaqMqKYdqBHhIjs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724938027; c=relaxed/simple; bh=JfSKC4ZiR8VXhh79ygO1NACM2pqc9kL0Q+Pv7T9qm5w=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=YvLF9ESnwbjDCOQf6UEQ8fyKb9rREwOf6HN3dKAc7WL+08j0GkhHJGyYuthQPZxedAfW6G0PSeDCEOLuzBAHMetFp4//BvIKJD4GYLELOrirXPuYB50WbTzy6fzK4HctY49NCt1lECWXlBboitnMX49NxO5xbR8/GdTdICJ8vLM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=SBMcz1CB; 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="SBMcz1CB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AAADFC4CECA; Thu, 29 Aug 2024 13:27:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724938027; bh=JfSKC4ZiR8VXhh79ygO1NACM2pqc9kL0Q+Pv7T9qm5w=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=SBMcz1CB3cDw68kftO6jXjH6N2H12TgJnWSp10fJ/3PgC3QqF65XlNQETjGxuE0UN HN28t7Q8TNA0PtZtsR4Y9q1zGC3xvBfzMgGV0U4dbgSyGcuz0PEHr9ByTbq3RdLx4L I9rvmUimMob9UzXltTvGp51B1ia+1YhIHD3+zLXwtC+BBgfBM3zCLTSMsS7nwTr1ao fQFQ5lUI2jl0T4s72wt1K1sTaT+IADI3ih9Mvk4y7dx04+iULctxKLzRNAC/opLv/v i9oYQsikM8MEA5uBrqPA8Y4mUSR7sEMCSnctjvlMYfl671LTZiwiwFeQLP0R5/yBmL y2lHp1R42nMkA== From: Jeff Layton Date: Thu, 29 Aug 2024 09:26:48 -0400 Subject: [PATCH v3 10/13] nfsd: implement OPEN_ARGS_SHARE_ACCESS_WANT_OPEN_XOR_DELEGATION Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240829-delstid-v3-10-271c60806c5d@kernel.org> References: <20240829-delstid-v3-0-271c60806c5d@kernel.org> In-Reply-To: <20240829-delstid-v3-0-271c60806c5d@kernel.org> To: Chuck Lever , Neil Brown , Olga Kornievskaia , Dai Ngo , Tom Talpey , Trond Myklebust , Anna Schumaker , Olga Kornievskaia , Alexander Viro , Christian Brauner , Jan Kara , Jonathan Corbet Cc: Tom Haynes , linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, Jeff Layton X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=5596; i=jlayton@kernel.org; h=from:subject:message-id; bh=JfSKC4ZiR8VXhh79ygO1NACM2pqc9kL0Q+Pv7T9qm5w=; b=owEBbQKS/ZANAwAIAQAOaEEZVoIVAcsmYgBm0HcY3VmreDvMgGpOswDK+ElxO7fff+tZqeY/+ DhA8R82516JAjMEAAEIAB0WIQRLwNeyRHGyoYTq9dMADmhBGVaCFQUCZtB3GAAKCRAADmhBGVaC FeEKD/wM7NUk4k/t0RaUvKNn/hkPN9YRxAJXGw8fJ1uOviu+XGyaLBTWVL5Cv5GBj0PjrRgkoEf hDqV/2R1O5KdYLShyzQ5snhLuBzmQoA6n73bJJp+uG2VnqbTzoOquXT1Jip0EMzomu916XAy0Gy XIOL+q5hSOKBFzW7Cu17usocQQjHDe+qQpBKcHtvrr2zJHct/r74lglrbOnzkbTyr9G+eTxBEjZ xnXIkwVyk+ta5ANVqrlhmU/hEu5x3lqyQ3q0nEJZzFtTYKJHruxJyAkKPfPypYqKrIKbdk22d4R uwFPRGIolRBHa3wvUOBGuux6yAaLxT6H6GxOTFoQywL85KXuNTUcVfB02vqHb9x0YF7a7HEakf0 2DHccfB/KaIE6CZCgCwiyx8URli0m90rKTBWQQyLu68VfWrIFxxd7SZ3hX2Xs/CoCMEWpEY+KfV y0+ViAe1UEB3t6bXKWVSn0CG58ySaZbaB6J/jo8H3Jr3Xbi+jU23VmlbbiEYKxp7Fs3DUWT3sV2 Ypt9Jud4SYVRMs9Ih/lglahkBxvQ+h2AC+UTPaLfGno7u1QEnyFfx9xcteeJk0oZpQkniJtu+lS ru0GD5KbeZ74y391TERE5iWDHJZhZZOELvENHIq+iyc7ukRTRZZpAc/rGnQ46Cknr2He3yG6QuW 8Zi0tfZ5oPrTTuA== X-Developer-Key: i=jlayton@kernel.org; a=openpgp; fpr=4BC0D7B24471B2A184EAF5D3000E684119568215 Allow clients to request getting a delegation xor an open stateid if a delegation isn't available. This allows the client to avoid sending a final CLOSE for the (useless) open stateid, when it is granted a delegation. This is done by moving the increment of the open stateid and unlocking of the st_mutex until after we acquire a delegation. If we get a delegation, we zero out the op_stateid field and set the NO_OPEN_STATEID flag. If the open stateid was brand new, then unhash it too in this case since it won't be needed. If we can't get a delegation or the new flag wasn't requested, then just increment and copy the open stateid as usual. Signed-off-by: Jeff Layton --- fs/nfsd/nfs4state.c | 28 ++++++++++++++++++++++++---- fs/nfsd/nfs4xdr.c | 5 +++-- include/uapi/linux/nfs4.h | 7 +++++-- 3 files changed, 32 insertions(+), 8 deletions(-) diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index dce27420ae31..c4e76427af92 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -6035,6 +6035,17 @@ static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open, */ } +/* Are we only returning a delegation stateid? */ +static bool open_xor_delegation(struct nfsd4_open *open) +{ + if (!(open->op_deleg_want & OPEN4_SHARE_ACCESS_WANT_OPEN_XOR_DELEGATION)) + return false; + if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ && + open->op_delegate_type != NFS4_OPEN_DELEGATE_WRITE) + return false; + return true; +} + /** * nfsd4_process_open2 - finish open processing * @rqstp: the RPC transaction being executed @@ -6057,6 +6068,7 @@ nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nf struct nfs4_delegation *dp = NULL; __be32 status; bool new_stp = false; + bool deleg_only = false; /* * Lookup file; if found, lookup stateid and check open request, @@ -6111,9 +6123,6 @@ nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nf open->op_odstate = NULL; } - nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid); - mutex_unlock(&stp->st_mutex); - if (nfsd4_has_session(&resp->cstate)) { if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) { open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT; @@ -6127,7 +6136,18 @@ nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nf * OPEN succeeds even if we fail. */ nfs4_open_delegation(open, stp, &resp->cstate.current_fh); + deleg_only = open_xor_delegation(open); nodeleg: + if (deleg_only) { + memcpy(&open->op_stateid, &zero_stateid, sizeof(open->op_stateid)); + open->op_rflags |= OPEN4_RESULT_NO_OPEN_STATEID; + if (new_stp) + release_open_stateid(stp); + } else { + nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid); + } + mutex_unlock(&stp->st_mutex); + status = nfs_ok; trace_nfsd_open(&stp->st_stid.sc_stateid); out: @@ -6143,7 +6163,7 @@ nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nf /* * To finish the open response, we just need to set the rflags. */ - open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX; + open->op_rflags |= NFS4_OPEN_RESULT_LOCKTYPE_POSIX; if (nfsd4_has_session(&resp->cstate)) open->op_rflags |= NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK; else if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED)) diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index c25dbfa0e7ea..11c6079e7dea 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -1066,7 +1066,7 @@ static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *sh return nfs_ok; if (!argp->minorversion) return nfserr_bad_xdr; - switch (w & NFS4_SHARE_WANT_MASK) { + switch (w & NFS4_SHARE_WANT_TYPE_MASK) { case NFS4_SHARE_WANT_NO_PREFERENCE: case NFS4_SHARE_WANT_READ_DELEG: case NFS4_SHARE_WANT_WRITE_DELEG: @@ -3407,7 +3407,8 @@ static __be32 nfsd4_encode_fattr4_xattr_support(struct xdr_stream *xdr, #define NFSD_OA_SHARE_ACCESS_WANT (BIT(OPEN_ARGS_SHARE_ACCESS_WANT_ANY_DELEG) | \ BIT(OPEN_ARGS_SHARE_ACCESS_WANT_NO_DELEG) | \ - BIT(OPEN_ARGS_SHARE_ACCESS_WANT_CANCEL)) + BIT(OPEN_ARGS_SHARE_ACCESS_WANT_CANCEL) | \ + BIT(OPEN_ARGS_SHARE_ACCESS_WANT_OPEN_XOR_DELEGATION)) #define NFSD_OA_OPEN_CLAIM (BIT(OPEN_ARGS_OPEN_CLAIM_NULL) | \ BIT(OPEN_ARGS_OPEN_CLAIM_PREVIOUS) | \ diff --git a/include/uapi/linux/nfs4.h b/include/uapi/linux/nfs4.h index caf4db2fcbb9..4273e0249fcb 100644 --- a/include/uapi/linux/nfs4.h +++ b/include/uapi/linux/nfs4.h @@ -58,7 +58,7 @@ #define NFS4_SHARE_DENY_BOTH 0x0003 /* nfs41 */ -#define NFS4_SHARE_WANT_MASK 0xFF00 +#define NFS4_SHARE_WANT_TYPE_MASK 0xFF00 #define NFS4_SHARE_WANT_NO_PREFERENCE 0x0000 #define NFS4_SHARE_WANT_READ_DELEG 0x0100 #define NFS4_SHARE_WANT_WRITE_DELEG 0x0200 @@ -66,13 +66,16 @@ #define NFS4_SHARE_WANT_NO_DELEG 0x0400 #define NFS4_SHARE_WANT_CANCEL 0x0500 -#define NFS4_SHARE_WHEN_MASK 0xF0000 +#define NFS4_SHARE_WHEN_MASK 0xF0000 #define NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL 0x10000 #define NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED 0x20000 +#define NFS4_SHARE_WANT_MOD_MASK 0xF00000 #define NFS4_SHARE_WANT_DELEG_TIMESTAMPS 0x100000 #define NFS4_SHARE_WANT_OPEN_XOR_DELEGATION 0x200000 +#define NFS4_SHARE_WANT_MASK (NFS4_SHARE_WANT_TYPE_MASK | NFS4_SHARE_WANT_MOD_MASK) + #define NFS4_CDFC4_FORE 0x1 #define NFS4_CDFC4_BACK 0x2 #define NFS4_CDFC4_BOTH 0x3