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 A6BCB1885B0; Wed, 11 Sep 2024 13:24:29 +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=1726061069; cv=none; b=syFSCVUHQirNNLPxuhn+JdkpzWuorweGIISqOoSMRmzaen89IrnPMIhWKFcBYb7Nrt7vx56ayH7INR+RGybrUHV3hQ+Fo/ci3Xl7EjHWeOOV6UUps3ZBpTCdE+RUuZiLGCxv7Yc8+D2tcgJ3kvCt+1ZwZRtdeyKDXJGl8H7aPoc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726061069; c=relaxed/simple; bh=rv6KloLUSr3zhNpK24ogyvdvBVM4B5loa/mPlyN4irU=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=tNxubj03o41zqFWlxZipL1bSMocPtvPPX5jv+F8uuwwat5iN38o5lM4RgTBWdt9QkMPwDVMf/JuaGB5+yNOVyROxbDwcPwLIt8qVRPaIEvadgqr9T6e1klkMj0W6NvX6GnZ+kxpknBExxUtkrdL5vvWoTcyvrFpEXTOsulpYsh0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Ssp0z6sz; 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="Ssp0z6sz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3596FC4CEC7; Wed, 11 Sep 2024 13:24:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726061069; bh=rv6KloLUSr3zhNpK24ogyvdvBVM4B5loa/mPlyN4irU=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=Ssp0z6szKOqcYj85s7VN8I6Mw+AY0tK02pAIZjowHzHHUPLxjK5zi+mZArWpnO2Ro bZ92BqmxQDlOsa4/z4B7pteHHi1i8jsvXtNcJ5EucweyhOMflaNRIfM90mjRW8Uf8D 8PSWRikFrCHFeX2V/7LZ1je7/enk+hlU/wJIavaw+izhH21mGuu26TXzsErXrCF7as MQfmY1U7sNgBhjWe0D2wMobv2za0DS/EF/Jew6CNo/GXK19v6FlSExLjeUYX6MRcA6 G2C07n2X4q5A/DRqoCb4xnoSZ4kUGs5mMHgfak+1Tue0sgNXDNpVIYjibluWV/jvyk qS7Upt8LBtVyg== Message-ID: <00b44eb3ce8ebdd76bfd81d653967d5e85910e11.camel@kernel.org> Subject: Re: [PATCH 1/7] lockd: introduce safe async lock op From: Jeff Layton To: Benjamin Coddington Cc: Alexander Aring , linux-nfs@vger.kernel.org, ocfs2-devel@lists.linux.dev, linux-fsdevel@vger.kernel.org, teigland@redhat.com, rpeterso@redhat.com, agruenba@redhat.com, trond.myklebust@hammerspace.com, anna@kernel.org, chuck.lever@oracle.com Date: Wed, 11 Sep 2024 09:24:26 -0400 In-Reply-To: References: <20230823213352.1971009-1-aahringo@redhat.com> <20230823213352.1971009-2-aahringo@redhat.com> <1490adc3ae3f82968c6112bb6f9df3c3f2229b04.camel@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw 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Evolution 3.52.4 (3.52.4-1.fc40) Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2024-09-10 at 12:56 -0400, Benjamin Coddington wrote: > On 10 Sep 2024, at 11:45, Jeff Layton wrote: >=20 > > On Tue, 2024-09-10 at 10:18 -0400, Benjamin Coddington wrote: > > > On 23 Aug 2023, at 17:33, Alexander Aring wrote: > > >=20 > > > > This patch reverts mostly commit 40595cdc93ed ("nfs: block notifica= tion > > > > on fs with its own ->lock") and introduces an EXPORT_OP_SAFE_ASYNC_= LOCK > > > > export flag to signal that the "own ->lock" implementation supports > > > > async lock requests. The only main user is DLM that is used by GFS2= and > > > > OCFS2 filesystem. Those implement their own lock() implementation a= nd > > > > return FILE_LOCK_DEFERRED as return value. Since commit 40595cdc93e= d > > > > ("nfs: block notification on fs with its own ->lock") the DLM > > > > implementation were never updated. This patch should prepare for DL= M > > > > to set the EXPORT_OP_SAFE_ASYNC_LOCK export flag and update the DLM > > > > plock implementation regarding to it. > > > >=20 > > > > Acked-by: Jeff Layton > > > > Signed-off-by: Alexander Aring > > > > --- > > > > fs/lockd/svclock.c | 5 ++--- > > > > fs/nfsd/nfs4state.c | 13 ++++++++++--- > > > > include/linux/exportfs.h | 8 ++++++++ > > > > 3 files changed, 20 insertions(+), 6 deletions(-) > > > >=20 > > > > diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c > > > > index c43ccdf28ed9..6e3b230e8317 100644 > > > > --- a/fs/lockd/svclock.c > > > > +++ b/fs/lockd/svclock.c > > > > @@ -470,9 +470,7 @@ nlmsvc_lock(struct svc_rqst *rqstp, struct nlm_= file *file, > > > > struct nlm_host *host, struct nlm_lock *lock, int wait, > > > > struct nlm_cookie *cookie, int reclaim) > > > > { > > > > -#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) > > > > struct inode *inode =3D nlmsvc_file_inode(file); > > > > -#endif > > > > struct nlm_block *block =3D NULL; > > > > int error; > > > > int mode; > > > > @@ -486,7 +484,8 @@ nlmsvc_lock(struct svc_rqst *rqstp, struct nlm_= file *file, > > > > (long long)lock->fl.fl_end, > > > > wait); > > > >=20 > > > > - if (nlmsvc_file_file(file)->f_op->lock) { > > > > + if (!export_op_support_safe_async_lock(inode->i_sb->s_export_op, > > > > + nlmsvc_file_file(file)->f_op)) { > > >=20 > > > ... but don't most filesystem use VFS' posix_lock_file(), which does = the > > > right thing? I think this patch has broken async lock callbacks for = NLM for > > > all the other filesystems that just use posix_lock_file(). > > >=20 > > > Maybe I'm missing something, but why was that necessary? > > >=20 > >=20 > > Good catch. Yeah, I think that probably should have been an && > > condition. IOW: > >=20 > > if (nlmsvc_file_file(file)->f_op->lock && > > !export_op_support_safe_async_lock(inode->i_sb->s_export_op= , > >=20 >=20 > Ah Jeff, thanks for confirming - there's been a bunch of changes in there= that > made me uncertain. I can send a patch for this, I'd like to rename > export_op_support_safe_async_lock to something like fs_can_defer_lock > (suggestions) and put the test in there. Actually, I take it back. The only callers that set export_op_support_safe_async_lock have ->lock as non-NULL, so that won't change anything, in practice. --=20 Jeff Layton