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 EF08714AA9 for ; Wed, 26 Mar 2025 00:15:23 +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=1742948124; cv=none; b=i1U1BPG3v+3RguD/sHkUNdrA6t3FYUepKbfYWM2Jm289V5u/Bfwjh3H2gxzkjc8SMjstHBTUZPdY2QUgh84aAS3S/v7ePBwfMAtPyxodVbllPRju5qxZpMAXcIb8btDHyFtIqlVYfVz5QK7n13OvK1W6b0if6LWi3mNQDFTiv/s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742948124; c=relaxed/simple; bh=I1Dh69G6sYZ6wxdNGWBIiFmnN+gXkn42S1AgjuOSZM4=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=h+0dx0y87gLau9LNKHtP0quVRN7aqoIeiAIforEahMCJQCQ4jAob/lRTo308+kFZEKhzhFMAIs/ie9Y1coaEkU+NwaMes2HDaJ4WtoLHD4vaQ3EOzAASg/nzioysnggUEjp471D9TSA+T1MUtio2CQid9bp74RNGJilbAoHxF7Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=aYNo+LxU; 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="aYNo+LxU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0F178C4CEE4; Wed, 26 Mar 2025 00:15:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1742948123; bh=I1Dh69G6sYZ6wxdNGWBIiFmnN+gXkn42S1AgjuOSZM4=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=aYNo+LxU9Hzw0ut0twHIJFlgUDvlYd2u8KJMSxs6MfeGqP9DwK+5crjnh8YevTFrh +rPCl81igX2mAYn8MjVgYY98NjLV5GNoebb3wsHPveQxZOh3VrYndJDK9SyA9i5dbj ooU2cRhnKky0nfyLE6zoHkjwx+sK0jJRUuMx556ymn7Cp7fj5gNYK2t3mVfAOuyDta gLUrTiPK6MPC/CfWeneDn9/H1FCZFMuDD1ix/f2e81ndBmKUxhG1CFsZjHPsGHzcAW Dwb9zb9tlOiFHLsgbUnprS+N6wqKeqj//HhRmRdH6OCG1/btabJAfEmv+enY2WqXa+ Cyib+1nM577dg== Message-ID: Subject: Re: [PATCH v3 3/6] NFS: Shut down the nfs_client only after all the superblocks From: Jeff Layton To: trondmy@kernel.org, linux-nfs@vger.kernel.org Cc: Josef Bacik , Benjamin Coddington Date: Tue, 25 Mar 2025 20:15:21 -0400 In-Reply-To: <1cefd7cbadf0eaec5bae66e0870cdb89c7120070.1742941932.git.trond.myklebust@hammerspace.com> References: <1cefd7cbadf0eaec5bae66e0870cdb89c7120070.1742941932.git.trond.myklebust@hammerspace.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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>=20 > The nfs_client manages state for all the superblocks in the > "cl_superblocks" list, so it must not be shut down until all of them are > gone. >=20 > Fixes: 7d3e26a054c8 ("NFS: Cancel all existing RPC tasks when shutdown") > Signed-off-by: Trond Myklebust > --- > fs/nfs/sysfs.c | 22 +++++++++++++++++++++- > 1 file changed, 21 insertions(+), 1 deletion(-) >=20 > diff --git a/fs/nfs/sysfs.c b/fs/nfs/sysfs.c > index b30401b2c939..37cb2b776435 100644 > --- a/fs/nfs/sysfs.c > +++ b/fs/nfs/sysfs.c > @@ -14,6 +14,7 @@ > #include > #include > =20 > +#include "internal.h" > #include "nfs4_fs.h" > #include "netns.h" > #include "sysfs.h" > @@ -228,6 +229,25 @@ static void shutdown_client(struct rpc_clnt *clnt) > rpc_cancel_tasks(clnt, -EIO, shutdown_match_client, NULL); > } > =20 > +/* > + * Shut down the nfs_client only once all the superblocks > + * have been shut down. > + */ > +static void shutdown_nfs_client(struct nfs_client *clp) > +{ > + struct nfs_server *server; > + rcu_read_lock(); > + list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { > + if (!(server->flags & NFS_MOUNT_SHUTDOWN)) { > + rcu_read_unlock(); > + return; > + } > + } > + rcu_read_unlock(); > + nfs_mark_client_ready(clp, -EIO); > + shutdown_client(clp->cl_rpcclient); > +} > + Isn't the upshot of this that a mount won't actually get shutdown until you shutdown all of the mounts to the same server? Personally, I find that acceptable, but we should note that it is a change in behavior. > static ssize_t > shutdown_show(struct kobject *kobj, struct kobj_attribute *attr, > char *buf) > @@ -259,7 +279,6 @@ shutdown_store(struct kobject *kobj, struct kobj_attr= ibute *attr, > =20 > server->flags |=3D NFS_MOUNT_SHUTDOWN; > shutdown_client(server->client); > - shutdown_client(server->nfs_client->cl_rpcclient); > =20 > if (!IS_ERR(server->client_acl)) > shutdown_client(server->client_acl); > @@ -267,6 +286,7 @@ shutdown_store(struct kobject *kobj, struct kobj_attr= ibute *attr, > if (server->nlm_host) > shutdown_client(server->nlm_host->h_rpcclnt); > out: > + shutdown_nfs_client(server->nfs_client); > return count; > } > =20 --=20 Jeff Layton