[{"id":3680318,"web_url":"http://patchwork.ozlabs.org/comment/3680318/","msgid":"","list_archive_url":null,"date":"2026-04-22T08:36:39","subject":"Re: [PATCH v2] smb: client: allow nolease option to be reconfigured\n on remount","submitter":{"id":86063,"url":"http://patchwork.ozlabs.org/api/people/86063/","name":"Bharath SM","email":"bharathsm.hsk@gmail.com"},"content":"On Tue, Apr 21, 2026 at 10:06 PM wrote:\n>\n> From: Rajasi Mandal \n>\n> tcon->no_lease controls whether the client requests leases from the\n> server. Changing nolease via remount is silently accepted but has\n> no effect because the value is never propagated to the live tcon.\n>\n> Add no_lease to smb3_sync_tcon_opts() so the flag is propagated to\n> every tcon on remount.\n>\n> When switching to nolease, close all deferred file handles via\n> cifs_close_all_deferred_files_sb() outside the tlink_tree_lock,\n> since closing deferred handles can sleep. Deferred handles retain\n> active leases from before the switch; without closing them, those\n> files continue using lease-based caching despite nolease being set.\n>\n> Both transitions are safe:\n> - lease -> nolease: deferred handles are closed, future opens\n> get OPLOCK_LEVEL_NONE.\n> - nolease -> lease: future opens request leases normally.\n>\n> Signed-off-by: Rajasi Mandal \n> ---\n> fs/smb/client/fs_context.c | 9 +++++++++\n> 1 file changed, 9 insertions(+)\n>\n> diff --git a/fs/smb/client/fs_context.c b/fs/smb/client/fs_context.c\n> index 45173f287f00..fb59b45c7f66 100644\n> --- a/fs/smb/client/fs_context.c\n> +++ b/fs/smb/client/fs_context.c\n> @@ -1317,6 +1317,7 @@ static void smb3_sync_tcon_opts(struct cifs_sb_info *cifs_sb,\n>\n> spin_lock(&tcon->tc_lock);\n> tcon->retry = ctx->retry;\n> + tcon->no_lease = ctx->no_lease;\n> /*\n> * Note: this updates the limit for new cached dir opens\n> * but does not resize or evict existing cached dirents.\n> @@ -1325,6 +1326,14 @@ static void smb3_sync_tcon_opts(struct cifs_sb_info *cifs_sb,\n> spin_unlock(&tcon->tc_lock);\n> }\n> spin_unlock(&cifs_sb->tlink_tree_lock);\n> +\n> + /*\n> + * When switching to nolease, close all deferred file handles.\n> + * cifs_close_all_deferred_files_sb() handles its own locking\n> + * and must be called outside tlink_tree_lock since it can sleep.\n> + */\n> + if (ctx->no_lease)\n> + cifs_close_all_deferred_files_sb(cifs_sb);\n> }\nSimilar to deferred files, I think we probably need to invalidate the\ncached directory\nentries when we remount with 'nolease' considering 'nolease' is a\nsuperset mount option\nand should affect all types of leases.\n\nOne additional case to consider: if an application already has a file\nopen with an RWH\nlease acquired before the remount, that handle may continue to hold\nits lease and benefit\nfrom caching until the server sends a lease break or the application\ncloses the handle.\nIs that correct.?\nI think nolease remount only affects new opens; it cannot\nretroactively revoke leases on\nexisting active file handles. It may be worth documenting and/or\ncomment this behavior,\nso it's clear that lease->nolease takes effect gradually as old\nhandles are closed rather than\ninstantaneously across all files & handles.\n\nOther than these comments, change looks good to me.","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-cifs@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=jJbrxe7Y;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; helo=sea.lore.kernel.org;\n envelope-from=linux-cifs+bounces-11003-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com\n header.b=\"jJbrxe7Y\"","smtp.subspace.kernel.org;\n arc=pass smtp.client-ip=74.125.224.53","smtp.subspace.kernel.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=gmail.com"],"Received":["from sea.lore.kernel.org (sea.lore.kernel.org\n [IPv6:2600:3c0a:e001:db::12fc:5321])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g0szz2DV6z1yD5\n\tfor ; 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Wed, 22 Apr 2026\n 01:36:51 -0700 (PDT)","Precedence":"bulk","X-Mailing-List":"linux-cifs@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","References":"<20260409095926.905020-6-rajasimandalos@gmail.com>\n <20260422050613.1136327-1-rajasimandalos@gmail.com>","In-Reply-To":"<20260422050613.1136327-1-rajasimandalos@gmail.com>","From":"Bharath SM ","Date":"Wed, 22 Apr 2026 01:36:39 -0700","X-Gm-Features":"AQROBzB1J1xlyQ4A2gmxrGoYaQW6x9KtQCcCA6aM3iPA77Fw2gthNAmaI-PmcHs","Message-ID":"\n ","Subject":"Re: [PATCH v2] smb: client: allow nolease option to be reconfigured\n on remount","To":"rajasimandalos@gmail.com","Cc":"sfrench@samba.org, linux-cifs@vger.kernel.org,\n\tRajasi Mandal ","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable"}},{"id":3680672,"web_url":"http://patchwork.ozlabs.org/comment/3680672/","msgid":"","list_archive_url":null,"date":"2026-04-22T15:29:12","subject":"Re: [PATCH v2] smb: client: allow nolease option to be reconfigured\n on remount","submitter":{"id":510,"url":"http://patchwork.ozlabs.org/api/people/510/","name":"Steve French","email":"smfrench@gmail.com"},"content":"On Wed, Apr 22, 2026 at 3:37 AM Bharath SM wrote:\n>\n> On Tue, Apr 21, 2026 at 10:06 PM wrote:\n> >\n> > From: Rajasi Mandal \n> >\n> > tcon->no_lease controls whether the client requests leases from the\n> > server. Changing nolease via remount is silently accepted but has\n> > no effect because the value is never propagated to the live tcon.\n> >\n> > Add no_lease to smb3_sync_tcon_opts() so the flag is propagated to\n> > every tcon on remount.\n> >\n> > When switching to nolease, close all deferred file handles via\n> > cifs_close_all_deferred_files_sb() outside the tlink_tree_lock,\n> > since closing deferred handles can sleep. Deferred handles retain\n> > active leases from before the switch; without closing them, those\n> > files continue using lease-based caching despite nolease being set.\n> >\n> > Both transitions are safe:\n> > - lease -> nolease: deferred handles are closed, future opens\n> > get OPLOCK_LEVEL_NONE.\n> > - nolease -> lease: future opens request leases normally.\n> >\n> > Signed-off-by: Rajasi Mandal \n> > ---\n> > fs/smb/client/fs_context.c | 9 +++++++++\n> > 1 file changed, 9 insertions(+)\n> >\n> > diff --git a/fs/smb/client/fs_context.c b/fs/smb/client/fs_context.c\n> > index 45173f287f00..fb59b45c7f66 100644\n> > --- a/fs/smb/client/fs_context.c\n> > +++ b/fs/smb/client/fs_context.c\n> > @@ -1317,6 +1317,7 @@ static void smb3_sync_tcon_opts(struct cifs_sb_info *cifs_sb,\n> >\n> > spin_lock(&tcon->tc_lock);\n> > tcon->retry = ctx->retry;\n> > + tcon->no_lease = ctx->no_lease;\n> > /*\n> > * Note: this updates the limit for new cached dir opens\n> > * but does not resize or evict existing cached dirents.\n> > @@ -1325,6 +1326,14 @@ static void smb3_sync_tcon_opts(struct cifs_sb_info *cifs_sb,\n> > spin_unlock(&tcon->tc_lock);\n> > }\n> > spin_unlock(&cifs_sb->tlink_tree_lock);\n> > +\n> > + /*\n> > + * When switching to nolease, close all deferred file handles.\n> > + * cifs_close_all_deferred_files_sb() handles its own locking\n> > + * and must be called outside tlink_tree_lock since it can sleep.\n> > + */\n> > + if (ctx->no_lease)\n> > + cifs_close_all_deferred_files_sb(cifs_sb);\n> > }\n> Similar to deferred files, I think we probably need to invalidate the\n> cached directory\n> entries when we remount with 'nolease' considering 'nolease' is a\n> superset mount option\n> and should affect all types of leases.\n>\n> One additional case to consider: if an application already has a file\n> open with an RWH\n> lease acquired before the remount, that handle may continue to hold\n> its lease and benefit\n> from caching until the server sends a lease break or the application\n> closes the handle.\n> Is that correct.?\n> I think nolease remount only affects new opens; it cannot\n> retroactively revoke leases on\n> existing active file handles. It may be worth documenting and/or\n> comment this behavior,\n> so it's clear that lease->nolease takes effect gradually as old\n> handles are closed rather than\n> instantaneously across all files & handles.\n>\n> Other than these comments, change looks good to me.\n\nShould those changes be in followon patch rather than adding to this\neasier to understand patch?","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-cifs@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=VJFA1y9D;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; helo=sea.lore.kernel.org;\n envelope-from=linux-cifs+bounces-11011-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com\n header.b=\"VJFA1y9D\"","smtp.subspace.kernel.org;\n arc=pass smtp.client-ip=209.85.219.48","smtp.subspace.kernel.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=gmail.com"],"Received":["from sea.lore.kernel.org (sea.lore.kernel.org\n [IPv6:2600:3c0a:e001:db::12fc:5321])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g13DB15XSz1y2d\n\tfor ; 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