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Thread-Topic: [PATCH AUTOSEL for 4.4 106/162] NFSv4: always set NFS_LOCK_LOST when a lock is lost. Thread-Index: AQHTz5nDeGfBMX+iAk+wOuodu2NkjA== Date: Mon, 9 Apr 2018 00:29:04 +0000 Message-ID: <20180409002738.163941-106-alexander.levin@microsoft.com> References: <20180409002738.163941-1-alexander.levin@microsoft.com> In-Reply-To: <20180409002738.163941-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB1110;7:EGgBqr5k+00/7fkJlS78M8zpn8mPg6Rg9tAdmjX9by9H0fDjc7ASxNV8wbqggrrphVz0zjS+X+V8RPKdusS+6lXN/SLDvsFSy/96Q2za4fgxcsfWKoWaUw7Hw395JB9OiHc3Hf4taSCvpsEhk+RJ/t5aDMt6bcfJzHsvzzc9w3RCHY6yQPMgrJWdUZN/j6+n0amQV8vh7cyn6rEUY9a1IDmT1SfojSwyFnOG9Hj6GJW+4SAjtDlNWBD6Oom92NWP;20:rtgfBouUWr8hglpuiPJEI1G82SKohXaRs1hjgeQcGClgK56OQB7+VImFXy+2Gw90aZa3uYUEK2MVwQ0Vbpz8/15knPg+48TZ5M9ytc17mqYywrDdMaVtU/lpk/PDUOZS1N1hlWGESE0C2aZ+UyMyTtPSDKhH2GXqiSdKjm6kdFs= x-ms-office365-filtering-ht: Tenant X-MS-Office365-Filtering-Correlation-Id: d941bc7c-3480-4a7e-360e-08d59db21de0 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB1110; x-ms-traffictypediagnostic: DM5PR2101MB1110: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(28532068793085)(158342451672863)(20558992708506)(89211679590171); x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(8211001083)(61425038)(6040522)(2401047)(5005006)(8121501046)(93006095)(93001095)(3231221)(944501327)(52105095)(3002001)(10201501046)(6055026)(61426038)(61427038)(6041310)(20161123558120)(20161123562045)(20161123560045)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123564045)(6072148)(201708071742011);SRVR:DM5PR2101MB1110;BCL:0;PCL:0;RULEID:;SRVR:DM5PR2101MB1110; x-forefront-prvs: 0637FCE711 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(39860400002)(39380400002)(346002)(396003)(376002)(366004)(199004)(189003)(53936002)(186003)(5250100002)(105586002)(11346002)(99286004)(476003)(66066001)(6512007)(86362001)(575784001)(3660700001)(1076002)(54906003)(68736007)(110136005)(3280700002)(316002)(305945005)(4326008)(107886003)(22452003)(14454004)(7736002)(446003)(6666003)(2501003)(10290500003)(3846002)(6116002)(72206003)(106356001)(25786009)(6486002)(6436002)(8936002)(478600001)(5660300001)(86612001)(8676002)(81156014)(59450400001)(2906002)(102836004)(81166006)(6506007)(2900100001)(76176011)(2616005)(486006)(26005)(36756003)(10090500001)(97736004)(22906009)(217873001);DIR:OUT;SFP:1102;SCL:1;SRVR:DM5PR2101MB1110;H:DM5PR2101MB1032.namprd21.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; x-microsoft-antispam-message-info: yaU1uMrKER4q8Ei/hxFCiZlKUIj/SJrU1yUD5rlzIb9s9+TBPzCiT8zVpmRqkyIzRgFY+BbEJY9Jw6XcVuL+UMHXguPr4sU8dW4bkXpEz8olyQPiWbfKKDpQIqqImLQ40KCR/8SJaUfKcxVbqTgd9xBwePc/L9vKeeE+Y2+mDZF5BeCjpHFTLHpdVL7OBlu3cAF4zXGxSxM1K+Nt+Mx9Y96P/VyWVyGSfw6Ey9gVsU5D/G0eOopYm7YZOLX8akrdu0j3LMGS16ppkp+/V8qzDc4NAmQDbaHpdZAg0DBPOsJ3S6AfYibQyHHWzH/F0ntrE1AE0NUCWKnwqJXmD9AmHAzw6Hx+x41JdGgwjci37EXi0tAMwTSkxxQBYp68z1Ora+SOtPiZlFx75lMURfe0Xskii+FRO9JYf0Szn8+iFr0= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: d941bc7c-3480-4a7e-360e-08d59db21de0 X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Apr 2018 00:29:04.9898 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB1110 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: NeilBrown [ Upstream commit dce2630c7da73b0634686bca557cc8945cc450c8 ] There are 2 comments in the NFSv4 code which suggest that SIGLOST should possibly be sent to a process. In these cases a lock has been lost. The current practice is to set NFS_LOCK_LOST so that read/write returns EIO when a lock is lost. So change these comments to code when sets NFS_LOCK_LOST. One case is when lock recovery after apparent server restart fails with NFS4ERR_DENIED, NFS4ERR_RECLAIM_BAD, or NFS4ERRO_RECLAIM_CONFLICT. The other case is when a lock attempt as part of lease recovery fails with NFS4ERR_DENIED. In an ideal world, these should not happen. However I have a packet trace showing an NFSv4.1 session getting NFS4ERR_BADSESSION after an extended network parition. The NFSv4.1 client treats this like server reboot until/unless it get NFS4ERR_NO_GRACE, in which case it switches over to "nograce" recovery mode. In this network trace, the client attempts to recover a lock and the server (incorrectly) reports NFS4ERR_DENIED rather than NFS4ERR_NO_GRACE. This leads to the ineffective comment and the client then continues to write using the OPEN stateid. Signed-off-by: NeilBrown Signed-off-by: Trond Myklebust Signed-off-by: Sasha Levin --- fs/nfs/nfs4proc.c | 12 ++++++++---- fs/nfs/nfs4state.c | 5 ++++- 2 files changed, 12 insertions(+), 5 deletions(-) diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 8ef6f70c9e25..681b8c217a85 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -1780,7 +1780,7 @@ static int nfs4_open_reclaim(struct nfs4_state_owner = *sp, struct nfs4_state *sta return ret; } =20 -static int nfs4_handle_delegation_recall_error(struct nfs_server *server, = struct nfs4_state *state, const nfs4_stateid *stateid, int err) +static int nfs4_handle_delegation_recall_error(struct nfs_server *server, = struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl= , int err) { switch (err) { default: @@ -1827,7 +1827,11 @@ static int nfs4_handle_delegation_recall_error(struc= t nfs_server *server, struct return -EAGAIN; case -ENOMEM: case -NFS4ERR_DENIED: - /* kill_proc(fl->fl_pid, SIGLOST, 1); */ + if (fl) { + struct nfs4_lock_state *lsp =3D fl->fl_u.nfs4_fl.owner; + if (lsp) + set_bit(NFS_LOCK_LOST, &lsp->ls_flags); + } return 0; } return err; @@ -1863,7 +1867,7 @@ int nfs4_open_delegation_recall(struct nfs_open_conte= xt *ctx, err =3D nfs4_open_recover_helper(opendata, FMODE_READ); } nfs4_opendata_put(opendata); - return nfs4_handle_delegation_recall_error(server, state, stateid, err); + return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, = err); } =20 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldat= a) @@ -6151,7 +6155,7 @@ int nfs4_lock_delegation_recall(struct file_lock *fl,= struct nfs4_state *state, if (err !=3D 0) return err; err =3D _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); - return nfs4_handle_delegation_recall_error(server, state, stateid, err); + return nfs4_handle_delegation_recall_error(server, state, stateid, fl, er= r); } =20 struct nfs_release_lockowner_data { diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c index 9a0b219ff74d..eef49200caa7 100644 --- a/fs/nfs/nfs4state.c +++ b/fs/nfs/nfs4state.c @@ -1386,6 +1386,7 @@ static int nfs4_reclaim_locks(struct nfs4_state *stat= e, const struct nfs4_state_ struct inode *inode =3D state->inode; struct nfs_inode *nfsi =3D NFS_I(inode); struct file_lock *fl; + struct nfs4_lock_state *lsp; int status =3D 0; struct file_lock_context *flctx =3D inode->i_flctx; struct list_head *list; @@ -1426,7 +1427,9 @@ restart: case -NFS4ERR_DENIED: case -NFS4ERR_RECLAIM_BAD: case -NFS4ERR_RECLAIM_CONFLICT: - /* kill_proc(fl->fl_pid, SIGLOST, 1); */ + lsp =3D fl->fl_u.nfs4_fl.owner; + if (lsp) + set_bit(NFS_LOCK_LOST, &lsp->ls_flags); status =3D 0; } spin_lock(&flctx->flc_lock); --=20 2.15.1