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Sun, 8 Apr 2018 20:23:34 -0400 From: Sasha Levin To: "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" CC: Sheng Yong , Jaegeuk Kim , Sasha Levin Subject: [PATCH AUTOSEL for 4.14 058/161] f2fs: avoid hungtask when GC encrypted block if io_bits is set Thread-Topic: [PATCH AUTOSEL for 4.14 058/161] f2fs: avoid hungtask when GC encrypted block if io_bits is set Thread-Index: AQHTz5iTUvE8ADvBCEyJXEsASvbGBQ== Date: Mon, 9 Apr 2018 00:20:33 +0000 Message-ID: <20180409001936.162706-58-alexander.levin@microsoft.com> References: <20180409001936.162706-1-alexander.levin@microsoft.com> In-Reply-To: <20180409001936.162706-1-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;DM5PR2101MB1080;7:Pvz3chK0/67DMa5l/cNEsRH2pttdl53crKufpz0R+Pv+1ggyVC2dS907FcVep3lWXmhGCuov+5N4ivF0eVSBSNnW40Cj6nf1isa4FELBxK4N9RR7tWUjhjPYsg//HodYrvSblS6o/AnJ31t6XijiFXPEbEhpglUB2psSXkctmeFK66PvSVWbxjMJXUWV+oXhtSQ6SSXYA5bN4oRswwCXCKG1iS3vtd8XgJgDPM+qUGBOeGscCyajuUWV95b0x2se;20:EIq+IAHJhaM8AkU8Y6mfETl5Y5yek6eUQm7v2QlWEYNoBVoE90u/QFS36iLa4I/V4cOFIZsP30yPuc8iVaEQIV05/okp62sRCHiJdfyZB/rFA5WC3p2gzF5K+D6ZoscH/ZOIdmcoOH8tU+akEKq8hGBuZ3gKm307RN9eyyDeMFs= x-ms-office365-filtering-ht: Tenant X-MS-Office365-Filtering-Correlation-Id: 99d19d54-9c1c-4e3c-b8fa-08d59db01ff0 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB1080; 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x-microsoft-antispam-message-info: f1HChaQ3W6BcNOfYS0u6Ly0OireBA2fHPRFIGbR5edSE89d2T3sW8ydEHS9eA+SBMBA0kq+HTutj4q05rJMxuXaQx5OzHRHryO7vHFRr0+nz3/I76QPq/BtU+OMjj4GPgdK/lwwz8vFvaj7iVwOjW2jRevH212KuTp4x+F1zlmjDrJztO/IuGFk3SIkV7lDoVeDALfR39wqxeZCUr1PgalkKDE0AoE34J3gvCVBVwo/6xovOGGO1CMzU/Ru8Zu1CV01gv2lgDBr2n4cvJNSxr4s8EphdbMqI/BNTPMWY3lc7vEyBwfZOrdDFdJSYKa5cu0uC4fS+0e/PQoyKSlS9mH/MdIlKn+MPHZcr4osLbgYvkd0vtXeWjXHl5Qu2ZUVfbP+rml/yG7jeHx97D+TZN6I9BbcFEGMl8bUfXdR/WoY= 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: 99d19d54-9c1c-4e3c-b8fa-08d59db01ff0 X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Apr 2018 00:20:33.3943 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB1080 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: Sheng Yong [ Upstream commit a9d572c7550044d5b217b5287d99a2e6d34b97b0 ] When io_bits is set, GCing encrypted block may hit the following hungtask. Since io_bits requires aligned block address, f2fs_submit_page_write may return -EAGAIN if new_blkaddr does not satisify io_bits alignment. As a result, the encrypted page will never be writtenback. This patch makes move_data_block aware the EAGAIN error and cancel the writeback. [ 246.751371] INFO: task kworker/u4:4:797 blocked for more than 90 seconds= . [ 246.752423] Not tainted 4.15.0-rc4+ #11 [ 246.754176] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables = this message. [ 246.755336] kworker/u4:4 D25448 797 2 0x80000000 [ 246.755597] Workqueue: writeback wb_workfn (flush-7:0) [ 246.755616] Call Trace: [ 246.755695] ? __schedule+0x322/0xa90 [ 246.755761] ? blk_init_request_from_bio+0x120/0x120 [ 246.755773] ? pci_mmcfg_check_reserved+0xb0/0xb0 [ 246.755801] ? __radix_tree_create+0x19e/0x200 [ 246.755813] ? delete_node+0x136/0x370 [ 246.755838] schedule+0x43/0xc0 [ 246.755904] io_schedule+0x17/0x40 [ 246.755939] wait_on_page_bit_common+0x17b/0x240 [ 246.755950] ? wake_page_function+0xa0/0xa0 [ 246.755961] ? add_to_page_cache_lru+0x160/0x160 [ 246.755972] ? page_cache_tree_insert+0x170/0x170 [ 246.755983] ? __lru_cache_add+0x96/0xb0 [ 246.756086] __filemap_fdatawait_range+0x14f/0x1c0 [ 246.756097] ? wait_on_page_bit_common+0x240/0x240 [ 246.756120] ? __wake_up_locked_key_bookmark+0x20/0x20 [ 246.756167] ? wait_on_all_pages_writeback+0xc9/0x100 [ 246.756179] ? __remove_ino_entry+0x120/0x120 [ 246.756192] ? wait_woken+0x100/0x100 [ 246.756204] filemap_fdatawait_range+0x9/0x20 [ 246.756216] write_checkpoint+0x18a1/0x1f00 [ 246.756254] ? blk_get_request+0x10/0x10 [ 246.756265] ? cpumask_next_and+0x43/0x60 [ 246.756279] ? f2fs_sync_inode_meta+0x160/0x160 [ 246.756289] ? remove_element.isra.4+0xa0/0xa0 [ 246.756300] ? __put_compound_page+0x40/0x40 [ 246.756310] ? f2fs_sync_fs+0xec/0x1c0 [ 246.756320] ? f2fs_sync_fs+0x120/0x1c0 [ 246.756329] f2fs_sync_fs+0x120/0x1c0 [ 246.756357] ? trace_event_raw_event_f2fs__page+0x260/0x260 [ 246.756393] ? ata_build_rw_tf+0x173/0x410 [ 246.756397] f2fs_balance_fs_bg+0x198/0x390 [ 246.756405] ? drop_inmem_page+0x230/0x230 [ 246.756415] ? ahci_qc_prep+0x1bb/0x2e0 [ 246.756418] ? ahci_qc_issue+0x1df/0x290 [ 246.756422] ? __accumulate_pelt_segments+0x42/0xd0 [ 246.756426] ? f2fs_write_node_pages+0xd1/0x380 [ 246.756429] f2fs_write_node_pages+0xd1/0x380 [ 246.756437] ? sync_node_pages+0x8f0/0x8f0 [ 246.756440] ? update_curr+0x53/0x220 [ 246.756444] ? __accumulate_pelt_segments+0xa2/0xd0 [ 246.756448] ? __update_load_avg_se.isra.39+0x349/0x360 [ 246.756452] ? do_writepages+0x2a/0xa0 [ 246.756456] do_writepages+0x2a/0xa0 [ 246.756460] __writeback_single_inode+0x70/0x490 [ 246.756463] ? check_preempt_wakeup+0x199/0x310 [ 246.756467] writeback_sb_inodes+0x2a2/0x660 [ 246.756471] ? is_empty_dir_inode+0x40/0x40 [ 246.756474] ? __writeback_single_inode+0x490/0x490 [ 246.756477] ? string+0xbf/0xf0 [ 246.756480] ? down_read_trylock+0x35/0x60 [ 246.756484] __writeback_inodes_wb+0x9f/0xf0 [ 246.756488] wb_writeback+0x41d/0x4b0 [ 246.756492] ? writeback_inodes_wb.constprop.55+0x150/0x150 [ 246.756498] ? set_worker_desc+0xf7/0x130 [ 246.756502] ? current_is_workqueue_rescuer+0x60/0x60 [ 246.756511] ? _find_next_bit+0x2c/0xa0 [ 246.756514] ? wb_workfn+0x400/0x5d0 [ 246.756518] wb_workfn+0x400/0x5d0 [ 246.756521] ? finish_task_switch+0xdf/0x2a0 [ 246.756525] ? inode_wait_for_writeback+0x30/0x30 [ 246.756529] process_one_work+0x3a7/0x6f0 [ 246.756533] worker_thread+0x82/0x750 [ 246.756537] kthread+0x16f/0x1c0 [ 246.756541] ? trace_event_raw_event_workqueue_work+0x110/0x110 [ 246.756544] ? kthread_create_worker_on_cpu+0xb0/0xb0 [ 246.756548] ret_from_fork+0x1f/0x30 Signed-off-by: Sheng Yong Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Sasha Levin --- fs/f2fs/gc.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c index bfe6a8ccc3a0..7fb2729d8ee0 100644 --- a/fs/f2fs/gc.c +++ b/fs/f2fs/gc.c @@ -695,7 +695,12 @@ static void move_data_block(struct inode *inode, block= _t bidx, fio.op =3D REQ_OP_WRITE; fio.op_flags =3D REQ_SYNC; fio.new_blkaddr =3D newaddr; - f2fs_submit_page_write(&fio); + err =3D f2fs_submit_page_write(&fio); + if (err) { + if (PageWriteback(fio.encrypted_page)) + end_page_writeback(fio.encrypted_page); + goto put_page_out; + } =20 f2fs_update_iostat(fio.sbi, FS_GC_DATA_IO, F2FS_BLKSIZE); =20 --=20 2.15.1