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![Junxiao Bi](/assets/img/avatar_default.png)
While reading block, it is possible that io error return due to underlying storage issue, in this case, BH_NeedsValidate was left in the buffer head. Then when reading the very block next time, if it was already linked into journal, that will trigger the following panic. [203748.702517] kernel BUG at fs/ocfs2/buffer_head_io.c:342! [203748.702533] invalid opcode: 0000 [#1] SMP [203748.702561] Modules linked in: ocfs2 ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm ocfs2_nodemanager ocfs2_stackglue configfs sunrpc dm_switch dm_queue_length dm_multipath bonding be2iscsi iscsi_boot_sysfs bnx2i cnic uio cxgb4i iw_cxgb4 cxgb4 cxgb3i libcxgbi iw_cxgb3 cxgb3 mdio ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr ipv6 iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ipmi_devintf iTCO_wdt iTCO_vendor_support dcdbas ipmi_ssif i2c_core ipmi_si ipmi_msghandler acpi_pad pcspkr sb_edac edac_core lpc_ich mfd_core shpchp sg tg3 ptp pps_core ext4 jbd2 mbcache2 sr_mod cdrom sd_mod ahci libahci megaraid_sas wmi dm_mirror dm_region_hash dm_log dm_mod [203748.703024] CPU: 7 PID: 38369 Comm: touch Not tainted 4.1.12-124.18.6.el6uek.x86_64 #2 [203748.703045] Hardware name: Dell Inc. PowerEdge R620/0PXXHP, BIOS 2.5.2 01/28/2015 [203748.703067] task: ffff880768139c00 ti: ffff88006ff48000 task.ti: ffff88006ff48000 [203748.703088] RIP: 0010:[<ffffffffa05e9f09>] [<ffffffffa05e9f09>] ocfs2_read_blocks+0x669/0x7f0 [ocfs2] [203748.703130] RSP: 0018:ffff88006ff4b818 EFLAGS: 00010206 [203748.703389] RAX: 0000000008620029 RBX: ffff88006ff4b910 RCX: 0000000000000000 [203748.703885] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 00000000023079fe [203748.704382] RBP: ffff88006ff4b8d8 R08: 0000000000000000 R09: ffff8807578c25b0 [203748.704877] R10: 000000000f637376 R11: 000000003030322e R12: 0000000000000000 [203748.705373] R13: ffff88006ff4b910 R14: ffff880732fe38f0 R15: 0000000000000000 [203748.705871] FS: 00007f401992c700(0000) GS:ffff880bfebc0000(0000) knlGS:0000000000000000 [203748.706370] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [203748.706627] CR2: 00007f4019252440 CR3: 00000000a621e000 CR4: 0000000000060670 [203748.707124] Stack: [203748.707371] ffff88006ff4b828 ffffffffa0609f52 ffff88006ff4b838 0000000000000001 [203748.707885] 0000000000000000 0000000000000000 ffff880bf67c3800 ffffffffa05eca00 [203748.708399] 00000000023079ff ffffffff81c58b80 0000000000000000 0000000000000000 [203748.708915] Call Trace: [203748.709175] [<ffffffffa0609f52>] ? ocfs2_inode_cache_io_unlock+0x12/0x20 [ocfs2] [203748.709680] [<ffffffffa05eca00>] ? ocfs2_empty_dir_filldir+0x80/0x80 [ocfs2] [203748.710185] [<ffffffffa05ec0cb>] ocfs2_read_dir_block_direct+0x3b/0x200 [ocfs2] [203748.710691] [<ffffffffa05f0fbf>] ocfs2_prepare_dx_dir_for_insert.isra.57+0x19f/0xf60 [ocfs2] [203748.711204] [<ffffffffa065660f>] ? ocfs2_metadata_cache_io_unlock+0x1f/0x30 [ocfs2] [203748.711716] [<ffffffffa05f4f3a>] ocfs2_prepare_dir_for_insert+0x13a/0x890 [ocfs2] [203748.712227] [<ffffffffa05f442e>] ? ocfs2_check_dir_for_entry+0x8e/0x140 [ocfs2] [203748.712737] [<ffffffffa061b2f2>] ocfs2_mknod+0x4b2/0x1370 [ocfs2] [203748.713003] [<ffffffffa061c385>] ocfs2_create+0x65/0x170 [ocfs2] [203748.713263] [<ffffffff8121714b>] vfs_create+0xdb/0x150 [203748.713518] [<ffffffff8121b225>] do_last+0x815/0x1210 [203748.713772] [<ffffffff812192e9>] ? path_init+0xb9/0x450 [203748.714123] [<ffffffff8121bca0>] path_openat+0x80/0x600 [203748.714378] [<ffffffff811bcd45>] ? handle_pte_fault+0xd15/0x1620 [203748.714634] [<ffffffff8121d7ba>] do_filp_open+0x3a/0xb0 [203748.714888] [<ffffffff8122a767>] ? __alloc_fd+0xa7/0x130 [203748.715143] [<ffffffff81209ffc>] do_sys_open+0x12c/0x220 [203748.715403] [<ffffffff81026ddb>] ? syscall_trace_enter_phase1+0x11b/0x180 [203748.715668] [<ffffffff816f0c9f>] ? system_call_after_swapgs+0xe9/0x190 [203748.715928] [<ffffffff8120a10e>] SyS_open+0x1e/0x20 [203748.716184] [<ffffffff816f0d5e>] system_call_fastpath+0x18/0xd7 [203748.716440] Code: 00 00 48 8b 7b 08 48 83 c3 10 45 89 f8 44 89 e1 44 89 f2 4c 89 ee e8 07 06 11 e1 48 8b 03 48 85 c0 75 df 8b 5d c8 e9 4d fa ff ff <0f> 0b 48 8b 7d a0 e8 dc c6 06 00 48 b8 00 00 00 00 00 00 00 10 [203748.717505] RIP [<ffffffffa05e9f09>] ocfs2_read_blocks+0x669/0x7f0 [ocfs2] [203748.717775] RSP <ffff88006ff4b818> Joesph ever reported a similar panic. Link: https://oss.oracle.com/pipermail/ocfs2-devel/2013-May/008931.html Link: http://lkml.kernel.org/r/20180912063207.29484-1-junxiao.bi@oracle.com Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com> Cc: Joseph Qi <jiangqi903@gmail.com> Cc: Mark Fasheh <mark@fasheh.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Changwei Ge <ge.changwei@h3c.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
440 lines
11 KiB
C
440 lines
11 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* io.c
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*
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* Buffer cache handling
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*
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* Copyright (C) 2002, 2004 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/highmem.h>
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#include <linux/bio.h>
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "alloc.h"
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#include "inode.h"
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#include "journal.h"
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#include "uptodate.h"
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#include "buffer_head_io.h"
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#include "ocfs2_trace.h"
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/*
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* Bits on bh->b_state used by ocfs2.
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*
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* These MUST be after the JBD2 bits. Hence, we use BH_JBDPrivateStart.
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*/
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enum ocfs2_state_bits {
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BH_NeedsValidate = BH_JBDPrivateStart,
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};
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/* Expand the magic b_state functions */
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BUFFER_FNS(NeedsValidate, needs_validate);
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int ocfs2_write_block(struct ocfs2_super *osb, struct buffer_head *bh,
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struct ocfs2_caching_info *ci)
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{
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int ret = 0;
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trace_ocfs2_write_block((unsigned long long)bh->b_blocknr, ci);
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BUG_ON(bh->b_blocknr < OCFS2_SUPER_BLOCK_BLKNO);
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BUG_ON(buffer_jbd(bh));
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/* No need to check for a soft readonly file system here. non
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* journalled writes are only ever done on system files which
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* can get modified during recovery even if read-only. */
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if (ocfs2_is_hard_readonly(osb)) {
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ret = -EROFS;
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mlog_errno(ret);
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goto out;
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}
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ocfs2_metadata_cache_io_lock(ci);
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lock_buffer(bh);
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set_buffer_uptodate(bh);
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/* remove from dirty list before I/O. */
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clear_buffer_dirty(bh);
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get_bh(bh); /* for end_buffer_write_sync() */
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bh->b_end_io = end_buffer_write_sync;
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submit_bh(REQ_OP_WRITE, 0, bh);
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wait_on_buffer(bh);
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if (buffer_uptodate(bh)) {
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ocfs2_set_buffer_uptodate(ci, bh);
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} else {
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/* We don't need to remove the clustered uptodate
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* information for this bh as it's not marked locally
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* uptodate. */
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ret = -EIO;
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mlog_errno(ret);
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}
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ocfs2_metadata_cache_io_unlock(ci);
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out:
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return ret;
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}
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int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
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unsigned int nr, struct buffer_head *bhs[])
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{
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int status = 0;
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unsigned int i;
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struct buffer_head *bh;
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trace_ocfs2_read_blocks_sync((unsigned long long)block, nr);
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if (!nr)
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goto bail;
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for (i = 0 ; i < nr ; i++) {
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if (bhs[i] == NULL) {
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bhs[i] = sb_getblk(osb->sb, block++);
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if (bhs[i] == NULL) {
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status = -ENOMEM;
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mlog_errno(status);
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goto bail;
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}
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}
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bh = bhs[i];
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if (buffer_jbd(bh)) {
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trace_ocfs2_read_blocks_sync_jbd(
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(unsigned long long)bh->b_blocknr);
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continue;
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}
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if (buffer_dirty(bh)) {
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/* This should probably be a BUG, or
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* at least return an error. */
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mlog(ML_ERROR,
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"trying to sync read a dirty "
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"buffer! (blocknr = %llu), skipping\n",
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(unsigned long long)bh->b_blocknr);
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continue;
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}
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lock_buffer(bh);
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if (buffer_jbd(bh)) {
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#ifdef CATCH_BH_JBD_RACES
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mlog(ML_ERROR,
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"block %llu had the JBD bit set "
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"while I was in lock_buffer!",
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(unsigned long long)bh->b_blocknr);
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BUG();
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#else
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unlock_buffer(bh);
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continue;
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#endif
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}
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clear_buffer_uptodate(bh);
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get_bh(bh); /* for end_buffer_read_sync() */
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bh->b_end_io = end_buffer_read_sync;
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submit_bh(REQ_OP_READ, 0, bh);
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}
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for (i = nr; i > 0; i--) {
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bh = bhs[i - 1];
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/* No need to wait on the buffer if it's managed by JBD. */
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if (!buffer_jbd(bh))
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wait_on_buffer(bh);
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if (!buffer_uptodate(bh)) {
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/* Status won't be cleared from here on out,
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* so we can safely record this and loop back
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* to cleanup the other buffers. */
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status = -EIO;
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put_bh(bh);
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bhs[i - 1] = NULL;
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}
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}
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bail:
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return status;
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}
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int ocfs2_read_blocks(struct ocfs2_caching_info *ci, u64 block, int nr,
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struct buffer_head *bhs[], int flags,
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int (*validate)(struct super_block *sb,
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struct buffer_head *bh))
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{
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int status = 0;
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int i, ignore_cache = 0;
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struct buffer_head *bh;
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struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
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trace_ocfs2_read_blocks_begin(ci, (unsigned long long)block, nr, flags);
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BUG_ON(!ci);
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BUG_ON((flags & OCFS2_BH_READAHEAD) &&
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(flags & OCFS2_BH_IGNORE_CACHE));
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if (bhs == NULL) {
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status = -EINVAL;
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mlog_errno(status);
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goto bail;
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}
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if (nr < 0) {
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mlog(ML_ERROR, "asked to read %d blocks!\n", nr);
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status = -EINVAL;
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mlog_errno(status);
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goto bail;
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}
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if (nr == 0) {
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status = 0;
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goto bail;
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}
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ocfs2_metadata_cache_io_lock(ci);
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for (i = 0 ; i < nr ; i++) {
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if (bhs[i] == NULL) {
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bhs[i] = sb_getblk(sb, block++);
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if (bhs[i] == NULL) {
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ocfs2_metadata_cache_io_unlock(ci);
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status = -ENOMEM;
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mlog_errno(status);
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goto bail;
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}
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}
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bh = bhs[i];
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ignore_cache = (flags & OCFS2_BH_IGNORE_CACHE);
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/* There are three read-ahead cases here which we need to
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* be concerned with. All three assume a buffer has
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* previously been submitted with OCFS2_BH_READAHEAD
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* and it hasn't yet completed I/O.
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*
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* 1) The current request is sync to disk. This rarely
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* happens these days, and never when performance
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* matters - the code can just wait on the buffer
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* lock and re-submit.
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*
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* 2) The current request is cached, but not
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* readahead. ocfs2_buffer_uptodate() will return
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* false anyway, so we'll wind up waiting on the
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* buffer lock to do I/O. We re-check the request
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* with after getting the lock to avoid a re-submit.
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*
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* 3) The current request is readahead (and so must
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* also be a caching one). We short circuit if the
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* buffer is locked (under I/O) and if it's in the
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* uptodate cache. The re-check from #2 catches the
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* case that the previous read-ahead completes just
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* before our is-it-in-flight check.
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*/
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if (!ignore_cache && !ocfs2_buffer_uptodate(ci, bh)) {
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trace_ocfs2_read_blocks_from_disk(
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(unsigned long long)bh->b_blocknr,
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(unsigned long long)ocfs2_metadata_cache_owner(ci));
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/* We're using ignore_cache here to say
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* "go to disk" */
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ignore_cache = 1;
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}
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trace_ocfs2_read_blocks_bh((unsigned long long)bh->b_blocknr,
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ignore_cache, buffer_jbd(bh), buffer_dirty(bh));
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if (buffer_jbd(bh)) {
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continue;
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}
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if (ignore_cache) {
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if (buffer_dirty(bh)) {
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/* This should probably be a BUG, or
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* at least return an error. */
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continue;
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}
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/* A read-ahead request was made - if the
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* buffer is already under read-ahead from a
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* previously submitted request than we are
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* done here. */
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if ((flags & OCFS2_BH_READAHEAD)
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&& ocfs2_buffer_read_ahead(ci, bh))
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continue;
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lock_buffer(bh);
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if (buffer_jbd(bh)) {
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#ifdef CATCH_BH_JBD_RACES
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mlog(ML_ERROR, "block %llu had the JBD bit set "
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"while I was in lock_buffer!",
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(unsigned long long)bh->b_blocknr);
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BUG();
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#else
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unlock_buffer(bh);
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continue;
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#endif
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}
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/* Re-check ocfs2_buffer_uptodate() as a
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* previously read-ahead buffer may have
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* completed I/O while we were waiting for the
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* buffer lock. */
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if (!(flags & OCFS2_BH_IGNORE_CACHE)
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&& !(flags & OCFS2_BH_READAHEAD)
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&& ocfs2_buffer_uptodate(ci, bh)) {
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unlock_buffer(bh);
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continue;
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}
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clear_buffer_uptodate(bh);
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get_bh(bh); /* for end_buffer_read_sync() */
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if (validate)
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set_buffer_needs_validate(bh);
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bh->b_end_io = end_buffer_read_sync;
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submit_bh(REQ_OP_READ, 0, bh);
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continue;
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}
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}
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status = 0;
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for (i = (nr - 1); i >= 0; i--) {
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bh = bhs[i];
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if (!(flags & OCFS2_BH_READAHEAD)) {
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if (status) {
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/* Clear the rest of the buffers on error */
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put_bh(bh);
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bhs[i] = NULL;
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continue;
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}
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/* We know this can't have changed as we hold the
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* owner sem. Avoid doing any work on the bh if the
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* journal has it. */
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if (!buffer_jbd(bh))
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wait_on_buffer(bh);
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if (!buffer_uptodate(bh)) {
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/* Status won't be cleared from here on out,
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* so we can safely record this and loop back
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* to cleanup the other buffers. Don't need to
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* remove the clustered uptodate information
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* for this bh as it's not marked locally
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* uptodate. */
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status = -EIO;
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clear_buffer_needs_validate(bh);
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put_bh(bh);
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bhs[i] = NULL;
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continue;
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}
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if (buffer_needs_validate(bh)) {
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/* We never set NeedsValidate if the
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* buffer was held by the journal, so
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* that better not have changed */
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BUG_ON(buffer_jbd(bh));
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clear_buffer_needs_validate(bh);
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status = validate(sb, bh);
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if (status) {
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put_bh(bh);
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bhs[i] = NULL;
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continue;
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}
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}
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}
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/* Always set the buffer in the cache, even if it was
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* a forced read, or read-ahead which hasn't yet
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* completed. */
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ocfs2_set_buffer_uptodate(ci, bh);
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}
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ocfs2_metadata_cache_io_unlock(ci);
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trace_ocfs2_read_blocks_end((unsigned long long)block, nr,
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flags, ignore_cache);
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bail:
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return status;
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}
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/* Check whether the blkno is the super block or one of the backups. */
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static void ocfs2_check_super_or_backup(struct super_block *sb,
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sector_t blkno)
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{
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int i;
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u64 backup_blkno;
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if (blkno == OCFS2_SUPER_BLOCK_BLKNO)
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return;
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for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
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backup_blkno = ocfs2_backup_super_blkno(sb, i);
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if (backup_blkno == blkno)
|
|
return;
|
|
}
|
|
|
|
BUG();
|
|
}
|
|
|
|
/*
|
|
* Write super block and backups doesn't need to collaborate with journal,
|
|
* so we don't need to lock ip_io_mutex and ci doesn't need to bea passed
|
|
* into this function.
|
|
*/
|
|
int ocfs2_write_super_or_backup(struct ocfs2_super *osb,
|
|
struct buffer_head *bh)
|
|
{
|
|
int ret = 0;
|
|
struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
|
|
|
|
BUG_ON(buffer_jbd(bh));
|
|
ocfs2_check_super_or_backup(osb->sb, bh->b_blocknr);
|
|
|
|
if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb)) {
|
|
ret = -EROFS;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
lock_buffer(bh);
|
|
set_buffer_uptodate(bh);
|
|
|
|
/* remove from dirty list before I/O. */
|
|
clear_buffer_dirty(bh);
|
|
|
|
get_bh(bh); /* for end_buffer_write_sync() */
|
|
bh->b_end_io = end_buffer_write_sync;
|
|
ocfs2_compute_meta_ecc(osb->sb, bh->b_data, &di->i_check);
|
|
submit_bh(REQ_OP_WRITE, 0, bh);
|
|
|
|
wait_on_buffer(bh);
|
|
|
|
if (!buffer_uptodate(bh)) {
|
|
ret = -EIO;
|
|
mlog_errno(ret);
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|