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![Junxiao Bi](/assets/img/avatar_default.png)
Commit4f6563677a
("Move locks API users to locks_lock_inode_wait()") move flock/posix lock indentify code to locks_lock_inode_wait(), but missed to set fl_flags to FL_FLOCK which caused the following kernel panic on 4.4.0_rc5. kernel BUG at fs/locks.c:1895! invalid opcode: 0000 [#1] SMP Modules linked in: ocfs2(O) ocfs2_dlmfs(O) ocfs2_stack_o2cb(O) ocfs2_dlm(O) ocfs2_nodemanager(O) ocfs2_stackglue(O) iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi xen_kbdfront xen_netfront xen_fbfront xen_blkfront CPU: 0 PID: 20268 Comm: flock_unit_test Tainted: G O 4.4.0-rc5-next-20151217 #1 Hardware name: Xen HVM domU, BIOS 4.3.1OVM 05/14/2014 task: ffff88007b3672c0 ti: ffff880028b58000 task.ti: ffff880028b58000 RIP: locks_lock_inode_wait+0x2e/0x160 Call Trace: ocfs2_do_flock+0x91/0x160 [ocfs2] ocfs2_flock+0x76/0xd0 [ocfs2] SyS_flock+0x10f/0x1a0 entry_SYSCALL_64_fastpath+0x12/0x71 Code: e5 41 57 41 56 49 89 fe 41 55 41 54 53 48 89 f3 48 81 ec 88 00 00 00 8b 46 40 83 e0 03 83 f8 01 0f 84 ad 00 00 00 83 f8 02 74 04 <0f> 0b eb fe 4c 8d ad 60 ff ff ff 4c 8d 7b 58 e8 0e 8e 73 00 4d RIP locks_lock_inode_wait+0x2e/0x160 RSP <ffff880028b5bce8> ---[ end trace dfca74ec9b5b274c ]--- Fixes:4f6563677a
("Move locks API users to locks_lock_inode_wait()") Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com> Cc: Mark Fasheh <mfasheh@suse.de> Cc: Joel Becker <jlbec@evilplan.org> Cc: Joseph Qi <joseph.qi@huawei.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
144 lines
3.4 KiB
C
144 lines
3.4 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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* locks.c
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*
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* Userspace file locking support
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*
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* Copyright (C) 2007 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/fcntl.h>
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "dlmglue.h"
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#include "file.h"
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#include "inode.h"
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#include "locks.h"
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static int ocfs2_do_flock(struct file *file, struct inode *inode,
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int cmd, struct file_lock *fl)
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{
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int ret = 0, level = 0, trylock = 0;
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struct ocfs2_file_private *fp = file->private_data;
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struct ocfs2_lock_res *lockres = &fp->fp_flock;
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if (fl->fl_type == F_WRLCK)
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level = 1;
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if (!IS_SETLKW(cmd))
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trylock = 1;
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mutex_lock(&fp->fp_mutex);
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if (lockres->l_flags & OCFS2_LOCK_ATTACHED &&
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lockres->l_level > LKM_NLMODE) {
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int old_level = 0;
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if (lockres->l_level == LKM_EXMODE)
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old_level = 1;
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if (level == old_level)
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goto out;
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/*
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* Converting an existing lock is not guaranteed to be
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* atomic, so we can get away with simply unlocking
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* here and allowing the lock code to try at the new
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* level.
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*/
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locks_lock_file_wait(file,
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&(struct file_lock) {
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.fl_type = F_UNLCK,
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.fl_flags = FL_FLOCK
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});
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ocfs2_file_unlock(file);
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}
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ret = ocfs2_file_lock(file, level, trylock);
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if (ret) {
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if (ret == -EAGAIN && trylock)
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ret = -EWOULDBLOCK;
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else
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mlog_errno(ret);
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goto out;
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}
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ret = locks_lock_file_wait(file, fl);
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if (ret)
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ocfs2_file_unlock(file);
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out:
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mutex_unlock(&fp->fp_mutex);
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return ret;
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}
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static int ocfs2_do_funlock(struct file *file, int cmd, struct file_lock *fl)
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{
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int ret;
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struct ocfs2_file_private *fp = file->private_data;
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mutex_lock(&fp->fp_mutex);
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ocfs2_file_unlock(file);
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ret = locks_lock_file_wait(file, fl);
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mutex_unlock(&fp->fp_mutex);
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return ret;
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}
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/*
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* Overall flow of ocfs2_flock() was influenced by gfs2_flock().
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*/
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int ocfs2_flock(struct file *file, int cmd, struct file_lock *fl)
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{
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struct inode *inode = file->f_mapping->host;
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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if (!(fl->fl_flags & FL_FLOCK))
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return -ENOLCK;
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if (__mandatory_lock(inode))
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return -ENOLCK;
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if ((osb->s_mount_opt & OCFS2_MOUNT_LOCALFLOCKS) ||
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ocfs2_mount_local(osb))
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return locks_lock_file_wait(file, fl);
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if (fl->fl_type == F_UNLCK)
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return ocfs2_do_funlock(file, cmd, fl);
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else
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return ocfs2_do_flock(file, inode, cmd, fl);
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}
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int ocfs2_lock(struct file *file, int cmd, struct file_lock *fl)
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{
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struct inode *inode = file->f_mapping->host;
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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if (!(fl->fl_flags & FL_POSIX))
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return -ENOLCK;
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if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
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return -ENOLCK;
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return ocfs2_plock(osb->cconn, OCFS2_I(inode)->ip_blkno, file, cmd, fl);
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}
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