Release 4.10 fs/ocfs2/locks.c
/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* locks.c
*
* Userspace file locking support
*
* Copyright (C) 2007 Oracle. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include <linux/fs.h>
#include <linux/fcntl.h>
#include <cluster/masklog.h>
#include "ocfs2.h"
#include "dlmglue.h"
#include "file.h"
#include "inode.h"
#include "locks.h"
static int ocfs2_do_flock(struct file *file, struct inode *inode,
int cmd, struct file_lock *fl)
{
int ret = 0, level = 0, trylock = 0;
struct ocfs2_file_private *fp = file->private_data;
struct ocfs2_lock_res *lockres = &fp->fp_flock;
if (fl->fl_type == F_WRLCK)
level = 1;
if (!IS_SETLKW(cmd))
trylock = 1;
mutex_lock(&fp->fp_mutex);
if (lockres->l_flags & OCFS2_LOCK_ATTACHED &&
lockres->l_level > LKM_NLMODE) {
int old_level = 0;
if (lockres->l_level == LKM_EXMODE)
old_level = 1;
if (level == old_level)
goto out;
/*
* Converting an existing lock is not guaranteed to be
* atomic, so we can get away with simply unlocking
* here and allowing the lock code to try at the new
* level.
*/
locks_lock_file_wait(file,
&(struct file_lock) {
.fl_type = F_UNLCK,
.fl_flags = FL_FLOCK
});
ocfs2_file_unlock(file);
}
ret = ocfs2_file_lock(file, level, trylock);
if (ret) {
if (ret == -EAGAIN && trylock)
ret = -EWOULDBLOCK;
else
mlog_errno(ret);
goto out;
}
ret = locks_lock_file_wait(file, fl);
if (ret)
ocfs2_file_unlock(file);
out:
mutex_unlock(&fp->fp_mutex);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
mark fasheh | mark fasheh | 213 | 93.01% | 1 | 25.00% |
wengang wang | wengang wang | 9 | 3.93% | 1 | 25.00% |
junxiao bi | junxiao bi | 5 | 2.18% | 1 | 25.00% |
benjamin coddington | benjamin coddington | 2 | 0.87% | 1 | 25.00% |
| Total | 229 | 100.00% | 4 | 100.00% |
static int ocfs2_do_funlock(struct file *file, int cmd, struct file_lock *fl)
{
int ret;
struct ocfs2_file_private *fp = file->private_data;
mutex_lock(&fp->fp_mutex);
ocfs2_file_unlock(file);
ret = locks_lock_file_wait(file, fl);
mutex_unlock(&fp->fp_mutex);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
mark fasheh | mark fasheh | 63 | 98.44% | 1 | 50.00% |
benjamin coddington | benjamin coddington | 1 | 1.56% | 1 | 50.00% |
| Total | 64 | 100.00% | 2 | 100.00% |
/*
* Overall flow of ocfs2_flock() was influenced by gfs2_flock().
*/
int ocfs2_flock(struct file *file, int cmd, struct file_lock *fl)
{
struct inode *inode = file->f_mapping->host;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
if (!(fl->fl_flags & FL_FLOCK))
return -ENOLCK;
if (__mandatory_lock(inode))
return -ENOLCK;
if ((osb->s_mount_opt & OCFS2_MOUNT_LOCALFLOCKS) ||
ocfs2_mount_local(osb))
return locks_lock_file_wait(file, fl);
if (fl->fl_type == F_UNLCK)
return ocfs2_do_funlock(file, cmd, fl);
else
return ocfs2_do_flock(file, inode, cmd, fl);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
mark fasheh | mark fasheh | 120 | 99.17% | 1 | 50.00% |
benjamin coddington | benjamin coddington | 1 | 0.83% | 1 | 50.00% |
| Total | 121 | 100.00% | 2 | 100.00% |
int ocfs2_lock(struct file *file, int cmd, struct file_lock *fl)
{
struct inode *inode = file->f_mapping->host;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
if (!(fl->fl_flags & FL_POSIX))
return -ENOLCK;
if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
return -ENOLCK;
return ocfs2_plock(osb->cconn, OCFS2_I(inode)->ip_blkno, file, cmd, fl);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
mark fasheh | mark fasheh | 88 | 93.62% | 1 | 50.00% |
sachin prabhu | sachin prabhu | 6 | 6.38% | 1 | 50.00% |
| Total | 94 | 100.00% | 2 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
mark fasheh | mark fasheh | 510 | 95.51% | 2 | 33.33% |
wengang wang | wengang wang | 9 | 1.69% | 1 | 16.67% |
sachin prabhu | sachin prabhu | 6 | 1.12% | 1 | 16.67% |
junxiao bi | junxiao bi | 5 | 0.94% | 1 | 16.67% |
benjamin coddington | benjamin coddington | 4 | 0.75% | 1 | 16.67% |
| Total | 534 | 100.00% | 6 | 100.00% |
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