cregit-Linux how code gets into the kernel

Release 4.10 fs/ocfs2/locks.c

Directory: fs/ocfs2
/* -*- 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

PersonTokensPropCommitsCommitProp
mark fashehmark fasheh21393.01%125.00%
wengang wangwengang wang93.93%125.00%
junxiao bijunxiao bi52.18%125.00%
benjamin coddingtonbenjamin coddington20.87%125.00%
Total229100.00%4100.00%


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

PersonTokensPropCommitsCommitProp
mark fashehmark fasheh6398.44%150.00%
benjamin coddingtonbenjamin coddington11.56%150.00%
Total64100.00%2100.00%

/* * 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

PersonTokensPropCommitsCommitProp
mark fashehmark fasheh12099.17%150.00%
benjamin coddingtonbenjamin coddington10.83%150.00%
Total121100.00%2100.00%


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

PersonTokensPropCommitsCommitProp
mark fashehmark fasheh8893.62%150.00%
sachin prabhusachin prabhu66.38%150.00%
Total94100.00%2100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
mark fashehmark fasheh51095.51%233.33%
wengang wangwengang wang91.69%116.67%
sachin prabhusachin prabhu61.12%116.67%
junxiao bijunxiao bi50.94%116.67%
benjamin coddingtonbenjamin coddington40.75%116.67%
Total534100.00%6100.00%
Directory: fs/ocfs2
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