diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/ocfs2/locks.c')
-rw-r--r-- | ANDROID_3.4.5/fs/ocfs2/locks.c | 139 |
1 files changed, 0 insertions, 139 deletions
diff --git a/ANDROID_3.4.5/fs/ocfs2/locks.c b/ANDROID_3.4.5/fs/ocfs2/locks.c deleted file mode 100644 index e57c8040..00000000 --- a/ANDROID_3.4.5/fs/ocfs2/locks.c +++ /dev/null @@ -1,139 +0,0 @@ -/* -*- 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. - */ - - flock_lock_file_wait(file, - &(struct file_lock){.fl_type = F_UNLCK}); - - 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 = flock_lock_file_wait(file, fl); - -out: - mutex_unlock(&fp->fp_mutex); - - return ret; -} - -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 = flock_lock_file_wait(file, fl); - mutex_unlock(&fp->fp_mutex); - - return ret; -} - -/* - * 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 flock_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); -} - -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); -} |