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/*
* Copyright (C) 2010-2015 Junjiro R. Okajima
*
* This program, aufs 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, see <http://www.gnu.org/licenses/>.
*/
/*
* special support for filesystems which aqucires an inode mutex
* at final closing a file, eg, hfsplus.
*
* This trick is very simple and stupid, just to open the file before really
* neceeary open to tell hfsplus that this is not the final closing.
* The caller should call au_h_open_pre() after acquiring the inode mutex,
* and au_h_open_post() after releasing it.
*/
#include "aufs.h"
struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex,
int force_wr)
{
struct file *h_file;
struct dentry *h_dentry;
h_dentry = au_h_dptr(dentry, bindex);
AuDebugOn(!h_dentry);
AuDebugOn(d_is_negative(h_dentry));
h_file = NULL;
if (au_test_hfsplus(h_dentry->d_sb)
&& d_is_reg(h_dentry))
h_file = au_h_open(dentry, bindex,
O_RDONLY | O_NOATIME | O_LARGEFILE,
/*file*/NULL, force_wr);
return h_file;
}
void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex,
struct file *h_file)
{
if (h_file) {
fput(h_file);
au_sbr_put(dentry->d_sb, bindex);
}
}
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