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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2010-2019 Junjiro R. Okajima
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*
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* This program, aufs is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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
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* GNU 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 License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* special support for filesystems which acquires an inode mutex
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* at final closing a file, eg, hfsplus.
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*
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* This trick is very simple and stupid, just to open the file before really
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* necessary open to tell hfsplus that this is not the final closing.
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* The caller should call au_h_open_pre() after acquiring the inode mutex,
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* and au_h_open_post() after releasing it.
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*/
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#include "aufs.h"
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struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex,
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int force_wr)
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{
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struct file *h_file;
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struct dentry *h_dentry;
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h_dentry = au_h_dptr(dentry, bindex);
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AuDebugOn(!h_dentry);
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AuDebugOn(d_is_negative(h_dentry));
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h_file = NULL;
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if (au_test_hfsplus(h_dentry->d_sb)
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&& d_is_reg(h_dentry))
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h_file = au_h_open(dentry, bindex,
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O_RDONLY | O_NOATIME | O_LARGEFILE,
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/*file*/NULL, force_wr);
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return h_file;
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}
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void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex,
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struct file *h_file)
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{
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struct au_branch *br;
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if (h_file) {
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fput(h_file);
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br = au_sbr(dentry->d_sb, bindex);
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au_lcnt_dec(&br->br_nfiles);
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}
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}
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