1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * V9FS FID Management
 4 *
 5 *  Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com>
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 6 */
 7#ifndef FS_9P_FID_H
 8#define FS_9P_FID_H
 9#include <linux/list.h>
10#include "v9fs.h"
11
12struct p9_fid *v9fs_fid_find_inode(struct inode *inode, bool want_writeable,
13	kuid_t uid, bool any);
14struct p9_fid *v9fs_fid_lookup(struct dentry *dentry);
15static inline struct p9_fid *v9fs_parent_fid(struct dentry *dentry)
16{
17	return v9fs_fid_lookup(dentry->d_parent);
18}
19void v9fs_fid_add(struct dentry *dentry, struct p9_fid **fid);
20void v9fs_open_fid_add(struct inode *inode, struct p9_fid **fid);
21static inline struct p9_fid *clone_fid(struct p9_fid *fid)
22{
23	return IS_ERR(fid) ? fid :  p9_client_walk(fid, 0, NULL, 1);
24}
25static inline struct p9_fid *v9fs_fid_clone(struct dentry *dentry)
26{
27	struct p9_fid *fid, *nfid;
28
29	fid = v9fs_fid_lookup(dentry);
30	if (!fid || IS_ERR(fid))
31		return fid;
32
33	nfid = clone_fid(fid);
34	p9_fid_put(fid);
35	return nfid;
36}
37/**
38 * v9fs_fid_addmodes - add cache flags to fid mode (for client use only)
39 * @fid: fid to augment
40 * @s_flags: session info mount flags
41 * @s_cache: session info cache flags
42 * @f_flags: unix open flags
43 *
44 * make sure mode reflects flags of underlying mounts
45 * also qid.version == 0 reflects a synthetic or legacy file system
46 * NOTE: these are set after open so only reflect 9p client not
47 * underlying file system on server.
48 */
49static inline void v9fs_fid_add_modes(struct p9_fid *fid, unsigned int s_flags,
50	unsigned int s_cache, unsigned int f_flags)
51{
52	if ((!s_cache) ||
53	   ((fid->qid.version == 0) && !(s_flags & V9FS_IGNORE_QV)) ||
54	   (s_flags & V9FS_DIRECT_IO) || (f_flags & O_DIRECT)) {
55		fid->mode |= P9L_DIRECT; /* no read or write cache */
56	} else if ((!(s_cache & CACHE_WRITEBACK)) ||
57				(f_flags & O_DSYNC) || (s_flags & V9FS_SYNC)) {
58		fid->mode |= P9L_NOWRITECACHE;
59	}
60}
61#endif

 
 1/*
 2 * V9FS FID Management
 3 *
 4 *  Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com>
 5 *
 6 *  This program is free software; you can redistribute it and/or modify
 7 *  it under the terms of the GNU General Public License version 2
 8 *  as published by the Free Software Foundation.
 9 *
10 *  This program is distributed in the hope that it will be useful,
11 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
12 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 *  GNU General Public License for more details.
14 *
15 *  You should have received a copy of the GNU General Public License
16 *  along with this program; if not, write to:
17 *  Free Software Foundation
18 *  51 Franklin Street, Fifth Floor
19 *  Boston, MA  02111-1301  USA
20 *
21 */
22#ifndef FS_9P_FID_H
23#define FS_9P_FID_H
24#include <linux/list.h>
 
25
 
 
26struct p9_fid *v9fs_fid_lookup(struct dentry *dentry);
27struct p9_fid *v9fs_fid_clone(struct dentry *dentry);
28void v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid);
29struct p9_fid *v9fs_writeback_fid(struct dentry *dentry);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
30#endif