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
12 struct p9_fid *v9fs_fid_find_inode(struct inode *inode, bool want_writeable,
13 kuid_t uid, bool any);
14 struct p9_fid *v9fs_fid_lookup(struct dentry *dentry);
v9fs_parent_fid(struct dentry * dentry)15 static inline struct p9_fid *v9fs_parent_fid(struct dentry *dentry)
16 {
17 return v9fs_fid_lookup(dentry->d_parent);
18 }
19 void v9fs_fid_add(struct dentry *dentry, struct p9_fid **fid);
20 void v9fs_open_fid_add(struct inode *inode, struct p9_fid **fid);
clone_fid(struct p9_fid * fid)21 static 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 }
v9fs_fid_clone(struct dentry * dentry)25 static 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 */
v9fs_fid_add_modes(struct p9_fid * fid,unsigned int s_flags,unsigned int s_cache,unsigned int f_flags)49 static 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 (fid->qid.type != P9_QTFILE)
53 return;
54
55 if ((!s_cache) ||
56 ((fid->qid.version == 0) && !(s_flags & V9FS_IGNORE_QV)) ||
57 (s_flags & V9FS_DIRECT_IO) || (f_flags & O_DIRECT)) {
58 fid->mode |= P9L_DIRECT; /* no read or write cache */
59 } else if ((!(s_cache & CACHE_WRITEBACK)) ||
60 (f_flags & O_DSYNC) || (s_flags & V9FS_SYNC)) {
61 fid->mode |= P9L_NOWRITECACHE;
62 }
63 }
64 #endif
65
