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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* V9FS FID Management
*
* Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com>
*/
#ifndef FS_9P_FID_H
#define FS_9P_FID_H
#include <linux/list.h>
#include "v9fs.h"
struct p9_fid *v9fs_fid_find_inode(struct inode *inode, bool want_writeable,
kuid_t uid, bool any);
struct p9_fid *v9fs_fid_lookup(struct dentry *dentry);
static inline struct p9_fid *v9fs_parent_fid(struct dentry *dentry)
{
return v9fs_fid_lookup(dentry->d_parent);
}
void v9fs_fid_add(struct dentry *dentry, struct p9_fid **fid);
void v9fs_open_fid_add(struct inode *inode, struct p9_fid **fid);
static inline struct p9_fid *clone_fid(struct p9_fid *fid)
{
return IS_ERR(fid) ? fid : p9_client_walk(fid, 0, NULL, 1);
}
static inline struct p9_fid *v9fs_fid_clone(struct dentry *dentry)
{
struct p9_fid *fid, *nfid;
fid = v9fs_fid_lookup(dentry);
if (!fid || IS_ERR(fid))
return fid;
nfid = clone_fid(fid);
p9_fid_put(fid);
return nfid;
}
/**
* v9fs_fid_addmodes - add cache flags to fid mode (for client use only)
* @fid: fid to augment
* @s_flags: session info mount flags
* @s_cache: session info cache flags
* @f_flags: unix open flags
*
* make sure mode reflects flags of underlying mounts
* also qid.version == 0 reflects a synthetic or legacy file system
* NOTE: these are set after open so only reflect 9p client not
* underlying file system on server.
*/
static inline void v9fs_fid_add_modes(struct p9_fid *fid, unsigned int s_flags,
unsigned int s_cache, unsigned int f_flags)
{
if (fid->qid.type != P9_QTFILE)
return;
if ((!s_cache) ||
((fid->qid.version == 0) && !(s_flags & V9FS_IGNORE_QV)) ||
(s_flags & V9FS_DIRECT_IO) || (f_flags & O_DIRECT)) {
fid->mode |= P9L_DIRECT; /* no read or write cache */
} else if ((!(s_cache & CACHE_WRITEBACK)) ||
(f_flags & O_DSYNC) || (s_flags & V9FS_SYNC)) {
fid->mode |= P9L_NOWRITECACHE;
}
}
#endif
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