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1/* SPDX-License-Identifier: GPL-2.0-only */2/*3 * V9FS FID Management4 *5 * Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com>6 */7#ifndef FS_9P_FID_H8#define FS_9P_FID_H9#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 augment40 * @s_flags: session info mount flags41 * @s_cache: session info cache flags42 * @f_flags: unix open flags43 *44 * make sure mode reflects flags of underlying mounts45 * also qid.version == 0 reflects a synthetic or legacy file system46 * NOTE: these are set after open so only reflect 9p client not47 * 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#endif62