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); 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); 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 } 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 */ 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