| 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: 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(ptr: fid) ? fid : p9_client_walk(oldfid: fid, nwname: 0, NULL, clone: 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(ptr: 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 | |
|---|
