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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/fs/9p/fid.h
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/* SPDX-License-Identifier: GPL-2.0-only */

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/*

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 * V9FS FID Management

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 *

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 *  Copyright (C) 2005 by Eric Van Hensbergen <[email protected]>

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 */

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#ifndef FS_9P_FID_H

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#define FS_9P_FID_H

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#include <linux/list.h>

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#include "v9fs.h"

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struct p9_fid *v9fs_fid_find_inode(struct inode *inode, bool want_writeable,

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	kuid_t uid, bool any);

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struct p9_fid *v9fs_fid_lookup(struct dentry *dentry);

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static inline struct p9_fid *v9fs_parent_fid(struct dentry *dentry)

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{

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	return v9fs_fid_lookup(dentry->d_parent);

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}

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void v9fs_fid_add(struct dentry *dentry, struct p9_fid **fid);

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void v9fs_open_fid_add(struct inode *inode, struct p9_fid **fid);

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static inline struct p9_fid *clone_fid(struct p9_fid *fid)

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{

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	return IS_ERR(fid) ? fid :  p9_client_walk(fid, 0, NULL, 1);

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}

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static inline struct p9_fid *v9fs_fid_clone(struct dentry *dentry)

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{

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	struct p9_fid *fid, *nfid;

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	fid = v9fs_fid_lookup(dentry);

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	if (!fid || IS_ERR(fid))

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		return fid;

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	nfid = clone_fid(fid);

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	p9_fid_put(fid);

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	return nfid;

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}

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/**

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 * v9fs_fid_addmodes - add cache flags to fid mode (for client use only)

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 * @fid: fid to augment

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 * @s_flags: session info mount flags

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 * @s_cache: session info cache flags

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 * @f_flags: unix open flags

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 *

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 * make sure mode reflects flags of underlying mounts

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 * also qid.version == 0 reflects a synthetic or legacy file system

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 * NOTE: these are set after open so only reflect 9p client not

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 * underlying file system on server.

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 */

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static inline void v9fs_fid_add_modes(struct p9_fid *fid, unsigned int s_flags,

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	unsigned int s_cache, unsigned int f_flags)

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{

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	if ((!s_cache) ||

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	   ((fid->qid.version == 0) && !(s_flags & V9FS_IGNORE_QV)) ||

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	   (s_flags & V9FS_DIRECT_IO) || (f_flags & O_DIRECT)) {

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		fid->mode |= P9L_DIRECT; /* no read or write cache */

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	} else if ((!(s_cache & CACHE_WRITEBACK)) ||

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				(f_flags & O_DSYNC) || (s_flags & V9FS_SYNC)) {

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		fid->mode |= P9L_NOWRITECACHE;

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	}

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}

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#endif

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