65 строки
1.9 KiB
C
65 строки
1.9 KiB
C
/* 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 <ericvh@gmail.com>
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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, int s_flags,
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int s_cache, unsigned int f_flags)
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{
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if (fid->qid.type != P9_QTFILE)
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return;
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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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