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4eb3117888
Switch cache modes to a bit-mask and use legacy cache names as shortcuts. Update documentation to include information on both shortcuts and bitmasks. This patch also fixes missing guards related to fscache. Update the documentation for new mount flags and cache modes. Signed-off-by: Eric Van Hensbergen <ericvh@kernel.org>
64 lines
1.9 KiB
C
64 lines
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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