linux/fs/9p/fid.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * V9FS FID Management
 *
 *  Copyright (C) 2007 by Latchesar Ionkov <[email protected]>
 *  Copyright (C) 2005, 2006 by Eric Van Hensbergen <[email protected]>
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>

#include "v9fs.h"
#include "v9fs_vfs.h"
#include "fid.h"

static inline void __add_fid(struct dentry *dentry, struct p9_fid *fid)
{ … }


/**
 * v9fs_fid_add - add a fid to a dentry
 * @dentry: dentry that the fid is being added to
 * @pfid: fid to add, NULLed out
 *
 */
void v9fs_fid_add(struct dentry *dentry, struct p9_fid **pfid)
{ … }

static bool v9fs_is_writeable(int mode)
{ … }

/**
 * v9fs_fid_find_inode - search for an open fid off of the inode list
 * @inode: return a fid pointing to a specific inode
 * @want_writeable: only consider fids which are writeable
 * @uid: return a fid belonging to the specified user
 * @any: ignore uid as a selection criteria
 *
 */
struct p9_fid *v9fs_fid_find_inode(struct inode *inode, bool want_writeable,
	kuid_t uid, bool any)
{ … }

/**
 * v9fs_open_fid_add - add an open fid to an inode
 * @inode: inode that the fid is being added to
 * @pfid: fid to add, NULLed out
 *
 */

void v9fs_open_fid_add(struct inode *inode, struct p9_fid **pfid)
{ … }


/**
 * v9fs_fid_find - retrieve a fid that belongs to the specified uid
 * @dentry: dentry to look for fid in
 * @uid: return fid that belongs to the specified user
 * @any: if non-zero, return any fid associated with the dentry
 *
 */

static struct p9_fid *v9fs_fid_find(struct dentry *dentry, kuid_t uid, int any)
{ … }

/*
 * We need to hold v9ses->rename_sem as long as we hold references
 * to returned path array. Array element contain pointers to
 * dentry names.
 */
static int build_path_from_dentry(struct v9fs_session_info *v9ses,
				  struct dentry *dentry, const unsigned char ***names)
{ … }

static struct p9_fid *v9fs_fid_lookup_with_uid(struct dentry *dentry,
					       kuid_t uid, int any)
{ … }

/**
 * v9fs_fid_lookup - lookup for a fid, try to walk if not found
 * @dentry: dentry to look for fid in
 *
 * Look for a fid in the specified dentry for the current user.
 * If no fid is found, try to create one walking from a fid from the parent
 * dentry (if it has one), or the root dentry. If the user haven't accessed
 * the fs yet, attach now and walk from the root.
 */

struct p9_fid *v9fs_fid_lookup(struct dentry *dentry)
{ … }