130 lines
3.1 KiB
C
130 lines
3.1 KiB
C
/*
|
|
* V9FS FID Management
|
|
*
|
|
* Copyright (C) 2005, 2006 by Eric Van Hensbergen <ericvh@gmail.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to:
|
|
* Free Software Foundation
|
|
* 51 Franklin Street, Fifth Floor
|
|
* Boston, MA 02111-1301 USA
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/idr.h>
|
|
|
|
#include "debug.h"
|
|
#include "v9fs.h"
|
|
#include "9p.h"
|
|
#include "v9fs_vfs.h"
|
|
#include "fid.h"
|
|
|
|
/**
|
|
* v9fs_fid_insert - add a fid to a dentry
|
|
* @fid: fid to add
|
|
* @dentry: dentry that it is being added to
|
|
*
|
|
*/
|
|
|
|
int v9fs_fid_insert(struct v9fs_fid *fid, struct dentry *dentry)
|
|
{
|
|
struct list_head *fid_list = (struct list_head *)dentry->d_fsdata;
|
|
dprintk(DEBUG_9P, "fid %d (%p) dentry %s (%p)\n", fid->fid, fid,
|
|
dentry->d_iname, dentry);
|
|
if (dentry->d_fsdata == NULL) {
|
|
dentry->d_fsdata =
|
|
kmalloc(sizeof(struct list_head), GFP_KERNEL);
|
|
if (dentry->d_fsdata == NULL) {
|
|
dprintk(DEBUG_ERROR, "Out of memory\n");
|
|
return -ENOMEM;
|
|
}
|
|
fid_list = (struct list_head *)dentry->d_fsdata;
|
|
INIT_LIST_HEAD(fid_list); /* Initialize list head */
|
|
}
|
|
|
|
fid->uid = current->uid;
|
|
list_add(&fid->list, fid_list);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* v9fs_fid_create - allocate a FID structure
|
|
* @dentry - dentry to link newly created fid to
|
|
*
|
|
*/
|
|
|
|
struct v9fs_fid *v9fs_fid_create(struct v9fs_session_info *v9ses, int fid)
|
|
{
|
|
struct v9fs_fid *new;
|
|
|
|
dprintk(DEBUG_9P, "fid create fid %d\n", fid);
|
|
new = kmalloc(sizeof(struct v9fs_fid), GFP_KERNEL);
|
|
if (new == NULL) {
|
|
dprintk(DEBUG_ERROR, "Out of Memory\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
new->fid = fid;
|
|
new->v9ses = v9ses;
|
|
new->fidopen = 0;
|
|
new->fidclunked = 0;
|
|
new->iounit = 0;
|
|
new->rdir_pos = 0;
|
|
new->rdir_fcall = NULL;
|
|
INIT_LIST_HEAD(&new->list);
|
|
|
|
return new;
|
|
}
|
|
|
|
/**
|
|
* v9fs_fid_destroy - deallocate a FID structure
|
|
* @fid: fid to destroy
|
|
*
|
|
*/
|
|
|
|
void v9fs_fid_destroy(struct v9fs_fid *fid)
|
|
{
|
|
list_del(&fid->list);
|
|
kfree(fid);
|
|
}
|
|
|
|
/**
|
|
* v9fs_fid_lookup - retrieve the right fid from a particular dentry
|
|
* @dentry: dentry to look for fid in
|
|
* @type: intent of lookup (operation or traversal)
|
|
*
|
|
* find a fid in the dentry
|
|
*
|
|
* TODO: only match fids that have the same uid as current user
|
|
*
|
|
*/
|
|
|
|
struct v9fs_fid *v9fs_fid_lookup(struct dentry *dentry)
|
|
{
|
|
struct list_head *fid_list = (struct list_head *)dentry->d_fsdata;
|
|
struct v9fs_fid *return_fid = NULL;
|
|
|
|
dprintk(DEBUG_9P, " dentry: %s (%p)\n", dentry->d_iname, dentry);
|
|
|
|
if (fid_list)
|
|
return_fid = list_entry(fid_list->next, struct v9fs_fid, list);
|
|
|
|
if (!return_fid) {
|
|
dprintk(DEBUG_ERROR, "Couldn't find a fid in dentry\n");
|
|
}
|
|
|
|
return return_fid;
|
|
}
|