path: root/fs/9p/vfs_inode_dotl.c

/*
 *  linux/fs/9p/vfs_inode_dotl.c
 *
 * This file contains vfs inode ops for the 9P2000.L protocol.
 *
 *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
 *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
 *
 *  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/file.h>
#include <linux/pagemap.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/inet.h>
#include <linux/namei.h>
#include <linux/idr.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/xattr.h>
#include <linux/posix_acl.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>

#include "v9fs.h"
#include "v9fs_vfs.h"
#include "fid.h"
#include "cache.h"
#include "xattr.h"
#include "acl.h"

static int
v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
		    dev_t rdev);

/**
 * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
 * new file system object. This checks the S_ISGID to determine the owning
 * group of the new file system object.
 */

static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
{
	BUG_ON(dir_inode == NULL);

	if (dir_inode->i_mode & S_ISGID) {
		/* set_gid bit is set.*/
		return dir_inode->i_gid;
	}
	return current_fsgid();
}

static int v9fs_test_inode_dotl(struct inode *inode, void *data)
{
	struct v9fs_inode *v9inode = V9FS_I(inode);
	struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;

	/* don't match inode of different type */
	if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
		return 0;

	if (inode->i_generation != st->st_gen)
		return 0;

	/* compare qid details */
	if (memcmp(&v9inode->qid.version,
		   &st->qid.version, sizeof(v9inode->qid.version)))
		return 0;

	if (v9inode->qid.type != st->qid.type)
		return 0;
	return 1;
}

/* Always get a new inode */
static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
{
	return 0;
}

static int v9fs_set_inode_dotl(struct inode *inode,  void *data)
{
	struct v9fs_inode *v9inode = V9FS_I(inode);
	struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;

	memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
	inode->i_generation = st->st_gen;
	return 0;
}

static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
					struct p9_qid *qid,
					struct p9_fid *fid,
					struct p9_stat_dotl *st,
					int new)
{
	int retval;
	unsigned long i_ino;
	struct inode *inode;
	struct v9fs_session_info *v9ses = sb->s_fs_info;
	int (*test)(struct inode *, void *);

	if (new)
		test = v9fs_test_new_inode_dotl;
	else
		test = v9fs_test_inode_dotl;

	i_ino = v9fs_qid2ino(qid);
	inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
	if (!inode)
		return ERR_PTR(-ENOMEM);
	if (!(inode->i_state & I_NEW))
		return inode;
	/*
	 * initialize the inode with the stat info
	 * FIXME!! we may need support for stale inodes
	 * later.
	 */
	inode->i_ino = i_ino;
	retval = v9fs_init_inode(v9ses, inode,
				 st->st_mode, new_decode_dev(st->st_rdev));
	if (retval)
		goto error;

	v9fs_stat2inode_dotl(st, inode);
	v9fs_cache_inode_get_cookie(inode);
	retval = v9fs_get_acl(inode, fid);
	if (retval)
		goto error;

	unlock_new_inode(inode);
	return inode;
error:
	unlock_new_inode(inode);
	iput(inode);
	return ERR_PTR(retval);

}

struct inode *
v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid