Exemplo n.º 1
0
static int sysfs_fill_super(struct super_block *sb, void *data, int silent)
{
	struct inode *inode;
	struct dentry *root;

	sb->s_blocksize = PAGE_CACHE_SIZE;
	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
	sb->s_magic = SYSFS_MAGIC;
	sb->s_op = &sysfs_ops;
	sb->s_time_gran = 1;

	/* get root inode, initialize and unlock it */
	mutex_lock(&sysfs_mutex);
	inode = sysfs_get_inode(sb, &sysfs_root);
	mutex_unlock(&sysfs_mutex);
	if (!inode) {
		pr_debug("sysfs: could not get root inode\n");
		return -ENOMEM;
	}

	/* instantiate and link root dentry */
	root = d_alloc_root(inode);
	if (!root) {
		pr_debug("%s: could not get root dentry!\n",__func__);
		iput(inode);
		return -ENOMEM;
	}
	root->d_fsdata = &sysfs_root;
	sb->s_root = root;
	return 0;
}
Exemplo n.º 2
0
static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry,
				struct nameidata *nd)
{
	struct dentry *ret = NULL;
	struct sysfs_dirent *parent_sd = dentry->d_parent->d_fsdata;
	struct sysfs_dirent *sd;
	struct inode *inode;

	mutex_lock(&sysfs_mutex);

	sd = sysfs_find_dirent(parent_sd, dentry->d_name.name);

	/* no such entry */
	if (!sd) {
		ret = ERR_PTR(-ENOENT);
		goto out_unlock;
	}

	/* attach dentry and inode */
	inode = sysfs_get_inode(dir->i_sb, sd);
	if (!inode) {
		ret = ERR_PTR(-ENOMEM);
		goto out_unlock;
	}

	/* instantiate and hash dentry */
	ret = d_find_alias(inode);
	if (!ret) {
		dentry->d_op = &sysfs_dentry_ops;
		dentry->d_fsdata = sysfs_get(sd);
		d_add(dentry, inode);
	} else {
		d_move(ret, dentry);
		iput(inode);
	}

 out_unlock:
	mutex_unlock(&sysfs_mutex);
	return ret;
}
Exemplo n.º 3
0
static struct dentry *sysfs_lookup(struct inode *dir, struct dentry *dentry,
				   unsigned int flags)
{
	struct dentry *ret = NULL;
	struct dentry *parent = dentry->d_parent;
	struct sysfs_dirent *parent_sd = parent->d_fsdata;
	struct sysfs_dirent *sd;
	struct inode *inode;
	enum kobj_ns_type type;
	const void *ns;

	mutex_lock(&sysfs_mutex);

	type = sysfs_ns_type(parent_sd);
	ns = sysfs_info(dir->i_sb)->ns[type];

	sd = sysfs_find_dirent(parent_sd, dentry->d_name.name, ns);

	/* no such entry */
	if (!sd) {
		ret = ERR_PTR(-ENOENT);
		goto out_unlock;
	}
	dentry->d_fsdata = sysfs_get(sd);

	/* attach dentry and inode */
	inode = sysfs_get_inode(dir->i_sb, sd);
	if (!inode) {
		ret = ERR_PTR(-ENOMEM);
		goto out_unlock;
	}

	/* instantiate and hash dentry */
	ret = d_materialise_unique(dentry, inode);
 out_unlock:
	mutex_unlock(&sysfs_mutex);
	return ret;
}
Exemplo n.º 4
0
Arquivo: dir.c Projeto: cilynx/dd-wrt
static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry,
				struct nameidata *nd)
{
	struct dentry *ret = NULL;
	struct sysfs_dirent * parent_sd = dentry->d_parent->d_fsdata;
	struct sysfs_dirent * sd;
	struct bin_attribute *bin_attr;
	struct inode *inode;
	int found = 0;

	mutex_lock(&sysfs_mutex);

	for (sd = parent_sd->s_children; sd; sd = sd->s_sibling) {
		if (sysfs_type(sd) &&
		    !strcmp(sd->s_name, dentry->d_name.name)) {
			found = 1;
			break;
		}
	}

	/* no such entry */
	if (!found)
		goto out_unlock;

	/* attach dentry and inode */
	inode = sysfs_get_inode(sd);
	if (!inode) {
		ret = ERR_PTR(-ENOMEM);
		goto out_unlock;
	}

	if (inode->i_state & I_NEW) {
		/* initialize inode according to type */
		switch (sysfs_type(sd)) {
		case SYSFS_DIR:
			inode->i_op = &sysfs_dir_inode_operations;
			inode->i_fop = &sysfs_dir_operations;
			inode->i_nlink = sysfs_count_nlink(sd);
			break;
		case SYSFS_KOBJ_ATTR:
			inode->i_size = PAGE_SIZE;
			inode->i_fop = &sysfs_file_operations;
			break;
		case SYSFS_KOBJ_BIN_ATTR:
			bin_attr = sd->s_elem.bin_attr.bin_attr;
			inode->i_size = bin_attr->size;
			inode->i_fop = &bin_fops;
			break;
		case SYSFS_KOBJ_LINK:
			inode->i_op = &sysfs_symlink_inode_operations;
			break;
		default:
			BUG();
		}
	}

	sysfs_instantiate(dentry, inode);
	sysfs_attach_dentry(sd, dentry);

 out_unlock:
	mutex_unlock(&sysfs_mutex);
	return ret;
}