static int handle_create(const char *nodename, umode_t mode, kuid_t uid,
kgid_t gid, struct device *dev)
{
struct dentry *dentry;
struct path path;
int err;
dentry = kern_path_create(AT_FDCWD, nodename, &path, 0);
if (dentry == ERR_PTR(-ENOENT)) {
create_path(nodename);
dentry = kern_path_create(AT_FDCWD, nodename, &path, 0);
}
if (IS_ERR(dentry))
return PTR_ERR(dentry);
err = vfs_mknod(d_inode(path.dentry), dentry, mode, dev->devt, &path);
if (!err) {
struct iattr newattrs;
newattrs.ia_mode = mode;
newattrs.ia_uid = uid;
newattrs.ia_gid = gid;
newattrs.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID;
mutex_lock(&d_inode(dentry)->i_mutex);
notify_change(dentry, &newattrs, NULL);
mutex_unlock(&d_inode(dentry)->i_mutex);
/* mark as kernel-created inode */
d_inode(dentry)->i_private = &thread;
}
done_path_create(&path, dentry);
return err;
}
static int handle_create(const char *nodename, umode_t mode, struct device *dev)
{
struct dentry *dentry;
struct path path;
int err;
dentry = kern_path_create(AT_FDCWD, nodename, &path, 0);
if (dentry == ERR_PTR(-ENOENT)) {
create_path(nodename);
dentry = kern_path_create(AT_FDCWD, nodename, &path, 0);
}
if (IS_ERR(dentry))
return PTR_ERR(dentry);
err = vfs_mknod(path.dentry->d_inode,
dentry, mode, dev->devt);
if (!err) {
struct iattr newattrs;
/* fixup possibly umasked mode */
newattrs.ia_mode = mode;
newattrs.ia_valid = ATTR_MODE;
mutex_lock(&dentry->d_inode->i_mutex);
notify_change(dentry, &newattrs);
mutex_unlock(&dentry->d_inode->i_mutex);
/* mark as kernel-created inode */
dentry->d_inode->i_private = &thread;
}
done_path_create(&path, dentry);
return err;
}
static int bpf_obj_do_pin(const struct filename *pathname, void *raw,
enum bpf_type type)
{
struct dentry *dentry;
struct inode *dir;
struct path path;
umode_t mode;
dev_t devt;
int ret;
dentry = kern_path_create(AT_FDCWD, pathname->name, &path, 0);
if (IS_ERR(dentry))
return PTR_ERR(dentry);
mode = S_IFREG | ((S_IRUSR | S_IWUSR) & ~current_umask());
devt = MKDEV(UNNAMED_MAJOR, type);
ret = security_path_mknod(&path, dentry, mode, devt);
if (ret)
goto out;
dir = d_inode(path.dentry);
if (dir->i_op != &bpf_dir_iops) {
ret = -EPERM;
goto out;
}
dentry->d_fsdata = raw;
ret = vfs_mknod(dir, dentry, mode, devt);
dentry->d_fsdata = NULL;
out:
done_path_create(&path, dentry);
return ret;
}
static int dev_mkdir(const char *name, umode_t mode)
{
struct dentry *dentry;
struct path path;
int err;
dentry = kern_path_create(AT_FDCWD, name, &path, LOOKUP_DIRECTORY);
if (IS_ERR(dentry))
return PTR_ERR(dentry);
err = vfs_mkdir(path.dentry->d_inode, dentry, mode);
if (!err)
/* mark as kernel-created inode */
dentry->d_inode->i_private = &thread;
done_path_create(&path, dentry);
return err;
}
//====================================================================
// Create a directory for this device under the given path. Returns
// 0 on success and non-zero on failure.
static int create_dev_dir(const char *dev_dir_path) {
struct dentry *dentry;
struct path path;
int lookup_flags = LOOKUP_DIRECTORY;
umode_t mode = S_IRUGO | S_IXUGO;
int err;
dentry = kern_path_create(AT_FDCWD, dev_dir_path, &path, lookup_flags);
if (IS_ERR(dentry)) {
return PTR_ERR(dentry);
}
err = security_path_mkdir(&path, dentry, mode);
if (!err) {
err = vfs_mkdir(path.dentry->d_inode, dentry, mode);
}
done_path_create(&path, dentry);
return err;
}
//====================================================================
// Create a node for this device under the given path using the given
// device number. Returns 0 on success and non-zero on failure.
static int create_fs_node(const char *dev_path, dev_t undelete_minor_devnode) {
struct dentry *dentry;
struct path path;
int lookup_flags = 0;
umode_t mode = S_IRUGO | S_IFCHR;
int err;
dentry = kern_path_create(AT_FDCWD, dev_path, &path, lookup_flags);
if (IS_ERR(dentry)) {
return PTR_ERR(dentry);
}
err = security_path_mknod(&path, dentry, mode, undelete_minor_devnode);
if (!err) {
err = vfs_mknod(path.dentry->d_inode, dentry,
mode, undelete_minor_devnode);
}
done_path_create(&path, dentry);
return err;
}
static int dev_mkdir(const char *name, mode_t mode)
{
struct dentry *dentry;
struct path path;
int err;
dentry = kern_path_create(AT_FDCWD, name, &path, 1);
if (IS_ERR(dentry))
return PTR_ERR(dentry);
err = vfs_mkdir(path.dentry->d_inode, dentry, mode);
if (!err)
/* mark as kernel-created inode */
dentry->d_inode->i_private = &thread;
dput(dentry);
mutex_unlock(&path.dentry->d_inode->i_mutex);
path_put(&path);
return err;
}
int file_mkdir(const char * pathname, unsigned short perms, int recurse) {
/* Welcome to the jungle... */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,41)
/* DO NOT REFERENCE THIS VARIABLE */
/* It only exists to provide version compatibility */
struct path tmp_path;
#endif
struct path * path_ptr = NULL;
struct dentry * dentry;
int ret = 0;
if (recurse != 0) {
return mkdir_recursive(pathname, perms);
}
/* Before Linux 3.1 this was somewhat more difficult */
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,41)
{
struct nameidata nd;
// I'm not 100% sure about the version here, but it was around this time that the API changed
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,38)
ret = kern_path_parent(pathname, &nd);
#else
if (path_lookup(pathname, LOOKUP_DIRECTORY | LOOKUP_FOLLOW, &nd) == 0) {
return 0;
}
if (path_lookup(pathname, LOOKUP_PARENT | LOOKUP_FOLLOW, &nd) != 0) {
return -1;
}
#endif
if (ret != 0) {
printk(KERN_ERR "%s:%d - Error: kern_path_parent() returned error for (%s)\n", __FILE__, __LINE__,
pathname);
return -1;
}
dentry = lookup_create(&nd, 1);
path_ptr = &(nd.path);
}
#else
{
dentry = kern_path_create(AT_FDCWD, pathname, &tmp_path, 1);
if (IS_ERR(dentry)) {
return 0;
}
path_ptr = &tmp_path;
}
#endif
if (!IS_ERR(dentry)) {
ret = vfs_mkdir(path_ptr->dentry->d_inode, dentry, perms);
}
mutex_unlock(&(path_ptr->dentry->d_inode->i_mutex));
path_put(path_ptr);
return ret;
}