//====================================================================
// 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;
}
int vfsub_rename(struct inode *src_dir, struct dentry *src_dentry,
struct inode *dir, struct path *path)
{
int err;
struct path tmp = {
.mnt = path->mnt
};
struct dentry *d;
IMustLock(dir);
IMustLock(src_dir);
d = path->dentry;
path->dentry = d->d_parent;
tmp.dentry = src_dentry->d_parent;
err = security_path_rename(&tmp, src_dentry, path, d);
path->dentry = d;
if (unlikely(err))
goto out;
lockdep_off();
err = vfs_rename(src_dir, src_dentry, dir, path->dentry);
lockdep_on();
if (!err) {
int did;
tmp.dentry = d->d_parent;
vfsub_update_h_iattr(&tmp, &did);
if (did) {
tmp.dentry = src_dentry;
vfsub_update_h_iattr(&tmp, /*did*/NULL);
tmp.dentry = src_dentry->d_parent;
vfsub_update_h_iattr(&tmp, /*did*/NULL);
}
/*ignore*/
}
out:
return err;
}
int vfsub_mkdir(struct inode *dir, struct path *path, int mode)
{
int err;
struct dentry *d;
IMustLock(dir);
d = path->dentry;
path->dentry = d->d_parent;
err = security_path_mkdir(path, d, mode);
path->dentry = d;
if (unlikely(err))
goto out;
err = vfs_mkdir(dir, path->dentry, mode);
if (!err) {
struct path tmp = *path;
int did;
vfsub_update_h_iattr(&tmp, &did);
if (did) {
tmp.dentry = path->dentry->d_parent;
vfsub_update_h_iattr(&tmp, /*did*/NULL);
}
/*ignore*/
}
out:
return err;
}