Function nvm_ctrl_init

src/libnvm/linux_device.cpp:132–185

int nvm_ctrl_init(nvm_ctrl_t** ctrl, int filedes)
{
    int err;
    struct device* dev;
    const struct device_ops ops = {
        .release_device = &release_device,
        .map_range = &ioctl_map,
        .unmap_range = &ioctl_unmap,
    };

    *ctrl = NULL;
    dev = (struct device*) malloc(sizeof(struct device));
    if (dev == NULL)
    {
        dprintf("Failed to allocate device handle: %s\n", strerror(errno));
        return ENOMEM;
    }

    dev->fd = dup(filedes);
    if (dev->fd < 0)
    {
        free(dev);
        dprintf("Could not duplicate file descriptor: %s\n", strerror(errno));
        return errno;
    }

    err = fcntl(dev->fd, F_SETFD, O_RDWR);
    if (err == -1)
    {
        close(dev->fd);
        free(dev);
        dprintf("Failed to set file descriptor control: %s\n", strerror(errno));
        return errno;
    }

    const size_t mm_size = NVM_CTRL_MEM_MINSIZE;
    void* mm_ptr = mmap(NULL, mm_size, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FILE|MAP_LOCKED, dev->fd, 0);
    if (mm_ptr == NULL)
    {
        close(dev->fd);
        free(dev);
        dprintf("Failed to map device memory: %s\n", strerror(errno));
        return errno;
    }

    err = _nvm_ctrl_init(ctrl, dev, &ops, DEVICE_TYPE_IOCTL, mm_ptr, mm_size);
    if (err != 0)
    {
        release_device(dev, mm_ptr, mm_size);
        return err;
    }

    return 0;
}