lightnvm: introduce ioctl to initialize device
Based on the previous patch, we now introduce an ioctl to initialize the
device using nvm_init_sysblock and create the necessary system blocks.
The user may specify the media manager that they wish to instantiate on
top. Default from user-space will be "gennvm".
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 73b8ae1..ee08fac 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -1019,6 +1019,54 @@
return __nvm_configure_remove(&remove);
}
+static void nvm_setup_nvm_sb_info(struct nvm_sb_info *info)
+{
+ info->seqnr = 1;
+ info->erase_cnt = 0;
+ info->version = 1;
+}
+
+static long __nvm_ioctl_dev_init(struct nvm_ioctl_dev_init *init)
+{
+ struct nvm_dev *dev;
+ struct nvm_sb_info info;
+
+ down_write(&nvm_lock);
+ dev = nvm_find_nvm_dev(init->dev);
+ up_write(&nvm_lock);
+ if (!dev) {
+ pr_err("nvm: device not found\n");
+ return -EINVAL;
+ }
+
+ nvm_setup_nvm_sb_info(&info);
+
+ strncpy(info.mmtype, init->mmtype, NVM_MMTYPE_LEN);
+ info.fs_ppa.ppa = -1;
+
+ return nvm_init_sysblock(dev, &info);
+}
+
+static long nvm_ioctl_dev_init(struct file *file, void __user *arg)
+{
+ struct nvm_ioctl_dev_init init;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (copy_from_user(&init, arg, sizeof(struct nvm_ioctl_dev_init)))
+ return -EFAULT;
+
+ if (init.flags != 0) {
+ pr_err("nvm: no flags supported\n");
+ return -EINVAL;
+ }
+
+ init.dev[DISK_NAME_LEN - 1] = '\0';
+
+ return __nvm_ioctl_dev_init(&init);
+}
+
static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
{
void __user *argp = (void __user *)arg;
@@ -1032,6 +1080,8 @@
return nvm_ioctl_dev_create(file, argp);
case NVM_DEV_REMOVE:
return nvm_ioctl_dev_remove(file, argp);
+ case NVM_DEV_INIT:
+ return nvm_ioctl_dev_init(file, argp);
}
return 0;
}