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Commit 55696154 authored by Matias Bjørling's avatar Matias Bjørling Committed by Jens Axboe
Browse files

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: default avatarMatias Bjørling <m@bjorling.me>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent e3eb3799

drivers/lightnvm/core.c

+50 −0
Original line number Diff line number Diff line
@@ -1019,6 +1019,54 @@ static long nvm_ioctl_dev_remove(struct file *file, void __user *arg) 
	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 @@ static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg) 
		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;

}

include/uapi/linux/lightnvm.h

+11 −0
Original line number Diff line number Diff line
@@ -101,6 +101,12 @@ struct nvm_ioctl_remove { 
	__u32 flags;

};



struct nvm_ioctl_dev_init {

	char dev[DISK_NAME_LEN];		/* open-channel SSD device */

	char mmtype[NVM_MMTYPE_LEN];		/* register to media manager */



	__u32 flags;

};



/* The ioctl type, 'L', 0x20 - 0x2F documented in ioctl-number.txt */

enum {
@@ -111,6 +117,9 @@ enum { 
	/* device level cmds */

	NVM_DEV_CREATE_CMD,

	NVM_DEV_REMOVE_CMD,



	/* Init a device to support LightNVM media managers */

	NVM_DEV_INIT_CMD,

};



#define NVM_IOCTL 'L' /* 0x4c */
@@ -123,6 +132,8 @@ enum { 
						struct nvm_ioctl_create)

#define NVM_DEV_REMOVE		_IOW(NVM_IOCTL, NVM_DEV_REMOVE_CMD, \

						struct nvm_ioctl_remove)

#define NVM_DEV_INIT		_IOW(NVM_IOCTL, NVM_DEV_INIT_CMD, \

						struct nvm_ioctl_dev_init)



#define NVM_VERSION_MAJOR	1

#define NVM_VERSION_MINOR	0