Commit bf643185 authored by Matias Bjørling's avatar Matias Bjørling Committed by Jens Axboe
Browse files

lightnvm: allow to force mm initialization 



System block allows the device to initialize with its configured media
manager. The system blocks is written to disk, and read again when media
manager is determined. For this to work, the backend must store the
data. Device drivers, such as null_blk, does not have any backend
storage. This patch allows the media manager to be initialized without a
storage backend.

It also fix incorrect configuration of capabilities in null_blk, as it
does not support get/set bad block interface.

Signed-off-by: default avatarMatias Bjørling <m@bjorling.me>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 6dde1d6c

drivers/block/null_blk.c

+1 −1
Original line number Diff line number Diff line
@@ -478,7 +478,7 @@ static int null_lnvm_id(struct nvm_dev *dev, struct nvm_id *id) 
	id->ver_id = 0x1;

	id->vmnt = 0;

	id->cgrps = 1;

	id->cap = 0x3;

	id->cap = 0x2;

	id->dom = 0x1;



	id->ppaf.blk_offset = 0;

drivers/lightnvm/core.c

+16 −9
Original line number Diff line number Diff line
@@ -572,11 +572,13 @@ int nvm_register(struct request_queue *q, char *disk_name, 
		}

	}



	if (dev->identity.cap & NVM_ID_DCAP_BBLKMGMT) {

		ret = nvm_get_sysblock(dev, &dev->sb);

		if (!ret)

			pr_err("nvm: device not initialized.\n");

		else if (ret < 0)

			pr_err("nvm: err (%d) on device initialization\n", ret);

	}



	/* register device with a supported media manager */

	down_write(&nvm_lock);
@@ -1055,9 +1057,11 @@ static long __nvm_ioctl_dev_init(struct nvm_ioctl_dev_init *init) 
	strncpy(info.mmtype, init->mmtype, NVM_MMTYPE_LEN);

	info.fs_ppa.ppa = -1;



	if (dev->identity.cap & NVM_ID_DCAP_BBLKMGMT) {

		ret = nvm_init_sysblock(dev, &info);

		if (ret)

			return ret;

	}



	memcpy(&dev->sb, &info, sizeof(struct nvm_sb_info));
@@ -1117,7 +1121,10 @@ static long nvm_ioctl_dev_factory(struct file *file, void __user *arg) 
		dev->mt = NULL;

	}



	if (dev->identity.cap & NVM_ID_DCAP_BBLKMGMT)

		return nvm_dev_factory(dev, fact.flags);



	return 0;

}



static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)

include/linux/lightnvm.h

+4 −0
Original line number Diff line number Diff line
@@ -135,6 +135,10 @@ enum { 
	/* Memory types */

	NVM_ID_FMTYPE_SLC	= 0,

	NVM_ID_FMTYPE_MLC	= 1,



	/* Device capabilities */

	NVM_ID_DCAP_BBLKMGMT	= 0x1,

	NVM_UD_DCAP_ECC		= 0x2,

};



struct nvm_id_lp_mlc {

CRA Git | Maintained and supported by SUSTech CRA and CCSE