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Commit b5710284 authored by Corentin Chary's avatar Corentin Chary Committed by Artem Bityutskiy
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UBI: Add ubi_open_volume_path 



Add an 'ubi_open_volume_path(path, mode)' function which works like
'open_bdev_exclusive(path, mode, ...)' where path is the special file
representing the UBI volume, typically /dev/ubi0_0.

This is needed to teach UBIFS being able to mount UBI character devices.

[Comments and the patch were amended a bit by Artem]

Signed-off-by: default avatarCorentin Chary <corentincj@iksaif.net>
Signed-off-by: default avatarArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
parent 648f4e3e

drivers/mtd/ubi/kapi.c

+40 −0
Original line number Diff line number Diff line
@@ -22,6 +22,8 @@ 


#include <linux/module.h>

#include <linux/err.h>

#include <linux/namei.h>

#include <linux/fs.h>

#include <asm/div64.h>

#include "ubi.h"
@@ -279,6 +281,44 @@ struct ubi_volume_desc *ubi_open_volume_nm(int ubi_num, const char *name, 
}

EXPORT_SYMBOL_GPL(ubi_open_volume_nm);



/**

 * ubi_open_volume_path - open UBI volume by its character device node path.

 * @pathname: volume character device node path

 * @mode: open mode

 *

 * This function is similar to 'ubi_open_volume()', but opens a volume the path

 * to its character device node.

 */

struct ubi_volume_desc *ubi_open_volume_path(const char *pathname, int mode)

{

	int error, ubi_num, vol_id;

	struct ubi_volume_desc *ret;

	struct inode *inode;

	struct path path;



	dbg_gen("open volume %s, mode %d", pathname, mode);



	if (!pathname || !*pathname)

		return ERR_PTR(-EINVAL);



	error = kern_path(pathname, LOOKUP_FOLLOW, &path);

	if (error)

		return ERR_PTR(error);



	inode = path.dentry->d_inode;

	ubi_num = ubi_major2num(imajor(inode));

	vol_id = iminor(inode) - 1;



	if (vol_id >= 0 && ubi_num >= 0)

		ret = ubi_open_volume(ubi_num, vol_id, mode);

	else

		ret = ERR_PTR(-ENODEV);



	path_put(&path);

	return ret;

}

EXPORT_SYMBOL_GPL(ubi_open_volume_path);



/**

 * ubi_close_volume - close UBI volume.

 * @desc: volume descriptor

include/linux/mtd/ubi.h

+2 −0
Original line number Diff line number Diff line
@@ -174,6 +174,8 @@ void ubi_get_volume_info(struct ubi_volume_desc *desc, 
struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode);

struct ubi_volume_desc *ubi_open_volume_nm(int ubi_num, const char *name,

					   int mode);

struct ubi_volume_desc *ubi_open_volume_path(const char *pathname, int mode);



int ubi_register_volume_notifier(struct notifier_block *nb,

				 int ignore_existing);

int ubi_unregister_volume_notifier(struct notifier_block *nb);