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UBI: Add ubi_open_volume_path

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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: Corentin Chary <[email protected]>
Signed-off-by: Artem Bityutskiy <[email protected]>
This commit is contained in:
Corentin Chary 2009-09-28 21:10:11 +02:00 • committed by Artem Bityutskiy
commit b571028418
2 changed files with 42 additions and 0 deletions
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40
drivers/mtd/ubi/kapi.c
View file

@ -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