On Thu, Nov 14, 2002 at 07:19:16PM +0530, chandrasekhar.nagaraj wrote:
> Hi,
>
> In one of the part of my driver module , I have a path name to a device file
> (for eg:- /dev/hda1) .Now if I want to obtain the associated major number
> and minor number i.e. device ID(kdev_t) of this file what would be the
> procedure?
I think this should be standard function, I'm sure lots of people are
duplicating this code. For 2.4 kernels:
/*
* Convert a device path to a kdev_t.
*/
static int lookup_device(const char *path, kdev_t *dev)
{
int r;
struct nameidata nd;
struct inode *inode;
if (!path_init(path, LOOKUP_FOLLOW, &nd))
return 0;
if ((r = path_walk(path, &nd)))
goto out;
inode = nd.dentry->d_inode;
if (!inode) {
r = -ENOENT;
goto out;
}
if (!S_ISBLK(inode->i_mode)) {
r = -EINVAL;
goto out;
}
*dev = inode->i_rdev;
out:
path_release(&nd);
return r;
}
-
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This archive was generated by hypermail 2b29 : Fri Nov 15 2002 - 22:00:38 EST