Messages in this thread | | | Date | Fri, 15 Nov 2002 16:15:36 +0000 | Subject | Re: Path Name to kdev_t | From | Joe Thornber <> |
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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; } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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