static struct dentry *usbdevfs_root_lookup(struct inode *dir, struct dentry *dentry)
{
int busnr;
unsigned long ino = 0;
unsigned int i;
struct inode *inode;
/* sanity check */
if (dir->i_ino != IROOT)
return ERR_PTR(-EINVAL);
dentry->d_op = &usbdevfs_dentry_operations;
busnr = dnumber(dentry);
if (busnr >= 0 && busnr <= 255)
ino = IBUS | (busnr << 8);
if (!ino) {
for (i = 0; i < NRSPECIAL; i++) {
if (strlen(special[i].name) == dentry->d_name.len &&
!strncmp(special[i].name, dentry->d_name.name, dentry->d_name.len)) {
ino = ISPECIAL | (i + IROOT + 1);
break;
}
}
}
if (!ino)
return ERR_PTR(-ENOENT);
inode = iget(dir->i_sb, ino);
if (!inode)
return ERR_PTR(-EINVAL);
if (inode && ITYPE(ino) == IBUS && inode->u.usbdev_i.p.bus == NULL) {
iput(inode);
inode = NULL;
}
d_add(dentry, inode);
return NULL;
}
/* maxn: return the number which has the max divisors */
Big maxn(Divisor *p, int head, int tail)
{
int i, number;
Big max;
max.number = head;
max.sum = dnumber(p, head);
for (i = head + 1; i < tail + 1; i++) {
number = dnumber(p, i);
if (max.sum < number) {
max.sum = number;
max.number = i;
}
}
return max;
}
static struct dentry *usbdevfs_bus_lookup(struct inode *dir, struct dentry *dentry)
{
struct inode *inode;
int devnr;
/* sanity check */
if (ITYPE(dir->i_ino) != IBUS)
return ERR_PTR(-EINVAL);
dentry->d_op = &usbdevfs_dentry_operations;
devnr = dnumber(dentry);
if (devnr < 1 || devnr > 127)
return ERR_PTR(-ENOENT);
inode = iget(dir->i_sb, IDEVICE | (dir->i_ino & (0xff << 8)) | devnr);
if (!inode)
return ERR_PTR(-EINVAL);
if (inode && inode->u.usbdev_i.p.dev == NULL) {
iput(inode);
inode = NULL;
}
d_add(dentry, inode);
return NULL;
}
