Commit dbf4ab44 authored by Dave Jones's avatar Dave Jones Committed by Linus Torvalds

[PATCH] forward ioctls on raw devices to underlying devices

Should allow for things like adjusting readahead on raw devices.
parent 7af03ca1
...@@ -34,6 +34,7 @@ ssize_t raw_write(struct file *, const char *, size_t, loff_t *); ...@@ -34,6 +34,7 @@ ssize_t raw_write(struct file *, const char *, size_t, loff_t *);
int raw_open(struct inode *, struct file *); int raw_open(struct inode *, struct file *);
int raw_release(struct inode *, struct file *); int raw_release(struct inode *, struct file *);
int raw_ctl_ioctl(struct inode *, struct file *, unsigned int, unsigned long); int raw_ctl_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
int raw_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
static struct file_operations raw_fops = { static struct file_operations raw_fops = {
...@@ -41,6 +42,7 @@ static struct file_operations raw_fops = { ...@@ -41,6 +42,7 @@ static struct file_operations raw_fops = {
write: raw_write, write: raw_write,
open: raw_open, open: raw_open,
release: raw_release, release: raw_release,
ioctl: raw_ioctl,
}; };
static struct file_operations raw_ctl_fops = { static struct file_operations raw_ctl_fops = {
...@@ -143,6 +145,25 @@ int raw_release(struct inode *inode, struct file *filp) ...@@ -143,6 +145,25 @@ int raw_release(struct inode *inode, struct file *filp)
/* Forward ioctls to the underlying block device. */
int raw_ioctl(struct inode *inode,
struct file *flip,
unsigned int command,
unsigned long arg)
{
int minor = minor(inode->i_rdev), err;
struct block_device *b;
if (minor < 1 && minor > 255)
return -ENODEV;
b = raw_devices[minor].binding;
err = -EINVAL;
if (b && b->bd_inode && b->bd_op && b->bd_op->ioctl) {
err = b->bd_op->ioctl(b->bd_inode, NULL, command, arg);
}
return err;
}
/* /*
* Deal with ioctls against the raw-device control interface, to bind * Deal with ioctls against the raw-device control interface, to bind
* and unbind other raw devices. * and unbind other raw devices.
......
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