b4caecd480
Since "BDI: Provide backing device capability information [try #3]" the backing_dev_info structure also provides flags for the kind of mmap operation available in a nommu environment, which is entirely unrelated to it's original purpose. Introduce a new nommu-only file operation to provide this information to the nommu mmap code instead. Splitting this from the backing_dev_info structure allows to remove lots of backing_dev_info instance that aren't otherwise needed, and entirely gets rid of the concept of providing a backing_dev_info for a character device. It also removes the need for the mtd_inodefs filesystem. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Tejun Heo <tj@kernel.org> Acked-by: Brian Norris <computersforpeace@gmail.com> Signed-off-by: Jens Axboe <axboe@fb.com>
33 lines
579 B
C
33 lines
579 B
C
#ifndef _LINUX_CDEV_H
|
|
#define _LINUX_CDEV_H
|
|
|
|
#include <linux/kobject.h>
|
|
#include <linux/kdev_t.h>
|
|
#include <linux/list.h>
|
|
|
|
struct file_operations;
|
|
struct inode;
|
|
struct module;
|
|
|
|
struct cdev {
|
|
struct kobject kobj;
|
|
struct module *owner;
|
|
const struct file_operations *ops;
|
|
struct list_head list;
|
|
dev_t dev;
|
|
unsigned int count;
|
|
};
|
|
|
|
void cdev_init(struct cdev *, const struct file_operations *);
|
|
|
|
struct cdev *cdev_alloc(void);
|
|
|
|
void cdev_put(struct cdev *p);
|
|
|
|
int cdev_add(struct cdev *, dev_t, unsigned);
|
|
|
|
void cdev_del(struct cdev *);
|
|
|
|
void cd_forget(struct inode *);
|
|
|
|
#endif
|