prototypes:
void (*open)(struct vm_area_struct*);
void (*close)(struct vm_area_struct*);
- int (*fault)(struct vm_area_struct*, struct vm_fault *);
- int (*page_mkwrite)(struct vm_area_struct *, struct vm_fault *);
- int (*pfn_mkwrite)(struct vm_area_struct *, struct vm_fault *);
+ vm_fault_t (*fault)(struct vm_area_struct*, struct vm_fault *);
+ vm_fault_t (*page_mkwrite)(struct vm_area_struct *, struct vm_fault *);
+ vm_fault_t (*pfn_mkwrite)(struct vm_area_struct *, struct vm_fault *);
int (*access)(struct vm_area_struct *, unsigned long, void*, int, int);
locking rules: