| 12,6 → 12,54 |
|---|
| /* to align the pointer to the (next) page boundary */ |
| #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) |
| |
| /* |
| * These are the virtual MM functions - opening of an area, closing and |
| * unmapping it (needed to keep files on disk up-to-date etc), pointer |
| * to the functions called when a no-page or a wp-page exception occurs. |
| */ |
| struct vm_operations_struct { |
| void (*open)(struct vm_area_struct * area); |
| void (*close)(struct vm_area_struct * area); |
| int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf); |
| |
| /* notification that a previously read-only page is about to become |
| * writable, if an error is returned it will cause a SIGBUS */ |
| int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf); |
| |
| /* called by access_process_vm when get_user_pages() fails, typically |
| * for use by special VMAs that can switch between memory and hardware |
| */ |
| int (*access)(struct vm_area_struct *vma, unsigned long addr, |
| void *buf, int len, int write); |
| #ifdef CONFIG_NUMA |
| /* |
| * set_policy() op must add a reference to any non-NULL @new mempolicy |
| * to hold the policy upon return. Caller should pass NULL @new to |
| * remove a policy and fall back to surrounding context--i.e. do not |
| * install a MPOL_DEFAULT policy, nor the task or system default |
| * mempolicy. |
| */ |
| int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); |
| |
| /* |
| * get_policy() op must add reference [mpol_get()] to any policy at |
| * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure |
| * in mm/mempolicy.c will do this automatically. |
| * get_policy() must NOT add a ref if the policy at (vma,addr) is not |
| * marked as MPOL_SHARED. vma policies are protected by the mmap_sem. |
| * If no [shared/vma] mempolicy exists at the addr, get_policy() op |
| * must return NULL--i.e., do not "fallback" to task or system default |
| * policy. |
| */ |
| struct mempolicy *(*get_policy)(struct vm_area_struct *vma, |
| unsigned long addr); |
| int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from, |
| const nodemask_t *to, unsigned long flags); |
| #endif |
| /* called by sys_remap_file_pages() to populate non-linear mapping */ |
| int (*remap_pages)(struct vm_area_struct *vma, unsigned long addr, |
| unsigned long size, pgoff_t pgoff); |
| }; |
| #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) |
| |
| #endif |