#define VM_INSERTPAGE 0x02000000 /* The vma has had "vm_insert_page()" done on it */
#define VM_ALWAYSDUMP 0x04000000 /* Always include in core dumps */
-#define VM_CAN_INVALIDATE 0x08000000 /* The mapping may be invalidated,
- * eg. truncate or invalidate_inode_*.
- * In this case, do_no_page must
- * return with the page locked.
- */
-#define VM_CAN_NONLINEAR 0x10000000 /* Has ->fault & does nonlinear pages */
+#define VM_CAN_NONLINEAR 0x08000000 /* Has ->fault & does nonlinear pages */
#ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
#define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
*/
extern pgprot_t protection_map[16];
-#define FAULT_FLAG_WRITE 0x01
-#define FAULT_FLAG_NONLINEAR 0x02
+#define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
+#define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */
+
+
+#define FAULT_RET_NOPAGE 0x0100 /* ->fault did not return a page. This
+ * can be used if the handler installs
+ * their own pte.
+ */
+#define FAULT_RET_LOCKED 0x0200 /* ->fault locked the page, caller must
+ * unlock after installing the mapping.
+ * This is used by pagecache in
+ * particular, where the page lock is
+ * used to synchronise against truncate
+ * and invalidate. Mutually exclusive
+ * with FAULT_RET_NOPAGE.
+ */
/*
- * fault_data is filled in the the pagefault handler and passed to the
- * vma's ->fault function. That function is responsible for filling in
- * 'type', which is the type of fault if a page is returned, or the type
- * of error if NULL is returned.
+ * vm_fault is filled by the the pagefault handler and passed to the vma's
+ * ->fault function. The vma's ->fault is responsible for returning the
+ * VM_FAULT_xxx type which occupies the lowest byte of the return code, ORed
+ * with FAULT_RET_ flags that occupy the next byte and give details about
+ * how the fault was handled.
*
- * pgoff should be used in favour of address, if possible. If pgoff is
- * used, one may set VM_CAN_NONLINEAR in the vma->vm_flags to get
- * nonlinear mapping support.
+ * pgoff should be used in favour of virtual_address, if possible. If pgoff
+ * is used, one may set VM_CAN_NONLINEAR in the vma->vm_flags to get nonlinear
+ * mapping support.
*/
-struct fault_data {
- unsigned long address;
- pgoff_t pgoff;
- unsigned int flags;
- int type;
+struct vm_fault {
+ unsigned int flags; /* FAULT_FLAG_xxx flags */
+ pgoff_t pgoff; /* Logical page offset based on vma */
+ void __user *virtual_address; /* Faulting virtual address */
+
+ struct page *page; /* ->fault handlers should return a
+ * page here, unless FAULT_RET_NOPAGE
+ * is set (which is also implied by
+ * VM_FAULT_OOM or SIGBUS).
+ */
};
/*
struct vm_operations_struct {
void (*open)(struct vm_area_struct * area);
void (*close)(struct vm_area_struct * area);
- struct page *(*fault)(struct vm_area_struct *vma,
- struct fault_data *fdata);
+ int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
struct page *(*nopage)(struct vm_area_struct *area,
unsigned long address, int *type);
unsigned long (*nopfn)(struct vm_area_struct *area,
unsigned long address);
- int (*populate)(struct vm_area_struct *area, unsigned long address,
- unsigned long len, pgprot_t prot, unsigned long pgoff,
- int nonblock);
/* notification that a previously read-only page is about to become
* writable, if an error is returned it will cause a SIGBUS */
* Used to decide whether a process gets delivered SIGBUS or
* just gets major/minor fault counters bumped up.
*/
-#define VM_FAULT_OOM 0x00
-#define VM_FAULT_SIGBUS 0x01
+
+/*
+ * VM_FAULT_ERROR is set for the error cases, to make some tests simpler.
+ */
+#define VM_FAULT_ERROR 0x20
+
+#define VM_FAULT_OOM (0x00 | VM_FAULT_ERROR)
+#define VM_FAULT_SIGBUS (0x01 | VM_FAULT_ERROR)
#define VM_FAULT_MINOR 0x02
#define VM_FAULT_MAJOR 0x03
*/
#define VM_FAULT_WRITE 0x10
+/*
+ * Mask of VM_FAULT_ flags
+ */
+#define VM_FAULT_MASK 0xff
+
#define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
extern void show_free_areas(void);
extern int vmtruncate(struct inode * inode, loff_t offset);
extern int vmtruncate_range(struct inode * inode, loff_t offset, loff_t end);
-extern int install_page(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, struct page *page, pgprot_t prot);
-extern int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, unsigned long pgoff, pgprot_t prot);
#ifdef CONFIG_MMU
extern int __handle_mm_fault(struct mm_struct *mm,struct vm_area_struct *vma,
loff_t lstart, loff_t lend);
/* generic vm_area_ops exported for stackable file systems */
-extern struct page *filemap_fault(struct vm_area_struct *, struct fault_data *);
-extern struct page * __deprecated_for_modules
-filemap_nopage(struct vm_area_struct *, unsigned long, int *);
-extern int __deprecated_for_modules filemap_populate(struct vm_area_struct *,
- unsigned long, unsigned long, pgprot_t, unsigned long, int);
+extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
/* mm/page-writeback.c */
int write_one_page(struct page *page, int wait);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff