mm: move handling of COW faults into DAX code
Move final handling of COW faults from generic code into DAX fault
handler. That way generic code doesn't have to be aware of
peculiarities of DAX locking so remove that knowledge and make locking
functions private to fs/dax.c.
Link: http://lkml.kernel.org/r/1479460644-25076-11-git-send-email-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 60a230e6..59a4da1 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -308,12 +308,6 @@ struct vm_fault {
* is set (which is also implied by
* VM_FAULT_ERROR).
*/
- void *entry; /* ->fault handler can alternatively
- * return locked DAX entry. In that
- * case handler should return
- * VM_FAULT_DAX_LOCKED and fill in
- * entry here.
- */
/* These three entries are valid only while holding ptl lock */
pte_t *pte; /* Pointer to pte entry matching
* the 'address'. NULL if the page
@@ -1104,8 +1098,7 @@ static inline void clear_page_pfmemalloc(struct page *page)
#define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
#define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
#define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
-#define VM_FAULT_DAX_LOCKED 0x1000 /* ->fault has locked DAX entry */
-#define VM_FAULT_DONE_COW 0x2000 /* ->fault has fully handled COW */
+#define VM_FAULT_DONE_COW 0x1000 /* ->fault has fully handled COW */
#define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */