1 files changed, 9 insertions, 3 deletions

diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index f91926f2f482..0a926e2ba3ab 100644
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -196,7 +196,7 @@ prototypes:
         void (*invalidatepage) (struct page *, unsigned int, unsigned int);
         int (*releasepage) (struct page *, int);
         void (*freepage)(struct page *);
-        int (*direct_IO)(int, struct kiocb *, struct iov_iter *iter, loff_t offset);
+        int (*direct_IO)(struct kiocb *, struct iov_iter *iter, loff_t offset);
         int (*migratepage)(struct address_space *, struct page *, struct page *);
         int (*launder_page)(struct page *);
         int (*is_partially_uptodate)(struct page *, unsigned long, unsigned long);
@@ -429,8 +429,6 @@ prototypes:
         loff_t (*llseek) (struct file *, loff_t, int);
         ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
         ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
-        ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
-        ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
         ssize_t (*read_iter) (struct kiocb *, struct iov_iter *);
         ssize_t (*write_iter) (struct kiocb *, struct iov_iter *);
         int (*iterate) (struct file *, struct dir_context *);
@@ -525,6 +523,7 @@ prototypes:
         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 *);
         int (*access)(struct vm_area_struct *, unsigned long, void*, int, int);
 
 locking rules:
@@ -534,6 +533,7 @@ close:		yes
 fault:          yes             can return with page locked
 map_pages:      yes
 page_mkwrite:   yes             can return with page locked
+pfn_mkwrite:    yes
 access:         yes
 
         ->fault() is called when a previously not present pte is about
@@ -560,6 +560,12 @@ the page has been truncated, the filesystem should not look up a new page
 like the ->fault() handler, but simply return with VM_FAULT_NOPAGE, which
 will cause the VM to retry the fault.
 
+        ->pfn_mkwrite() is the same as page_mkwrite but when the pte is
+VM_PFNMAP or VM_MIXEDMAP with a page-less entry. Expected return is
+VM_FAULT_NOPAGE. Or one of the VM_FAULT_ERROR types. The default behavior
+after this call is to make the pte read-write, unless pfn_mkwrite returns
+an error.
+
         ->access() is called when get_user_pages() fails in
 access_process_vm(), typically used to debug a process through
 /proc/pid/mem or ptrace.  This function is needed only for