Fix NUMA Memory Policy Reference Counting

[sfrench/cifs-2.6.git] / mm / filemap_xip.c

diff --git a/mm/filemap_xip.c b/mm/filemap_xip.c
index cbb335813ec01509ccf0b5525ccb1a3e0f51e1cc..53ee6a299635bb4c07aa3d5200a861d5d78e8c5d 100644 (file)
--- a/mm/filemap_xip.c
+++ b/mm/filemap_xip.c
@@ -13,6 +13,7 @@
 #include <linux/module.h>
 #include <linux/uio.h>
 #include <linux/rmap.h>
+#include <linux/sched.h>
 #include <asm/tlbflush.h>
 #include "filemap.h"
 
@@ -158,28 +159,6 @@ xip_file_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos)
 }
 EXPORT_SYMBOL_GPL(xip_file_read);
 
-ssize_t
-xip_file_sendfile(struct file *in_file, loff_t *ppos,
-            size_t count, read_actor_t actor, void *target)
-{
-       read_descriptor_t desc;
-
-       if (!count)
-               return 0;
-
-       desc.written = 0;
-       desc.count = count;
-       desc.arg.data = target;
-       desc.error = 0;
-
-       do_xip_mapping_read(in_file->f_mapping, &in_file->f_ra, in_file,
-                           ppos, &desc, actor);
-       if (desc.written)
-               return desc.written;
-       return desc.error;
-}
-EXPORT_SYMBOL_GPL(xip_file_sendfile);
-
 /*
  * __xip_unmap is invoked from xip_unmap and
  * xip_write
@@ -226,62 +205,58 @@ __xip_unmap (struct address_space * mapping,
 }
 
 /*
- * xip_nopage() is invoked via the vma operations vector for a
+ * xip_fault() is invoked via the vma operations vector for a
  * mapped memory region to read in file data during a page fault.
  *
- * This function is derived from filemap_nopage, but used for execute in place
+ * This function is derived from filemap_fault, but used for execute in place
  */
-static struct page *
-xip_file_nopage(struct vm_area_struct * area,
-                  unsigned long address,
-                  int *type)
+static int xip_file_fault(struct vm_area_struct *area, struct vm_fault *vmf)
 {
        struct file *file = area->vm_file;
        struct address_space *mapping = file->f_mapping;
        struct inode *inode = mapping->host;
        struct page *page;
-       unsigned long size, pgoff, endoff;
+       pgoff_t size;
 
-       pgoff = ((address - area->vm_start) >> PAGE_CACHE_SHIFT)
-               + area->vm_pgoff;
-       endoff = ((area->vm_end - area->vm_start) >> PAGE_CACHE_SHIFT)
-               + area->vm_pgoff;
+       /* XXX: are VM_FAULT_ codes OK? */
 
        size = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
-       if (pgoff >= size)
-               return NOPAGE_SIGBUS;
+       if (vmf->pgoff >= size)
+               return VM_FAULT_SIGBUS;
 
-       page = mapping->a_ops->get_xip_page(mapping, pgoff*(PAGE_SIZE/512), 0);
+       page = mapping->a_ops->get_xip_page(mapping,
+                                       vmf->pgoff*(PAGE_SIZE/512), 0);
        if (!IS_ERR(page))
                goto out;
        if (PTR_ERR(page) != -ENODATA)
-               return NOPAGE_SIGBUS;
+               return VM_FAULT_OOM;
 
        /* sparse block */
        if ((area->vm_flags & (VM_WRITE | VM_MAYWRITE)) &&
            (area->vm_flags & (VM_SHARED| VM_MAYSHARE)) &&
            (!(mapping->host->i_sb->s_flags & MS_RDONLY))) {
                /* maybe shared writable, allocate new block */
-               page = mapping->a_ops->get_xip_page (mapping,
-                       pgoff*(PAGE_SIZE/512), 1);
+               page = mapping->a_ops->get_xip_page(mapping,
+                                       vmf->pgoff*(PAGE_SIZE/512), 1);
                if (IS_ERR(page))
-                       return NOPAGE_SIGBUS;
+                       return VM_FAULT_SIGBUS;
                /* unmap page at pgoff from all other vmas */
-               __xip_unmap(mapping, pgoff);
+               __xip_unmap(mapping, vmf->pgoff);
        } else {
                /* not shared and writable, use xip_sparse_page() */
                page = xip_sparse_page();
                if (!page)
-                       return NOPAGE_OOM;
+                       return VM_FAULT_OOM;
        }
 
 out:
        page_cache_get(page);
-       return page;
+       vmf->page = page;
+       return 0;
 }
 
 static struct vm_operations_struct xip_file_vm_ops = {
-       .nopage         = xip_file_nopage,
+       .fault  = xip_file_fault,
 };
 
 int xip_file_mmap(struct file * file, struct vm_area_struct * vma)
@@ -290,6 +265,7 @@ int xip_file_mmap(struct file * file, struct vm_area_struct * vma)
 
        file_accessed(file);
        vma->vm_ops = &xip_file_vm_ops;
+       vma->vm_flags |= VM_CAN_NONLINEAR;
        return 0;
 }
 EXPORT_SYMBOL_GPL(xip_file_mmap);
@@ -434,7 +410,6 @@ xip_truncate_page(struct address_space *mapping, loff_t from)
        unsigned blocksize;
        unsigned length;
        struct page *page;
-       void *kaddr;
 
        BUG_ON(!mapping->a_ops->get_xip_page);
 
@@ -458,11 +433,7 @@ xip_truncate_page(struct address_space *mapping, loff_t from)
                else
                        return PTR_ERR(page);
        }
-       kaddr = kmap_atomic(page, KM_USER0);
-       memset(kaddr + offset, 0, length);
-       kunmap_atomic(kaddr, KM_USER0);
-
-       flush_dcache_page(page);
+       zero_user_page(page, offset, length, KM_USER0);
        return 0;
 }
 EXPORT_SYMBOL_GPL(xip_truncate_page);