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-rw-r--r--include/linux/mm.h1
-rw-r--r--mm/filemap.c19
-rw-r--r--mm/filemap_xip.c1
3 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index b36d08ce5c57..15987d8e1d59 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1411,6 +1411,7 @@ extern void truncate_inode_pages_range(struct address_space *,
/* generic vm_area_ops exported for stackable file systems */
extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
+extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
/* mm/page-writeback.c */
int write_one_page(struct page *page, int wait);
diff --git a/mm/filemap.c b/mm/filemap.c
index a4a5260b0279..51efee65c2cc 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1712,8 +1712,27 @@ page_not_uptodate:
}
EXPORT_SYMBOL(filemap_fault);
+int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+ struct page *page = vmf->page;
+ struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
+ int ret = VM_FAULT_LOCKED;
+
+ file_update_time(vma->vm_file);
+ lock_page(page);
+ if (page->mapping != inode->i_mapping) {
+ unlock_page(page);
+ ret = VM_FAULT_NOPAGE;
+ goto out;
+ }
+out:
+ return ret;
+}
+EXPORT_SYMBOL(filemap_page_mkwrite);
+
const struct vm_operations_struct generic_file_vm_ops = {
.fault = filemap_fault,
+ .page_mkwrite = filemap_page_mkwrite,
};
/* This is used for a general mmap of a disk file */
diff --git a/mm/filemap_xip.c b/mm/filemap_xip.c
index 213ca1f53409..80b34ef82dfe 100644
--- a/mm/filemap_xip.c
+++ b/mm/filemap_xip.c
@@ -304,6 +304,7 @@ out:
static const struct vm_operations_struct xip_file_vm_ops = {
.fault = xip_file_fault,
+ .page_mkwrite = filemap_page_mkwrite,
};
int xip_file_mmap(struct file * file, struct vm_area_struct * vma)