From 4fcf1c6205fcfc7a226a144ae4d83b7f5415cab8 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Tue, 12 Jun 2012 16:20:29 +0200 Subject: mm: Make default vm_ops provide ->page_mkwrite handler Make default vm_ops provide ->page_mkwrite handler. Currently it only updates file's modification times and gets locked page but later it will also handle filesystem freezing. BugLink: https://bugs.launchpad.net/bugs/897421 Tested-by: Kamal Mostafa Tested-by: Peter M. Petrakis Tested-by: Dann Frazier Tested-by: Massimo Morana Signed-off-by: Jan Kara Signed-off-by: Al Viro --- mm/filemap.c | 19 +++++++++++++++++++ mm/filemap_xip.c | 1 + 2 files changed, 20 insertions(+) (limited to 'mm') 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) -- cgit v1.2.3-59-g8ed1b