From 41c4d25f78c01ede13efee1f2e979f3f35dd26f6 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Tue, 12 Jun 2012 16:20:28 +0200 Subject: [PATCH] mm: Update file times from fault path only if .page_mkwrite is not set Filesystems wanting to properly support freezing need to have control when file_update_time() is called. After pushing file_update_time() to all relevant .page_mkwrite implementations we can just stop calling file_update_time() when filesystem implements .page_mkwrite. 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/memory.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/mm/memory.c b/mm/memory.c index 2466d1250231..7c7fa7b4b6b6 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2638,6 +2638,9 @@ reuse: if (!page_mkwrite) { wait_on_page_locked(dirty_page); set_page_dirty_balance(dirty_page, page_mkwrite); + /* file_update_time outside page_lock */ + if (vma->vm_file) + file_update_time(vma->vm_file); } put_page(dirty_page); if (page_mkwrite) { @@ -2655,10 +2658,6 @@ reuse: } } - /* file_update_time outside page_lock */ - if (vma->vm_file) - file_update_time(vma->vm_file); - return ret; } @@ -3327,12 +3326,13 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma, if (dirty_page) { struct address_space *mapping = page->mapping; + int dirtied = 0; if (set_page_dirty(dirty_page)) - page_mkwrite = 1; + dirtied = 1; unlock_page(dirty_page); put_page(dirty_page); - if (page_mkwrite && mapping) { + if ((dirtied || page_mkwrite) && mapping) { /* * Some device drivers do not set page.mapping but still * dirty their pages @@ -3341,7 +3341,7 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma, } /* file_update_time outside page_lock */ - if (vma->vm_file) + if (vma->vm_file && !page_mkwrite) file_update_time(vma->vm_file); } else { unlock_page(vmf.page); -- 2.20.1