Commit d5be7a03 authored Jan 22, 2016 by Ross Zwisler Committed by Linus Torvalds Jan 22, 2016

ext4: call dax_pfn_mkwrite() for DAX fsync/msync

To properly support the new DAX fsync/msync infrastructure filesystems
need to call dax_pfn_mkwrite() so that DAX can track when user pages are
dirtied.

Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jan Kara <jack@suse.com>
Cc: Jeff Layton <jlayton@poochiereds.net>
Cc: Matthew Wilcox <willy@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 80b4adca

fs/ext4/file.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -291,8 +291,8 @@ static int ext4_dax_pfn_mkwrite(struct vm_area_struct *vma,
		{
		struct inode *inode = file_inode(vma->vm_file);
		struct super_block *sb = inode->i_sb;
		int ret = VM_FAULT_NOPAGE;
		loff_t size;
		int ret;

		sb_start_pagefault(sb);
		file_update_time(vma->vm_file);
		@@ -300,6 +300,8 @@ static int ext4_dax_pfn_mkwrite(struct vm_area_struct *vma,
		size = (i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT;
		if (vmf->pgoff >= size)
		ret = VM_FAULT_SIGBUS;
		else
		ret = dax_pfn_mkwrite(vma, vmf);
		up_read(&EXT4_I(inode)->i_mmap_sem);
		sb_end_pagefault(sb);

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