From 7b565c9f965bac269cc6a1f25c819f77044abf9d Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@suse.cz>
Date: Wed, 1 Nov 2017 16:36:46 +0100
Subject: [PATCH 18/20] xfs: Implement xfs_filemap_pfn_mkwrite() using
 __xfs_filemap_fault()
Git-commit: 7b565c9f965bac269cc6a1f25c819f77044abf9d
Patch-mainline: v4.15-rc1
References: fate#322879

xfs_filemap_pfn_mkwrite() duplicates a lot of __xfs_filemap_fault().
It will also need to handle flushing for synchronous page faults. So
just make that function use __xfs_filemap_fault().

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Jan Kara <jack@suse.cz>

---
 fs/xfs/xfs_file.c  | 29 ++++-------------------------
 fs/xfs/xfs_trace.h |  2 --
 2 files changed, 4 insertions(+), 27 deletions(-)

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 7c6b8def6eed..4496b45678de 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1085,37 +1085,16 @@ xfs_filemap_page_mkwrite(
 }
 
 /*
- * pfn_mkwrite was originally inteneded to ensure we capture time stamp
- * updates on write faults. In reality, it's need to serialise against
- * truncate similar to page_mkwrite. Hence we cycle the XFS_MMAPLOCK_SHARED
- * to ensure we serialise the fault barrier in place.
+ * pfn_mkwrite was originally intended to ensure we capture time stamp updates
+ * on write faults. In reality, it needs to serialise against truncate and
+ * prepare memory for writing so handle is as standard write fault.
  */
 static int
 xfs_filemap_pfn_mkwrite(
 	struct vm_fault		*vmf)
 {
 
-	struct inode		*inode = file_inode(vmf->vma->vm_file);
-	struct xfs_inode	*ip = XFS_I(inode);
-	int			ret = VM_FAULT_NOPAGE;
-	loff_t			size;
-
-	trace_xfs_filemap_pfn_mkwrite(ip);
-
-	sb_start_pagefault(inode->i_sb);
-	file_update_time(vmf->vma->vm_file);
-
-	/* check if the faulting page hasn't raced with truncate */
-	xfs_ilock(ip, XFS_MMAPLOCK_SHARED);
-	size = (i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT;
-	if (vmf->pgoff >= size)
-		ret = VM_FAULT_SIGBUS;
-	else if (IS_DAX(inode))
-		ret = dax_iomap_fault(vmf, PE_SIZE_PTE, NULL, &xfs_iomap_ops);
-	xfs_iunlock(ip, XFS_MMAPLOCK_SHARED);
-	sb_end_pagefault(inode->i_sb);
-	return ret;
-
+	return __xfs_filemap_fault(vmf, PE_SIZE_PTE, true);
 }
 
 static const struct vm_operations_struct xfs_file_vm_ops = {
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index bb5514688d47..6333ad09e0f3 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -688,8 +688,6 @@ DEFINE_INODE_EVENT(xfs_inode_set_cowblocks_tag);
 DEFINE_INODE_EVENT(xfs_inode_clear_cowblocks_tag);
 DEFINE_INODE_EVENT(xfs_inode_free_cowblocks_invalid);
 
-DEFINE_INODE_EVENT(xfs_filemap_pfn_mkwrite);
-
 TRACE_EVENT(xfs_filemap_fault,
 	TP_PROTO(struct xfs_inode *ip, enum page_entry_size pe_size,
 		 bool write_fault),
-- 
2.12.3