linux-kernel - [PATCH 7/8] xfs: Support for transparent PUD pages

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Date:	Thu, 24 Dec 2015 11:20:36 -0500
From:	Matthew Wilcox <matthew.r.wilcox@...el.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	Matthew Wilcox <willy@...ux.intel.com>, linux-mm@...ck.org,
	linux-nvdimm@...ts.01.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, x86@...nel.org
Subject: [PATCH 7/8] xfs: Support for transparent PUD pages

From: Matthew Wilcox <willy@...ux.intel.com>

Call into DAX to provide support for PUD pages, just like the PMD cases.

Signed-off-by: Matthew Wilcox <willy@...ux.intel.com>
---
 fs/xfs/xfs_file.c  | 33 +++++++++++++++++++++++++++++++++
 fs/xfs/xfs_trace.h |  1 +
 2 files changed, 34 insertions(+)

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index f5392ab..a81b942 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1600,6 +1600,38 @@ xfs_filemap_pmd_fault(
 	return ret;
 }
 
+STATIC int
+xfs_filemap_pud_fault(
+	struct vm_area_struct	*vma,
+	unsigned long		addr,
+	pud_t			*pud,
+	unsigned int		flags)
+{
+	struct inode		*inode = file_inode(vma->vm_file);
+	struct xfs_inode	*ip = XFS_I(inode);
+	int			ret;
+
+	if (!IS_DAX(inode))
+		return VM_FAULT_FALLBACK;
+
+	trace_xfs_filemap_pud_fault(ip);
+
+	if (flags & FAULT_FLAG_WRITE) {
+		sb_start_pagefault(inode->i_sb);
+		file_update_time(vma->vm_file);
+	}
+
+	xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
+	ret = __dax_pud_fault(vma, addr, pud, flags, xfs_get_blocks_dax_fault,
+			      NULL);
+	xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
+
+	if (flags & FAULT_FLAG_WRITE)
+		sb_end_pagefault(inode->i_sb);
+
+	return ret;
+}
+
 /*
  * pfn_mkwrite was originally inteneded to ensure we capture time stamp
  * updates on write faults. In reality, it's need to serialise against
@@ -1637,6 +1669,7 @@ xfs_filemap_pfn_mkwrite(
 static const struct vm_operations_struct xfs_file_vm_ops = {
 	.fault		= xfs_filemap_fault,
 	.pmd_fault	= xfs_filemap_pmd_fault,
+	.pud_fault	= xfs_filemap_pud_fault,
 	.map_pages	= filemap_map_pages,
 	.page_mkwrite	= xfs_filemap_page_mkwrite,
 	.pfn_mkwrite	= xfs_filemap_pfn_mkwrite,
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index 877079eb..16442bb 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -688,6 +688,7 @@ DEFINE_INODE_EVENT(xfs_inode_free_eofblocks_invalid);
 
 DEFINE_INODE_EVENT(xfs_filemap_fault);
 DEFINE_INODE_EVENT(xfs_filemap_pmd_fault);
+DEFINE_INODE_EVENT(xfs_filemap_pud_fault);
 DEFINE_INODE_EVENT(xfs_filemap_page_mkwrite);
 DEFINE_INODE_EVENT(xfs_filemap_pfn_mkwrite);
 
-- 
2.6.2

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