[PATCH 23/23] ramfs: enable transparent huge page cache

["Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>]

From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>

ramfs is the most simple fs from page cache point of view. Let's start
transparent huge page cache enabling here.

ramfs pages are not movable[1] and switching to transhuge pages doesn't
affect that. We need to fix this eventually.

[1] http://lkml.org/lkml/2013/4/2/720

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 fs/ramfs/file-mmu.c | 3 ++-
 fs/ramfs/inode.c    | 6 +++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/fs/ramfs/file-mmu.c b/fs/ramfs/file-mmu.c
index 4884ac5..3236e41 100644
--- a/fs/ramfs/file-mmu.c
+++ b/fs/ramfs/file-mmu.c
@@ -32,7 +32,7 @@
 
 const struct address_space_operations ramfs_aops = {
 	.readpage	= simple_readpage,
-	.write_begin	= simple_write_begin,
+	.write_begin	= simple_thp_write_begin,
 	.write_end	= simple_write_end,
 	.set_page_dirty = __set_page_dirty_no_writeback,
 };
@@ -47,6 +47,7 @@ const struct file_operations ramfs_file_operations = {
 	.splice_read	= generic_file_splice_read,
 	.splice_write	= generic_file_splice_write,
 	.llseek		= generic_file_llseek,
+	.release	= simple_thp_release,
 };
 
 const struct inode_operations ramfs_file_inode_operations = {
diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c
index 39d1465..5dafdfc 100644
--- a/fs/ramfs/inode.c
+++ b/fs/ramfs/inode.c
@@ -61,7 +61,11 @@ struct inode *ramfs_get_inode(struct super_block *sb,
 		inode_init_owner(inode, dir, mode);
 		inode->i_mapping->a_ops = &ramfs_aops;
 		inode->i_mapping->backing_dev_info = &ramfs_backing_dev_info;
-		mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER);
+		/*
+		 * TODO: make ramfs pages movable
+		 */
+		mapping_set_gfp_mask(inode->i_mapping,
+				GFP_TRANSHUGE & ~__GFP_MOVABLE);
 		mapping_set_unevictable(inode->i_mapping);
 		inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 		switch (mode & S_IFMT) {
-- 
1.8.3.2

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