[PATCH 2/8] vrange: Add vrange support for file address_spaces

[John Stultz]

Modify address_space structures to be able to store vrange trees.

This includes logic to clear all volatile ranges when the last
file handle is closed.

Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Android Kernel Team <kernel-team@xxxxxxxxxxx>
Cc: Robert Love <rlove@xxxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Dave Hansen <dave@xxxxxxxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Dmitry Adamushko <dmitry.adamushko@xxxxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Neil Brown <neilb@xxxxxxx>
Cc: Andrea Righi <andrea@xxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Cc: Mike Hommey <mh@xxxxxxxxxxxx>
Cc: Taras Glek <tglek@xxxxxxxxxxx>
Cc: Dhaval Giani <dgiani@xxxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxx>
Cc: Michel Lespinasse <walken@xxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx <linux-mm@xxxxxxxxx>
Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
[jstultz: Major refactoring of the code]
Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
---
 fs/file_table.c    | 5 +++++
 fs/inode.c         | 2 ++
 include/linux/fs.h | 2 ++
 3 files changed, 9 insertions(+)

diff --git a/fs/file_table.c b/fs/file_table.c
index cd4d87a..94e2cd3 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -26,6 +26,7 @@
 #include <linux/hardirq.h>
 #include <linux/task_work.h>
 #include <linux/ima.h>
+#include <linux/vrange.h>
 
 #include <linux/atomic.h>
 
@@ -244,6 +245,10 @@ static void __fput(struct file *file)
 			file->f_op->fasync(-1, file, 0);
 	}
 	ima_file_free(file);
+
+	/* drop all vranges on last close */
+	vrange_root_cleanup(&inode->i_mapping->vroot);
+
 	if (file->f_op && file->f_op->release)
 		file->f_op->release(inode, file);
 	security_file_free(file);
diff --git a/fs/inode.c b/fs/inode.c
index 00d5fc3..bf32780 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -17,6 +17,7 @@
 #include <linux/prefetch.h>
 #include <linux/buffer_head.h> /* for inode_has_buffers */
 #include <linux/ratelimit.h>
+#include <linux/vrange.h>
 #include "internal.h"
 
 /*
@@ -350,6 +351,7 @@ void address_space_init_once(struct address_space *mapping)
 	spin_lock_init(&mapping->private_lock);
 	mapping->i_mmap = RB_ROOT;
 	INIT_LIST_HEAD(&mapping->i_mmap_nonlinear);
+	vrange_root_init(&mapping->vroot, VRANGE_FILE);
 }
 EXPORT_SYMBOL(address_space_init_once);
 
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 43db02e..1cbed73 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -27,6 +27,7 @@
 #include <linux/lockdep.h>
 #include <linux/percpu-rwsem.h>
 #include <linux/blk_types.h>
+#include <linux/vrange_types.h>
 
 #include <asm/byteorder.h>
 #include <uapi/linux/fs.h>
@@ -411,6 +412,7 @@ struct address_space {
 	struct rb_root		i_mmap;		/* tree of private and shared mappings */
 	struct list_head	i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
 	struct mutex		i_mmap_mutex;	/* protect tree, count, list */
+	struct vrange_root	vroot;
 	/* Protected by tree_lock together with the radix tree */
 	unsigned long		nrpages;	/* number of total pages */
 	pgoff_t			writeback_index;/* writeback starts here */
-- 
1.8.1.2

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