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From 504a1f15ee695aac07b60e89d6c140980f22ed34 Mon Sep 17 00:00:00 2001
From: John Stultz <john.stultz@linaro.org>
Date: Thu, 25 Jul 2013 13:37:51 -0700
Subject: [PATCH 0817/1302] vrange: Add support for volatile ranges on file
mappings
Like with the mm struct, this patch add basic support for
volatile ranges on file address_space structures. This allows
for volatile ranges to be set on mmapped files that can be
shared between processes.
The semantics on the volatile range sharing is that the
volatility is shared, just as the data is shared. Thus
if one process marks the range as volatile, the data is
volatile in all processes that have those pages mapped.
It is advised that processes coodinate when using volatile
ranges on shared mappings (much as they must coordinate when
writing to shared data).
XXX: Likely squish down file parts of dynamic vroot allocation into
this patch
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
---
fs/inode.c | 4 ++++
include/linux/fs.h | 4 ++++
2 files changed, 8 insertions(+)
diff --git a/fs/inode.c b/fs/inode.c
index 00d5fc3..a4a6844 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);
@@ -1417,6 +1419,8 @@ static void iput_final(struct inode *inode)
inode_lru_list_del(inode);
spin_unlock(&inode->i_lock);
+ vrange_root_cleanup(&inode->i_mapping->vroot);
+
evict(inode);
}
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 65c2be2..925714d 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 +412,9 @@ 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 */
+#ifdef CONFIG_MMU
+ struct vrange_root vroot;
+#endif
/* Protected by tree_lock together with the radix tree */
unsigned long nrpages; /* number of total pages */
pgoff_t writeback_index;/* writeback starts here */
--
1.8.3.2
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