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authorDan Williams <dan.j.williams@intel.com>2017-01-25 03:44:18 +0100
committerDan Williams <dan.j.williams@intel.com>2017-04-20 00:14:35 +0200
commit6568b08b77816cda2a95919c7494108d983d5941 (patch)
treecdc776afdf8dd6c583155d169017eb78ab94a8bf /drivers/dax
parentdax: add a facility to lookup a dax device by 'host' device name (diff)
downloadlinux-6568b08b77816cda2a95919c7494108d983d5941.tar.xz
linux-6568b08b77816cda2a95919c7494108d983d5941.zip
dax: introduce dax_operations
Track a set of dax_operations per dax_device that can be set at alloc_dax() time. These operations will be used to stop the abuse of block_device_operations for communicating dax capabilities to filesystems. It will also be used to replace the "pmem api" and move pmem-specific cache maintenance, and other dax-driver-specific filesystem-dax operations, to dax device methods. In particular this allows us to stop abusing __copy_user_nocache(), via memcpy_to_pmem(), with a driver specific replacement. This is a standalone introduction of the operations. Follow on patches convert each dax-driver and teach fs/dax.c to use ->direct_access() from dax_operations instead of block_device_operations. Suggested-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dax')
-rw-r--r--drivers/dax/dax.h4
-rw-r--r--drivers/dax/device.c6
-rw-r--r--drivers/dax/super.c6
3 files changed, 13 insertions, 3 deletions
diff --git a/drivers/dax/dax.h b/drivers/dax/dax.h
index 246a24d68d4c..617bbc24be2b 100644
--- a/drivers/dax/dax.h
+++ b/drivers/dax/dax.h
@@ -13,7 +13,9 @@
#ifndef __DAX_H__
#define __DAX_H__
struct dax_device;
-struct dax_device *alloc_dax(void *private, const char *host);
+struct dax_operations;
+struct dax_device *alloc_dax(void *private, const char *host,
+ const struct dax_operations *ops);
void put_dax(struct dax_device *dax_dev);
bool dax_alive(struct dax_device *dax_dev);
void kill_dax(struct dax_device *dax_dev);
diff --git a/drivers/dax/device.c b/drivers/dax/device.c
index db68f4fa8ce0..a0db055054a4 100644
--- a/drivers/dax/device.c
+++ b/drivers/dax/device.c
@@ -645,7 +645,11 @@ struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region,
goto err_id;
}
- dax_dev = alloc_dax(dev_dax, NULL);
+ /*
+ * No 'host' or dax_operations since there is no access to this
+ * device outside of mmap of the resulting character device.
+ */
+ dax_dev = alloc_dax(dev_dax, NULL, NULL);
if (!dax_dev)
goto err_dax;
diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index 8d446674c1da..1a58542ee8fd 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -17,6 +17,7 @@
#include <linux/cdev.h>
#include <linux/hash.h>
#include <linux/slab.h>
+#include <linux/dax.h>
#include <linux/fs.h>
static int nr_dax = CONFIG_NR_DEV_DAX;
@@ -61,6 +62,7 @@ struct dax_device {
const char *host;
void *private;
bool alive;
+ const struct dax_operations *ops;
};
bool dax_alive(struct dax_device *dax_dev)
@@ -208,7 +210,8 @@ static void dax_add_host(struct dax_device *dax_dev, const char *host)
spin_unlock(&dax_host_lock);
}
-struct dax_device *alloc_dax(void *private, const char *__host)
+struct dax_device *alloc_dax(void *private, const char *__host,
+ const struct dax_operations *ops)
{
struct dax_device *dax_dev;
const char *host;
@@ -229,6 +232,7 @@ struct dax_device *alloc_dax(void *private, const char *__host)
goto err_dev;
dax_add_host(dax_dev, host);
+ dax_dev->ops = ops;
dax_dev->private = private;
return dax_dev;