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libnvdimm: add dax_dev sync flag

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This patch adds 'DAXDEV_SYNC' flag which is set
for nd_region doing synchronous flush. This later
is used to disable MAP_SYNC functionality for
ext4 & xfs filesystem for devices don't support
synchronous flush.

Signed-off-by: Pankaj Gupta <pagupta@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Pankaj Gupta
2019-07-05 19:33:24 +05:30
committed by Dan Williams
parent 6e84200c0a
commit fefc1d97fa
8 changed files with 56 additions and 7 deletions
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24
include/linux/dax.h
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@@ -7,6 +7,9 @@
#include <linux/radix-tree.h>
#include <asm/pgtable.h>
/* Flag for synchronous flush */
#define DAXDEV_F_SYNC (1UL << 0)
typedef unsigned long dax_entry_t;
struct iomap_ops;
@@ -38,18 +41,28 @@ extern struct attribute_group dax_attribute_group;
#if IS_ENABLED(CONFIG_DAX)
struct dax_device *dax_get_by_host(const char *host);
struct dax_device *alloc_dax(void *private, const char *host,
const struct dax_operations *ops);
const struct dax_operations *ops, unsigned long flags);
void put_dax(struct dax_device *dax_dev);
void kill_dax(struct dax_device *dax_dev);
void dax_write_cache(struct dax_device *dax_dev, bool wc);
bool dax_write_cache_enabled(struct dax_device *dax_dev);
bool __dax_synchronous(struct dax_device *dax_dev);
static inline bool dax_synchronous(struct dax_device *dax_dev)
{
return __dax_synchronous(dax_dev);
}
void __set_dax_synchronous(struct dax_device *dax_dev);
static inline void set_dax_synchronous(struct dax_device *dax_dev)
{
__set_dax_synchronous(dax_dev);
}
#else
static inline struct dax_device *dax_get_by_host(const char *host)
{
return NULL;
}
static inline struct dax_device *alloc_dax(void *private, const char *host,
const struct dax_operations *ops)
const struct dax_operations *ops, unsigned long flags)
{
/*
* Callers should check IS_ENABLED(CONFIG_DAX) to know if this
@@ -70,6 +83,13 @@ static inline bool dax_write_cache_enabled(struct dax_device *dax_dev)
{
return false;
}
static inline bool dax_synchronous(struct dax_device *dax_dev)
{
return true;
}
static inline void set_dax_synchronous(struct dax_device *dax_dev)
{
}
#endif
struct writeback_control;