6 #include <linux/radix-tree.h>
7 #include <asm/pgtable.h>
11 struct dax_operations
{
13 * direct_access: translate a device-relative
14 * logical-page-offset into an absolute physical pfn. Return the
15 * number of pages available for DAX at that pfn.
17 long (*direct_access
)(struct dax_device
*, pgoff_t
, long,
19 /* copy_from_iter: required operation for fs-dax direct-i/o */
20 size_t (*copy_from_iter
)(struct dax_device
*, pgoff_t
, void *, size_t,
24 extern struct attribute_group dax_attribute_group
;
26 #if IS_ENABLED(CONFIG_DAX)
27 struct dax_device
*dax_get_by_host(const char *host
);
28 void put_dax(struct dax_device
*dax_dev
);
30 static inline struct dax_device
*dax_get_by_host(const char *host
)
35 static inline void put_dax(struct dax_device
*dax_dev
)
40 int bdev_dax_pgoff(struct block_device
*, sector_t
, size_t, pgoff_t
*pgoff
);
41 #if IS_ENABLED(CONFIG_FS_DAX)
42 int __bdev_dax_supported(struct super_block
*sb
, int blocksize
);
43 static inline int bdev_dax_supported(struct super_block
*sb
, int blocksize
)
45 return __bdev_dax_supported(sb
, blocksize
);
48 static inline struct dax_device
*fs_dax_get_by_host(const char *host
)
50 return dax_get_by_host(host
);
53 static inline void fs_put_dax(struct dax_device
*dax_dev
)
59 static inline int bdev_dax_supported(struct super_block
*sb
, int blocksize
)
64 static inline struct dax_device
*fs_dax_get_by_host(const char *host
)
69 static inline void fs_put_dax(struct dax_device
*dax_dev
)
74 int dax_read_lock(void);
75 void dax_read_unlock(int id
);
76 struct dax_device
*alloc_dax(void *private, const char *host
,
77 const struct dax_operations
*ops
);
78 bool dax_alive(struct dax_device
*dax_dev
);
79 void kill_dax(struct dax_device
*dax_dev
);
80 void *dax_get_private(struct dax_device
*dax_dev
);
81 long dax_direct_access(struct dax_device
*dax_dev
, pgoff_t pgoff
, long nr_pages
,
82 void **kaddr
, pfn_t
*pfn
);
83 size_t dax_copy_from_iter(struct dax_device
*dax_dev
, pgoff_t pgoff
, void *addr
,
84 size_t bytes
, struct iov_iter
*i
);
85 void dax_flush(struct dax_device
*dax_dev
, void *addr
, size_t size
);
86 void dax_write_cache(struct dax_device
*dax_dev
, bool wc
);
87 bool dax_write_cache_enabled(struct dax_device
*dax_dev
);
89 ssize_t
dax_iomap_rw(struct kiocb
*iocb
, struct iov_iter
*iter
,
90 const struct iomap_ops
*ops
);
91 int dax_iomap_fault(struct vm_fault
*vmf
, enum page_entry_size pe_size
,
92 const struct iomap_ops
*ops
);
93 int dax_delete_mapping_entry(struct address_space
*mapping
, pgoff_t index
);
94 int dax_invalidate_mapping_entry_sync(struct address_space
*mapping
,
98 int __dax_zero_page_range(struct block_device
*bdev
,
99 struct dax_device
*dax_dev
, sector_t sector
,
100 unsigned int offset
, unsigned int length
);
102 static inline int __dax_zero_page_range(struct block_device
*bdev
,
103 struct dax_device
*dax_dev
, sector_t sector
,
104 unsigned int offset
, unsigned int length
)
110 static inline bool dax_mapping(struct address_space
*mapping
)
112 return mapping
->host
&& IS_DAX(mapping
->host
);
115 struct writeback_control
;
116 int dax_writeback_mapping_range(struct address_space
*mapping
,
117 struct block_device
*bdev
, struct writeback_control
*wbc
);