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)
58 struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev);
60 static inline int bdev_dax_supported(struct super_block *sb, int blocksize)
65 static inline struct dax_device *fs_dax_get_by_host(const char *host)
70 static inline void fs_put_dax(struct dax_device *dax_dev)
74 static inline struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev)
80 int dax_read_lock(void);
81 void dax_read_unlock(int id);
82 struct dax_device *alloc_dax(void *private, const char *host,
83 const struct dax_operations *ops);
84 bool dax_alive(struct dax_device *dax_dev);
85 void kill_dax(struct dax_device *dax_dev);
86 void *dax_get_private(struct dax_device *dax_dev);
87 long dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages,
88 void **kaddr, pfn_t *pfn);
89 size_t dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr,
90 size_t bytes, struct iov_iter *i);
91 void dax_flush(struct dax_device *dax_dev, void *addr, size_t size);
92 void dax_write_cache(struct dax_device *dax_dev, bool wc);
93 bool dax_write_cache_enabled(struct dax_device *dax_dev);
95 ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter,
96 const struct iomap_ops *ops);
97 int dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
98 const struct iomap_ops *ops);
99 int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
100 int dax_invalidate_mapping_entry_sync(struct address_space *mapping,
104 int __dax_zero_page_range(struct block_device *bdev,
105 struct dax_device *dax_dev, sector_t sector,
106 unsigned int offset, unsigned int length);
108 static inline int __dax_zero_page_range(struct block_device *bdev,
109 struct dax_device *dax_dev, sector_t sector,
110 unsigned int offset, unsigned int length)
116 static inline bool dax_mapping(struct address_space *mapping)
118 return mapping->host && IS_DAX(mapping->host);
121 struct writeback_control;
122 int dax_writeback_mapping_range(struct address_space *mapping,
123 struct block_device *bdev, struct writeback_control *wbc);