1 /* SPDX-License-Identifier: GPL-2.0 */
7 #include <linux/radix-tree.h>
8 #include <asm/pgtable.h>
12 struct dax_operations {
14 * direct_access: translate a device-relative
15 * logical-page-offset into an absolute physical pfn. Return the
16 * number of pages available for DAX at that pfn.
18 long (*direct_access)(struct dax_device *, pgoff_t, long,
20 /* copy_from_iter: required operation for fs-dax direct-i/o */
21 size_t (*copy_from_iter)(struct dax_device *, pgoff_t, void *, size_t,
25 extern struct attribute_group dax_attribute_group;
27 #if IS_ENABLED(CONFIG_DAX)
28 struct dax_device *dax_get_by_host(const char *host);
29 void put_dax(struct dax_device *dax_dev);
31 static inline struct dax_device *dax_get_by_host(const char *host)
36 static inline void put_dax(struct dax_device *dax_dev)
41 int bdev_dax_pgoff(struct block_device *, sector_t, size_t, pgoff_t *pgoff);
42 #if IS_ENABLED(CONFIG_FS_DAX)
43 bool __bdev_dax_supported(struct block_device *bdev, int blocksize);
44 static inline bool bdev_dax_supported(struct block_device *bdev, int blocksize)
46 return __bdev_dax_supported(bdev, blocksize);
49 static inline struct dax_device *fs_dax_get_by_host(const char *host)
51 return dax_get_by_host(host);
54 static inline void fs_put_dax(struct dax_device *dax_dev)
59 struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev);
61 static inline bool bdev_dax_supported(struct block_device *bdev,
67 static inline struct dax_device *fs_dax_get_by_host(const char *host)
72 static inline void fs_put_dax(struct dax_device *dax_dev)
76 static inline struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev)
82 int dax_read_lock(void);
83 void dax_read_unlock(int id);
84 struct dax_device *alloc_dax(void *private, const char *host,
85 const struct dax_operations *ops);
86 bool dax_alive(struct dax_device *dax_dev);
87 void kill_dax(struct dax_device *dax_dev);
88 void *dax_get_private(struct dax_device *dax_dev);
89 long dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages,
90 void **kaddr, pfn_t *pfn);
91 size_t dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr,
92 size_t bytes, struct iov_iter *i);
93 void dax_flush(struct dax_device *dax_dev, void *addr, size_t size);
94 void dax_write_cache(struct dax_device *dax_dev, bool wc);
95 bool dax_write_cache_enabled(struct dax_device *dax_dev);
97 ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter,
98 const struct iomap_ops *ops);
99 int dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
100 const struct iomap_ops *ops);
101 int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
102 int dax_invalidate_mapping_entry_sync(struct address_space *mapping,
106 int __dax_zero_page_range(struct block_device *bdev,
107 struct dax_device *dax_dev, sector_t sector,
108 unsigned int offset, unsigned int length);
110 static inline int __dax_zero_page_range(struct block_device *bdev,
111 struct dax_device *dax_dev, sector_t sector,
112 unsigned int offset, unsigned int length)
118 static inline bool dax_mapping(struct address_space *mapping)
120 return mapping->host && IS_DAX(mapping->host);
123 struct writeback_control;
124 int dax_writeback_mapping_range(struct address_space *mapping,
125 struct block_device *bdev, struct writeback_control *wbc);