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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
c94c2acf MW |
2 | #ifndef _LINUX_DAX_H |
3 | #define _LINUX_DAX_H | |
4 | ||
5 | #include <linux/fs.h> | |
6 | #include <linux/mm.h> | |
4f622938 | 7 | #include <linux/radix-tree.h> |
c94c2acf MW |
8 | #include <asm/pgtable.h> |
9 | ||
a254e568 | 10 | struct iomap_ops; |
6568b08b DW |
11 | struct dax_device; |
12 | struct dax_operations { | |
13 | /* | |
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. | |
17 | */ | |
18 | long (*direct_access)(struct dax_device *, pgoff_t, long, | |
19 | void **, pfn_t *); | |
5d61e43b | 20 | /* copy_from_iter: required operation for fs-dax direct-i/o */ |
0aed55af DW |
21 | size_t (*copy_from_iter)(struct dax_device *, pgoff_t, void *, size_t, |
22 | struct iov_iter *); | |
6568b08b | 23 | }; |
a254e568 | 24 | |
6e0c90d6 DW |
25 | extern struct attribute_group dax_attribute_group; |
26 | ||
f5705aa8 DW |
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); | |
30 | #else | |
31 | static inline struct dax_device *dax_get_by_host(const char *host) | |
32 | { | |
33 | return NULL; | |
34 | } | |
35 | ||
36 | static inline void put_dax(struct dax_device *dax_dev) | |
37 | { | |
38 | } | |
39 | #endif | |
40 | ||
ef510424 DW |
41 | int bdev_dax_pgoff(struct block_device *, sector_t, size_t, pgoff_t *pgoff); |
42 | #if IS_ENABLED(CONFIG_FS_DAX) | |
d8d53b26 DJ |
43 | bool __bdev_dax_supported(struct block_device *bdev, int blocksize); |
44 | static inline bool bdev_dax_supported(struct block_device *bdev, int blocksize) | |
ef510424 | 45 | { |
ca2fad73 | 46 | return __bdev_dax_supported(bdev, blocksize); |
ef510424 | 47 | } |
f5705aa8 DW |
48 | |
49 | static inline struct dax_device *fs_dax_get_by_host(const char *host) | |
50 | { | |
51 | return dax_get_by_host(host); | |
52 | } | |
53 | ||
54 | static inline void fs_put_dax(struct dax_device *dax_dev) | |
55 | { | |
56 | put_dax(dax_dev); | |
57 | } | |
58 | ||
78f35473 | 59 | struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev); |
ef510424 | 60 | #else |
d8d53b26 | 61 | static inline bool bdev_dax_supported(struct block_device *bdev, |
ca2fad73 | 62 | int blocksize) |
ef510424 | 63 | { |
d8d53b26 | 64 | return false; |
ef510424 | 65 | } |
ef510424 | 66 | |
f5705aa8 | 67 | static inline struct dax_device *fs_dax_get_by_host(const char *host) |
ef510424 DW |
68 | { |
69 | return NULL; | |
70 | } | |
71 | ||
f5705aa8 | 72 | static inline void fs_put_dax(struct dax_device *dax_dev) |
ef510424 DW |
73 | { |
74 | } | |
78f35473 DW |
75 | |
76 | static inline struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev) | |
77 | { | |
78 | return NULL; | |
79 | } | |
ef510424 DW |
80 | #endif |
81 | ||
7b6be844 DW |
82 | int dax_read_lock(void); |
83 | void dax_read_unlock(int id); | |
c1d6e828 DW |
84 | struct dax_device *alloc_dax(void *private, const char *host, |
85 | const struct dax_operations *ops); | |
c1d6e828 DW |
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); | |
b0686260 DW |
89 | long dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages, |
90 | void **kaddr, pfn_t *pfn); | |
7e026c8c DW |
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); | |
c3ca015f | 93 | void dax_flush(struct dax_device *dax_dev, void *addr, size_t size); |
6e0c90d6 | 94 | void dax_write_cache(struct dax_device *dax_dev, bool wc); |
273752c9 | 95 | bool dax_write_cache_enabled(struct dax_device *dax_dev); |
7b6be844 | 96 | |
11c59c92 | 97 | ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter, |
8ff6daa1 | 98 | const struct iomap_ops *ops); |
c791ace1 | 99 | int dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size, |
9a0dd422 | 100 | pfn_t *pfnp, const struct iomap_ops *ops); |
71eab6df JK |
101 | int dax_finish_sync_fault(struct vm_fault *vmf, enum page_entry_size pe_size, |
102 | pfn_t pfn); | |
ac401cc7 | 103 | int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index); |
c6dcf52c JK |
104 | int dax_invalidate_mapping_entry_sync(struct address_space *mapping, |
105 | pgoff_t index); | |
d1a5f2b4 DW |
106 | |
107 | #ifdef CONFIG_FS_DAX | |
cccbce67 DW |
108 | int __dax_zero_page_range(struct block_device *bdev, |
109 | struct dax_device *dax_dev, sector_t sector, | |
679c8bd3 | 110 | unsigned int offset, unsigned int length); |
d1a5f2b4 | 111 | #else |
679c8bd3 | 112 | static inline int __dax_zero_page_range(struct block_device *bdev, |
cccbce67 DW |
113 | struct dax_device *dax_dev, sector_t sector, |
114 | unsigned int offset, unsigned int length) | |
679c8bd3 CH |
115 | { |
116 | return -ENXIO; | |
117 | } | |
d1a5f2b4 DW |
118 | #endif |
119 | ||
f9fe48be RZ |
120 | static inline bool dax_mapping(struct address_space *mapping) |
121 | { | |
122 | return mapping->host && IS_DAX(mapping->host); | |
123 | } | |
7f6d5b52 RZ |
124 | |
125 | struct writeback_control; | |
126 | int dax_writeback_mapping_range(struct address_space *mapping, | |
127 | struct block_device *bdev, struct writeback_control *wbc); | |
c94c2acf | 128 | #endif |