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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 | ||
27359fd6 MW |
10 | typedef unsigned long dax_entry_t; |
11 | ||
a254e568 | 12 | struct iomap_ops; |
6568b08b DW |
13 | struct dax_device; |
14 | struct dax_operations { | |
15 | /* | |
16 | * direct_access: translate a device-relative | |
17 | * logical-page-offset into an absolute physical pfn. Return the | |
18 | * number of pages available for DAX at that pfn. | |
19 | */ | |
20 | long (*direct_access)(struct dax_device *, pgoff_t, long, | |
21 | void **, pfn_t *); | |
5d61e43b | 22 | /* copy_from_iter: required operation for fs-dax direct-i/o */ |
0aed55af DW |
23 | size_t (*copy_from_iter)(struct dax_device *, pgoff_t, void *, size_t, |
24 | struct iov_iter *); | |
b3a9a0c3 DW |
25 | /* copy_to_iter: required operation for fs-dax direct-i/o */ |
26 | size_t (*copy_to_iter)(struct dax_device *, pgoff_t, void *, size_t, | |
27 | struct iov_iter *); | |
6568b08b | 28 | }; |
a254e568 | 29 | |
6e0c90d6 DW |
30 | extern struct attribute_group dax_attribute_group; |
31 | ||
f5705aa8 DW |
32 | #if IS_ENABLED(CONFIG_DAX) |
33 | struct dax_device *dax_get_by_host(const char *host); | |
976431b0 DW |
34 | struct dax_device *alloc_dax(void *private, const char *host, |
35 | const struct dax_operations *ops); | |
f5705aa8 | 36 | void put_dax(struct dax_device *dax_dev); |
976431b0 DW |
37 | void kill_dax(struct dax_device *dax_dev); |
38 | void dax_write_cache(struct dax_device *dax_dev, bool wc); | |
39 | bool dax_write_cache_enabled(struct dax_device *dax_dev); | |
f5705aa8 DW |
40 | #else |
41 | static inline struct dax_device *dax_get_by_host(const char *host) | |
42 | { | |
43 | return NULL; | |
44 | } | |
976431b0 DW |
45 | static inline struct dax_device *alloc_dax(void *private, const char *host, |
46 | const struct dax_operations *ops) | |
47 | { | |
48 | /* | |
49 | * Callers should check IS_ENABLED(CONFIG_DAX) to know if this | |
50 | * NULL is an error or expected. | |
51 | */ | |
52 | return NULL; | |
53 | } | |
f5705aa8 DW |
54 | static inline void put_dax(struct dax_device *dax_dev) |
55 | { | |
56 | } | |
976431b0 DW |
57 | static inline void kill_dax(struct dax_device *dax_dev) |
58 | { | |
59 | } | |
60 | static inline void dax_write_cache(struct dax_device *dax_dev, bool wc) | |
61 | { | |
62 | } | |
63 | static inline bool dax_write_cache_enabled(struct dax_device *dax_dev) | |
64 | { | |
65 | return false; | |
66 | } | |
f5705aa8 DW |
67 | #endif |
68 | ||
f44c7763 | 69 | struct writeback_control; |
ef510424 DW |
70 | int bdev_dax_pgoff(struct block_device *, sector_t, size_t, pgoff_t *pgoff); |
71 | #if IS_ENABLED(CONFIG_FS_DAX) | |
80660f20 DJ |
72 | bool __bdev_dax_supported(struct block_device *bdev, int blocksize); |
73 | static inline bool bdev_dax_supported(struct block_device *bdev, int blocksize) | |
ef510424 | 74 | { |
ba23cba9 | 75 | return __bdev_dax_supported(bdev, blocksize); |
ef510424 | 76 | } |
f5705aa8 DW |
77 | |
78 | static inline struct dax_device *fs_dax_get_by_host(const char *host) | |
79 | { | |
80 | return dax_get_by_host(host); | |
81 | } | |
82 | ||
83 | static inline void fs_put_dax(struct dax_device *dax_dev) | |
84 | { | |
85 | put_dax(dax_dev); | |
86 | } | |
87 | ||
78f35473 | 88 | struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev); |
f44c7763 DW |
89 | int dax_writeback_mapping_range(struct address_space *mapping, |
90 | struct block_device *bdev, struct writeback_control *wbc); | |
5fac7408 DW |
91 | |
92 | struct page *dax_layout_busy_page(struct address_space *mapping); | |
27359fd6 MW |
93 | dax_entry_t dax_lock_page(struct page *page); |
94 | void dax_unlock_page(struct page *page, dax_entry_t cookie); | |
ef510424 | 95 | #else |
80660f20 | 96 | static inline bool bdev_dax_supported(struct block_device *bdev, |
ba23cba9 | 97 | int blocksize) |
ef510424 | 98 | { |
80660f20 | 99 | return false; |
ef510424 | 100 | } |
ef510424 | 101 | |
f5705aa8 | 102 | static inline struct dax_device *fs_dax_get_by_host(const char *host) |
ef510424 DW |
103 | { |
104 | return NULL; | |
105 | } | |
106 | ||
f5705aa8 | 107 | static inline void fs_put_dax(struct dax_device *dax_dev) |
ef510424 DW |
108 | { |
109 | } | |
78f35473 DW |
110 | |
111 | static inline struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev) | |
112 | { | |
113 | return NULL; | |
114 | } | |
f44c7763 | 115 | |
5fac7408 DW |
116 | static inline struct page *dax_layout_busy_page(struct address_space *mapping) |
117 | { | |
118 | return NULL; | |
119 | } | |
120 | ||
f44c7763 DW |
121 | static inline int dax_writeback_mapping_range(struct address_space *mapping, |
122 | struct block_device *bdev, struct writeback_control *wbc) | |
123 | { | |
124 | return -EOPNOTSUPP; | |
125 | } | |
c2a7d2a1 | 126 | |
27359fd6 | 127 | static inline dax_entry_t dax_lock_page(struct page *page) |
c2a7d2a1 DW |
128 | { |
129 | if (IS_DAX(page->mapping->host)) | |
27359fd6 MW |
130 | return ~0UL; |
131 | return 0; | |
c2a7d2a1 DW |
132 | } |
133 | ||
27359fd6 | 134 | static inline void dax_unlock_page(struct page *page, dax_entry_t cookie) |
c2a7d2a1 DW |
135 | { |
136 | } | |
ef510424 DW |
137 | #endif |
138 | ||
7b6be844 DW |
139 | int dax_read_lock(void); |
140 | void dax_read_unlock(int id); | |
c1d6e828 | 141 | bool dax_alive(struct dax_device *dax_dev); |
c1d6e828 | 142 | void *dax_get_private(struct dax_device *dax_dev); |
b0686260 DW |
143 | long dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages, |
144 | void **kaddr, pfn_t *pfn); | |
7e026c8c DW |
145 | size_t dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr, |
146 | size_t bytes, struct iov_iter *i); | |
b3a9a0c3 DW |
147 | size_t dax_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr, |
148 | size_t bytes, struct iov_iter *i); | |
c3ca015f | 149 | void dax_flush(struct dax_device *dax_dev, void *addr, size_t size); |
7b6be844 | 150 | |
11c59c92 | 151 | ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter, |
8ff6daa1 | 152 | const struct iomap_ops *ops); |
f77bc3a8 | 153 | vm_fault_t dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size, |
c0b24625 | 154 | pfn_t *pfnp, int *errp, const struct iomap_ops *ops); |
ab77dab4 SJ |
155 | vm_fault_t dax_finish_sync_fault(struct vm_fault *vmf, |
156 | enum page_entry_size pe_size, pfn_t pfn); | |
ac401cc7 | 157 | int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index); |
c6dcf52c JK |
158 | int dax_invalidate_mapping_entry_sync(struct address_space *mapping, |
159 | pgoff_t index); | |
d1a5f2b4 DW |
160 | |
161 | #ifdef CONFIG_FS_DAX | |
cccbce67 DW |
162 | int __dax_zero_page_range(struct block_device *bdev, |
163 | struct dax_device *dax_dev, sector_t sector, | |
679c8bd3 | 164 | unsigned int offset, unsigned int length); |
d1a5f2b4 | 165 | #else |
679c8bd3 | 166 | static inline int __dax_zero_page_range(struct block_device *bdev, |
cccbce67 DW |
167 | struct dax_device *dax_dev, sector_t sector, |
168 | unsigned int offset, unsigned int length) | |
679c8bd3 CH |
169 | { |
170 | return -ENXIO; | |
171 | } | |
d1a5f2b4 DW |
172 | #endif |
173 | ||
f9fe48be RZ |
174 | static inline bool dax_mapping(struct address_space *mapping) |
175 | { | |
176 | return mapping->host && IS_DAX(mapping->host); | |
177 | } | |
7f6d5b52 | 178 | |
c94c2acf | 179 | #endif |