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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 *); | |
7bf7eac8 DW |
22 | /* |
23 | * Validate whether this device is usable as an fsdax backing | |
24 | * device. | |
25 | */ | |
26 | bool (*dax_supported)(struct dax_device *, struct block_device *, int, | |
27 | sector_t, sector_t); | |
5d61e43b | 28 | /* copy_from_iter: required operation for fs-dax direct-i/o */ |
0aed55af DW |
29 | size_t (*copy_from_iter)(struct dax_device *, pgoff_t, void *, size_t, |
30 | struct iov_iter *); | |
b3a9a0c3 DW |
31 | /* copy_to_iter: required operation for fs-dax direct-i/o */ |
32 | size_t (*copy_to_iter)(struct dax_device *, pgoff_t, void *, size_t, | |
33 | struct iov_iter *); | |
6568b08b | 34 | }; |
a254e568 | 35 | |
6e0c90d6 DW |
36 | extern struct attribute_group dax_attribute_group; |
37 | ||
f5705aa8 DW |
38 | #if IS_ENABLED(CONFIG_DAX) |
39 | struct dax_device *dax_get_by_host(const char *host); | |
976431b0 DW |
40 | struct dax_device *alloc_dax(void *private, const char *host, |
41 | const struct dax_operations *ops); | |
f5705aa8 | 42 | void put_dax(struct dax_device *dax_dev); |
976431b0 DW |
43 | void kill_dax(struct dax_device *dax_dev); |
44 | void dax_write_cache(struct dax_device *dax_dev, bool wc); | |
45 | bool dax_write_cache_enabled(struct dax_device *dax_dev); | |
f5705aa8 DW |
46 | #else |
47 | static inline struct dax_device *dax_get_by_host(const char *host) | |
48 | { | |
49 | return NULL; | |
50 | } | |
976431b0 DW |
51 | static inline struct dax_device *alloc_dax(void *private, const char *host, |
52 | const struct dax_operations *ops) | |
53 | { | |
54 | /* | |
55 | * Callers should check IS_ENABLED(CONFIG_DAX) to know if this | |
56 | * NULL is an error or expected. | |
57 | */ | |
58 | return NULL; | |
59 | } | |
f5705aa8 DW |
60 | static inline void put_dax(struct dax_device *dax_dev) |
61 | { | |
62 | } | |
976431b0 DW |
63 | static inline void kill_dax(struct dax_device *dax_dev) |
64 | { | |
65 | } | |
66 | static inline void dax_write_cache(struct dax_device *dax_dev, bool wc) | |
67 | { | |
68 | } | |
69 | static inline bool dax_write_cache_enabled(struct dax_device *dax_dev) | |
70 | { | |
71 | return false; | |
72 | } | |
f5705aa8 DW |
73 | #endif |
74 | ||
f44c7763 | 75 | struct writeback_control; |
ef510424 DW |
76 | int bdev_dax_pgoff(struct block_device *, sector_t, size_t, pgoff_t *pgoff); |
77 | #if IS_ENABLED(CONFIG_FS_DAX) | |
80660f20 DJ |
78 | bool __bdev_dax_supported(struct block_device *bdev, int blocksize); |
79 | static inline bool bdev_dax_supported(struct block_device *bdev, int blocksize) | |
ef510424 | 80 | { |
ba23cba9 | 81 | return __bdev_dax_supported(bdev, blocksize); |
ef510424 | 82 | } |
f5705aa8 | 83 | |
7bf7eac8 DW |
84 | bool __generic_fsdax_supported(struct dax_device *dax_dev, |
85 | struct block_device *bdev, int blocksize, sector_t start, | |
86 | sector_t sectors); | |
87 | static inline bool generic_fsdax_supported(struct dax_device *dax_dev, | |
88 | struct block_device *bdev, int blocksize, sector_t start, | |
89 | sector_t sectors) | |
90 | { | |
91 | return __generic_fsdax_supported(dax_dev, bdev, blocksize, start, | |
92 | sectors); | |
93 | } | |
94 | ||
f5705aa8 DW |
95 | static inline struct dax_device *fs_dax_get_by_host(const char *host) |
96 | { | |
97 | return dax_get_by_host(host); | |
98 | } | |
99 | ||
100 | static inline void fs_put_dax(struct dax_device *dax_dev) | |
101 | { | |
102 | put_dax(dax_dev); | |
103 | } | |
104 | ||
78f35473 | 105 | struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev); |
f44c7763 DW |
106 | int dax_writeback_mapping_range(struct address_space *mapping, |
107 | struct block_device *bdev, struct writeback_control *wbc); | |
5fac7408 DW |
108 | |
109 | struct page *dax_layout_busy_page(struct address_space *mapping); | |
27359fd6 MW |
110 | dax_entry_t dax_lock_page(struct page *page); |
111 | void dax_unlock_page(struct page *page, dax_entry_t cookie); | |
ef510424 | 112 | #else |
80660f20 | 113 | static inline bool bdev_dax_supported(struct block_device *bdev, |
ba23cba9 | 114 | int blocksize) |
ef510424 | 115 | { |
80660f20 | 116 | return false; |
ef510424 | 117 | } |
ef510424 | 118 | |
7bf7eac8 DW |
119 | static inline bool generic_fsdax_supported(struct dax_device *dax_dev, |
120 | struct block_device *bdev, int blocksize, sector_t start, | |
121 | sector_t sectors) | |
122 | { | |
123 | return false; | |
124 | } | |
125 | ||
f5705aa8 | 126 | static inline struct dax_device *fs_dax_get_by_host(const char *host) |
ef510424 DW |
127 | { |
128 | return NULL; | |
129 | } | |
130 | ||
f5705aa8 | 131 | static inline void fs_put_dax(struct dax_device *dax_dev) |
ef510424 DW |
132 | { |
133 | } | |
78f35473 DW |
134 | |
135 | static inline struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev) | |
136 | { | |
137 | return NULL; | |
138 | } | |
f44c7763 | 139 | |
5fac7408 DW |
140 | static inline struct page *dax_layout_busy_page(struct address_space *mapping) |
141 | { | |
142 | return NULL; | |
143 | } | |
144 | ||
f44c7763 DW |
145 | static inline int dax_writeback_mapping_range(struct address_space *mapping, |
146 | struct block_device *bdev, struct writeback_control *wbc) | |
147 | { | |
148 | return -EOPNOTSUPP; | |
149 | } | |
c2a7d2a1 | 150 | |
27359fd6 | 151 | static inline dax_entry_t dax_lock_page(struct page *page) |
c2a7d2a1 DW |
152 | { |
153 | if (IS_DAX(page->mapping->host)) | |
27359fd6 MW |
154 | return ~0UL; |
155 | return 0; | |
c2a7d2a1 DW |
156 | } |
157 | ||
27359fd6 | 158 | static inline void dax_unlock_page(struct page *page, dax_entry_t cookie) |
c2a7d2a1 DW |
159 | { |
160 | } | |
ef510424 DW |
161 | #endif |
162 | ||
7b6be844 DW |
163 | int dax_read_lock(void); |
164 | void dax_read_unlock(int id); | |
c1d6e828 | 165 | bool dax_alive(struct dax_device *dax_dev); |
c1d6e828 | 166 | void *dax_get_private(struct dax_device *dax_dev); |
b0686260 DW |
167 | long dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages, |
168 | void **kaddr, pfn_t *pfn); | |
7bf7eac8 DW |
169 | bool dax_supported(struct dax_device *dax_dev, struct block_device *bdev, |
170 | int blocksize, sector_t start, sector_t len); | |
7e026c8c DW |
171 | size_t dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr, |
172 | size_t bytes, struct iov_iter *i); | |
b3a9a0c3 DW |
173 | size_t dax_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr, |
174 | size_t bytes, struct iov_iter *i); | |
c3ca015f | 175 | void dax_flush(struct dax_device *dax_dev, void *addr, size_t size); |
7b6be844 | 176 | |
11c59c92 | 177 | ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter, |
8ff6daa1 | 178 | const struct iomap_ops *ops); |
f77bc3a8 | 179 | vm_fault_t dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size, |
c0b24625 | 180 | pfn_t *pfnp, int *errp, const struct iomap_ops *ops); |
ab77dab4 SJ |
181 | vm_fault_t dax_finish_sync_fault(struct vm_fault *vmf, |
182 | enum page_entry_size pe_size, pfn_t pfn); | |
ac401cc7 | 183 | int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index); |
c6dcf52c JK |
184 | int dax_invalidate_mapping_entry_sync(struct address_space *mapping, |
185 | pgoff_t index); | |
d1a5f2b4 DW |
186 | |
187 | #ifdef CONFIG_FS_DAX | |
cccbce67 DW |
188 | int __dax_zero_page_range(struct block_device *bdev, |
189 | struct dax_device *dax_dev, sector_t sector, | |
679c8bd3 | 190 | unsigned int offset, unsigned int length); |
d1a5f2b4 | 191 | #else |
679c8bd3 | 192 | static inline int __dax_zero_page_range(struct block_device *bdev, |
cccbce67 DW |
193 | struct dax_device *dax_dev, sector_t sector, |
194 | unsigned int offset, unsigned int length) | |
679c8bd3 CH |
195 | { |
196 | return -ENXIO; | |
197 | } | |
d1a5f2b4 DW |
198 | #endif |
199 | ||
f9fe48be RZ |
200 | static inline bool dax_mapping(struct address_space *mapping) |
201 | { | |
202 | return mapping->host && IS_DAX(mapping->host); | |
203 | } | |
7f6d5b52 | 204 | |
c94c2acf | 205 | #endif |