This source file includes following definitions.
- dax_synchronous
- set_dax_synchronous
- daxdev_mapping_supported
- dax_get_by_host
- alloc_dax
- put_dax
- kill_dax
- dax_write_cache
- dax_write_cache_enabled
- dax_synchronous
- set_dax_synchronous
- daxdev_mapping_supported
- bdev_dax_supported
- generic_fsdax_supported
- fs_dax_get_by_host
- fs_put_dax
- bdev_dax_supported
- generic_fsdax_supported
- fs_dax_get_by_host
- fs_put_dax
- fs_dax_get_by_bdev
- dax_layout_busy_page
- dax_writeback_mapping_range
- dax_lock_page
- dax_unlock_page
- __dax_zero_page_range
- dax_mapping
1
2 #ifndef _LINUX_DAX_H
3 #define _LINUX_DAX_H
4
5 #include <linux/fs.h>
6 #include <linux/mm.h>
7 #include <linux/radix-tree.h>
8 #include <asm/pgtable.h>
9
10
11 #define DAXDEV_F_SYNC (1UL << 0)
12
13 typedef unsigned long dax_entry_t;
14
15 struct iomap_ops;
16 struct dax_device;
17 struct dax_operations {
18
19
20
21
22
23 long (*direct_access)(struct dax_device *, pgoff_t, long,
24 void **, pfn_t *);
25
26
27
28
29 bool (*dax_supported)(struct dax_device *, struct block_device *, int,
30 sector_t, sector_t);
31
32 size_t (*copy_from_iter)(struct dax_device *, pgoff_t, void *, size_t,
33 struct iov_iter *);
34
35 size_t (*copy_to_iter)(struct dax_device *, pgoff_t, void *, size_t,
36 struct iov_iter *);
37 };
38
39 extern struct attribute_group dax_attribute_group;
40
41 #if IS_ENABLED(CONFIG_DAX)
42 struct dax_device *dax_get_by_host(const char *host);
43 struct dax_device *alloc_dax(void *private, const char *host,
44 const struct dax_operations *ops, unsigned long flags);
45 void put_dax(struct dax_device *dax_dev);
46 void kill_dax(struct dax_device *dax_dev);
47 void dax_write_cache(struct dax_device *dax_dev, bool wc);
48 bool dax_write_cache_enabled(struct dax_device *dax_dev);
49 bool __dax_synchronous(struct dax_device *dax_dev);
50 static inline bool dax_synchronous(struct dax_device *dax_dev)
51 {
52 return __dax_synchronous(dax_dev);
53 }
54 void __set_dax_synchronous(struct dax_device *dax_dev);
55 static inline void set_dax_synchronous(struct dax_device *dax_dev)
56 {
57 __set_dax_synchronous(dax_dev);
58 }
59
60
61
62 static inline bool daxdev_mapping_supported(struct vm_area_struct *vma,
63 struct dax_device *dax_dev)
64 {
65 if (!(vma->vm_flags & VM_SYNC))
66 return true;
67 if (!IS_DAX(file_inode(vma->vm_file)))
68 return false;
69 return dax_synchronous(dax_dev);
70 }
71 #else
72 static inline struct dax_device *dax_get_by_host(const char *host)
73 {
74 return NULL;
75 }
76 static inline struct dax_device *alloc_dax(void *private, const char *host,
77 const struct dax_operations *ops, unsigned long flags)
78 {
79
80
81
82
83 return NULL;
84 }
85 static inline void put_dax(struct dax_device *dax_dev)
86 {
87 }
88 static inline void kill_dax(struct dax_device *dax_dev)
89 {
90 }
91 static inline void dax_write_cache(struct dax_device *dax_dev, bool wc)
92 {
93 }
94 static inline bool dax_write_cache_enabled(struct dax_device *dax_dev)
95 {
96 return false;
97 }
98 static inline bool dax_synchronous(struct dax_device *dax_dev)
99 {
100 return true;
101 }
102 static inline void set_dax_synchronous(struct dax_device *dax_dev)
103 {
104 }
105 static inline bool daxdev_mapping_supported(struct vm_area_struct *vma,
106 struct dax_device *dax_dev)
107 {
108 return !(vma->vm_flags & VM_SYNC);
109 }
110 #endif
111
112 struct writeback_control;
113 int bdev_dax_pgoff(struct block_device *, sector_t, size_t, pgoff_t *pgoff);
114 #if IS_ENABLED(CONFIG_FS_DAX)
115 bool __bdev_dax_supported(struct block_device *bdev, int blocksize);
116 static inline bool bdev_dax_supported(struct block_device *bdev, int blocksize)
117 {
118 return __bdev_dax_supported(bdev, blocksize);
119 }
120
121 bool __generic_fsdax_supported(struct dax_device *dax_dev,
122 struct block_device *bdev, int blocksize, sector_t start,
123 sector_t sectors);
124 static inline bool generic_fsdax_supported(struct dax_device *dax_dev,
125 struct block_device *bdev, int blocksize, sector_t start,
126 sector_t sectors)
127 {
128 return __generic_fsdax_supported(dax_dev, bdev, blocksize, start,
129 sectors);
130 }
131
132 static inline struct dax_device *fs_dax_get_by_host(const char *host)
133 {
134 return dax_get_by_host(host);
135 }
136
137 static inline void fs_put_dax(struct dax_device *dax_dev)
138 {
139 put_dax(dax_dev);
140 }
141
142 struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev);
143 int dax_writeback_mapping_range(struct address_space *mapping,
144 struct block_device *bdev, struct writeback_control *wbc);
145
146 struct page *dax_layout_busy_page(struct address_space *mapping);
147 dax_entry_t dax_lock_page(struct page *page);
148 void dax_unlock_page(struct page *page, dax_entry_t cookie);
149 #else
150 static inline bool bdev_dax_supported(struct block_device *bdev,
151 int blocksize)
152 {
153 return false;
154 }
155
156 static inline bool generic_fsdax_supported(struct dax_device *dax_dev,
157 struct block_device *bdev, int blocksize, sector_t start,
158 sector_t sectors)
159 {
160 return false;
161 }
162
163 static inline struct dax_device *fs_dax_get_by_host(const char *host)
164 {
165 return NULL;
166 }
167
168 static inline void fs_put_dax(struct dax_device *dax_dev)
169 {
170 }
171
172 static inline struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev)
173 {
174 return NULL;
175 }
176
177 static inline struct page *dax_layout_busy_page(struct address_space *mapping)
178 {
179 return NULL;
180 }
181
182 static inline int dax_writeback_mapping_range(struct address_space *mapping,
183 struct block_device *bdev, struct writeback_control *wbc)
184 {
185 return -EOPNOTSUPP;
186 }
187
188 static inline dax_entry_t dax_lock_page(struct page *page)
189 {
190 if (IS_DAX(page->mapping->host))
191 return ~0UL;
192 return 0;
193 }
194
195 static inline void dax_unlock_page(struct page *page, dax_entry_t cookie)
196 {
197 }
198 #endif
199
200 int dax_read_lock(void);
201 void dax_read_unlock(int id);
202 bool dax_alive(struct dax_device *dax_dev);
203 void *dax_get_private(struct dax_device *dax_dev);
204 long dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages,
205 void **kaddr, pfn_t *pfn);
206 bool dax_supported(struct dax_device *dax_dev, struct block_device *bdev,
207 int blocksize, sector_t start, sector_t len);
208 size_t dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr,
209 size_t bytes, struct iov_iter *i);
210 size_t dax_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr,
211 size_t bytes, struct iov_iter *i);
212 void dax_flush(struct dax_device *dax_dev, void *addr, size_t size);
213
214 ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter,
215 const struct iomap_ops *ops);
216 vm_fault_t dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
217 pfn_t *pfnp, int *errp, const struct iomap_ops *ops);
218 vm_fault_t dax_finish_sync_fault(struct vm_fault *vmf,
219 enum page_entry_size pe_size, pfn_t pfn);
220 int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
221 int dax_invalidate_mapping_entry_sync(struct address_space *mapping,
222 pgoff_t index);
223
224 #ifdef CONFIG_FS_DAX
225 int __dax_zero_page_range(struct block_device *bdev,
226 struct dax_device *dax_dev, sector_t sector,
227 unsigned int offset, unsigned int length);
228 #else
229 static inline int __dax_zero_page_range(struct block_device *bdev,
230 struct dax_device *dax_dev, sector_t sector,
231 unsigned int offset, unsigned int length)
232 {
233 return -ENXIO;
234 }
235 #endif
236
237 static inline bool dax_mapping(struct address_space *mapping)
238 {
239 return mapping->host && IS_DAX(mapping->host);
240 }
241
242 #endif