Commit | Line | Data |
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c94c2acf MW |
1 | #ifndef _LINUX_DAX_H |
2 | #define _LINUX_DAX_H | |
3 | ||
4 | #include <linux/fs.h> | |
5 | #include <linux/mm.h> | |
4f622938 | 6 | #include <linux/radix-tree.h> |
c94c2acf MW |
7 | #include <asm/pgtable.h> |
8 | ||
a254e568 | 9 | struct iomap_ops; |
6568b08b DW |
10 | struct dax_device; |
11 | struct dax_operations { | |
12 | /* | |
13 | * direct_access: translate a device-relative | |
14 | * logical-page-offset into an absolute physical pfn. Return the | |
15 | * number of pages available for DAX at that pfn. | |
16 | */ | |
17 | long (*direct_access)(struct dax_device *, pgoff_t, long, | |
18 | void **, pfn_t *); | |
19 | }; | |
a254e568 | 20 | |
7b6be844 DW |
21 | int dax_read_lock(void); |
22 | void dax_read_unlock(int id); | |
72058005 | 23 | struct dax_device *dax_get_by_host(const char *host); |
7b6be844 | 24 | |
fa28f729 | 25 | /* |
642261ac RZ |
26 | * We use lowest available bit in exceptional entry for locking, one bit for |
27 | * the entry size (PMD) and two more to tell us if the entry is a huge zero | |
28 | * page (HZP) or an empty entry that is just used for locking. In total four | |
29 | * special bits. | |
30 | * | |
31 | * If the PMD bit isn't set the entry has size PAGE_SIZE, and if the HZP and | |
32 | * EMPTY bits aren't set the entry is a normal DAX entry with a filesystem | |
33 | * block allocation. | |
fa28f729 | 34 | */ |
642261ac | 35 | #define RADIX_DAX_SHIFT (RADIX_TREE_EXCEPTIONAL_SHIFT + 4) |
e804315d | 36 | #define RADIX_DAX_ENTRY_LOCK (1 << RADIX_TREE_EXCEPTIONAL_SHIFT) |
642261ac RZ |
37 | #define RADIX_DAX_PMD (1 << (RADIX_TREE_EXCEPTIONAL_SHIFT + 1)) |
38 | #define RADIX_DAX_HZP (1 << (RADIX_TREE_EXCEPTIONAL_SHIFT + 2)) | |
39 | #define RADIX_DAX_EMPTY (1 << (RADIX_TREE_EXCEPTIONAL_SHIFT + 3)) | |
fa28f729 | 40 | |
642261ac RZ |
41 | static inline unsigned long dax_radix_sector(void *entry) |
42 | { | |
43 | return (unsigned long)entry >> RADIX_DAX_SHIFT; | |
44 | } | |
45 | ||
46 | static inline void *dax_radix_locked_entry(sector_t sector, unsigned long flags) | |
47 | { | |
48 | return (void *)(RADIX_TREE_EXCEPTIONAL_ENTRY | flags | | |
49 | ((unsigned long)sector << RADIX_DAX_SHIFT) | | |
50 | RADIX_DAX_ENTRY_LOCK); | |
51 | } | |
e804315d | 52 | |
11c59c92 | 53 | ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter, |
8ff6daa1 | 54 | const struct iomap_ops *ops); |
c791ace1 DJ |
55 | int dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size, |
56 | const struct iomap_ops *ops); | |
ac401cc7 | 57 | int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index); |
c6dcf52c JK |
58 | int dax_invalidate_mapping_entry(struct address_space *mapping, pgoff_t index); |
59 | int dax_invalidate_mapping_entry_sync(struct address_space *mapping, | |
60 | pgoff_t index); | |
ac401cc7 | 61 | void dax_wake_mapping_entry_waiter(struct address_space *mapping, |
63e95b5c | 62 | pgoff_t index, void *entry, bool wake_all); |
d1a5f2b4 DW |
63 | |
64 | #ifdef CONFIG_FS_DAX | |
65 | struct page *read_dax_sector(struct block_device *bdev, sector_t n); | |
679c8bd3 CH |
66 | int __dax_zero_page_range(struct block_device *bdev, sector_t sector, |
67 | unsigned int offset, unsigned int length); | |
d1a5f2b4 DW |
68 | #else |
69 | static inline struct page *read_dax_sector(struct block_device *bdev, | |
70 | sector_t n) | |
71 | { | |
72 | return ERR_PTR(-ENXIO); | |
73 | } | |
679c8bd3 CH |
74 | static inline int __dax_zero_page_range(struct block_device *bdev, |
75 | sector_t sector, unsigned int offset, unsigned int length) | |
76 | { | |
77 | return -ENXIO; | |
78 | } | |
d1a5f2b4 DW |
79 | #endif |
80 | ||
642261ac RZ |
81 | #ifdef CONFIG_FS_DAX_PMD |
82 | static inline unsigned int dax_radix_order(void *entry) | |
83 | { | |
84 | if ((unsigned long)entry & RADIX_DAX_PMD) | |
85 | return PMD_SHIFT - PAGE_SHIFT; | |
86 | return 0; | |
87 | } | |
642261ac RZ |
88 | #else |
89 | static inline unsigned int dax_radix_order(void *entry) | |
90 | { | |
91 | return 0; | |
92 | } | |
642261ac | 93 | #endif |
11bac800 | 94 | int dax_pfn_mkwrite(struct vm_fault *vmf); |
c94c2acf | 95 | |
4897c765 MW |
96 | static inline bool vma_is_dax(struct vm_area_struct *vma) |
97 | { | |
98 | return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host); | |
99 | } | |
f9fe48be RZ |
100 | |
101 | static inline bool dax_mapping(struct address_space *mapping) | |
102 | { | |
103 | return mapping->host && IS_DAX(mapping->host); | |
104 | } | |
7f6d5b52 RZ |
105 | |
106 | struct writeback_control; | |
107 | int dax_writeback_mapping_range(struct address_space *mapping, | |
108 | struct block_device *bdev, struct writeback_control *wbc); | |
c94c2acf | 109 | #endif |