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