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014bb1de N |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _MM_SWAP_H | |
3 | #define _MM_SWAP_H | |
4 | ||
5 | #ifdef CONFIG_SWAP | |
6 | #include <linux/blk_types.h> /* for bio_end_io_t */ | |
7 | ||
8 | /* linux/mm/page_io.c */ | |
e1209d3a | 9 | int sio_pool_init(void); |
5169b844 N |
10 | struct swap_iocb; |
11 | int swap_readpage(struct page *page, bool do_poll, | |
12 | struct swap_iocb **plug); | |
13 | void __swap_read_unplug(struct swap_iocb *plug); | |
14 | static inline void swap_read_unplug(struct swap_iocb *plug) | |
15 | { | |
16 | if (unlikely(plug)) | |
17 | __swap_read_unplug(plug); | |
18 | } | |
2282679f | 19 | void swap_write_unplug(struct swap_iocb *sio); |
014bb1de N |
20 | int swap_writepage(struct page *page, struct writeback_control *wbc); |
21 | void end_swap_bio_write(struct bio *bio); | |
22 | int __swap_writepage(struct page *page, struct writeback_control *wbc, | |
23 | bio_end_io_t end_write_func); | |
24 | ||
25 | /* linux/mm/swap_state.c */ | |
26 | /* One swap address space for each 64M swap space */ | |
27 | #define SWAP_ADDRESS_SPACE_SHIFT 14 | |
28 | #define SWAP_ADDRESS_SPACE_PAGES (1 << SWAP_ADDRESS_SPACE_SHIFT) | |
29 | extern struct address_space *swapper_spaces[]; | |
30 | #define swap_address_space(entry) \ | |
31 | (&swapper_spaces[swp_type(entry)][swp_offset(entry) \ | |
32 | >> SWAP_ADDRESS_SPACE_SHIFT]) | |
33 | ||
34 | void show_swap_cache_info(void); | |
09c02e56 | 35 | bool add_to_swap(struct folio *folio); |
014bb1de N |
36 | void *get_shadow_from_swap_cache(swp_entry_t entry); |
37 | int add_to_swap_cache(struct page *page, swp_entry_t entry, | |
38 | gfp_t gfp, void **shadowp); | |
ceff9d33 | 39 | void __delete_from_swap_cache(struct folio *folio, |
014bb1de | 40 | swp_entry_t entry, void *shadow); |
75fa68a5 | 41 | void delete_from_swap_cache(struct folio *folio); |
014bb1de N |
42 | void clear_shadow_from_swap_cache(int type, unsigned long begin, |
43 | unsigned long end); | |
014bb1de N |
44 | struct page *lookup_swap_cache(swp_entry_t entry, |
45 | struct vm_area_struct *vma, | |
46 | unsigned long addr); | |
47 | struct page *find_get_incore_page(struct address_space *mapping, pgoff_t index); | |
48 | ||
49 | struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask, | |
50 | struct vm_area_struct *vma, | |
51 | unsigned long addr, | |
5169b844 N |
52 | bool do_poll, |
53 | struct swap_iocb **plug); | |
014bb1de N |
54 | struct page *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask, |
55 | struct vm_area_struct *vma, | |
56 | unsigned long addr, | |
57 | bool *new_page_allocated); | |
58 | struct page *swap_cluster_readahead(swp_entry_t entry, gfp_t flag, | |
59 | struct vm_fault *vmf); | |
60 | struct page *swapin_readahead(swp_entry_t entry, gfp_t flag, | |
61 | struct vm_fault *vmf); | |
62 | ||
b98c359f | 63 | static inline unsigned int folio_swap_flags(struct folio *folio) |
d791ea67 | 64 | { |
b98c359f | 65 | return page_swap_info(&folio->page)->flags; |
d791ea67 | 66 | } |
014bb1de | 67 | #else /* CONFIG_SWAP */ |
5169b844 N |
68 | struct swap_iocb; |
69 | static inline int swap_readpage(struct page *page, bool do_poll, | |
70 | struct swap_iocb **plug) | |
014bb1de N |
71 | { |
72 | return 0; | |
73 | } | |
2282679f N |
74 | static inline void swap_write_unplug(struct swap_iocb *sio) |
75 | { | |
76 | } | |
014bb1de N |
77 | |
78 | static inline struct address_space *swap_address_space(swp_entry_t entry) | |
79 | { | |
80 | return NULL; | |
81 | } | |
82 | ||
014bb1de N |
83 | static inline void show_swap_cache_info(void) |
84 | { | |
85 | } | |
86 | ||
87 | static inline struct page *swap_cluster_readahead(swp_entry_t entry, | |
88 | gfp_t gfp_mask, struct vm_fault *vmf) | |
89 | { | |
90 | return NULL; | |
91 | } | |
92 | ||
93 | static inline struct page *swapin_readahead(swp_entry_t swp, gfp_t gfp_mask, | |
94 | struct vm_fault *vmf) | |
95 | { | |
96 | return NULL; | |
97 | } | |
98 | ||
99 | static inline int swap_writepage(struct page *p, struct writeback_control *wbc) | |
100 | { | |
101 | return 0; | |
102 | } | |
103 | ||
104 | static inline struct page *lookup_swap_cache(swp_entry_t swp, | |
105 | struct vm_area_struct *vma, | |
106 | unsigned long addr) | |
107 | { | |
108 | return NULL; | |
109 | } | |
110 | ||
111 | static inline | |
112 | struct page *find_get_incore_page(struct address_space *mapping, pgoff_t index) | |
113 | { | |
114 | return find_get_page(mapping, index); | |
115 | } | |
116 | ||
09c02e56 | 117 | static inline bool add_to_swap(struct folio *folio) |
014bb1de | 118 | { |
09c02e56 | 119 | return false; |
014bb1de N |
120 | } |
121 | ||
122 | static inline void *get_shadow_from_swap_cache(swp_entry_t entry) | |
123 | { | |
124 | return NULL; | |
125 | } | |
126 | ||
127 | static inline int add_to_swap_cache(struct page *page, swp_entry_t entry, | |
128 | gfp_t gfp_mask, void **shadowp) | |
129 | { | |
130 | return -1; | |
131 | } | |
132 | ||
ceff9d33 | 133 | static inline void __delete_from_swap_cache(struct folio *folio, |
014bb1de N |
134 | swp_entry_t entry, void *shadow) |
135 | { | |
136 | } | |
137 | ||
75fa68a5 | 138 | static inline void delete_from_swap_cache(struct folio *folio) |
014bb1de N |
139 | { |
140 | } | |
141 | ||
142 | static inline void clear_shadow_from_swap_cache(int type, unsigned long begin, | |
143 | unsigned long end) | |
144 | { | |
145 | } | |
146 | ||
b98c359f | 147 | static inline unsigned int folio_swap_flags(struct folio *folio) |
d791ea67 N |
148 | { |
149 | return 0; | |
150 | } | |
014bb1de N |
151 | #endif /* CONFIG_SWAP */ |
152 | #endif /* _MM_SWAP_H */ |