Commit | Line | Data |
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014bb1de N |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _MM_SWAP_H | |
3 | #define _MM_SWAP_H | |
4 | ||
ddc1a5cb HD |
5 | struct mempolicy; |
6 | ||
014bb1de N |
7 | #ifdef CONFIG_SWAP |
8 | #include <linux/blk_types.h> /* for bio_end_io_t */ | |
9 | ||
10 | /* linux/mm/page_io.c */ | |
e1209d3a | 11 | int sio_pool_init(void); |
5169b844 | 12 | struct swap_iocb; |
c9bdf768 MWO |
13 | void swap_read_folio(struct folio *folio, bool do_poll, |
14 | struct swap_iocb **plug); | |
5169b844 N |
15 | void __swap_read_unplug(struct swap_iocb *plug); |
16 | static inline void swap_read_unplug(struct swap_iocb *plug) | |
17 | { | |
18 | if (unlikely(plug)) | |
19 | __swap_read_unplug(plug); | |
20 | } | |
2282679f | 21 | void swap_write_unplug(struct swap_iocb *sio); |
014bb1de | 22 | int swap_writepage(struct page *page, struct writeback_control *wbc); |
b99b4e0d | 23 | void __swap_writepage(struct folio *folio, struct writeback_control *wbc); |
014bb1de N |
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 | 36 | void *get_shadow_from_swap_cache(swp_entry_t entry); |
a4c366f0 | 37 | int add_to_swap_cache(struct folio *folio, swp_entry_t entry, |
014bb1de | 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); | |
13ddaf26 | 44 | void swapcache_clear(struct swap_info_struct *si, swp_entry_t entry); |
c9edc242 MWO |
45 | struct folio *swap_cache_get_folio(swp_entry_t entry, |
46 | struct vm_area_struct *vma, unsigned long addr); | |
524984ff MWO |
47 | struct folio *filemap_get_incore_folio(struct address_space *mapping, |
48 | pgoff_t index); | |
014bb1de | 49 | |
6e03492e MWO |
50 | struct folio *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask, |
51 | struct vm_area_struct *vma, unsigned long addr, | |
52 | struct swap_iocb **plug); | |
96c7b0b4 MWO |
53 | struct folio *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_flags, |
54 | struct mempolicy *mpol, pgoff_t ilx, bool *new_page_allocated, | |
55 | bool skip_if_exists); | |
a4575c41 MWO |
56 | struct folio *swap_cluster_readahead(swp_entry_t entry, gfp_t flag, |
57 | struct mempolicy *mpol, pgoff_t ilx); | |
014bb1de N |
58 | struct page *swapin_readahead(swp_entry_t entry, gfp_t flag, |
59 | struct vm_fault *vmf); | |
60 | ||
b98c359f | 61 | static inline unsigned int folio_swap_flags(struct folio *folio) |
d791ea67 | 62 | { |
69fe7d67 | 63 | return swp_swap_info(folio->swap)->flags; |
d791ea67 | 64 | } |
014bb1de | 65 | #else /* CONFIG_SWAP */ |
5169b844 | 66 | struct swap_iocb; |
c9bdf768 | 67 | static inline void swap_read_folio(struct folio *folio, bool do_poll, |
a8c1408f | 68 | struct swap_iocb **plug) |
014bb1de | 69 | { |
014bb1de | 70 | } |
2282679f N |
71 | static inline void swap_write_unplug(struct swap_iocb *sio) |
72 | { | |
73 | } | |
014bb1de N |
74 | |
75 | static inline struct address_space *swap_address_space(swp_entry_t entry) | |
76 | { | |
77 | return NULL; | |
78 | } | |
79 | ||
014bb1de N |
80 | static inline void show_swap_cache_info(void) |
81 | { | |
82 | } | |
83 | ||
a4575c41 | 84 | static inline struct folio *swap_cluster_readahead(swp_entry_t entry, |
ddc1a5cb | 85 | gfp_t gfp_mask, struct mempolicy *mpol, pgoff_t ilx) |
014bb1de N |
86 | { |
87 | return NULL; | |
88 | } | |
89 | ||
90 | static inline struct page *swapin_readahead(swp_entry_t swp, gfp_t gfp_mask, | |
91 | struct vm_fault *vmf) | |
92 | { | |
93 | return NULL; | |
94 | } | |
95 | ||
96 | static inline int swap_writepage(struct page *p, struct writeback_control *wbc) | |
97 | { | |
98 | return 0; | |
99 | } | |
100 | ||
13ddaf26 KS |
101 | static inline void swapcache_clear(struct swap_info_struct *si, swp_entry_t entry) |
102 | { | |
103 | } | |
104 | ||
c9edc242 MWO |
105 | static inline struct folio *swap_cache_get_folio(swp_entry_t entry, |
106 | struct vm_area_struct *vma, unsigned long addr) | |
107 | { | |
108 | return NULL; | |
109 | } | |
110 | ||
014bb1de | 111 | static inline |
524984ff MWO |
112 | struct folio *filemap_get_incore_folio(struct address_space *mapping, |
113 | pgoff_t index) | |
014bb1de | 114 | { |
524984ff | 115 | return filemap_get_folio(mapping, index); |
014bb1de N |
116 | } |
117 | ||
09c02e56 | 118 | static inline bool add_to_swap(struct folio *folio) |
014bb1de | 119 | { |
09c02e56 | 120 | return false; |
014bb1de N |
121 | } |
122 | ||
123 | static inline void *get_shadow_from_swap_cache(swp_entry_t entry) | |
124 | { | |
125 | return NULL; | |
126 | } | |
127 | ||
a4c366f0 | 128 | static inline int add_to_swap_cache(struct folio *folio, swp_entry_t entry, |
014bb1de N |
129 | gfp_t gfp_mask, void **shadowp) |
130 | { | |
131 | return -1; | |
132 | } | |
133 | ||
ceff9d33 | 134 | static inline void __delete_from_swap_cache(struct folio *folio, |
014bb1de N |
135 | swp_entry_t entry, void *shadow) |
136 | { | |
137 | } | |
138 | ||
75fa68a5 | 139 | static inline void delete_from_swap_cache(struct folio *folio) |
014bb1de N |
140 | { |
141 | } | |
142 | ||
143 | static inline void clear_shadow_from_swap_cache(int type, unsigned long begin, | |
144 | unsigned long end) | |
145 | { | |
146 | } | |
147 | ||
b98c359f | 148 | static inline unsigned int folio_swap_flags(struct folio *folio) |
d791ea67 N |
149 | { |
150 | return 0; | |
151 | } | |
014bb1de N |
152 | #endif /* CONFIG_SWAP */ |
153 | #endif /* _MM_SWAP_H */ |