projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1507f512 MR |
1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
| 2 | #ifndef _LINUX_SECRETMEM_H | |
| 3 | #define _LINUX_SECRETMEM_H | |
| 4 | ||
| 5 | #ifdef CONFIG_SECRETMEM | |
| 6 | ||
| 7 | extern const struct address_space_operations secretmem_aops; | |
| 8 | ||
| 8f9ff2de | 9 | static inline bool folio_is_secretmem(struct folio *folio) |
| 1507f512 MR |
10 | { |
| 11 | struct address_space *mapping; | |
| 12 | ||
| 13 | /* | |
| 8f9ff2de MWO |
14 | * Using folio_mapping() is quite slow because of the actual call |
| 15 | * instruction. | |
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16 | * We know that secretmem pages are not compound and LRU so we can |
| 17 | * save a couple of cycles here. | |
| 18 | */ | |
| 8f9ff2de | 19 | if (folio_test_large(folio) || !folio_test_lru(folio)) |
| 1507f512 MR |
20 | return false; |
| 21 | ||
| 22 | mapping = (struct address_space *) | |
| 8f9ff2de | 23 | ((unsigned long)folio->mapping & ~PAGE_MAPPING_FLAGS); |
| 1507f512 | 24 | |
| 8f9ff2de | 25 | if (!mapping || mapping != folio->mapping) |
| 1507f512 MR |
26 | return false; |
| 27 | ||
| 28 | return mapping->a_ops == &secretmem_aops; | |
| 29 | } | |
| 30 | ||
| 31 | bool vma_is_secretmem(struct vm_area_struct *vma); | |
| 9a436f8f | 32 | bool secretmem_active(void); |
| 1507f512 MR |
33 | |
| 34 | #else | |
| 35 | ||
| 36 | static inline bool vma_is_secretmem(struct vm_area_struct *vma) | |
| 37 | { | |
| 38 | return false; | |
| 39 | } | |
| 40 | ||
| 8f9ff2de | 41 | static inline bool folio_is_secretmem(struct folio *folio) |
| 1507f512 MR |
42 | { |
| 43 | return false; | |
| 44 | } | |
| 45 | ||
| 9a436f8f MR |
46 | static inline bool secretmem_active(void) |
| 47 | { | |
| 48 | return false; | |
| 49 | } | |
| 50 | ||
| 1507f512 MR |
51 | #endif /* CONFIG_SECRETMEM */ |
| 52 | ||
| 53 | #endif /* _LINUX_SECRETMEM_H */ |