41 lines
2.2 KiB
Plaintext
41 lines
2.2 KiB
Plaintext
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Variables
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static void *page_cache_table
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static spinlock_t page_cache_table_lock
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static int page_compare_func(void *_p, const void *_key)
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Compares a vm_page's cache_ref and offset to those of key. Returns 0 on match, -1 otherwise.
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static unsigned int page_hash_func(void *_p, const void *_key, unsigned int range)
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If p is not null, use it otherwise use key; computes a hash value for offset and reference.
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int vm_cache_init(kernel_args *ka)
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Calls hash_init, sets page_cache_table_lock to unlocked and returns 0.
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vm_cache *vm_cache_create(vm_store *store)
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Allocates a vm_cache structure and populates with 0's and NULLs (except for store).
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vm_cache_ref *vm_cache_ref_create(vm_cache *cache)
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Allocates a vm_cache_ref, setting it to point to the passed in cache. It initalizes the references lock and returns.
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void vm_cache_acquire_ref(vm_cache_ref *cache_ref, bool acquire_store_ref)
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If the cache_ref is null, panic. Otherwise, if we are to aquire a reference and there is an aquire reference function for this cache's store, call that function. Finally, increment this cache references' count.
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void vm_cache_release_ref(vm_cache_ref *cache_ref)
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If this cache_ref is the last reference to its cache, we call destroy on the store, remove all of its pages from the page_cache_table and set the state of them to free, increase max_commit by the size of the now freed storage, remove the reference to the original cache, destroy the reference's mutex and its space.
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Otherwise, we call the store's release ref and return.
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vm_page *vm_cache_lookup_page(vm_cache_ref *cache_ref, off_t offset)
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Lock the page_cache_table_lock and lookup the offset and cache_ref in the page_cache_table, then unlock.
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void vm_cache_insert_page(vm_cache_ref *cache_ref, vm_page *page, off_t offset)
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Add this page to the page_cache_table.
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void vm_cache_remove_page(vm_cache_ref *cache_ref, vm_page *page)
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Find this page and remove it from the hash list. Clean up the linked lists.
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int vm_cache_insert_region(vm_cache_ref *cache_ref, vm_region *region)
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Add this region to the cache_ref's region list.
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int vm_cache_remove_region(vm_cache_ref *cache_ref, vm_region *region)
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Remove this region from the cache_ref's region list.
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