Ingo Weinhold
a38a92c955
Doesn't do anything ATM, but already provides the required system interface (VFS, caches, POSIX functions). git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20859 a95241bf-73f2-0310-859d-f6bbb57e9c96
92 lines
2.0 KiB
C++
92 lines
2.0 KiB
C++
/*
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* Copyright 2004-2006, Axel Dörfler, [email protected]. All rights reserved.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _FSSH_BLOCK_CACHE_PRIVATE_H
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#define _FSSH_BLOCK_CACHE_PRIVATE_H
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#include "DoublyLinkedList.h"
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#include "lock.h"
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namespace FSShell {
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struct hash_table;
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struct vm_page;
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//#define DEBUG_CHANGED
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#undef DEBUG_CHANGED
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struct cache_transaction;
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struct cached_block;
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struct block_cache;
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typedef DoublyLinkedListLink<cached_block> block_link;
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struct cached_block {
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cached_block *next; // next in hash
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cached_block *transaction_next;
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block_link link;
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fssh_off_t block_number;
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void *current_data;
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void *original_data;
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void *parent_data;
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#ifdef DEBUG_CHANGED
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void *compare;
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#endif
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int32_t ref_count;
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int32_t accessed;
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bool busy : 1;
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bool is_writing : 1;
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bool is_dirty : 1;
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bool unused : 1;
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bool unmapped : 1;
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cache_transaction *transaction;
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cache_transaction *previous_transaction;
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static int Compare(void *_cacheEntry, const void *_block);
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static uint32_t Hash(void *_cacheEntry, const void *_block, uint32_t range);
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};
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typedef DoublyLinkedList<cached_block,
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DoublyLinkedListMemberGetLink<cached_block,
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&cached_block::link> > block_list;
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struct block_cache {
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hash_table *hash;
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benaphore lock;
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int fd;
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fssh_off_t max_blocks;
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fssh_size_t block_size;
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int32_t allocated_block_count;
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int32_t next_transaction_id;
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cache_transaction *last_transaction;
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hash_table *transaction_hash;
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block_list unmapped_blocks;
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block_list unused_blocks;
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bool read_only;
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block_cache(int fd, fssh_off_t numBlocks, fssh_size_t blockSize, bool readOnly);
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~block_cache();
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fssh_status_t InitCheck();
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void RemoveUnusedBlocks(int32_t maxAccessed = LONG_MAX, int32_t count = LONG_MAX);
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void FreeBlock(cached_block *block);
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cached_block *NewBlock(fssh_off_t blockNumber);
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void Free(void *address);
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void *Allocate();
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static void LowMemoryHandler(void *data, int32_t level);
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};
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} // namespace FSShell
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#endif /* _FSSH_BLOCK_CACHE_PRIVATE_H */
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