4612433715
vector at the end of the file will be aligned to the given value. * BFS uses an alignment of 512 bytes (should be block size of the underlying device or BFS block size, whatever is less), which should be fine, since file data are only stored in BFS blocks. This totally avoids any partial operations at the I/O scheduler level, thus saving disk operations. Not that I could measure any performance difference. Theoretically it should help a lot though, particularly when dealing with lots of small files, since we avoid using bounce buffers, which are (a) limited in number and (b) require copying of the data. git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27246 a95241bf-73f2-0310-859d-f6bbb57e9c96
107 lines
4.0 KiB
C
107 lines
4.0 KiB
C
/*
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* Copyright 2004-2008, Haiku Inc. All Rights Reserved.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _FS_CACHE_H
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#define _FS_CACHE_H
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/*! File System File and Block Caches */
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#include <fs_interface.h>
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/* transaction events */
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enum {
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TRANSACTION_WRITTEN = 0x01,
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TRANSACTION_ABORTED = 0x02,
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TRANSACTION_ENDED = 0x04,
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TRANSACTION_IDLE = 0x08
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};
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/* file map modes */
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enum {
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FILE_MAP_CACHE_ON_DEMAND = 0x01, /* default mode */
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FILE_MAP_CACHE_ALL = 0x02
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};
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typedef void (*transaction_notification_hook)(int32 id, int32 event,
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void *data);
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* transactions */
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extern int32 cache_start_transaction(void *_cache);
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extern status_t cache_sync_transaction(void *_cache, int32 id);
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extern status_t cache_end_transaction(void *_cache, int32 id,
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transaction_notification_hook hook, void *data);
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extern status_t cache_abort_transaction(void *_cache, int32 id);
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extern int32 cache_detach_sub_transaction(void *_cache, int32 id,
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transaction_notification_hook hook, void *data);
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extern status_t cache_abort_sub_transaction(void *_cache, int32 id);
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extern status_t cache_start_sub_transaction(void *_cache, int32 id);
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extern status_t cache_add_transaction_listener(void *_cache, int32 id,
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int32 events, transaction_notification_hook hook,
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void *data);
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extern status_t cache_remove_transaction_listener(void *_cache, int32 id,
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transaction_notification_hook hook, void *data);
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extern status_t cache_next_block_in_transaction(void *_cache, int32 id,
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bool mainOnly, long *_cookie, off_t *_blockNumber,
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void **_data, void **_unchangedData);
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extern int32 cache_blocks_in_transaction(void *_cache, int32 id);
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extern int32 cache_blocks_in_main_transaction(void *_cache, int32 id);
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extern int32 cache_blocks_in_sub_transaction(void *_cache, int32 id);
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/* block cache */
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extern void block_cache_delete(void *_cache, bool allowWrites);
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extern void *block_cache_create(int fd, off_t numBlocks, size_t blockSize,
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bool readOnly);
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extern status_t block_cache_sync(void *_cache);
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extern status_t block_cache_sync_etc(void *_cache, off_t blockNumber,
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size_t numBlocks);
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extern status_t block_cache_make_writable(void *_cache, off_t blockNumber,
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int32 transaction);
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extern void *block_cache_get_writable_etc(void *_cache, off_t blockNumber,
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off_t base, off_t length, int32 transaction);
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extern void *block_cache_get_writable(void *_cache, off_t blockNumber,
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int32 transaction);
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extern void *block_cache_get_empty(void *_cache, off_t blockNumber,
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int32 transaction);
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extern const void *block_cache_get_etc(void *_cache, off_t blockNumber,
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off_t base, off_t length);
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extern const void *block_cache_get(void *_cache, off_t blockNumber);
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extern status_t block_cache_set_dirty(void *_cache, off_t blockNumber,
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bool isDirty, int32 transaction);
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extern void block_cache_put(void *_cache, off_t blockNumber);
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/* file cache */
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extern void *file_cache_create(dev_t mountID, ino_t vnodeID, off_t size);
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extern void file_cache_delete(void *_cacheRef);
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extern void file_cache_enable(void *_cacheRef);
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extern bool file_cache_is_enabled(void *_cacheRef);
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extern status_t file_cache_disable(void *_cacheRef);
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extern status_t file_cache_set_size(void *_cacheRef, off_t size);
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extern status_t file_cache_sync(void *_cache);
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extern status_t file_cache_read(void *_cacheRef, void *cookie, off_t offset,
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void *bufferBase, size_t *_size);
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extern status_t file_cache_write(void *_cacheRef, void *cookie, off_t offset,
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const void *buffer, size_t *_size);
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/* file map */
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extern void *file_map_create(dev_t mountID, ino_t vnodeID, off_t size);
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extern void file_map_delete(void *_map);
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extern void file_map_set_size(void *_map, off_t size);
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extern void file_map_invalidate(void *_map, off_t offset, off_t size);
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extern status_t file_map_set_mode(void *_map, uint32 mode);
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extern status_t file_map_translate(void *_map, off_t offset, size_t size,
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struct file_io_vec *vecs, size_t *_count, size_t align);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _FS_CACHE_H */
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