3d268eda3d
that can be used by file systems.
* Changed the way the file cache works: instead of reading/writing to the
underlying device directly, it can now be used for any data source, ie.
also network file systems.
* As a result, the former pages_io() moved to the VFS layer, and can now be
called by a file system via {read|write}_file_io_vec_pages() (naming
suggestions are always welcomed :-)). It now gets an FD, and uses that to
communicate with the device (via its fs_{read|write}_pages() hooks).
* The file_cache_{read|write}() functions must now be called without holding
an I/O relevant file system lock. That allows the file cache to prepare the
pages without colliding with the page writer, IOW the "mayBlock" flag can
go into the attic again (yay!).
* This also results in a much better performance when the system does I/O and
is low on memory, as the page writer can now finally write back some pages,
and that even without maxing out the CPU :)
* The API changes put slightly more burden on the fs_{read|write}_pages()
hooks, but in combination with the file_map it's still pretty straight
forward. It just will have to dispatch the call to the underlying device
directly, usually it will just call its fs_{read|write}_pages() hooks
via the above mentioned calls.
* Ported BFS and FAT to the new API, the latter has not been tested, though.
* Also ported the API changes to the fs_shell. I also completely removed its
file cache level page handling - the downside is that device access is no
longer cached (ie. depends on the host OS now), the upside is that the code
is greatly simplified.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22886 a95241bf-73f2-0310-859d-f6bbb57e9c96
101 lines
3.8 KiB
C
101 lines
3.8 KiB
C
/*
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* Copyright 2004-2007, 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 _FSSH_FS_CACHE_H
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#define _FSSH_FS_CACHE_H
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//! File System File and Block Caches
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#include "fssh_fs_interface.h"
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typedef void (*fssh_transaction_notification_hook)(int32_t id, 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_t fssh_cache_start_transaction(void *_cache);
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extern fssh_status_t fssh_cache_sync_transaction(void *_cache, int32_t id);
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extern fssh_status_t fssh_cache_end_transaction(void *_cache, int32_t id,
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fssh_transaction_notification_hook hook,
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void *data);
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extern fssh_status_t fssh_cache_abort_transaction(void *_cache, int32_t id);
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extern int32_t fssh_cache_detach_sub_transaction(void *_cache,
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int32_t id, fssh_transaction_notification_hook hook,
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void *data);
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extern fssh_status_t fssh_cache_abort_sub_transaction(void *_cache,
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int32_t id);
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extern fssh_status_t fssh_cache_start_sub_transaction(void *_cache,
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int32_t id);
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extern fssh_status_t fssh_cache_next_block_in_transaction(void *_cache,
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int32_t id, uint32_t *_cookie,
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fssh_off_t *_blockNumber, void **_data,
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void **_unchangedData);
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extern int32_t fssh_cache_blocks_in_transaction(void *_cache,
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int32_t id);
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extern int32_t fssh_cache_blocks_in_sub_transaction(void *_cache,
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int32_t id);
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/* block cache */
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extern void fssh_block_cache_delete(void *_cache, bool allowWrites);
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extern void * fssh_block_cache_create(int fd, fssh_off_t numBlocks,
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fssh_size_t blockSize, bool readOnly);
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extern fssh_status_t fssh_block_cache_sync(void *_cache);
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extern fssh_status_t fssh_block_cache_sync_etc(void *_cache,
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fssh_off_t blockNumber, fssh_size_t numBlocks);
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extern fssh_status_t fssh_block_cache_make_writable(void *_cache,
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fssh_off_t blockNumber, int32_t transaction);
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extern void * fssh_block_cache_get_writable_etc(void *_cache,
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fssh_off_t blockNumber, fssh_off_t base,
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fssh_off_t length, int32_t transaction);
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extern void * fssh_block_cache_get_writable(void *_cache,
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fssh_off_t blockNumber, int32_t transaction);
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extern void * fssh_block_cache_get_empty(void *_cache,
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fssh_off_t blockNumber, int32_t transaction);
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extern const void * fssh_block_cache_get_etc(void *_cache,
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fssh_off_t blockNumber, fssh_off_t base,
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fssh_off_t length);
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extern const void * fssh_block_cache_get(void *_cache,
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fssh_off_t blockNumber);
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extern fssh_status_t fssh_block_cache_set_dirty(void *_cache,
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fssh_off_t blockNumber, bool isDirty,
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int32_t transaction);
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extern void fssh_block_cache_put(void *_cache,
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fssh_off_t blockNumber);
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/* file cache */
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extern void * fssh_file_cache_create(fssh_mount_id mountID,
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fssh_vnode_id vnodeID, fssh_off_t size);
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extern void fssh_file_cache_delete(void *_cacheRef);
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extern fssh_status_t fssh_file_cache_set_size(void *_cacheRef,
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fssh_off_t size);
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extern fssh_status_t fssh_file_cache_sync(void *_cache);
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extern fssh_status_t fssh_file_cache_read(void *_cacheRef, void *cookie,
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fssh_off_t offset, void *bufferBase,
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fssh_size_t *_size);
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extern fssh_status_t fssh_file_cache_write(void *_cacheRef, void *cookie,
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fssh_off_t offset, const void *buffer,
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fssh_size_t *_size);
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/* file map */
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extern void * fssh_file_map_create(fssh_mount_id mountID,
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fssh_vnode_id vnodeID);
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extern void fssh_file_map_delete(void *_map);
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extern void fssh_file_map_set_size(void *_map, fssh_off_t size);
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extern void fssh_file_map_invalidate(void *_map, fssh_off_t offset,
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fssh_off_t size);
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extern fssh_status_t fssh_file_map_translate(void *_map, fssh_off_t offset,
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fssh_size_t size, struct fssh_file_io_vec *vecs,
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fssh_size_t *_count);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _FSSH_FS_CACHE_H */
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