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* Extracted file_map API out of the file cache - it's now an optional service

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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
This commit is contained in:
Axel Dörfler
2007-11-10 21:19:52 +00:00
parent 94463f5368
commit 3d268eda3d
36 changed files with 1339 additions and 2333 deletions
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headers/private/fs_shell/fssh_fs_cache.h
+16 -12
View File
@@ -69,26 +69,30 @@ extern void fssh_block_cache_put(void *_cache,
/* file cache */
extern void * fssh_file_cache_create(fssh_mount_id mountID,
fssh_vnode_id vnodeID, fssh_off_t size, int fd);
fssh_vnode_id vnodeID, fssh_off_t size);
extern void fssh_file_cache_delete(void *_cacheRef);
extern fssh_status_t fssh_file_cache_set_size(void *_cacheRef,
fssh_off_t size);
extern fssh_status_t fssh_file_cache_sync(void *_cache);
extern fssh_status_t fssh_file_cache_invalidate_file_map(void *_cacheRef,
fssh_off_t offset, fssh_off_t size);
extern fssh_status_t fssh_file_cache_read_pages(void *_cacheRef,
fssh_off_t offset, const fssh_iovec *vecs,
fssh_size_t count, fssh_size_t *_numBytes);
extern fssh_status_t fssh_file_cache_write_pages(void *_cacheRef,
fssh_off_t offset, const fssh_iovec *vecs,
fssh_size_t count, fssh_size_t *_numBytes);
extern fssh_status_t fssh_file_cache_read(void *_cacheRef, fssh_off_t offset,
void *bufferBase, fssh_size_t *_size);
extern fssh_status_t fssh_file_cache_write(void *_cacheRef,
extern fssh_status_t fssh_file_cache_read(void *_cacheRef, void *cookie,
fssh_off_t offset, void *bufferBase,
fssh_size_t *_size);
extern fssh_status_t fssh_file_cache_write(void *_cacheRef, void *cookie,
fssh_off_t offset, const void *buffer,
fssh_size_t *_size);
/* file map */
extern void * fssh_file_map_create(fssh_mount_id mountID,
fssh_vnode_id vnodeID);
extern void fssh_file_map_delete(void *_map);
extern void fssh_file_map_set_size(void *_map, fssh_off_t size);
extern void fssh_file_map_invalidate(void *_map, fssh_off_t offset,
fssh_off_t size);
extern fssh_status_t fssh_file_map_translate(void *_map, fssh_off_t offset,
fssh_size_t size, struct fssh_file_io_vec *vecs,
fssh_size_t *_count);
#ifdef __cplusplus
}
#endif