6d4aea4796
* Removed the vm_cache/vm_store ref_count duality that besides being a bit ugly also created the page dameon cache retrieval problem: now, only areas (and cache consumers) retrieve a reference to the store (and therefore, the vnode). The page daemon doesn't need to care about this at all anymore, and the pseudo references of the vm_cache could be removed again. * Rearranged deletion of vnodes such that its ID can be reused directly after fs_remove_vnode() has been called. * vm_page_allocate_page() no longer panics when it runs out of pages, but just waits for new pages to become available using the new sFreeCondition condition variable - to make sure this happens in an acceptable time frame, it'll trigger a run of the low memory handlers. * Implemented a page_thief() that steals inactive pages from caches and puts them into the free queue. It runs as a low memory handler. * The file cache now sets the usage count on the pages it inserts into the cache (needs some rework though, cache_io() doesn't do it yet). * Instead of panicking, the kernel will currently dead lock in low memory situations, since BFS does a bit too much in bfs_release_vnode(). * Some minor cleanup. git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22315 a95241bf-73f2-0310-859d-f6bbb57e9c96
57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
/*
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* Copyright 2004-2007, Axel Dörfler, axeld@pinc-software.de.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _KERNEL_FILE_CACHE_H
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#define _KERNEL_FILE_CACHE_H
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#include <vfs.h>
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#include <vm_types.h>
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#include <module.h>
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// temporary/optional cache syscall API
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#define CACHE_SYSCALLS "cache"
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#define CACHE_CLEAR 1 // takes no parameters
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#define CACHE_SET_MODULE 2 // gets the module name as parameter
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#define CACHE_MODULES_NAME "file_cache"
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#define FILE_CACHE_SEQUENTIAL_ACCESS 0x01
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#define FILE_CACHE_LOADED_COMPLETELY 0x02
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#define FILE_CACHE_NO_IO 0x04
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struct cache_module_info {
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module_info info;
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void (*node_opened)(void *vnode, int32 fdType, dev_t mountID, ino_t parentID,
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ino_t vnodeID, const char *name, off_t size);
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void (*node_closed)(void *vnode, int32 fdType, dev_t mountID, ino_t vnodeID,
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int32 accessType);
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void (*node_launched)(size_t argCount, char * const *args);
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};
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern void cache_node_opened(void *vnode, int32 fdType, vm_cache *cache,
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dev_t mountID, ino_t parentID, ino_t vnodeID, const char *name);
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extern void cache_node_closed(void *vnode, int32 fdType, vm_cache *cache,
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dev_t mountID, ino_t vnodeID);
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extern void cache_node_launched(size_t argCount, char * const *args);
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extern void cache_prefetch_vnode(void *vnode, off_t offset, size_t size);
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extern void cache_prefetch(dev_t mountID, ino_t vnodeID, off_t offset, size_t size);
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extern status_t file_cache_init_post_boot_device(void);
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extern status_t file_cache_init(void);
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extern vm_store *vm_create_vnode_store(struct vnode *vnode);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _KRENEL_FILE_CACHE_H */
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