bcache.h File Reference

#include <fs/vfs.h>
#include <ds/hashmap.h>

Go to the source code of this file.

Data Structures
struct	bcache
	A filesystem's block cache (fs/bcache.c): its blocks that were read, by their offset. More...

Functions
void	bcache_init (struct bcache *bcache)
	Sets up an empty block cache.
int	bcache_insert (struct bcache *bcache, uint64_t off, void *data)
	Adds a block to a cache, which keeps its memory from now on.
int	bcache_remove (struct bcache *bcache, uint64_t off)
	Takes a block out of a cache.
void *	bcache_find (struct bcache *bcache, uint64_t off)
	Finds a cached block.

Function Documentation

bcache_find()

void * bcache_find	(	struct bcache *	bcache,
		uint64_t	off )

Finds a cached block.

Parameters

bcache	the cache
off	the block's number

Returns

its contents, or NULL if it isn't cached

Definition at line 100 of file bcache.c.

References bcache_find(), cache_block::data, hashmap_node::entry, hashmap_node::hash, bcache::hashmap, and NULL.

Referenced by bcache_find(), and minix_bcache_get().

bcache_init()

void bcache_init

(

struct bcache *

bcache

)

Sets up an empty block cache.

Parameters

bcache

the cache

Definition at line 35 of file bcache.c.

References bcache_eq(), bcache_init(), and bcache::hashmap.

Referenced by bcache_init(), bcache_insert(), and minix_load().

bcache_insert()

int bcache_insert	(	struct bcache *	bcache,
		uint64_t	off,
		void *	data )

Adds a block to a cache, which keeps its memory from now on.

Parameters

bcache	the cache, set up on first use
off	the block's number
data	its contents

Returns

0, -EINVAL if bcache is NULL, or -ENOMEM

Definition at line 48 of file bcache.c.

References bcache_init(), bcache_insert(), cache_block::data, bcache::hashmap, kmalloc(), M_ZERO, and cache_block::off.

Referenced by bcache_insert(), and minix_bcache_get().

bcache_remove()

int bcache_remove	(	struct bcache *	bcache,
		uint64_t	off )

Takes a block out of a cache.

Parameters

bcache	the cache
off	the block's number

Returns

0, or -1 if the block wasn't cached

Definition at line 73 of file bcache.c.

References bcache_remove(), hashmap_node::entry, hashmap_node::hash, bcache::hashmap, kfree(), NULL, and cache_block::off.

Referenced by bcache_remove(), minix_block_free(), and table_alloc().