vcache.c

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#include <core/system.h>
#include <fs/vcache.h>
 
MALLOC_DEFINE(M_VCACHE, "vcache", "vnode cache structure");

static int vcache_eq(void *_a, void *_b)
{
    struct vnode *a = (struct vnode *) _a;
    ino_t *b = (ino_t *) _b;
 
    return a->ino == *b;
}

void vcache_init(struct vcache *vcache)
{
    vcache->hashmap = hashmap_new(0, vcache_eq);
}

int vcache_insert(struct vcache *vcache, struct vnode *vnode)
{
    if (!vcache)
        return -EINVAL;
 
    if (!vcache->hashmap)
        vcache_init(vcache);
 
    hash_t hash = hashmap_digest(&vnode->ino, sizeof(vnode->ino));
    return hashmap_insert(vcache->hashmap, hash, vnode);
}

int vcache_remove(struct vcache *vcache, struct vnode *vnode)
{
    if (!vcache || !vcache->hashmap)
        return -1;
 
    hash_t hash = hashmap_digest(&vnode->ino, sizeof(ino_t));
 
    struct hashmap_node *node = hashmap_lookup(vcache->hashmap, hash, &vnode->ino);
 
    if (node) {
        hashmap_node_remove(vcache->hashmap, node);
        return 0;
    }
 
    return -1;
}

struct vnode *vcache_find(struct vcache *vcache, ino_t ino)
{
    if (!vcache || !vcache->hashmap)
        return NULL;
 
    hash_t hash = hashmap_digest(&ino, sizeof(ino));
 
    struct hashmap_node *node = hashmap_lookup(vcache->hashmap, hash, &ino);
 
    if (node) {
        return (struct vnode *) node->entry;
    }
 
    return NULL;
}