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#include <stdlib.h>
#include <assert.h>
#include "fio.h"
#include "flist.h"
#include "hash.h"
#include "filehash.h"
#include "smalloc.h"
#include "lib/bloom.h"
#define HASH_BUCKETS 512
#define HASH_MASK (HASH_BUCKETS - 1)
#define BLOOM_SIZE 16*1024*1024
static unsigned int file_hash_size = HASH_BUCKETS * sizeof(struct flist_head);
static struct flist_head *file_hash;
static struct fio_sem *hash_lock;
static struct bloom *file_bloom;
static unsigned short hash(const char *name)
{
return jhash(name, strlen(name), 0) & HASH_MASK;
}
void fio_file_hash_lock(void)
{
if (hash_lock)
fio_sem_down(hash_lock);
}
void fio_file_hash_unlock(void)
{
if (hash_lock)
fio_sem_up(hash_lock);
}
void remove_file_hash(struct fio_file *f)
{
fio_sem_down(hash_lock);
if (fio_file_hashed(f)) {
assert(!flist_empty(&f->hash_list));
flist_del_init(&f->hash_list);
fio_file_clear_hashed(f);
}
fio_sem_up(hash_lock);
}
static struct fio_file *__lookup_file_hash(const char *name)
{
struct flist_head *bucket = &file_hash[hash(name)];
struct flist_head *n;
flist_for_each(n, bucket) {
struct fio_file *f = flist_entry(n, struct fio_file, hash_list);
if (!f->file_name)
continue;
if (!strcmp(f->file_name, name))
return f;
}
return NULL;
}
struct fio_file *lookup_file_hash(const char *name)
{
struct fio_file *f;
fio_sem_down(hash_lock);
f = __lookup_file_hash(name);
fio_sem_up(hash_lock);
return f;
}
struct fio_file *add_file_hash(struct fio_file *f)
{
struct fio_file *alias;
if (fio_file_hashed(f))
return NULL;
INIT_FLIST_HEAD(&f->hash_list);
fio_sem_down(hash_lock);
alias = __lookup_file_hash(f->file_name);
if (!alias) {
fio_file_set_hashed(f);
flist_add_tail(&f->hash_list, &file_hash[hash(f->file_name)]);
}
fio_sem_up(hash_lock);
return alias;
}
bool file_bloom_exists(const char *fname, bool set)
{
return bloom_string(file_bloom, fname, strlen(fname), set);
}
void file_hash_exit(void)
{
unsigned int i, has_entries = 0;
fio_sem_down(hash_lock);
for (i = 0; i < HASH_BUCKETS; i++)
has_entries += !flist_empty(&file_hash[i]);
fio_sem_up(hash_lock);
if (has_entries)
log_err("fio: file hash not empty on exit\n");
sfree(file_hash);
file_hash = NULL;
fio_sem_remove(hash_lock);
hash_lock = NULL;
bloom_free(file_bloom);
file_bloom = NULL;
}
void file_hash_init(void)
{
unsigned int i;
file_hash = smalloc(file_hash_size);
for (i = 0; i < HASH_BUCKETS; i++)
INIT_FLIST_HEAD(&file_hash[i]);
hash_lock = fio_sem_init(FIO_SEM_UNLOCKED);
file_bloom = bloom_new(BLOOM_SIZE);
}
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