blob: a00ac7885721c60b839f0b6c26144f6355b065a9 [file] [log] [blame]
#include <stdlib.h>
#include <assert.h>
#include "fio.h"
#include "flist.h"
#include "crc/crc16.h"
#define HASH_BUCKETS 512
#define HASH_MASK (HASH_BUCKETS - 1)
unsigned int file_hash_size = HASH_BUCKETS * sizeof(struct flist_head);
static struct flist_head *file_hash;
static struct fio_mutex *hash_lock;
static unsigned short hash(const char *name)
{
return crc16((const unsigned char *) name, strlen(name)) & HASH_MASK;
}
void remove_file_hash(struct fio_file *f)
{
fio_mutex_down(hash_lock);
if (f->flags & FIO_FILE_HASHED) {
assert(!flist_empty(&f->hash_list));
flist_del_init(&f->hash_list);
f->flags &= ~FIO_FILE_HASHED;
}
fio_mutex_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 (!strcmp(f->file_name, name)) {
assert(f->fd != -1);
return f;
}
}
return NULL;
}
struct fio_file *lookup_file_hash(const char *name)
{
struct fio_file *f;
fio_mutex_down(hash_lock);
f = __lookup_file_hash(name);
fio_mutex_up(hash_lock);
return f;
}
struct fio_file *add_file_hash(struct fio_file *f)
{
struct fio_file *alias;
if (f->flags & FIO_FILE_HASHED)
return NULL;
INIT_FLIST_HEAD(&f->hash_list);
fio_mutex_down(hash_lock);
alias = __lookup_file_hash(f->file_name);
if (!alias) {
f->flags |= FIO_FILE_HASHED;
flist_add_tail(&f->hash_list, &file_hash[hash(f->file_name)]);
}
fio_mutex_up(hash_lock);
return alias;
}
void file_hash_exit(void)
{
unsigned int i, has_entries = 0;
fio_mutex_down(hash_lock);
for (i = 0; i < HASH_BUCKETS; i++)
has_entries += !flist_empty(&file_hash[i]);
fio_mutex_up(hash_lock);
if (has_entries)
log_err("fio: file hash not empty on exit\n");
file_hash = NULL;
fio_mutex_remove(hash_lock);
hash_lock = NULL;
}
void file_hash_init(void *ptr)
{
unsigned int i;
file_hash = ptr;
for (i = 0; i < HASH_BUCKETS; i++)
INIT_FLIST_HEAD(&file_hash[i]);
hash_lock = fio_mutex_init(1);
}