| #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 (!f->file_name) |
| continue; |
| |
| 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); |
| } |