fio: fix aio trim completion latencies
[fio.git] / filehash.c
index b459220..b55ab73 100644 (file)
@@ -2,42 +2,63 @@
 #include <assert.h>
 
 #include "fio.h"
-#include "list.h"
-#include "crc/crc16.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)
 
-unsigned int file_hash_size = HASH_BUCKETS * sizeof(struct list_head);
+#define BLOOM_SIZE     16*1024*1024
 
-static struct list_head *file_hash;
-static struct fio_mutex *hash_lock;
+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 crc16((const unsigned char *) name, strlen(name)) & HASH_MASK;
+       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_mutex_down(hash_lock);
+       fio_sem_down(hash_lock);
 
-       if (f->flags & FIO_FILE_HASHED) {
-               assert(!list_empty(&f->hash_list));
-               list_del_init(&f->hash_list);
-               f->flags &= ~FIO_FILE_HASHED;
+       if (fio_file_hashed(f)) {
+               assert(!flist_empty(&f->hash_list));
+               flist_del_init(&f->hash_list);
+               fio_file_clear_hashed(f);
        }
 
-       fio_mutex_up(hash_lock);
+       fio_sem_up(hash_lock);
 }
 
 static struct fio_file *__lookup_file_hash(const char *name)
 {
-       struct list_head *bucket = &file_hash[hash(name)];
-       struct list_head *n;
+       struct flist_head *bucket = &file_hash[hash(name)];
+       struct flist_head *n;
 
-       list_for_each(n, bucket) {
-               struct fio_file *f = list_entry(n, struct fio_file, hash_list);
+       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);
@@ -52,9 +73,9 @@ struct fio_file *lookup_file_hash(const char *name)
 {
        struct fio_file *f;
 
-       fio_mutex_down(hash_lock);
+       fio_sem_down(hash_lock);
        f = __lookup_file_hash(name);
-       fio_mutex_up(hash_lock);
+       fio_sem_up(hash_lock);
        return f;
 }
 
@@ -62,30 +83,57 @@ struct fio_file *add_file_hash(struct fio_file *f)
 {
        struct fio_file *alias;
 
-       if (f->flags & FIO_FILE_HASHED)
+       if (fio_file_hashed(f))
                return NULL;
 
-       INIT_LIST_HEAD(&f->hash_list);
+       INIT_FLIST_HEAD(&f->hash_list);
 
-       fio_mutex_down(hash_lock);
+       fio_sem_down(hash_lock);
 
        alias = __lookup_file_hash(f->file_name);
        if (!alias) {
-               f->flags |= FIO_FILE_HASHED;
-               list_add_tail(&f->hash_list, &file_hash[hash(f->file_name)]);
+               fio_file_set_hashed(f);
+               flist_add_tail(&f->hash_list, &file_hash[hash(f->file_name)]);
        }
 
-       fio_mutex_up(hash_lock);
+       fio_sem_up(hash_lock);
        return alias;
 }
 
-void file_hash_init(void *ptr)
+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 = ptr;
+       file_hash = smalloc(file_hash_size);
+
        for (i = 0; i < HASH_BUCKETS; i++)
-               INIT_LIST_HEAD(&file_hash[i]);
+               INIT_FLIST_HEAD(&file_hash[i]);
 
-       hash_lock = fio_mutex_init(1);
+       hash_lock = fio_sem_init(FIO_SEM_UNLOCKED);
+       file_bloom = bloom_new(BLOOM_SIZE);
 }