Add support for non-uniformly random file service type

[fio.git] / file.h

diff --git a/file.h b/file.h
index 22ec742fc1bc47deb22d5552202100b3ea042717..0cf622fcbb213a7922ecb96a8e7b7f88bd76b2f2 100644 (file)
--- a/file.h
+++ b/file.h
@@ -39,13 +39,20 @@ enum file_lock_mode {
 };
 
 /*
- * roundrobin available files, or choose one at random, or do each one
- * serially.
+ * How fio chooses what file to service next. Choice of uniformly random, or
+ * some skewed random variants, or just sequentially go through them or
+ * roundrobing.
  */
 enum {
-       FIO_FSERVICE_RANDOM     = 1,
-       FIO_FSERVICE_RR         = 2,
-       FIO_FSERVICE_SEQ        = 3,
+       FIO_FSERVICE_RANDOM             = 1,
+       FIO_FSERVICE_RR                 = 2,
+       FIO_FSERVICE_SEQ                = 3,
+       __FIO_FSERVICE_NONUNIFORM       = 0x100,
+       FIO_FSERVICE_ZIPF               = __FIO_FSERVICE_NONUNIFORM | 4,
+       FIO_FSERVICE_PARETO             = __FIO_FSERVICE_NONUNIFORM | 5,
+       FIO_FSERVICE_GAUSS              = __FIO_FSERVICE_NONUNIFORM | 6,
+
+       FIO_FSERVICE_SHIFT              = 10,
 };
 
 /*
@@ -78,6 +85,7 @@ struct fio_file {
         */
        unsigned int major, minor;
        int fileno;
+       int bs;
        char *file_name;
 
        /*
@@ -96,6 +104,13 @@ struct fio_file {
        uint64_t first_write;
        uint64_t last_write;
 
+       /*
+        * Tracks the last iodepth number of completed writes, if data
+        * verification is enabled
+        */
+       uint64_t *last_write_comp;
+       unsigned int last_write_idx;
+
        /*
         * For use by the io engine
         */
@@ -179,6 +194,7 @@ extern int __must_check generic_close_file(struct thread_data *, struct fio_file
 extern int __must_check generic_get_file_size(struct thread_data *, struct fio_file *);
 extern int __must_check file_lookup_open(struct fio_file *f, int flags);
 extern int __must_check pre_read_files(struct thread_data *);
+extern unsigned long long get_rand_file_size(struct thread_data *td);
 extern int add_file(struct thread_data *, const char *, int, int);
 extern int add_file_exclusive(struct thread_data *, const char *);
 extern void get_file(struct fio_file *);