include/sys/zfs_ratelimit.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * This file and its contents are supplied under the terms of the
   5  * Common Development and Distribution License ("CDDL"), version 1.0.
   6  * You may only use this file in accordance with the terms of version
   7  * 1.0 of the CDDL.
   8  *
   9  * A full copy of the text of the CDDL should have accompanied this
  10  * source.  A copy of the CDDL is also available via the Internet at
  11  * http://www.illumos.org/license/CDDL.
  12  *
  13  * CDDL HEADER END
  14  */
  15
  16 /*
  17  * Copyright (c) 2016, Lawrence Livermore National Security, LLC.
  18  */
  19
  20 #ifndef _SYS_ZFS_RATELIMIT_H
  21 #define _SYS_ZFS_RATELIMIT_H
  22
  23 #include <sys/zfs_context.h>
  24
  25 typedef struct {
  26         hrtime_t start;
  27         unsigned int count;
  28
  29         /*
  30          * Pointer to number of events per interval.  We do this to
  31          * allow the burst to be a (changeable) module parameter.
  32          */
  33         unsigned int *burst;
  34
  35         unsigned int interval;  /* Interval length in seconds */
  36         kmutex_t lock;
  37 } zfs_ratelimit_t;
  38
  39 int zfs_ratelimit(zfs_ratelimit_t *rl);
  40 void zfs_ratelimit_init(zfs_ratelimit_t *rl, unsigned int *burst,
  41     unsigned int interval);
  42 void zfs_ratelimit_fini(zfs_ratelimit_t *rl);
  43
  44 #endif  /* _SYS_ZFS_RATELIMIT_H */