LCOV - code coverage report
Current view: top level - drivers - tapdisk-loglimit.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 31 0.0 %
Date: 2024-06-19 15:27:45 Functions: 0 4 0.0 %
Branches: 0 12 0.0 %

           Branch data     Line data    Source code
       1                 :            : /*
       2                 :            :  * Copyright (c) 2016, Citrix Systems, Inc.
       3                 :            :  *
       4                 :            :  * All rights reserved.
       5                 :            :  *
       6                 :            :  * Redistribution and use in source and binary forms, with or without
       7                 :            :  * modification, are permitted provided that the following conditions are met:
       8                 :            :  * 
       9                 :            :  *  1. Redistributions of source code must retain the above copyright
      10                 :            :  *     notice, this list of conditions and the following disclaimer.
      11                 :            :  *  2. Redistributions in binary form must reproduce the above copyright
      12                 :            :  *     notice, this list of conditions and the following disclaimer in the
      13                 :            :  *     documentation and/or other materials provided with the distribution.
      14                 :            :  *  3. Neither the name of the copyright holder nor the names of its 
      15                 :            :  *     contributors may be used to endorse or promote products derived from 
      16                 :            :  *     this software without specific prior written permission.
      17                 :            :  *
      18                 :            :  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      19                 :            :  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      20                 :            :  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      21                 :            :  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
      22                 :            :  * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
      23                 :            :  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
      24                 :            :  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
      25                 :            :  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
      26                 :            :  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
      27                 :            :  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
      28                 :            :  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      29                 :            :  */
      30                 :            : 
      31                 :            : /*
      32                 :            :  * Simple log rate limiting. Allow for bursts, then drop messages
      33                 :            :  * until some interval expired.
      34                 :            :  */
      35                 :            : 
      36                 :            : #ifdef HAVE_CONFIG_H
      37                 :            : #include "config.h"
      38                 :            : #endif
      39                 :            : 
      40                 :            : #include "tapdisk-loglimit.h"
      41                 :            : #include "compiler.h"
      42                 :            : #include "list.h"
      43                 :            : 
      44                 :            : void
      45                 :          0 : tapdisk_loglimit_init(td_loglimit_t *rl, int burst, int interval)
      46                 :            : {
      47                 :          0 :         rl->burst    = burst;
      48                 :          0 :         rl->interval = interval;
      49                 :            : 
      50                 :          0 :         rl->count    = 0;
      51                 :          0 :         rl->dropped  = 0;
      52                 :            : 
      53                 :          0 :         gettimeofday(&rl->ts, NULL);
      54                 :          0 : }
      55                 :            : 
      56                 :            : static void
      57                 :            : timeradd_ms(struct timeval *tv, long ms)
      58                 :            : {
      59                 :          0 :         tv->tv_usec += ms * 1000;
      60         [ #  # ]:          0 :         if (tv->tv_usec > 1000000) {
      61                 :          0 :                 tv->tv_sec  += tv->tv_usec / 1000000;
      62                 :          0 :                 tv->tv_usec %= 1000000;
      63                 :            :         }
      64                 :            : }
      65                 :            : 
      66                 :            : static void
      67                 :          0 : tapdisk_loglimit_update(td_loglimit_t *rl, struct timeval *now)
      68                 :            : {
      69                 :          0 :         struct timeval next = rl->ts;
      70                 :            : 
      71                 :          0 :         timeradd_ms(&next, rl->interval);
      72                 :            : 
      73 [ #  # ][ #  # ]:          0 :         if (timercmp(&next, now, <)) {
      74                 :          0 :                 rl->count = 0;
      75                 :          0 :                 rl->ts    = *now;
      76                 :            :         }
      77                 :          0 : }
      78                 :            : 
      79                 :            : static void
      80                 :          0 : tapdisk_loglimit_update_now(td_loglimit_t *rl)
      81                 :            : {
      82                 :            :         struct timeval now;
      83                 :            : 
      84                 :          0 :         gettimeofday(&now, NULL);
      85                 :            : 
      86                 :          0 :         tapdisk_loglimit_update(rl, &now);
      87                 :          0 : }
      88                 :            : 
      89                 :            : int
      90                 :          0 : tapdisk_loglimit_pass(td_loglimit_t *rl)
      91                 :            : {
      92         [ #  # ]:          0 :         if (!rl->interval)
      93                 :            :                 return 1; /* unlimited */
      94                 :            : 
      95         [ #  # ]:          0 :         if (unlikely(rl->count >= rl->burst)) {
      96                 :            : 
      97                 :          0 :                 tapdisk_loglimit_update_now(rl);
      98                 :            : 
      99         [ #  # ]:          0 :                 if (rl->count >= rl->burst) {
     100                 :          0 :                         rl->dropped++;
     101                 :          0 :                         return 0;
     102                 :            :                 }
     103                 :            :         }
     104                 :            : 
     105                 :          0 :         rl->count++;
     106                 :          0 :         return 1;
     107                 :            : }

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