3956 ::vdev -r should work with pipelines
3957 ztest should update the cachefile before killing itself
3958 multiple scans can lead to partial resilvering
3959 ddt entries are not always resilvered
3960 dsl_scan can skip over dedup-ed blocks if physical birth != logical birth
3961 freed gang blocks are not resilvered and can cause pool to suspend
3962 ztest should print out zfs debug buffer before exiting
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>

          --- old/usr/src/uts/common/fs/zfs/zfs_debug.c
          +++ new/usr/src/uts/common/fs/zfs/zfs_debug.c

   1    1  /*
   2    2   * CDDL HEADER START
   3    3   *
   4    4   * The contents of this file are subject to the terms of the
   5    5   * Common Development and Distribution License (the "License").
   6    6   * You may not use this file except in compliance with the License.
   7    7   *
   8    8   * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9    9   * or http://www.opensolaris.org/os/licensing.
  10   10   * See the License for the specific language governing permissions
  11   11   * and limitations under the License.
  12   12   *

  13   13   * When distributing Covered Code, include this CDDL HEADER in each
  14   14   * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15   15   * If applicable, add the following below this CDDL HEADER, with the
  16   16   * fields enclosed by brackets "[]" replaced with your own identifying
  17   17   * information: Portions Copyright [yyyy] [name of copyright owner]
  18   18   *
  19   19   * CDDL HEADER END
  20   20   */
  21   21  /*
  22   22   * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
  23      - * Copyright (c) 2012 by Delphix. All rights reserved.
       23 + * Copyright (c) 2013 by Delphix. All rights reserved.
  24   24   */
  25   25  
  26   26  #include <sys/zfs_context.h>
  27   27  
  28   28  list_t zfs_dbgmsgs;
  29   29  int zfs_dbgmsg_size;
  30   30  kmutex_t zfs_dbgmsgs_lock;
  31   31  int zfs_dbgmsg_maxsize = 1<<20; /* 1MB */
  32   32  
  33   33  void

  34   34  zfs_dbgmsg_init(void)
  35   35  {
  36   36          list_create(&zfs_dbgmsgs, sizeof (zfs_dbgmsg_t),
  37   37              offsetof(zfs_dbgmsg_t, zdm_node));
  38   38          mutex_init(&zfs_dbgmsgs_lock, NULL, MUTEX_DEFAULT, NULL);
  39   39  }
  40   40  
  41   41  void
  42   42  zfs_dbgmsg_fini(void)
  43   43  {
  44   44          zfs_dbgmsg_t *zdm;
  45   45  
  46   46          while ((zdm = list_remove_head(&zfs_dbgmsgs)) != NULL) {
  47   47                  int size = sizeof (zfs_dbgmsg_t) + strlen(zdm->zdm_msg);
  48   48                  kmem_free(zdm, size);
  49   49                  zfs_dbgmsg_size -= size;
  50   50          }
  51   51          mutex_destroy(&zfs_dbgmsgs_lock);
  52   52          ASSERT0(zfs_dbgmsg_size);
  53   53  }
  54   54  
  55   55  /*
  56   56   * Print these messages by running:
  57   57   * echo ::zfs_dbgmsg | mdb -k
  58   58   *
  59   59   * Monitor these messages by running:
  60   60   *      dtrace -q -n 'zfs-dbgmsg{printf("%s\n", stringof(arg0))}'
  61   61   */
  62   62  void
  63   63  zfs_dbgmsg(const char *fmt, ...)
  64   64  {
  65   65          int size;
  66   66          va_list adx;
  67   67          zfs_dbgmsg_t *zdm;
  68   68  
  69   69          va_start(adx, fmt);
  70   70          size = vsnprintf(NULL, 0, fmt, adx);
  71   71          va_end(adx);
  72   72  
  73   73          /*
  74   74           * There is one byte of string in sizeof (zfs_dbgmsg_t), used
  75   75           * for the terminating null.
  76   76           */
  77   77          zdm = kmem_alloc(sizeof (zfs_dbgmsg_t) + size, KM_SLEEP);
  78   78          zdm->zdm_timestamp = gethrestime_sec();
  79   79  
  80   80          va_start(adx, fmt);
  81   81          (void) vsnprintf(zdm->zdm_msg, size + 1, fmt, adx);
  82   82          va_end(adx);
  83   83  
  84   84          DTRACE_PROBE1(zfs__dbgmsg, char *, zdm->zdm_msg);
  85   85  
  86   86          mutex_enter(&zfs_dbgmsgs_lock);

  87   87          list_insert_tail(&zfs_dbgmsgs, zdm);
  88   88          zfs_dbgmsg_size += sizeof (zfs_dbgmsg_t) + size;
  89   89          while (zfs_dbgmsg_size > zfs_dbgmsg_maxsize) {
  90   90                  zdm = list_remove_head(&zfs_dbgmsgs);
  91   91                  size = sizeof (zfs_dbgmsg_t) + strlen(zdm->zdm_msg);
  92   92                  kmem_free(zdm, size);
  93   93                  zfs_dbgmsg_size -= size;
  94   94          }
  95   95          mutex_exit(&zfs_dbgmsgs_lock);
  96   96  }
       97 +
       98 +void
       99 +zfs_dbgmsg_print(const char *tag)
      100 +{
      101 +        zfs_dbgmsg_t *zdm;
      102 +
      103 +        (void) printf("ZFS_DBGMSG(%s):\n", tag);
      104 +        mutex_enter(&zfs_dbgmsgs_lock);
      105 +        for (zdm = list_head(&zfs_dbgmsgs); zdm;
      106 +            zdm = list_next(&zfs_dbgmsgs, zdm))
      107 +                (void) printf("%s\n", zdm->zdm_msg);
      108 +        mutex_exit(&zfs_dbgmsgs_lock);
      109 +}
    

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