include/sys/zfs_debug.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  23  * Copyright (c) 2012, 2018 by Delphix. All rights reserved.
  24  */
  25
  26 #ifndef _SYS_ZFS_DEBUG_H
  27 #define _SYS_ZFS_DEBUG_H
  28
  29 #ifdef  __cplusplus
  30 extern "C" {
  31 #endif
  32
  33 #ifndef TRUE
  34 #define TRUE 1
  35 #endif
  36
  37 #ifndef FALSE
  38 #define FALSE 0
  39 #endif
  40
  41 extern int zfs_flags;
  42 extern int zfs_recover;
  43 extern int zfs_free_leak_on_eio;
  44 extern int zfs_dbgmsg_enable;
  45
  46 #define ZFS_DEBUG_DPRINTF               (1 << 0)
  47 #define ZFS_DEBUG_DBUF_VERIFY           (1 << 1)
  48 #define ZFS_DEBUG_DNODE_VERIFY          (1 << 2)
  49 #define ZFS_DEBUG_SNAPNAMES             (1 << 3)
  50 #define ZFS_DEBUG_MODIFY                (1 << 4)
  51 /* 1<<5 was previously used, try not to reuse */
  52 #define ZFS_DEBUG_ZIO_FREE              (1 << 6)
  53 #define ZFS_DEBUG_HISTOGRAM_VERIFY      (1 << 7)
  54 #define ZFS_DEBUG_METASLAB_VERIFY       (1 << 8)
  55 #define ZFS_DEBUG_SET_ERROR             (1 << 9)
  56 #define ZFS_DEBUG_INDIRECT_REMAP        (1 << 10)
  57 #define ZFS_DEBUG_TRIM                  (1 << 11)
  58
  59 extern void __zfs_dbgmsg(char *buf);
  60 extern void __dprintf(boolean_t dprint, const char *file, const char *func,
  61     int line, const char *fmt, ...);
  62
  63 /*
  64  * Some general principles for using zfs_dbgmsg():
  65  * 1. We don't want to pollute the log with typically-irrelevant messages,
  66  *    so don't print too many messages in the "normal" code path - O(1)
  67  *    per txg.
  68  * 2. We want to know for sure what happened, so make the message specific
  69  *    (e.g. *which* thing am I operating on).
  70  * 3. Do print a message when something unusual or unexpected happens
  71  *    (e.g. error cases).
  72  * 4. Print a message when making user-initiated on-disk changes.
  73  *
  74  * Note that besides principle 1, another reason that we don't want to
  75  * use zfs_dbgmsg in high-frequency routines is the potential impact
  76  * that it can have on performance.
  77  */
  78 #define zfs_dbgmsg(...) \
  79         if (zfs_dbgmsg_enable) \
  80                 __dprintf(B_FALSE, __FILE__, __func__, __LINE__, __VA_ARGS__)
  81
  82 #ifdef ZFS_DEBUG
  83 /*
  84  * To enable this:
  85  *
  86  * $ echo 1 >/sys/module/zfs/parameters/zfs_flags
  87  */
  88 #define dprintf(...) \
  89         if (zfs_flags & ZFS_DEBUG_DPRINTF) \
  90                 __dprintf(B_TRUE, __FILE__, __func__, __LINE__, __VA_ARGS__)
  91 #else
  92 #define dprintf(...) ((void)0)
  93 #endif /* ZFS_DEBUG */
  94
  95 extern void zfs_panic_recover(const char *fmt, ...);
  96
  97 extern void zfs_dbgmsg_init(void);
  98 extern void zfs_dbgmsg_fini(void);
  99
 100 #ifndef _KERNEL
 101 extern int dprintf_find_string(const char *string);
 102 extern void zfs_dbgmsg_print(const char *tag);
 103 #endif
 104
 105 #ifdef  __cplusplus
 106 }
 107 #endif
 108
 109 #endif  /* _SYS_ZFS_DEBUG_H */