module/zfs/zfs_debug.c

   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) 2010, Oracle and/or its affiliates. All rights reserved.
  23  */
  24
  25 #include <sys/zfs_context.h>
  26
  27 /*
  28  * Enable various debugging features.
  29  */
  30 int zfs_flags = 0;
  31
  32 /*
  33  * zfs_recover can be set to nonzero to attempt to recover from
  34  * otherwise-fatal errors, typically caused by on-disk corruption.  When
  35  * set, calls to zfs_panic_recover() will turn into warning messages.
  36  */
  37 int zfs_recover = 0;
  38
  39
  40 void
  41 zfs_panic_recover(const char *fmt, ...)
  42 {
  43         va_list adx;
  44
  45         va_start(adx, fmt);
  46         vcmn_err(zfs_recover ? CE_WARN : CE_PANIC, fmt, adx);
  47         va_end(adx);
  48 }
  49
  50 /*
  51  * Debug logging is enabled by default for production kernel builds.
  52  * The overhead for this is negligible and the logs can be valuable when
  53  * debugging.  For non-production user space builds all debugging except
  54  * logging is enabled since performance is no longer a concern.
  55  */
  56 void
  57 zfs_dbgmsg_init(void)
  58 {
  59         if (zfs_flags == 0) {
  60 #if defined(_KERNEL)
  61                 zfs_flags = ZFS_DEBUG_DPRINTF;
  62                 spl_debug_mask |= SD_DPRINTF;
  63                 spl_debug_subsys |= SS_USER1;
  64 #else
  65                 zfs_flags = ~ZFS_DEBUG_DPRINTF;
  66 #endif /* _KERNEL */
  67         }
  68 }
  69
  70 void
  71 zfs_dbgmsg_fini(void)
  72 {
  73         return;
  74 }
  75
  76
  77 #if defined(_KERNEL)
  78 module_param(zfs_flags, int, 0644);
  79 MODULE_PARM_DESC(zfs_flags, "Set additional debugging flags");
  80
  81 module_param(zfs_recover, int, 0644);
  82 MODULE_PARM_DESC(zfs_recover, "Set to attempt to recover from fatal errors");
  83 #endif /* _KERNEL */