FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/sys/zfs_debug.h

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License (the "License").
      * You may not use this file except in compliance with the License.
      *
      * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      * or https://opensource.org/licenses/CDDL-1.0.
     * See the License for the specific language governing permissions
     * and limitations under the License.
     *
     * When distributing Covered Code, include this CDDL HEADER in each
     * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     * If applicable, add the following below this CDDL HEADER, with the
     * fields enclosed by brackets "[]" replaced with your own identifying
     * information: Portions Copyright [yyyy] [name of copyright owner]
     *
     * CDDL HEADER END
     */
    /*
     * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
     * Copyright (c) 2012, 2019 by Delphix. All rights reserved.
     */
    
    #ifndef _SYS_ZFS_DEBUG_H
    #define _SYS_ZFS_DEBUG_H
    
    #ifdef  __cplusplus
    extern "C" {
    #endif
    
    #ifndef TRUE
    #define TRUE 1
    #endif
    
    #ifndef FALSE
    #define FALSE 0
    #endif
    
    extern int zfs_flags;
    extern int zfs_recover;
    extern int zfs_free_leak_on_eio;
    extern int zfs_dbgmsg_enable;
    
    #define ZFS_DEBUG_DPRINTF               (1 << 0)
    #define ZFS_DEBUG_DBUF_VERIFY           (1 << 1)
    #define ZFS_DEBUG_DNODE_VERIFY          (1 << 2)
    #define ZFS_DEBUG_SNAPNAMES             (1 << 3)
    #define ZFS_DEBUG_MODIFY                (1 << 4)
    /* 1<<5 was previously used, try not to reuse */
    #define ZFS_DEBUG_ZIO_FREE              (1 << 6)
    #define ZFS_DEBUG_HISTOGRAM_VERIFY      (1 << 7)
    #define ZFS_DEBUG_METASLAB_VERIFY       (1 << 8)
    #define ZFS_DEBUG_SET_ERROR             (1 << 9)
    #define ZFS_DEBUG_INDIRECT_REMAP        (1 << 10)
    #define ZFS_DEBUG_TRIM                  (1 << 11)
    #define ZFS_DEBUG_LOG_SPACEMAP          (1 << 12)
    #define ZFS_DEBUG_METASLAB_ALLOC        (1 << 13)
    
    extern void __set_error(const char *file, const char *func, int line, int err);
    extern void __zfs_dbgmsg(char *buf);
    extern void __dprintf(boolean_t dprint, const char *file, const char *func,
        int line, const char *fmt, ...)  __attribute__((format(printf, 5, 6)));
    
    /*
     * Some general principles for using zfs_dbgmsg():
     * 1. We don't want to pollute the log with typically-irrelevant messages,
     *    so don't print too many messages in the "normal" code path - O(1)
     *    per txg.
     * 2. We want to know for sure what happened, so make the message specific
     *    (e.g. *which* thing am I operating on).
     * 3. Do print a message when something unusual or unexpected happens
     *    (e.g. error cases).
     * 4. Print a message when making user-initiated on-disk changes.
     *
     * Note that besides principle 1, another reason that we don't want to
     * use zfs_dbgmsg in high-frequency routines is the potential impact
     * that it can have on performance.
     */
    #define zfs_dbgmsg(...) \
            if (zfs_dbgmsg_enable) \
                    __dprintf(B_FALSE, __FILE__, __func__, __LINE__, __VA_ARGS__)
    
    #ifdef ZFS_DEBUG
    /*
     * To enable this:
     *
     * $ echo 1 >/sys/module/zfs/parameters/zfs_flags
     */
    #define dprintf(...) \
            if (zfs_flags & ZFS_DEBUG_DPRINTF) \
                    __dprintf(B_TRUE, __FILE__, __func__, __LINE__, __VA_ARGS__)
    #else
    #define dprintf(...) ((void)0)
    #endif /* ZFS_DEBUG */
    
    extern void zfs_panic_recover(const char *fmt, ...);
    
   extern void zfs_dbgmsg_init(void);
   extern void zfs_dbgmsg_fini(void);
   
   #ifndef _KERNEL
   extern int dprintf_find_string(const char *string);
   extern void zfs_dbgmsg_print(const char *tag);
   #endif
   
   #ifdef  __cplusplus
   }
   #endif
   
   #endif  /* _SYS_ZFS_DEBUG_H */

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