FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/sys/fm/util.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) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
     */
    
    #ifndef _SYS_FM_UTIL_H
    #define _SYS_FM_UTIL_H
    
    #ifdef  __cplusplus
    extern "C" {
    #endif
    
    #include <sys/nvpair.h>
    #include <sys/zfs_file.h>
    
    /*
     * Shared user/kernel definitions for class length, error channel name,
     * and kernel event publisher string.
     */
    #define FM_MAX_CLASS 100
    #define FM_ERROR_CHAN   "com.sun:fm:error"
    #define FM_PUB          "fm"
    
    /*
     * ereport dump device transport support
     *
     * Ereports are written out to the dump device at a proscribed offset from the
     * end, similar to in-transit log messages.  The ereports are represented as a
     * erpt_dump_t header followed by ed_size bytes of packed native nvlist data.
     *
     * NOTE: All of these constants and the header must be defined so they have the
     * same representation for *both* 32-bit and 64-bit producers and consumers.
     */
    #define ERPT_MAGIC      0xf00d4eddU
    #define ERPT_MAX_ERRS   16
    #define ERPT_DATA_SZ    (6 * 1024)
    #define ERPT_EVCH_MAX   256
    #define ERPT_HIWAT      64
    
    typedef struct erpt_dump {
            uint32_t ed_magic;      /* ERPT_MAGIC or zero to indicate end */
            uint32_t ed_chksum;     /* checksum32() of packed nvlist data */
            uint32_t ed_size;       /* ereport (nvl) fixed buf size */
            uint32_t ed_pad;        /* reserved for future use */
            hrtime_t ed_hrt_nsec;   /* hrtime of this ereport */
            hrtime_t ed_hrt_base;   /* hrtime sample corresponding to ed_tod_base */
            struct {
                    uint64_t sec;   /* seconds since gettimeofday() Epoch */
                    uint64_t nsec;  /* nanoseconds past ed_tod_base.sec */
            } ed_tod_base;
    } erpt_dump_t;
    
    #ifdef _KERNEL
    
    #define ZEVENT_SHUTDOWN         0x1
    
    typedef void zevent_cb_t(nvlist_t *, nvlist_t *);
    
    typedef struct zevent_s {
            nvlist_t        *ev_nvl;        /* protected by the zevent_lock */
            nvlist_t        *ev_detector;   /* " */
            list_t          ev_ze_list;     /* " */
            list_node_t     ev_node;        /* " */
            zevent_cb_t     *ev_cb;         /* " */
            uint64_t        ev_eid;
    } zevent_t;
    
    typedef struct zfs_zevent {
            zevent_t        *ze_zevent;     /* protected by the zevent_lock */
            list_node_t     ze_node;        /* " */
            uint64_t        ze_dropped;     /* " */
    } zfs_zevent_t;
    
    extern void fm_init(void);
    extern void fm_fini(void);
    extern void zfs_zevent_post_cb(nvlist_t *nvl, nvlist_t *detector);
    extern int zfs_zevent_post(nvlist_t *, nvlist_t *, zevent_cb_t *);
    extern void zfs_zevent_drain_all(uint_t *);
    extern zfs_file_t *zfs_zevent_fd_hold(int, minor_t *, zfs_zevent_t **);
   extern void zfs_zevent_fd_rele(zfs_file_t *);
   extern int zfs_zevent_next(zfs_zevent_t *, nvlist_t **, uint64_t *, uint64_t *);
   extern int zfs_zevent_wait(zfs_zevent_t *);
   extern int zfs_zevent_seek(zfs_zevent_t *, uint64_t);
   extern void zfs_zevent_init(zfs_zevent_t **);
   extern void zfs_zevent_destroy(zfs_zevent_t *);
   
   extern void zfs_zevent_track_duplicate(void);
   extern void zfs_ereport_init(void);
   extern void zfs_ereport_fini(void);
   #else
   
   static inline void fm_init(void) { }
   static inline void fm_fini(void) { }
   
   #endif  /* _KERNEL */
   
   #ifdef  __cplusplus
   }
   #endif
   
   #endif /* _SYS_FM_UTIL_H */

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