root/fs/xfs/support/ktrace.h

INCLUDED FROM

/*
 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef __XFS_SUPPORT_KTRACE_H__
#define __XFS_SUPPORT_KTRACE_H__

/*
 * Trace buffer entry structure.
 */
typedef struct ktrace_entry {
        void    *val[16];
} ktrace_entry_t;

/*
 * Trace buffer header structure.
 */
typedef struct ktrace {
        int             kt_nentries;    /* number of entries in trace buf */
        atomic_t        kt_index;       /* current index in entries */
        unsigned int    kt_index_mask;
        int             kt_rollover;
        ktrace_entry_t  *kt_entries;    /* buffer of entries */
} ktrace_t;

/*
 * Trace buffer snapshot structure.
 */
typedef struct ktrace_snap {
        int             ks_start;       /* kt_index at time of snap */
        int             ks_index;       /* current index */
} ktrace_snap_t;


#ifdef CONFIG_XFS_TRACE

extern void ktrace_init(int zentries);
extern void ktrace_uninit(void);

extern ktrace_t *ktrace_alloc(int, unsigned int __nocast);
extern void ktrace_free(ktrace_t *);

extern void ktrace_enter(
        ktrace_t        *,
        void            *,
        void            *,
        void            *,
        void            *,
        void            *,
        void            *,
        void            *,
        void            *,
        void            *,
        void            *,
        void            *,
        void            *,
        void            *,
        void            *,
        void            *,
        void            *);

extern ktrace_entry_t   *ktrace_first(ktrace_t *, ktrace_snap_t *);
extern int              ktrace_nentries(ktrace_t *);
extern ktrace_entry_t   *ktrace_next(ktrace_t *, ktrace_snap_t *);
extern ktrace_entry_t   *ktrace_skip(ktrace_t *, int, ktrace_snap_t *);

#else
#define ktrace_init(x)  do { } while (0)
#define ktrace_uninit() do { } while (0)
#endif  /* CONFIG_XFS_TRACE */

#endif  /* __XFS_SUPPORT_KTRACE_H__ */