lops.h

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/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License version 2.
 */

#ifndef __LOPS_DOT_H__
#define __LOPS_DOT_H__

#include <linux/list.h>
#include "incore.h"

#define BUF_OFFSET \
    ((sizeof(struct gfs2_log_descriptor) + sizeof(__be64) - 1) & \
     ~(sizeof(__be64) - 1))
#define DATABUF_OFFSET \
    ((sizeof(struct gfs2_log_descriptor) + (2 * sizeof(__be64) - 1)) & \
     ~(2 * sizeof(__be64) - 1))

extern const struct gfs2_log_operations gfs2_glock_lops;
extern const struct gfs2_log_operations gfs2_buf_lops;
extern const struct gfs2_log_operations gfs2_revoke_lops;
extern const struct gfs2_log_operations gfs2_rg_lops;
extern const struct gfs2_log_operations gfs2_databuf_lops;

extern const struct gfs2_log_operations *gfs2_log_ops[];
extern void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page);
extern void gfs2_log_flush_bio(struct gfs2_sbd *sdp, int rw);

static inline unsigned int buf_limit(struct gfs2_sbd *sdp)
{
    unsigned int limit;

    limit = (sdp->sd_sb.sb_bsize - BUF_OFFSET) / sizeof(__be64);
    return limit;
}

static inline unsigned int databuf_limit(struct gfs2_sbd *sdp)
{
    unsigned int limit;

    limit = (sdp->sd_sb.sb_bsize - DATABUF_OFFSET) / (2 * sizeof(__be64));
    return limit;
}

static inline void lops_init_le(struct gfs2_bufdata *bd,
                const struct gfs2_log_operations *lops)
{
    INIT_LIST_HEAD(&bd->bd_list);
    bd->bd_ops = lops;
}

static inline void lops_add(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
{
    if (bd->bd_ops->lo_add)
        bd->bd_ops->lo_add(sdp, bd);
}

static inline void lops_before_commit(struct gfs2_sbd *sdp)
{
    int x;
    for (x = 0; gfs2_log_ops[x]; x++)
        if (gfs2_log_ops[x]->lo_before_commit)
            gfs2_log_ops[x]->lo_before_commit(sdp);
}

static inline void lops_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
{
    int x;
    for (x = 0; gfs2_log_ops[x]; x++)
        if (gfs2_log_ops[x]->lo_after_commit)
            gfs2_log_ops[x]->lo_after_commit(sdp, ai);
}

static inline void lops_before_scan(struct gfs2_jdesc *jd,
                    struct gfs2_log_header_host *head,
                    unsigned int pass)
{
    int x;
    for (x = 0; gfs2_log_ops[x]; x++)
        if (gfs2_log_ops[x]->lo_before_scan)
            gfs2_log_ops[x]->lo_before_scan(jd, head, pass);
}

static inline int lops_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
                     struct gfs2_log_descriptor *ld,
                     __be64 *ptr,
                     unsigned int pass)
{
    int x, error;
    for (x = 0; gfs2_log_ops[x]; x++)
        if (gfs2_log_ops[x]->lo_scan_elements) {
            error = gfs2_log_ops[x]->lo_scan_elements(jd, start,
                                  ld, ptr, pass);
            if (error)
                return error;
        }

    return 0;
}

static inline void lops_after_scan(struct gfs2_jdesc *jd, int error,
                   unsigned int pass)
{
    int x;
    for (x = 0; gfs2_log_ops[x]; x++)
        if (gfs2_log_ops[x]->lo_before_scan)
            gfs2_log_ops[x]->lo_after_scan(jd, error, pass);
}

#endif /* __LOPS_DOT_H__ */