linux/fs/gfs2/lops.h
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   1/*
   2 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3 * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
   4 *
   5 * This copyrighted material is made available to anyone wishing to use,
   6 * modify, copy, or redistribute it subject to the terms and conditions
   7 * of the GNU General Public License version 2.
   8 */
   9
  10#ifndef __LOPS_DOT_H__
  11#define __LOPS_DOT_H__
  12
  13#include <linux/list.h>
  14#include "incore.h"
  15
  16#define BUF_OFFSET \
  17        ((sizeof(struct gfs2_log_descriptor) + sizeof(__be64) - 1) & \
  18         ~(sizeof(__be64) - 1))
  19#define DATABUF_OFFSET \
  20        ((sizeof(struct gfs2_log_descriptor) + (2 * sizeof(__be64) - 1)) & \
  21         ~(2 * sizeof(__be64) - 1))
  22
  23extern const struct gfs2_log_operations gfs2_glock_lops;
  24extern const struct gfs2_log_operations gfs2_buf_lops;
  25extern const struct gfs2_log_operations gfs2_revoke_lops;
  26extern const struct gfs2_log_operations gfs2_rg_lops;
  27extern const struct gfs2_log_operations gfs2_databuf_lops;
  28
  29extern const struct gfs2_log_operations *gfs2_log_ops[];
  30extern void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page);
  31extern void gfs2_log_flush_bio(struct gfs2_sbd *sdp, int rw);
  32
  33static inline unsigned int buf_limit(struct gfs2_sbd *sdp)
  34{
  35        unsigned int limit;
  36
  37        limit = (sdp->sd_sb.sb_bsize - BUF_OFFSET) / sizeof(__be64);
  38        return limit;
  39}
  40
  41static inline unsigned int databuf_limit(struct gfs2_sbd *sdp)
  42{
  43        unsigned int limit;
  44
  45        limit = (sdp->sd_sb.sb_bsize - DATABUF_OFFSET) / (2 * sizeof(__be64));
  46        return limit;
  47}
  48
  49static inline void lops_init_le(struct gfs2_bufdata *bd,
  50                                const struct gfs2_log_operations *lops)
  51{
  52        INIT_LIST_HEAD(&bd->bd_list);
  53        bd->bd_ops = lops;
  54}
  55
  56static inline void lops_add(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
  57{
  58        if (bd->bd_ops->lo_add)
  59                bd->bd_ops->lo_add(sdp, bd);
  60}
  61
  62static inline void lops_before_commit(struct gfs2_sbd *sdp)
  63{
  64        int x;
  65        for (x = 0; gfs2_log_ops[x]; x++)
  66                if (gfs2_log_ops[x]->lo_before_commit)
  67                        gfs2_log_ops[x]->lo_before_commit(sdp);
  68}
  69
  70static inline void lops_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
  71{
  72        int x;
  73        for (x = 0; gfs2_log_ops[x]; x++)
  74                if (gfs2_log_ops[x]->lo_after_commit)
  75                        gfs2_log_ops[x]->lo_after_commit(sdp, ai);
  76}
  77
  78static inline void lops_before_scan(struct gfs2_jdesc *jd,
  79                                    struct gfs2_log_header_host *head,
  80                                    unsigned int pass)
  81{
  82        int x;
  83        for (x = 0; gfs2_log_ops[x]; x++)
  84                if (gfs2_log_ops[x]->lo_before_scan)
  85                        gfs2_log_ops[x]->lo_before_scan(jd, head, pass);
  86}
  87
  88static inline int lops_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
  89                                     struct gfs2_log_descriptor *ld,
  90                                     __be64 *ptr,
  91                                     unsigned int pass)
  92{
  93        int x, error;
  94        for (x = 0; gfs2_log_ops[x]; x++)
  95                if (gfs2_log_ops[x]->lo_scan_elements) {
  96                        error = gfs2_log_ops[x]->lo_scan_elements(jd, start,
  97                                                                  ld, ptr, pass);
  98                        if (error)
  99                                return error;
 100                }
 101
 102        return 0;
 103}
 104
 105static inline void lops_after_scan(struct gfs2_jdesc *jd, int error,
 106                                   unsigned int pass)
 107{
 108        int x;
 109        for (x = 0; gfs2_log_ops[x]; x++)
 110                if (gfs2_log_ops[x]->lo_before_scan)
 111                        gfs2_log_ops[x]->lo_after_scan(jd, error, pass);
 112}
 113
 114#endif /* __LOPS_DOT_H__ */
 115
 116
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