LXR linux/fs/gfs2/lops.h

   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_databuf_lops;
  27
  28extern const struct gfs2_log_operations *gfs2_log_ops[];
  29extern void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page);
  30extern void gfs2_log_flush_bio(struct gfs2_sbd *sdp, int rw);
  31extern void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh);
  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_before_commit(struct gfs2_sbd *sdp,
  50                                      struct gfs2_trans *tr)
  51{
  52        int x;
  53        for (x = 0; gfs2_log_ops[x]; x++)
  54                if (gfs2_log_ops[x]->lo_before_commit)
  55                        gfs2_log_ops[x]->lo_before_commit(sdp, tr);
  56}
  57
  58static inline void lops_after_commit(struct gfs2_sbd *sdp,
  59                                     struct gfs2_trans *tr)
  60{
  61        int x;
  62        for (x = 0; gfs2_log_ops[x]; x++)
  63                if (gfs2_log_ops[x]->lo_after_commit)
  64                        gfs2_log_ops[x]->lo_after_commit(sdp, tr);
  65}
  66
  67static inline void lops_before_scan(struct gfs2_jdesc *jd,
  68                                    struct gfs2_log_header_host *head,
  69                                    unsigned int pass)
  70{
  71        int x;
  72        for (x = 0; gfs2_log_ops[x]; x++)
  73                if (gfs2_log_ops[x]->lo_before_scan)
  74                        gfs2_log_ops[x]->lo_before_scan(jd, head, pass);
  75}
  76
  77static inline int lops_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
  78                                     struct gfs2_log_descriptor *ld,
  79                                     __be64 *ptr,
  80                                     unsigned int pass)
  81{
  82        int x, error;
  83        for (x = 0; gfs2_log_ops[x]; x++)
  84                if (gfs2_log_ops[x]->lo_scan_elements) {
  85                        error = gfs2_log_ops[x]->lo_scan_elements(jd, start,
  86                                                                  ld, ptr, pass);
  87                        if (error)
  88                                return error;
  89                }
  90
  91        return 0;
  92}
  93
  94static inline void lops_after_scan(struct gfs2_jdesc *jd, int error,
  95                                   unsigned int pass)
  96{
  97        int x;
  98        for (x = 0; gfs2_log_ops[x]; x++)
  99                if (gfs2_log_ops[x]->lo_before_scan)
 100                        gfs2_log_ops[x]->lo_after_scan(jd, error, pass);
 101}
 102
 103#endif /* __LOPS_DOT_H__ */
 104
 105