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_rg_lops;
  27extern const struct gfs2_log_operations gfs2_databuf_lops;
  28
  29extern const struct gfs2_log_operations *gfs2_log_ops[];
  30
  31static inline unsigned int buf_limit(struct gfs2_sbd *sdp)
  32{
  33        unsigned int limit;
  34
  35        limit = (sdp->sd_sb.sb_bsize - BUF_OFFSET) / sizeof(__be64);
  36        return limit;
  37}
  38
  39static inline unsigned int databuf_limit(struct gfs2_sbd *sdp)
  40{
  41        unsigned int limit;
  42
  43        limit = (sdp->sd_sb.sb_bsize - DATABUF_OFFSET) / (2 * sizeof(__be64));
  44        return limit;
  45}
  46
  47static inline void lops_init_le(struct gfs2_log_element *le,
  48                                const struct gfs2_log_operations *lops)
  49{
  50        INIT_LIST_HEAD(&le->le_list);
  51        le->le_ops = lops;
  52}
  53
  54static inline void lops_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
  55{
  56        if (le->le_ops->lo_add)
  57                le->le_ops->lo_add(sdp, le);
  58}
  59
  60static inline void lops_before_commit(struct gfs2_sbd *sdp)
  61{
  62        int x;
  63        for (x = 0; gfs2_log_ops[x]; x++)
  64                if (gfs2_log_ops[x]->lo_before_commit)
  65                        gfs2_log_ops[x]->lo_before_commit(sdp);
  66}
  67
  68static inline void lops_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
  69{
  70        int x;
  71        for (x = 0; gfs2_log_ops[x]; x++)
  72                if (gfs2_log_ops[x]->lo_after_commit)
  73                        gfs2_log_ops[x]->lo_after_commit(sdp, ai);
  74}
  75
  76static inline void lops_before_scan(struct gfs2_jdesc *jd,
  77                                    struct gfs2_log_header_host *head,
  78                                    unsigned int pass)
  79{
  80        int x;
  81        for (x = 0; gfs2_log_ops[x]; x++)
  82                if (gfs2_log_ops[x]->lo_before_scan)
  83                        gfs2_log_ops[x]->lo_before_scan(jd, head, pass);
  84}
  85
  86static inline int lops_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
  87                                     struct gfs2_log_descriptor *ld,
  88                                     __be64 *ptr,
  89                                     unsigned int pass)
  90{
  91        int x, error;
  92        for (x = 0; gfs2_log_ops[x]; x++)
  93                if (gfs2_log_ops[x]->lo_scan_elements) {
  94                        error = gfs2_log_ops[x]->lo_scan_elements(jd, start,
  95                                                                  ld, ptr, pass);
  96                        if (error)
  97                                return error;
  98                }
  99
 100        return 0;
 101}
 102
 103static inline void lops_after_scan(struct gfs2_jdesc *jd, int error,
 104                                   unsigned int pass)
 105{
 106        int x;
 107        for (x = 0; gfs2_log_ops[x]; x++)
 108                if (gfs2_log_ops[x]->lo_before_scan)
 109                        gfs2_log_ops[x]->lo_after_scan(jd, error, pass);
 110}
 111
 112#endif /* __LOPS_DOT_H__ */
 113
 114