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