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
  23 extern const struct gfs2_log_operations gfs2_glock_lops;
  24 extern const struct gfs2_log_operations gfs2_buf_lops;
  25 extern const struct gfs2_log_operations gfs2_revoke_lops;
  26 extern const struct gfs2_log_operations gfs2_rg_lops;
  27 extern const struct gfs2_log_operations gfs2_databuf_lops;
  28
  29 extern const struct gfs2_log_operations *gfs2_log_ops[];
  30
  31 static 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
  39 static 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
  47 static 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
  54 static 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
  60 static 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
  68 static 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
  76 static 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
  86 static 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
 103 static 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