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_databuf_lops;
  27
  28 extern const struct gfs2_log_operations *gfs2_log_ops[];
  29 extern u64 gfs2_log_bmap(struct gfs2_sbd *sdp);
  30 extern void gfs2_log_write(struct gfs2_sbd *sdp, struct page *page,
  31                            unsigned size, unsigned offset, u64 blkno);
  32 extern void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page);
  33 extern void gfs2_log_flush_bio(struct gfs2_sbd *sdp, int op, int op_flags);
  34 extern void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh);
  35
  36 static inline unsigned int buf_limit(struct gfs2_sbd *sdp)
  37 {
  38         unsigned int limit;
  39
  40         limit = (sdp->sd_sb.sb_bsize - BUF_OFFSET) / sizeof(__be64);
  41         return limit;
  42 }
  43
  44 static inline unsigned int databuf_limit(struct gfs2_sbd *sdp)
  45 {
  46         unsigned int limit;
  47
  48         limit = (sdp->sd_sb.sb_bsize - DATABUF_OFFSET) / (2 * sizeof(__be64));
  49         return limit;
  50 }
  51
  52 static inline void lops_before_commit(struct gfs2_sbd *sdp,
  53                                       struct gfs2_trans *tr)
  54 {
  55         int x;
  56         for (x = 0; gfs2_log_ops[x]; x++)
  57                 if (gfs2_log_ops[x]->lo_before_commit)
  58                         gfs2_log_ops[x]->lo_before_commit(sdp, tr);
  59 }
  60
  61 static inline void lops_after_commit(struct gfs2_sbd *sdp,
  62                                      struct gfs2_trans *tr)
  63 {
  64         int x;
  65         for (x = 0; gfs2_log_ops[x]; x++)
  66                 if (gfs2_log_ops[x]->lo_after_commit)
  67                         gfs2_log_ops[x]->lo_after_commit(sdp, tr);
  68 }
  69
  70 static inline void lops_before_scan(struct gfs2_jdesc *jd,
  71                                     struct gfs2_log_header_host *head,
  72                                     unsigned int pass)
  73 {
  74         int x;
  75         for (x = 0; gfs2_log_ops[x]; x++)
  76                 if (gfs2_log_ops[x]->lo_before_scan)
  77                         gfs2_log_ops[x]->lo_before_scan(jd, head, pass);
  78 }
  79
  80 static inline int lops_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
  81                                      struct gfs2_log_descriptor *ld,
  82                                      __be64 *ptr,
  83                                      unsigned int pass)
  84 {
  85         int x, error;
  86         for (x = 0; gfs2_log_ops[x]; x++)
  87                 if (gfs2_log_ops[x]->lo_scan_elements) {
  88                         error = gfs2_log_ops[x]->lo_scan_elements(jd, start,
  89                                                                   ld, ptr, pass);
  90                         if (error)
  91                                 return error;
  92                 }
  93
  94         return 0;
  95 }
  96
  97 static inline void lops_after_scan(struct gfs2_jdesc *jd, int error,
  98                                    unsigned int pass)
  99 {
 100         int x;
 101         for (x = 0; gfs2_log_ops[x]; x++)
 102                 if (gfs2_log_ops[x]->lo_before_scan)
 103                         gfs2_log_ops[x]->lo_after_scan(jd, error, pass);
 104 }
 105
 106 #endif /* __LOPS_DOT_H__ */
 107