Merge tag 'for-linus-v3.9-rc1' of git://oss.sgi.com/xfs/xfs
[~shefty/rdma-dev.git] / 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 extern void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page);
31 extern void gfs2_log_flush_bio(struct gfs2_sbd *sdp, int rw);
32
33 static 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
41 static 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
49 static 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
56 static 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
62 static 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
70 static 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
78 static 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
88 static 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
105 static 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