Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-3.0-nmw
[~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 extern void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh);
33
34 static inline unsigned int buf_limit(struct gfs2_sbd *sdp)
35 {
36         unsigned int limit;
37
38         limit = (sdp->sd_sb.sb_bsize - BUF_OFFSET) / sizeof(__be64);
39         return limit;
40 }
41
42 static inline unsigned int databuf_limit(struct gfs2_sbd *sdp)
43 {
44         unsigned int limit;
45
46         limit = (sdp->sd_sb.sb_bsize - DATABUF_OFFSET) / (2 * sizeof(__be64));
47         return limit;
48 }
49
50 static inline void lops_before_commit(struct gfs2_sbd *sdp)
51 {
52         int x;
53         for (x = 0; gfs2_log_ops[x]; x++)
54                 if (gfs2_log_ops[x]->lo_before_commit)
55                         gfs2_log_ops[x]->lo_before_commit(sdp);
56 }
57
58 static inline void lops_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
59 {
60         int x;
61         for (x = 0; gfs2_log_ops[x]; x++)
62                 if (gfs2_log_ops[x]->lo_after_commit)
63                         gfs2_log_ops[x]->lo_after_commit(sdp, ai);
64 }
65
66 static inline void lops_before_scan(struct gfs2_jdesc *jd,
67                                     struct gfs2_log_header_host *head,
68                                     unsigned int pass)
69 {
70         int x;
71         for (x = 0; gfs2_log_ops[x]; x++)
72                 if (gfs2_log_ops[x]->lo_before_scan)
73                         gfs2_log_ops[x]->lo_before_scan(jd, head, pass);
74 }
75
76 static inline int lops_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
77                                      struct gfs2_log_descriptor *ld,
78                                      __be64 *ptr,
79                                      unsigned int pass)
80 {
81         int x, error;
82         for (x = 0; gfs2_log_ops[x]; x++)
83                 if (gfs2_log_ops[x]->lo_scan_elements) {
84                         error = gfs2_log_ops[x]->lo_scan_elements(jd, start,
85                                                                   ld, ptr, pass);
86                         if (error)
87                                 return error;
88                 }
89
90         return 0;
91 }
92
93 static inline void lops_after_scan(struct gfs2_jdesc *jd, int error,
94                                    unsigned int pass)
95 {
96         int x;
97         for (x = 0; gfs2_log_ops[x]; x++)
98                 if (gfs2_log_ops[x]->lo_before_scan)
99                         gfs2_log_ops[x]->lo_after_scan(jd, error, pass);
100 }
101
102 #endif /* __LOPS_DOT_H__ */
103