d0a58cdd433a90c1024cac530368e1168572cd21
[releases.git] / meta_io.h
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
4  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
5  */
6
7 #ifndef __DIO_DOT_H__
8 #define __DIO_DOT_H__
9
10 #include <linux/buffer_head.h>
11 #include <linux/string.h>
12 #include "incore.h"
13
14 static inline void gfs2_buffer_clear(struct buffer_head *bh)
15 {
16         memset(bh->b_data, 0, bh->b_size);
17 }
18
19 static inline void gfs2_buffer_clear_tail(struct buffer_head *bh, int head)
20 {
21         BUG_ON(head > bh->b_size);
22         memset(bh->b_data + head, 0, bh->b_size - head);
23 }
24
25 static inline void gfs2_buffer_copy_tail(struct buffer_head *to_bh,
26                                          int to_head,
27                                          struct buffer_head *from_bh,
28                                          int from_head)
29 {
30         BUG_ON(from_head < to_head);
31         memcpy(to_bh->b_data + to_head, from_bh->b_data + from_head,
32                from_bh->b_size - from_head);
33         memset(to_bh->b_data + to_bh->b_size + to_head - from_head,
34                0, from_head - to_head);
35 }
36
37 extern const struct address_space_operations gfs2_meta_aops;
38 extern const struct address_space_operations gfs2_rgrp_aops;
39
40 static inline struct gfs2_sbd *gfs2_mapping2sbd(struct address_space *mapping)
41 {
42         struct inode *inode = mapping->host;
43         if (mapping->a_ops == &gfs2_meta_aops) {
44                 struct gfs2_glock_aspace *gla =
45                         container_of(mapping, struct gfs2_glock_aspace, mapping);
46                 return gla->glock.gl_name.ln_sbd;
47         } else if (mapping->a_ops == &gfs2_rgrp_aops)
48                 return container_of(mapping, struct gfs2_sbd, sd_aspace);
49         else
50                 return inode->i_sb->s_fs_info;
51 }
52
53 extern struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno);
54 extern int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
55                           int rahead, struct buffer_head **bhp);
56 extern int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh);
57 extern struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno,
58                                        int create);
59 enum {
60         REMOVE_JDATA = 0,
61         REMOVE_META = 1,
62 };
63
64 extern void gfs2_remove_from_journal(struct buffer_head *bh, int meta);
65 extern void gfs2_journal_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen);
66 extern int gfs2_meta_buffer(struct gfs2_inode *ip, u32 mtype, u64 num,
67                             struct buffer_head **bhp);
68
69 static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip,
70                                          struct buffer_head **bhp)
71 {
72         return gfs2_meta_buffer(ip, GFS2_METATYPE_DI, ip->i_no_addr, bhp);
73 }
74
75 struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen);
76
77 #define buffer_busy(bh) \
78 ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned)))
79
80 #endif /* __DIO_DOT_H__ */
81