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
14static inline void gfs2_buffer_clear(struct buffer_head *bh)
15{
16 memset(bh->b_data, 0, bh->b_size);
17}
18
19static 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
25static 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
37extern const struct address_space_operations gfs2_meta_aops;
38extern const struct address_space_operations gfs2_rgrp_aops;
39
40static 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
53struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno);
54int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
55 int rahead, struct buffer_head **bhp);
56int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh);
57struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno,
58 int create);
59enum {
60 REMOVE_JDATA = 0,
61 REMOVE_META = 1,
62};
63
64void gfs2_remove_from_journal(struct buffer_head *bh, int meta);
65void gfs2_journal_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen);
66int gfs2_meta_buffer(struct gfs2_inode *ip, u32 mtype, u64 num,
67 struct buffer_head **bhp);
68
69static 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, num: ip->i_no_addr, bhp);
73}
74
75struct 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
82

source code of linux/fs/gfs2/meta_io.h