tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 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 __DIO_DOT_H__
11#define __DIO_DOT_H__
12
13#include <linux/buffer_head.h>
14#include <linux/string.h>
15#include "incore.h"
16
17static inline void gfs2_buffer_clear(struct buffer_head *bh)
18{
19 memset(bh->b_data, 0, bh->b_size);
20}
21
22static inline void gfs2_buffer_clear_tail(struct buffer_head *bh, int head)
23{
24 BUG_ON(head > bh->b_size);
25 memset(bh->b_data + head, 0, bh->b_size - head);
26}
27
28static inline void gfs2_buffer_copy_tail(struct buffer_head *to_bh,
29 int to_head,
30 struct buffer_head *from_bh,
31 int from_head)
32{
33 BUG_ON(from_head < to_head);
34 memcpy(to_bh->b_data + to_head, from_bh->b_data + from_head,
35 from_bh->b_size - from_head);
36 memset(to_bh->b_data + to_bh->b_size + to_head - from_head,
37 0, from_head - to_head);
38}
39
40extern const struct address_space_operations gfs2_meta_aops;
41
42static inline struct gfs2_sbd *gfs2_mapping2sbd(struct address_space *mapping)
43{
44 struct inode *inode = mapping->host;
45 if (mapping->a_ops == &gfs2_meta_aops)
46 return (((struct gfs2_glock *)mapping) - 1)->gl_sbd;
47 else
48 return inode->i_sb->s_fs_info;
49}
50
51void gfs2_meta_sync(struct gfs2_glock *gl);
52
53struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno);
54int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno,
55 int flags, 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, int create);
58
59void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh,
60 int meta);
61
62void gfs2_remove_from_journal(struct buffer_head *bh, struct gfs2_trans *tr,
63 int meta);
64
65void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen);
66
67int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
68 int new, struct buffer_head **bhp);
69
70static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip,
71 struct buffer_head **bhp)
72{
73 return gfs2_meta_indirect_buffer(ip, 0, ip->i_no_addr, 0, bhp);
74}
75
76struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen);
77
78#define buffer_busy(bh) \
79((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned)))
80#define buffer_in_io(bh) \
81((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock)))
82
83#endif /* __DIO_DOT_H__ */
84