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
17 static inline void gfs2_buffer_clear(struct buffer_head *bh)
18 {
19 memset(bh->b_data, 0, bh->b_size);
20 }
21
22 static 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
28 static 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
40 struct inode *gfs2_aspace_get(struct gfs2_sbd *sdp);
41 void gfs2_aspace_put(struct inode *aspace);
42
43 void gfs2_meta_inval(struct gfs2_glock *gl);
44 void gfs2_meta_sync(struct gfs2_glock *gl);
45
46 struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno);
47 int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno,
48 int flags, struct buffer_head **bhp);
49 int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh);
50
51 void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh,
52 int meta);
53
54 void gfs2_remove_from_journal(struct buffer_head *bh, struct gfs2_trans *tr,
55 int meta);
56
57 void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen);
58
59 int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
60 int new, struct buffer_head **bhp);
61
62 static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip,
63 struct buffer_head **bhp)
64 {
65 return gfs2_meta_indirect_buffer(ip, 0, ip->i_no_addr, 0, bhp);
66 }
67
68 struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen);
69
70 #define buffer_busy(bh) \
71 ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned)))
72 #define buffer_in_io(bh) \
73 ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock)))
74
75 #endif /* __DIO_DOT_H__ */
76
77
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