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
gfs2_buffer_clear(struct buffer_head * bh)17 static inline void gfs2_buffer_clear(struct buffer_head *bh)
18 {
19 memset(bh->b_data, 0, bh->b_size);
20 }
21
gfs2_buffer_clear_tail(struct buffer_head * bh,int head)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
gfs2_buffer_copy_tail(struct buffer_head * to_bh,int to_head,struct buffer_head * from_bh,int from_head)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 extern const struct address_space_operations gfs2_meta_aops;
41 extern const struct address_space_operations gfs2_rgrp_aops;
42
gfs2_mapping2sbd(struct address_space * mapping)43 static inline struct gfs2_sbd *gfs2_mapping2sbd(struct address_space *mapping)
44 {
45 struct inode *inode = mapping->host;
46 if (mapping->a_ops == &gfs2_meta_aops)
47 return (((struct gfs2_glock *)mapping) - 1)->gl_name.ln_sbd;
48 else if (mapping->a_ops == &gfs2_rgrp_aops)
49 return container_of(mapping, struct gfs2_sbd, sd_aspace);
50 else
51 return inode->i_sb->s_fs_info;
52 }
53
54 extern struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno);
55 extern int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
56 int rahead, struct buffer_head **bhp);
57 extern int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh);
58 extern struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno,
59 int create);
60 enum {
61 REMOVE_JDATA = 0,
62 REMOVE_META = 1,
63 };
64
65 extern void gfs2_remove_from_journal(struct buffer_head *bh, int meta);
66 extern void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen);
67 extern int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
68 struct buffer_head **bhp);
69
gfs2_meta_inode_buffer(struct gfs2_inode * ip,struct buffer_head ** bhp)70 static 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, bhp);
74 }
75
76 struct 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
81 #endif /* __DIO_DOT_H__ */
82
83