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
gfs2_buffer_clear(struct buffer_head * bh)14 static inline void gfs2_buffer_clear(struct buffer_head *bh)
15 {
16 memset(bh->b_data, 0, bh->b_size);
17 }
18
gfs2_buffer_clear_tail(struct buffer_head * bh,int head)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
gfs2_buffer_copy_tail(struct buffer_head * to_bh,int to_head,struct buffer_head * from_bh,int from_head)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
gfs2_mapping2sbd(struct address_space * mapping)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 return (((struct gfs2_glock *)mapping) - 1)->gl_name.ln_sbd;
45 else if (mapping->a_ops == &gfs2_rgrp_aops)
46 return container_of(mapping, struct gfs2_sbd, sd_aspace);
47 else
48 return inode->i_sb->s_fs_info;
49 }
50
51 extern struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno);
52 extern int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
53 int rahead, struct buffer_head **bhp);
54 extern int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh);
55 extern struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno,
56 int create);
57 enum {
58 REMOVE_JDATA = 0,
59 REMOVE_META = 1,
60 };
61
62 extern void gfs2_remove_from_journal(struct buffer_head *bh, int meta);
63 extern void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen);
64 extern int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
65 struct buffer_head **bhp);
66
gfs2_meta_inode_buffer(struct gfs2_inode * ip,struct buffer_head ** bhp)67 static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip,
68 struct buffer_head **bhp)
69 {
70 return gfs2_meta_indirect_buffer(ip, 0, ip->i_no_addr, bhp);
71 }
72
73 struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen);
74
75 #define buffer_busy(bh) \
76 ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned)))
77
78 #endif /* __DIO_DOT_H__ */
79
80
