1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-only */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4*4882a593Smuzhiyun * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #ifndef __DIO_DOT_H__
8*4882a593Smuzhiyun #define __DIO_DOT_H__
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/buffer_head.h>
11*4882a593Smuzhiyun #include <linux/string.h>
12*4882a593Smuzhiyun #include "incore.h"
13*4882a593Smuzhiyun
gfs2_buffer_clear(struct buffer_head * bh)14*4882a593Smuzhiyun static inline void gfs2_buffer_clear(struct buffer_head *bh)
15*4882a593Smuzhiyun {
16*4882a593Smuzhiyun memset(bh->b_data, 0, bh->b_size);
17*4882a593Smuzhiyun }
18*4882a593Smuzhiyun
gfs2_buffer_clear_tail(struct buffer_head * bh,int head)19*4882a593Smuzhiyun static inline void gfs2_buffer_clear_tail(struct buffer_head *bh, int head)
20*4882a593Smuzhiyun {
21*4882a593Smuzhiyun BUG_ON(head > bh->b_size);
22*4882a593Smuzhiyun memset(bh->b_data + head, 0, bh->b_size - head);
23*4882a593Smuzhiyun }
24*4882a593Smuzhiyun
gfs2_buffer_copy_tail(struct buffer_head * to_bh,int to_head,struct buffer_head * from_bh,int from_head)25*4882a593Smuzhiyun static inline void gfs2_buffer_copy_tail(struct buffer_head *to_bh,
26*4882a593Smuzhiyun int to_head,
27*4882a593Smuzhiyun struct buffer_head *from_bh,
28*4882a593Smuzhiyun int from_head)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun BUG_ON(from_head < to_head);
31*4882a593Smuzhiyun memcpy(to_bh->b_data + to_head, from_bh->b_data + from_head,
32*4882a593Smuzhiyun from_bh->b_size - from_head);
33*4882a593Smuzhiyun memset(to_bh->b_data + to_bh->b_size + to_head - from_head,
34*4882a593Smuzhiyun 0, from_head - to_head);
35*4882a593Smuzhiyun }
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun extern const struct address_space_operations gfs2_meta_aops;
38*4882a593Smuzhiyun extern const struct address_space_operations gfs2_rgrp_aops;
39*4882a593Smuzhiyun
gfs2_mapping2sbd(struct address_space * mapping)40*4882a593Smuzhiyun static inline struct gfs2_sbd *gfs2_mapping2sbd(struct address_space *mapping)
41*4882a593Smuzhiyun {
42*4882a593Smuzhiyun struct inode *inode = mapping->host;
43*4882a593Smuzhiyun if (mapping->a_ops == &gfs2_meta_aops)
44*4882a593Smuzhiyun return (((struct gfs2_glock *)mapping) - 1)->gl_name.ln_sbd;
45*4882a593Smuzhiyun else if (mapping->a_ops == &gfs2_rgrp_aops)
46*4882a593Smuzhiyun return container_of(mapping, struct gfs2_sbd, sd_aspace);
47*4882a593Smuzhiyun else
48*4882a593Smuzhiyun return inode->i_sb->s_fs_info;
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun extern struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno);
52*4882a593Smuzhiyun extern int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
53*4882a593Smuzhiyun int rahead, struct buffer_head **bhp);
54*4882a593Smuzhiyun extern int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh);
55*4882a593Smuzhiyun extern struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno,
56*4882a593Smuzhiyun int create);
57*4882a593Smuzhiyun enum {
58*4882a593Smuzhiyun REMOVE_JDATA = 0,
59*4882a593Smuzhiyun REMOVE_META = 1,
60*4882a593Smuzhiyun };
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun extern void gfs2_remove_from_journal(struct buffer_head *bh, int meta);
63*4882a593Smuzhiyun extern void gfs2_journal_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen);
64*4882a593Smuzhiyun extern int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
65*4882a593Smuzhiyun struct buffer_head **bhp);
66*4882a593Smuzhiyun
gfs2_meta_inode_buffer(struct gfs2_inode * ip,struct buffer_head ** bhp)67*4882a593Smuzhiyun static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip,
68*4882a593Smuzhiyun struct buffer_head **bhp)
69*4882a593Smuzhiyun {
70*4882a593Smuzhiyun return gfs2_meta_indirect_buffer(ip, 0, ip->i_no_addr, bhp);
71*4882a593Smuzhiyun }
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen);
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun #define buffer_busy(bh) \
76*4882a593Smuzhiyun ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned)))
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun #endif /* __DIO_DOT_H__ */
79*4882a593Smuzhiyun
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