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 | |
14 | static inline void gfs2_buffer_clear(struct buffer_head *bh) |
15 | { |
16 | memset(bh->b_data, 0, bh->b_size); |
17 | } |
18 | |
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 | |
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 | |
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 | struct gfs2_glock_aspace *gla = |
45 | container_of(mapping, struct gfs2_glock_aspace, mapping); |
46 | return gla->glock.gl_name.ln_sbd; |
47 | } else if (mapping->a_ops == &gfs2_rgrp_aops) |
48 | return container_of(mapping, struct gfs2_sbd, sd_aspace); |
49 | else |
50 | return inode->i_sb->s_fs_info; |
51 | } |
52 | |
53 | struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno); |
54 | int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags, |
55 | int rahead, struct buffer_head **bhp); |
56 | int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh); |
57 | struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, |
58 | int create); |
59 | enum { |
60 | REMOVE_JDATA = 0, |
61 | REMOVE_META = 1, |
62 | }; |
63 | |
64 | void gfs2_remove_from_journal(struct buffer_head *bh, int meta); |
65 | void gfs2_journal_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen); |
66 | int gfs2_meta_buffer(struct gfs2_inode *ip, u32 mtype, u64 num, |
67 | struct buffer_head **bhp); |
68 | |
69 | static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip, |
70 | struct buffer_head **bhp) |
71 | { |
72 | return gfs2_meta_buffer(ip, GFS2_METATYPE_DI, num: ip->i_no_addr, bhp); |
73 | } |
74 | |
75 | struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen); |
76 | |
77 | #define buffer_busy(bh) \ |
78 | ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned))) |
79 | |
80 | #endif /* __DIO_DOT_H__ */ |
81 | |
82 | |