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Thomas Gleixner7336d0e2019-05-31 01:09:56 -07001/* SPDX-License-Identifier: GPL-2.0-only */
David Teiglandb3b94fa2006-01-16 16:50:04 +00002/*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Steven Whitehouse3a8a9a12006-05-18 15:09:15 -04004 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00005 */
6
7#ifndef __DIO_DOT_H__
8#define __DIO_DOT_H__
9
Steven Whitehousef2f7ba52006-09-05 10:39:21 -040010#include <linux/buffer_head.h>
11#include <linux/string.h>
12#include "incore.h"
13
David Teiglandb3b94fa2006-01-16 16:50:04 +000014static inline void gfs2_buffer_clear(struct buffer_head *bh)
15{
16 memset(bh->b_data, 0, bh->b_size);
17}
18
19static inline void gfs2_buffer_clear_tail(struct buffer_head *bh, int head)
20{
Steven Whitehouse420b9e52006-07-31 15:42:17 -040021 BUG_ON(head > bh->b_size);
David Teiglandb3b94fa2006-01-16 16:50:04 +000022 memset(bh->b_data + head, 0, bh->b_size - head);
23}
24
David Teiglandb3b94fa2006-01-16 16:50:04 +000025static 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{
Steven Whitehouse420b9e52006-07-31 15:42:17 -040030 BUG_ON(from_head < to_head);
31 memcpy(to_bh->b_data + to_head, from_bh->b_data + from_head,
David Teiglandb3b94fa2006-01-16 16:50:04 +000032 from_bh->b_size - from_head);
33 memset(to_bh->b_data + to_bh->b_size + to_head - from_head,
Steven Whitehouse420b9e52006-07-31 15:42:17 -040034 0, from_head - to_head);
David Teiglandb3b94fa2006-01-16 16:50:04 +000035}
36
Steven Whitehouse009d8512009-12-08 12:12:13 +000037extern const struct address_space_operations gfs2_meta_aops;
Steven Whitehouse1b2ad412014-03-31 17:48:27 +010038extern const struct address_space_operations gfs2_rgrp_aops;
Steven Whitehouse009d8512009-12-08 12:12:13 +000039
40static 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)
Bob Peterson15562c42015-03-16 11:52:05 -050044 return (((struct gfs2_glock *)mapping) - 1)->gl_name.ln_sbd;
Steven Whitehouse1b2ad412014-03-31 17:48:27 +010045 else if (mapping->a_ops == &gfs2_rgrp_aops)
46 return container_of(mapping, struct gfs2_sbd, sd_aspace);
Steven Whitehouse009d8512009-12-08 12:12:13 +000047 else
48 return inode->i_sb->s_fs_info;
49}
David Teiglandb3b94fa2006-01-16 16:50:04 +000050
Steven Whitehouse7c0ef282013-07-03 15:13:32 +010051extern struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno);
52extern int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
Andreas Gruenbacherc8d57702015-11-11 15:00:35 -060053 int rahead, struct buffer_head **bhp);
Steven Whitehouse7c0ef282013-07-03 15:13:32 +010054extern int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh);
55extern struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno,
56 int create);
Bob Peterson68cd4ce2016-05-02 11:53:35 -050057enum {
58 REMOVE_JDATA = 0,
59 REMOVE_META = 1,
60};
61
62extern void gfs2_remove_from_journal(struct buffer_head *bh, int meta);
Steven Whitehouse7c0ef282013-07-03 15:13:32 +010063extern void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen);
64extern int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
65 struct buffer_head **bhp);
David Teiglandb3b94fa2006-01-16 16:50:04 +000066
67static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip,
68 struct buffer_head **bhp)
69{
Bob Petersonf2f9c812012-05-10 08:33:55 -040070 return gfs2_meta_indirect_buffer(ip, 0, ip->i_no_addr, bhp);
David Teiglandb3b94fa2006-01-16 16:50:04 +000071}
72
Steven Whitehouse7276b3b2006-09-21 17:05:23 -040073struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen);
David Teiglandb3b94fa2006-01-16 16:50:04 +000074
Steven Whitehouseddacfaf2006-10-03 11:10:41 -040075#define buffer_busy(bh) \
76((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned)))
Steven Whitehouseddacfaf2006-10-03 11:10:41 -040077
David Teiglandb3b94fa2006-01-16 16:50:04 +000078#endif /* __DIO_DOT_H__ */
79