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gerrit-public.fairphone.software / kernel / msm-4.9 / 7f94af7a489fada17d28cc60e8f4409ce216bd6d / . / fs / gfs2 / meta_io.h
blob: 8ca161567a93c549470068e2f5b980eba4f7057b [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Steven Whitehouse3a8a9a12006-05-18 15:09:15 -0400[diff] [blame]3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]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
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -0400[diff] [blame]7 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]8 */
9
10#ifndef __DIO_DOT_H__
11#define __DIO_DOT_H__
12
Steven Whitehousef2f7ba52006-09-05 10:39:21 -0400[diff] [blame]13#include <linux/buffer_head.h>
14#include <linux/string.h>
15#include "incore.h"
16
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]17static inline void gfs2_buffer_clear(struct buffer_head *bh)
18{
19 memset(bh->b_data, 0, bh->b_size);
20}
21
22static inline void gfs2_buffer_clear_tail(struct buffer_head *bh, int head)
23{
Steven Whitehouse420b9e52006-07-31 15:42:17 -0400[diff] [blame]24 BUG_ON(head > bh->b_size);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]25 memset(bh->b_data + head, 0, bh->b_size - head);
26}
27
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]28static 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{
Steven Whitehouse420b9e52006-07-31 15:42:17 -0400[diff] [blame]33 BUG_ON(from_head < to_head);
34 memcpy(to_bh->b_data + to_head, from_bh->b_data + from_head,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]35 from_bh->b_size - from_head);
36 memset(to_bh->b_data + to_bh->b_size + to_head - from_head,
Steven Whitehouse420b9e52006-07-31 15:42:17 -0400[diff] [blame]37 0, from_head - to_head);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]38}
39
Steven Whitehouse009d8512009-12-08 12:12:13 +0000[diff] [blame]40extern const struct address_space_operations gfs2_meta_aops;
Steven Whitehouse1b2ad412014-03-31 17:48:27 +0100[diff] [blame]41extern const struct address_space_operations gfs2_rgrp_aops;
Steven Whitehouse009d8512009-12-08 12:12:13 +0000[diff] [blame]42
43static 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)
Bob Peterson15562c42015-03-16 11:52:05 -0500[diff] [blame]47 return (((struct gfs2_glock *)mapping) - 1)->gl_name.ln_sbd;
Steven Whitehouse1b2ad412014-03-31 17:48:27 +0100[diff] [blame]48 else if (mapping->a_ops == &gfs2_rgrp_aops)
49 return container_of(mapping, struct gfs2_sbd, sd_aspace);
Steven Whitehouse009d8512009-12-08 12:12:13 +0000[diff] [blame]50 else
51 return inode->i_sb->s_fs_info;
52}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]53
Steven Whitehouse7c0ef282013-07-03 15:13:32 +0100[diff] [blame]54extern struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno);
55extern int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
56 struct buffer_head **bhp);
57extern int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh);
58extern struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno,
59 int create);
60extern void gfs2_remove_from_journal(struct buffer_head *bh,
61 struct gfs2_trans *tr, int meta);
62extern void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen);
63extern int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
64 struct buffer_head **bhp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]65
66static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip,
67 struct buffer_head **bhp)
68{
Bob Petersonf2f9c812012-05-10 08:33:55 -0400[diff] [blame]69 return gfs2_meta_indirect_buffer(ip, 0, ip->i_no_addr, bhp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]70}
71
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400[diff] [blame]72struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]73
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400[diff] [blame]74#define buffer_busy(bh) \
75((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned)))
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400[diff] [blame]76
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]77#endif /* __DIO_DOT_H__ */
78