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gerrit-public.fairphone.software / kernel / msm-4.9 / 782e3b3b3804c38d5130c7f21d7ec7bf6709023f / . / fs / gfs2 / meta_io.h
blob: 527bf19d9690f5c58203e1ca1c3fbb0b1e5fa8ae [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
40struct inode *gfs2_aspace_get(struct gfs2_sbd *sdp);
41void gfs2_aspace_put(struct inode *aspace);
42
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]43void gfs2_meta_inval(struct gfs2_glock *gl);
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400[diff] [blame]44void gfs2_meta_sync(struct gfs2_glock *gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]45
Steven Whitehousecd915492006-09-04 12:49:07 -0400[diff] [blame]46struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno);
47int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]48 int flags, struct buffer_head **bhp);
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400[diff] [blame]49int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]50
Steven Whitehouse568f4c92006-02-27 12:00:42 -0500[diff] [blame]51void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh,
52 int meta);
Steven Whitehousea98ab222006-01-18 13:38:44 +0000[diff] [blame]53void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh);
54void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
55 struct gfs2_ail *ai);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]56
Steven Whitehousecd915492006-09-04 12:49:07 -0400[diff] [blame]57void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]58
59void gfs2_meta_cache_flush(struct gfs2_inode *ip);
Steven Whitehousecd915492006-09-04 12:49:07 -0400[diff] [blame]60int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]61 int new, struct buffer_head **bhp);
62
63static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip,
64 struct buffer_head **bhp)
65{
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100[diff] [blame]66 return gfs2_meta_indirect_buffer(ip, 0, ip->i_no_addr, 0, bhp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]67}
68
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400[diff] [blame]69struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]70
Steven Whitehouseddacfaf2006-10-03 11:10:41 -0400[diff] [blame]71#define buffer_busy(bh) \
72((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned)))
73#define buffer_in_io(bh) \
74((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock)))
75
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]76#endif /* __DIO_DOT_H__ */
77