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marcus.erl |
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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#ifndef __DIO_DOT_H__
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#define __DIO_DOT_H__
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#include <linux/buffer_head.h>
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#include <linux/string.h>
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#include "incore.h"
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static inline void gfs2_buffer_clear(struct buffer_head *bh)
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{
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memset(bh->b_data, 0, bh->b_size);
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}
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static inline void gfs2_buffer_clear_tail(struct buffer_head *bh, int head)
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{
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BUG_ON(head > bh->b_size);
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memset(bh->b_data + head, 0, bh->b_size - head);
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}
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static inline void gfs2_buffer_copy_tail(struct buffer_head *to_bh,
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int to_head,
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struct buffer_head *from_bh,
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int from_head)
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{
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BUG_ON(from_head < to_head);
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memcpy(to_bh->b_data + to_head, from_bh->b_data + from_head,
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from_bh->b_size - from_head);
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memset(to_bh->b_data + to_bh->b_size + to_head - from_head,
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0, from_head - to_head);
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}
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struct inode *gfs2_aspace_get(struct gfs2_sbd *sdp);
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void gfs2_aspace_put(struct inode *aspace);
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void gfs2_meta_inval(struct gfs2_glock *gl);
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void gfs2_meta_sync(struct gfs2_glock *gl);
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struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno);
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int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno,
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int flags, struct buffer_head **bhp);
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int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh);
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void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh,
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int meta);
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void gfs2_remove_from_journal(struct buffer_head *bh, struct gfs2_trans *tr,
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int meta);
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void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen);
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void gfs2_meta_cache_flush(struct gfs2_inode *ip);
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int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
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int new, struct buffer_head **bhp);
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static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip,
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struct buffer_head **bhp)
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{
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return gfs2_meta_indirect_buffer(ip, 0, ip->i_no_addr, 0, bhp);
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}
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struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen);
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#define buffer_busy(bh) \
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((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned)))
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#define buffer_in_io(bh) \
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((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock)))
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#endif /* __DIO_DOT_H__ */
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