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https://github.com/edk2-porting/linux-next.git
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15562c439d
What uniquely identifies a glock in the glock hash table is not gl_name, but gl_name and its superblock pointer. This patch makes the gl_name field correspond to a unique glock identifier. That will allow us to simplify hashing with a future patch, since the hash algorithm can then take the gl_name and hash its components in one operation. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Acked-by: Steven Whitehouse <swhiteho@redhat.com>
79 lines
2.5 KiB
C
79 lines
2.5 KiB
C
/*
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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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extern const struct address_space_operations gfs2_meta_aops;
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extern const struct address_space_operations gfs2_rgrp_aops;
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static inline struct gfs2_sbd *gfs2_mapping2sbd(struct address_space *mapping)
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{
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struct inode *inode = mapping->host;
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if (mapping->a_ops == &gfs2_meta_aops)
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return (((struct gfs2_glock *)mapping) - 1)->gl_name.ln_sbd;
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else if (mapping->a_ops == &gfs2_rgrp_aops)
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return container_of(mapping, struct gfs2_sbd, sd_aspace);
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else
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return inode->i_sb->s_fs_info;
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}
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extern struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno);
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extern int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
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struct buffer_head **bhp);
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extern int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh);
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extern struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno,
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int create);
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extern void gfs2_remove_from_journal(struct buffer_head *bh,
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struct gfs2_trans *tr, int meta);
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extern void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen);
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extern int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
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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, 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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#endif /* __DIO_DOT_H__ */
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