54335b1fca
This means that after the initial allocation for any inode, the last used resource group is cached in the inode for future use. This drastically reduces the number of lookups of resource groups in the common case, and this the contention on that data structure. The allocation algorithm is the same as previously, except that we always check to see if the goal block is within the cached rgrp first before going to the rbtree to look one up. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
48 lines
1.5 KiB
C
48 lines
1.5 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 __TRANS_DOT_H__
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#define __TRANS_DOT_H__
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#include <linux/buffer_head.h>
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struct gfs2_sbd;
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struct gfs2_rgrpd;
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struct gfs2_glock;
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#define RES_DINODE 1
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#define RES_INDIRECT 1
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#define RES_JDATA 1
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#define RES_DATA 1
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#define RES_LEAF 1
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#define RES_RG_HDR 1
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#define RES_RG_BIT 2
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#define RES_EATTR 1
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#define RES_STATFS 1
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#define RES_QUOTA 2
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/* reserve either the number of blocks to be allocated plus the rg header
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* block, or all of the blocks in the rg, whichever is smaller */
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static inline unsigned int gfs2_rg_blocks(const struct gfs2_inode *ip)
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{
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const struct gfs2_alloc *al = ip->i_alloc;
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if (al->al_requested < ip->i_rgd->rd_length)
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return al->al_requested + 1;
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return ip->i_rgd->rd_length;
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}
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extern int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
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unsigned int revokes);
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extern void gfs2_trans_end(struct gfs2_sbd *sdp);
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extern void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta);
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extern void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd);
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extern void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len);
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#endif /* __TRANS_DOT_H__ */
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