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https://github.com/torvalds/linux
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f91a0d3e24
The i_cache was designed to keep references to the indirect blocks used during block mapping so that they didn't have to be looked up continually. The idea failed because there are too many places where the i_cache needs to be freed, and this has in the past been the cause of many bugs. In addition there was no performance benefit being gained since the disk blocks in question were cached anyway. So this patch removes it in order to simplify the code to prepare for other changes which would otherwise have had to add further support for this feature. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
68 lines
1.8 KiB
C
68 lines
1.8 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 __LOG_DOT_H__
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#define __LOG_DOT_H__
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include "incore.h"
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/**
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* gfs2_log_lock - acquire the right to mess with the log manager
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* @sdp: the filesystem
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*
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*/
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static inline void gfs2_log_lock(struct gfs2_sbd *sdp)
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{
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spin_lock(&sdp->sd_log_lock);
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}
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/**
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* gfs2_log_unlock - release the right to mess with the log manager
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* @sdp: the filesystem
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*
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*/
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static inline void gfs2_log_unlock(struct gfs2_sbd *sdp)
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{
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spin_unlock(&sdp->sd_log_lock);
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}
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static inline void gfs2_log_pointers_init(struct gfs2_sbd *sdp,
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unsigned int value)
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{
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if (++value == sdp->sd_jdesc->jd_blocks) {
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value = 0;
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}
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sdp->sd_log_head = sdp->sd_log_tail = value;
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}
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unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct,
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unsigned int ssize);
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int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags);
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int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks);
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void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks);
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void gfs2_log_incr_head(struct gfs2_sbd *sdp);
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struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp);
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struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp,
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struct buffer_head *real);
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void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl);
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void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *trans);
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void gfs2_remove_from_ail(struct gfs2_bufdata *bd);
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void gfs2_log_shutdown(struct gfs2_sbd *sdp);
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void gfs2_meta_syncfs(struct gfs2_sbd *sdp);
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#endif /* __LOG_DOT_H__ */
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