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https://github.com/torvalds/linux
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68942870c6
Before this patch, when blocks were freed, it called gfs2_meta_wipe to take the metadata out of the pending journal blocks. It did this mostly by calling another function called gfs2_remove_from_journal. This is shortsighted because it does not do anything with jdata blocks which may also be in the journal. This patch expands the function so that it wipes out jdata blocks from the journal as well, and it wipes it from the ail1 list if it hasn't been written back yet. Since it now processes jdata blocks as well, the function has been renamed from gfs2_meta_wipe to gfs2_journal_wipe. New function gfs2_ail1_wipe wants a static view of the ail list, so it locks the sd_ail_lock when removing items. To accomplish this, function gfs2_remove_from_journal no longer locks the sd_ail_lock, and it's now the caller's responsibility to do so. I was going to make sd_ail_lock locking conditional, but the practice is generally frowned upon. For details, see: https://lwn.net/Articles/109066/ Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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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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#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 <linux/writeback.h>
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#include "incore.h"
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#include "inode.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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__acquires(&sdp->sd_log_lock)
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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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__releases(&sdp->sd_log_lock)
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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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static inline void gfs2_ordered_add_inode(struct gfs2_inode *ip)
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{
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struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
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if (gfs2_is_jdata(ip) || !gfs2_is_ordered(sdp))
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return;
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if (list_empty(&ip->i_ordered)) {
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spin_lock(&sdp->sd_ordered_lock);
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if (list_empty(&ip->i_ordered))
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list_add(&ip->i_ordered, &sdp->sd_log_ordered);
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spin_unlock(&sdp->sd_ordered_lock);
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}
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}
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extern void gfs2_ordered_del_inode(struct gfs2_inode *ip);
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extern unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct);
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extern void gfs2_remove_from_ail(struct gfs2_bufdata *bd);
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extern void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks);
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extern int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks);
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extern void gfs2_write_log_header(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd,
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u64 seq, u32 tail, u32 lblock, u32 flags,
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int op_flags);
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extern void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl,
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u32 type);
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extern void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *trans);
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extern void gfs2_ail1_flush(struct gfs2_sbd *sdp, struct writeback_control *wbc);
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extern void log_flush_wait(struct gfs2_sbd *sdp);
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extern int gfs2_logd(void *data);
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extern void gfs2_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd);
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extern void gfs2_glock_remove_revoke(struct gfs2_glock *gl);
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extern void gfs2_write_revokes(struct gfs2_sbd *sdp);
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#endif /* __LOG_DOT_H__ */
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