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5ac048bb7e
In order to ensure that the mapping stats (and thus the bdi) are correctly updated, this patch changes the AIL writeback to use the filemap_datawrite function. This helps prevent stalls in balance_dirty_pages() due to large amounts of dirty metadata when there is little or no dirty data around. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
937 lines
24 KiB
C
937 lines
24 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2007 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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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/crc32.h>
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#include <linux/delay.h>
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#include <linux/kthread.h>
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#include <linux/freezer.h>
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#include <linux/bio.h>
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#include "gfs2.h"
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#include "incore.h"
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#include "bmap.h"
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#include "glock.h"
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#include "log.h"
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#include "lops.h"
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#include "meta_io.h"
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#include "util.h"
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#include "dir.h"
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#include "trace_gfs2.h"
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#define PULL 1
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/**
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* gfs2_struct2blk - compute stuff
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* @sdp: the filesystem
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* @nstruct: the number of structures
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* @ssize: the size of the structures
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*
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* Compute the number of log descriptor blocks needed to hold a certain number
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* of structures of a certain size.
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*
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* Returns: the number of blocks needed (minimum is always 1)
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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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{
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unsigned int blks;
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unsigned int first, second;
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blks = 1;
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first = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / ssize;
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if (nstruct > first) {
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second = (sdp->sd_sb.sb_bsize -
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sizeof(struct gfs2_meta_header)) / ssize;
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blks += DIV_ROUND_UP(nstruct - first, second);
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}
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return blks;
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}
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/**
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* gfs2_remove_from_ail - Remove an entry from the ail lists, updating counters
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* @mapping: The associated mapping (maybe NULL)
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* @bd: The gfs2_bufdata to remove
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*
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* The ail lock _must_ be held when calling this function
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*
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*/
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void gfs2_remove_from_ail(struct gfs2_bufdata *bd)
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{
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bd->bd_ail = NULL;
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list_del_init(&bd->bd_ail_st_list);
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list_del_init(&bd->bd_ail_gl_list);
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atomic_dec(&bd->bd_gl->gl_ail_count);
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brelse(bd->bd_bh);
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}
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/**
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* gfs2_ail1_start_one - Start I/O on a part of the AIL
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* @sdp: the filesystem
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* @tr: the part of the AIL
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*
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*/
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static void gfs2_ail1_start_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
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__releases(&sdp->sd_ail_lock)
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__acquires(&sdp->sd_ail_lock)
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{
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struct gfs2_glock *gl = NULL;
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struct gfs2_bufdata *bd, *s;
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struct buffer_head *bh;
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int retry;
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do {
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retry = 0;
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list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list,
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bd_ail_st_list) {
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bh = bd->bd_bh;
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gfs2_assert(sdp, bd->bd_ail == ai);
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if (!buffer_busy(bh)) {
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if (!buffer_uptodate(bh))
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gfs2_io_error_bh(sdp, bh);
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list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list);
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continue;
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}
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if (!buffer_dirty(bh))
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continue;
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if (gl == bd->bd_gl)
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continue;
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gl = bd->bd_gl;
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list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list);
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spin_unlock(&sdp->sd_ail_lock);
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filemap_fdatawrite(gfs2_glock2aspace(gl));
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spin_lock(&sdp->sd_ail_lock);
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retry = 1;
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break;
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}
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} while (retry);
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}
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/**
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* gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced
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* @sdp: the filesystem
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* @ai: the AIL entry
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*
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*/
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static int gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai, int flags)
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{
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struct gfs2_bufdata *bd, *s;
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struct buffer_head *bh;
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list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list,
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bd_ail_st_list) {
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bh = bd->bd_bh;
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gfs2_assert(sdp, bd->bd_ail == ai);
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if (buffer_busy(bh)) {
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if (flags & DIO_ALL)
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continue;
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else
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break;
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}
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if (!buffer_uptodate(bh))
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gfs2_io_error_bh(sdp, bh);
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list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list);
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}
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return list_empty(&ai->ai_ail1_list);
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}
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static void gfs2_ail1_start(struct gfs2_sbd *sdp)
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{
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struct list_head *head;
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u64 sync_gen;
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struct gfs2_ail *ai;
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int done = 0;
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spin_lock(&sdp->sd_ail_lock);
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head = &sdp->sd_ail1_list;
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if (list_empty(head)) {
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spin_unlock(&sdp->sd_ail_lock);
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return;
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}
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sync_gen = sdp->sd_ail_sync_gen++;
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while(!done) {
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done = 1;
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list_for_each_entry_reverse(ai, head, ai_list) {
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if (ai->ai_sync_gen >= sync_gen)
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continue;
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ai->ai_sync_gen = sync_gen;
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gfs2_ail1_start_one(sdp, ai); /* This may drop ail lock */
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done = 0;
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break;
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}
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}
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spin_unlock(&sdp->sd_ail_lock);
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}
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static int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags)
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{
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struct gfs2_ail *ai, *s;
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int ret;
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spin_lock(&sdp->sd_ail_lock);
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list_for_each_entry_safe_reverse(ai, s, &sdp->sd_ail1_list, ai_list) {
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if (gfs2_ail1_empty_one(sdp, ai, flags))
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list_move(&ai->ai_list, &sdp->sd_ail2_list);
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else if (!(flags & DIO_ALL))
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break;
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}
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ret = list_empty(&sdp->sd_ail1_list);
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spin_unlock(&sdp->sd_ail_lock);
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return ret;
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}
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/**
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* gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced
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* @sdp: the filesystem
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* @ai: the AIL entry
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*
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*/
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static void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
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{
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struct list_head *head = &ai->ai_ail2_list;
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struct gfs2_bufdata *bd;
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while (!list_empty(head)) {
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bd = list_entry(head->prev, struct gfs2_bufdata,
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bd_ail_st_list);
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gfs2_assert(sdp, bd->bd_ail == ai);
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gfs2_remove_from_ail(bd);
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}
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}
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static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail)
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{
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struct gfs2_ail *ai, *safe;
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unsigned int old_tail = sdp->sd_log_tail;
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int wrap = (new_tail < old_tail);
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int a, b, rm;
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spin_lock(&sdp->sd_ail_lock);
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list_for_each_entry_safe(ai, safe, &sdp->sd_ail2_list, ai_list) {
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a = (old_tail <= ai->ai_first);
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b = (ai->ai_first < new_tail);
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rm = (wrap) ? (a || b) : (a && b);
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if (!rm)
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continue;
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gfs2_ail2_empty_one(sdp, ai);
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list_del(&ai->ai_list);
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gfs2_assert_warn(sdp, list_empty(&ai->ai_ail1_list));
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gfs2_assert_warn(sdp, list_empty(&ai->ai_ail2_list));
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kfree(ai);
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}
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spin_unlock(&sdp->sd_ail_lock);
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}
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/**
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* gfs2_log_reserve - Make a log reservation
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* @sdp: The GFS2 superblock
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* @blks: The number of blocks to reserve
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*
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* Note that we never give out the last few blocks of the journal. Thats
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* due to the fact that there is a small number of header blocks
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* associated with each log flush. The exact number can't be known until
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* flush time, so we ensure that we have just enough free blocks at all
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* times to avoid running out during a log flush.
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*
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* We no longer flush the log here, instead we wake up logd to do that
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* for us. To avoid the thundering herd and to ensure that we deal fairly
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* with queued waiters, we use an exclusive wait. This means that when we
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* get woken with enough journal space to get our reservation, we need to
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* wake the next waiter on the list.
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*
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* Returns: errno
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*/
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int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks)
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{
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unsigned reserved_blks = 6 * (4096 / sdp->sd_vfs->s_blocksize);
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unsigned wanted = blks + reserved_blks;
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DEFINE_WAIT(wait);
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int did_wait = 0;
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unsigned int free_blocks;
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if (gfs2_assert_warn(sdp, blks) ||
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gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks))
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return -EINVAL;
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retry:
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free_blocks = atomic_read(&sdp->sd_log_blks_free);
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if (unlikely(free_blocks <= wanted)) {
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do {
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prepare_to_wait_exclusive(&sdp->sd_log_waitq, &wait,
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TASK_UNINTERRUPTIBLE);
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wake_up(&sdp->sd_logd_waitq);
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did_wait = 1;
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if (atomic_read(&sdp->sd_log_blks_free) <= wanted)
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io_schedule();
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free_blocks = atomic_read(&sdp->sd_log_blks_free);
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} while(free_blocks <= wanted);
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finish_wait(&sdp->sd_log_waitq, &wait);
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}
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if (atomic_cmpxchg(&sdp->sd_log_blks_free, free_blocks,
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free_blocks - blks) != free_blocks)
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goto retry;
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trace_gfs2_log_blocks(sdp, -blks);
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/*
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* If we waited, then so might others, wake them up _after_ we get
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* our share of the log.
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*/
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if (unlikely(did_wait))
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wake_up(&sdp->sd_log_waitq);
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down_read(&sdp->sd_log_flush_lock);
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return 0;
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}
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static u64 log_bmap(struct gfs2_sbd *sdp, unsigned int lbn)
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{
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struct gfs2_journal_extent *je;
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list_for_each_entry(je, &sdp->sd_jdesc->extent_list, extent_list) {
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if (lbn >= je->lblock && lbn < je->lblock + je->blocks)
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return je->dblock + lbn - je->lblock;
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}
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return -1;
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}
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/**
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* log_distance - Compute distance between two journal blocks
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* @sdp: The GFS2 superblock
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* @newer: The most recent journal block of the pair
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* @older: The older journal block of the pair
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*
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* Compute the distance (in the journal direction) between two
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* blocks in the journal
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*
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* Returns: the distance in blocks
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*/
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static inline unsigned int log_distance(struct gfs2_sbd *sdp, unsigned int newer,
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unsigned int older)
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{
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int dist;
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dist = newer - older;
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if (dist < 0)
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dist += sdp->sd_jdesc->jd_blocks;
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return dist;
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}
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/**
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* calc_reserved - Calculate the number of blocks to reserve when
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* refunding a transaction's unused buffers.
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* @sdp: The GFS2 superblock
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*
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* This is complex. We need to reserve room for all our currently used
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* metadata buffers (e.g. normal file I/O rewriting file time stamps) and
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* all our journaled data buffers for journaled files (e.g. files in the
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* meta_fs like rindex, or files for which chattr +j was done.)
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* If we don't reserve enough space, gfs2_log_refund and gfs2_log_flush
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* will count it as free space (sd_log_blks_free) and corruption will follow.
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*
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* We can have metadata bufs and jdata bufs in the same journal. So each
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* type gets its own log header, for which we need to reserve a block.
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* In fact, each type has the potential for needing more than one header
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* in cases where we have more buffers than will fit on a journal page.
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* Metadata journal entries take up half the space of journaled buffer entries.
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* Thus, metadata entries have buf_limit (502) and journaled buffers have
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* databuf_limit (251) before they cause a wrap around.
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*
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* Also, we need to reserve blocks for revoke journal entries and one for an
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* overall header for the lot.
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*
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* Returns: the number of blocks reserved
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*/
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static unsigned int calc_reserved(struct gfs2_sbd *sdp)
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{
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unsigned int reserved = 0;
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unsigned int mbuf_limit, metabufhdrs_needed;
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unsigned int dbuf_limit, databufhdrs_needed;
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unsigned int revokes = 0;
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mbuf_limit = buf_limit(sdp);
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metabufhdrs_needed = (sdp->sd_log_commited_buf +
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(mbuf_limit - 1)) / mbuf_limit;
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dbuf_limit = databuf_limit(sdp);
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databufhdrs_needed = (sdp->sd_log_commited_databuf +
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(dbuf_limit - 1)) / dbuf_limit;
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if (sdp->sd_log_commited_revoke > 0)
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revokes = gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke,
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sizeof(u64));
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reserved = sdp->sd_log_commited_buf + metabufhdrs_needed +
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sdp->sd_log_commited_databuf + databufhdrs_needed +
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revokes;
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/* One for the overall header */
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if (reserved)
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reserved++;
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return reserved;
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}
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static unsigned int current_tail(struct gfs2_sbd *sdp)
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{
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struct gfs2_ail *ai;
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unsigned int tail;
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spin_lock(&sdp->sd_ail_lock);
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if (list_empty(&sdp->sd_ail1_list)) {
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tail = sdp->sd_log_head;
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} else {
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ai = list_entry(sdp->sd_ail1_list.prev, struct gfs2_ail, ai_list);
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tail = ai->ai_first;
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}
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spin_unlock(&sdp->sd_ail_lock);
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return tail;
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}
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void gfs2_log_incr_head(struct gfs2_sbd *sdp)
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{
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if (sdp->sd_log_flush_head == sdp->sd_log_tail)
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BUG_ON(sdp->sd_log_flush_head != sdp->sd_log_head);
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if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) {
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sdp->sd_log_flush_head = 0;
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sdp->sd_log_flush_wrapped = 1;
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}
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}
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/**
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* gfs2_log_write_endio - End of I/O for a log buffer
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* @bh: The buffer head
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* @uptodate: I/O Status
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*
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*/
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static void gfs2_log_write_endio(struct buffer_head *bh, int uptodate)
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{
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struct gfs2_sbd *sdp = bh->b_private;
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bh->b_private = NULL;
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end_buffer_write_sync(bh, uptodate);
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if (atomic_dec_and_test(&sdp->sd_log_in_flight))
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wake_up(&sdp->sd_log_flush_wait);
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}
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/**
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* gfs2_log_get_buf - Get and initialize a buffer to use for log control data
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* @sdp: The GFS2 superblock
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*
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* Returns: the buffer_head
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*/
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struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp)
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{
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u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
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struct buffer_head *bh;
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bh = sb_getblk(sdp->sd_vfs, blkno);
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lock_buffer(bh);
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memset(bh->b_data, 0, bh->b_size);
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set_buffer_uptodate(bh);
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clear_buffer_dirty(bh);
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gfs2_log_incr_head(sdp);
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atomic_inc(&sdp->sd_log_in_flight);
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bh->b_private = sdp;
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bh->b_end_io = gfs2_log_write_endio;
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return bh;
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}
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/**
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* gfs2_fake_write_endio -
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* @bh: The buffer head
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* @uptodate: The I/O Status
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*
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*/
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static void gfs2_fake_write_endio(struct buffer_head *bh, int uptodate)
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{
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|
struct buffer_head *real_bh = bh->b_private;
|
|
struct gfs2_bufdata *bd = real_bh->b_private;
|
|
struct gfs2_sbd *sdp = bd->bd_gl->gl_sbd;
|
|
|
|
end_buffer_write_sync(bh, uptodate);
|
|
free_buffer_head(bh);
|
|
unlock_buffer(real_bh);
|
|
brelse(real_bh);
|
|
if (atomic_dec_and_test(&sdp->sd_log_in_flight))
|
|
wake_up(&sdp->sd_log_flush_wait);
|
|
}
|
|
|
|
/**
|
|
* gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log
|
|
* @sdp: the filesystem
|
|
* @data: the data the buffer_head should point to
|
|
*
|
|
* Returns: the log buffer descriptor
|
|
*/
|
|
|
|
struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp,
|
|
struct buffer_head *real)
|
|
{
|
|
u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
|
|
struct buffer_head *bh;
|
|
|
|
bh = alloc_buffer_head(GFP_NOFS | __GFP_NOFAIL);
|
|
atomic_set(&bh->b_count, 1);
|
|
bh->b_state = (1 << BH_Mapped) | (1 << BH_Uptodate) | (1 << BH_Lock);
|
|
set_bh_page(bh, real->b_page, bh_offset(real));
|
|
bh->b_blocknr = blkno;
|
|
bh->b_size = sdp->sd_sb.sb_bsize;
|
|
bh->b_bdev = sdp->sd_vfs->s_bdev;
|
|
bh->b_private = real;
|
|
bh->b_end_io = gfs2_fake_write_endio;
|
|
|
|
gfs2_log_incr_head(sdp);
|
|
atomic_inc(&sdp->sd_log_in_flight);
|
|
|
|
return bh;
|
|
}
|
|
|
|
static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail)
|
|
{
|
|
unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail);
|
|
|
|
ail2_empty(sdp, new_tail);
|
|
|
|
atomic_add(dist, &sdp->sd_log_blks_free);
|
|
trace_gfs2_log_blocks(sdp, dist);
|
|
gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
|
|
sdp->sd_jdesc->jd_blocks);
|
|
|
|
sdp->sd_log_tail = new_tail;
|
|
}
|
|
|
|
/**
|
|
* log_write_header - Get and initialize a journal header buffer
|
|
* @sdp: The GFS2 superblock
|
|
*
|
|
* Returns: the initialized log buffer descriptor
|
|
*/
|
|
|
|
static void log_write_header(struct gfs2_sbd *sdp, u32 flags, int pull)
|
|
{
|
|
u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
|
|
struct buffer_head *bh;
|
|
struct gfs2_log_header *lh;
|
|
unsigned int tail;
|
|
u32 hash;
|
|
|
|
bh = sb_getblk(sdp->sd_vfs, blkno);
|
|
lock_buffer(bh);
|
|
memset(bh->b_data, 0, bh->b_size);
|
|
set_buffer_uptodate(bh);
|
|
clear_buffer_dirty(bh);
|
|
|
|
gfs2_ail1_empty(sdp, 0);
|
|
tail = current_tail(sdp);
|
|
|
|
lh = (struct gfs2_log_header *)bh->b_data;
|
|
memset(lh, 0, sizeof(struct gfs2_log_header));
|
|
lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
|
|
lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH);
|
|
lh->lh_header.__pad0 = cpu_to_be64(0);
|
|
lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH);
|
|
lh->lh_header.mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
|
|
lh->lh_sequence = cpu_to_be64(sdp->sd_log_sequence++);
|
|
lh->lh_flags = cpu_to_be32(flags);
|
|
lh->lh_tail = cpu_to_be32(tail);
|
|
lh->lh_blkno = cpu_to_be32(sdp->sd_log_flush_head);
|
|
hash = gfs2_disk_hash(bh->b_data, sizeof(struct gfs2_log_header));
|
|
lh->lh_hash = cpu_to_be32(hash);
|
|
|
|
bh->b_end_io = end_buffer_write_sync;
|
|
get_bh(bh);
|
|
if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
|
|
submit_bh(WRITE_SYNC | REQ_META, bh);
|
|
else
|
|
submit_bh(WRITE_FLUSH_FUA | REQ_META, bh);
|
|
wait_on_buffer(bh);
|
|
|
|
if (!buffer_uptodate(bh))
|
|
gfs2_io_error_bh(sdp, bh);
|
|
brelse(bh);
|
|
|
|
if (sdp->sd_log_tail != tail)
|
|
log_pull_tail(sdp, tail);
|
|
else
|
|
gfs2_assert_withdraw(sdp, !pull);
|
|
|
|
sdp->sd_log_idle = (tail == sdp->sd_log_flush_head);
|
|
gfs2_log_incr_head(sdp);
|
|
}
|
|
|
|
static void log_flush_commit(struct gfs2_sbd *sdp)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
|
|
if (atomic_read(&sdp->sd_log_in_flight)) {
|
|
do {
|
|
prepare_to_wait(&sdp->sd_log_flush_wait, &wait,
|
|
TASK_UNINTERRUPTIBLE);
|
|
if (atomic_read(&sdp->sd_log_in_flight))
|
|
io_schedule();
|
|
} while(atomic_read(&sdp->sd_log_in_flight));
|
|
finish_wait(&sdp->sd_log_flush_wait, &wait);
|
|
}
|
|
|
|
log_write_header(sdp, 0, 0);
|
|
}
|
|
|
|
static void gfs2_ordered_write(struct gfs2_sbd *sdp)
|
|
{
|
|
struct gfs2_bufdata *bd;
|
|
struct buffer_head *bh;
|
|
LIST_HEAD(written);
|
|
|
|
gfs2_log_lock(sdp);
|
|
while (!list_empty(&sdp->sd_log_le_ordered)) {
|
|
bd = list_entry(sdp->sd_log_le_ordered.next, struct gfs2_bufdata, bd_le.le_list);
|
|
list_move(&bd->bd_le.le_list, &written);
|
|
bh = bd->bd_bh;
|
|
if (!buffer_dirty(bh))
|
|
continue;
|
|
get_bh(bh);
|
|
gfs2_log_unlock(sdp);
|
|
lock_buffer(bh);
|
|
if (buffer_mapped(bh) && test_clear_buffer_dirty(bh)) {
|
|
bh->b_end_io = end_buffer_write_sync;
|
|
submit_bh(WRITE_SYNC, bh);
|
|
} else {
|
|
unlock_buffer(bh);
|
|
brelse(bh);
|
|
}
|
|
gfs2_log_lock(sdp);
|
|
}
|
|
list_splice(&written, &sdp->sd_log_le_ordered);
|
|
gfs2_log_unlock(sdp);
|
|
}
|
|
|
|
static void gfs2_ordered_wait(struct gfs2_sbd *sdp)
|
|
{
|
|
struct gfs2_bufdata *bd;
|
|
struct buffer_head *bh;
|
|
|
|
gfs2_log_lock(sdp);
|
|
while (!list_empty(&sdp->sd_log_le_ordered)) {
|
|
bd = list_entry(sdp->sd_log_le_ordered.prev, struct gfs2_bufdata, bd_le.le_list);
|
|
bh = bd->bd_bh;
|
|
if (buffer_locked(bh)) {
|
|
get_bh(bh);
|
|
gfs2_log_unlock(sdp);
|
|
wait_on_buffer(bh);
|
|
brelse(bh);
|
|
gfs2_log_lock(sdp);
|
|
continue;
|
|
}
|
|
list_del_init(&bd->bd_le.le_list);
|
|
}
|
|
gfs2_log_unlock(sdp);
|
|
}
|
|
|
|
/**
|
|
* gfs2_log_flush - flush incore transaction(s)
|
|
* @sdp: the filesystem
|
|
* @gl: The glock structure to flush. If NULL, flush the whole incore log
|
|
*
|
|
*/
|
|
|
|
void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl)
|
|
{
|
|
struct gfs2_ail *ai;
|
|
|
|
down_write(&sdp->sd_log_flush_lock);
|
|
|
|
/* Log might have been flushed while we waited for the flush lock */
|
|
if (gl && !test_bit(GLF_LFLUSH, &gl->gl_flags)) {
|
|
up_write(&sdp->sd_log_flush_lock);
|
|
return;
|
|
}
|
|
trace_gfs2_log_flush(sdp, 1);
|
|
|
|
ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS | __GFP_NOFAIL);
|
|
INIT_LIST_HEAD(&ai->ai_ail1_list);
|
|
INIT_LIST_HEAD(&ai->ai_ail2_list);
|
|
|
|
if (sdp->sd_log_num_buf != sdp->sd_log_commited_buf) {
|
|
printk(KERN_INFO "GFS2: log buf %u %u\n", sdp->sd_log_num_buf,
|
|
sdp->sd_log_commited_buf);
|
|
gfs2_assert_withdraw(sdp, 0);
|
|
}
|
|
if (sdp->sd_log_num_databuf != sdp->sd_log_commited_databuf) {
|
|
printk(KERN_INFO "GFS2: log databuf %u %u\n",
|
|
sdp->sd_log_num_databuf, sdp->sd_log_commited_databuf);
|
|
gfs2_assert_withdraw(sdp, 0);
|
|
}
|
|
gfs2_assert_withdraw(sdp,
|
|
sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke);
|
|
|
|
sdp->sd_log_flush_head = sdp->sd_log_head;
|
|
sdp->sd_log_flush_wrapped = 0;
|
|
ai->ai_first = sdp->sd_log_flush_head;
|
|
|
|
gfs2_ordered_write(sdp);
|
|
lops_before_commit(sdp);
|
|
gfs2_ordered_wait(sdp);
|
|
|
|
if (sdp->sd_log_head != sdp->sd_log_flush_head)
|
|
log_flush_commit(sdp);
|
|
else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle){
|
|
gfs2_log_lock(sdp);
|
|
atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */
|
|
trace_gfs2_log_blocks(sdp, -1);
|
|
gfs2_log_unlock(sdp);
|
|
log_write_header(sdp, 0, PULL);
|
|
}
|
|
lops_after_commit(sdp, ai);
|
|
|
|
gfs2_log_lock(sdp);
|
|
sdp->sd_log_head = sdp->sd_log_flush_head;
|
|
sdp->sd_log_blks_reserved = 0;
|
|
sdp->sd_log_commited_buf = 0;
|
|
sdp->sd_log_commited_databuf = 0;
|
|
sdp->sd_log_commited_revoke = 0;
|
|
|
|
spin_lock(&sdp->sd_ail_lock);
|
|
if (!list_empty(&ai->ai_ail1_list)) {
|
|
list_add(&ai->ai_list, &sdp->sd_ail1_list);
|
|
ai = NULL;
|
|
}
|
|
spin_unlock(&sdp->sd_ail_lock);
|
|
gfs2_log_unlock(sdp);
|
|
trace_gfs2_log_flush(sdp, 0);
|
|
up_write(&sdp->sd_log_flush_lock);
|
|
|
|
kfree(ai);
|
|
}
|
|
|
|
static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
|
|
{
|
|
unsigned int reserved;
|
|
unsigned int unused;
|
|
|
|
gfs2_log_lock(sdp);
|
|
|
|
sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm;
|
|
sdp->sd_log_commited_databuf += tr->tr_num_databuf_new -
|
|
tr->tr_num_databuf_rm;
|
|
gfs2_assert_withdraw(sdp, (((int)sdp->sd_log_commited_buf) >= 0) ||
|
|
(((int)sdp->sd_log_commited_databuf) >= 0));
|
|
sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm;
|
|
reserved = calc_reserved(sdp);
|
|
gfs2_assert_withdraw(sdp, sdp->sd_log_blks_reserved + tr->tr_reserved >= reserved);
|
|
unused = sdp->sd_log_blks_reserved - reserved + tr->tr_reserved;
|
|
atomic_add(unused, &sdp->sd_log_blks_free);
|
|
trace_gfs2_log_blocks(sdp, unused);
|
|
gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
|
|
sdp->sd_jdesc->jd_blocks);
|
|
sdp->sd_log_blks_reserved = reserved;
|
|
|
|
gfs2_log_unlock(sdp);
|
|
}
|
|
|
|
static void buf_lo_incore_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
|
|
{
|
|
struct list_head *head = &tr->tr_list_buf;
|
|
struct gfs2_bufdata *bd;
|
|
|
|
gfs2_log_lock(sdp);
|
|
while (!list_empty(head)) {
|
|
bd = list_entry(head->next, struct gfs2_bufdata, bd_list_tr);
|
|
list_del_init(&bd->bd_list_tr);
|
|
tr->tr_num_buf--;
|
|
}
|
|
gfs2_log_unlock(sdp);
|
|
gfs2_assert_warn(sdp, !tr->tr_num_buf);
|
|
}
|
|
|
|
/**
|
|
* gfs2_log_commit - Commit a transaction to the log
|
|
* @sdp: the filesystem
|
|
* @tr: the transaction
|
|
*
|
|
* We wake up gfs2_logd if the number of pinned blocks exceed thresh1
|
|
* or the total number of used blocks (pinned blocks plus AIL blocks)
|
|
* is greater than thresh2.
|
|
*
|
|
* At mount time thresh1 is 1/3rd of journal size, thresh2 is 2/3rd of
|
|
* journal size.
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
|
|
{
|
|
log_refund(sdp, tr);
|
|
buf_lo_incore_commit(sdp, tr);
|
|
|
|
up_read(&sdp->sd_log_flush_lock);
|
|
|
|
if (atomic_read(&sdp->sd_log_pinned) > atomic_read(&sdp->sd_log_thresh1) ||
|
|
((sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free)) >
|
|
atomic_read(&sdp->sd_log_thresh2)))
|
|
wake_up(&sdp->sd_logd_waitq);
|
|
}
|
|
|
|
/**
|
|
* gfs2_log_shutdown - write a shutdown header into a journal
|
|
* @sdp: the filesystem
|
|
*
|
|
*/
|
|
|
|
void gfs2_log_shutdown(struct gfs2_sbd *sdp)
|
|
{
|
|
down_write(&sdp->sd_log_flush_lock);
|
|
|
|
gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved);
|
|
gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf);
|
|
gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
|
|
gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg);
|
|
gfs2_assert_withdraw(sdp, !sdp->sd_log_num_databuf);
|
|
gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list));
|
|
|
|
sdp->sd_log_flush_head = sdp->sd_log_head;
|
|
sdp->sd_log_flush_wrapped = 0;
|
|
|
|
log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT,
|
|
(sdp->sd_log_tail == current_tail(sdp)) ? 0 : PULL);
|
|
|
|
gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
|
|
gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail);
|
|
gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list));
|
|
|
|
sdp->sd_log_head = sdp->sd_log_flush_head;
|
|
sdp->sd_log_tail = sdp->sd_log_head;
|
|
|
|
up_write(&sdp->sd_log_flush_lock);
|
|
}
|
|
|
|
|
|
/**
|
|
* gfs2_meta_syncfs - sync all the buffers in a filesystem
|
|
* @sdp: the filesystem
|
|
*
|
|
*/
|
|
|
|
void gfs2_meta_syncfs(struct gfs2_sbd *sdp)
|
|
{
|
|
gfs2_log_flush(sdp, NULL);
|
|
for (;;) {
|
|
gfs2_ail1_start(sdp);
|
|
if (gfs2_ail1_empty(sdp, DIO_ALL))
|
|
break;
|
|
msleep(10);
|
|
}
|
|
}
|
|
|
|
static inline int gfs2_jrnl_flush_reqd(struct gfs2_sbd *sdp)
|
|
{
|
|
return (atomic_read(&sdp->sd_log_pinned) >= atomic_read(&sdp->sd_log_thresh1));
|
|
}
|
|
|
|
static inline int gfs2_ail_flush_reqd(struct gfs2_sbd *sdp)
|
|
{
|
|
unsigned int used_blocks = sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free);
|
|
return used_blocks >= atomic_read(&sdp->sd_log_thresh2);
|
|
}
|
|
|
|
/**
|
|
* gfs2_logd - Update log tail as Active Items get flushed to in-place blocks
|
|
* @sdp: Pointer to GFS2 superblock
|
|
*
|
|
* Also, periodically check to make sure that we're using the most recent
|
|
* journal index.
|
|
*/
|
|
|
|
int gfs2_logd(void *data)
|
|
{
|
|
struct gfs2_sbd *sdp = data;
|
|
unsigned long t = 1;
|
|
DEFINE_WAIT(wait);
|
|
unsigned preflush;
|
|
|
|
while (!kthread_should_stop()) {
|
|
|
|
preflush = atomic_read(&sdp->sd_log_pinned);
|
|
if (gfs2_jrnl_flush_reqd(sdp) || t == 0) {
|
|
gfs2_ail1_empty(sdp, DIO_ALL);
|
|
gfs2_log_flush(sdp, NULL);
|
|
gfs2_ail1_empty(sdp, DIO_ALL);
|
|
}
|
|
|
|
if (gfs2_ail_flush_reqd(sdp)) {
|
|
gfs2_ail1_start(sdp);
|
|
io_schedule();
|
|
gfs2_ail1_empty(sdp, 0);
|
|
gfs2_log_flush(sdp, NULL);
|
|
gfs2_ail1_empty(sdp, DIO_ALL);
|
|
}
|
|
|
|
wake_up(&sdp->sd_log_waitq);
|
|
t = gfs2_tune_get(sdp, gt_logd_secs) * HZ;
|
|
if (freezing(current))
|
|
refrigerator();
|
|
|
|
do {
|
|
prepare_to_wait(&sdp->sd_logd_waitq, &wait,
|
|
TASK_INTERRUPTIBLE);
|
|
if (!gfs2_ail_flush_reqd(sdp) &&
|
|
!gfs2_jrnl_flush_reqd(sdp) &&
|
|
!kthread_should_stop())
|
|
t = schedule_timeout(t);
|
|
} while(t && !gfs2_ail_flush_reqd(sdp) &&
|
|
!gfs2_jrnl_flush_reqd(sdp) &&
|
|
!kthread_should_stop());
|
|
finish_wait(&sdp->sd_logd_waitq, &wait);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|