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186 lines
4.3 KiB
186 lines
4.3 KiB
/*
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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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#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/kthread.h>
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#include <linux/delay.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/lm_interface.h>
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#include <linux/freezer.h>
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#include "gfs2.h"
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#include "incore.h"
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#include "daemon.h"
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#include "glock.h"
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#include "log.h"
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#include "quota.h"
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#include "recovery.h"
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#include "super.h"
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#include "util.h"
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/* This uses schedule_timeout() instead of msleep() because it's good for
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the daemons to wake up more often than the timeout when unmounting so
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the user's unmount doesn't sit there forever.
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The kthread functions used to start these daemons block and flush signals. */
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/**
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* gfs2_glockd - Reclaim unused glock structures
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* @sdp: Pointer to GFS2 superblock
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*
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* One or more of these daemons run, reclaiming glocks on sd_reclaim_list.
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* Number of daemons can be set by user, with num_glockd mount option.
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*/
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int gfs2_glockd(void *data)
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{
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struct gfs2_sbd *sdp = data;
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while (!kthread_should_stop()) {
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while (atomic_read(&sdp->sd_reclaim_count))
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gfs2_reclaim_glock(sdp);
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wait_event_interruptible(sdp->sd_reclaim_wq,
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(atomic_read(&sdp->sd_reclaim_count) ||
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kthread_should_stop()));
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if (freezing(current))
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refrigerator();
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}
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return 0;
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}
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/**
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* gfs2_recoverd - Recover dead machine's journals
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* @sdp: Pointer to GFS2 superblock
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*
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*/
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int gfs2_recoverd(void *data)
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{
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struct gfs2_sbd *sdp = data;
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unsigned long t;
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while (!kthread_should_stop()) {
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gfs2_check_journals(sdp);
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t = gfs2_tune_get(sdp, gt_recoverd_secs) * HZ;
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if (freezing(current))
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refrigerator();
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schedule_timeout_interruptible(t);
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}
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return 0;
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}
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/**
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* gfs2_logd - Update log tail as Active Items get flushed to in-place blocks
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* @sdp: Pointer to GFS2 superblock
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*
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* Also, periodically check to make sure that we're using the most recent
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* journal index.
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*/
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int gfs2_logd(void *data)
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{
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struct gfs2_sbd *sdp = data;
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struct gfs2_holder ji_gh;
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unsigned long t;
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int need_flush;
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while (!kthread_should_stop()) {
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/* Advance the log tail */
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t = sdp->sd_log_flush_time +
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gfs2_tune_get(sdp, gt_log_flush_secs) * HZ;
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gfs2_ail1_empty(sdp, DIO_ALL);
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gfs2_log_lock(sdp);
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need_flush = sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks);
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gfs2_log_unlock(sdp);
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if (need_flush || time_after_eq(jiffies, t)) {
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gfs2_log_flush(sdp, NULL);
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sdp->sd_log_flush_time = jiffies;
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}
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/* Check for latest journal index */
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t = sdp->sd_jindex_refresh_time +
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gfs2_tune_get(sdp, gt_jindex_refresh_secs) * HZ;
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if (time_after_eq(jiffies, t)) {
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if (!gfs2_jindex_hold(sdp, &ji_gh))
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gfs2_glock_dq_uninit(&ji_gh);
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sdp->sd_jindex_refresh_time = jiffies;
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}
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t = gfs2_tune_get(sdp, gt_logd_secs) * HZ;
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if (freezing(current))
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refrigerator();
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schedule_timeout_interruptible(t);
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}
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return 0;
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}
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/**
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* gfs2_quotad - Write cached quota changes into the quota file
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* @sdp: Pointer to GFS2 superblock
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*
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*/
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int gfs2_quotad(void *data)
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{
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struct gfs2_sbd *sdp = data;
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unsigned long t;
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int error;
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while (!kthread_should_stop()) {
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/* Update the master statfs file */
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t = sdp->sd_statfs_sync_time +
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gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
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if (time_after_eq(jiffies, t)) {
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error = gfs2_statfs_sync(sdp);
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if (error &&
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error != -EROFS &&
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!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
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fs_err(sdp, "quotad: (1) error=%d\n", error);
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sdp->sd_statfs_sync_time = jiffies;
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}
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/* Update quota file */
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t = sdp->sd_quota_sync_time +
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gfs2_tune_get(sdp, gt_quota_quantum) * HZ;
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if (time_after_eq(jiffies, t)) {
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error = gfs2_quota_sync(sdp);
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if (error &&
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error != -EROFS &&
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!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
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fs_err(sdp, "quotad: (2) error=%d\n", error);
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sdp->sd_quota_sync_time = jiffies;
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}
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gfs2_quota_scan(sdp);
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t = gfs2_tune_get(sdp, gt_quotad_secs) * HZ;
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if (freezing(current))
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refrigerator();
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schedule_timeout_interruptible(t);
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}
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return 0;
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}
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