| /* |
| * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
| * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
| * |
| * This copyrighted material is made available to anyone wishing to use, |
| * modify, copy, or redistribute it subject to the terms and conditions |
| * of the GNU General Public License v.2. |
| */ |
| |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/completion.h> |
| #include <linux/buffer_head.h> |
| #include <linux/kthread.h> |
| #include <linux/delay.h> |
| #include <linux/gfs2_ondisk.h> |
| |
| #include "gfs2.h" |
| #include "lm_interface.h" |
| #include "incore.h" |
| #include "daemon.h" |
| #include "glock.h" |
| #include "log.h" |
| #include "quota.h" |
| #include "recovery.h" |
| #include "super.h" |
| #include "unlinked.h" |
| #include "util.h" |
| |
| /* This uses schedule_timeout() instead of msleep() because it's good for |
| the daemons to wake up more often than the timeout when unmounting so |
| the user's unmount doesn't sit there forever. |
| |
| The kthread functions used to start these daemons block and flush signals. */ |
| |
| /** |
| * gfs2_scand - Look for cached glocks and inodes to toss from memory |
| * @sdp: Pointer to GFS2 superblock |
| * |
| * One of these daemons runs, finding candidates to add to sd_reclaim_list. |
| * See gfs2_glockd() |
| */ |
| |
| int gfs2_scand(void *data) |
| { |
| struct gfs2_sbd *sdp = data; |
| unsigned long t; |
| |
| while (!kthread_should_stop()) { |
| gfs2_scand_internal(sdp); |
| t = gfs2_tune_get(sdp, gt_scand_secs) * HZ; |
| schedule_timeout_interruptible(t); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * gfs2_glockd - Reclaim unused glock structures |
| * @sdp: Pointer to GFS2 superblock |
| * |
| * One or more of these daemons run, reclaiming glocks on sd_reclaim_list. |
| * Number of daemons can be set by user, with num_glockd mount option. |
| */ |
| |
| int gfs2_glockd(void *data) |
| { |
| struct gfs2_sbd *sdp = data; |
| |
| while (!kthread_should_stop()) { |
| while (atomic_read(&sdp->sd_reclaim_count)) |
| gfs2_reclaim_glock(sdp); |
| |
| wait_event_interruptible(sdp->sd_reclaim_wq, |
| (atomic_read(&sdp->sd_reclaim_count) || |
| kthread_should_stop())); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * gfs2_recoverd - Recover dead machine's journals |
| * @sdp: Pointer to GFS2 superblock |
| * |
| */ |
| |
| int gfs2_recoverd(void *data) |
| { |
| struct gfs2_sbd *sdp = data; |
| unsigned long t; |
| |
| while (!kthread_should_stop()) { |
| gfs2_check_journals(sdp); |
| t = gfs2_tune_get(sdp, gt_recoverd_secs) * HZ; |
| schedule_timeout_interruptible(t); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * 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; |
| struct gfs2_holder ji_gh; |
| unsigned long t; |
| |
| while (!kthread_should_stop()) { |
| /* Advance the log tail */ |
| |
| t = sdp->sd_log_flush_time + |
| gfs2_tune_get(sdp, gt_log_flush_secs) * HZ; |
| |
| gfs2_ail1_empty(sdp, DIO_ALL); |
| |
| if (time_after_eq(jiffies, t)) { |
| gfs2_log_flush(sdp, NULL); |
| sdp->sd_log_flush_time = jiffies; |
| } |
| |
| /* Check for latest journal index */ |
| |
| t = sdp->sd_jindex_refresh_time + |
| gfs2_tune_get(sdp, gt_jindex_refresh_secs) * HZ; |
| |
| if (time_after_eq(jiffies, t)) { |
| if (!gfs2_jindex_hold(sdp, &ji_gh)) |
| gfs2_glock_dq_uninit(&ji_gh); |
| sdp->sd_jindex_refresh_time = jiffies; |
| } |
| |
| t = gfs2_tune_get(sdp, gt_logd_secs) * HZ; |
| schedule_timeout_interruptible(t); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * gfs2_quotad - Write cached quota changes into the quota file |
| * @sdp: Pointer to GFS2 superblock |
| * |
| */ |
| |
| int gfs2_quotad(void *data) |
| { |
| struct gfs2_sbd *sdp = data; |
| unsigned long t; |
| int error; |
| |
| while (!kthread_should_stop()) { |
| /* Update the master statfs file */ |
| |
| t = sdp->sd_statfs_sync_time + |
| gfs2_tune_get(sdp, gt_statfs_quantum) * HZ; |
| |
| if (time_after_eq(jiffies, t)) { |
| error = gfs2_statfs_sync(sdp); |
| if (error && |
| error != -EROFS && |
| !test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) |
| fs_err(sdp, "quotad: (1) error=%d\n", error); |
| sdp->sd_statfs_sync_time = jiffies; |
| } |
| |
| /* Update quota file */ |
| |
| t = sdp->sd_quota_sync_time + |
| gfs2_tune_get(sdp, gt_quota_quantum) * HZ; |
| |
| if (time_after_eq(jiffies, t)) { |
| error = gfs2_quota_sync(sdp); |
| if (error && |
| error != -EROFS && |
| !test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) |
| fs_err(sdp, "quotad: (2) error=%d\n", error); |
| sdp->sd_quota_sync_time = jiffies; |
| } |
| |
| gfs2_quota_scan(sdp); |
| |
| t = gfs2_tune_get(sdp, gt_quotad_secs) * HZ; |
| schedule_timeout_interruptible(t); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * gfs2_inoded - Deallocate unlinked inodes |
| * @sdp: Pointer to GFS2 superblock |
| * |
| */ |
| |
| int gfs2_inoded(void *data) |
| { |
| struct gfs2_sbd *sdp = data; |
| unsigned long t; |
| int error; |
| |
| while (!kthread_should_stop()) { |
| error = gfs2_unlinked_dealloc(sdp); |
| if (error && |
| error != -EROFS && |
| !test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) |
| fs_err(sdp, "inoded: error = %d\n", error); |
| |
| t = gfs2_tune_get(sdp, gt_inoded_secs) * HZ; |
| schedule_timeout_interruptible(t); |
| } |
| |
| return 0; |
| } |
| |