fs/gfs2/daemon.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2005 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License v.2.
   8  */
   9
  10 #include <linux/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/kthread.h>
  16 #include <linux/delay.h>
  17 #include <linux/gfs2_ondisk.h>
  18 #include <asm/semaphore.h>
  19
  20 #include "gfs2.h"
  21 #include "lm_interface.h"
  22 #include "incore.h"
  23 #include "daemon.h"
  24 #include "glock.h"
  25 #include "log.h"
  26 #include "quota.h"
  27 #include "recovery.h"
  28 #include "super.h"
  29 #include "unlinked.h"
  30 #include "util.h"
  31
  32 /* This uses schedule_timeout() instead of msleep() because it's good for
  33    the daemons to wake up more often than the timeout when unmounting so
  34    the user's unmount doesn't sit there forever.
  35
  36    The kthread functions used to start these daemons block and flush signals. */
  37
  38 /**
  39  * gfs2_scand - Look for cached glocks and inodes to toss from memory
  40  * @sdp: Pointer to GFS2 superblock
  41  *
  42  * One of these daemons runs, finding candidates to add to sd_reclaim_list.
  43  * See gfs2_glockd()
  44  */
  45
  46 int gfs2_scand(void *data)
  47 {
  48         struct gfs2_sbd *sdp = data;
  49         unsigned long t;
  50
  51         while (!kthread_should_stop()) {
  52                 gfs2_scand_internal(sdp);
  53                 t = gfs2_tune_get(sdp, gt_scand_secs) * HZ;
  54                 schedule_timeout_interruptible(t);
  55         }
  56
  57         return 0;
  58 }
  59
  60 /**
  61  * gfs2_glockd - Reclaim unused glock structures
  62  * @sdp: Pointer to GFS2 superblock
  63  *
  64  * One or more of these daemons run, reclaiming glocks on sd_reclaim_list.
  65  * Number of daemons can be set by user, with num_glockd mount option.
  66  */
  67
  68 int gfs2_glockd(void *data)
  69 {
  70         struct gfs2_sbd *sdp = data;
  71
  72         while (!kthread_should_stop()) {
  73                 while (atomic_read(&sdp->sd_reclaim_count))
  74                         gfs2_reclaim_glock(sdp);
  75
  76                 wait_event_interruptible(sdp->sd_reclaim_wq,
  77                                          (atomic_read(&sdp->sd_reclaim_count) ||
  78                                          kthread_should_stop()));
  79         }
  80
  81         return 0;
  82 }
  83
  84 /**
  85  * gfs2_recoverd - Recover dead machine's journals
  86  * @sdp: Pointer to GFS2 superblock
  87  *
  88  */
  89
  90 int gfs2_recoverd(void *data)
  91 {
  92         struct gfs2_sbd *sdp = data;
  93         unsigned long t;
  94
  95         while (!kthread_should_stop()) {
  96                 gfs2_check_journals(sdp);
  97                 t = gfs2_tune_get(sdp,  gt_recoverd_secs) * HZ;
  98                 schedule_timeout_interruptible(t);
  99         }
 100
 101         return 0;
 102 }
 103
 104 /**
 105  * gfs2_logd - Update log tail as Active Items get flushed to in-place blocks
 106  * @sdp: Pointer to GFS2 superblock
 107  *
 108  * Also, periodically check to make sure that we're using the most recent
 109  * journal index.
 110  */
 111
 112 int gfs2_logd(void *data)
 113 {
 114         struct gfs2_sbd *sdp = data;
 115         struct gfs2_holder ji_gh;
 116         unsigned long t;
 117
 118         while (!kthread_should_stop()) {
 119                 /* Advance the log tail */
 120
 121                 t = sdp->sd_log_flush_time +
 122                     gfs2_tune_get(sdp, gt_log_flush_secs) * HZ;
 123
 124                 gfs2_ail1_empty(sdp, DIO_ALL);
 125
 126                 if (time_after_eq(jiffies, t)) {
 127                         gfs2_log_flush(sdp, NULL);
 128                         sdp->sd_log_flush_time = jiffies;
 129                 }
 130
 131                 /* Check for latest journal index */
 132
 133                 t = sdp->sd_jindex_refresh_time +
 134                     gfs2_tune_get(sdp, gt_jindex_refresh_secs) * HZ;
 135
 136                 if (time_after_eq(jiffies, t)) {
 137                         if (!gfs2_jindex_hold(sdp, &ji_gh))
 138                                 gfs2_glock_dq_uninit(&ji_gh);
 139                         sdp->sd_jindex_refresh_time = jiffies;
 140                 }
 141
 142                 t = gfs2_tune_get(sdp, gt_logd_secs) * HZ;
 143                 schedule_timeout_interruptible(t);
 144         }
 145
 146         return 0;
 147 }
 148
 149 /**
 150  * gfs2_quotad - Write cached quota changes into the quota file
 151  * @sdp: Pointer to GFS2 superblock
 152  *
 153  */
 154
 155 int gfs2_quotad(void *data)
 156 {
 157         struct gfs2_sbd *sdp = data;
 158         unsigned long t;
 159         int error;
 160
 161         while (!kthread_should_stop()) {
 162                 /* Update the master statfs file */
 163
 164                 t = sdp->sd_statfs_sync_time +
 165                     gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
 166
 167                 if (time_after_eq(jiffies, t)) {
 168                         error = gfs2_statfs_sync(sdp);
 169                         if (error &&
 170                             error != -EROFS &&
 171                             !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
 172                                 fs_err(sdp, "quotad: (1) error=%d\n", error);
 173                         sdp->sd_statfs_sync_time = jiffies;
 174                 }
 175
 176                 /* Update quota file */
 177
 178                 t = sdp->sd_quota_sync_time +
 179                     gfs2_tune_get(sdp, gt_quota_quantum) * HZ;
 180
 181                 if (time_after_eq(jiffies, t)) {
 182                         error = gfs2_quota_sync(sdp);
 183                         if (error &&
 184                             error != -EROFS &&
 185                             !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
 186                                 fs_err(sdp, "quotad: (2) error=%d\n", error);
 187                         sdp->sd_quota_sync_time = jiffies;
 188                 }
 189
 190                 gfs2_quota_scan(sdp);
 191
 192                 t = gfs2_tune_get(sdp, gt_quotad_secs) * HZ;
 193                 schedule_timeout_interruptible(t);
 194         }
 195
 196         return 0;
 197 }
 198
 199 /**
 200  * gfs2_inoded - Deallocate unlinked inodes
 201  * @sdp: Pointer to GFS2 superblock
 202  *
 203  */
 204
 205 int gfs2_inoded(void *data)
 206 {
 207         struct gfs2_sbd *sdp = data;
 208         unsigned long t;
 209         int error;
 210
 211         while (!kthread_should_stop()) {
 212                 error = gfs2_unlinked_dealloc(sdp);
 213                 if (error &&
 214                     error != -EROFS &&
 215                     !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
 216                         fs_err(sdp, "inoded: error = %d\n", error);
 217
 218                 t = gfs2_tune_get(sdp, gt_inoded_secs) * HZ;
 219                 schedule_timeout_interruptible(t);
 220         }
 221
 222         return 0;
 223 }
 224