David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
Steven Whitehouse | 3a8a9a1 | 2006-05-18 15:09:15 -0400 | [diff] [blame] | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 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> |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 17 | #include <linux/gfs2_ondisk.h> |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 18 | |
| 19 | #include "gfs2.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 20 | #include "lm_interface.h" |
| 21 | #include "incore.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 22 | #include "daemon.h" |
| 23 | #include "glock.h" |
| 24 | #include "log.h" |
| 25 | #include "quota.h" |
| 26 | #include "recovery.h" |
| 27 | #include "super.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 28 | #include "util.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 29 | |
| 30 | /* This uses schedule_timeout() instead of msleep() because it's good for |
| 31 | the daemons to wake up more often than the timeout when unmounting so |
| 32 | the user's unmount doesn't sit there forever. |
| 33 | |
| 34 | The kthread functions used to start these daemons block and flush signals. */ |
| 35 | |
| 36 | /** |
| 37 | * gfs2_scand - Look for cached glocks and inodes to toss from memory |
| 38 | * @sdp: Pointer to GFS2 superblock |
| 39 | * |
| 40 | * One of these daemons runs, finding candidates to add to sd_reclaim_list. |
| 41 | * See gfs2_glockd() |
| 42 | */ |
| 43 | |
| 44 | int gfs2_scand(void *data) |
| 45 | { |
Steven Whitehouse | b800a1c | 2006-04-24 13:13:56 -0400 | [diff] [blame] | 46 | struct gfs2_sbd *sdp = data; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 47 | unsigned long t; |
| 48 | |
| 49 | while (!kthread_should_stop()) { |
| 50 | gfs2_scand_internal(sdp); |
| 51 | t = gfs2_tune_get(sdp, gt_scand_secs) * HZ; |
| 52 | schedule_timeout_interruptible(t); |
| 53 | } |
| 54 | |
| 55 | return 0; |
| 56 | } |
| 57 | |
| 58 | /** |
| 59 | * gfs2_glockd - Reclaim unused glock structures |
| 60 | * @sdp: Pointer to GFS2 superblock |
| 61 | * |
| 62 | * One or more of these daemons run, reclaiming glocks on sd_reclaim_list. |
| 63 | * Number of daemons can be set by user, with num_glockd mount option. |
| 64 | */ |
| 65 | |
| 66 | int gfs2_glockd(void *data) |
| 67 | { |
Steven Whitehouse | b800a1c | 2006-04-24 13:13:56 -0400 | [diff] [blame] | 68 | struct gfs2_sbd *sdp = data; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 69 | |
| 70 | while (!kthread_should_stop()) { |
| 71 | while (atomic_read(&sdp->sd_reclaim_count)) |
| 72 | gfs2_reclaim_glock(sdp); |
| 73 | |
Steven Whitehouse | b800a1c | 2006-04-24 13:13:56 -0400 | [diff] [blame] | 74 | wait_event_interruptible(sdp->sd_reclaim_wq, |
| 75 | (atomic_read(&sdp->sd_reclaim_count) || |
| 76 | kthread_should_stop())); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 77 | } |
| 78 | |
| 79 | return 0; |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * gfs2_recoverd - Recover dead machine's journals |
| 84 | * @sdp: Pointer to GFS2 superblock |
| 85 | * |
| 86 | */ |
| 87 | |
| 88 | int gfs2_recoverd(void *data) |
| 89 | { |
Steven Whitehouse | b800a1c | 2006-04-24 13:13:56 -0400 | [diff] [blame] | 90 | struct gfs2_sbd *sdp = data; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 91 | unsigned long t; |
| 92 | |
| 93 | while (!kthread_should_stop()) { |
| 94 | gfs2_check_journals(sdp); |
| 95 | t = gfs2_tune_get(sdp, gt_recoverd_secs) * HZ; |
| 96 | schedule_timeout_interruptible(t); |
| 97 | } |
| 98 | |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | /** |
| 103 | * gfs2_logd - Update log tail as Active Items get flushed to in-place blocks |
| 104 | * @sdp: Pointer to GFS2 superblock |
| 105 | * |
| 106 | * Also, periodically check to make sure that we're using the most recent |
| 107 | * journal index. |
| 108 | */ |
| 109 | |
| 110 | int gfs2_logd(void *data) |
| 111 | { |
Steven Whitehouse | b800a1c | 2006-04-24 13:13:56 -0400 | [diff] [blame] | 112 | struct gfs2_sbd *sdp = data; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 113 | struct gfs2_holder ji_gh; |
| 114 | unsigned long t; |
| 115 | |
| 116 | while (!kthread_should_stop()) { |
| 117 | /* Advance the log tail */ |
| 118 | |
| 119 | t = sdp->sd_log_flush_time + |
| 120 | gfs2_tune_get(sdp, gt_log_flush_secs) * HZ; |
| 121 | |
| 122 | gfs2_ail1_empty(sdp, DIO_ALL); |
| 123 | |
| 124 | if (time_after_eq(jiffies, t)) { |
Steven Whitehouse | b09e593 | 2006-04-07 11:17:32 -0400 | [diff] [blame] | 125 | gfs2_log_flush(sdp, NULL); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 126 | sdp->sd_log_flush_time = jiffies; |
| 127 | } |
| 128 | |
| 129 | /* Check for latest journal index */ |
| 130 | |
| 131 | t = sdp->sd_jindex_refresh_time + |
| 132 | gfs2_tune_get(sdp, gt_jindex_refresh_secs) * HZ; |
| 133 | |
| 134 | if (time_after_eq(jiffies, t)) { |
| 135 | if (!gfs2_jindex_hold(sdp, &ji_gh)) |
| 136 | gfs2_glock_dq_uninit(&ji_gh); |
| 137 | sdp->sd_jindex_refresh_time = jiffies; |
| 138 | } |
| 139 | |
| 140 | t = gfs2_tune_get(sdp, gt_logd_secs) * HZ; |
| 141 | schedule_timeout_interruptible(t); |
| 142 | } |
| 143 | |
| 144 | return 0; |
| 145 | } |
| 146 | |
| 147 | /** |
| 148 | * gfs2_quotad - Write cached quota changes into the quota file |
| 149 | * @sdp: Pointer to GFS2 superblock |
| 150 | * |
| 151 | */ |
| 152 | |
| 153 | int gfs2_quotad(void *data) |
| 154 | { |
Steven Whitehouse | b800a1c | 2006-04-24 13:13:56 -0400 | [diff] [blame] | 155 | struct gfs2_sbd *sdp = data; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 156 | unsigned long t; |
| 157 | int error; |
| 158 | |
| 159 | while (!kthread_should_stop()) { |
| 160 | /* Update the master statfs file */ |
| 161 | |
| 162 | t = sdp->sd_statfs_sync_time + |
| 163 | gfs2_tune_get(sdp, gt_statfs_quantum) * HZ; |
| 164 | |
| 165 | if (time_after_eq(jiffies, t)) { |
| 166 | error = gfs2_statfs_sync(sdp); |
| 167 | if (error && |
| 168 | error != -EROFS && |
| 169 | !test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) |
| 170 | fs_err(sdp, "quotad: (1) error=%d\n", error); |
| 171 | sdp->sd_statfs_sync_time = jiffies; |
| 172 | } |
| 173 | |
| 174 | /* Update quota file */ |
| 175 | |
| 176 | t = sdp->sd_quota_sync_time + |
| 177 | gfs2_tune_get(sdp, gt_quota_quantum) * HZ; |
| 178 | |
| 179 | if (time_after_eq(jiffies, t)) { |
| 180 | error = gfs2_quota_sync(sdp); |
| 181 | if (error && |
| 182 | error != -EROFS && |
| 183 | !test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) |
| 184 | fs_err(sdp, "quotad: (2) error=%d\n", error); |
| 185 | sdp->sd_quota_sync_time = jiffies; |
| 186 | } |
| 187 | |
| 188 | gfs2_quota_scan(sdp); |
| 189 | |
| 190 | t = gfs2_tune_get(sdp, gt_quotad_secs) * HZ; |
| 191 | schedule_timeout_interruptible(t); |
| 192 | } |
| 193 | |
| 194 | return 0; |
| 195 | } |
| 196 | |