David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame^] | 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 <asm/semaphore.h> |
| 18 | |
| 19 | #include "gfs2.h" |
| 20 | #include "daemon.h" |
| 21 | #include "glock.h" |
| 22 | #include "log.h" |
| 23 | #include "quota.h" |
| 24 | #include "recovery.h" |
| 25 | #include "super.h" |
| 26 | #include "unlinked.h" |
| 27 | |
| 28 | /* This uses schedule_timeout() instead of msleep() because it's good for |
| 29 | the daemons to wake up more often than the timeout when unmounting so |
| 30 | the user's unmount doesn't sit there forever. |
| 31 | |
| 32 | The kthread functions used to start these daemons block and flush signals. */ |
| 33 | |
| 34 | /** |
| 35 | * gfs2_scand - Look for cached glocks and inodes to toss from memory |
| 36 | * @sdp: Pointer to GFS2 superblock |
| 37 | * |
| 38 | * One of these daemons runs, finding candidates to add to sd_reclaim_list. |
| 39 | * See gfs2_glockd() |
| 40 | */ |
| 41 | |
| 42 | int gfs2_scand(void *data) |
| 43 | { |
| 44 | struct gfs2_sbd *sdp = (struct gfs2_sbd *)data; |
| 45 | unsigned long t; |
| 46 | |
| 47 | while (!kthread_should_stop()) { |
| 48 | gfs2_scand_internal(sdp); |
| 49 | t = gfs2_tune_get(sdp, gt_scand_secs) * HZ; |
| 50 | schedule_timeout_interruptible(t); |
| 51 | } |
| 52 | |
| 53 | return 0; |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * gfs2_glockd - Reclaim unused glock structures |
| 58 | * @sdp: Pointer to GFS2 superblock |
| 59 | * |
| 60 | * One or more of these daemons run, reclaiming glocks on sd_reclaim_list. |
| 61 | * Number of daemons can be set by user, with num_glockd mount option. |
| 62 | */ |
| 63 | |
| 64 | int gfs2_glockd(void *data) |
| 65 | { |
| 66 | struct gfs2_sbd *sdp = (struct gfs2_sbd *)data; |
| 67 | DECLARE_WAITQUEUE(wait_chan, current); |
| 68 | |
| 69 | while (!kthread_should_stop()) { |
| 70 | while (atomic_read(&sdp->sd_reclaim_count)) |
| 71 | gfs2_reclaim_glock(sdp); |
| 72 | |
| 73 | set_current_state(TASK_INTERRUPTIBLE); |
| 74 | add_wait_queue(&sdp->sd_reclaim_wq, &wait_chan); |
| 75 | if (!atomic_read(&sdp->sd_reclaim_count) && |
| 76 | !kthread_should_stop()) |
| 77 | schedule(); |
| 78 | remove_wait_queue(&sdp->sd_reclaim_wq, &wait_chan); |
| 79 | set_current_state(TASK_RUNNING); |
| 80 | } |
| 81 | |
| 82 | return 0; |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * gfs2_recoverd - Recover dead machine's journals |
| 87 | * @sdp: Pointer to GFS2 superblock |
| 88 | * |
| 89 | */ |
| 90 | |
| 91 | int gfs2_recoverd(void *data) |
| 92 | { |
| 93 | struct gfs2_sbd *sdp = (struct gfs2_sbd *)data; |
| 94 | unsigned long t; |
| 95 | |
| 96 | while (!kthread_should_stop()) { |
| 97 | gfs2_check_journals(sdp); |
| 98 | t = gfs2_tune_get(sdp, gt_recoverd_secs) * HZ; |
| 99 | schedule_timeout_interruptible(t); |
| 100 | } |
| 101 | |
| 102 | return 0; |
| 103 | } |
| 104 | |
| 105 | /** |
| 106 | * gfs2_logd - Update log tail as Active Items get flushed to in-place blocks |
| 107 | * @sdp: Pointer to GFS2 superblock |
| 108 | * |
| 109 | * Also, periodically check to make sure that we're using the most recent |
| 110 | * journal index. |
| 111 | */ |
| 112 | |
| 113 | int gfs2_logd(void *data) |
| 114 | { |
| 115 | struct gfs2_sbd *sdp = (struct gfs2_sbd *)data; |
| 116 | struct gfs2_holder ji_gh; |
| 117 | unsigned long t; |
| 118 | |
| 119 | while (!kthread_should_stop()) { |
| 120 | /* Advance the log tail */ |
| 121 | |
| 122 | t = sdp->sd_log_flush_time + |
| 123 | gfs2_tune_get(sdp, gt_log_flush_secs) * HZ; |
| 124 | |
| 125 | gfs2_ail1_empty(sdp, DIO_ALL); |
| 126 | |
| 127 | if (time_after_eq(jiffies, t)) { |
| 128 | gfs2_log_flush(sdp); |
| 129 | sdp->sd_log_flush_time = jiffies; |
| 130 | } |
| 131 | |
| 132 | /* Check for latest journal index */ |
| 133 | |
| 134 | t = sdp->sd_jindex_refresh_time + |
| 135 | gfs2_tune_get(sdp, gt_jindex_refresh_secs) * HZ; |
| 136 | |
| 137 | if (time_after_eq(jiffies, t)) { |
| 138 | if (!gfs2_jindex_hold(sdp, &ji_gh)) |
| 139 | gfs2_glock_dq_uninit(&ji_gh); |
| 140 | sdp->sd_jindex_refresh_time = jiffies; |
| 141 | } |
| 142 | |
| 143 | t = gfs2_tune_get(sdp, gt_logd_secs) * HZ; |
| 144 | schedule_timeout_interruptible(t); |
| 145 | } |
| 146 | |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | /** |
| 151 | * gfs2_quotad - Write cached quota changes into the quota file |
| 152 | * @sdp: Pointer to GFS2 superblock |
| 153 | * |
| 154 | */ |
| 155 | |
| 156 | int gfs2_quotad(void *data) |
| 157 | { |
| 158 | struct gfs2_sbd *sdp = (struct gfs2_sbd *)data; |
| 159 | unsigned long t; |
| 160 | int error; |
| 161 | |
| 162 | while (!kthread_should_stop()) { |
| 163 | /* Update the master statfs file */ |
| 164 | |
| 165 | t = sdp->sd_statfs_sync_time + |
| 166 | gfs2_tune_get(sdp, gt_statfs_quantum) * HZ; |
| 167 | |
| 168 | if (time_after_eq(jiffies, t)) { |
| 169 | error = gfs2_statfs_sync(sdp); |
| 170 | if (error && |
| 171 | error != -EROFS && |
| 172 | !test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) |
| 173 | fs_err(sdp, "quotad: (1) error=%d\n", error); |
| 174 | sdp->sd_statfs_sync_time = jiffies; |
| 175 | } |
| 176 | |
| 177 | /* Update quota file */ |
| 178 | |
| 179 | t = sdp->sd_quota_sync_time + |
| 180 | gfs2_tune_get(sdp, gt_quota_quantum) * HZ; |
| 181 | |
| 182 | if (time_after_eq(jiffies, t)) { |
| 183 | error = gfs2_quota_sync(sdp); |
| 184 | if (error && |
| 185 | error != -EROFS && |
| 186 | !test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) |
| 187 | fs_err(sdp, "quotad: (2) error=%d\n", error); |
| 188 | sdp->sd_quota_sync_time = jiffies; |
| 189 | } |
| 190 | |
| 191 | gfs2_quota_scan(sdp); |
| 192 | |
| 193 | t = gfs2_tune_get(sdp, gt_quotad_secs) * HZ; |
| 194 | schedule_timeout_interruptible(t); |
| 195 | } |
| 196 | |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | /** |
| 201 | * gfs2_inoded - Deallocate unlinked inodes |
| 202 | * @sdp: Pointer to GFS2 superblock |
| 203 | * |
| 204 | */ |
| 205 | |
| 206 | int gfs2_inoded(void *data) |
| 207 | { |
| 208 | struct gfs2_sbd *sdp = (struct gfs2_sbd *)data; |
| 209 | unsigned long t; |
| 210 | int error; |
| 211 | |
| 212 | while (!kthread_should_stop()) { |
| 213 | error = gfs2_unlinked_dealloc(sdp); |
| 214 | if (error && |
| 215 | error != -EROFS && |
| 216 | !test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) |
| 217 | fs_err(sdp, "inoded: error = %d\n", error); |
| 218 | |
| 219 | t = gfs2_tune_get(sdp, gt_inoded_secs) * HZ; |
| 220 | schedule_timeout_interruptible(t); |
| 221 | } |
| 222 | |
| 223 | return 0; |
| 224 | } |
| 225 | |