1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 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 version 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 <linux/lm_interface.h>
19 #include <linux/freezer.h>
20
21 #include "gfs2.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 "util.h"
30
31 /* This uses schedule_timeout() instead of msleep() because it's good for
32 the daemons to wake up more often than the timeout when unmounting so
33 the user's unmount doesn't sit there forever.
34
35 The kthread functions used to start these daemons block and flush signals. */
36
37 /**
38 * gfs2_glockd - Reclaim unused glock structures
39 * @sdp: Pointer to GFS2 superblock
40 *
41 * One or more of these daemons run, reclaiming glocks on sd_reclaim_list.
42 * Number of daemons can be set by user, with num_glockd mount option.
43 */
44
45 int gfs2_glockd(void *data)
46 {
47 struct gfs2_sbd *sdp = data;
48
49 while (!kthread_should_stop()) {
50 while (atomic_read(&sdp->sd_reclaim_count))
51 gfs2_reclaim_glock(sdp);
52
53 wait_event_interruptible(sdp->sd_reclaim_wq,
54 (atomic_read(&sdp->sd_reclaim_count) ||
55 kthread_should_stop()));
56 if (freezing(current))
57 refrigerator();
58 }
59
60 return 0;
61 }
62
63 /**
64 * gfs2_recoverd - Recover dead machine's journals
65 * @sdp: Pointer to GFS2 superblock
66 *
67 */
68
69 int gfs2_recoverd(void *data)
70 {
71 struct gfs2_sbd *sdp = data;
72 unsigned long t;
73
74 while (!kthread_should_stop()) {
75 gfs2_check_journals(sdp);
76 t = gfs2_tune_get(sdp, gt_recoverd_secs) * HZ;
77 if (freezing(current))
78 refrigerator();
79 schedule_timeout_interruptible(t);
80 }
81
82 return 0;
83 }
84
85 /**
86 * gfs2_quotad - Write cached quota changes into the quota file
87 * @sdp: Pointer to GFS2 superblock
88 *
89 */
90
91 int gfs2_quotad(void *data)
92 {
93 struct gfs2_sbd *sdp = data;
94 unsigned long t;
95 int error;
96
97 while (!kthread_should_stop()) {
98 /* Update the master statfs file */
99
100 t = sdp->sd_statfs_sync_time +
101 gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
102
103 if (time_after_eq(jiffies, t)) {
104 error = gfs2_statfs_sync(sdp);
105 if (error &&
106 error != -EROFS &&
107 !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
108 fs_err(sdp, "quotad: (1) error=%d\n", error);
109 sdp->sd_statfs_sync_time = jiffies;
110 }
111
112 /* Update quota file */
113
114 t = sdp->sd_quota_sync_time +
115 gfs2_tune_get(sdp, gt_quota_quantum) * HZ;
116
117 if (time_after_eq(jiffies, t)) {
118 error = gfs2_quota_sync(sdp);
119 if (error &&
120 error != -EROFS &&
121 !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
122 fs_err(sdp, "quotad: (2) error=%d\n", error);
123 sdp->sd_quota_sync_time = jiffies;
124 }
125
126 gfs2_quota_scan(sdp);
127
128 t = gfs2_tune_get(sdp, gt_quotad_secs) * HZ;
129 if (freezing(current))
130 refrigerator();
131 schedule_timeout_interruptible(t);
132 }
133
134 return 0;
135 }
136
137
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