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annotate packages/fs/jffs2/current/src/background.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
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1 /*
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2 * JFFS2 -- Journalling Flash File System, Version 2.
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3 *
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4 * Copyright (C) 2001 Red Hat, Inc.
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5 *
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6 * Created by David Woodhouse <dwmw2@cambridge.redhat.com>
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7 *
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8 * For licensing information, see the file 'LICENCE' in this directory.
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9 *
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10 * $Id: background.c,v 1.16 2001/10/08 09:22:38 dwmw2 Exp $
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11 *
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12 */
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13
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14 #define __KERNEL_SYSCALLS__
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15
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16 #include <linux/kernel.h>
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17 #include <linux/sched.h>
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18 #include <linux/unistd.h>
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19 #include <linux/jffs2.h>
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20 #include <linux/mtd/mtd.h>
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21 #include <linux/interrupt.h>
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22 #include <linux/completion.h>
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23 #include "nodelist.h"
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24
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25
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26 static int jffs2_garbage_collect_thread(void *);
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27 static int thread_should_wake(struct jffs2_sb_info *c);
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28
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29 void jffs2_garbage_collect_trigger(struct jffs2_sb_info *c)
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30 {
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31 spin_lock_bh(&c->erase_completion_lock);
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32 if (c->gc_task && thread_should_wake(c))
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33 send_sig(SIGHUP, c->gc_task, 1);
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34 spin_unlock_bh(&c->erase_completion_lock);
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35 }
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36
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37 /* This must only ever be called when no GC thread is currently running */
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38 int jffs2_start_garbage_collect_thread(struct jffs2_sb_info *c)
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39 {
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40 pid_t pid;
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41 int ret = 0;
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42
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43 if (c->gc_task)
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44 BUG();
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45
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46 init_MUTEX_LOCKED(&c->gc_thread_start);
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47 init_completion(&c->gc_thread_exit);
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48
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49 pid = kernel_thread(jffs2_garbage_collect_thread, c, CLONE_FS|CLONE_FILES);
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50 if (pid < 0) {
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51 printk(KERN_WARNING "fork failed for JFFS2 garbage collect thread: %d\n", -pid);
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52 complete(&c->gc_thread_exit);
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53 ret = pid;
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54 } else {
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55 /* Wait for it... */
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56 D1(printk(KERN_DEBUG "JFFS2: Garbage collect thread is pid %d\n", pid));
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57 down(&c->gc_thread_start);
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58 }
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59
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60 return ret;
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61 }
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62
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63 void jffs2_stop_garbage_collect_thread(struct jffs2_sb_info *c)
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64 {
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65 spin_lock_bh(&c->erase_completion_lock);
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66 if (c->gc_task) {
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67 D1(printk(KERN_DEBUG "jffs2: Killing GC task %d\n", c->gc_task->pid));
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68 send_sig(SIGKILL, c->gc_task, 1);
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69 }
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70 spin_unlock_bh(&c->erase_completion_lock);
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71 wait_for_completion(&c->gc_thread_exit);
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72 }
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73
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74 static int jffs2_garbage_collect_thread(void *_c)
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75 {
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76 struct jffs2_sb_info *c = _c;
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77
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78 daemonize();
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79 current->tty = NULL;
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80 c->gc_task = current;
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81 up(&c->gc_thread_start);
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82
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83 sprintf(current->comm, "jffs2_gcd_mtd%d", c->mtd->index);
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84
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85 /* FIXME in the 2.2 backport */
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86 current->nice = 10;
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87
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88 for (;;) {
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89 spin_lock_irq(&current->sigmask_lock);
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90 siginitsetinv (&current->blocked, sigmask(SIGHUP) | sigmask(SIGKILL) | sigmask(SIGSTOP) | sigmask(SIGCONT));
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91 recalc_sigpending(current);
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92 spin_unlock_irq(&current->sigmask_lock);
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93
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94 if (!thread_should_wake(c)) {
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95 set_current_state (TASK_INTERRUPTIBLE);
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96 D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread sleeping...\n"));
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97 /* Yes, there's a race here; we checked thread_should_wake() before
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98 setting current->state to TASK_INTERRUPTIBLE. But it doesn't
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99 matter - We don't care if we miss a wakeup, because the GC thread
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100 is only an optimisation anyway. */
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101 schedule();
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102 }
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103
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104 if (current->need_resched)
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105 schedule();
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106
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107 /* Put_super will send a SIGKILL and then wait on the sem.
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108 */
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109 while (signal_pending(current)) {
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110 siginfo_t info;
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111 unsigned long signr;
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112
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113 spin_lock_irq(&current->sigmask_lock);
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114 signr = dequeue_signal(&current->blocked, &info);
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115 spin_unlock_irq(&current->sigmask_lock);
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116
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117 switch(signr) {
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118 case SIGSTOP:
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119 D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread(): SIGSTOP received.\n"));
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120 set_current_state(TASK_STOPPED);
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121 schedule();
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122 break;
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123
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124 case SIGKILL:
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125 D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread(): SIGKILL received.\n"));
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126 spin_lock_bh(&c->erase_completion_lock);
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127 c->gc_task = NULL;
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128 spin_unlock_bh(&c->erase_completion_lock);
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129 complete_and_exit(&c->gc_thread_exit, 0);
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130
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131 case SIGHUP:
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132 D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread(): SIGHUP received.\n"));
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133 break;
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134 default:
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135 D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread(): signal %ld received\n", signr));
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136
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137 }
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138 }
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139 /* We don't want SIGHUP to interrupt us. STOP and KILL are OK though. */
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140 spin_lock_irq(&current->sigmask_lock);
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141 siginitsetinv (&current->blocked, sigmask(SIGKILL) | sigmask(SIGSTOP) | sigmask(SIGCONT));
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142 recalc_sigpending(current);
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143 spin_unlock_irq(&current->sigmask_lock);
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144
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145 D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread(): pass\n"));
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146 jffs2_garbage_collect_pass(c);
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147 }
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148 }
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149
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150 static int thread_should_wake(struct jffs2_sb_info *c)
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151 {
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152 D1(printk(KERN_DEBUG "thread_should_wake(): nr_free_blocks %d, nr_erasing_blocks %d, dirty_size 0x%x\n",
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153 c->nr_free_blocks, c->nr_erasing_blocks, c->dirty_size));
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154 if (c->nr_free_blocks + c->nr_erasing_blocks < JFFS2_RESERVED_BLOCKS_GCTRIGGER &&
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155 c->dirty_size > c->sector_size)
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156 return 1;
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157 else
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158 return 0;
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159 }