mirror of
https://github.com/openharmony/third_party_Linux_Kernel.git
synced 2026-07-18 16:54:34 -04:00
Caoruihong
c4e7b6018f
Signed-off-by: Caoruihong <crh.cao@huawei.com> Change-Id: I2b0e06b01d27702204421193054608ebe77be575
123 lines
3.4 KiB
C
Executable File
123 lines
3.4 KiB
C
Executable File
/*
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* JFFS2 -- Journalling Flash File System, Version 2.
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*
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* Copyright © 2001-2007 Red Hat, Inc.
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* Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
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*
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* Created by David Woodhouse <dwmw2@infradead.org>
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*
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* For licensing information, see the file 'LICENCE' in this directory.
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*
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*/
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#include <linux/kernel.h>
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#include <stdio.h>
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#include "nodelist.h"
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#include "vfs_jffs2.h"
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#include "mtd_partition.h"
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#define GC_THREAD_FLAG_TRIG 1
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#define GC_THREAD_FLAG_STOP 2
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#define GC_THREAD_FLAG_HAS_EXIT 4
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extern struct MtdNorDev jffs2_dev_list[CONFIG_MTD_PATTITION_NUM];
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static void jffs2_garbage_collect_thread(unsigned long data);
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void jffs2_garbage_collect_trigger(struct jffs2_sb_info *c)
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{
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struct super_block *sb = OFNI_BS_2SFFJ(c);
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/* Wake up the thread */
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jffs2_dbg(1, "jffs2_garbage_collect_trigger\n");
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LOS_EventWrite(&sb->s_gc_thread_flags, GC_THREAD_FLAG_TRIG);
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}
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/* This must only ever be called when no GC thread is currently running */
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void jffs2_start_garbage_collect_thread(struct jffs2_sb_info *c)
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{
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struct super_block *sb = OFNI_BS_2SFFJ(c);
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TSK_INIT_PARAM_S stGcTask;
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if (c == NULL)
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return;
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if (sb->s_root == NULL)
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return;
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LOS_EventInit(&sb->s_gc_thread_flags);
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/* Start the thread. Doesn't matter if it fails -- it's only an
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* optimisation anyway */
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(void)memset_s(&stGcTask, sizeof(TSK_INIT_PARAM_S), 0, sizeof(TSK_INIT_PARAM_S));
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stGcTask.pfnTaskEntry = (TSK_ENTRY_FUNC)jffs2_garbage_collect_thread;
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stGcTask.auwArgs[0] = (UINTPTR)c;
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stGcTask.uwStackSize = LOSCFG_BASE_CORE_TSK_DEFAULT_STACK_SIZE;
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stGcTask.pcName = "jffs2_gc_thread";
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#ifdef LOSCFG_KERNEL_SMP
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unsigned int i;
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for (i = 0; i < CONFIG_MTD_PATTITION_NUM; i++) {
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if (sb->s_dev == &jffs2_dev_list[i])
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break;
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}
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stGcTask.usCpuAffiMask = CPUID_TO_AFFI_MASK(i % LOSCFG_KERNEL_CORE_NUM);
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#endif
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stGcTask.usTaskPrio = JFFS2_GC_THREAD_PRIORITY;
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if (LOS_TaskCreate(&sb->s_gc_thread, &stGcTask))
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JFFS2_ERROR("Create gc task failed!!!\n");
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}
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void jffs2_stop_garbage_collect_thread(struct jffs2_sb_info *c)
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{
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struct super_block *sb = OFNI_BS_2SFFJ(c);
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JFFS2_DEBUG("jffs2_stop_garbage_collect_thread\n");
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/* Stop the thread and wait for it if necessary */
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LOS_EventWrite(&sb->s_gc_thread_flags, GC_THREAD_FLAG_STOP);
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JFFS2_DEBUG("jffs2_stop_garbage_collect_thread wait\n");
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(void)LOS_EventRead(&sb->s_gc_thread_flags,
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GC_THREAD_FLAG_HAS_EXIT,
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LOS_WAITMODE_OR | LOS_WAITMODE_CLR,
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LOS_WAIT_FOREVER);
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// Kill and free the resources ... this is safe due to the flag
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// from the thread.
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(void)LOS_TaskDelete(sb->s_gc_thread);
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(void)LOS_EventWrite(&sb->s_gc_thread_flags, 0xFFFFFFFF);
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}
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static void jffs2_garbage_collect_thread(unsigned long data)
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{
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struct jffs2_sb_info *c = (struct jffs2_sb_info *)data;
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struct super_block *sb = OFNI_BS_2SFFJ(c);
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unsigned int flag = 0;
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jffs2_dbg(1, "jffs2_garbage_collect_thread START\n");
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while(1) {
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flag = LOS_EventRead(&sb->s_gc_thread_flags,
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GC_THREAD_FLAG_TRIG | GC_THREAD_FLAG_STOP,
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LOS_WAITMODE_OR | LOS_WAITMODE_CLR,
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LOS_WAIT_FOREVER
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);
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if (flag & GC_THREAD_FLAG_STOP)
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break;
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jffs2_dbg(1, "jffs2: GC THREAD GC BEGIN\n");
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if (sb->s_root == NULL)
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return;
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if (jffs2_garbage_collect_pass(c) == -ENOSPC) {
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PRINTK("No space for garbage collection. "
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"Aborting JFFS2 GC thread\n");
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break;
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}
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jffs2_dbg(1, "jffs2: GC THREAD GC END\n");
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}
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JFFS2_DEBUG("jffs2_garbage_collect_thread EXIT\n");
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LOS_EventWrite(&sb->s_gc_thread_flags, GC_THREAD_FLAG_HAS_EXIT);
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}
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