From 49e05a15beb2aa692303b6a0b3d93e32adb9988d Mon Sep 17 00:00:00 2001
From: cat <chenjinxiang3@huawei.com>
Date: Sat, 13 Sep 2025 15:43:24 +0800
Subject: [PATCH] reboot umount fail

Signed-off-by: cat <chenjinxiang3@huawei.com>
---
 services/init/standard/init_cmds.c | 73 ++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)

diff --git a/services/init/standard/init_cmds.c b/services/init/standard/init_cmds.c
index bdb282e5b..f0e87203e 100755
--- a/services/init/standard/init_cmds.c
+++ b/services/init/standard/init_cmds.c
@@ -30,6 +30,10 @@
 #include <sys/wait.h>
 #include <unistd.h>
 #include <linux/module.h>
+#include <stdio.h>
+#include <dirent.h>
+#include <time.h>
+#include <ctype.h>
 
 #include "bootstage.h"
 #include "fs_manager/fs_manager.h"
@@ -55,6 +59,11 @@
 #define SET_SHUT_STAGE _IOW(BOOT_DETECTOR_IOCTL_BASE, 106, int)
 #define SHUT_STAGE_FRAMEWORK_START 1
 
+#define SYSRQ_TRIGGER_PATH "/proc/sysrq-trigger"
+#define PROC_PATH "/proc"
+#define KILL_WAIT_TIME 100000
+#define INTERVAL_WAIT 10
+
 int GetParamValue(const char *symValue, unsigned int symLen, char *paramValue, unsigned int paramLen)
 {
     INIT_CHECK_RETURN_VALUE((symValue != NULL) && (paramValue != NULL) && (paramLen != 0), -1);
@@ -401,6 +410,65 @@ static void DoStopAllServices(const struct CmdArgs *ctx)
     return;
 }
 
+static void SetDeviceReadonly()
+{
+    FILE *file = fopen(SYSRQ_TRIGGER_PATH, "wb");
+    INIT_ERROR_CHECK(file != NULL, return, "failed to open sysrq file");
+    int byte = fwrite((void *)"u", 1, 1, file);
+    INIT_ERROR_CHECK(byte != 1, fclose(file);
+                     return, "failed to write sysrq file");
+    (void)fclose(file);
+}
+
+static void WaitAfterKillPid()
+{
+    INIT_TIMING_STAT cmdTimer;
+    (void)clock_gettime(CLOCK_MONOTONIC, &cmdTimer.startTime);
+    long long count = 1;
+    while (count > 0) {
+        usleep(INTERVAL_WAIT);
+        count++;
+        (void)clock_gettime(CLOCK_MONOTONIC, &cmdTimer.endTime);
+        long long diff = InitDiffTime(&cmdTimer);
+        if (diff > KILL_WAIT_TIME) {
+            count = 0;
+        }
+    }
+}
+
+static void DoKillAllPid()
+{
+    DIR *procDir = opendir(PROC_PATH);
+    INIT_ERROR_CHECK(procDir != NULL, return, "failed to open proc dir");
+    struct dirent *entry;
+    while ((entry = readdir(procDir)) != NULL) {
+        if (entry->d_type == DT_DIR) {
+            const char *dirName = entry->d_name;
+            if (dirName[0] != '\0' && isdigit(dirName[0])) {
+                size_t len = strlen(dirName);
+                bool isNumeric = true;
+                for (size_t i = 0; i < len; ++i) {
+                    if (!isdigit(dirName[i])) {
+                        isNumeric = false;
+                        break;
+                    }
+                }
+
+                if (isNumeric) {
+                    int pid = atoi(dirName);
+                    if (pid != 1) {
+                        INIT_LOGI("send sig 9 to %d", pid);
+                        INIT_ERROR_CHECK(kill(pid, SIGKILL) == 0, closedir(procDir);
+                                         return, "kill pid %d failed! err %d", pid, errno);
+                    }
+                }
+            }
+        }
+    }
+    WaitAfterKillPid();
+    closedir(procDir);
+}
+
 static void DoUmount(const struct CmdArgs *ctx)
 {
     INIT_LOGI("DoUmount %s",  ctx->argv[0]);
@@ -411,6 +479,11 @@ static void DoUmount(const struct CmdArgs *ctx)
             ret = umount2(ctx->argv[0], MNT_FORCE);
         }
         INIT_CHECK_ONLY_ELOG(ret == 0, "Failed to umount %s, errno %d", ctx->argv[0], errno);
+        if (ret !=0 && strcmp(ctx->argv[0], "/data") == 0) {
+            INIT_LOGE("Doumount data fail, kill all pid and set device readonly");
+            DoKillAllPid();
+            SetDeviceReadonly();
+        }
     } else if (status == MOUNT_UMOUNTED) {
         INIT_LOGI("%s is already umounted", ctx->argv[0]);
     } else {
-- 
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