Merge "Add API to get remaining lifetime as a percentage." into main

IdleMaint.cpp

@@ -507,6 +507,30 @@ int32_t GetStorageLifeTime() {
     return -1;
 }
 
+int32_t GetStorageRemainingLifetime() {
+    std::string path = getDevSysfsPath();
+    if (path.empty()) {
+        return -1;
+    }
+
+    std::string lifeTimeBasePath = path + "/health_descriptor/life_time_estimation_";
+
+    int32_t lifeTime = getLifeTime(lifeTimeBasePath + "c");
+    if (lifeTime == -1) {
+        int32_t lifeTimeA = getLifeTime(lifeTimeBasePath + "a");
+        int32_t lifeTimeB = getLifeTime(lifeTimeBasePath + "b");
+        lifeTime = std::max(lifeTimeA, lifeTimeB);
+        if (lifeTime <= 0) {
+            return -1;
+        }
+
+        // 1 = 0-10% used, 10 = 90-100% used. Subtract 1 so that a brand new
+        // device looks 0% used.
+        lifeTime = (lifeTime - 1) * 10;
+    }
+    return 100 - std::clamp(lifeTime, 0, 100);
+}
+
 void SetGCUrgentPace(int32_t neededSegments, int32_t minSegmentThreshold, float dirtyReclaimRate,
                      float reclaimWeight, int32_t gcPeriod, int32_t minGCSleepTime,
                      int32_t targetDirtyRatio) {

IdleMaint.h

@@ -26,6 +26,7 @@ void Trim(const android::sp<android::os::IVoldTaskListener>& listener);
 int RunIdleMaint(bool needGC, const android::sp<android::os::IVoldTaskListener>& listener);
 int AbortIdleMaint(const android::sp<android::os::IVoldTaskListener>& listener);
 int32_t GetStorageLifeTime();
+int32_t GetStorageRemainingLifetime();
 void SetGCUrgentPace(int32_t neededSegments, int32_t minSegmentThreshold, float dirtyReclaimRate,
                      float reclaimWeight, int32_t gcPeriod, int32_t minGCSleepTime,
                      int32_t targetDirtyRatio);

VoldNativeService.cpp

@@ -504,6 +504,14 @@ binder::Status VoldNativeService::getStorageLifeTime(int32_t* _aidl_return) {
     return Ok();
 }
 
+binder::Status VoldNativeService::getStorageRemainingLifetime(int32_t* _aidl_return) {
+    ENFORCE_SYSTEM_OR_ROOT;
+    ACQUIRE_LOCK;
+
+    *_aidl_return = GetStorageRemainingLifetime();
+    return Ok();
+}
+
 binder::Status VoldNativeService::setGCUrgentPace(int32_t neededSegments,
                                                   int32_t minSegmentThreshold,
                                                   float dirtyReclaimRate, float reclaimWeight,

VoldNativeService.h

@@ -89,6 +89,7 @@ class VoldNativeService : public BinderService<VoldNativeService>, public os::Bn
                                 const android::sp<android::os::IVoldTaskListener>& listener);
     binder::Status abortIdleMaint(const android::sp<android::os::IVoldTaskListener>& listener);
     binder::Status getStorageLifeTime(int32_t* _aidl_return);
+    binder::Status getStorageRemainingLifetime(int32_t* _aidl_return);
     binder::Status setGCUrgentPace(int32_t neededSegments, int32_t minSegmentThreshold,
                                    float dirtyReclaimRate, float reclaimWeight, int32_t gcPeriod,
                                    int32_t minGCSleepTime, int32_t targetDirtyRatio);

binder/android/os/IVold.aidl

@@ -66,6 +66,8 @@ interface IVold {
     void fstrim(int fstrimFlags, IVoldTaskListener listener);
     void runIdleMaint(boolean needGC, IVoldTaskListener listener);
     void abortIdleMaint(IVoldTaskListener listener);
+    // Returns the amount of storage lifetime used, as a percentage.
+    // (eg, 10 indicates 10% of lifetime used), or -1 on failure.
     int getStorageLifeTime();
     void setGCUrgentPace(int neededSegments, int minSegmentThreshold,
                          float dirtyReclaimRate, float reclaimWeight,
@@ -135,6 +137,11 @@ interface IVold {
 
     long getStorageSize();
 
+    // Returns the remaining storage lifetime as a percentage, rounded up as
+    // needed when the underlying hardware reports low precision. Returns -1
+    // on failure.
+    int getStorageRemainingLifetime();
+
     const int FSTRIM_FLAG_DEEP_TRIM = 1;
 
     const int MOUNT_FLAG_PRIMARY = 1;