Fix incorrect Status::NoSpace() status check (#8504)

Summary:
If we want to check whether a Status s is NoSpace() or not, we should check the subcode instread of using s==Status::NoSpace(). Fix some of the incorrect check in the ErrorHandler.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8504

Test Plan: make check

Reviewed By: anand1976

Differential Revision: D29601764

Pulled By: zhichao-cao

fbshipit-source-id: cdab56a827891c23746bba9cbb53f169fe35f086

db/error_handler.cc

@@ -327,7 +327,8 @@ const Status& ErrorHandler::SetBGError(const Status& bg_err,
   }
 
   // Allow some error specific overrides
-  if (new_bg_err == Status::NoSpace()) {
+  if (new_bg_err.subcode() == IOStatus::SubCode::kNoSpace ||
+      new_bg_err.subcode() == IOStatus::SubCode::kSpaceLimit) {
     new_bg_err = OverrideNoSpaceError(new_bg_err, &auto_recovery);
   }
 
@@ -349,7 +350,8 @@ const Status& ErrorHandler::SetBGError(const Status& bg_err,
     recovery_in_prog_ = true;
 
     // Kick-off error specific recovery
-    if (bg_error_ == Status::NoSpace()) {
+    if (new_bg_err.subcode() == IOStatus::SubCode::kNoSpace ||
+        new_bg_err.subcode() == IOStatus::SubCode::kSpaceLimit) {
       RecoverFromNoSpace();
     }
   }

file/sst_file_manager_impl.cc

@@ -317,7 +317,7 @@ void SstFileManagerImpl::ClearError() {
         // error is also a NoSpace() non-fatal error, leave the instance in
         // the list
         Status err = cur_instance_->GetBGError();
-        if (s.ok() && err == Status::NoSpace() &&
+        if (s.ok() && err.subcode() == IOStatus::SubCode::kNoSpace &&
             err.severity() < Status::Severity::kFatalError) {
           s = err;
         }

utilities/fault_injection_env.h

@@ -179,7 +179,8 @@ class FaultInjectionTestEnv : public EnvWrapper {
 #undef GetFreeSpace
   virtual Status GetFreeSpace(const std::string& path,
                               uint64_t* disk_free) override {
-    if (!IsFilesystemActive() && error_ == Status::NoSpace()) {
+    if (!IsFilesystemActive() &&
+        error_.subcode() == IOStatus::SubCode::kNoSpace) {
       *disk_free = 0;
       return Status::OK();
     } else {

utilities/fault_injection_fs.h

@@ -240,7 +240,8 @@ class FaultInjectionTestFS : public FileSystemWrapper {
                                 const IOOptions& options, uint64_t* disk_free,
                                 IODebugContext* dbg) override {
     IOStatus io_s;
-    if (!IsFilesystemActive() && error_ == IOStatus::NoSpace()) {
+    if (!IsFilesystemActive() &&
+        error_.subcode() == IOStatus::SubCode::kNoSpace) {
       *disk_free = 0;
     } else {
       io_s = target()->GetFreeSpace(path, options, disk_free, dbg);