cherry pick #30439 to release-5.3

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>

br/pkg/lightning/common/storage_unix.go

@@ -23,13 +23,18 @@ import (
 	"syscall"
 
 	"github.com/pingcap/errors"
+	"github.com/pingcap/failpoint"
 	"golang.org/x/sys/unix"
 )
 
 // GetStorageSize gets storage's capacity and available size
 func GetStorageSize(dir string) (size StorageSize, err error) {
-	var stat unix.Statfs_t
+	failpoint.Inject("GetStorageSize", func(val failpoint.Value) {
+		injectedSize := val.(int)
+		failpoint.Return(StorageSize{Capacity: uint64(injectedSize), Available: uint64(injectedSize)}, nil)
+	})
 
+	var stat unix.Statfs_t
 	err = unix.Statfs(dir, &stat)
 	if err != nil {
 		return size, errors.Annotatef(err, "cannot get disk capacity at %s", dir)

br/pkg/lightning/common/storage_windows.go

@@ -23,6 +23,7 @@ import (
 	"unsafe"
 
 	"github.com/pingcap/errors"
+	"github.com/pingcap/failpoint"
 )
 
 var (
@@ -32,6 +33,10 @@ var (
 
 // GetStorageSize gets storage's capacity and available size
 func GetStorageSize(dir string) (size StorageSize, err error) {
+	failpoint.Inject("GetStorageSize", func(val failpoint.Value) {
+		injectedSize := val.(int)
+		failpoint.Return(StorageSize{Capacity: uint64(injectedSize), Available: uint64(injectedSize)}, nil)
+	})
 	r, _, e := getDiskFreeSpaceExW.Call(
 		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(dir))),
 		uintptr(unsafe.Pointer(&size.Available)),

br/pkg/lightning/restore/check_info.go

@@ -454,33 +454,31 @@ func (rc *Controller) localResource(sourceSize int64) error {
 	if err != nil {
 		return errors.Trace(err)
 	}
-	localAvailable := storageSize.Available
+	localAvailable := int64(storageSize.Available)
 
 	var message string
 	var passed bool
 	switch {
-	case localAvailable > uint64(sourceSize):
+	case localAvailable > sourceSize:
 		message = fmt.Sprintf("local disk resources are rich, estimate sorted data size %s, local available is %s",
 			units.BytesSize(float64(sourceSize)), units.BytesSize(float64(localAvailable)))
 		passed = true
+	case int64(rc.cfg.TikvImporter.DiskQuota) > localAvailable:
+		message = fmt.Sprintf("local disk space may not enough to finish import, estimate sorted data size is %s,"+
+			" but local available is %s, please set `tikv-importer.disk-quota` to a smaller value than %s"+
+			" or change `mydumper.sorted-kv-dir` to another disk with enough space to finish imports",
+			units.BytesSize(float64(sourceSize)),
+			units.BytesSize(float64(localAvailable)), units.BytesSize(float64(localAvailable)))
+		passed = false
+		log.L().Error(message)
 	default:
-		if int64(rc.cfg.TikvImporter.DiskQuota) > int64(localAvailable) {
-			message = fmt.Sprintf("local disk space may not enough to finish import"+
-				"estimate sorted data size is %s, but local available is %s,"+
-				"you need a smaller number for tikv-importer.disk-quota (%s) to finish imports",
-				units.BytesSize(float64(sourceSize)),
-				units.BytesSize(float64(localAvailable)), units.BytesSize(float64(rc.cfg.TikvImporter.DiskQuota)))
-			passed = false
-			log.L().Error(message)
-		} else {
-			message = fmt.Sprintf("local disk space may not enough to finish import, "+
-				"estimate sorted data size is %s, but local available is %s,"+
-				"we will use disk-quota (size: %s) to finish imports, which may slow down import",
-				units.BytesSize(float64(sourceSize)),
-				units.BytesSize(float64(localAvailable)), units.BytesSize(float64(rc.cfg.TikvImporter.DiskQuota)))
-			passed = true
-			log.L().Warn(message)
-		}
+		message = fmt.Sprintf("local disk space may not enough to finish import, "+
+			"estimate sorted data size is %s, but local available is %s,"+
+			"we will use disk-quota (size: %s) to finish imports, which may slow down import",
+			units.BytesSize(float64(sourceSize)),
+			units.BytesSize(float64(localAvailable)), units.BytesSize(float64(rc.cfg.TikvImporter.DiskQuota)))
+		passed = true
+		log.L().Warn(message)
 	}
 	rc.checkTemplate.Collect(Critical, passed, message)
 	return nil