commit the binary to hotfix branch

In #11888 we observe a lot of running, WalkDir calls.

There doesn't appear to be any listerners for these calls, so they should be aborted.

Ensure that WalkDir aborts when upstream cancels the request.

Fixes #11888

cmd/common-main.go

@@ -429,3 +429,13 @@ func getTLSConfig() (x509Certs []*x509.Certificate, manager *certs.Manager, secu
 	secureConn = true
 	return x509Certs, manager, secureConn, nil
 }
+
+// contextCanceled returns whether a context is canceled.
+func contextCanceled(ctx context.Context) bool {
+	select {
+	case <-ctx.Done():
+		return true
+	default:
+		return false
+	}
+}

cmd/metacache-set.go

@@ -811,9 +811,8 @@ func listPathRaw(ctx context.Context, opts listPathRawOptions) (err error) {
 	if len(disks) == 0 {
 		return fmt.Errorf("listPathRaw: 0 drives provided")
 	}
-
-	// Disconnect from call above, but cancel on exit.
-	ctx, cancel := context.WithCancel(GlobalContext)
+	// Cancel upstream if we finish before we expect.
+	ctx, cancel := context.WithCancel(ctx)
 	defer cancel()
 
 	askDisks := len(disks)
@@ -825,6 +824,8 @@ func listPathRaw(ctx context.Context, opts listPathRawOptions) (err error) {
 		if err != nil {
 			return err
 		}
+		// Make sure we close the pipe so blocked writes doesn't stay around.
+		defer r.CloseWithError(context.Canceled)
 		// Send request to each disk.
 		go func() {
 			werr := d.WalkDir(ctx, WalkDirOptions{
@@ -836,7 +837,10 @@ func listPathRaw(ctx context.Context, opts listPathRawOptions) (err error) {
 				ForwardTo:      opts.forwardTo,
 			}, w)
 			w.CloseWithError(werr)
-			if werr != io.EOF && werr != nil && werr.Error() != errFileNotFound.Error() && werr.Error() != errVolumeNotFound.Error() {
+			if werr != io.EOF && werr != nil &&
+				werr.Error() != errFileNotFound.Error() &&
+				werr.Error() != errVolumeNotFound.Error() &&
+				!errors.Is(werr, context.Canceled) {
 				logger.LogIf(ctx, werr)
 			}
 		}()

cmd/metacache-walk.go

@@ -113,6 +113,12 @@ func (s *xlStorage) WalkDir(ctx context.Context, opts WalkDirOptions, wr io.Writ
 	forward := opts.ForwardTo
 	var scanDir func(path string) error
 	scanDir = func(current string) error {
+		if len(current) > 0 && !strings.HasPrefix(current, prefix) {
+			return nil
+		}
+		if contextCanceled(ctx) {
+			return ctx.Err()
+		}
 		entries, err := s.ListDir(ctx, opts.Bucket, current, -1)
 		if err != nil {
 			// Folder could have gone away in-between
@@ -127,9 +133,6 @@ func (s *xlStorage) WalkDir(ctx context.Context, opts WalkDirOptions, wr io.Writ
 		}
 		dirObjects := make(map[string]struct{})
 		for i, entry := range entries {
-			if len(prefix) > 0 && !strings.HasPrefix(entry, prefix) {
-				continue
-			}
 			if len(forward) > 0 && entry < forward {
 				continue
 			}
@@ -148,6 +151,9 @@ func (s *xlStorage) WalkDir(ctx context.Context, opts WalkDirOptions, wr io.Writ
 			// Do do not retain the file.
 			entries[i] = ""
 
+			if contextCanceled(ctx) {
+				return ctx.Err()
+			}
 			// If root was an object return it as such.
 			if HasSuffix(entry, xlStorageFormatFile) {
 				var meta metaCacheEntry
@@ -183,12 +189,13 @@ func (s *xlStorage) WalkDir(ctx context.Context, opts WalkDirOptions, wr io.Writ
 		// Process in sort order.
 		sort.Strings(entries)
 		dirStack := make([]string, 0, 5)
-		prefix = "" // Remove prefix after first level.
-
 		for _, entry := range entries {
 			if entry == "" {
 				continue
 			}
+			if contextCanceled(ctx) {
+				return ctx.Err()
+			}
 			meta := metaCacheEntry{name: PathJoin(current, entry)}
 
 			// If directory entry on stack before this, pop it now.