remove checkBucketExist check entirely to avoid fan-out calls (#18917)

Each Put, List, Multipart operations heavily rely on making
GetBucketInfo() call to verify if bucket exists or not on
a regular basis. This has a large performance cost when there
are tons of servers involved.

We did optimize this part by vectorizing the bucket calls,
however its not enough, beyond 100 nodes and this becomes
fairly visible in terms of performance.

cmd/metacache-set.go

@@ -427,7 +427,7 @@ func (er *erasureObjects) streamMetadataParts(ctx context.Context, o listPathOpt
 				if !disk.IsOnline() {
 					continue
 				}
-				_, err := disk.ReadVersion(ctx, minioMetaBucket,
+				_, err := disk.ReadVersion(ctx, "", minioMetaBucket,
 					o.objectPath(0), "", ReadOptions{})
 				if err != nil {
 					time.Sleep(retryDelay250)
@@ -504,7 +504,7 @@ func (er *erasureObjects) streamMetadataParts(ctx context.Context, o listPathOpt
 						if !disk.IsOnline() {
 							continue
 						}
-						_, err := disk.ReadVersion(ctx, minioMetaBucket,
+						_, err := disk.ReadVersion(ctx, "", minioMetaBucket,
 							o.objectPath(partN), "", ReadOptions{})
 						if err != nil {
 							time.Sleep(retryDelay250)
@@ -1057,7 +1057,7 @@ func listPathRaw(ctx context.Context, opts listPathRawOptions) (err error) {
 	for {
 		// Get the top entry from each
 		var current metaCacheEntry
-		var atEOF, fnf, hasErr, agree int
+		var atEOF, fnf, vnf, hasErr, agree int
 		for i := range topEntries {
 			topEntries[i] = metaCacheEntry{}
 		}
@@ -1083,6 +1083,11 @@ func listPathRaw(ctx context.Context, opts listPathRawOptions) (err error) {
 					errDiskNotFound.Error():
 					atEOF++
 					fnf++
+					// This is a special case, to handle bucket does
+					// not exist situations.
+					if errors.Is(err, errVolumeNotFound) {
+						vnf++
+					}
 					continue
 				}
 				hasErr++
@@ -1140,6 +1145,10 @@ func listPathRaw(ctx context.Context, opts listPathRawOptions) (err error) {
 			return errors.New(strings.Join(combinedErr, ", "))
 		}
 
+		if vnf == len(readers) {
+			return errVolumeNotFound
+		}
+
 		// Break if all at EOF or error.
 		if atEOF+hasErr == len(readers) {
 			if hasErr > 0 && opts.finished != nil {
@@ -1147,9 +1156,11 @@ func listPathRaw(ctx context.Context, opts listPathRawOptions) (err error) {
 			}
 			break
 		}
+
 		if fnf == len(readers) {
 			return errFileNotFound
 		}
+
 		if agree == len(readers) {
 			// Everybody agreed
 			for _, r := range readers {