// OfflineDisk represents an unavailable disk.
var OfflineDisk StorageAPI // zero value is nil

// erasureObjects - Implements ER object layer.
type erasureObjects struct {
	setDriveCount      int
	defaultParityCount int

	setIndex  int
	poolIndex int

	// getDisks returns list of storageAPIs.
	getDisks func() []StorageAPI

	// getLockers returns list of remote and local lockers.

// NewMultipartUpload metadata shuffling.
func shuffleDisksAndPartsMetadataByIndex(disks []StorageAPI, metaArr []FileInfo, fi FileInfo) (shuffledDisks []StorageAPI, shuffledPartsMetadata []FileInfo) {
	shuffledDisks = make([]StorageAPI, len(disks))
	shuffledPartsMetadata = make([]FileInfo, len(disks))
	distribution := fi.Erasure.Distribution

	var inconsistent int

}

// Returns whole-file bitrot writer.
func newWholeBitrotWriter(disk StorageAPI, volume, filePath string, algo BitrotAlgorithm, shardSize int64) io.WriteCloser {
	return &wholeBitrotWriter{disk, volume, filePath, shardSize, algo.New()}
}

// Implementation to verify bitrot for the whole file.
type wholeBitrotReader struct {
	disk       StorageAPI
	volume     string
	filePath   string

package cmd

import (
	"context"
	"fmt"
	"io"
	"math/rand"
	"sync"
	"time"

	"github.com/minio/pkg/v2/sync/errgroup"
)

func (er erasureObjects) getOnlineDisks() (newDisks []StorageAPI) {
	disks := er.getDisks()
	var wg sync.WaitGroup
	var mu sync.Mutex
	r := rand.New(rand.NewSource(time.Now().UnixNano()))
	for _, i := range r.Perm(len(disks)) {
		i := i
		wg.Add(1)
		go func() {

			t.Fatalf("Test %d: Failed to upload a random object: %v", i+1, err)
		}

		// Step 3: Upload the object with some disks offline
		sets.erasureDisksMu.Lock()
		xl.getDisks = func() []StorageAPI {
			disks := make([]StorageAPI, len(origErasureDisks))
			copy(disks, origErasureDisks)
			disks[0] = nil
			disks[1] = nil
			return disks
		}
		sets.erasureDisksMu.Unlock()

				commonCount = ops
			}
		}
		if max < readQuorum {
			return 0
		}
		return commonCount
	}

	return filter()
}

func getQuorumDiskInfos(disks []StorageAPI, infos []DiskInfo, readQuorum int) (newDisks []StorageAPI, newInfos []DiskInfo) {
	commonMutations := calcCommonCounter(infos, readQuorum)
	for i, info := range infos {
		mutations := info.Metrics.TotalDeletes + info.Metrics.TotalWrites

}

// relinquishes the underlying connection for all storage disks.
func closeStorageDisks(storageDisks ...StorageAPI) {
	var wg sync.WaitGroup
	for _, disk := range storageDisks {
		if disk == nil {
			continue
		}
		wg.Add(1)
		go func(disk StorageAPI) {
			defer wg.Done()
			disk.Close()
		}(disk)
	}
	wg.Wait()
}

// Initialize storage disks for each endpoint.

// are set to nil.
// - latest (in time) of the maximally occurring modTime(s), which has at least quorum occurrences.
func listOnlineDisks(disks []StorageAPI, partsMetadata []FileInfo, errs []error, quorum int) (onlineDisks []StorageAPI, modTime time.Time, etag string) {
	onlineDisks = make([]StorageAPI, len(disks))

	// List all the file commit ids from parts metadata.
	modTimes := listObjectModtimes(partsMetadata, errs)

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package cmd

import (
	"context"
	"io"
	"time"

	"github.com/minio/madmin-go/v3"
)

// StorageAPI interface.
type StorageAPI interface {
	// Stringified version of disk.
	String() string

	// Storage operations.

	// Returns true if disk is online and its valid i.e valid format.json.

			continue
		}
		wg.Add(1)
		go func(disk StorageAPI) {
			defer wg.Done()
			disk.Delete(ctx, bucket, prefix, DeleteOptions{
				Recursive: true,
				Immediate: false,
			})
		}(disk)
	}
	wg.Wait()
}

// Remove the old multipart uploads on the given disk.
func (er erasureObjects) cleanupStaleUploadsOnDisk(ctx context.Context, disk StorageAPI, expiry time.Duration) {
	drivePath := disk.Endpoint().Path