handle fresh setup with mixed drives (minio#10273)

fresh drive setups when one of the drive is
a root drive, we should ignore such a root
drive and not proceed to format.

This PR handles this properly by marking
the disks which are root disk and they are
taken offline.

cmd/background-newdisks-heal-ops.go

@@ -18,6 +18,7 @@ package cmd
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"time"
 
@@ -86,7 +87,7 @@ func getLocalDisksToHeal(objAPI ObjectLayer) []Endpoints {
 			// Try to connect to the current endpoint
 			// and reformat if the current disk is not formatted
 			_, _, err := connectEndpoint(endpoint)
-			if err == errUnformattedDisk {
+			if errors.Is(err, errUnformattedDisk) {
 				localDisksToHeal = append(localDisksToHeal, endpoint)
 			}
 		}

cmd/erasure-sets.go

@@ -18,6 +18,7 @@ package cmd
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"hash/crc32"
 	"io"
@@ -137,7 +138,14 @@ func connectEndpoint(endpoint Endpoint) (StorageAPI, *formatErasureV3, error) {
 	if err != nil {
 		// Close the internal connection to avoid connection leaks.
 		disk.Close()
-		return nil, nil, err
+		if errors.Is(err, errUnformattedDisk) {
+			info, derr := disk.DiskInfo()
+			if derr != nil && info.RootDisk {
+				return nil, nil, fmt.Errorf("Disk: %s returned %w but its a root disk refusing to use it",
+					disk, derr) // make sure to '%w' to wrap the error
+			}
+		}
+		return nil, nil, fmt.Errorf("Disk: %s returned %w", disk, err) // make sure to '%w' to wrap the error
 	}
 
 	return disk, format, nil
@@ -1274,39 +1282,39 @@ func isTestSetup(infos []DiskInfo, errs []error) bool {
 	return rootDiskCount == len(infos)
 }
 
-func getHealDiskInfos(storageDisks []StorageAPI) ([]DiskInfo, []error) {
+func getHealDiskInfos(storageDisks []StorageAPI, errs []error) ([]DiskInfo, []error) {
 	infos := make([]DiskInfo, len(storageDisks))
 	g := errgroup.WithNErrs(len(storageDisks))
 	for index := range storageDisks {
 		index := index
 		g.Go(func() error {
-			var err error
-			if storageDisks[index] != nil {
-				infos[index], err = storageDisks[index].DiskInfo()
-			} else {
-				// Disk not found.
-				err = errDiskNotFound
+			if errs[index] != nil && errs[index] != errUnformattedDisk {
+				return errs[index]
+			}
+			if storageDisks[index] == nil {
+				return errDiskNotFound
 			}
+			var err error
+			infos[index], err = storageDisks[index].DiskInfo()
 			return err
 		}, index)
 	}
 	return infos, g.Wait()
 }
 
 // Mark root disks as down so as not to heal them.
-func markRootDisksAsDown(storageDisks []StorageAPI) {
-	infos, errs := getHealDiskInfos(storageDisks)
-	if isTestSetup(infos, errs) {
-		// Allow healing of disks for test setups to help with testing.
-		return
-	}
-	for i := range storageDisks {
-		if infos[i].RootDisk {
-			// We should not heal on root disk. i.e in a situation where the minio-administrator has unmounted a
-			// defective drive we should not heal a path on the root disk.
-			logger.Info("Disk `%s` is a root disk. Please ensure the disk is mounted properly, refusing to use root disk.",
-				storageDisks[i].String())
-			storageDisks[i] = nil
+func markRootDisksAsDown(storageDisks []StorageAPI, errs []error) {
+	var infos []DiskInfo
+	infos, errs = getHealDiskInfos(storageDisks, errs)
+	if !isTestSetup(infos, errs) {
+		for i := range storageDisks {
+			if storageDisks[i] != nil && infos[i].RootDisk {
+				// We should not heal on root disk. i.e in a situation where the minio-administrator has unmounted a
+				// defective drive we should not heal a path on the root disk.
+				logger.Info("Disk `%s` is a root disk. Please ensure the disk is mounted properly, refusing to use root disk.",
+					storageDisks[i].String())
+				storageDisks[i] = nil
+			}
 		}
 	}
 }
@@ -1326,13 +1334,14 @@ func (s *erasureSets) HealFormat(ctx context.Context, dryRun bool) (res madmin.H
 		}
 	}(storageDisks)
 
-	markRootDisksAsDown(storageDisks)
-
 	formats, sErrs := loadFormatErasureAll(storageDisks, true)
 	if err = checkFormatErasureValues(formats, s.drivesPerSet); err != nil {
 		return madmin.HealResultItem{}, err
 	}
 
+	// Mark all root disks down
+	markRootDisksAsDown(storageDisks, sErrs)
+
 	// Prepare heal-result
 	res = madmin.HealResultItem{
 		Type:      madmin.HealItemMetadata,

cmd/erasure.go

@@ -154,6 +154,7 @@ func getDisksInfo(disks []StorageAPI, endpoints []string) (disksInfo []madmin.Di
 				UsedSpace:      info.Used,
 				AvailableSpace: info.Free,
 				UUID:           info.ID,
+				RootDisk:       info.RootDisk,
 				State:          diskErrToDriveState(err),
 			}
 			if info.Total > 0 {
@@ -175,7 +176,27 @@ func getDisksInfo(disks []StorageAPI, endpoints []string) (disksInfo []madmin.Di
 		onlineDisks[ep]++
 	}
 
-	// Success.
+	rootDiskCount := 0
+	for _, di := range disksInfo {
+		if di.RootDisk {
+			rootDiskCount++
+		}
+	}
+
+	if len(disksInfo) == rootDiskCount {
+		// Success.
+		return disksInfo, errs, onlineDisks, offlineDisks
+	}
+
+	// Root disk should be considered offline
+	for i := range disksInfo {
+		ep := disksInfo[i].Endpoint
+		if disksInfo[i].RootDisk {
+			offlineDisks[ep]++
+			onlineDisks[ep]--
+		}
+	}
+
 	return disksInfo, errs, onlineDisks, offlineDisks
 }
 

cmd/format-erasure.go

@@ -335,11 +335,13 @@ func loadFormatErasureAll(storageDisks []StorageAPI, heal bool) ([]*formatErasur
 	return formats, g.Wait()
 }
 
-func saveFormatErasure(disk StorageAPI, format interface{}, diskID string) error {
-	if format == nil || disk == nil {
+func saveFormatErasure(disk StorageAPI, format *formatErasureV3) error {
+	if disk == nil || format == nil {
 		return errDiskNotFound
 	}
 
+	diskID := format.Erasure.This
+
 	if err := makeFormatErasureMetaVolumes(disk); err != nil {
 		return err
 	}
@@ -549,7 +551,7 @@ func formatErasureFixLocalDeploymentID(endpoints Endpoints, storageDisks []Stora
 					return nil
 				}
 				format.ID = refFormat.ID
-				if err := saveFormatErasure(storageDisks[index], format, format.Erasure.This); err != nil {
+				if err := saveFormatErasure(storageDisks[index], format); err != nil {
 					logger.LogIf(GlobalContext, err)
 					return fmt.Errorf("Unable to save format.json, %w", err)
 				}
@@ -695,7 +697,7 @@ func saveFormatErasureAll(ctx context.Context, storageDisks []StorageAPI, format
 			if formats[index] == nil {
 				return errDiskNotFound
 			}
-			return saveFormatErasure(storageDisks[index], formats[index], formats[index].Erasure.This)
+			return saveFormatErasure(storageDisks[index], formats[index])
 		}, index)
 	}
 
@@ -722,13 +724,9 @@ func initStorageDisksWithErrors(endpoints Endpoints) ([]StorageAPI, []error) {
 	g := errgroup.WithNErrs(len(endpoints))
 	for index := range endpoints {
 		index := index
-		g.Go(func() error {
-			storageDisk, err := newStorageAPI(endpoints[index])
-			if err != nil {
-				return err
-			}
-			storageDisks[index] = storageDisk
-			return nil
+		g.Go(func() (err error) {
+			storageDisks[index], err = newStorageAPI(endpoints[index])
+			return err
 		}, index)
 	}
 	return storageDisks, g.Wait()
@@ -773,7 +771,7 @@ func fixFormatErasureV3(storageDisks []StorageAPI, endpoints Endpoints, formats
 			}
 			if formats[i].Erasure.This == "" {
 				formats[i].Erasure.This = formats[i].Erasure.Sets[0][i]
-				if err := saveFormatErasure(storageDisks[i], formats[i], formats[i].Erasure.This); err != nil {
+				if err := saveFormatErasure(storageDisks[i], formats[i]); err != nil {
 					return err
 				}
 			}
@@ -790,7 +788,7 @@ func fixFormatErasureV3(storageDisks []StorageAPI, endpoints Endpoints, formats
 }
 
 // initFormatErasure - save Erasure format configuration on all disks.
-func initFormatErasure(ctx context.Context, storageDisks []StorageAPI, setCount, drivesPerSet int, deploymentID string) (*formatErasureV3, error) {
+func initFormatErasure(ctx context.Context, storageDisks []StorageAPI, setCount, drivesPerSet int, deploymentID string, sErrs []error) (*formatErasureV3, error) {
 	format := newFormatErasureV3(setCount, drivesPerSet)
 	formats := make([]*formatErasureV3, len(storageDisks))
 	wantAtMost := ecDrivesNoConfig(drivesPerSet)
@@ -831,6 +829,9 @@ func initFormatErasure(ctx context.Context, storageDisks []StorageAPI, setCount,
 		}
 	}
 
+	// Mark all root disks down
+	markRootDisksAsDown(storageDisks, sErrs)
+
 	// Save formats `format.json` across all disks.
 	if err := saveFormatErasureAll(ctx, storageDisks, formats); err != nil {
 		return nil, err

cmd/prepare-storage.go

@@ -278,7 +278,7 @@ func connectLoadInitFormats(retryCount int, firstDisk bool, endpoints Endpoints,
 			humanize.Ordinal(zoneCount), setCount, drivesPerSet)
 
 		// Initialize erasure code format on disks
-		format, err = initFormatErasure(GlobalContext, storageDisks, setCount, drivesPerSet, deploymentID)
+		format, err = initFormatErasure(GlobalContext, storageDisks, setCount, drivesPerSet, deploymentID, sErrs)
 		if err != nil {
 			return nil, nil, err
 		}
@@ -301,6 +301,9 @@ func connectLoadInitFormats(retryCount int, firstDisk bool, endpoints Endpoints,
 		return nil, nil, errFirstDiskWait
 	}
 
+	// Mark all root disks down
+	markRootDisksAsDown(storageDisks, sErrs)
+
 	// Following function is added to fix a regressions which was introduced
 	// in release RELEASE.2018-03-16T22-52-12Z after migrating v1 to v2 to v3.
 	// This migration failed to capture '.This' field properly which indicates

cmd/storage-interface.go

@@ -29,6 +29,7 @@ type StorageAPI interface {
 	// Storage operations.
 	IsOnline() bool // Returns true if disk is online.
 	IsLocal() bool
+
 	Hostname() string // Returns host name if remote host.
 	Close() error
 	GetDiskID() (string, error)

cmd/xl-storage.go

@@ -45,7 +45,6 @@ import (
 	"github.com/minio/minio/pkg/disk"
 	"github.com/minio/minio/pkg/env"
 	xioutil "github.com/minio/minio/pkg/ioutil"
-	"github.com/minio/minio/pkg/mountinfo"
 )
 
 const (
@@ -97,7 +96,7 @@ type xlStorage struct {
 
 	globalSync bool
 
-	diskMount bool // indicates if the path is an actual mount.
+	rootDisk bool
 
 	diskID string
 
@@ -240,6 +239,11 @@ func newXLStorage(path string, hostname string) (*xlStorage, error) {
 		return nil, err
 	}
 
+	rootDisk, err := disk.IsRootDisk(path)
+	if err != nil {
+		return nil, err
+	}
+
 	p := &xlStorage{
 		diskPath: path,
 		hostname: hostname,
@@ -250,13 +254,13 @@ func newXLStorage(path string, hostname string) (*xlStorage, error) {
 			},
 		},
 		globalSync: env.Get(config.EnvFSOSync, config.EnableOff) == config.EnableOn,
-		diskMount:  mountinfo.IsLikelyMountPoint(path),
 		// Allow disk usage crawler to run with up to 2 concurrent
 		// I/O ops, if and when activeIOCount reaches this
 		// value disk usage routine suspends the crawler
 		// and waits until activeIOCount reaches below this threshold.
 		maxActiveIOCount: 3,
 		ctx:              GlobalContext,
+		rootDisk:         rootDisk,
 	}
 
 	// Success.
@@ -412,16 +416,11 @@ func (s *xlStorage) DiskInfo() (info DiskInfo, err error) {
 		return info, err
 	}
 
-	rootDisk, err := disk.IsRootDisk(s.diskPath)
-	if err != nil {
-		return info, err
-	}
-
 	info = DiskInfo{
 		Total:     di.Total,
 		Free:      di.Free,
 		Used:      di.Total - di.Free,
-		RootDisk:  rootDisk,
+		RootDisk:  s.rootDisk,
 		MountPath: s.diskPath,
 	}
 

pkg/disk/root_disk_unix.go

@@ -31,18 +31,32 @@ func IsRootDisk(diskPath string) (bool, error) {
 	if err != nil {
 		return false, err
 	}
-	rootInfo, err := os.Stat("/etc/hosts")
+	rootHostsInfo, err := os.Stat("/etc/hosts")
+	if err != nil {
+		return false, err
+	}
+	rootInfo, err := os.Stat("/")
 	if err != nil {
 		return false, err
 	}
 	diskStat, diskStatOK := diskInfo.Sys().(*syscall.Stat_t)
+	rootHostsStat, rootHostsStatOK := rootHostsInfo.Sys().(*syscall.Stat_t)
 	rootStat, rootStatOK := rootInfo.Sys().(*syscall.Stat_t)
-	if diskStatOK && rootStatOK {
-		if diskStat.Dev == rootStat.Dev {
+	if diskStatOK && rootHostsStatOK {
+		if diskStat.Dev == rootHostsStat.Dev {
 			// Indicate if the disk path is on root disk. This is used to indicate the healing
 			// process not to format the drive and end up healing it.
 			rootDisk = true
 		}
 	}
+	if !rootDisk {
+		if diskStatOK && rootStatOK {
+			if diskStat.Dev == rootStat.Dev {
+				// Indicate if the disk path is on root disk. This is used to indicate the healing
+				// process not to format the drive and end up healing it.
+				rootDisk = true
+			}
+		}
+	}
 	return rootDisk, nil
 }

pkg/madmin/info-commands.go

@@ -270,6 +270,7 @@ type ServerProperties struct {
 // Disk holds Disk information
 type Disk struct {
 	Endpoint        string  `json:"endpoint,omitempty"`
+	RootDisk        bool    `json:"rootDisk,omitempty"`
 	DrivePath       string  `json:"path,omitempty"`
 	State           string  `json:"state,omitempty"`
 	UUID            string  `json:"uuid,omitempty"`