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Fix disk info race (#11984)

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Protect updated members in xlStorage.

```
WARNING: DATA RACE
Write at 0x00c004b4ee78 by goroutine 1491:
  github.com/minio/minio/cmd.(*xlStorage).GetDiskID()
      d:/minio/minio/cmd/xl-storage.go:590 +0x1078
  github.com/minio/minio/cmd.(*xlStorageDiskIDCheck).checkDiskStale()
      d:/minio/minio/cmd/xl-storage-disk-id-check.go:195 +0x84
  github.com/minio/minio/cmd.(*xlStorageDiskIDCheck).StatVol()
      d:/minio/minio/cmd/xl-storage-disk-id-check.go:284 +0x16a
  github.com/minio/minio/cmd.erasureObjects.getBucketInfo.func1()
      d:/minio/minio/cmd/erasure-bucket.go:100 +0x1a5
  github.com/minio/minio/pkg/sync/errgroup.(*Group).Go.func1()
      d:/minio/minio/pkg/sync/errgroup/errgroup.go:122 +0xd7

Previous read at 0x00c004b4ee78 by goroutine 1087:
  github.com/minio/minio/cmd.(*xlStorage).CheckFile.func1()
      d:/minio/minio/cmd/xl-storage.go:1699 +0x384
  github.com/minio/minio/cmd.(*xlStorage).CheckFile()
      d:/minio/minio/cmd/xl-storage.go:1726 +0x13c
  github.com/minio/minio/cmd.(*xlStorageDiskIDCheck).CheckFile()
      d:/minio/minio/cmd/xl-storage-disk-id-check.go:446 +0x23b
  github.com/minio/minio/cmd.erasureObjects.parentDirIsObject.func1()
      d:/minio/minio/cmd/erasure-common.go:173 +0x194
  github.com/minio/minio/pkg/sync/errgroup.(*Group).Go.func1()
      d:/minio/minio/pkg/sync/errgroup/errgroup.go:122 +0xd7
```
This commit is contained in:
Klaus Post 2021-04-06 20:33:42 +02:00 committed by Harshavardhana
parent f687ba53bc
commit 98c792bbeb
1 changed files with 11 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
cmd/xl-storage.go
View File

@ -347,6 +347,8 @@ func (s *xlStorage) IsLocal() bool {
// Retrieve location indexes. // Retrieve location indexes.
func (s *xlStorage) GetDiskLoc() (poolIdx, setIdx, diskIdx int) { func (s *xlStorage) GetDiskLoc() (poolIdx, setIdx, diskIdx int) {
s.RLock()
defer s.RUnlock()
// If unset, see if we can locate it. // If unset, see if we can locate it.
if s.poolIndex < 0 || s.setIndex < 0 || s.diskIndex < 0 { if s.poolIndex < 0 || s.setIndex < 0 || s.diskIndex < 0 {
return getXLDiskLoc(s.diskID) return getXLDiskLoc(s.diskID)
@ -1615,6 +1617,9 @@ func (s *xlStorage) CheckFile(ctx context.Context, volume string, path string) e
if err != nil { if err != nil {
return err return err
} }
s.RLock()
formatLegacy := s.formatLegacy
s.RUnlock()
var checkFile func(p string) error var checkFile func(p string) error
checkFile = func(p string) error { checkFile = func(p string) error {
@ -1626,10 +1631,10 @@ func (s *xlStorage) CheckFile(ctx context.Context, volume string, path string) e
if err := checkPathLength(filePath); err != nil { if err := checkPathLength(filePath); err != nil {
return err return err
} }
st, _ := Lstat(filePath) st, _ := Lstat(filePath)
if st == nil { if st == nil {
if !s.formatLegacy {
if !formatLegacy {
return errPathNotFound return errPathNotFound
} }
@ -1880,10 +1885,13 @@ func (s *xlStorage) RenameData(ctx context.Context, srcVolume, srcPath, dataDir,
legacyPreserved = true legacyPreserved = true
} }
} else { } else {
s.RLock()
formatLegacy := s.formatLegacy
s.RUnlock()
// It is possible that some drives may not have `xl.meta` file // It is possible that some drives may not have `xl.meta` file
// in such scenarios verify if atleast `part.1` files exist // in such scenarios verify if atleast `part.1` files exist
// to verify for legacy version. // to verify for legacy version.
if s.formatLegacy { if formatLegacy {
// We only need this code if we are moving // We only need this code if we are moving
// from `xl.json` to `xl.meta`, we can avoid // from `xl.json` to `xl.meta`, we can avoid
// one extra readdir operation here for all // one extra readdir operation here for all