Vendor update goleveldb

There are number of changes which went in recently which should improve
performance: https://github.com/syndtr/goleveldb/issues/226#issuecomment-477568827

vendor/github.com/syndtr/goleveldb/.travis.yml

@@ -1,13 +1,12 @@
 language: go
 
 go:
-  - 1.5
-  - 1.6
-  - 1.7
-  - 1.8
-  - 1.9
+  - 1.9.x
+  - 1.10.x
+  - 1.11.x
   - tip
 
 script:
+  - go vet ./...
   - go test -timeout 1h ./...
   - go test -timeout 30m -race -run "TestDB_(Concurrent|GoleveldbIssue74)" ./leveldb

vendor/github.com/syndtr/goleveldb/go.mod

@@ -0,0 +1,7 @@
+module github.com/syndtr/goleveldb
+
+require (
+	github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db // indirect
+	github.com/onsi/ginkgo v1.7.0 // indirect
+	github.com/onsi/gomega v1.4.3 // indirect
+)

vendor/github.com/syndtr/goleveldb/go.sum

@@ -0,0 +1,25 @@
+github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
+github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db h1:woRePGFeVFfLKN/pOkfl+p/TAqKOfFu+7KPlMVpok/w=
+github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
+github.com/hpcloud/tail v1.0.0 h1:nfCOvKYfkgYP8hkirhJocXT2+zOD8yUNjXaWfTlyFKI=
+github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
+github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
+github.com/onsi/ginkgo v1.7.0 h1:WSHQ+IS43OoUrWtD1/bbclrwK8TTH5hzp+umCiuxHgs=
+github.com/onsi/ginkgo v1.7.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
+github.com/onsi/gomega v1.4.3 h1:RE1xgDvH7imwFD45h+u2SgIfERHlS2yNG4DObb5BSKU=
+github.com/onsi/gomega v1.4.3/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
+golang.org/x/net v0.0.0-20180906233101-161cd47e91fd h1:nTDtHvHSdCn1m6ITfMRqtOd/9+7a3s8RBNOZ3eYZzJA=
+golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e h1:o3PsSEY8E4eXWkXrIP9YJALUkVZqzHJT5DOasTyn8Vs=
+golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/yaml.v2 v2.2.1 h1:mUhvW9EsL+naU5Q3cakzfE91YhliOondGd6ZrsDBHQE=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

vendor/github.com/syndtr/goleveldb/leveldb/cache/cache.go

@@ -331,7 +331,6 @@ func (r *Cache) delete(n *Node) bool {
 			return deleted
 		}
 	}
-	return false
 }
 
 // Nodes returns number of 'cache node' in the map.

vendor/github.com/syndtr/goleveldb/leveldb/comparer/bytes_comparer.go

@@ -29,7 +29,7 @@ func (bytesComparer) Separator(dst, a, b []byte) []byte {
 		// Do not shorten if one string is a prefix of the other
 	} else if c := a[i]; c < 0xff && c+1 < b[i] {
 		dst = append(dst, a[:i+1]...)
-		dst[i]++
+		dst[len(dst)-1]++
 		return dst
 	}
 	return nil
@@ -39,7 +39,7 @@ func (bytesComparer) Successor(dst, b []byte) []byte {
 	for i, c := range b {
 		if c != 0xff {
 			dst = append(dst, b[:i+1]...)
-			dst[i]++
+			dst[len(dst)-1]++
 			return dst
 		}
 	}

vendor/github.com/syndtr/goleveldb/leveldb/comparer/comparer.go

@@ -36,7 +36,7 @@ type Comparer interface {
 	// by any users of this package.
 	Name() string
 
-	// Bellow are advanced functions used used to reduce the space requirements
+	// Bellow are advanced functions used to reduce the space requirements
 	// for internal data structures such as index blocks.
 
 	// Separator appends a sequence of bytes x to dst such that a <= x && x < b,

vendor/github.com/syndtr/goleveldb/leveldb/db.go

@@ -35,6 +35,7 @@ type DB struct {
 	// Stats. Need 64-bit alignment.
 	cWriteDelay            int64 // The cumulative duration of write delays
 	cWriteDelayN           int32 // The cumulative number of write delays
+	inWritePaused          int32 // The indicator whether write operation is paused by compaction
 	aliveSnaps, aliveIters int32
 
 	// Session.
@@ -181,7 +182,7 @@ func Open(stor storage.Storage, o *opt.Options) (db *DB, err error) {
 
 	err = s.recover()
 	if err != nil {
-		if !os.IsNotExist(err) || s.o.GetErrorIfMissing() {
+		if !os.IsNotExist(err) || s.o.GetErrorIfMissing() || s.o.GetReadOnly() {
 			return
 		}
 		err = s.create()
@@ -871,6 +872,10 @@ func (db *DB) Has(key []byte, ro *opt.ReadOptions) (ret bool, err error) {
 // DB. And a nil Range.Limit is treated as a key after all keys in
 // the DB.
 //
+// WARNING: Any slice returned by interator (e.g. slice returned by calling
+// Iterator.Key() or Iterator.Key() methods), its content should not be modified
+// unless noted otherwise.
+//
 // The iterator must be released after use, by calling Release method.
 //
 // Also read Iterator documentation of the leveldb/iterator package.
@@ -967,7 +972,8 @@ func (db *DB) GetProperty(name string) (value string, err error) {
 			float64(db.s.stor.writes())/1048576.0)
 	case p == "writedelay":
 		writeDelayN, writeDelay := atomic.LoadInt32(&db.cWriteDelayN), time.Duration(atomic.LoadInt64(&db.cWriteDelay))
-		value = fmt.Sprintf("DelayN:%d Delay:%s", writeDelayN, writeDelay)
+		paused := atomic.LoadInt32(&db.inWritePaused) == 1
+		value = fmt.Sprintf("DelayN:%d Delay:%s Paused:%t", writeDelayN, writeDelay, paused)
 	case p == "sstables":
 		for level, tables := range v.levels {
 			value += fmt.Sprintf("--- level %d ---\n", level)
@@ -996,6 +1002,75 @@ func (db *DB) GetProperty(name string) (value string, err error) {
 	return
 }
 
+// DBStats is database statistics.
+type DBStats struct {
+	WriteDelayCount    int32
+	WriteDelayDuration time.Duration
+	WritePaused        bool
+
+	AliveSnapshots int32
+	AliveIterators int32
+
+	IOWrite uint64
+	IORead  uint64
+
+	BlockCacheSize    int
+	OpenedTablesCount int
+
+	LevelSizes        []int64
+	LevelTablesCounts []int
+	LevelRead         []int64
+	LevelWrite        []int64
+	LevelDurations    []time.Duration
+}
+
+// Stats populates s with database statistics.
+func (db *DB) Stats(s *DBStats) error {
+	err := db.ok()
+	if err != nil {
+		return err
+	}
+
+	s.IORead = db.s.stor.reads()
+	s.IOWrite = db.s.stor.writes()
+	s.WriteDelayCount = atomic.LoadInt32(&db.cWriteDelayN)
+	s.WriteDelayDuration = time.Duration(atomic.LoadInt64(&db.cWriteDelay))
+	s.WritePaused = atomic.LoadInt32(&db.inWritePaused) == 1
+
+	s.OpenedTablesCount = db.s.tops.cache.Size()
+	if db.s.tops.bcache != nil {
+		s.BlockCacheSize = db.s.tops.bcache.Size()
+	} else {
+		s.BlockCacheSize = 0
+	}
+
+	s.AliveIterators = atomic.LoadInt32(&db.aliveIters)
+	s.AliveSnapshots = atomic.LoadInt32(&db.aliveSnaps)
+
+	s.LevelDurations = s.LevelDurations[:0]
+	s.LevelRead = s.LevelRead[:0]
+	s.LevelWrite = s.LevelWrite[:0]
+	s.LevelSizes = s.LevelSizes[:0]
+	s.LevelTablesCounts = s.LevelTablesCounts[:0]
+
+	v := db.s.version()
+	defer v.release()
+
+	for level, tables := range v.levels {
+		duration, read, write := db.compStats.getStat(level)
+		if len(tables) == 0 && duration == 0 {
+			continue
+		}
+		s.LevelDurations = append(s.LevelDurations, duration)
+		s.LevelRead = append(s.LevelRead, read)
+		s.LevelWrite = append(s.LevelWrite, write)
+		s.LevelSizes = append(s.LevelSizes, tables.size())
+		s.LevelTablesCounts = append(s.LevelTablesCounts, len(tables))
+	}
+
+	return nil
+}
+
 // SizeOf calculates approximate sizes of the given key ranges.
 // The length of the returned sizes are equal with the length of the given
 // ranges. The returned sizes measure storage space usage, so if the user

vendor/github.com/syndtr/goleveldb/leveldb/db_compaction.go

@@ -640,6 +640,16 @@ func (db *DB) tableNeedCompaction() bool {
 	return v.needCompaction()
 }
 
+// resumeWrite returns an indicator whether we should resume write operation if enough level0 files are compacted.
+func (db *DB) resumeWrite() bool {
+	v := db.s.version()
+	defer v.release()
+	if v.tLen(0) < db.s.o.GetWriteL0PauseTrigger() {
+		return true
+	}
+	return false
+}
+
 func (db *DB) pauseCompaction(ch chan<- struct{}) {
 	select {
 	case ch <- struct{}{}:
@@ -653,6 +663,7 @@ type cCmd interface {
 }
 
 type cAuto struct {
+	// Note for table compaction, an non-empty ackC represents it's a compaction waiting command.
 	ackC chan<- error
 }
 
@@ -765,8 +776,10 @@ func (db *DB) mCompaction() {
 }
 
 func (db *DB) tCompaction() {
-	var x cCmd
-	var ackQ []cCmd
+	var (
+		x     cCmd
+		waitQ []cCmd
+	)
 
 	defer func() {
 		if x := recover(); x != nil {
@@ -774,9 +787,9 @@ func (db *DB) tCompaction() {
 				panic(x)
 			}
 		}
-		for i := range ackQ {
-			ackQ[i].ack(ErrClosed)
-			ackQ[i] = nil
+		for i := range waitQ {
+			waitQ[i].ack(ErrClosed)
+			waitQ[i] = nil
 		}
 		if x != nil {
 			x.ack(ErrClosed)
@@ -795,12 +808,20 @@ func (db *DB) tCompaction() {
 				return
 			default:
 			}
-		} else {
-			for i := range ackQ {
-				ackQ[i].ack(nil)
-				ackQ[i] = nil
+			// Resume write operation as soon as possible.
+			if len(waitQ) > 0 && db.resumeWrite() {
+				for i := range waitQ {
+					waitQ[i].ack(nil)
+					waitQ[i] = nil
+				}
+				waitQ = waitQ[:0]
 			}
-			ackQ = ackQ[:0]
+		} else {
+			for i := range waitQ {
+				waitQ[i].ack(nil)
+				waitQ[i] = nil
+			}
+			waitQ = waitQ[:0]
 			select {
 			case x = <-db.tcompCmdC:
 			case ch := <-db.tcompPauseC:
@@ -813,7 +834,14 @@ func (db *DB) tCompaction() {
 		if x != nil {
 			switch cmd := x.(type) {
 			case cAuto:
-				ackQ = append(ackQ, x)
+				if cmd.ackC != nil {
+					// Check the write pause state before caching it.
+					if db.resumeWrite() {
+						x.ack(nil)
+					} else {
+						waitQ = append(waitQ, x)
+					}
+				}
 			case cRange:
 				x.ack(db.tableRangeCompaction(cmd.level, cmd.min, cmd.max))
 			default:

vendor/github.com/syndtr/goleveldb/leveldb/db_snapshot.go

@@ -142,6 +142,10 @@ func (snap *Snapshot) Has(key []byte, ro *opt.ReadOptions) (ret bool, err error)
 // DB. And a nil Range.Limit is treated as a key after all keys in
 // the DB.
 //
+// WARNING: Any slice returned by interator (e.g. slice returned by calling
+// Iterator.Key() or Iterator.Value() methods), its content should not be
+// modified unless noted otherwise.
+//
 // The iterator must be released after use, by calling Release method.
 // Releasing the snapshot doesn't mean releasing the iterator too, the
 // iterator would be still valid until released.

vendor/github.com/syndtr/goleveldb/leveldb/db_test.go

@@ -431,7 +431,7 @@ func (h *dbHarness) compactRange(min, max string) {
 
 func (h *dbHarness) sizeOf(start, limit string) int64 {
 	sz, err := h.db.SizeOf([]util.Range{
-		{[]byte(start), []byte(limit)},
+		{Start: []byte(start), Limit: []byte(limit)},
 	})
 	if err != nil {
 		h.t.Error("SizeOf: got error: ", err)
@@ -1592,7 +1592,7 @@ func TestDB_ClosedIsClosed(t *testing.T) {
 	_, err = db.GetProperty("leveldb.stats")
 	assertErr(t, err, true)
 
-	_, err = db.SizeOf([]util.Range{{[]byte("a"), []byte("z")}})
+	_, err = db.SizeOf([]util.Range{{Start: []byte("a"), Limit: []byte("z")}})
 	assertErr(t, err, true)
 
 	assertErr(t, db.CompactRange(util.Range{}), true)

vendor/github.com/syndtr/goleveldb/leveldb/db_transaction.go

@@ -69,6 +69,10 @@ func (tr *Transaction) Has(key []byte, ro *opt.ReadOptions) (bool, error) {
 // DB. And a nil Range.Limit is treated as a key after all keys in
 // the DB.
 //
+// WARNING: Any slice returned by interator (e.g. slice returned by calling
+// Iterator.Key() or Iterator.Key() methods), its content should not be modified
+// unless noted otherwise.
+//
 // The iterator must be released after use, by calling Release method.
 //
 // Also read Iterator documentation of the leveldb/iterator package.

vendor/github.com/syndtr/goleveldb/leveldb/db_util.go

@@ -84,7 +84,7 @@ func (db *DB) checkAndCleanFiles() error {
 		var mfds []storage.FileDesc
 		for num, present := range tmap {
 			if !present {
-				mfds = append(mfds, storage.FileDesc{storage.TypeTable, num})
+				mfds = append(mfds, storage.FileDesc{Type: storage.TypeTable, Num: num})
 				db.logf("db@janitor table missing @%d", num)
 			}
 		}

vendor/github.com/syndtr/goleveldb/leveldb/db_write.go

@@ -89,7 +89,11 @@ func (db *DB) flush(n int) (mdb *memDB, mdbFree int, err error) {
 			return false
 		case tLen >= pauseTrigger:
 			delayed = true
+			// Set the write paused flag explicitly.
+			atomic.StoreInt32(&db.inWritePaused, 1)
 			err = db.compTriggerWait(db.tcompCmdC)
+			// Unset the write paused flag.
+			atomic.StoreInt32(&db.inWritePaused, 0)
 			if err != nil {
 				return false
 			}

vendor/github.com/syndtr/goleveldb/leveldb/iterator/iter.go

@@ -40,11 +40,11 @@ type IteratorSeeker interface {
 	Seek(key []byte) bool
 
 	// Next moves the iterator to the next key/value pair.
-	// It returns whether the iterator is exhausted.
+	// It returns false if the iterator is exhausted.
 	Next() bool
 
 	// Prev moves the iterator to the previous key/value pair.
-	// It returns whether the iterator is exhausted.
+	// It returns false if the iterator is exhausted.
 	Prev() bool
 }
 

vendor/github.com/syndtr/goleveldb/leveldb/memdb/memdb.go

@@ -397,6 +397,10 @@ func (p *DB) Find(key []byte) (rkey, value []byte, err error) {
 // DB. And a nil Range.Limit is treated as a key after all keys in
 // the DB.
 //
+// WARNING: Any slice returned by interator (e.g. slice returned by calling
+// Iterator.Key() or Iterator.Key() methods), its content should not be modified
+// unless noted otherwise.
+//
 // The iterator must be released after use, by calling Release method.
 //
 // Also read Iterator documentation of the leveldb/iterator package.

vendor/github.com/syndtr/goleveldb/leveldb/opt/options.go

@@ -158,6 +158,12 @@ type Options struct {
 	// The default value is 8MiB.
 	BlockCacheCapacity int
 
+	// BlockCacheEvictRemoved allows enable forced-eviction on cached block belonging
+	// to removed 'sorted table'.
+	//
+	// The default if false.
+	BlockCacheEvictRemoved bool
+
 	// BlockRestartInterval is the number of keys between restart points for
 	// delta encoding of keys.
 	//
@@ -384,6 +390,13 @@ func (o *Options) GetBlockCacheCapacity() int {
 	return o.BlockCacheCapacity
 }
 
+func (o *Options) GetBlockCacheEvictRemoved() bool {
+	if o == nil {
+		return false
+	}
+	return o.BlockCacheEvictRemoved
+}
+
 func (o *Options) GetBlockRestartInterval() int {
 	if o == nil || o.BlockRestartInterval <= 0 {
 		return DefaultBlockRestartInterval

vendor/github.com/syndtr/goleveldb/leveldb/session_util.go

@@ -36,7 +36,7 @@ func (s *session) logf(format string, v ...interface{}) { s.stor.Log(fmt.Sprintf
 
 func (s *session) newTemp() storage.FileDesc {
 	num := atomic.AddInt64(&s.stTempFileNum, 1) - 1
-	return storage.FileDesc{storage.TypeTemp, num}
+	return storage.FileDesc{Type: storage.TypeTemp, Num: num}
 }
 
 func (s *session) addFileRef(fd storage.FileDesc, ref int) int {
@@ -190,7 +190,7 @@ func (s *session) recordCommited(rec *sessionRecord) {
 
 // Create a new manifest file; need external synchronization.
 func (s *session) newManifest(rec *sessionRecord, v *version) (err error) {
-	fd := storage.FileDesc{storage.TypeManifest, s.allocFileNum()}
+	fd := storage.FileDesc{Type: storage.TypeManifest, Num: s.allocFileNum()}
 	writer, err := s.stor.Create(fd)
 	if err != nil {
 		return

vendor/github.com/syndtr/goleveldb/leveldb/storage/file_storage.go

@@ -9,10 +9,12 @@ package storage
 import (
 	"errors"
 	"fmt"
+	"io"
 	"io/ioutil"
 	"os"
 	"path/filepath"
 	"runtime"
+	"sort"
 	"strconv"
 	"strings"
 	"sync"
@@ -42,6 +44,30 @@ func (lock *fileStorageLock) Unlock() {
 	}
 }
 
+type int64Slice []int64
+
+func (p int64Slice) Len() int           { return len(p) }
+func (p int64Slice) Less(i, j int) bool { return p[i] < p[j] }
+func (p int64Slice) Swap(i, j int)      { p[i], p[j] = p[j], p[i] }
+
+func writeFileSynced(filename string, data []byte, perm os.FileMode) error {
+	f, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, perm)
+	if err != nil {
+		return err
+	}
+	n, err := f.Write(data)
+	if err == nil && n < len(data) {
+		err = io.ErrShortWrite
+	}
+	if err1 := f.Sync(); err == nil {
+		err = err1
+	}
+	if err1 := f.Close(); err == nil {
+		err = err1
+	}
+	return err
+}
+
 const logSizeThreshold = 1024 * 1024 // 1 MiB
 
 // fileStorage is a file-system backed storage.
@@ -60,7 +86,7 @@ type fileStorage struct {
 	day  int
 }
 
-// OpenFile returns a new filesytem-backed storage implementation with the given
+// OpenFile returns a new filesystem-backed storage implementation with the given
 // path. This also acquire a file lock, so any subsequent attempt to open the
 // same path will fail.
 //
@@ -189,7 +215,8 @@ func (fs *fileStorage) doLog(t time.Time, str string) {
 	// write
 	fs.buf = append(fs.buf, []byte(str)...)
 	fs.buf = append(fs.buf, '\n')
-	fs.logw.Write(fs.buf)
+	n, _ := fs.logw.Write(fs.buf)
+	fs.logSize += int64(n)
 }
 
 func (fs *fileStorage) Log(str string) {
@@ -210,7 +237,46 @@ func (fs *fileStorage) log(str string) {
 	}
 }
 
-func (fs *fileStorage) SetMeta(fd FileDesc) (err error) {
+func (fs *fileStorage) setMeta(fd FileDesc) error {
+	content := fsGenName(fd) + "\n"
+	// Check and backup old CURRENT file.
+	currentPath := filepath.Join(fs.path, "CURRENT")
+	if _, err := os.Stat(currentPath); err == nil {
+		b, err := ioutil.ReadFile(currentPath)
+		if err != nil {
+			fs.log(fmt.Sprintf("backup CURRENT: %v", err))
+			return err
+		}
+		if string(b) == content {
+			// Content not changed, do nothing.
+			return nil
+		}
+		if err := writeFileSynced(currentPath+".bak", b, 0644); err != nil {
+			fs.log(fmt.Sprintf("backup CURRENT: %v", err))
+			return err
+		}
+	} else if !os.IsNotExist(err) {
+		return err
+	}
+	path := fmt.Sprintf("%s.%d", filepath.Join(fs.path, "CURRENT"), fd.Num)
+	if err := writeFileSynced(path, []byte(content), 0644); err != nil {
+		fs.log(fmt.Sprintf("create CURRENT.%d: %v", fd.Num, err))
+		return err
+	}
+	// Replace CURRENT file.
+	if err := rename(path, currentPath); err != nil {
+		fs.log(fmt.Sprintf("rename CURRENT.%d: %v", fd.Num, err))
+		return err
+	}
+	// Sync root directory.
+	if err := syncDir(fs.path); err != nil {
+		fs.log(fmt.Sprintf("syncDir: %v", err))
+		return err
+	}
+	return nil
+}
+
+func (fs *fileStorage) SetMeta(fd FileDesc) error {
 	if !FileDescOk(fd) {
 		return ErrInvalidFile
 	}
@@ -223,44 +289,10 @@ func (fs *fileStorage) SetMeta(fd FileDesc) (err error) {
 	if fs.open < 0 {
 		return ErrClosed
 	}
-	defer func() {
-		if err != nil {
-			fs.log(fmt.Sprintf("CURRENT: %v", err))
-		}
-	}()
-	path := fmt.Sprintf("%s.%d", filepath.Join(fs.path, "CURRENT"), fd.Num)
-	w, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
-	if err != nil {
-		return
-	}
-	_, err = fmt.Fprintln(w, fsGenName(fd))
-	if err != nil {
-		fs.log(fmt.Sprintf("write CURRENT.%d: %v", fd.Num, err))
-		return
-	}
-	if err = w.Sync(); err != nil {
-		fs.log(fmt.Sprintf("flush CURRENT.%d: %v", fd.Num, err))
-		return
-	}
-	if err = w.Close(); err != nil {
-		fs.log(fmt.Sprintf("close CURRENT.%d: %v", fd.Num, err))
-		return
-	}
-	if err != nil {
-		return
-	}
-	if err = rename(path, filepath.Join(fs.path, "CURRENT")); err != nil {
-		fs.log(fmt.Sprintf("rename CURRENT.%d: %v", fd.Num, err))
-		return
-	}
-	// Sync root directory.
-	if err = syncDir(fs.path); err != nil {
-		fs.log(fmt.Sprintf("syncDir: %v", err))
-	}
-	return
+	return fs.setMeta(fd)
 }
 
-func (fs *fileStorage) GetMeta() (fd FileDesc, err error) {
+func (fs *fileStorage) GetMeta() (FileDesc, error) {
 	fs.mu.Lock()
 	defer fs.mu.Unlock()
 	if fs.open < 0 {
@@ -268,7 +300,7 @@ func (fs *fileStorage) GetMeta() (fd FileDesc, err error) {
 	}
 	dir, err := os.Open(fs.path)
 	if err != nil {
-		return
+		return FileDesc{}, err
 	}
 	names, err := dir.Readdirnames(0)
 	// Close the dir first before checking for Readdirnames error.
@@ -276,94 +308,134 @@ func (fs *fileStorage) GetMeta() (fd FileDesc, err error) {
 		fs.log(fmt.Sprintf("close dir: %v", ce))
 	}
 	if err != nil {
-		return
+		return FileDesc{}, err
 	}
-	// Find latest CURRENT file.
-	var rem []string
-	var pend bool
-	var cerr error
+	// Try this in order:
+	// - CURRENT.[0-9]+ ('pending rename' file, descending order)
+	// - CURRENT
+	// - CURRENT.bak
+	//
+	// Skip corrupted file or file that point to a missing target file.
+	type currentFile struct {
+		name string
+		fd   FileDesc
+	}
+	tryCurrent := func(name string) (*currentFile, error) {
+		b, err := ioutil.ReadFile(filepath.Join(fs.path, name))
+		if err != nil {
+			if os.IsNotExist(err) {
+				err = os.ErrNotExist
+			}
+			return nil, err
+		}
+		var fd FileDesc
+		if len(b) < 1 || b[len(b)-1] != '\n' || !fsParseNamePtr(string(b[:len(b)-1]), &fd) {
+			fs.log(fmt.Sprintf("%s: corrupted content: %q", name, b))
+			err := &ErrCorrupted{
+				Err: errors.New("leveldb/storage: corrupted or incomplete CURRENT file"),
+			}
+			return nil, err
+		}
+		if _, err := os.Stat(filepath.Join(fs.path, fsGenName(fd))); err != nil {
+			if os.IsNotExist(err) {
+				fs.log(fmt.Sprintf("%s: missing target file: %s", name, fd))
+				err = os.ErrNotExist
+			}
+			return nil, err
+		}
+		return &currentFile{name: name, fd: fd}, nil
+	}
+	tryCurrents := func(names []string) (*currentFile, error) {
+		var (
+			cur *currentFile
+			// Last corruption error.
+			lastCerr error
+		)
+		for _, name := range names {
+			var err error
+			cur, err = tryCurrent(name)
+			if err == nil {
+				break
+			} else if err == os.ErrNotExist {
+				// Fallback to the next file.
+			} else if isCorrupted(err) {
+				lastCerr = err
+				// Fallback to the next file.
+			} else {
+				// In case the error is due to permission, etc.
+				return nil, err
+			}
+		}
+		if cur == nil {
+			err := os.ErrNotExist
+			if lastCerr != nil {
+				err = lastCerr
+			}
+			return nil, err
+		}
+		return cur, nil
+	}
+
+	// Try 'pending rename' files.
+	var nums []int64
 	for _, name := range names {
-		if strings.HasPrefix(name, "CURRENT") {
-			pend1 := len(name) > 7
-			var pendNum int64
-			// Make sure it is valid name for a CURRENT file, otherwise skip it.
-			if pend1 {
-				if name[7] != '.' || len(name) < 9 {
-					fs.log(fmt.Sprintf("skipping %s: invalid file name", name))
-					continue
-				}
-				var e1 error
-				if pendNum, e1 = strconv.ParseInt(name[8:], 10, 0); e1 != nil {
-					fs.log(fmt.Sprintf("skipping %s: invalid file num: %v", name, e1))
-					continue
-				}
+		if strings.HasPrefix(name, "CURRENT.") && name != "CURRENT.bak" {
+			i, err := strconv.ParseInt(name[8:], 10, 64)
+			if err == nil {
+				nums = append(nums, i)
 			}
-			path := filepath.Join(fs.path, name)
-			r, e1 := os.OpenFile(path, os.O_RDONLY, 0)
-			if e1 != nil {
-				return FileDesc{}, e1
-			}
-			b, e1 := ioutil.ReadAll(r)
-			if e1 != nil {
-				r.Close()
-				return FileDesc{}, e1
-			}
-			var fd1 FileDesc
-			if len(b) < 1 || b[len(b)-1] != '\n' || !fsParseNamePtr(string(b[:len(b)-1]), &fd1) {
-				fs.log(fmt.Sprintf("skipping %s: corrupted or incomplete", name))
-				if pend1 {
-					rem = append(rem, name)
-				}
-				if !pend1 || cerr == nil {
-					metaFd, _ := fsParseName(name)
-					cerr = &ErrCorrupted{
-						Fd:  metaFd,
-						Err: errors.New("leveldb/storage: corrupted or incomplete meta file"),
+		}
+	}
+	var (
+		pendCur   *currentFile
+		pendErr   = os.ErrNotExist
+		pendNames []string
+	)
+	if len(nums) > 0 {
+		sort.Sort(sort.Reverse(int64Slice(nums)))
+		pendNames = make([]string, len(nums))
+		for i, num := range nums {
+			pendNames[i] = fmt.Sprintf("CURRENT.%d", num)
+		}
+		pendCur, pendErr = tryCurrents(pendNames)
+		if pendErr != nil && pendErr != os.ErrNotExist && !isCorrupted(pendErr) {
+			return FileDesc{}, pendErr
+		}
+	}
+
+	// Try CURRENT and CURRENT.bak.
+	curCur, curErr := tryCurrents([]string{"CURRENT", "CURRENT.bak"})
+	if curErr != nil && curErr != os.ErrNotExist && !isCorrupted(curErr) {
+		return FileDesc{}, curErr
+	}
+
+	// pendCur takes precedence, but guards against obsolete pendCur.
+	if pendCur != nil && (curCur == nil || pendCur.fd.Num > curCur.fd.Num) {
+		curCur = pendCur
+	}
+
+	if curCur != nil {
+		// Restore CURRENT file to proper state.
+		if !fs.readOnly && (curCur.name != "CURRENT" || len(pendNames) != 0) {
+			// Ignore setMeta errors, however don't delete obsolete files if we
+			// catch error.
+			if err := fs.setMeta(curCur.fd); err == nil {
+				// Remove 'pending rename' files.
+				for _, name := range pendNames {
+					if err := os.Remove(filepath.Join(fs.path, name)); err != nil {
+						fs.log(fmt.Sprintf("remove %s: %v", name, err))
 					}
 				}
-			} else if pend1 && pendNum != fd1.Num {
-				fs.log(fmt.Sprintf("skipping %s: inconsistent pending-file num: %d vs %d", name, pendNum, fd1.Num))
-				rem = append(rem, name)
-			} else if fd1.Num < fd.Num {
-				fs.log(fmt.Sprintf("skipping %s: obsolete", name))
-				if pend1 {
-					rem = append(rem, name)
-				}
-			} else {
-				fd = fd1
-				pend = pend1
-			}
-			if err := r.Close(); err != nil {
-				fs.log(fmt.Sprintf("close %s: %v", name, err))
 			}
 		}
+		return curCur.fd, nil
 	}
-	// Don't remove any files if there is no valid CURRENT file.
-	if fd.Zero() {
-		if cerr != nil {
-			err = cerr
-		} else {
-			err = os.ErrNotExist
-		}
-		return
+
+	// Nothing found.
+	if isCorrupted(pendErr) {
+		return FileDesc{}, pendErr
 	}
-	if !fs.readOnly {
-		// Rename pending CURRENT file to an effective CURRENT.
-		if pend {
-			path := fmt.Sprintf("%s.%d", filepath.Join(fs.path, "CURRENT"), fd.Num)
-			if err := rename(path, filepath.Join(fs.path, "CURRENT")); err != nil {
-				fs.log(fmt.Sprintf("CURRENT.%d -> CURRENT: %v", fd.Num, err))
-			}
-		}
-		// Remove obsolete or incomplete pending CURRENT files.
-		for _, name := range rem {
-			path := filepath.Join(fs.path, name)
-			if err := os.Remove(path); err != nil {
-				fs.log(fmt.Sprintf("remove %s: %v", name, err))
-			}
-		}
-	}
-	return
+	return FileDesc{}, curErr
 }
 
 func (fs *fileStorage) List(ft FileType) (fds []FileDesc, err error) {

vendor/github.com/syndtr/goleveldb/leveldb/storage/file_storage_test.go

@@ -8,8 +8,11 @@ package storage
 
 import (
 	"fmt"
+	"io/ioutil"
+	"math/rand"
 	"os"
 	"path/filepath"
+	"strings"
 	"testing"
 )
 
@@ -53,6 +56,15 @@ var invalidCases = []string{
 	"100.lop",
 }
 
+func tempDir(t *testing.T) string {
+	dir, err := ioutil.TempDir("", "goleveldb-")
+	if err != nil {
+		t.Fatal(t)
+	}
+	t.Log("Using temp-dir:", dir)
+	return dir
+}
+
 func TestFileStorage_CreateFileName(t *testing.T) {
 	for _, c := range cases {
 		if name := fsGenName(FileDesc{c.ftype, c.num}); name != c.name {
@@ -61,6 +73,224 @@ func TestFileStorage_CreateFileName(t *testing.T) {
 	}
 }
 
+func TestFileStorage_MetaSetGet(t *testing.T) {
+	temp := tempDir(t)
+	fs, err := OpenFile(temp, false)
+	if err != nil {
+		t.Fatal("OpenFile: got error: ", err)
+	}
+
+	for i := 0; i < 10; i++ {
+		num := rand.Int63()
+		fd := FileDesc{Type: TypeManifest, Num: num}
+		w, err := fs.Create(fd)
+		if err != nil {
+			t.Fatalf("Create(%d): got error: %v", i, err)
+		}
+		w.Write([]byte("TEST"))
+		w.Close()
+		if err := fs.SetMeta(fd); err != nil {
+			t.Fatalf("SetMeta(%d): got error: %v", i, err)
+		}
+		rfd, err := fs.GetMeta()
+		if err != nil {
+			t.Fatalf("GetMeta(%d): got error: %v", i, err)
+		}
+		if fd != rfd {
+			t.Fatalf("Invalid meta (%d): got '%s', want '%s'", i, rfd, fd)
+		}
+	}
+	os.RemoveAll(temp)
+}
+
+func TestFileStorage_Meta(t *testing.T) {
+	type current struct {
+		num      int64
+		backup   bool
+		current  bool
+		manifest bool
+		corrupt  bool
+	}
+	type testCase struct {
+		currents []current
+		notExist bool
+		corrupt  bool
+		expect   int64
+	}
+	cases := []testCase{
+		{
+			currents: []current{
+				{num: 2, backup: true, manifest: true},
+				{num: 1, current: true},
+			},
+			expect: 2,
+		},
+		{
+			currents: []current{
+				{num: 2, backup: true, manifest: true},
+				{num: 1, current: true, manifest: true},
+			},
+			expect: 1,
+		},
+		{
+			currents: []current{
+				{num: 2, manifest: true},
+				{num: 3, manifest: true},
+				{num: 4, current: true, manifest: true},
+			},
+			expect: 4,
+		},
+		{
+			currents: []current{
+				{num: 2, manifest: true},
+				{num: 3, manifest: true},
+				{num: 4, current: true, manifest: true, corrupt: true},
+			},
+			expect: 3,
+		},
+		{
+			currents: []current{
+				{num: 2, manifest: true},
+				{num: 3, manifest: true},
+				{num: 5, current: true, manifest: true, corrupt: true},
+				{num: 4, backup: true, manifest: true},
+			},
+			expect: 4,
+		},
+		{
+			currents: []current{
+				{num: 4, manifest: true},
+				{num: 3, manifest: true},
+				{num: 2, current: true, manifest: true},
+			},
+			expect: 4,
+		},
+		{
+			currents: []current{
+				{num: 4, manifest: true, corrupt: true},
+				{num: 3, manifest: true},
+				{num: 2, current: true, manifest: true},
+			},
+			expect: 3,
+		},
+		{
+			currents: []current{
+				{num: 4, manifest: true, corrupt: true},
+				{num: 3, manifest: true, corrupt: true},
+				{num: 2, current: true, manifest: true},
+			},
+			expect: 2,
+		},
+		{
+			currents: []current{
+				{num: 4},
+				{num: 3, manifest: true},
+				{num: 2, current: true, manifest: true},
+			},
+			expect: 3,
+		},
+		{
+			currents: []current{
+				{num: 4},
+				{num: 3, manifest: true},
+				{num: 6, current: true},
+				{num: 5, backup: true, manifest: true},
+			},
+			expect: 5,
+		},
+		{
+			currents: []current{
+				{num: 4},
+				{num: 3},
+				{num: 6, current: true},
+				{num: 5, backup: true},
+			},
+			notExist: true,
+		},
+		{
+			currents: []current{
+				{num: 4, corrupt: true},
+				{num: 3},
+				{num: 6, current: true},
+				{num: 5, backup: true},
+			},
+			corrupt: true,
+		},
+	}
+	for i, tc := range cases {
+		t.Logf("Test-%d", i)
+		temp := tempDir(t)
+		fs, err := OpenFile(temp, false)
+		if err != nil {
+			t.Fatal("OpenFile: got error: ", err)
+		}
+		for _, cur := range tc.currents {
+			var curName string
+			switch {
+			case cur.current:
+				curName = "CURRENT"
+			case cur.backup:
+				curName = "CURRENT.bak"
+			default:
+				curName = fmt.Sprintf("CURRENT.%d", cur.num)
+			}
+			fd := FileDesc{Type: TypeManifest, Num: cur.num}
+			content := fmt.Sprintf("%s\n", fsGenName(fd))
+			if cur.corrupt {
+				content = content[:len(content)-1-rand.Intn(3)]
+			}
+			if err := ioutil.WriteFile(filepath.Join(temp, curName), []byte(content), 0644); err != nil {
+				t.Fatal(err)
+			}
+			if cur.manifest {
+				w, err := fs.Create(fd)
+				if err != nil {
+					t.Fatal(err)
+				}
+				if _, err := w.Write([]byte("TEST")); err != nil {
+					t.Fatal(err)
+				}
+				w.Close()
+			}
+		}
+		ret, err := fs.GetMeta()
+		if tc.notExist {
+			if err != os.ErrNotExist {
+				t.Fatalf("expect ErrNotExist, got: %v", err)
+			}
+		} else if tc.corrupt {
+			if !isCorrupted(err) {
+				t.Fatalf("expect ErrCorrupted, got: %v", err)
+			}
+		} else {
+			if err != nil {
+				t.Fatal(err)
+			}
+			if ret.Type != TypeManifest {
+				t.Fatalf("expecting manifest, got: %s", ret.Type)
+			}
+			if ret.Num != tc.expect {
+				t.Fatalf("invalid num, expect=%d got=%d", tc.expect, ret.Num)
+			}
+			fis, err := ioutil.ReadDir(temp)
+			if err != nil {
+				t.Fatal(err)
+			}
+			for _, fi := range fis {
+				if strings.HasPrefix(fi.Name(), "CURRENT") {
+					switch fi.Name() {
+					case "CURRENT", "CURRENT.bak":
+					default:
+						t.Fatalf("found rouge CURRENT file: %s", fi.Name())
+					}
+				}
+				t.Logf("-> %s", fi.Name())
+			}
+		}
+		os.RemoveAll(temp)
+	}
+}
+
 func TestFileStorage_ParseFileName(t *testing.T) {
 	for _, c := range cases {
 		for _, name := range append([]string{c.name}, c.oldName...) {
@@ -88,18 +318,15 @@ func TestFileStorage_InvalidFileName(t *testing.T) {
 }
 
 func TestFileStorage_Locking(t *testing.T) {
-	path := filepath.Join(os.TempDir(), fmt.Sprintf("goleveldb-testrwlock-%d", os.Getuid()))
-	if err := os.RemoveAll(path); err != nil && !os.IsNotExist(err) {
-		t.Fatal("RemoveAll: got error: ", err)
-	}
-	defer os.RemoveAll(path)
+	temp := tempDir(t)
+	defer os.RemoveAll(temp)
 
-	p1, err := OpenFile(path, false)
+	p1, err := OpenFile(temp, false)
 	if err != nil {
 		t.Fatal("OpenFile(1): got error: ", err)
 	}
 
-	p2, err := OpenFile(path, false)
+	p2, err := OpenFile(temp, false)
 	if err != nil {
 		t.Logf("OpenFile(2): got error: %s (expected)", err)
 	} else {
@@ -110,7 +337,7 @@ func TestFileStorage_Locking(t *testing.T) {
 
 	p1.Close()
 
-	p3, err := OpenFile(path, false)
+	p3, err := OpenFile(temp, false)
 	if err != nil {
 		t.Fatal("OpenFile(3): got error: ", err)
 	}
@@ -134,18 +361,15 @@ func TestFileStorage_Locking(t *testing.T) {
 }
 
 func TestFileStorage_ReadOnlyLocking(t *testing.T) {
-	path := filepath.Join(os.TempDir(), fmt.Sprintf("goleveldb-testrolock-%d", os.Getuid()))
-	if err := os.RemoveAll(path); err != nil && !os.IsNotExist(err) {
-		t.Fatal("RemoveAll: got error: ", err)
-	}
-	defer os.RemoveAll(path)
+	temp := tempDir(t)
+	defer os.RemoveAll(temp)
 
-	p1, err := OpenFile(path, false)
+	p1, err := OpenFile(temp, false)
 	if err != nil {
 		t.Fatal("OpenFile(1): got error: ", err)
 	}
 
-	_, err = OpenFile(path, true)
+	_, err = OpenFile(temp, true)
 	if err != nil {
 		t.Logf("OpenFile(2): got error: %s (expected)", err)
 	} else {
@@ -154,17 +378,17 @@ func TestFileStorage_ReadOnlyLocking(t *testing.T) {
 
 	p1.Close()
 
-	p3, err := OpenFile(path, true)
+	p3, err := OpenFile(temp, true)
 	if err != nil {
 		t.Fatal("OpenFile(3): got error: ", err)
 	}
 
-	p4, err := OpenFile(path, true)
+	p4, err := OpenFile(temp, true)
 	if err != nil {
 		t.Fatal("OpenFile(4): got error: ", err)
 	}
 
-	_, err = OpenFile(path, false)
+	_, err = OpenFile(temp, false)
 	if err != nil {
 		t.Logf("OpenFile(5): got error: %s (expected)", err)
 	} else {

vendor/github.com/syndtr/goleveldb/leveldb/storage/file_storage_unix.go

@@ -67,13 +67,25 @@ func isErrInvalid(err error) bool {
 	if err == os.ErrInvalid {
 		return true
 	}
+	// Go < 1.8
 	if syserr, ok := err.(*os.SyscallError); ok && syserr.Err == syscall.EINVAL {
 		return true
 	}
+	// Go >= 1.8 returns *os.PathError instead
+	if patherr, ok := err.(*os.PathError); ok && patherr.Err == syscall.EINVAL {
+		return true
+	}
 	return false
 }
 
 func syncDir(name string) error {
+	// As per fsync manpage, Linux seems to expect fsync on directory, however
+	// some system don't support this, so we will ignore syscall.EINVAL.
+	//
+	// From fsync(2):
+	//   Calling fsync() does not necessarily ensure that the entry in the
+	//   directory containing the file has also reached disk. For that an
+	//   explicit fsync() on a file descriptor for the directory is also needed.
 	f, err := os.Open(name)
 	if err != nil {
 		return err

vendor/github.com/syndtr/goleveldb/leveldb/storage/storage.go

@@ -55,6 +55,14 @@ type ErrCorrupted struct {
 	Err error
 }
 
+func isCorrupted(err error) bool {
+	switch err.(type) {
+	case *ErrCorrupted:
+		return true
+	}
+	return false
+}
+
 func (e *ErrCorrupted) Error() string {
 	if !e.Fd.Zero() {
 		return fmt.Sprintf("%v [file=%v]", e.Err, e.Fd)

vendor/github.com/syndtr/goleveldb/leveldb/table.go

@@ -78,7 +78,7 @@ func newTableFile(fd storage.FileDesc, size int64, imin, imax internalKey) *tFil
 }
 
 func tableFileFromRecord(r atRecord) *tFile {
-	return newTableFile(storage.FileDesc{storage.TypeTable, r.num}, r.size, r.imin, r.imax)
+	return newTableFile(storage.FileDesc{Type: storage.TypeTable, Num: r.num}, r.size, r.imin, r.imax)
 }
 
 // tFiles hold multiple tFile.
@@ -290,16 +290,17 @@ func (x *tFilesSortByNum) Less(i, j int) bool {
 
 // Table operations.
 type tOps struct {
-	s      *session
-	noSync bool
-	cache  *cache.Cache
-	bcache *cache.Cache
-	bpool  *util.BufferPool
+	s            *session
+	noSync       bool
+	evictRemoved bool
+	cache        *cache.Cache
+	bcache       *cache.Cache
+	bpool        *util.BufferPool
 }
 
 // Creates an empty table and returns table writer.
 func (t *tOps) create() (*tWriter, error) {
-	fd := storage.FileDesc{storage.TypeTable, t.s.allocFileNum()}
+	fd := storage.FileDesc{Type: storage.TypeTable, Num: t.s.allocFileNum()}
 	fw, err := t.s.stor.Create(fd)
 	if err != nil {
 		return nil, err
@@ -422,7 +423,7 @@ func (t *tOps) remove(f *tFile) {
 		} else {
 			t.s.logf("table@remove removed @%d", f.fd.Num)
 		}
-		if t.bcache != nil {
+		if t.evictRemoved && t.bcache != nil {
 			t.bcache.EvictNS(uint64(f.fd.Num))
 		}
 	})
@@ -451,7 +452,7 @@ func newTableOps(s *session) *tOps {
 	if !s.o.GetDisableBlockCache() {
 		var bcacher cache.Cacher
 		if s.o.GetBlockCacheCapacity() > 0 {
-			bcacher = cache.NewLRU(s.o.GetBlockCacheCapacity())
+			bcacher = s.o.GetBlockCacher().New(s.o.GetBlockCacheCapacity())
 		}
 		bcache = cache.NewCache(bcacher)
 	}
@@ -459,11 +460,12 @@ func newTableOps(s *session) *tOps {
 		bpool = util.NewBufferPool(s.o.GetBlockSize() + 5)
 	}
 	return &tOps{
-		s:      s,
-		noSync: s.o.GetNoSync(),
-		cache:  cache.NewCache(cacher),
-		bcache: bcache,
-		bpool:  bpool,
+		s:            s,
+		noSync:       s.o.GetNoSync(),
+		evictRemoved: s.o.GetBlockCacheEvictRemoved(),
+		cache:        cache.NewCache(cacher),
+		bcache:       bcache,
+		bpool:        bpool,
 	}
 }
 

vendor/github.com/syndtr/goleveldb/leveldb/table/reader.go

@@ -787,6 +787,10 @@ func (r *Reader) getDataIterErr(dataBH blockHandle, slice *util.Range, verifyChe
 // table. And a nil Range.Limit is treated as a key after all keys in
 // the table.
 //
+// WARNING: Any slice returned by interator (e.g. slice returned by calling
+// Iterator.Key() or Iterator.Key() methods), its content should not be modified
+// unless noted otherwise.
+//
 // The returned iterator is not safe for concurrent use and should be released
 // after use.
 //

vendor/github.com/syndtr/goleveldb/leveldb/testutil/storage.go

@@ -147,7 +147,10 @@ func packFile(fd storage.FileDesc) uint64 {
 }
 
 func unpackFile(x uint64) storage.FileDesc {
-	return storage.FileDesc{storage.FileType(x) & storage.TypeAll, int64(x >> typeCount)}
+	return storage.FileDesc{
+		Type: storage.FileType(x) & storage.TypeAll,
+		Num:  int64(x >> typeCount),
+	}
 }
 
 type emulatedError struct {

vendor/github.com/syndtr/goleveldb/leveldb/util.go

@@ -20,7 +20,7 @@ func shorten(str string) string {
 	return str[:3] + ".." + str[len(str)-3:]
 }
 
-var bunits = [...]string{"", "Ki", "Mi", "Gi"}
+var bunits = [...]string{"", "Ki", "Mi", "Gi", "Ti"}
 
 func shortenb(bytes int) string {
 	i := 0

vendor/github.com/syndtr/goleveldb/manualtest/dbstress/main.go

@@ -526,7 +526,7 @@ func main() {
 								getStat.record(1)
 
 								if checksum0, checksum1 := dataChecksum(v2); checksum0 != checksum1 {
-									err := &errors.ErrCorrupted{Fd: storage.FileDesc{0xff, 0}, Err: fmt.Errorf("v2: %x: checksum mismatch: %v vs %v", v2, checksum0, checksum1)}
+									err := &errors.ErrCorrupted{Fd: storage.FileDesc{Type: 0xff, Num: 0}, Err: fmt.Errorf("v2: %x: checksum mismatch: %v vs %v", v2, checksum0, checksum1)}
 									fatalf(err, "[%02d] READER #%d.%d K%d snap.Get: %v\nk1: %x\n -> k2: %x", ns, snapwi, ri, n, err, k1, k2)
 								}