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50 lines
1.4 KiB
50 lines
1.4 KiB
package storage
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import (
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"fmt"
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"os"
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"github.com/chrislusf/seaweedfs/weed/util/log"
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"github.com/chrislusf/seaweedfs/weed/storage/backend"
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"github.com/chrislusf/seaweedfs/weed/storage/needle"
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"github.com/chrislusf/seaweedfs/weed/storage/super_block"
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)
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func (v *Volume) maybeWriteSuperBlock() error {
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datSize, _, e := v.DataBackend.GetStat()
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if e != nil {
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log.Infof("failed to stat datafile %s: %v", v.DataBackend.Name(), e)
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return e
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}
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if datSize == 0 {
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v.SuperBlock.Version = needle.CurrentVersion
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_, e = v.DataBackend.WriteAt(v.SuperBlock.Bytes(), 0)
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if e != nil && os.IsPermission(e) {
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//read-only, but zero length - recreate it!
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var dataFile *os.File
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if dataFile, e = os.Create(v.DataBackend.Name()); e == nil {
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v.DataBackend = backend.NewDiskFile(dataFile)
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if _, e = v.DataBackend.WriteAt(v.SuperBlock.Bytes(), 0); e == nil {
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v.noWriteLock.Lock()
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v.noWriteOrDelete = false
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v.noWriteCanDelete = false
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v.noWriteLock.Unlock()
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}
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}
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}
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}
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return e
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}
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func (v *Volume) readSuperBlock() (err error) {
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v.SuperBlock, err = super_block.ReadSuperBlock(v.DataBackend)
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if v.volumeInfo != nil && v.volumeInfo.Replication != "" {
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if replication, err := super_block.NewReplicaPlacementFromString(v.volumeInfo.Replication); err != nil {
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return fmt.Errorf("Error parse volume %d replication %s : %v", v.Id, v.volumeInfo.Replication, err)
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} else {
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v.SuperBlock.ReplicaPlacement = replication
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}
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}
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return err
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}
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