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40 lines
1.1 KiB
40 lines
1.1 KiB
package storage
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import (
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"os"
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"github.com/chrislusf/seaweedfs/weed/glog"
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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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glog.V(0).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.noWriteOrDelete = false
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v.noWriteCanDelete = false
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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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return err
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}
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