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enable block device size lookup for file backend #13

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enable block device size lookup for file backend #13

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17 changes: 15 additions & 2 deletions nbd/file.go
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Original file line number Diff line number Diff line change
@@ -1,8 +1,10 @@
package nbd

import (
"golang.org/x/net/context"
"io"
"os"

"golang.org/x/net/context"
)

// FileBackend implements Backend
Expand Down Expand Up @@ -79,9 +81,20 @@ func NewFileBackend(ctx context.Context, ec *ExportConfig) (Backend, error) {
file.Close()
return nil, err
}
var size uint64
switch {
case stat.Mode().IsRegular():
size = uint64(stat.Size())
case stat.Mode()&os.ModeDevice != 0:
ds, err := file.Seek(0, io.SeekEnd)
if err != nil {
return nil, err
}
size = uint64(ds)
}
return &FileBackend{
file: file,
size: uint64(stat.Size()),
size: size,
}, nil
}

Expand Down