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47 lines
1.4 KiB
Go
Vendored
47 lines
1.4 KiB
Go
Vendored
package diskfs
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import (
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"fmt"
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"os"
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"golang.org/x/sys/unix"
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)
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// this constants should be part of "golang.org/x/sys/unix", but aren't, yet
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const (
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DKIOCGETBLOCKSIZE = 0x40046418
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DKIOCGETPHYSICALBLOCKSIZE = 0x4004644D
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DKIOCGETBLOCKCOUNT = 0x40086419
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)
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// getBlockDeviceSize get the size of an opened block device in Bytes.
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func getBlockDeviceSize(f *os.File) (int64, error) {
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fd := f.Fd()
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blockSize, err := unix.IoctlGetInt(int(fd), DKIOCGETBLOCKSIZE)
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if err != nil {
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return 0, fmt.Errorf("unable to get device logical sector size: %v", err)
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}
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blockCount, err := unix.IoctlGetInt(int(fd), DKIOCGETBLOCKCOUNT)
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if err != nil {
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return 0, fmt.Errorf("unable to get device block count: %v", err)
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}
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return int64(blockSize) * int64(blockCount), nil
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}
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// getSectorSizes get the logical and physical sector sizes for a block device
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func getSectorSizes(f *os.File) (logicalSectorSize, physicalSectorSize int64, err error) {
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fd := f.Fd()
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logicalSectorSizeInt, err := unix.IoctlGetInt(int(fd), DKIOCGETBLOCKSIZE)
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if err != nil {
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return 0, 0, fmt.Errorf("unable to get device logical sector size: %v", err)
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}
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physicalSectorSizeInt, err := unix.IoctlGetInt(int(fd), DKIOCGETPHYSICALBLOCKSIZE)
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if err != nil {
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return 0, 0, fmt.Errorf("unable to get device physical sector size: %v", err)
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}
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return int64(logicalSectorSizeInt), int64(physicalSectorSizeInt), nil
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}
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