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Add available space to devicemapper status output

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Signed-off-by: Peter Volpe <petervo@redhat.com>
This commit is contained in:
Peter Volpe 2015-01-30 22:21:34 -08:00
parent fb55c0ecc6
commit 726f89d77a
3 changed files with 47 additions and 2 deletions
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4
daemon/graphdriver/devmapper/README.md
View file

@ -42,8 +42,10 @@ will display something like:
Metadata file: /dev/loop4
Data Space Used: 2.536 GB
Data Space Total: 107.4 GB
Data Space Available: 104.8 GB
Metadata Space Used: 7.93 MB
Metadata Space Total: 2.147 GB
Metadata Space Available: 2.14 GB
Udev Sync Supported: true
Data loop file: /home/docker/devicemapper/devicemapper/data
Metadata loop file: /home/docker/devicemapper/devicemapper/metadata
@ -60,8 +62,10 @@ status information about the driver.
* `Metadata file` blockdevice file used for the devicemapper metadata
* `Data Space Used` tells how much of `Data file` is currently used
* `Data Space Total` tells max size the `Data file`
* `Data Space Available` tells how much free space there is in the `Data file`
* `Metadata Space Used` tells how much of `Metadata file` is currently used
* `Metadata Space Total` tells max size the `Metadata file`
* `Metadata Space Available` tells how much free space there is in the `Metadata file`
* `Udev Sync Supported` tells whether devicemapper is able to sync with Udev. Should be `true`.
* `Data loop file` file attached to `Data file`, if loopback device is used
* `Metadata loop file` file attached to `Metadata file`, if loopback device is used

43
daemon/graphdriver/devmapper/deviceset.go
View file

@ -100,8 +100,9 @@ type DeviceSet struct {
}
type DiskUsage struct {
Used uint64
Total uint64
Used uint64
Total uint64
Available uint64
}
type Status struct {
@ -1574,6 +1575,28 @@ func (devices *DeviceSet) MetadataDevicePath() string {
return devices.metadataDevice
}
func (devices *DeviceSet) getUnderlyingAvailableSpace(loopFile string) (uint64, error) {
buf := new(syscall.Statfs_t)
err := syscall.Statfs(loopFile, buf)
if err != nil {
log.Warnf("Warning: Couldn't stat loopfile filesystem %v: %v", loopFile, err)
return 0, err
}
return buf.Bfree * uint64(buf.Bsize), nil
}
func (devices *DeviceSet) isRealFile(loopFile string) (bool, error) {
if loopFile != "" {
fi, err := os.Stat(loopFile)
if err != nil {
log.Warnf("Warning: Couldn't stat loopfile %v: %v", loopFile, err)
return false, err
}
return fi.Mode().IsRegular(), nil
}
return false, nil
}
// Status returns the current status of this deviceset
func (devices *DeviceSet) Status() *Status {
devices.Lock()
@ -1595,12 +1618,28 @@ func (devices *DeviceSet) Status() *Status {
status.Data.Used = dataUsed * blockSizeInSectors * 512
status.Data.Total = dataTotal * blockSizeInSectors * 512
status.Data.Available = status.Data.Total - status.Data.Used
// metadata blocks are always 4k
status.Metadata.Used = metadataUsed * 4096
status.Metadata.Total = metadataTotal * 4096
status.Metadata.Available = status.Metadata.Total - status.Metadata.Used
status.SectorSize = blockSizeInSectors * 512
if check, _ := devices.isRealFile(devices.dataLoopFile); check {
actualSpace, err := devices.getUnderlyingAvailableSpace(devices.dataLoopFile)
if err == nil && actualSpace < status.Data.Available {
status.Data.Available = actualSpace
}
}
if check, _ := devices.isRealFile(devices.metadataLoopFile); check {
actualSpace, err := devices.getUnderlyingAvailableSpace(devices.metadataLoopFile)
if err == nil && actualSpace < status.Metadata.Available {
status.Metadata.Available = actualSpace
}
}
}
return status

2
daemon/graphdriver/devmapper/driver.go
View file

@ -72,8 +72,10 @@ func (d *Driver) Status() [][2]string {
{"Metadata file", s.MetadataFile},
{"Data Space Used", fmt.Sprintf("%s", units.HumanSize(float64(s.Data.Used)))},
{"Data Space Total", fmt.Sprintf("%s", units.HumanSize(float64(s.Data.Total)))},
{"Data Space Available", fmt.Sprintf("%s", units.HumanSize(float64(s.Data.Available)))},
{"Metadata Space Used", fmt.Sprintf("%s", units.HumanSize(float64(s.Metadata.Used)))},
{"Metadata Space Total", fmt.Sprintf("%s", units.HumanSize(float64(s.Metadata.Total)))},
{"Metadata Space Available", fmt.Sprintf("%s", units.HumanSize(float64(s.Metadata.Available)))},
{"Udev Sync Supported", fmt.Sprintf("%v", s.UdevSyncSupported)},
}
if len(s.DataLoopback) > 0 {