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handler_volume.go
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/
handler_volume.go
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//
// Copyright (c) 2014 The heketi Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package glusterfs
import (
"errors"
"github.com/heketi/heketi/requests"
//goon "github.com/shurcooL/go-goon"
"sync"
)
const (
KB = 1
MB = KB * 1024
GB = MB * 1024
TB = GB * 1024
)
var (
// :TODO: Need to add what the maximum number of volumes is
BRICK_MIN_SIZE = uint64(1 * GB)
BRICK_MAX_SIZE = uint64(4 * TB)
BRICK_MAX_NUM = 200
ErrNoSpace = errors.New("No space")
)
// return size of each brick, error
func (m *GlusterFSPlugin) numBricksNeeded(size uint64) (uint64, error) {
brick_size := size / 2
if brick_size < BRICK_MIN_SIZE {
return 0, errors.New("Minimum brick size limit reached. Out of space.")
} else if brick_size > BRICK_MAX_SIZE {
return m.numBricksNeeded(brick_size)
}
return brick_size, nil
}
func (m *GlusterFSPlugin) allocBricks(num_bricks, replicas int, size uint64) ([]*Brick, error) {
bricks := make([]*Brick, 0)
// Allocate size for the brick plus the snapshot
tpsize := uint64(float64(size) * THINP_SNAPSHOT_FACTOR)
for brick_num := 0; brick_num < num_bricks; brick_num++ {
var brick *Brick
brick = NewBrick(size, m.db)
nodelist, err := m.ring.GetNodes(brick_num, brick.Id)
if err != nil {
return nil, err
}
var nodeid, deviceid string
for i := 0; i < replicas; i++ {
if i > 0 {
brick = NewBrick(size, m.db)
}
// This could be a function
for enough_space := false; !enough_space; {
// Could ask for more than just the replicas
if len(nodelist) < 1 {
// unable to satisfy request. Give back the data
for brick := range bricks {
bricks[brick].FreeStorage()
}
return nil, ErrNoSpace
}
var bricknode BrickNode
// Should check list size
bricknode, nodelist = nodelist[0], nodelist[1:len(nodelist)]
m.db.Reader(func() error {
if m.db.nodes[bricknode.NodeId].Info.Devices[bricknode.DeviceId].Free > tpsize {
enough_space = true
nodeid, deviceid = bricknode.NodeId, bricknode.DeviceId
}
return nil
})
}
brick.AllocateStorage(nodeid, deviceid)
// Create a brick object
bricks = append(bricks, brick)
}
}
return bricks, nil
}
func (m *GlusterFSPlugin) createBricks(bricks []*Brick) error {
var wg sync.WaitGroup
for brick := range bricks {
wg.Add(1)
go func(b int) {
defer wg.Done()
bricks[b].Create()
}(brick)
}
wg.Wait()
return nil
}
func (m *GlusterFSPlugin) VolumeCreate(v *requests.VolumeCreateRequest) (*requests.VolumeInfoResp, error) {
// Get the nodes and storage for these bricks
// and Create the bricks
replica := v.Replica
if v.Replica == 0 {
replica = 2
}
var bricklist []*Brick
size := v.Size
for {
// Determine number of bricks needed
brick_size, err := m.numBricksNeeded(size)
if err != nil {
return nil, err
}
num_bricks := int(v.Size / brick_size)
if num_bricks > BRICK_MAX_NUM {
return nil, errors.New("No space. Maximum number of bricks reached.")
}
// Allocate bricks in the cluster
bricklist, err = m.allocBricks(num_bricks, replica, brick_size)
if err == ErrNoSpace {
size /= 2
continue
}
if err != nil {
return nil, err
} else {
break
}
}
// Create bricks
err := m.createBricks(bricklist)
if err != nil {
return nil, err
}
// Create volume object
volume := NewVolumeEntry(v, bricklist, replica, m.db)
err = volume.CreateGlusterVolume()
if err != nil {
return nil, err
}
err = m.db.Writer(func() error {
// Save volume information on the DB
m.db.volumes[volume.Info.Id] = volume
return nil
})
if err != nil {
return nil, err
}
return &volume.Copy().Info, nil
}
func (m *GlusterFSPlugin) VolumeDelete(id string) error {
var volume *VolumeEntry
// Remove from database, then destroy the volume
err := m.db.Writer(func() error {
if v, ok := m.db.volumes[id]; ok {
volume = v
delete(m.db.volumes, id)
} else {
return errors.New("Volume id not found")
}
return nil
})
if err != nil {
return err
}
// Destroy volume
err = volume.Destroy()
if err != nil {
// :TODO: Add back to database with a Zombie state
return err
}
return nil
}
func (m *GlusterFSPlugin) VolumeInfo(id string) (*requests.VolumeInfoResp, error) {
var info *requests.VolumeInfoResp
err := m.db.Reader(func() error {
if volume, ok := m.db.volumes[id]; ok {
info = &volume.Copy().Info
return nil
} else {
return errors.New("Id not found")
}
})
return info, err
}
func (m *GlusterFSPlugin) VolumeResize(id string) (*requests.VolumeInfoResp, error) {
return nil, errors.New("Not supported yet")
}
func (m *GlusterFSPlugin) VolumeList() (*requests.VolumeListResponse, error) {
list := &requests.VolumeListResponse{}
list.Volumes = make([]requests.VolumeInfoResp, 0)
err := m.db.Reader(func() error {
for _, volume := range m.db.volumes {
list.Volumes = append(list.Volumes, volume.Info)
}
return nil
})
if err != nil {
return nil, err
}
return list, nil
}