// adds a block to persistent store as the last block of inodeid,
// setting its blockid to the generated ID, and returning the generated ID and error
func (nd *NameData) AddBlock(b maggiefs.Block, inodeid uint64) (uint64, error) {
newBlockId, err := nd.GetIncrCounter(COUNTER_BLOCK, 1)
b.Id = newBlockId
_, err = nd.Mutate(inodeid, func(i *maggiefs.Inode) error {
i.Blocks = append(i.Blocks, b)
return nil
})
if err != nil {
return 0, err
}
return b.Id, nil
}
func (ns *NameServer) AddBlock(nodeid uint64, length uint32) (newBlock maggiefs.Block, err error) {
i, err := ns.nd.GetInode(nodeid)
if err != nil {
return maggiefs.Block{}, nil
}
// check which hosts we want
vols, err := ns.rm.volumesForNewBlock(nil)
if err != nil {
return maggiefs.Block{}, err
}
volIds := make([]uint32, len(vols))
for idx, v := range vols {
volIds[idx] = v.VolId
}
var startPos uint64 = 0
if len(i.Blocks) > 0 {
lastBlock := i.Blocks[len(i.Blocks)-1]
startPos = lastBlock.EndPos + 1
} else {
startPos = 0
}
endPos := startPos + uint64(length) - 1
// allocate block and id
b := maggiefs.Block{
Id: 0,
Inodeid: i.Inodeid,
Version: 0,
StartPos: startPos,
EndPos: endPos,
Volumes: volIds,
}
newId, err := ns.nd.AddBlock(b, i.Inodeid)
b.Id = newId
//fmt.Printf("nameserver addblock returning new block %+v\n",b)
if err != nil {
return maggiefs.Block{}, err
}
// replicate block to datanodes
err = ns.rm.AddBlock(b)
return b, err
}