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overwrite optimization for dagmodifier

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This commit is contained in:
Jeromy
2015-03-10 00:31:06 -07:00
parent 370285fcfa
commit 5ead2a9fab
2 changed files with 8 additions and 2 deletions
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9
unixfs/mod/dagmodifier.go
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@ -63,7 +63,12 @@ func (dm *DagModifier) WriteAt(b []byte, offset int64) (int, error) {
// TODO: this is currently VERY inneficient
// each write that happens at an offset other than the current one causes a
// flush to disk, and dag rewrite
if uint64(offset) != dm.curWrOff {
if offset == int64(dm.writeStart) && dm.wrBuf != nil {
// If we would overwrite the previous write
if len(b) >= dm.wrBuf.Len() {
dm.wrBuf.Reset()
}
} else if uint64(offset) != dm.curWrOff {
size, err := dm.Size()
if err != nil {
return 0, err
@ -242,6 +247,7 @@ func (dm *DagModifier) modifyDag(node *mdag.Node, offset uint64, data io.Reader)
var cur uint64
var done bool
for i, bs := range f.GetBlocksizes() {
// We found the correct child to write into
if cur+bs > offset {
child, err := node.Links[i].GetNode(dm.dagserv)
if err != nil {
@ -256,6 +262,7 @@ func (dm *DagModifier) modifyDag(node *mdag.Node, offset uint64, data io.Reader)
node.Links[i].Hash = mh.Multihash(k)
if sdone {
// No more bytes to write!
done = true
break
}