From f2b4d57068d13b6dc3de2ccc6550675d11d34cfa Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Fri, 1 Jul 2016 23:29:31 +0200
Subject: fusefrontend: coalesce grows in Truncate()

We were growing the file block-by-block which was pretty
inefficient. We now coalesce all the grows into a single
Ftruncate. Also simplifies the code!

Simplistic benchmark: Before:

  $ time truncate -s 1000M foo
  real	0m0.568s

After:

  $ time truncate -s 1000M foo
  real	0m0.205s
---
 internal/contentenc/offsets.go | 1 +
 1 file changed, 1 insertion(+)

(limited to 'internal/contentenc')

diff --git a/internal/contentenc/offsets.go b/internal/contentenc/offsets.go
index da0551a..256ea26 100644
--- a/internal/contentenc/offsets.go
+++ b/internal/contentenc/offsets.go
@@ -66,6 +66,7 @@ func (be *ContentEnc) PlainSizeToCipherSize(plainSize uint64) uint64 {
 }
 
 // Split a plaintext byte range into (possibly partial) blocks
+// Returns an empty slice if length == 0.
 func (be *ContentEnc) ExplodePlainRange(offset uint64, length uint64) []intraBlock {
 	var blocks []intraBlock
 	var nextBlock intraBlock
-- 
cgit v1.2.3