main, fusefrontend: add "-noprealloc" option

Preallocation is very slow on hdds that run btrfs. Give the
user the option to disable it. This greatly speeds up small file
operations but reduces the robustness against out-of-space errors.

Also add the option to the man page.

More info: https://github.com/rfjakob/gocryptfs/issues/63

1 files changed, 1 insertions, 0 deletions

diff --git a/mount.go b/mount.go
index 3bafd8c..29d34b8 100644
--- a/mount.go
+++ b/mount.go
@@ -145,6 +145,7 @@ func initFuseFrontend(key []byte, args *argContainer, confFile *configfile.ConfF
 		CryptoBackend:  cryptoBackend,
 		ConfigCustom:   args._configCustom,
 		Raw64:          args.raw64,
+		NoPrealloc:     args.noprealloc,
 	}
 	// confFile is nil when "-zerokey" or "-masterkey" was used
 	if confFile != nil {