From c20c7992a06434dd4a9624a57aee608acfc33c12 Mon Sep 17 00:00:00 2001
From: gmd20
Date: Tue, 8 Dec 2020 15:27:23 +0800
Subject: main: add "-kernel_cache" flag

This option is similar to fuse(8) kernel_cache

Verified using vmtouch.

Without -kernel_cache:

$ dd if=/dev/zero of=foo bs=1M count=10 ; vmtouch -t foo ; vmtouch foo
10+0 records in
10+0 records out
10485760 bytes (10 MB, 10 MiB) copied, 0,0242321 s, 433 MB/s
           Files: 1
     Directories: 0
   Touched Pages: 2560 (10M)
         Elapsed: 0.011159 seconds
           Files: 1
     Directories: 0
  Resident Pages: 0/2560  0/10M  0%
         Elapsed: 0.000993 seconds

With -kernel_cache:

$ dd if=/dev/zero of=foo bs=1M count=10 ; vmtouch -t foo ; vmtouch foo
10+0 records in
10+0 records out
10485760 bytes (10 MB, 10 MiB) copied, 0,0244015 s, 430 MB/s
           Files: 1
     Directories: 0
   Touched Pages: 2560 (10M)
         Elapsed: 0.011564 seconds
           Files: 1
     Directories: 0
  Resident Pages: 2560/2560  10M/10M  100%
         Elapsed: 0.000369 seconds
---
 cli_args.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'cli_args.go')

diff --git a/cli_args.go b/cli_args.go
index 11bb96e..8451083 100644
--- a/cli_args.go
+++ b/cli_args.go
@@ -30,7 +30,7 @@ type argContainer struct {
 	noprealloc, speed, hkdf, serialize_reads, forcedecode, hh, info,
 	sharedstorage, devrandom, fsck bool
 	// Mount options with opposites
-	dev, nodev, suid, nosuid, exec, noexec, rw, ro bool
+	dev, nodev, suid, nosuid, exec, noexec, rw, ro, kernel_cache bool
 	masterkey, mountpoint, cipherdir, cpuprofile,
 	memprofile, ko, ctlsock, fsname, force_owner, trace, fido2 string
 	// -extpass, -badname, -passfile can be passed multiple times
@@ -179,6 +179,7 @@ func parseCliOpts() (args argContainer) {
 	flagSet.BoolVar(&args.noexec, "noexec", false, "Deny executables")
 	flagSet.BoolVar(&args.rw, "rw", false, "Mount the filesystem read-write")
 	flagSet.BoolVar(&args.ro, "ro", false, "Mount the filesystem read-only")
+	flagSet.BoolVar(&args.kernel_cache, "kernel_cache", false, "Enable the FUSE kernel_cache option")
 
 	flagSet.StringVar(&args.masterkey, "masterkey", "", "Mount with explicit master key")
 	flagSet.StringVar(&args.cpuprofile, "cpuprofile", "", "Write cpu profile to specified file")
-- 
cgit v1.2.3