Use new reference count utility throughout gvisor.

This uses the refs_vfs2 template in vfs2 as well as objects common to vfs1 and
vfs2. Note that vfs1-only refcounts are not replaced, since vfs1 will be deleted
soon anyway.

The following structs now use the new tool, with leak check enabled:
devpts:rootInode
fuse:inode
kernfs:Dentry
kernfs:dir
kernfs:readonlyDir
kernfs:StaticDirectory
proc:fdDirInode
proc:fdInfoDirInode
proc:subtasksInode
proc:taskInode
proc:tasksInode
vfs:FileDescription
vfs:MountNamespace
vfs:Filesystem
sys:dir
kernel:FSContext
kernel:ProcessGroup
kernel:Session
shm:Shm
mm:aioMappable
mm:SpecialMappable
transport:queue

And the following use the template, but because they currently are not leak
checked, a TODO is left instead of enabling leak check in this patch:
kernel:FDTable
tun:tunEndpoint

Updates #1486.

PiperOrigin-RevId: 328460377

1 files changed, 15 insertions, 0 deletions

diff --git a/pkg/sentry/fsimpl/sys/BUILD b/pkg/sentry/fsimpl/sys/BUILD
index f9b232da6..906cd52cb 100644
--- a/pkg/sentry/fsimpl/sys/BUILD
+++ b/pkg/sentry/fsimpl/sys/BUILD
@@ -1,10 +1,23 @@
 load("//tools:defs.bzl", "go_library", "go_test")
+load("//tools/go_generics:defs.bzl", "go_template_instance")
 
 licenses(["notice"])
 
+go_template_instance(
+    name = "dir_refs",
+    out = "dir_refs.go",
+    package = "sys",
+    prefix = "dir",
+    template = "//pkg/refs_vfs2:refs_template",
+    types = {
+        "T": "dir",
+    },
+)
+
 go_library(
     name = "sys",
     srcs = [
+        "dir_refs.go",
         "kcov.go",
         "sys.go",
     ],
@@ -13,6 +26,8 @@ go_library(
         "//pkg/abi/linux",
         "//pkg/context",
         "//pkg/coverage",
+        "//pkg/log",
+        "//pkg/refs",
         "//pkg/sentry/arch",
         "//pkg/sentry/fsimpl/kernfs",
         "//pkg/sentry/kernel",