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, 37 insertions, 0 deletions

diff --git a/pkg/sentry/vfs/BUILD b/pkg/sentry/vfs/BUILD
index 642769e7c..8093ca55c 100644
--- a/pkg/sentry/vfs/BUILD
+++ b/pkg/sentry/vfs/BUILD
@@ -27,6 +27,39 @@ go_template_instance(
     },
 )
 
+go_template_instance(
+    name = "file_description_refs",
+    out = "file_description_refs.go",
+    package = "vfs",
+    prefix = "FileDescription",
+    template = "//pkg/refs_vfs2:refs_template",
+    types = {
+        "T": "FileDescription",
+    },
+)
+
+go_template_instance(
+    name = "mount_namespace_refs",
+    out = "mount_namespace_refs.go",
+    package = "vfs",
+    prefix = "MountNamespace",
+    template = "//pkg/refs_vfs2:refs_template",
+    types = {
+        "T": "MountNamespace",
+    },
+)
+
+go_template_instance(
+    name = "filesystem_refs",
+    out = "filesystem_refs.go",
+    package = "vfs",
+    prefix = "Filesystem",
+    template = "//pkg/refs_vfs2:refs_template",
+    types = {
+        "T": "Filesystem",
+    },
+)
+
 go_library(
     name = "vfs",
     srcs = [
@@ -40,12 +73,15 @@ go_library(
         "event_list.go",
         "file_description.go",
         "file_description_impl_util.go",
+        "file_description_refs.go",
         "filesystem.go",
         "filesystem_impl_util.go",
+        "filesystem_refs.go",
         "filesystem_type.go",
         "inotify.go",
         "lock.go",
         "mount.go",
+        "mount_namespace_refs.go",
         "mount_unsafe.go",
         "options.go",
         "pathname.go",
@@ -63,6 +99,7 @@ go_library(
         "//pkg/fspath",
         "//pkg/gohacks",
         "//pkg/log",
+        "//pkg/refs",
         "//pkg/safemem",
         "//pkg/sentry/arch",
         "//pkg/sentry/fs",