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scsi: Add tests and fix refcount bug
Adds various tests to the SCSI manager code. As part of this testing, a bug tracking attachment refcounts was also found. The attachment refcount is increased every time a new top-level request comes in, even if an existing mount is re-used. This means that the attachment refcount should also be decremented every time one is released, even if the mount refcount is not at 0. Signed-off-by: Kevin Parsons <kevpar@microsoft.com>
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,237 @@ | ||
package scsi | ||
|
||
import ( | ||
"context" | ||
"reflect" | ||
"testing" | ||
) | ||
|
||
func removeIndex[T any](a []T, i int) []T { | ||
return append(a[:i], a[i+1:]...) | ||
} | ||
|
||
func TestRemoveIndex(t *testing.T) { | ||
a := []int{1, 2, 3, 4, 5} | ||
a = removeIndex(a, 2) | ||
if !reflect.DeepEqual(a, []int{1, 2, 4, 5}) { | ||
t.Errorf("wrong values: %v", a) | ||
} | ||
a = removeIndex(a, 1) | ||
if !reflect.DeepEqual(a, []int{1, 4, 5}) { | ||
t.Errorf("wrong values: %v", a) | ||
} | ||
a = removeIndex(a, 0) | ||
if !reflect.DeepEqual(a, []int{4, 5}) { | ||
t.Errorf("wrong values: %v", a) | ||
} | ||
a = removeIndex(a, 1) | ||
if !reflect.DeepEqual(a, []int{4}) { | ||
t.Errorf("wrong values: %v", a) | ||
} | ||
a = removeIndex(a, 0) | ||
if !reflect.DeepEqual(a, []int{}) { | ||
t.Errorf("wrong values: %v", a) | ||
} | ||
} | ||
|
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type testAttachment struct { | ||
controller uint | ||
lun uint | ||
config *attachConfig | ||
} | ||
|
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type testMount struct { | ||
controller uint | ||
lun uint | ||
path string | ||
config *mountConfig | ||
} | ||
|
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type hostBackend struct { | ||
attachments []*testAttachment | ||
} | ||
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func (hb *hostBackend) attach(ctx context.Context, controller uint, lun uint, config *attachConfig) error { | ||
hb.attachments = append(hb.attachments, &testAttachment{ | ||
controller: controller, | ||
lun: lun, | ||
config: config, | ||
}) | ||
return nil | ||
} | ||
|
||
func (hb *hostBackend) detach(ctx context.Context, controller uint, lun uint) error { | ||
for i, a := range hb.attachments { | ||
if a.controller == controller && a.lun == lun { | ||
hb.attachments = removeIndex(hb.attachments, i) | ||
break | ||
} | ||
} | ||
return nil | ||
} | ||
|
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func (hb *hostBackend) attachmentPaths() []string { | ||
ret := []string{} | ||
for _, a := range hb.attachments { | ||
ret = append(ret, a.config.path) | ||
} | ||
return ret | ||
} | ||
|
||
type guestBackend struct { | ||
mounts []*testMount | ||
} | ||
|
||
func (gb *guestBackend) mount(ctx context.Context, controller uint, lun uint, path string, config *mountConfig) error { | ||
gb.mounts = append(gb.mounts, &testMount{ | ||
controller: controller, | ||
lun: lun, | ||
path: path, | ||
config: config, | ||
}) | ||
return nil | ||
} | ||
|
||
func (gb *guestBackend) unmount(ctx context.Context, controller uint, lun uint, path string, config *mountConfig) error { | ||
for i, m := range gb.mounts { | ||
if m.path == path { | ||
gb.mounts = removeIndex(gb.mounts, i) | ||
break | ||
} | ||
} | ||
return nil | ||
} | ||
|
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func (gb *guestBackend) unplug(ctx context.Context, controller uint, lun uint) error { | ||
return nil | ||
} | ||
|
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func (gb *guestBackend) mountPaths() []string { | ||
ret := []string{} | ||
for _, m := range gb.mounts { | ||
ret = append(ret, m.path) | ||
} | ||
return ret | ||
} | ||
|
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func TestAddAddRemoveRemove(t *testing.T) { | ||
ctx := context.Background() | ||
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hb := &hostBackend{} | ||
gb := &guestBackend{} | ||
mgr, err := NewManager(hb, gb, 4, 64, "/var/run/scsi/%d", nil) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
m1, err := mgr.AddVirtualDisk(ctx, "path", true, "", "", &MountConfig{}) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
m2, err := mgr.AddVirtualDisk(ctx, "path", true, "", "", &MountConfig{}) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
if m1.GuestPath() == "" { | ||
t.Error("guest path for m1 should not be empty") | ||
} | ||
if m1.GuestPath() != m2.GuestPath() { | ||
t.Errorf("expected same guest paths for both mounts, but got %q and %q", m1.GuestPath(), m2.GuestPath()) | ||
} | ||
if !reflect.DeepEqual(hb.attachmentPaths(), []string{"path"}) { | ||
t.Errorf("wrong attachment paths after add: %v", hb.attachmentPaths()) | ||
} | ||
if err := m1.Release(ctx); err != nil { | ||
t.Fatal(err) | ||
} | ||
if err := m2.Release(ctx); err != nil { | ||
t.Fatal(err) | ||
} | ||
if !reflect.DeepEqual(hb.attachmentPaths(), []string{}) { | ||
t.Errorf("wrong attachment paths after remove: %v", hb.attachmentPaths()) | ||
} | ||
} | ||
|
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func TestGuestPath(t *testing.T) { | ||
ctx := context.Background() | ||
|
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hb := &hostBackend{} | ||
gb := &guestBackend{} | ||
mgr, err := NewManager(hb, gb, 4, 64, "/var/run/scsi/%d", nil) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
|
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m1, err := mgr.AddVirtualDisk(ctx, "path", true, "", "/mnt1", &MountConfig{}) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
// m1 should get the guest path it asked for. | ||
if m1.GuestPath() != "/mnt1" { | ||
t.Errorf("wrong guest path for m1: %s", m1.GuestPath()) | ||
} | ||
if !reflect.DeepEqual(gb.mountPaths(), []string{"/mnt1"}) { | ||
t.Errorf("wrong mount paths after adding m1: %v", gb.mountPaths()) | ||
} | ||
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m2, err := mgr.AddVirtualDisk(ctx, "path", true, "", "", &MountConfig{}) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
// m2 didn't ask for a guest path, so it should re-use m1. | ||
if m2.GuestPath() != "/mnt1" { | ||
t.Errorf("wrong guest path for m2: %s", m2.GuestPath()) | ||
} | ||
if !reflect.DeepEqual(gb.mountPaths(), []string{"/mnt1"}) { | ||
t.Errorf("wrong mount paths after adding m2: %v", gb.mountPaths()) | ||
} | ||
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m3, err := mgr.AddVirtualDisk(ctx, "path", true, "", "/mnt2", &MountConfig{}) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
// m3 should get the guest path it asked for. | ||
if m3.GuestPath() != "/mnt2" { | ||
t.Errorf("wrong guest path for m3: %s", m2.GuestPath()) | ||
} | ||
if !reflect.DeepEqual(gb.mountPaths(), []string{"/mnt1", "/mnt2"}) { | ||
t.Errorf("wrong mount paths after adding m3: %v", gb.mountPaths()) | ||
} | ||
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if err := m3.Release(ctx); err != nil { | ||
t.Fatal(err) | ||
} | ||
if !reflect.DeepEqual(gb.mountPaths(), []string{"/mnt1"}) { | ||
t.Errorf("wrong mount paths after removing m3: %v", gb.mountPaths()) | ||
} | ||
if err := m2.Release(ctx); err != nil { | ||
t.Fatal(err) | ||
} | ||
if !reflect.DeepEqual(gb.mountPaths(), []string{"/mnt1"}) { | ||
t.Errorf("wrong mount paths after removing m2: %v", gb.mountPaths()) | ||
} | ||
if err := m1.Release(ctx); err != nil { | ||
t.Fatal(err) | ||
} | ||
if !reflect.DeepEqual(gb.mountPaths(), []string{}) { | ||
t.Errorf("wrong mount paths after removing m1: %v", gb.mountPaths()) | ||
} | ||
} | ||
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func TestConflictingGuestPath(t *testing.T) { | ||
ctx := context.Background() | ||
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hb := &hostBackend{} | ||
gb := &guestBackend{} | ||
mgr, err := NewManager(hb, gb, 4, 64, "/var/run/scsi/%d", nil) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
|
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if _, err := mgr.AddVirtualDisk(ctx, "path", true, "", "/mnt1", &MountConfig{}); err != nil { | ||
t.Fatal(err) | ||
} | ||
// Different host path but same guest path as m1, should conflict. | ||
if _, err := mgr.AddVirtualDisk(ctx, "path2", true, "", "/mnt1", &MountConfig{}); err == nil { | ||
t.Fatalf("expected error but got none") | ||
} | ||
} |
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