Commit c3186132 authored by Jakob Unterwurzacher's avatar Jakob Unterwurzacher Committed by Han-Wen Nienhuys

fs: tests: add TestStaleHardlinks (fails at the moment)

This test shows a problem in selecting a random path
for a node when there is more than one.

The failure looks like this:

  18:41:50.796468 rx 136: LOOKUP n1 ["link0"] 6b
  18:41:50.796489 tx 136:     OK, {n2 g1 tE=0s tA=0s {M0100600 SZ=0 L=1 1026:1026 B0*4096 i0:269663 A 1616348510.793212 M 1616348510.793212 C 1616348510.795212}}
  18:41:50.796535 rx 138: OPEN n2 {O_RDONLY,0x8000}
  18:41:50.796557 tx 138:     2=no such file or directory, {Fh 0 }

The LOOKUP succeeds (because the file "link0" is there).
But the OPEN fails because go-fuse chooses another (stale) path.

I will try to make the behavoir more robust against changes
behind our back, but this patch only adds a test to show the
problem.

Change-Id: I39b31ba717ddaaad7dda6ecd86707c75cd25102e
parent 7b2174ea
...@@ -630,6 +630,51 @@ func TestFsstress(t *testing.T) { ...@@ -630,6 +630,51 @@ func TestFsstress(t *testing.T) {
} }
} }
// TestStaleHardlinks creates a lot of hard links and deletes them again
// behind the back of the loopback fs. Then opens the original file.
//
// Fails at the moment. Core of the problem:
//
// 18:41:50.796468 rx 136: LOOKUP n1 ["link0"] 6b
// 18:41:50.796489 tx 136: OK, {n2 g1 tE=0s tA=0s {M0100600 SZ=0 L=1 1026:1026 B0*4096 i0:269663 A 1616348510.793212 M 1616348510.793212 C 1616348510.795212}}
// 18:41:50.796535 rx 138: OPEN n2 {O_RDONLY,0x8000}
// 18:41:50.796557 tx 138: 2=no such file or directory, {Fh 0 }
func TestStaleHardlinks(t *testing.T) {
// Disable all caches we can disable
tc := newTestCase(t, &testOptions{attrCache: false, entryCache: false})
defer tc.Clean()
// "link0" is original file
link0 := tc.mntDir + "/link0"
if fd, err := syscall.Creat(link0, 0600); err != nil {
t.Fatal(err)
} else {
syscall.Close(fd)
}
// Create hardlinks via mntDir
for i := 1; i < 20; i++ {
linki := fmt.Sprintf(tc.mntDir+"/link%d", i)
if err := syscall.Link(link0, linki); err != nil {
t.Fatal(err)
}
}
// Delete hardlinks via origDir (behind loopback fs's back)
for i := 1; i < 20; i++ {
linki := fmt.Sprintf(tc.origDir+"/link%d", i)
if err := syscall.Unlink(linki); err != nil {
t.Fatal(err)
}
}
// Try to open link0 via mntDir
fd, err := syscall.Open(link0, syscall.O_RDONLY, 0)
if err != nil {
t.Error(err)
} else {
syscall.Close(fd)
}
}
func init() { func init() {
syscall.Umask(0) syscall.Umask(0)
} }
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