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authorJakob Unterwurzacher2019-01-06 20:31:41 +0100
committerJakob Unterwurzacher2019-01-06 20:31:41 +0100
commitc83aa417e4396ea416b831d13e7a370ddbda5cb1 (patch)
tree0d2bbbe07504142f32404ef307151990b215b74c /tests/matrix/fallocate_test.go
parentdb425cab9e59d066b831236dff8f55561363f0ae (diff)
tests: move fallocate tests to its own file
matrix_test.go is already too big.
Diffstat (limited to 'tests/matrix/fallocate_test.go')
-rw-r--r--tests/matrix/fallocate_test.go158
1 files changed, 158 insertions, 0 deletions
diff --git a/tests/matrix/fallocate_test.go b/tests/matrix/fallocate_test.go
new file mode 100644
index 0000000..6928b4a
--- /dev/null
+++ b/tests/matrix/fallocate_test.go
@@ -0,0 +1,158 @@
+package matrix
+
+import (
+ "os"
+ "runtime"
+ "syscall"
+ "testing"
+
+ "github.com/rfjakob/gocryptfs/internal/syscallcompat"
+ "github.com/rfjakob/gocryptfs/tests/test_helpers"
+)
+
+const (
+ // From man statfs
+ TMPFS_MAGIC = 0x01021994
+ EXT4_SUPER_MAGIC = 0xef53
+)
+
+// isWellKnownFS decides if the backing filesystem is well-known.
+// The expected allocated sizes are only valid on tmpfs and ext4. btrfs
+// gives different results, but that's not an error.
+func isWellKnownFS(fn string) bool {
+ var fs syscall.Statfs_t
+ err := syscall.Statfs(fn, &fs)
+ if err != nil {
+ panic(err)
+ }
+ if fs.Type == EXT4_SUPER_MAGIC || fs.Type == TMPFS_MAGIC {
+ return true
+ }
+ return false
+}
+
+const FALLOC_DEFAULT = 0x00
+const FALLOC_FL_KEEP_SIZE = 0x01
+
+func TestFallocate(t *testing.T) {
+ if runtime.GOOS == "darwin" {
+ t.Skipf("OSX does not support fallocate")
+ }
+ fn := test_helpers.DefaultPlainDir + "/fallocate"
+ file, err := os.Create(fn)
+ if err != nil {
+ t.FailNow()
+ }
+ defer file.Close()
+ wellKnown := isWellKnownFS(test_helpers.DefaultCipherDir)
+ fd := int(file.Fd())
+ nBytes := test_helpers.Du(t, fd)
+ if nBytes != 0 {
+ t.Fatalf("Empty file has %d bytes", nBytes)
+ }
+ // Allocate 30 bytes, keep size
+ // gocryptfs || (0 blocks)
+ // ext4 | d | (1 block)
+ // ^ d = data block
+ err = syscallcompat.Fallocate(fd, FALLOC_FL_KEEP_SIZE, 0, 30)
+ if err != nil {
+ t.Error(err)
+ }
+ var want int64
+ nBytes = test_helpers.Du(t, fd)
+ want = 4096
+ if nBytes != want {
+ t.Errorf("Expected %d allocated bytes, have %d", want, nBytes)
+ }
+ test_helpers.VerifySize(t, fn, 0)
+ // Three ciphertext blocks. The middle one should be a file hole.
+ // gocryptfs | h | h | d| (1 block)
+ // ext4 | d | h | d | (2 blocks)
+ // ^ h = file hole
+ // (Note that gocryptfs blocks are slightly bigger than the ext4 blocks,
+ // but the last one is partial)
+ err = file.Truncate(9000)
+ if err != nil {
+ t.Fatal(err)
+ }
+ nBytes = test_helpers.Du(t, fd)
+ want = 2 * 4096
+ if wellKnown && nBytes != want {
+ t.Errorf("Expected %d allocated bytes, have %d", want, nBytes)
+ }
+ if md5 := test_helpers.Md5fn(fn); md5 != "5420afa22f6423a9f59e669540656bb4" {
+ t.Errorf("Wrong md5 %s", md5)
+ }
+ // Allocate the whole file space
+ // gocryptfs | h | h | d| (1 block)
+ // ext4 | d | d | d | (3 blocks
+ err = syscallcompat.Fallocate(fd, FALLOC_DEFAULT, 0, 9000)
+ if err != nil {
+ t.Fatal(err)
+ }
+ nBytes = test_helpers.Du(t, fd)
+ want = 3 * 4096
+ if nBytes != want {
+ t.Errorf("Expected %d allocated bytes, have %d", want, nBytes)
+ }
+ // Neither apparent size nor content should have changed
+ test_helpers.VerifySize(t, fn, 9000)
+ if md5 := test_helpers.Md5fn(fn); md5 != "5420afa22f6423a9f59e669540656bb4" {
+ t.Errorf("Wrong md5 %s", md5)
+ }
+
+ // Partial block on the end. The first ext4 block is dirtied by the header.
+ // gocryptfs | h | h | d| (1 block)
+ // ext4 | d | h | d | (2 blocks)
+ file.Truncate(0)
+ file.Truncate(9000)
+ nBytes = test_helpers.Du(t, fd)
+ want = 2 * 4096
+ if wellKnown && nBytes != want {
+ t.Errorf("Expected %d allocated bytes, have %d", want, nBytes)
+ }
+ // Allocate 10 bytes in the second block
+ // gocryptfs | h | h | d| (1 block)
+ // ext4 | d | d | d | (3 blocks)
+ syscallcompat.Fallocate(fd, FALLOC_DEFAULT, 5000, 10)
+ nBytes = test_helpers.Du(t, fd)
+ want = 3 * 4096
+ if wellKnown && nBytes != want {
+ t.Errorf("Expected %d allocated bytes, have %d", want, nBytes)
+ }
+ // Neither apparent size nor content should have changed
+ test_helpers.VerifySize(t, fn, 9000)
+ if md5 := test_helpers.Md5fn(fn); md5 != "5420afa22f6423a9f59e669540656bb4" {
+ t.Errorf("Wrong md5 %s", md5)
+ }
+ // Grow the file to 4 blocks
+ // gocryptfs | h | h | d |d| (2 blocks)
+ // ext4 | d | d | d | d | (4 blocks)
+ syscallcompat.Fallocate(fd, FALLOC_DEFAULT, 15000, 10)
+ nBytes = test_helpers.Du(t, fd)
+ want = 4 * 4096
+ if wellKnown && nBytes != want {
+ t.Errorf("Expected %d allocated bytes, have %d", want, nBytes)
+ }
+ test_helpers.VerifySize(t, fn, 15010)
+ if md5 := test_helpers.Md5fn(fn); md5 != "c4c44c7a41ab7798a79d093eb44f99fc" {
+ t.Errorf("Wrong md5 %s", md5)
+ }
+ // Shrinking a file using fallocate should have no effect
+ for _, off := range []int64{0, 10, 2000, 5000} {
+ for _, sz := range []int64{0, 1, 42, 6000} {
+ syscallcompat.Fallocate(fd, FALLOC_DEFAULT, off, sz)
+ test_helpers.VerifySize(t, fn, 15010)
+ if md5 := test_helpers.Md5fn(fn); md5 != "c4c44c7a41ab7798a79d093eb44f99fc" {
+ t.Errorf("Wrong md5 %s", md5)
+ }
+ }
+ }
+ // Cleanup
+ syscall.Unlink(fn)
+ if !wellKnown {
+ // Even though most tests have been executed still, inform the user
+ // that some were disabled
+ t.Skipf("backing fs is not ext4 or tmpfs, skipped some disk-usage checks\n")
+ }
+}