[NaCl SDK] nacl_io: Remove Node::Access method.

This is implemented generically in terms of GetStat().

Review URL: https://codereview.chromium.org/547053002

Cr-Commit-Position: refs/heads/master@{#294057}

27 files changed, 117 insertions, 230 deletions

diff --git a/native_client_sdk/src/libraries/nacl_io/devfs/dev_fs.cc b/native_client_sdk/src/libraries/nacl_io/devfs/dev_fs.cc
index 6dd7642..f29e411 100644
--- a/native_client_sdk/src/libraries/nacl_io/devfs/dev_fs.cc
+++ b/native_client_sdk/src/libraries/nacl_io/devfs/dev_fs.cc
@@ -240,21 +240,6 @@ Error FsNode::VIoctl(int request, va_list args) {
 
 }  // namespace
 
-Error DevFs::Access(const Path& path, int a_mode) {
-  ScopedNode node;
-  int error = root_->FindChild(path.Join(), &node);
-  if (error)
-    return error;
-
-  // Don't allow execute access.
-  if (a_mode & X_OK) {
-    LOG_TRACE("Executing devfs nodes is not allowed.");
-    return EACCES;
-  }
-
-  return 0;
-}
-
 Error DevFs::Open(const Path& path, int open_flags, ScopedNode* out_node) {
   out_node->reset(NULL);
   int error;
diff --git a/native_client_sdk/src/libraries/nacl_io/devfs/dev_fs.h b/native_client_sdk/src/libraries/nacl_io/devfs/dev_fs.h
index a17dc85..9d20b6b 100644
--- a/native_client_sdk/src/libraries/nacl_io/devfs/dev_fs.h
+++ b/native_client_sdk/src/libraries/nacl_io/devfs/dev_fs.h
@@ -14,7 +14,6 @@ class Node;
 
 class DevFs : public Filesystem {
  public:
-  virtual Error Access(const Path& path, int a_mode);
   virtual Error Open(const Path& path, int open_flags, ScopedNode* out_node);
   virtual Error Unlink(const Path& path);
   virtual Error Mkdir(const Path& path, int permissions);
diff --git a/native_client_sdk/src/libraries/nacl_io/filesystem.h b/native_client_sdk/src/libraries/nacl_io/filesystem.h
index b05810b..8194100 100644
--- a/native_client_sdk/src/libraries/nacl_io/filesystem.h
+++ b/native_client_sdk/src/libraries/nacl_io/filesystem.h
@@ -62,10 +62,6 @@ class Filesystem : public sdk_util::RefObject {
 
   // All paths in functions below are expected to containing a leading "/".
 
-  // Test whether a file or directory at a given path can be accessed.
-  // Returns 0 on success, or an appropriate errno value on failure.
-  virtual Error Access(const Path& path, int a_mode) = 0;
-
   // Open a node at |path| with the specified open flags. The resulting
   // Node is created with a ref count of 1.
   // Assumes that |out_node| is non-NULL.
diff --git a/native_client_sdk/src/libraries/nacl_io/fusefs/fuse_fs.cc b/native_client_sdk/src/libraries/nacl_io/fusefs/fuse_fs.cc
index 5763d86..fe4c8ec 100644
--- a/native_client_sdk/src/libraries/nacl_io/fusefs/fuse_fs.cc
+++ b/native_client_sdk/src/libraries/nacl_io/fusefs/fuse_fs.cc
@@ -57,19 +57,6 @@ void FuseFs::Destroy() {
     fuse_ops_->destroy(fuse_user_data_);
 }
 
-Error FuseFs::Access(const Path& path, int a_mode) {
-  if (!fuse_ops_->access) {
-    LOG_TRACE("fuse_ops_->access is NULL.");
-    return ENOSYS;
-  }
-
-  int result = fuse_ops_->access(path.Join().c_str(), a_mode);
-  if (result < 0)
-    return -result;
-
-  return 0;
-}
-
 Error FuseFs::Open(const Path& path, int open_flags, ScopedNode* out_node) {
   std::string path_str = path.Join();
   const char* path_cstr = path_str.c_str();
diff --git a/native_client_sdk/src/libraries/nacl_io/fusefs/fuse_fs.h b/native_client_sdk/src/libraries/nacl_io/fusefs/fuse_fs.h
index 2c41e3f..1673b08 100644
--- a/native_client_sdk/src/libraries/nacl_io/fusefs/fuse_fs.h
+++ b/native_client_sdk/src/libraries/nacl_io/fusefs/fuse_fs.h
@@ -21,7 +21,6 @@ class FuseFs : public Filesystem {
   virtual void Destroy();
 
  public:
-  virtual Error Access(const Path& path, int a_mode);
   virtual Error Open(const Path& path, int mode, ScopedNode* out_node);
   virtual Error Unlink(const Path& path);
   virtual Error Mkdir(const Path& path, int perm);
diff --git a/native_client_sdk/src/libraries/nacl_io/html5fs/html5_fs.cc b/native_client_sdk/src/libraries/nacl_io/html5fs/html5_fs.cc
index 00d2e93..1cd8c37 100644
--- a/native_client_sdk/src/libraries/nacl_io/html5fs/html5_fs.cc
+++ b/native_client_sdk/src/libraries/nacl_io/html5fs/html5_fs.cc
@@ -29,12 +29,6 @@ int64_t strtoull(const char* nptr, char** endptr, int base) {
 
 }  // namespace
 
-Error Html5Fs::Access(const Path& path, int a_mode) {
-  // a_mode is unused, since all files are readable, writable and executable.
-  ScopedNode node;
-  return Open(path, O_RDONLY, &node);
-}
-
 Error Html5Fs::Open(const Path& path, int open_flags, ScopedNode* out_node) {
   out_node->reset(NULL);
   Error error = BlockUntilFilesystemOpen();
diff --git a/native_client_sdk/src/libraries/nacl_io/html5fs/html5_fs.h b/native_client_sdk/src/libraries/nacl_io/html5fs/html5_fs.h
index 8233639..40bc314 100644
--- a/native_client_sdk/src/libraries/nacl_io/html5fs/html5_fs.h
+++ b/native_client_sdk/src/libraries/nacl_io/html5fs/html5_fs.h
@@ -18,7 +18,6 @@ class Node;
 
 class Html5Fs : public Filesystem {
  public:
-  virtual Error Access(const Path& path, int a_mode);
   virtual Error Open(const Path& path, int mode, ScopedNode* out_node);
   virtual Error Unlink(const Path& path);
   virtual Error Mkdir(const Path& path, int permissions);
diff --git a/native_client_sdk/src/libraries/nacl_io/httpfs/http_fs.cc b/native_client_sdk/src/libraries/nacl_io/httpfs/http_fs.cc
index 67dcc48..74e7383 100644
--- a/native_client_sdk/src/libraries/nacl_io/httpfs/http_fs.cc
+++ b/native_client_sdk/src/libraries/nacl_io/httpfs/http_fs.cc
@@ -41,31 +41,6 @@ std::string NormalizeHeaderKey(const std::string& s) {
   return result;
 }
 
-Error HttpFs::Access(const Path& path, int a_mode) {
-  ScopedNode node = FindExistingNode(path);
-  if (node.get() == NULL) {
-    // If we can't find the node in the cache, fetch it
-    std::string url = MakeUrl(path);
-    node.reset(new HttpFsNode(this, url, cache_content_));
-    Error error = node->Init(0);
-    if (error)
-      return error;
-
-    error = node->GetStat(NULL);
-    if (error)
-      return error;
-  }
-
-  int obj_mode = node->GetMode();
-  if (((a_mode & R_OK) && !(obj_mode & S_IREAD)) ||
-      ((a_mode & W_OK) && !(obj_mode & S_IWRITE)) ||
-      ((a_mode & X_OK) && !(obj_mode & S_IEXEC))) {
-    return EACCES;
-  }
-
-  return 0;
-}
-
 Error HttpFs::Open(const Path& path, int open_flags, ScopedNode* out_node) {
   out_node->reset(NULL);
 
diff --git a/native_client_sdk/src/libraries/nacl_io/httpfs/http_fs.h b/native_client_sdk/src/libraries/nacl_io/httpfs/http_fs.h
index 766529c..a5bca62 100644
--- a/native_client_sdk/src/libraries/nacl_io/httpfs/http_fs.h
+++ b/native_client_sdk/src/libraries/nacl_io/httpfs/http_fs.h
@@ -18,7 +18,6 @@ class HttpFs : public Filesystem {
  public:
   typedef std::map<std::string, ScopedNode> NodeMap_t;
 
-  virtual Error Access(const Path& path, int a_mode);
   virtual Error Open(const Path& path, int mode, ScopedNode* out_node);
   virtual Error Unlink(const Path& path);
   virtual Error Mkdir(const Path& path, int permissions);
diff --git a/native_client_sdk/src/libraries/nacl_io/jsfs/js_fs.cc b/native_client_sdk/src/libraries/nacl_io/jsfs/js_fs.cc
index 9c0b215..b0f18a5 100644
--- a/native_client_sdk/src/libraries/nacl_io/jsfs/js_fs.cc
+++ b/native_client_sdk/src/libraries/nacl_io/jsfs/js_fs.cc
@@ -391,19 +391,6 @@ PP_Var JsFs::WaitForResponse(RequestId request_id) {
   }
 }
 
-Error JsFs::Access(const Path& path, int a_mode) {
-  ScopedVar response(ppapi_);
-  if (!SendRequestAndWait(&response, "%s%s%d",
-                          "cmd", "access",
-                          "path", path.Join().c_str(),
-                          "amode", a_mode)) {
-    LOG_ERROR("Failed to send request.");
-    return EINVAL;
-  }
-
-  return ErrorFromResponse(response);
-}
-
 Error JsFs::Open(const Path& path, int open_flags, ScopedNode* out_node) {
   out_node->reset(NULL);
   ScopedVar response(ppapi_);
diff --git a/native_client_sdk/src/libraries/nacl_io/jsfs/js_fs.h b/native_client_sdk/src/libraries/nacl_io/jsfs/js_fs.h
index a01f19c..901ac57 100644
--- a/native_client_sdk/src/libraries/nacl_io/jsfs/js_fs.h
+++ b/native_client_sdk/src/libraries/nacl_io/jsfs/js_fs.h
@@ -35,7 +35,6 @@ class JsFs : public Filesystem {
   virtual void Destroy();
 
  public:
-  virtual Error Access(const Path& path, int a_mode);
   virtual Error Open(const Path& path, int mode, ScopedNode* out_node);
   virtual Error Unlink(const Path& path);
   virtual Error Mkdir(const Path& path, int perm);
diff --git a/native_client_sdk/src/libraries/nacl_io/kernel_proxy.cc b/native_client_sdk/src/libraries/nacl_io/kernel_proxy.cc
index a35e182..6d52caf 100644
--- a/native_client_sdk/src/libraries/nacl_io/kernel_proxy.cc
+++ b/native_client_sdk/src/libraries/nacl_io/kernel_proxy.cc
@@ -843,20 +843,18 @@ int KernelProxy::fcntl(int fd, int request, va_list args) {
 }
 
 int KernelProxy::access(const char* path, int amode) {
-  ScopedFilesystem fs;
-  Path rel;
+  struct stat buf;
+  int rtn = stat(path, &buf);
+  if (rtn != 0)
+    return rtn;
 
-  Error error = AcquireFsAndRelPath(path, &fs, &rel);
-  if (error) {
-    errno = error;
+  if (((amode & R_OK) && !(buf.st_mode & S_IREAD)) ||
+      ((amode & W_OK) && !(buf.st_mode & S_IWRITE)) ||
+      ((amode & X_OK) && !(buf.st_mode & S_IEXEC))) {
+    errno = EACCES;
     return -1;
   }
 
-  error = fs->Access(rel, amode);
-  if (error) {
-    errno = error;
-    return -1;
-  }
   return 0;
 }
 
diff --git a/native_client_sdk/src/libraries/nacl_io/memfs/mem_fs.cc b/native_client_sdk/src/libraries/nacl_io/memfs/mem_fs.cc
index d29602d..a159c32 100644
--- a/native_client_sdk/src/libraries/nacl_io/memfs/mem_fs.cc
+++ b/native_client_sdk/src/libraries/nacl_io/memfs/mem_fs.cc
@@ -75,23 +75,6 @@ Error MemFs::FindNode(const Path& path, int type, ScopedNode* out_node) {
   return 0;
 }
 
-Error MemFs::Access(const Path& path, int a_mode) {
-  ScopedNode node;
-  Error error = FindNode(path, 0, &node);
-
-  if (error)
-    return error;
-
-  int obj_mode = node->GetMode();
-  if (((a_mode & R_OK) && !(obj_mode & S_IREAD)) ||
-      ((a_mode & W_OK) && !(obj_mode & S_IWRITE)) ||
-      ((a_mode & X_OK) && !(obj_mode & S_IEXEC))) {
-    return EACCES;
-  }
-
-  return 0;
-}
-
 Error MemFs::Open(const Path& path, int open_flags, ScopedNode* out_node) {
   out_node->reset(NULL);
   ScopedNode node;
diff --git a/native_client_sdk/src/libraries/nacl_io/memfs/mem_fs.h b/native_client_sdk/src/libraries/nacl_io/memfs/mem_fs.h
index 6212b6e..3438d79 100644
--- a/native_client_sdk/src/libraries/nacl_io/memfs/mem_fs.h
+++ b/native_client_sdk/src/libraries/nacl_io/memfs/mem_fs.h
@@ -29,7 +29,6 @@ class MemFs : public Filesystem {
   virtual Error FindNode(const Path& path, int type, ScopedNode* out_node);
 
  public:
-  virtual Error Access(const Path& path, int a_mode);
   virtual Error Open(const Path& path, int mode, ScopedNode* out_node);
   virtual Error Unlink(const Path& path);
   virtual Error Mkdir(const Path& path, int perm);
diff --git a/native_client_sdk/src/libraries/nacl_io/passthroughfs/passthrough_fs.cc b/native_client_sdk/src/libraries/nacl_io/passthroughfs/passthrough_fs.cc
index 93dbf18..2858faf 100644
--- a/native_client_sdk/src/libraries/nacl_io/passthroughfs/passthrough_fs.cc
+++ b/native_client_sdk/src/libraries/nacl_io/passthroughfs/passthrough_fs.cc
@@ -22,11 +22,6 @@ Error PassthroughFs::Init(const FsInitArgs& args) {
 void PassthroughFs::Destroy() {
 }
 
-Error PassthroughFs::Access(const Path& path, int a_mode) {
-  // There is no underlying 'access' syscall in NaCl. It just returns ENOSYS.
-  return ENOSYS;
-}
-
 Error PassthroughFs::Open(const Path& path, int mode, ScopedNode* out_node) {
   out_node->reset(NULL);
   int real_fd;
diff --git a/native_client_sdk/src/libraries/nacl_io/passthroughfs/passthrough_fs.h b/native_client_sdk/src/libraries/nacl_io/passthroughfs/passthrough_fs.h
index a26ca71..baad6cd 100644
--- a/native_client_sdk/src/libraries/nacl_io/passthroughfs/passthrough_fs.h
+++ b/native_client_sdk/src/libraries/nacl_io/passthroughfs/passthrough_fs.h
@@ -18,7 +18,6 @@ class PassthroughFs : public Filesystem {
   virtual void Destroy();
 
  public:
-  virtual Error Access(const Path& path, int a_mode);
   virtual Error Open(const Path& path, int mode, ScopedNode* out_node);
   virtual Error OpenResource(const Path& path, ScopedNode* out_node);
   virtual Error Unlink(const Path& path);
diff --git a/native_client_sdk/src/libraries/nacl_io/stream/stream_fs.cc b/native_client_sdk/src/libraries/nacl_io/stream/stream_fs.cc
index 8f5ef61..a7d9184 100644
--- a/native_client_sdk/src/libraries/nacl_io/stream/stream_fs.cc
+++ b/native_client_sdk/src/libraries/nacl_io/stream/stream_fs.cc
@@ -84,10 +84,6 @@ StreamFs::~StreamFs() {
   pthread_cond_destroy(&message_cond_);
 }
 
-Error StreamFs::Access(const Path& path, int a_mode) {
-  return EACCES;
-}
-
 Error StreamFs::Open(const Path& path, int o_flags, ScopedNode* out_node) {
   return EACCES;
 }
diff --git a/native_client_sdk/src/libraries/nacl_io/stream/stream_fs.h b/native_client_sdk/src/libraries/nacl_io/stream/stream_fs.h
index 28e1dda..ea136eb 100644
--- a/native_client_sdk/src/libraries/nacl_io/stream/stream_fs.h
+++ b/native_client_sdk/src/libraries/nacl_io/stream/stream_fs.h
@@ -54,7 +54,6 @@ class StreamFs : public Filesystem {
   // of a MountSocketWork object.
   static PP_CompletionCallback GetRunCompletion(Work* work);
 
-  virtual Error Access(const Path& path, int a_mode);
   virtual Error Open(const Path& path, int o_flags, ScopedNode* out_node);
   virtual Error Unlink(const Path& path);
   virtual Error Mkdir(const Path& path, int permissions);
diff --git a/native_client_sdk/src/tests/nacl_io_test/dev_fs_for_testing.h b/native_client_sdk/src/tests/nacl_io_test/dev_fs_for_testing.h
index a898a12..b16c215 100644
--- a/native_client_sdk/src/tests/nacl_io_test/dev_fs_for_testing.h
+++ b/native_client_sdk/src/tests/nacl_io_test/dev_fs_for_testing.h
@@ -20,6 +20,15 @@ class DevFsForTesting : public nacl_io::DevFs {
     Init(args);
   }
 
+  bool Exists(const char* filename) {
+    nacl_io::ScopedNode node;
+    if (Open(nacl_io::Path(filename), O_RDONLY, &node))
+      return false;
+
+    struct stat buf;
+    return node->GetStat(&buf) == 0;
+  }
+
   int num_nodes() { return (int)inode_pool_.size(); }
 };
 
diff --git a/native_client_sdk/src/tests/nacl_io_test/filesystem_test.cc b/native_client_sdk/src/tests/nacl_io_test/filesystem_test.cc
index 6089b01..d957991 100644
--- a/native_client_sdk/src/tests/nacl_io_test/filesystem_test.cc
+++ b/native_client_sdk/src/tests/nacl_io_test/filesystem_test.cc
@@ -28,6 +28,15 @@ class MemFsForTesting : public MemFs {
     EXPECT_EQ(0, Init(args));
   }
 
+  bool Exists(const char* filename) {
+    ScopedNode node;
+    if (Open(Path(filename), O_RDONLY, &node))
+      return false;
+
+    struct stat buf;
+    return node->GetStat(&buf) == 0;
+  }
+
   int num_nodes() { return (int)inode_pool_.size(); }
 };
 
@@ -42,13 +51,13 @@ TEST(FilesystemTest, Sanity) {
 
   off_t result_size = 0;
   int result_bytes = 0;
+  struct stat buf;
   char buf1[1024];
 
   // A memory filesystem starts with one directory node: the root.
   EXPECT_EQ(1, fs.num_nodes());
 
   // Fail to open non existent file
-  EXPECT_EQ(ENOENT, fs.Access(Path("/foo"), R_OK | W_OK));
   EXPECT_EQ(ENOENT, fs.Open(Path("/foo"), O_RDWR, &result_node));
   EXPECT_EQ(NULL, result_node.get());
   EXPECT_EQ(1, fs.num_nodes());
@@ -59,14 +68,16 @@ TEST(FilesystemTest, Sanity) {
 
   // We now have a directory and a file.  The file has a two references
   // one returned to the test, one for the name->inode map.
-  EXPECT_EQ(2, fs.num_nodes());
-  EXPECT_EQ(2, file->RefCount());
-  EXPECT_EQ(0, fs.Access(Path("/foo"), R_OK | W_OK));
-  EXPECT_EQ(EACCES, fs.Access(Path("/foo"), X_OK));
+  ASSERT_EQ(2, fs.num_nodes());
+  ASSERT_EQ(2, file->RefCount());
+  ASSERT_EQ(0, file->GetStat(&buf));
+  ASSERT_EQ(0, buf.st_mode & S_IXUSR);
 
   // All access should be allowed on the root directory.
-  EXPECT_EQ(0, fs.Access(Path("/"), R_OK | W_OK | X_OK));
-  // Open the root directory for write should fail.
+  EXPECT_EQ(0, fs.Open(Path("/"), O_RDONLY, &root));
+  ASSERT_EQ(0, root->GetStat(&buf));
+  ASSERT_EQ(S_IRWXU, buf.st_mode & S_IRWXU);
+  // Opening a directory for write should fail.
   EXPECT_EQ(EISDIR, fs.Open(Path("/"), O_RDWR, &root));
   EXPECT_EQ(2, fs.num_nodes());
 
@@ -157,8 +168,7 @@ TEST(FilesystemTest, Sanity) {
   EXPECT_EQ(1, fs.num_nodes());
 
   // Verify the directory is gone
-  EXPECT_EQ(ENOENT, fs.Access(Path("/foo"), F_OK));
-  EXPECT_EQ(ENOENT, fs.Open(Path("/foo"), O_RDWR, &file));
+  EXPECT_EQ(ENOENT, fs.Open(Path("/foo"), O_RDONLY, &file));
   EXPECT_EQ(NULL_NODE, file.get());
 }
 
@@ -213,25 +223,25 @@ TEST(FilesystemTest, MemFsRename) {
 
   ScopedNode file;
   ASSERT_EQ(0, fs.Open(Path("/dir1/file"), O_RDWR | O_CREAT | O_EXCL, &file));
-  ASSERT_EQ(0, fs.Access(Path("/dir1/file"), R_OK));
+  ASSERT_TRUE(fs.Exists("/dir1/file"));
   ASSERT_EQ(4, fs.num_nodes());
 
   // Move from one directory to another should ok
   ASSERT_EQ(0, fs.Rename(Path("/dir1/file"), Path("/dir2/new_file")));
-  ASSERT_NE(0, fs.Access(Path("/dir1/file"), R_OK));
-  ASSERT_EQ(0, fs.Access(Path("/dir2/new_file"), R_OK));
+  ASSERT_FALSE(fs.Exists("/dir1/file"));
+  ASSERT_TRUE(fs.Exists("/dir2/new_file"));
   ASSERT_EQ(4, fs.num_nodes());
 
   // Move within the same directory
   ASSERT_EQ(0, fs.Rename(Path("/dir2/new_file"), Path("/dir2/new_file2")));
-  ASSERT_NE(0, fs.Access(Path("/dir2/new_file"), R_OK));
-  ASSERT_EQ(0, fs.Access(Path("/dir2/new_file2"), R_OK));
+  ASSERT_FALSE(fs.Exists("/dir2/new_file"));
+  ASSERT_TRUE(fs.Exists("/dir2/new_file2"));
   ASSERT_EQ(4, fs.num_nodes());
 
   // Move to another directory but without a filename
   ASSERT_EQ(0, fs.Rename(Path("/dir2/new_file2"), Path("/dir1")));
-  ASSERT_NE(0, fs.Access(Path("/dir2/new_file2"), R_OK));
-  ASSERT_EQ(0, fs.Access(Path("/dir1/new_file2"), R_OK));
+  ASSERT_FALSE(fs.Exists("/dir2/new_file2"));
+  ASSERT_TRUE(fs.Exists("/dir1/new_file2"));
   ASSERT_EQ(4, fs.num_nodes());
 }
 
@@ -244,8 +254,8 @@ TEST(FilesystemTest, MemFsRenameDir) {
 
   // Renaming one directory to another should work
   ASSERT_EQ(0, fs.Rename(Path("/dir1"), Path("/dir2")));
-  ASSERT_NE(0, fs.Access(Path("/dir1"), R_OK));
-  ASSERT_EQ(0, fs.Access(Path("/dir2"), R_OK));
+  ASSERT_FALSE(fs.Exists("/dir1"));
+  ASSERT_TRUE(fs.Exists("/dir2"));
   EXPECT_EQ(2, fs.num_nodes());
 
   // Reset to initial state
@@ -254,8 +264,8 @@ TEST(FilesystemTest, MemFsRenameDir) {
 
   // Renaming a directory to a new name within another
   ASSERT_EQ(0, fs.Rename(Path("/dir1"), Path("/dir2/foo")));
-  ASSERT_EQ(0, fs.Access(Path("/dir2"), R_OK));
-  ASSERT_EQ(0, fs.Access(Path("/dir2/foo"), R_OK));
+  ASSERT_TRUE(fs.Exists("/dir2"));
+  ASSERT_TRUE(fs.Exists("/dir2/foo"));
   EXPECT_EQ(3, fs.num_nodes());
 
   // Reset to initial state
@@ -273,7 +283,7 @@ TEST(FilesystemTest, DevAccess) {
   FakePepperInterface pepper;
   DevFsForTesting fs(&pepper);
   ScopedNode invalid_node, valid_node;
-  ASSERT_EQ(ENOENT, fs.Access(Path("/foo"), F_OK));
+  ASSERT_FALSE(fs.Exists("/foo"));
   // Creating non-existent file should return EACCES
   ASSERT_EQ(EACCES, fs.Open(Path("/foo"), O_CREAT | O_RDWR, &invalid_node));
 
@@ -295,11 +305,12 @@ TEST(FilesystemTest, DevNull) {
   DevFsForTesting fs(&pepper);
   ScopedNode dev_null;
   int result_bytes = 0;
+  struct stat buf;
 
-  ASSERT_EQ(0, fs.Access(Path("/null"), R_OK | W_OK));
-  ASSERT_EQ(EACCES, fs.Access(Path("/null"), X_OK));
   ASSERT_EQ(0, fs.Open(Path("/null"), O_RDWR, &dev_null));
   ASSERT_NE(NULL_NODE, dev_null.get());
+  ASSERT_EQ(0, dev_null->GetStat(&buf));
+  ASSERT_EQ(S_IRUSR | S_IWUSR, buf.st_mode & S_IRWXU);
 
   // Writing to /dev/null should write everything.
   const char msg[] = "Dummy test message.";
@@ -319,11 +330,12 @@ TEST(FilesystemTest, DevZero) {
   DevFsForTesting fs(&pepper);
   ScopedNode dev_zero;
   int result_bytes = 0;
+  struct stat buf;
 
-  ASSERT_EQ(0, fs.Access(Path("/zero"), R_OK | W_OK));
-  ASSERT_EQ(EACCES, fs.Access(Path("/zero"), X_OK));
   ASSERT_EQ(0, fs.Open(Path("/zero"), O_RDWR, &dev_zero));
   ASSERT_NE(NULL_NODE, dev_zero.get());
+  ASSERT_EQ(0, dev_zero->GetStat(&buf));
+  ASSERT_EQ(S_IRUSR | S_IWUSR, buf.st_mode & S_IRWXU);
 
   // Writing to /dev/zero should write everything.
   HandleAttr attrs;
@@ -350,11 +362,12 @@ TEST(FilesystemTest, DISABLED_DevUrandom) {
   DevFsForTesting fs(&pepper);
   ScopedNode dev_urandom;
   int result_bytes = 0;
+  struct stat buf;
 
-  ASSERT_EQ(0, fs.Access(Path("/urandom"), R_OK | W_OK));
-  ASSERT_EQ(EACCES, fs.Access(Path("/urandom"), X_OK));
   ASSERT_EQ(0, fs.Open(Path("/urandom"), O_RDWR, &dev_urandom));
   ASSERT_NE(NULL_NODE, dev_urandom.get());
+  ASSERT_EQ(0, dev_urandom->GetStat(&buf));
+  ASSERT_EQ(S_IRUSR | S_IWUSR, buf.st_mode & S_IRWXU);
 
   // Writing to /dev/urandom should write everything.
   const char msg[] = "Dummy test message.";
diff --git a/native_client_sdk/src/tests/nacl_io_test/html5_fs_test.cc b/native_client_sdk/src/tests/nacl_io_test/html5_fs_test.cc
index 883fdff..ea04dc0 100644
--- a/native_client_sdk/src/tests/nacl_io_test/html5_fs_test.cc
+++ b/native_client_sdk/src/tests/nacl_io_test/html5_fs_test.cc
@@ -48,6 +48,15 @@ class Html5FsForTesting : public Html5Fs {
     Error error = Init(args);
     EXPECT_EQ(expected_error, error);
   }
+
+  bool Exists(const char* filename) {
+    ScopedNode node;
+    if (Open(Path(filename), O_RDONLY, &node))
+      return false;
+
+    struct stat buf;
+    return node->GetStat(&buf) == 0;
+  }
 };
 
 class Html5FsTest : public ::testing::Test {
@@ -143,7 +152,7 @@ TEST_F(Html5FsTest, PassFilesystemResource) {
     ScopedRef<Html5FsForTesting> fs(
         new Html5FsForTesting(map, &ppapi_));
 
-    ASSERT_EQ(0, fs->Access(Path("/foo"), R_OK | W_OK | X_OK));
+    ASSERT_TRUE(fs->Exists("/foo"));
 
     ppapi_html5_.GetCoreInterface()->ReleaseResource(filesystem);
   }
@@ -156,18 +165,8 @@ TEST_F(Html5FsTest, MountSubtree) {
   map["SOURCE"] = "/foo";
   ScopedRef<Html5FsForTesting> fs(new Html5FsForTesting(map, &ppapi_));
 
-  ASSERT_EQ(0, fs->Access(Path("/bar"), R_OK | W_OK | X_OK));
-  ASSERT_EQ(ENOENT, fs->Access(Path("/foo/bar"), F_OK));
-}
-
-TEST_F(Html5FsTest, Access) {
-  EXPECT_TRUE(ppapi_html5_.filesystem_template()->AddEmptyFile("/foo", NULL));
-
-  StringMap_t map;
-  ScopedRef<Html5FsForTesting> fs(new Html5FsForTesting(map, &ppapi_));
-
-  ASSERT_EQ(0, fs->Access(Path("/foo"), R_OK | W_OK | X_OK));
-  ASSERT_EQ(ENOENT, fs->Access(Path("/bar"), F_OK));
+  ASSERT_TRUE(fs->Exists("/bar"));
+  ASSERT_FALSE(fs->Exists("/foo/bar"));
 }
 
 TEST_F(Html5FsTest, Mkdir) {
@@ -178,7 +177,7 @@ TEST_F(Html5FsTest, Mkdir) {
   EXPECT_EQ(EEXIST, fs->Mkdir(Path("/"), 0644));
 
   Path path("/foo");
-  ASSERT_EQ(ENOENT, fs->Access(path, F_OK));
+  ASSERT_FALSE(fs->Exists("/foo"));
   ASSERT_EQ(0, fs->Mkdir(path, 0644));
 
   struct stat stat;
@@ -189,15 +188,16 @@ TEST_F(Html5FsTest, Mkdir) {
 }
 
 TEST_F(Html5FsTest, Remove) {
-  EXPECT_TRUE(ppapi_html5_.filesystem_template()->AddEmptyFile("/foo", NULL));
+  const char* kPath = "/foo";
+  EXPECT_TRUE(ppapi_html5_.filesystem_template()->AddEmptyFile(kPath, NULL));
 
   StringMap_t map;
   ScopedRef<Html5FsForTesting> fs(new Html5FsForTesting(map, &ppapi_));
 
-  Path path("/foo");
-  ASSERT_EQ(0, fs->Access(path, F_OK));
+  Path path(kPath);
+  ASSERT_TRUE(fs->Exists(kPath));
   ASSERT_EQ(0, fs->Remove(path));
-  EXPECT_EQ(ENOENT, fs->Access(path, F_OK));
+  EXPECT_FALSE(fs->Exists(kPath));
 }
 
 TEST_F(Html5FsTest, Unlink) {
@@ -207,10 +207,12 @@ TEST_F(Html5FsTest, Unlink) {
   StringMap_t map;
   ScopedRef<Html5FsForTesting> fs(new Html5FsForTesting(map, &ppapi_));
 
+  ASSERT_TRUE(fs->Exists("/dir"));
+  ASSERT_TRUE(fs->Exists("/file"));
+  ASSERT_EQ(0, fs->Unlink(Path("/file")));
   ASSERT_EQ(EISDIR, fs->Unlink(Path("/dir")));
-  EXPECT_EQ(0, fs->Unlink(Path("/file")));
-  EXPECT_EQ(ENOENT, fs->Access(Path("/file"), F_OK));
-  EXPECT_EQ(0, fs->Access(Path("/dir"), F_OK));
+  EXPECT_FALSE(fs->Exists("/file"));
+  EXPECT_TRUE(fs->Exists("/dir"));
 }
 
 TEST_F(Html5FsTest, Rmdir) {
@@ -222,8 +224,8 @@ TEST_F(Html5FsTest, Rmdir) {
 
   ASSERT_EQ(ENOTDIR, fs->Rmdir(Path("/file")));
   EXPECT_EQ(0, fs->Rmdir(Path("/dir")));
-  EXPECT_EQ(ENOENT, fs->Access(Path("/dir"), F_OK));
-  EXPECT_EQ(0, fs->Access(Path("/file"), F_OK));
+  EXPECT_FALSE(fs->Exists("/dir"));
+  EXPECT_TRUE(fs->Exists("/file"));
 }
 
 TEST_F(Html5FsTest, Rename) {
@@ -232,21 +234,19 @@ TEST_F(Html5FsTest, Rename) {
   StringMap_t map;
   ScopedRef<Html5FsForTesting> fs(new Html5FsForTesting(map, &ppapi_));
 
-  Path path("/foo");
-  Path newpath("/bar");
-  ASSERT_EQ(0, fs->Access(path, F_OK));
-  ASSERT_EQ(0, fs->Rename(path, newpath));
-  EXPECT_EQ(ENOENT, fs->Access(path, F_OK));
-  EXPECT_EQ(0, fs->Access(newpath, F_OK));
+  ASSERT_TRUE(fs->Exists("/foo"));
+  ASSERT_EQ(0, fs->Rename(Path("/foo"), Path("/bar")));
+  EXPECT_FALSE(fs->Exists("/foo"));
+  EXPECT_TRUE(fs->Exists("/bar"));
 }
 
 TEST_F(Html5FsTest, OpenForCreate) {
   StringMap_t map;
   ScopedRef<Html5FsForTesting> fs(new Html5FsForTesting(map, &ppapi_));
 
-  Path path("/foo");
-  EXPECT_EQ(ENOENT, fs->Access(path, F_OK));
+  EXPECT_FALSE(fs->Exists("/foo"));
 
+  Path path("/foo");
   ScopedNode node;
   ASSERT_EQ(0, fs->Open(path, O_CREAT | O_RDWR, &node));
 
diff --git a/native_client_sdk/src/tests/nacl_io_test/http_fs_test.cc b/native_client_sdk/src/tests/nacl_io_test/http_fs_test.cc
index a0d4bf5..0c521dc 100644
--- a/native_client_sdk/src/tests/nacl_io_test/http_fs_test.cc
+++ b/native_client_sdk/src/tests/nacl_io_test/http_fs_test.cc
@@ -78,15 +78,6 @@ class HttpFsLargeFileTest : public HttpFsTest {
 
 }  // namespace
 
-TEST_P(HttpFsTest, Access) {
-  ASSERT_TRUE(ppapi_.server_template()->AddEntity("foo", "", NULL));
-
-  ASSERT_EQ(0, fs_.Access(Path("/foo"), R_OK));
-  ASSERT_EQ(EACCES, fs_.Access(Path("/foo"), W_OK));
-  ASSERT_EQ(EACCES, fs_.Access(Path("/foo"), X_OK));
-  ASSERT_EQ(ENOENT, fs_.Access(Path("/bar"), F_OK));
-}
-
 TEST_P(HttpFsTest, OpenAndCloseServerError) {
   EXPECT_TRUE(ppapi_.server_template()->AddError("file", 500));
 
@@ -278,9 +269,9 @@ TEST(HttpFsDirTest, Root) {
   ASSERT_TRUE(node->IsaDir());
 
   // We have to r+w access to the root node
-  ASSERT_EQ(0, fs.Access(Path("/"), R_OK));
-  ASSERT_EQ(0, fs.Access(Path("/"), X_OK));
-  ASSERT_EQ(EACCES, fs.Access(Path("/"), W_OK));
+  struct stat buf;
+  ASSERT_EQ(0, node->GetStat(&buf));
+  ASSERT_EQ(S_IXUSR | S_IRUSR, buf.st_mode & S_IRWXU);
 }
 
 TEST(HttpFsDirTest, Mkdir) {
@@ -392,20 +383,17 @@ TEST(HttpFsBlobUrlTest, Basic) {
 
   HttpFsForTesting fs(args, &ppapi);
 
-  // Check access to root folder
-  ASSERT_EQ(0, fs.Access(Path("/"), R_OK));
-  ASSERT_EQ(EACCES, fs.Access(Path("/"), W_OK));
-  ASSERT_EQ(EACCES, fs.Access(Path("/"), X_OK));
-
-  // Any other path will fail.
-  ScopedNode foo;
-  ASSERT_EQ(ENOENT, fs.Access(Path("/blah"), R_OK));
-
-  // Verify file size
+  // Any other path than / should fail.
   ScopedNode node;
-  struct stat statbuf;
+  ASSERT_EQ(ENOENT, fs.Open(Path("/blah"), R_OK, &node));
+
+  // Check access to blob file
   ASSERT_EQ(0, fs.Open(Path("/"), O_RDONLY, &node));
-  ASSERT_EQ(0, node->GetStat(&statbuf));
-  ASSERT_EQ(0, node->GetStat(&statbuf));
-  ASSERT_EQ(strlen(kContent), statbuf.st_size);
+  ASSERT_EQ(true, node->IsaFile());
+
+  // Verify file size and permissions
+  struct stat buf;
+  ASSERT_EQ(0, node->GetStat(&buf));
+  ASSERT_EQ(S_IRUSR, buf.st_mode & S_IRWXU);
+  ASSERT_EQ(strlen(kContent), buf.st_size);
 }
diff --git a/native_client_sdk/src/tests/nacl_io_test/js_fs_test.cc b/native_client_sdk/src/tests/nacl_io_test/js_fs_test.cc
index 58e94c3..b116763 100644
--- a/native_client_sdk/src/tests/nacl_io_test/js_fs_test.cc
+++ b/native_client_sdk/src/tests/nacl_io_test/js_fs_test.cc
@@ -518,27 +518,6 @@ const int JsFsNodeTest::fd = 123;
 
 }  // namespace
 
-TEST_F(JsFsTest, Access) {
-  int a_mode = R_OK | W_OK | X_OK;
-
-  PP_Var expected;
-  ASSERT_EQ(true, CreateDict(&expected));
-  ASSERT_EQ(true, SetDictKeyValue(&expected, "id", 1));
-  ASSERT_EQ(true, SetDictKeyValue(&expected, "cmd", "access"));
-  ASSERT_EQ(true, SetDictKeyValue(&expected, "path", "/foo"));
-  ASSERT_EQ(true, SetDictKeyValue(&expected, "amode", a_mode));
-
-  PP_Var response;
-  ASSERT_EQ(true, CreateDict(&response));
-  ASSERT_EQ(true, SetDictKeyValue(&response, "id", 1));
-  ASSERT_EQ(true, SetDictKeyValue(&response, "error", 0));
-
-  Expect(expected, response);
-  StartJsThread();
-
-  EXPECT_EQ(0, fs_->Access(Path("/foo"), a_mode));
-}
-
 TEST_F(JsFsTest, Open) {
   PP_Var expected;
   ASSERT_EQ(true, CreateDict(&expected));
diff --git a/native_client_sdk/src/tests/nacl_io_test/jspipe_test.cc b/native_client_sdk/src/tests/nacl_io_test/jspipe_test.cc
index ea2ba54..788d2b5 100644
--- a/native_client_sdk/src/tests/nacl_io_test/jspipe_test.cc
+++ b/native_client_sdk/src/tests/nacl_io_test/jspipe_test.cc
@@ -122,10 +122,11 @@ class JSPipeNodeTest : public ::testing::Test {
 
   void SetUp() {
     name_ = "jspipe1";
-    ASSERT_EQ(0, fs_.Access(Path("/jspipe1"), R_OK | W_OK));
-    ASSERT_EQ(EACCES, fs_.Access(Path("/jspipe1"), X_OK));
     ASSERT_EQ(0, fs_.Open(Path("/jspipe1"), O_RDWR, &pipe_dev_));
     ASSERT_NE(NULL_NODE, pipe_dev_.get());
+    struct stat buf;
+    ASSERT_EQ(0, pipe_dev_->GetStat(&buf));
+    ASSERT_EQ(S_IRUSR | S_IWUSR, buf.st_mode & S_IRWXU);
   }
 
   /**
diff --git a/native_client_sdk/src/tests/nacl_io_test/kernel_proxy_test.cc b/native_client_sdk/src/tests/nacl_io_test/kernel_proxy_test.cc
index a84442c..4c0ab08 100644
--- a/native_client_sdk/src/tests/nacl_io_test/kernel_proxy_test.cc
+++ b/native_client_sdk/src/tests/nacl_io_test/kernel_proxy_test.cc
@@ -701,7 +701,6 @@ class KernelProxyMMapTest_Node : public Node {
 
 class KernelProxyMMapTest_Filesystem : public Filesystem {
  public:
-  virtual Error Access(const Path& path, int a_mode) { return 0; }
   virtual Error Open(const Path& path, int mode, ScopedNode* out_node) {
     out_node->reset(new KernelProxyMMapTest_Node(this));
     return 0;
diff --git a/native_client_sdk/src/tests/nacl_io_test/mem_fs_node_test.cc b/native_client_sdk/src/tests/nacl_io_test/mem_fs_node_test.cc
index dc521c6..f2259d7 100644
--- a/native_client_sdk/src/tests/nacl_io_test/mem_fs_node_test.cc
+++ b/native_client_sdk/src/tests/nacl_io_test/mem_fs_node_test.cc
@@ -36,6 +36,15 @@ class MemFsForTesting : public MemFs {
     EXPECT_EQ(0, Init(args));
   }
 
+  bool Exists(const char* filename) {
+    ScopedNode node;
+    if (Open(Path(filename), O_RDONLY, &node))
+      return false;
+
+    struct stat buf;
+    return node->GetStat(&buf) == 0;
+  }
+
   int num_nodes() { return inode_pool_.size(); }
 };
 
diff --git a/native_client_sdk/src/tests/nacl_io_test/tty_test.cc b/native_client_sdk/src/tests/nacl_io_test/tty_test.cc
index 6a390e0..b45fa80 100644
--- a/native_client_sdk/src/tests/nacl_io_test/tty_test.cc
+++ b/native_client_sdk/src/tests/nacl_io_test/tty_test.cc
@@ -37,10 +37,11 @@ class TtyNodeTest : public ::testing::Test {
   TtyNodeTest() : fs_(&ppapi_) {}
 
   void SetUp() {
-    ASSERT_EQ(0, fs_.Access(Path("/tty"), R_OK | W_OK));
-    ASSERT_EQ(EACCES, fs_.Access(Path("/tty"), X_OK));
     ASSERT_EQ(0, fs_.Open(Path("/tty"), O_RDWR, &dev_tty_));
     ASSERT_NE(NULL_NODE, dev_tty_.get());
+    struct stat buf;
+    ASSERT_EQ(0, dev_tty_->GetStat(&buf));
+    ASSERT_EQ(S_IRUSR | S_IWUSR, buf.st_mode & S_IRWXU);
   }
 
  protected: