diff --git a/lldb/include/lldb/Host/FileSystem.h b/lldb/include/lldb/Host/FileSystem.h
index ffcb20b0247f..c3ed4f7d7152 100644
--- a/lldb/include/lldb/Host/FileSystem.h
+++ b/lldb/include/lldb/Host/FileSystem.h
@@ -26,15 +26,30 @@ public:
   static const char *DEV_NULL;
   static const char *PATH_CONVERSION_ERROR;
 
+  static FileSpec::PathSyntax GetNativePathSyntax();
+
+  static lldb::user_id_t GetFileSize(const FileSpec &file_spec);
+  static bool GetFileExists(const FileSpec &file_spec);
+
+  static Error Hardlink(const FileSpec &src, const FileSpec &dst);
+  static int GetHardlinkCount(const FileSpec &file_spec);
   static Error Symlink(const FileSpec &src, const FileSpec &dst);
   static Error Readlink(const FileSpec &src, FileSpec &dst);
+  static Error Unlink(const FileSpec &file_spec);
 
   static Error ResolveSymbolicLink(const FileSpec &src, FileSpec &dst);
 
+  /// Return \b true if \a spec is on a locally mounted file system, \b false
+  /// otherwise.
+  static bool IsLocal(const FileSpec &spec);
+
   /// Wraps ::fopen in a platform-independent way. Once opened, FILEs can be
   /// manipulated and closed with the normal ::fread, ::fclose, etc. functions.
   static FILE *Fopen(const char *path, const char *mode);
 
+  /// Wraps ::stat in a platform-independent way.
+  static int Stat(const char *path, struct stat *stats);
+
   static llvm::sys::TimePoint<> GetModificationTime(const FileSpec &file_spec);
 };
 }
diff --git a/lldb/source/Host/common/File.cpp b/lldb/source/Host/common/File.cpp
index 36a931126b46..d7bb8582df61 100644
--- a/lldb/source/Host/common/File.cpp
+++ b/lldb/source/Host/common/File.cpp
@@ -24,11 +24,11 @@
 #endif
 
 #include "llvm/Support/ConvertUTF.h"
-#include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Process.h" // for llvm::sys::Process::FileDescriptorHasColors()
 
 #include "lldb/Host/Config.h"
 #include "lldb/Host/FileSpec.h"
+#include "lldb/Host/FileSystem.h"
 #include "lldb/Utility/DataBufferHeap.h"
 #include "lldb/Utility/Error.h"
 #include "lldb/Utility/Log.h"
@@ -249,12 +249,14 @@ Error File::Open(const char *path, uint32_t options, uint32_t permissions) {
 
 uint32_t File::GetPermissions(const FileSpec &file_spec, Error &error) {
   if (file_spec) {
-    error.Clear();
-    auto Perms = llvm::sys::fs::getPermissions(file_spec.GetPath());
-    if (Perms)
-      return *Perms;
-    error = Error(Perms.getError());
-    return 0;
+    struct stat file_stats;
+    int stat_result = FileSystem::Stat(file_spec.GetCString(), &file_stats);
+    if (stat_result == -1)
+      error.SetErrorToErrno();
+    else {
+      error.Clear();
+      return file_stats.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO);
+    }
   } else
     error.SetErrorString("empty file spec");
   return 0;
diff --git a/lldb/source/Host/common/Host.cpp b/lldb/source/Host/common/Host.cpp
index 649b2c96c2f2..5d254ec05611 100644
--- a/lldb/source/Host/common/Host.cpp
+++ b/lldb/source/Host/common/Host.cpp
@@ -51,6 +51,7 @@
 
 #include "lldb/Core/ArchSpec.h"
 #include "lldb/Host/FileSpec.h"
+#include "lldb/Host/FileSystem.h"
 #include "lldb/Host/Host.h"
 #include "lldb/Host/HostInfo.h"
 #include "lldb/Host/HostProcess.h"
@@ -597,7 +598,8 @@ Error Host::RunShellCommand(const Args &args, const FileSpec &working_dir,
     }
   }
 
-  llvm::sys::fs::remove(output_file_spec.GetPath());
+  if (FileSystem::GetFileExists(output_file_spec))
+    FileSystem::Unlink(output_file_spec);
   return error;
 }
 
diff --git a/lldb/source/Host/macosx/Host.mm b/lldb/source/Host/macosx/Host.mm
index bf39ae1adbf7..700bce93c6d5 100644
--- a/lldb/source/Host/macosx/Host.mm
+++ b/lldb/source/Host/macosx/Host.mm
@@ -62,6 +62,7 @@
 #include "lldb/Core/StructuredData.h"
 #include "lldb/Host/ConnectionFileDescriptor.h"
 #include "lldb/Host/FileSpec.h"
+#include "lldb/Host/FileSystem.h"
 #include "lldb/Host/HostInfo.h"
 #include "lldb/Host/ThreadLauncher.h"
 #include "lldb/Target/Platform.h"
@@ -529,7 +530,7 @@ LaunchInNewTerminalWithAppleScript(const char *exe_path,
     WaitForProcessToSIGSTOP(pid, 5);
   }
 
-  llvm::sys::fs::remove(unix_socket_name.GetPath());
+  FileSystem::Unlink(FileSpec{unix_socket_name, false});
   [applescript release];
   if (pid != LLDB_INVALID_PROCESS_ID)
     launch_info.SetProcessID(pid);
diff --git a/lldb/source/Host/posix/DomainSocket.cpp b/lldb/source/Host/posix/DomainSocket.cpp
index 538979df2b6b..cb0a1d057506 100644
--- a/lldb/source/Host/posix/DomainSocket.cpp
+++ b/lldb/source/Host/posix/DomainSocket.cpp
@@ -9,7 +9,7 @@
 
 #include "lldb/Host/posix/DomainSocket.h"
 
-#include "llvm/Support/FileSystem.h"
+#include "lldb/Host/FileSystem.h"
 
 #include <stddef.h>
 #include <sys/socket.h>
@@ -116,5 +116,5 @@ Error DomainSocket::Accept(llvm::StringRef name, bool child_processes_inherit,
 size_t DomainSocket::GetNameOffset() const { return 0; }
 
 void DomainSocket::DeleteSocketFile(llvm::StringRef name) {
-  llvm::sys::fs::remove(name);
+  FileSystem::Unlink(FileSpec{name, true});
 }
diff --git a/lldb/source/Host/posix/FileSystem.cpp b/lldb/source/Host/posix/FileSystem.cpp
index 22f337fcfec5..4c21fcd34a05 100644
--- a/lldb/source/Host/posix/FileSystem.cpp
+++ b/lldb/source/Host/posix/FileSystem.cpp
@@ -36,6 +36,33 @@ using namespace lldb_private;
 
 const char *FileSystem::DEV_NULL = "/dev/null";
 
+FileSpec::PathSyntax FileSystem::GetNativePathSyntax() {
+  return FileSpec::ePathSyntaxPosix;
+}
+
+lldb::user_id_t FileSystem::GetFileSize(const FileSpec &file_spec) {
+  return file_spec.GetByteSize();
+}
+
+bool FileSystem::GetFileExists(const FileSpec &file_spec) {
+  return file_spec.Exists();
+}
+
+Error FileSystem::Hardlink(const FileSpec &src, const FileSpec &dst) {
+  Error error;
+  if (::link(dst.GetCString(), src.GetCString()) == -1)
+    error.SetErrorToErrno();
+  return error;
+}
+
+int FileSystem::GetHardlinkCount(const FileSpec &file_spec) {
+  struct stat file_stat;
+  if (::stat(file_spec.GetCString(), &file_stat) == 0)
+    return file_stat.st_nlink;
+
+  return -1;
+}
+
 Error FileSystem::Symlink(const FileSpec &src, const FileSpec &dst) {
   Error error;
   if (::symlink(dst.GetCString(), src.GetCString()) == -1)
@@ -43,6 +70,13 @@ Error FileSystem::Symlink(const FileSpec &src, const FileSpec &dst) {
   return error;
 }
 
+Error FileSystem::Unlink(const FileSpec &file_spec) {
+  Error error;
+  if (::unlink(file_spec.GetCString()) == -1)
+    error.SetErrorToErrno();
+  return error;
+}
+
 Error FileSystem::Readlink(const FileSpec &src, FileSpec &dst) {
   Error error;
   char buf[PATH_MAX];
@@ -74,6 +108,50 @@ Error FileSystem::ResolveSymbolicLink(const FileSpec &src, FileSpec &dst) {
   return Error();
 }
 
+#if defined(__NetBSD__)
+static bool IsLocal(const struct statvfs &info) {
+  return (info.f_flag & MNT_LOCAL) != 0;
+}
+#else
+static bool IsLocal(const struct statfs &info) {
+#ifdef __linux__
+#define CIFS_MAGIC_NUMBER 0xFF534D42
+  switch ((uint32_t)info.f_type) {
+  case NFS_SUPER_MAGIC:
+  case SMB_SUPER_MAGIC:
+  case CIFS_MAGIC_NUMBER:
+    return false;
+  default:
+    return true;
+  }
+#else
+  return (info.f_flags & MNT_LOCAL) != 0;
+#endif
+}
+#endif
+
+#if defined(__NetBSD__)
+bool FileSystem::IsLocal(const FileSpec &spec) {
+  struct statvfs statfs_info;
+  std::string path(spec.GetPath());
+  if (statvfs(path.c_str(), &statfs_info) == 0)
+    return ::IsLocal(statfs_info);
+  return false;
+}
+#else
+bool FileSystem::IsLocal(const FileSpec &spec) {
+  struct statfs statfs_info;
+  std::string path(spec.GetPath());
+  if (statfs(path.c_str(), &statfs_info) == 0)
+    return ::IsLocal(statfs_info);
+  return false;
+}
+#endif
+
 FILE *FileSystem::Fopen(const char *path, const char *mode) {
   return ::fopen(path, mode);
 }
+
+int FileSystem::Stat(const char *path, struct stat *stats) {
+  return ::stat(path, stats);
+}
diff --git a/lldb/source/Host/posix/PipePosix.cpp b/lldb/source/Host/posix/PipePosix.cpp
index 3ac5d480de89..4e0810c1a9b3 100644
--- a/lldb/source/Host/posix/PipePosix.cpp
+++ b/lldb/source/Host/posix/PipePosix.cpp
@@ -8,6 +8,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "lldb/Host/posix/PipePosix.h"
+#include "lldb/Host/FileSystem.h"
 #include "lldb/Host/HostInfo.h"
 #include "lldb/Utility/SelectHelper.h"
 #include "llvm/ADT/SmallString.h"
@@ -230,7 +231,7 @@ void PipePosix::Close() {
 }
 
 Error PipePosix::Delete(llvm::StringRef name) {
-  return llvm::sys::fs::remove(name);
+  return FileSystem::Unlink(FileSpec{name.data(), true});
 }
 
 bool PipePosix::CanRead() const {
diff --git a/lldb/source/Host/windows/FileSystem.cpp b/lldb/source/Host/windows/FileSystem.cpp
index 907c0c9337a0..e834c85a28cb 100644
--- a/lldb/source/Host/windows/FileSystem.cpp
+++ b/lldb/source/Host/windows/FileSystem.cpp
@@ -26,6 +26,49 @@ const char *FileSystem::DEV_NULL = "nul";
 const char *FileSystem::PATH_CONVERSION_ERROR =
     "Error converting path between UTF-8 and native encoding";
 
+FileSpec::PathSyntax FileSystem::GetNativePathSyntax() {
+  return FileSpec::ePathSyntaxWindows;
+}
+
+lldb::user_id_t FileSystem::GetFileSize(const FileSpec &file_spec) {
+  return file_spec.GetByteSize();
+}
+
+bool FileSystem::GetFileExists(const FileSpec &file_spec) {
+  return file_spec.Exists();
+}
+
+Error FileSystem::Hardlink(const FileSpec &src, const FileSpec &dst) {
+  Error error;
+  std::wstring wsrc, wdst;
+  if (!llvm::ConvertUTF8toWide(src.GetCString(), wsrc) ||
+      !llvm::ConvertUTF8toWide(dst.GetCString(), wdst))
+    error.SetErrorString(PATH_CONVERSION_ERROR);
+  else if (!::CreateHardLinkW(wsrc.c_str(), wdst.c_str(), nullptr))
+    error.SetError(::GetLastError(), lldb::eErrorTypeWin32);
+  return error;
+}
+
+int FileSystem::GetHardlinkCount(const FileSpec &file_spec) {
+  std::wstring path;
+  if (!llvm::ConvertUTF8toWide(file_spec.GetCString(), path))
+    return -1;
+
+  HANDLE file_handle =
+      ::CreateFileW(path.c_str(), FILE_READ_ATTRIBUTES, FILE_SHARE_READ,
+                    nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);
+
+  if (file_handle == INVALID_HANDLE_VALUE)
+    return -1;
+
+  AutoHandle auto_file_handle(file_handle);
+  BY_HANDLE_FILE_INFORMATION file_info;
+  if (::GetFileInformationByHandle(file_handle, &file_info))
+    return file_info.nNumberOfLinks;
+
+  return -1;
+}
+
 Error FileSystem::Symlink(const FileSpec &src, const FileSpec &dst) {
   Error error;
   std::wstring wsrc, wdst;
@@ -47,6 +90,19 @@ Error FileSystem::Symlink(const FileSpec &src, const FileSpec &dst) {
   return error;
 }
 
+Error FileSystem::Unlink(const FileSpec &file_spec) {
+  Error error;
+  std::wstring path;
+  if (!llvm::ConvertUTF8toWide(file_spec.GetCString(), path)) {
+    error.SetErrorString(PATH_CONVERSION_ERROR);
+    return error;
+  }
+  BOOL result = ::DeleteFileW(path.c_str());
+  if (!result)
+    error.SetError(::GetLastError(), lldb::eErrorTypeWin32);
+  return error;
+}
+
 Error FileSystem::Readlink(const FileSpec &src, FileSpec &dst) {
   Error error;
   std::wstring wsrc;
@@ -84,6 +140,15 @@ Error FileSystem::ResolveSymbolicLink(const FileSpec &src, FileSpec &dst) {
   return Error("ResolveSymbolicLink() isn't implemented on Windows");
 }
 
+bool FileSystem::IsLocal(const FileSpec &spec) {
+  if (spec) {
+    // TODO: return true if the file is on a locally mounted file system
+    return true;
+  }
+
+  return false;
+}
+
 FILE *FileSystem::Fopen(const char *path, const char *mode) {
   std::wstring wpath, wmode;
   if (!llvm::ConvertUTF8toWide(path, wpath))
@@ -95,3 +160,25 @@ FILE *FileSystem::Fopen(const char *path, const char *mode) {
     return nullptr;
   return file;
 }
+
+int FileSystem::Stat(const char *path, struct stat *stats) {
+  std::wstring wpath;
+  if (!llvm::ConvertUTF8toWide(path, wpath)) {
+    errno = EINVAL;
+    return -EINVAL;
+  }
+  int stat_result;
+#ifdef _USE_32BIT_TIME_T
+  struct _stat32 file_stats;
+  stat_result = ::_wstat32(wpath.c_str(), &file_stats);
+#else
+  struct _stat64i32 file_stats;
+  stat_result = ::_wstat64i32(wpath.c_str(), &file_stats);
+#endif
+  if (stat_result == 0) {
+    static_assert(sizeof(struct stat) == sizeof(file_stats),
+                  "stat and _stat32/_stat64i32 must have the same layout");
+    *stats = *reinterpret_cast<struct stat *>(&file_stats);
+  }
+  return stat_result;
+}
diff --git a/lldb/source/Plugins/Platform/POSIX/PlatformPOSIX.cpp b/lldb/source/Plugins/Platform/POSIX/PlatformPOSIX.cpp
index c6ce3efc8ccc..fe1b1056da11 100644
--- a/lldb/source/Plugins/Platform/POSIX/PlatformPOSIX.cpp
+++ b/lldb/source/Plugins/Platform/POSIX/PlatformPOSIX.cpp
@@ -435,12 +435,9 @@ PlatformPOSIX::PutFile(const lldb_private::FileSpec &source,
 }
 
 lldb::user_id_t PlatformPOSIX::GetFileSize(const FileSpec &file_spec) {
-  if (IsHost()) {
-    uint64_t Size;
-    if (llvm::sys::fs::file_size(file_spec.GetPath(), Size))
-      return 0;
-    return Size;
-  } else if (m_remote_platform_sp)
+  if (IsHost())
+    return FileSystem::GetFileSize(file_spec);
+  else if (m_remote_platform_sp)
     return m_remote_platform_sp->GetFileSize(file_spec);
   else
     return Platform::GetFileSize(file_spec);
@@ -466,7 +463,7 @@ bool PlatformPOSIX::GetFileExists(const FileSpec &file_spec) {
 
 Error PlatformPOSIX::Unlink(const FileSpec &file_spec) {
   if (IsHost())
-    return llvm::sys::fs::remove(file_spec.GetPath());
+    return FileSystem::Unlink(file_spec);
   else if (m_remote_platform_sp)
     return m_remote_platform_sp->Unlink(file_spec);
   else
diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerCommon.cpp b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerCommon.cpp
index 5b20713f18f5..758ece5b85ea 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerCommon.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerCommon.cpp
@@ -642,15 +642,14 @@ GDBRemoteCommunicationServerCommon::Handle_vFile_Size(
   std::string path;
   packet.GetHexByteString(path);
   if (!path.empty()) {
-    uint64_t Size;
-    if (llvm::sys::fs::file_size(path, Size))
-      return SendErrorResponse(5);
+    lldb::user_id_t retcode = FileSystem::GetFileSize(FileSpec(path, false));
     StreamString response;
     response.PutChar('F');
-    response.PutHex64(Size);
-    if (Size == UINT64_MAX) {
+    response.PutHex64(retcode);
+    if (retcode == UINT64_MAX) {
       response.PutChar(',');
-      response.PutHex64(Size); // TODO: replace with Host::GetSyswideErrorCode()
+      response.PutHex64(
+          retcode); // TODO: replace with Host::GetSyswideErrorCode()
     }
     return SendPacketNoLock(response.GetString());
   }
@@ -682,7 +681,7 @@ GDBRemoteCommunicationServerCommon::Handle_vFile_Exists(
   std::string path;
   packet.GetHexByteString(path);
   if (!path.empty()) {
-    bool retcode = llvm::sys::fs::exists(path);
+    bool retcode = FileSystem::GetFileExists(FileSpec(path, false));
     StreamString response;
     response.PutChar('F');
     response.PutChar(',');
@@ -715,7 +714,7 @@ GDBRemoteCommunicationServerCommon::Handle_vFile_unlink(
   packet.SetFilePos(::strlen("vFile:unlink:"));
   std::string path;
   packet.GetHexByteString(path);
-  Error error(llvm::sys::fs::remove(path));
+  Error error = FileSystem::Unlink(FileSpec{path, true});
   StreamString response;
   response.Printf("F%u,%u", error.GetError(), error.GetError());
   return SendPacketNoLock(response.GetString());
diff --git a/lldb/source/Target/ModuleCache.cpp b/lldb/source/Target/ModuleCache.cpp
index a4aa26a0e480..b35e2d79b20e 100644
--- a/lldb/source/Target/ModuleCache.cpp
+++ b/lldb/source/Target/ModuleCache.cpp
@@ -13,6 +13,7 @@
 #include "lldb/Core/ModuleList.h"
 #include "lldb/Core/ModuleSpec.h"
 #include "lldb/Host/File.h"
+#include "lldb/Host/FileSystem.h"
 #include "lldb/Host/LockFile.h"
 #include "lldb/Utility/Log.h"
 #include "llvm/Support/FileSystem.h"
@@ -100,12 +101,11 @@ void DeleteExistingModule(const FileSpec &root_dir_spec,
                   module_uuid.GetAsString().c_str(), error.AsCString());
   }
 
-  namespace fs = llvm::sys::fs;
-  fs::file_status st;
-  if (status(sysroot_module_path_spec.GetPath(), st))
+  auto link_count = FileSystem::GetHardlinkCount(sysroot_module_path_spec);
+  if (link_count == -1)
     return;
 
-  if (st.getLinkCount() > 2) // module is referred by other hosts.
+  if (link_count > 2) // module is referred by other hosts.
     return;
 
   const auto module_spec_dir = GetModuleDirectory(root_dir_spec, module_uuid);
@@ -119,10 +119,11 @@ void DecrementRefExistingModule(const FileSpec &root_dir_spec,
   DeleteExistingModule(root_dir_spec, sysroot_module_path_spec);
 
   // Remove sysroot link.
-  llvm::sys::fs::remove(sysroot_module_path_spec.GetPath());
+  FileSystem::Unlink(sysroot_module_path_spec);
 
   FileSpec symfile_spec = GetSymbolFileSpec(sysroot_module_path_spec);
-  llvm::sys::fs::remove(symfile_spec.GetPath());
+  if (symfile_spec.Exists()) // delete module's symbol file if exists.
+    FileSystem::Unlink(symfile_spec);
 }
 
 Error CreateHostSysRootModuleLink(const FileSpec &root_dir_spec,
@@ -145,8 +146,7 @@ Error CreateHostSysRootModuleLink(const FileSpec &root_dir_spec,
   if (error.Fail())
     return error;
 
-  return llvm::sys::fs::create_hard_link(local_module_spec.GetPath(),
-                                         sysroot_module_path_spec.GetPath());
+  return FileSystem::Hardlink(sysroot_module_path_spec, local_module_spec);
 }
 
 } // namespace
@@ -179,7 +179,7 @@ void ModuleLock::Delete() {
     return;
 
   m_file.Close();
-  llvm::sys::fs::remove(m_file_spec.GetPath());
+  FileSystem::Unlink(m_file_spec);
 }
 
 /////////////////////////////////////////////////////////////////////////
diff --git a/lldb/source/Target/Platform.cpp b/lldb/source/Target/Platform.cpp
index acafa8b35c59..ac8a168b93e5 100644
--- a/lldb/source/Target/Platform.cpp
+++ b/lldb/source/Target/Platform.cpp
@@ -696,7 +696,8 @@ Error Platform::Install(const FileSpec &src, const FileSpec &dst) {
     namespace fs = llvm::sys::fs;
     switch (fs::get_file_type(src.GetPath(), false)) {
     case fs::file_type::directory_file: {
-      llvm::sys::fs::remove(fixed_dst.GetPath());
+      if (GetFileExists(fixed_dst))
+        Unlink(fixed_dst);
       uint32_t permissions = src.GetPermissions();
       if (permissions == 0)
         permissions = eFilePermissionsDirectoryDefault;
@@ -715,12 +716,14 @@ Error Platform::Install(const FileSpec &src, const FileSpec &dst) {
     } break;
 
     case fs::file_type::regular_file:
-      llvm::sys::fs::remove(fixed_dst.GetPath());
+      if (GetFileExists(fixed_dst))
+        Unlink(fixed_dst);
       error = PutFile(src, fixed_dst);
       break;
 
     case fs::file_type::symlink_file: {
-      llvm::sys::fs::remove(fixed_dst.GetPath());
+      if (GetFileExists(fixed_dst))
+        Unlink(fixed_dst);
       FileSpec src_resolved;
       error = FileSystem::Readlink(src, src_resolved);
       if (error.Success())