[newlib-cygwin/main] Cygwin: fs_info: check for SSD

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=8b01c5d6903fbcbb14c52db45c12494b53493c5a

commit 8b01c5d6903fbcbb14c52db45c12494b53493c5a
Author:     Corinna Vinschen <corinna@vinschen.de>
AuthorDate: Thu Nov 30 22:13:49 2023 +0100
Commit:     Corinna Vinschen <corinna@vinschen.de>
CommitDate: Thu Nov 30 22:37:35 2023 +0100

    Cygwin: fs_info: check for SSD
    
    During fs_info::update, check for the file being on an SSD.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/local_includes/mount.h |  4 ++++
 winsup/cygwin/mount.cc               | 14 ++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/winsup/cygwin/local_includes/mount.h b/winsup/cygwin/local_includes/mount.h
index 5bb84b9769cb..57c89e010161 100644
--- a/winsup/cygwin/local_includes/mount.h
+++ b/winsup/cygwin/local_includes/mount.h
@@ -69,6 +69,7 @@ class fs_info
     ULONG name_len;		/* MaximumComponentNameLength */
     fs_info_type fs_type;	/* Filesystem type */
     unsigned is_remote_drive		: 1;
+    unsigned is_ssd			: 1;
     unsigned has_acls			: 1;
     unsigned hasgood_inode		: 1;
     unsigned caseinsensitive		: 1;
@@ -80,6 +81,8 @@ class fs_info
   ULONG sernum;			/* Volume Serial Number */
   char fsn[80];			/* Windows filesystem name */
 
+  void check_ssd (HANDLE);
+
  public:
   void clear ()
   {
@@ -93,6 +96,7 @@ class fs_info
   IMPLEMENT_STATUS_FLAG (ULONG, samba_version)
   IMPLEMENT_STATUS_FLAG (ULONG, name_len)
   IMPLEMENT_STATUS_FLAG (bool, is_remote_drive)
+  IMPLEMENT_STATUS_FLAG (bool, is_ssd)
   IMPLEMENT_STATUS_FLAG (bool, has_acls)
   IMPLEMENT_STATUS_FLAG (bool, hasgood_inode)
   IMPLEMENT_STATUS_FLAG (bool, caseinsensitive)
diff --git a/winsup/cygwin/mount.cc b/winsup/cygwin/mount.cc
index 13ace6250438..9545d22e0768 100644
--- a/winsup/cygwin/mount.cc
+++ b/winsup/cygwin/mount.cc
@@ -523,8 +523,22 @@ fs_info::update (PUNICODE_STRING upath, HANDLE in_vol)
   caseinsensitive ((!(flags () & FILE_CASE_SENSITIVE_SEARCH) || is_samba ())
 		   && !is_nfs ());
 
+  /* Check for being an SSD */
+  if (!is_remote_drive () && !is_cdrom ())
+    {
+      /* Theoretically FileFsVolumeFlagsInformation would be sufficient,
+	 but apparently it's not exposed into userspace. */
+      FILE_FS_SECTOR_SIZE_INFORMATION ffssi;
+
+      status = NtQueryVolumeInformationFile (vol, &io, &ffssi, sizeof ffssi,
+					     FileFsSectorSizeInformation);
+      if (NT_SUCCESS (status))
+	is_ssd (!!(ffssi.Flags & SSINFO_FLAGS_NO_SEEK_PENALTY));
+    }
+
   if (!in_vol)
     NtClose (vol);
+
   fsi_cache.add (hash, this);
   return true;
 }