From 634081197460dd2051dcf156d02caf051273d02e Mon Sep 17 00:00:00 2001
From: Bill Zissimopoulos <billziss@navimatics.com>
Date: Wed, 21 Oct 2020 15:45:07 -0700
Subject: [PATCH] dll: fuse: fsp_fuse_notify: handle case-insensitive file
 systems

---
 inc/winfsp/winfsp.h | 12 ++++++++++++
 src/dll/fuse/fuse.c | 12 ++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/inc/winfsp/winfsp.h b/inc/winfsp/winfsp.h
index deb94fb3..06f77227 100644
--- a/inc/winfsp/winfsp.h
+++ b/inc/winfsp/winfsp.h
@@ -1229,6 +1229,18 @@ FSP_API NTSTATUS FspFileSystemNotifyEnd(FSP_FILE_SYSTEM *FileSystem);
  * first issue an FspFileSystemBegin call, followed by 0 or more
  * FspFileSystemNotify calls, followed by an FspFileSystemNotifyEnd call.
  *
+ * Note that FspFileSystemNotify requires file names to be normalized. A
+ * normalized file name is one that contains the correct case of all characters
+ * in the file name.
+ *
+ * For case-sensitive file systems all file names are normalized by definition.
+ * For case-insensitive file systems that implement file name normalization,
+ * a normalized file name is the one that the file system specifies in the
+ * response to Create or Open (see also FspFileSystemGetOpenFileInfo). For
+ * case-insensitive file systems that do not implement file name normalization
+ * a normalized file name is the upper case version of the file name used
+ * to open the file.
+ *
  * @param FileSystem
  *     The file system object.
  * @param NotifyInfo
diff --git a/src/dll/fuse/fuse.c b/src/dll/fuse/fuse.c
index dca5c8c2..e54f3e01 100644
--- a/src/dll/fuse/fuse.c
+++ b/src/dll/fuse/fuse.c
@@ -642,6 +642,18 @@ FSP_FUSE_API int fsp_fuse_notify(struct fsp_fuse_env *env,
     NotifyInfo.V.Action = 0;
     memcpy(NotifyInfo.V.FileNameBuf, Path, NotifyInfo.V.Size - sizeof(FSP_FSCTL_NOTIFY_INFO));
 
+    if (!f->VolumeParams.CaseSensitiveSearch)
+    {
+        /*
+         * Case-insensitive FUSE file systems do not normalize open file names, which means
+         * that the FSD automatically normalizes file names internally by uppercasing them.
+         *
+         * The FspFileSystemNotify API requires normalized names, so upper case the file name
+         * here in the case of case-insensitive file systems.
+         */
+        CharUpperBuffW(NotifyInfo.V.FileNameBuf, PathLength);
+    }
+
     if (action & FSP_FUSE_NOTIFY_MKDIR)
     {
         NotifyInfo.V.Filter = FILE_NOTIFY_CHANGE_DIR_NAME;