[rfuse3]: update offset comparison in minimal filesystem example and improve test cleanup

- Changed the offset comparison in the minimal filesystem example to use u64 for consistency.
- Enhanced the test script to use a more reliable method for checking if the mount point is active and added a cleanup trap for better resource management.

Signed-off-by: LangQi99 <[email protected]>

Author: LangQi99

project/rfuse3/examples/minimal_filesystem_example.rs

@@ -225,7 +225,7 @@ impl Filesystem for MinimalFileSystem {
 
             let filtered: Vec<_> = entries
                 .into_iter()
-                .filter(|entry| entry.offset > offset as i64)
+                .filter(|entry| (entry.offset as u64) > offset)
                 .map(Ok)
                 .collect();
 

project/rfuse3/tests/minimal_filesystem_test.sh

@@ -11,7 +11,7 @@ CRATE_DIR=$(cd "$SCRIPT_DIR/.." && pwd)
 echo "Testing minimal filesystem example..."
 
 # Clean up any existing mount point
-if mountpoint -q "$MOUNTPOINT" 2>/dev/null; then
+if mount | grep -q " on $MOUNTPOINT "; then
     echo "Unmounting existing mount point..."
     umount "$MOUNTPOINT" || true
 fi
@@ -28,6 +28,9 @@ echo "Starting filesystem at $MOUNTPOINT..."
 cargo run --example minimal_filesystem_example -- --mountpoint "$MOUNTPOINT" &
 FS_PID=$!
 
+# Set up cleanup trap
+trap "kill $FS_PID 2>/dev/null || true; umount $MOUNTPOINT 2>/dev/null || true; rmdir $MOUNTPOINT 2>/dev/null || true" EXIT
+
 # Wait for filesystem to be ready
 sleep 2
 
@@ -43,11 +46,4 @@ cat "$MOUNTPOINT/hello.txt"
 echo "Testing file statistics..."
 stat "$MOUNTPOINT"
 
-# Clean up
-echo "Cleaning up..."
-kill $FS_PID 2>/dev/null || true
-sleep 1
-umount "$MOUNTPOINT" 2>/dev/null || true
-rmdir "$MOUNTPOINT" 2>/dev/null || true
-
 echo "Test completed successfully!"