diff --git a/src/config.rs b/src/config.rs
index dd31430..0f9e11e 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -16,7 +16,25 @@ pub struct Config {
     pub base64: base64::Config,
     pub try_decode_base64: bool,
     pub read_only: bool,
+    pub input: Input,
     pub output: Output,
+    pub mount: Option<PathBuf>,
+    pub cleanup_mount: bool,
+}
+
+#[derive(Debug)]
+pub enum Input {
+    Stdin,
+    File(PathBuf),
+}
+
+impl std::fmt::Display for Input {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
+        match self {
+            Input::Stdin => write!(f, "<stdin>"),
+            Input::File(file) => write!(f, "{}", file.display()),
+        }
+    }
 }
 
 #[derive(Debug)]
@@ -68,7 +86,10 @@ impl Default for Config {
             base64: base64::STANDARD,
             try_decode_base64: false,
             read_only: false,
+            input: Input::Stdin,
             output: Output::Stdout,
+            mount: None,
+            cleanup_mount: false,
         }
     }
 }
diff --git a/src/main.rs b/src/main.rs
index e00cfdc..edb2b8c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,4 @@
-use std::path::Path;
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 
 use clap::{App, Arg};
 
@@ -11,7 +10,7 @@ mod config;
 mod format;
 mod fs;
 
-use config::{Config, Output};
+use config::{Config, Input, Output};
 use format::Format;
 
 use fuser::MountOption;
@@ -121,15 +120,16 @@ fn main() {
         )
         .arg(
             Arg::with_name("MOUNT")
-                .help("Sets the mountpoint")
-                .required(true)
-                .index(1),
+                .help("Sets the mountpoint; will be inferred when using a file, but must be specified when running on stdin")
+                .long("mount")
+                .short("m")
+                .takes_value(true)
         )
         .arg(
             Arg::with_name("INPUT")
                 .help("Sets the input file (defaults to '-', meaning STDIN)")
                 .default_value("-")
-                .index(2),
+                .index(1),
         )
         .get_matches();
 
@@ -193,13 +193,6 @@ fn main() {
         };
     }
 
-    // TODO 2021-06-08 infer and create mountpoint from filename as possible
-    let mount_point = Path::new(args.value_of("MOUNT").expect("mount point"));
-    if !mount_point.exists() {
-        error!("Mount point {} does not exist.", mount_point.display());
-        std::process::exit(1);
-    }
-
     match args.value_of("UID") {
         Some(uid_string) => match uid_string.parse() {
             Ok(uid) => config.uid = uid,
@@ -229,15 +222,32 @@ fn main() {
         None => config.gid = unsafe { libc::getegid() },
     }
 
-    let input_source = args.value_of("INPUT").expect("input source");
+    config.input = match args.value_of("INPUT") {
+        Some(input_source) => {
+            if input_source == "-" {
+                Input::Stdin
+            } else {
+                let input_source = PathBuf::from(input_source);
+                if !input_source.exists() {
+                    error!("Input file {} does not exist.", input_source.display());
+                    std::process::exit(1);
+                }
+                Input::File(input_source)
+            }
+        }
+        None => Input::Stdin,
+    };
     config.output = if let Some(output) = args.value_of("OUTPUT") {
         Output::File(PathBuf::from(output))
     } else if args.is_present("INPLACE") {
-        if input_source == "-" {
-            warn!("In-place output `-i` with STDIN input makes no sense; outputting on STDOUT.");
-            Output::Stdout
-        } else {
-            Output::File(PathBuf::from(input_source))
+        match &config.input {
+            Input::Stdin => {
+                warn!(
+                    "In-place output `-i` with STDIN input makes no sense; outputting on STDOUT."
+                );
+                Output::Stdout
+            }
+            Input::File(input_source) => Output::File(input_source.clone()),
         }
     } else if args.is_present("NOOUTPUT") || args.is_present("QUIET") {
         Output::Quiet
@@ -245,6 +255,54 @@ fn main() {
         Output::Stdout
     };
 
+    // infer and create mountpoint from filename as possible
+    config.mount = match args.value_of("MOUNT") {
+        Some(mount_point) => {
+            let mount_point = PathBuf::from(mount_point);
+            if !mount_point.exists() {
+                error!("Mount point {} does not exist.", mount_point.display());
+                std::process::exit(1);
+            }
+
+            config.cleanup_mount = false;
+            Some(mount_point)
+        }
+        None => {
+            match &config.input {
+                Input::Stdin => {
+                    error!("You must specify a mount point when reading from stdin.");
+                    std::process::exit(1);
+                }
+                Input::File(file) => {
+                    // If the input is from a file foo.EXT, then try to make a directory foo.
+                    let mount_dir = file.with_extension("");
+
+                    // If that file already exists, give up and tell the user about --mount.
+                    if mount_dir.exists() {
+                        error!("Inferred mountpoint '{mount}' for input file '{file}', but '{mount}' already exists. Use `--mount MOUNT` to specify a mountpoint.", 
+                            mount = mount_dir.display(), file = file.display());
+                        std::process::exit(1);
+                    }
+
+                    // If the mountpoint can't be created, give up and tell the user about --mount.
+                    if let Err(e) = std::fs::create_dir(&mount_dir) {
+                        error!(
+                            "Couldn't create mountpoint '{}': {}. Use `--mount MOUNT` to specify a mountpoint.",
+                            mount_dir.display(),
+                            e
+                        );
+                        std::process::exit(1);
+                    }
+
+                    // We did it!
+                    config.cleanup_mount = true;
+                    Some(mount_dir)
+                }
+            }
+        }
+    };
+    assert!(config.mount.is_some());
+
     // try to autodetect the input format.
     //
     // first see if it's specified and parses okay.
@@ -268,18 +326,23 @@ fn main() {
                 }
             };
 
-            match Path::new(input_source)
-                .extension() // will fail for STDIN, no worries
-                .map(|s| s.to_str().expect("utf8 filename").to_lowercase())
-            {
-                Some(s) => match s.parse::<Format>() {
+            match &config.input {
+                Input::Stdin => Format::Json,
+                Input::File(input_source) => match input_source
+                    .extension()
+                    .and_then(|s| s.to_str())
+                    .ok_or(format::ParseFormatError::NoFormatProvided)
+                    .and_then(|s| s.parse::<Format>())
+                {
                     Ok(format) => format,
                     Err(_) => {
-                        warn!("Unrecognized format {}, defaulting to JSON.", s);
+                        warn!(
+                            "Unrecognized format {}, defaulting to JSON.",
+                            input_source.display()
+                        );
                         Format::Json
                     }
                 },
-                None => Format::Json,
             }
         }
     };
@@ -330,7 +393,11 @@ fn main() {
         }
     };
 
-    let mut options = vec![MountOption::FSName(input_source.into())];
+    ////////////////////////////////////////////////////////////////////////////
+    // DONE PARSING
+    ////////////////////////////////////////////////////////////////////////////
+
+    let mut options = vec![MountOption::FSName(format!("{}", config.input))];
     if args.is_present("AUTOUNMOUNT") {
         options.push(MountOption::AutoUnmount);
     }
@@ -338,19 +405,45 @@ fn main() {
         options.push(MountOption::RO);
     }
 
-    let input_format = config.input_format;
-    let reader: Box<dyn std::io::Read> = if input_source == "-" {
-        Box::new(std::io::stdin())
-    } else {
-        let file = std::fs::File::open(input_source).unwrap_or_else(|e| {
-            error!("Unable to open {} for JSON input: {}", input_source, e);
+    assert!(config.mount.is_some());
+    let mount = match &config.mount {
+        Some(mount) => mount.clone(),
+        None => {
+            error!(
+                "No mount point specified; aborting. Use `--mount MOUNT` to specify a mountpoint."
+            );
             std::process::exit(1);
-        });
-        Box::new(file)
+        }
+    };
+    let cleanup_mount = config.cleanup_mount;
+    let input_format = config.input_format;
+    let reader: Box<dyn std::io::Read> = match &config.input {
+        Input::Stdin => Box::new(std::io::stdin()),
+        Input::File(file) => {
+            let fmt = config.input_format;
+            let file = std::fs::File::open(&file).unwrap_or_else(|e| {
+                error!("Unable to open {} for {} input: {}", file.display(), fmt, e);
+                std::process::exit(1);
+            });
+            Box::new(file)
+        }
     };
     let fs = input_format.load(reader, config);
 
-    info!("mounting on {:?} with options {:?}", mount_point, options);
-    fuser::mount2(fs, mount_point, &options).unwrap();
+    info!("mounting on {:?} with options {:?}", mount, options);
+    fuser::mount2(fs, &mount, &options).unwrap();
     info!("unmounted");
+
+    if cleanup_mount {
+        if mount.exists() {
+            if let Err(e) = std::fs::remove_dir(&mount) {
+                warn!("Unable to clean up mountpoint '{}': {}", mount.display(), e);
+            }
+        } else {
+            warn!(
+                "Mountpoint '{}' disappeared before ffs could cleanup.",
+                mount.display()
+            );
+        }
+    }
 }
diff --git a/tests/bad_root.sh b/tests/bad_root.sh
index ff8c1fd..b4b4906 100755
--- a/tests/bad_root.sh
+++ b/tests/bad_root.sh
@@ -15,7 +15,7 @@ MNT=$(mktemp -d)
 OUT=$(mktemp)
 MSG=$(mktemp)
 
-ffs "$MNT" ../json/null.json >"$OUT" 2>"$MSG" &
+ffs -m "$MNT" ../json/null.json >"$OUT" 2>"$MSG" &
 PID=$!
 sleep 1
 kill -0 $PID >/dev/null 2>&1 && fail process
diff --git a/tests/bad_root_stdin.sh b/tests/bad_root_stdin.sh
index 83c66fc..85fe479 100755
--- a/tests/bad_root_stdin.sh
+++ b/tests/bad_root_stdin.sh
@@ -15,7 +15,7 @@ MNT=$(mktemp -d)
 OUT=$(mktemp)
 MSG=$(mktemp)
 
-echo \"just a string\" | ffs "$MNT" >"$OUT" 2>"$MSG" &
+echo \"just a string\" | ffs -m "$MNT" >"$OUT" 2>"$MSG" &
 PID=$!
 sleep 1
 kill -0 $PID >/dev/null 2>&1 && fail process
diff --git a/tests/basic_list.sh b/tests/basic_list.sh
index 1dd3cae..c21a35a 100755
--- a/tests/basic_list.sh
+++ b/tests/basic_list.sh
@@ -13,7 +13,7 @@ fail() {
 
 MNT=$(mktemp -d)
 
-ffs "$MNT" ../json/list.json &
+ffs -m "$MNT" ../json/list.json &
 PID=$!
 sleep 2
 cd "$MNT"
diff --git a/tests/basic_object.sh b/tests/basic_object.sh
index 42d2049..16b81d6 100755
--- a/tests/basic_object.sh
+++ b/tests/basic_object.sh
@@ -13,7 +13,7 @@ fail() {
 
 MNT=$(mktemp -d)
 
-ffs "$MNT" ../json/object.json &
+ffs -m "$MNT" ../json/object.json &
 PID=$!
 sleep 2
 cd "$MNT"
diff --git a/tests/basic_object_exact.sh b/tests/basic_object_exact.sh
index 898dc41..cdc944b 100755
--- a/tests/basic_object_exact.sh
+++ b/tests/basic_object_exact.sh
@@ -22,7 +22,7 @@ printf "10"                >"${EXP}/fingernails"
 printf "true"              >"${EXP}/human"
 printf ""                  >"${EXP}/problems"
 
-ffs "$MNT" ../json/object_null.json &
+ffs -m "$MNT" ../json/object_null.json &
 PID=$!
 sleep 2
 cd "$MNT"
diff --git a/tests/basic_object_newline.sh b/tests/basic_object_newline.sh
index c1d0195..ec44c34 100755
--- a/tests/basic_object_newline.sh
+++ b/tests/basic_object_newline.sh
@@ -22,7 +22,7 @@ printf "10\n"                >"${EXP}/fingernails"
 printf "true\n"              >"${EXP}/human"
 printf ""                    >"${EXP}/problems"
 
-ffs --newline "$MNT" ../json/object_null.json &
+ffs --newline -m "$MNT" ../json/object_null.json &
 PID=$!
 sleep 2
 cd "$MNT"
diff --git a/tests/basic_object_stdin.sh b/tests/basic_object_stdin.sh
index c9e0ae7..1fb4863 100755
--- a/tests/basic_object_stdin.sh
+++ b/tests/basic_object_stdin.sh
@@ -13,7 +13,7 @@ fail() {
 
 MNT=$(mktemp -d)
 
-cat ../json/object.json | ffs "$MNT" &
+cat ../json/object.json | ffs -m "$MNT" &
 PID=$!
 sleep 2
 cd "$MNT"
diff --git a/tests/basic_toml.sh b/tests/basic_toml.sh
index a2fffdf..055f3c6 100755
--- a/tests/basic_toml.sh
+++ b/tests/basic_toml.sh
@@ -13,7 +13,7 @@ fail() {
 
 MNT=$(mktemp -d)
 
-ffs "$MNT" ../toml/eg.toml &
+ffs -m "$MNT" ../toml/eg.toml &
 PID=$!
 sleep 2
 case $(ls "$MNT") in
diff --git a/tests/binary.sh b/tests/binary.sh
index 391be90..f064b30 100755
--- a/tests/binary.sh
+++ b/tests/binary.sh
@@ -30,7 +30,7 @@ MNT=$(mktemp -d)
 TGT=$(mktemp)
 TGT2=$(mktemp)
 
-ffs "$MNT" ../json/object.json >"$TGT" &
+ffs -m "$MNT" ../json/object.json >"$TGT" &
 PID=$!
 sleep 2
 cp ../binary/twitter.ico "$MNT"/favicon
@@ -42,7 +42,7 @@ kill -0 $PID >/dev/null 2>&1 && fail process1
 [ -f "$TGT" ] || fail output1
 [ -s "$TGT" ] || fail output2
 grep favicon "$TGT" >/dev/null 2>&1 || fail text
-ffs --no-output "$MNT" "$TGT" >"$TGT2" &
+ffs --no-output -m "$MNT" "$TGT" >"$TGT2" &
 PID=$!
 sleep 2
 
diff --git a/tests/chmod.sh b/tests/chmod.sh
index 223115f..8b29eab 100755
--- a/tests/chmod.sh
+++ b/tests/chmod.sh
@@ -17,7 +17,7 @@ MNT=$(mktemp -d)
 TGT=$(mktemp)
 TGT2=$(mktemp)
 
-ffs "$MNT" ../json/object.json >"$TGT" &
+ffs -m "$MNT" ../json/object.json >"$TGT" &
 PID=$!
 sleep 2
 echo 'echo hi' >"$MNT"/script
@@ -31,7 +31,7 @@ kill -0 $PID >/dev/null 2>&1 && fail process1
 [ -f "$TGT" ] || fail output1
 [ -s "$TGT" ] || fail output2
 grep -e echo "$TGT" >/dev/null 2>&1 || fail grep
-ffs --no-output --source json "$MNT" "$TGT" >"$TGT2" &
+ffs --no-output --source json -m "$MNT" "$TGT" >"$TGT2" &
 PID=$!
 sleep 2
 
diff --git a/tests/chown.sh b/tests/chown.sh
index 7bd7afd..9b27d54 100755
--- a/tests/chown.sh
+++ b/tests/chown.sh
@@ -15,14 +15,11 @@ fail() {
 MNT=$(mktemp -d)
 ERR=$(mktemp)
 
-RUST_LOG="ffs=debug" ffs -d --no-output "$MNT" ../json/object.json &
+ffs -d --no-output -m "$MNT" ../json/object.json &
 PID=$!
 sleep 2
 chown :nobody "$MNT"/name 2>$ERR >&2 && fail "chgrp1: $(cat $ERR)"
 [ -s "$ERR" ] || fail "chgrp1 error: $(cat $ERR)"
-groups
-ls -l "$MNT"/name
-echo $(groups | cut -d' ' -f 1)
 chown :$(groups | cut -d' ' -f 1) "$MNT"/name 2>$ERR >&2 || fail "chgrp2: $(cat $ERR)"
 [ -s "$ERR" ] && fail "chgrp2 error: $(cat $ERR)"
 chown $(whoami) "$MNT"/name 2>$ERR >&2 || fail chown
diff --git a/tests/exact_cleanup.sh b/tests/exact_cleanup.sh
index a865ad7..b5a4f80 100755
--- a/tests/exact_cleanup.sh
+++ b/tests/exact_cleanup.sh
@@ -25,7 +25,7 @@ printf "true"              >"${EXP}/human"
 printf "hi\n"              >"${EXP}/greeting"
 printf "bye"               >"${EXP}/farewell"
 
-ffs -o "$JSON" "$MNT" ../json/object.json &
+ffs -o "$JSON" -m "$MNT" ../json/object.json &
 PID=$!
 sleep 2
 echo hi >"$MNT"/greeting
@@ -35,7 +35,7 @@ sleep 1
 kill -0 $PID >/dev/null 2>&1 && fail process
 
 # remount w/o --newline, confirm that they're not there (except for greeting)
-ffs "$MNT" "$JSON" &
+ffs -m "$MNT" "$JSON" &
 sleep 2
 case $(ls "$MNT") in
     (eyes*farewell*fingernails*greeting*human*name) ;;
diff --git a/tests/file_creation.sh b/tests/file_creation.sh
index 5123654..fa9c9a7 100755
--- a/tests/file_creation.sh
+++ b/tests/file_creation.sh
@@ -13,7 +13,7 @@ fail() {
 
 MNT=$(mktemp -d)
 
-ffs "$MNT" ../json/object.json &
+ffs -m "$MNT" ../json/object.json &
 PID=$!
 sleep 2
 cd "$MNT"
diff --git a/tests/force_uid_gid.sh b/tests/force_uid_gid.sh
index ed1b217..910f12d 100755
--- a/tests/force_uid_gid.sh
+++ b/tests/force_uid_gid.sh
@@ -13,7 +13,7 @@ fail() {
 
 MNT=$(mktemp -d)
 
-ffs --uid $(id -u root) --gid $(id -g root) "$MNT" ../json/object.json &
+ffs --uid $(id -u root) --gid $(id -g root) -m "$MNT" ../json/object.json &
 PID=$!
 sleep 2
 ls -l "$MNT" | grep root >/dev/null 2>&1 || fail user
diff --git a/tests/infer_mount.sh b/tests/infer_mount.sh
new file mode 100755
index 0000000..0ee2ce8
--- /dev/null
+++ b/tests/infer_mount.sh
@@ -0,0 +1,37 @@
+#!/bin/sh
+
+fail() {
+    echo FAILED: $1
+    if [ "$MNT" ]
+    then
+        cd
+        umount "$TMP"/object
+        rm -r "$TMP"
+    fi
+    exit 1
+}
+
+TMP=$(mktemp -d)
+
+cp ../json/object.json "$TMP"
+cd "$TMP"
+ffs object.json &
+PID=$!
+sleep 2
+[ -d "object" ] || fail mountdir
+case $(ls object) in
+    (eyes*fingernails*human*name) ;;
+    (*) fail ls;;
+esac
+[ "$(cat object/name)" = "Michael Greenberg" ] || fail name
+[ "$(cat object/eyes)" -eq 2 ] || fail eyes
+[ "$(cat object/fingernails)" -eq 10 ] || fail fingernails
+[ "$(cat object/human)" = "true" ] || fail human
+umount object || fail unmount
+sleep 1
+
+kill -0 $PID >/dev/null 2>&1 && fail process
+
+[ -d "object" ] && fail cleanup
+cd -
+rm -r "$TMP"
diff --git a/tests/json_to_toml.sh b/tests/json_to_toml.sh
index 95aecc9..87d2f50 100755
--- a/tests/json_to_toml.sh
+++ b/tests/json_to_toml.sh
@@ -15,7 +15,7 @@ fail() {
 MNT=$(mktemp -d)
 TGT=$(mktemp)
 
-ffs --source json --target toml -o "$TGT" "$MNT" ../json/single.json &
+ffs --source json --target toml -o "$TGT" -m "$MNT" ../json/single.json &
 PID=$!
 sleep 2
 umount "$MNT" || fail unmount1    
diff --git a/tests/mode.sh b/tests/mode.sh
index 93ca3b7..b04353b 100755
--- a/tests/mode.sh
+++ b/tests/mode.sh
@@ -15,7 +15,7 @@ MNT=$(mktemp -d)
 
 umask 022
 
-ffs --mode 666 "$MNT" ../json/object.json &
+ffs --mode 666 -m "$MNT" ../json/object.json &
 PID=$!
 sleep 2
 cd "$MNT"
@@ -28,7 +28,7 @@ sleep 1
 kill -0 $PID >/dev/null 2>&1 && fail process1
 
 umask 077
-ffs --mode 666 --dirmode 700 "$MNT" ../json/object.json &
+ffs --mode 666 --dirmode 700 -m "$MNT" ../json/object.json &
 PID=$!
 sleep 2
 cd "$MNT"
diff --git a/tests/newline_cleanup.sh b/tests/newline_cleanup.sh
index d3aa98f..76d2dba 100755
--- a/tests/newline_cleanup.sh
+++ b/tests/newline_cleanup.sh
@@ -25,7 +25,7 @@ printf "true"              >"${EXP}/human"
 printf "hi"                >"${EXP}/greeting"
 printf "bye"               >"${EXP}/farewell"
 
-ffs --newline -o "$JSON" "$MNT" ../json/object.json &
+ffs --newline -o "$JSON" -m "$MNT" ../json/object.json &
 PID=$!
 sleep 2
 echo hi >"$MNT"/greeting
@@ -35,7 +35,7 @@ sleep 1
 kill -0 $PID >/dev/null 2>&1 && fail process
 
 # remount w/o --newline, confirm that they're not there
-ffs "$MNT" "$JSON" &
+ffs -m "$MNT" "$JSON" &
 sleep 2
 case $(ls "$MNT") in
     (eyes*farewell*fingernails*greeting*human*name) ;;
diff --git a/tests/nlink.sh b/tests/nlink.sh
index 1f1f0d6..b18e5b1 100755
--- a/tests/nlink.sh
+++ b/tests/nlink.sh
@@ -25,7 +25,7 @@ fi
 
 MNT=$(mktemp -d)
 
-ffs "$MNT" ../json/nlink.json &
+ffs -m "$MNT" ../json/nlink.json &
 PID=$!
 sleep 2
 cd "$MNT"
diff --git a/tests/output.sh b/tests/output.sh
index fefc91d..434d27a 100755
--- a/tests/output.sh
+++ b/tests/output.sh
@@ -17,7 +17,7 @@ MNT=$(mktemp -d)
 TGT=$(mktemp)
 TGT2=$(mktemp)
 
-ffs "$MNT" ../json/object.json >"$TGT" &
+ffs -m "$MNT" ../json/object.json >"$TGT" &
 PID=$!
 sleep 2
 mkdir "$MNT"/pockets
@@ -38,7 +38,7 @@ kill -0 $PID >/dev/null 2>&1 && fail process1
 [ -s "$TGT" ] || fail output2
 cat "$TGT"
 stat "$TGT"
-ffs --no-output "$MNT" "$TGT" >"$TGT2" &
+ffs --no-output -m "$MNT" "$TGT" >"$TGT2" &
 PID=$!
 sleep 2
 
diff --git a/tests/override_infer.sh b/tests/override_infer.sh
index b667c04..1612965 100755
--- a/tests/override_infer.sh
+++ b/tests/override_infer.sh
@@ -18,7 +18,7 @@ TGT=$(mktemp)
 
 cp ../toml/single.toml "$SRC"
 
-ffs --source toml --target json -o "$TGT" "$MNT" "$SRC" &
+ffs --source toml --target json -o "$TGT" -m "$MNT" "$SRC" &
 PID=$!
 sleep 2
 umount "$MNT" || fail unmount1    
diff --git a/tests/pad_list.sh b/tests/pad_list.sh
index 34505b8..37f71ca 100755
--- a/tests/pad_list.sh
+++ b/tests/pad_list.sh
@@ -13,7 +13,7 @@ fail() {
 
 MNT=$(mktemp -d)
 
-ffs "$MNT" ../json/list2.json &
+ffs -m "$MNT" ../json/list2.json &
 PID=$!
 sleep 2
 cd "$MNT"
diff --git a/tests/quiet_inplace.sh b/tests/quiet_inplace.sh
index bb47b00..925f94b 100755
--- a/tests/quiet_inplace.sh
+++ b/tests/quiet_inplace.sh
@@ -16,7 +16,7 @@ JSON=$(mktemp)
 
 cp ../json/object.json "$JSON"
 
-ffs -qi "$MNT" "$JSON" &
+ffs -qi -m "$MNT" "$JSON" &
 PID=$!
 sleep 2
 echo hi >"$MNT"/greeting
@@ -27,7 +27,7 @@ kill -0 $PID >/dev/null 2>&1 && fail process1
 
 diff ../json/object.json "$JSON" >/dev/null && fail same
 
-ffs --readonly "$MNT" "$JSON" &
+ffs --readonly -m "$MNT" "$JSON" &
 PID=$!
 sleep 2
 [ "$(cat $MNT/greeting)" = "hi" ] || fail updated
diff --git a/tests/read_only.sh b/tests/read_only.sh
index 343ef9f..d1b2eab 100755
--- a/tests/read_only.sh
+++ b/tests/read_only.sh
@@ -13,7 +13,7 @@ fail() {
 
 MNT=$(mktemp -d)
 
-ffs --readonly "$MNT" ../json/object.json &
+ffs --readonly -m "$MNT" ../json/object.json &
 PID=$!
 sleep 2
 cd "$MNT"
diff --git a/tests/rename.sh b/tests/rename.sh
index d35cdbb..0b50799 100755
--- a/tests/rename.sh
+++ b/tests/rename.sh
@@ -13,7 +13,7 @@ fail() {
 
 MNT=$(mktemp -d)
 
-ffs "$MNT" ../json/object.json &
+ffs -m "$MNT" ../json/object.json &
 PID=$!
 sleep 2
 cd "$MNT"
diff --git a/tests/rename_object.sh b/tests/rename_object.sh
index 8fc2ef7..43d9fb6 100755
--- a/tests/rename_object.sh
+++ b/tests/rename_object.sh
@@ -13,7 +13,7 @@ fail() {
 
 MNT=$(mktemp -d)
 
-ffs "$MNT" ../json/obj_rename.json &
+ffs -m "$MNT" ../json/obj_rename.json &
 PID=$!
 sleep 2
 cd "$MNT"
diff --git a/tests/rmdir.sh b/tests/rmdir.sh
index 600b409..ce55fd6 100755
--- a/tests/rmdir.sh
+++ b/tests/rmdir.sh
@@ -13,7 +13,7 @@ fail() {
 
 MNT=$(mktemp -d)
 
-ffs "$MNT" ../json/object.json &
+ffs -m "$MNT" ../json/object.json &
 PID=$!
 sleep 2
 cd "$MNT"
diff --git a/tests/toml_output.sh b/tests/toml_output.sh
index 55802dc..ca2744e 100755
--- a/tests/toml_output.sh
+++ b/tests/toml_output.sh
@@ -20,7 +20,7 @@ TOML="$TOML".toml
 
 cp ../toml/eg.toml "$TOML"
 
-ffs -i "$MNT" "$TOML" &
+ffs -i -m "$MNT" "$TOML" &
 PID=$!
 sleep 2
 case $(ls "$MNT") in
@@ -35,7 +35,7 @@ umount "$MNT" || fail unmount1
 sleep 1
 kill -0 $PID >/dev/null 2>&1 && fail process1
 
-ffs --readonly --no-output "$MNT" "$TOML" &
+ffs --readonly --no-output -m "$MNT" "$TOML" &
 PID=$!
 sleep 2
 [ "$(cat $MNT/clients/hosts/0)" = "alpha" ] || fail hosts0
diff --git a/tests/toml_to_json.sh b/tests/toml_to_json.sh
index 9f42f6a..4128432 100755
--- a/tests/toml_to_json.sh
+++ b/tests/toml_to_json.sh
@@ -15,7 +15,7 @@ fail() {
 MNT=$(mktemp -d)
 TGT=$(mktemp)
 
-ffs --source toml --target json -o "$TGT" "$MNT" ../toml/single.toml &
+ffs --source toml --target json -o "$TGT" -m "$MNT" ../toml/single.toml &
 PID=$!
 sleep 2
 umount "$MNT" || fail unmount1    
diff --git a/tests/touch.sh b/tests/touch.sh
index b1864c3..127828b 100755
--- a/tests/touch.sh
+++ b/tests/touch.sh
@@ -15,7 +15,7 @@ fail() {
 MNT=$(mktemp -d)
 ERR=$(mktemp)
 
-ffs --no-output "$MNT" ../json/object.json &
+ffs --no-output -m "$MNT" ../json/object.json &
 PID=$!
 sleep 2
 touch "$MNT"/name 2>$ERR >&2 || { cat "$ERR"; fail touch; }
diff --git a/tests/truncate.sh b/tests/truncate.sh
index 99cc600..28e66af 100755
--- a/tests/truncate.sh
+++ b/tests/truncate.sh
@@ -19,7 +19,7 @@ TGT=$(mktemp)
 TGT2=$(mktemp)
 ERR=$(mktemp)
 
-ffs "$MNT" ../json/object.json >"$TGT" &
+ffs -m "$MNT" ../json/object.json >"$TGT" &
 PID=$!
 sleep 2
 echo 'Mikey Indiana' >"$MNT"/name 2>"$ERR"
@@ -32,7 +32,7 @@ kill -0 $PID >/dev/null 2>&1 && fail process1
 [ -f "$TGT" ] || fail output1
 [ -s "$TGT" ] || fail output2
 grep -e Indiana "$TGT" >/dev/null 2>&1 || fail grep
-ffs --no-output --source json "$MNT" "$TGT" >"$TGT2" &
+ffs --no-output --source json -m "$MNT" "$TGT" >"$TGT2" &
 PID=$!
 sleep 2
 
diff --git a/tests/unlink.sh b/tests/unlink.sh
index e25f329..6022950 100755
--- a/tests/unlink.sh
+++ b/tests/unlink.sh
@@ -13,7 +13,7 @@ fail() {
 
 MNT=$(mktemp -d)
 
-ffs "$MNT" ../json/object.json &
+ffs -m "$MNT" ../json/object.json &
 PID=$!
 sleep 2
 cd "$MNT"
diff --git a/tests/unpadded_list.sh b/tests/unpadded_list.sh
index bd6cb91..3fa5f87 100755
--- a/tests/unpadded_list.sh
+++ b/tests/unpadded_list.sh
@@ -13,7 +13,7 @@ fail() {
 
 MNT=$(mktemp -d)
 
-ffs --unpadded "$MNT" ../json/list2.json &
+ffs --unpadded -m "$MNT" ../json/list2.json &
 PID=$!
 sleep 2
 cd "$MNT"
diff --git a/tests/write.sh b/tests/write.sh
index ffa17e9..f468803 100755
--- a/tests/write.sh
+++ b/tests/write.sh
@@ -20,7 +20,7 @@ hi
 hello
 EOF
 
-ffs "$MNT" ../json/list.json &
+ffs -m "$MNT" ../json/list.json &
 PID=$!
 sleep 2
 cd "$MNT"
diff --git a/tests/yaml_output.sh b/tests/yaml_output.sh
index dc2e92c..2bd859b 100755
--- a/tests/yaml_output.sh
+++ b/tests/yaml_output.sh
@@ -20,7 +20,7 @@ YAML="$YAML".yaml
 
 cp ../yaml/invoice.yaml "$YAML"
 
-ffs -i "$MNT" "$YAML" &
+ffs -i -m "$MNT" "$YAML" &
 PID=$!
 sleep 2
 case $(ls "$MNT") in
@@ -35,7 +35,7 @@ umount "$MNT" || fail unmount1
 sleep 1
 kill -0 $PID >/dev/null 2>&1 && fail process1
 
-ffs --readonly --no-output "$MNT" "$YAML" &
+ffs --readonly --no-output -m "$MNT" "$YAML" &
 PID=$!
 sleep 2
 [ "$(cat $MNT/product/0/description)" = "Basketball" ] || fail desc1