add "bkey-type" option to list command

Only bkeys of the specified type will be printed.

Signed-off-by: Thomas Bertschinger <tahbertschinger@gmail.com>

bch_bindgen/src/lib.rs

@@ -106,6 +106,34 @@ impl FromStr for c::btree_id {
     }
 }
 
+#[derive(Debug)]
+pub struct InvalidBkeyType;
+
+impl fmt::Display for InvalidBkeyType {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "invalid bkey type")
+    }
+}
+
+impl Error for InvalidBkeyType {
+}
+
+impl FromStr for c::bch_bkey_type {
+    type Err = InvalidBkeyType;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let s = CString::new(s).unwrap();
+        let p = s.as_ptr();
+
+        let v = unsafe {c::match_string(c::bch2_bkey_types[..].as_ptr(), (-(1 as isize)) as usize, p)};
+        if v >= 0 {
+            Ok(unsafe { std::mem::transmute(v) })
+        } else {
+            Err(InvalidBkeyType)
+        }
+    }
+}
+
 impl c::printbuf {
     fn new() -> c::printbuf {
         let mut buf: c::printbuf = Default::default();

src/commands/list.rs

@@ -21,7 +21,18 @@ fn list_keys(fs: &Fs, opt: Cli) -> anyhow::Result<()> {
             break;
         }
 
+        match opt.bkey_type {
+            Some(ty) => {
+                if k.k.type_ != ty as u8 {
+                    iter.advance();
+                    continue;
+                }
+            }
+            _ => {}
+        };
+
         println!("{}", k.to_text(fs));
+
         iter.advance();
     }
 
@@ -97,6 +108,10 @@ pub struct Cli {
     #[arg(short, long, default_value_t=bcachefs::btree_id::BTREE_ID_extents)]
     btree:      bcachefs::btree_id,
 
+    /// Bkey type to list
+    #[arg(short='k', long)]
+    bkey_type:      Option<bcachefs::bch_bkey_type>,
+
     /// Btree depth to descend to (0 == leaves)
     #[arg(short, long, default_value_t=0)]
     level:      u32,