Makefile

@@ -14,8 +14,8 @@ else
 endif
 
 image.bin:
-	dd if=/dev/zero of=image.bin bs=1048576 count=1024
 	cargo build --release --bin redoxfs-mkfs
+	dd if=/dev/zero of=image.bin bs=1048576 count=1024
 	target/release/redoxfs-mkfs image.bin
 
 mount: image.bin FORCE

src/dir.rs

 use alloc::{boxed::Box, vec};
 use core::{mem, ops, slice, str};
 
-use crate::{BlockLevel, BlockTrait, Node, TreePtr, RECORD_LEVEL};
+use crate::{BlockLevel, BlockTrait, Node, TreePtr, RECORD_LEVEL, DIR_ENTRY_MAX_LENGTH};
 
 #[repr(packed)]
 pub struct DirEntry {
     node_ptr: TreePtr<Node>,
-    name: [u8; 252],
+    name: [u8; DIR_ENTRY_MAX_LENGTH],
 }
 
 impl DirEntry {
-    pub fn new(node_ptr: TreePtr<Node>, name: &str) -> Option<DirEntry> {
+    pub fn new(node_ptr: TreePtr<Node>, name: &str) -> DirEntry {
         let mut entry = DirEntry {
             node_ptr,
             ..Default::default()
         };
 
-        if name.len() > entry.name.len() {
-            return None;
-        }
-
         entry.name[..name.len()].copy_from_slice(name.as_bytes());
 
-        Some(entry)
+        entry
     }
 
     pub fn node_ptr(&self) -> TreePtr<Node> {
@@ -54,7 +50,7 @@ impl Default for DirEntry {
     fn default() -> Self {
         Self {
             node_ptr: TreePtr::default(),
-            name: [0; 252],
+            name: [0; DIR_ENTRY_MAX_LENGTH],
         }
     }
 }

src/lib.rs

@@ -14,6 +14,8 @@ pub const RECORD_LEVEL: usize = 5;
 pub const RECORD_SIZE: u64 = BLOCK_SIZE << RECORD_LEVEL;
 pub const SIGNATURE: &[u8; 8] = b"RedoxFS\0";
 pub const VERSION: u64 = 6;
+pub const DIR_ENTRY_MAX_LENGTH: usize = 252;
+
 pub static IS_UMT: AtomicUsize = AtomicUsize::new(0);
 
 pub use self::allocator::{AllocEntry, AllocList, Allocator, ALLOC_LIST_ENTRIES};

src/transaction.rs

@@ -12,11 +12,7 @@ use syscall::error::{
     Error, Result, EEXIST, EINVAL, EIO, EISDIR, ENOENT, ENOSPC, ENOTDIR, ENOTEMPTY, ERANGE,
 };
 
-use crate::{
-    AllocEntry, AllocList, Allocator, BlockAddr, BlockData, BlockLevel, BlockPtr, BlockTrait,
-    DirEntry, DirList, Disk, FileSystem, Header, Node, NodeLevel, RecordRaw, TreeData, TreePtr,
-    ALLOC_LIST_ENTRIES, HEADER_RING,
-};
+use crate::{AllocEntry, AllocList, Allocator, BlockAddr, BlockData, BlockLevel, BlockPtr, BlockTrait, DirEntry, DirList, Disk, FileSystem, Header, Node, NodeLevel, RecordRaw, TreeData, TreePtr, ALLOC_LIST_ENTRIES, HEADER_RING, DIR_ENTRY_MAX_LENGTH};
 
 pub struct Transaction<'a, D: Disk> {
     fs: &'a mut FileSystem<D>,
@@ -605,13 +601,11 @@ impl<'a, D: Disk> Transaction<'a, D> {
         name: &str,
         node_ptr: TreePtr<Node>,
     ) -> Result<()> {
-        if name.contains(':') {
-            return Err(Error::new(EINVAL));
-        }
+       if let Err(err)  = self.check_name(&parent_ptr, &name){
+           return Err(err);
+       }
 
-        if self.find_node(parent_ptr, name).is_ok() {
-            return Err(Error::new(EEXIST));
-        }
+        let entry = DirEntry::new(node_ptr, name);
 
         let mut parent = self.read_tree(parent_ptr)?;
 
@@ -619,8 +613,6 @@ impl<'a, D: Disk> Transaction<'a, D> {
         let links = node.data().links();
         node.data_mut().set_links(links + 1);
 
-        let entry = DirEntry::new(node_ptr, name).ok_or(Error::new(EINVAL))?;
-
         let record_level = parent.data().record_level();
         let record_end = parent.data().size() / record_level.bytes();
         for record_offset in 0..record_end {
@@ -795,6 +787,24 @@ impl<'a, D: Disk> Transaction<'a, D> {
         Ok(())
     }
 
+    fn check_name(&mut self,
+                  parent_ptr: &TreePtr<Node>,
+                  name: &str) -> Result<()> {
+        if name.contains(':') {
+            return Err(Error::new(EINVAL));
+        }
+
+        if name.len() > DIR_ENTRY_MAX_LENGTH {
+            return Err(Error::new(EINVAL));
+        }
+
+        if self.find_node(parent_ptr.clone(), name).is_ok() {
+            return Err(Error::new(EEXIST));
+        }
+
+        Ok(())
+    }
+
     fn node_record_ptr(
         &mut self,
         node: &TreeData<Node>,