Add creat function call. Fix direntry iteration in EXT2. Fix open of directories in EXT2. Fix re-utilization of unlinked direntries in EXT2.

mentos/inc/fs/ext2.h

@@ -15,3 +15,5 @@ int ext2_initialize();
 /// @brief De-initializes the EXT2 drivers.
 /// @return 0 on success, 1 on error.
 int ext2_finalize();
+
+void ext2_test();

mentos/inc/fs/vfs.h

@@ -112,6 +112,14 @@ int vfs_mkdir(const char *path, mode_t mode);
 /// @return Returns a negative value on failure.
 int vfs_rmdir(const char *path);
 
+/// @brief Creates a new file or rewrite an existing one.
+/// @param path path to the file.
+/// @param mode mode for file creation.
+/// @return file descriptor number, -1 otherwise and errno is set to indicate the error.
+/// @details
+/// It is equivalent to: open(path, O_WRONLY|O_CREAT|O_TRUNC, mode)
+vfs_file_t *vfs_creat(const char *path, mode_t mode);
+
 /// @brief Stat the file at the given path.
 /// @param path Path to the file for which we are retrieving the statistics.
 /// @param buf  Buffer where we are storing the statistics.

mentos/inc/fs/vfs_types.h

@@ -23,6 +23,8 @@ typedef struct vfs_file_t vfs_file_t;
 typedef int (*vfs_mkdir_callback)(const char *, mode_t);
 /// Function used to remove a directory.
 typedef int (*vfs_rmdir_callback)(const char *);
+/// Function used to open a file (or directory).
+typedef vfs_file_t *(*vfs_creat_callback)(const char *, mode_t);
 /// Function used to read the entries of a directory.
 typedef int (*vfs_getdents_callback)(vfs_file_t *, dirent_t *, off_t, size_t);
 /// Function used to open a file (or directory).
@@ -62,6 +64,8 @@ typedef struct vfs_sys_operations_t {
     vfs_rmdir_callback rmdir_f;
     /// Stat function.
     vfs_stat_callback stat_f;
+    /// File creation function.
+    vfs_creat_callback creat_f;
 } vfs_sys_operations_t;
 
 /// @brief Set of functions used to perform operations on files.

mentos/inc/system/syscall.h

@@ -208,6 +208,14 @@ int sys_mkdir(const char *path, mode_t mode);
 /// @return Returns a negative value on failure.
 int sys_rmdir(const char *path);
 
+/// @brief Creates a new file or rewrite an existing one.
+/// @param path path to the file.
+/// @param mode mode for file creation.
+/// @return file descriptor number, -1 otherwise and errno is set to indicate the error.
+/// @details
+/// It is equivalent to: open(path, O_WRONLY|O_CREAT|O_TRUNC, mode)
+int sys_creat(const char *path, mode_t mode);
+
 /// Provide access to the directory entries.
 /// @param fd    The file descriptor of the directory for which we accessing
 ///              the entries.