wip

core/fs.c

@@ -1,13 +1,27 @@
 #include "fs.h"
+#include "list.h"
+#include "stddef.h"
+
+// List of all fs supported (e.g. EXT4, FAT32 ...)
+struct file_system *fsList = NULL;
+
+
+int fsRegister(struct file_system *fs){
+    list_add_tail(fsList, fs);
+
+    return 0;
+}
 
 int fsInodeUnref(struct inode *inode)
 {
+    //TODO
     (void)inode;
     return 0;
 };
 
 int fsInodeRef(struct inode *inode)
 {
+    //TODO
     (void)inode;
     return 0;
 };

core/fs.h

@@ -1,7 +1,154 @@
 #pragma once
+#include "fsEntry.h"
+#include "process.h"
+#include "stdint.h"
+#include "types.h"
+#include <stddef.h>
+#include <stdint.h>
 
+#define FS_NAME_MAXLEN 32
 
-struct inode {//TODO
+// Forward declaration
+struct file_system;
+struct file_system_instance;
+struct fs_stat;
+struct file;
+
+typedef enum {
+    FS_INODE_REGULAR_FILE = 0x01,
+    FS_INODE_DIRECTORY    = 0x02,
+    FS_INODE_SYMLINK      = 0x04,
+    FS_INODE_DEVICE_CHAR  = 0x08,
+    FS_INODE_DEVICE_BLOCK = 0x10
+} fs_inode_type_t;
+
+struct inode_operation {
 };
+
+/**
+ * Represent a file on the disk
+ */
+struct inode {
+    struct file_system_instance *fs;
+
+    uint64_t location;
+    size_t onDiskRef;
+    size_t inMemRef;
+    fs_inode_type_t type;
+
+#define FS_READABLE 00400
+#define FS_WRITABLE 00200
+#define FS_EXECUTABLE 00100
+    uint32_t mode;
+
+    bool_t dirty;
+    struct inode_operation *ops;
+
+    union {
+        struct inode_dir_ops *opsDir;
+        struct inode_dir_symlink *opsSymlink;
+    };
+
+    int (*destructor)(struct inode *this);
+    int (*newOpenedFile)(struct inode *this, const struct process *owner, uint32_t openFlags,
+                         struct file **result);
+    int (*closeOpenedFile)(struct inode *this, struct file *of);
+    void *custom;
+
+    struct inode *prevDirty, *nextDirty;
+};
+
+struct file_system_instance_ops { // super_operations
+    // From the inode location, instantiace a struct inode
+    int (*getInodeFromDevice)(struct file_system_instance *this, uint64_t storageLocation,
+                              struct inode **result);
+
+    int (*allocateNewInode)(struct file_system_instance *this, fs_inode_type_t type,
+                            const struct process *creator, uint32_t accessRights,
+                            uint32_t open_creat_flags, struct inode **result);
+
+    int (*statfs)(struct file_system_instance *this, struct fs_stat *result);
+};
+
+struct file_system_instance {
+
+    struct file_system *fsType; // this instance is of this type of file_system
+    struct inode *device; // device (like block one) could have a disk associated
+
+#define FS_MOUNT_SYNC (1 << 0)
+#define FS_MOUNT_READONLY (1 << 1)
+#define FS_MOUNT_NOEXEC (1 << 2)
+    uint32_t flags;
+
+    struct fs_entry *root; // root fs_entry for this fs instance
+    struct inode *dirtyNodes; // list of inodes that are out of sync
+    void *custom; // custom
+    const struct file_system_instance_ops *ops;
+
+    struct file_system_instance *prev, *next;
+};
+
+struct file_system {
+    char name[FS_NAME_MAXLEN];
+    struct file_system_instance *instances;
+    void *custom;
+
+    int (*mount)(struct file_system *this, struct inode *device, const char *args,
+                 struct file_system_instance **mountedFs);
+
+    int (*umount)(struct file_system *this, struct file_system_instance *mountedFs);
+
+    struct file_system *prev, *next;
+};
+
+typedef enum { SEEK_SET, SEEK_CUR, SEEK_END } seek_mode_t;
+
+struct file_operations {
+    loff_t (*llseek)(struct file *this, loff_t offset, seek_mode_t whence);
+    ssize_t (*read)(struct file *this, char *buf, size_t size, loff_t *offset);
+    ssize_t (*write)(struct file *this, const char *buf, size_t size, loff_t *offset);
+    int (*mmap)(struct file *this, uaddr_t *uaddr, size_t size,
+                int32_t access_rights, int32_t flags, loff_t offset);
+
+    int (*open)(struct inode *, struct file *);
+    int (*flush)(struct file *);
+    int (*release)(struct inode *, struct file *);
+};
+
+/**
+ * A opened file by a process
+ */
+struct file {
+    const struct process *owner;
+
+    struct fs_entry *direntry;
+    uint ref;
+    int64_t position;
+
+#define O_ACCMODE 0003
+#define O_RDONLY 00
+#define O_WRONLY 01
+#define O_RDWR 02
+
+#define O_CREAT 0100  /* Not fcntl.  */
+#define O_EXCL 0200   /* Not fcntl.  */
+#define O_NOCTTY 0400 /* Not fcntl.  */
+#define O_TRUNC 01000 /* Not fcntl.  */
+#define O_APPEND 02000
+#define O_DIRECTORY 0200000 /* Must be a directory.  */
+#define O_NOFOLLOW 0400000  /* Do not follow links.  */
+#define O_SYNC 04010000
+#define O_CLOEXEC 02000000 /* Set close_on_exec.  */
+
+    uint32_t flags;
+    const struct file_operations *ops;
+
+    int (*duplicate)(struct file *this, const struct process *owner, struct file **result);
+
+    void *custom;
+};
+
+int fsRegister(struct file_system *fs);
+
 int fsInodeUnref(struct inode *inode);
 int fsInodeRef(struct inode *inode);

core/main.c

@@ -7,7 +7,6 @@
 #include "gdt.h"
 #include "idt.h"
 #include "interrupt.h"
-#include "io.h"
 #include "irq.h"
 #include "kernel.h"
 #include "keyboard.h"
@@ -20,7 +19,6 @@
 #include "process.h"
 #include "serial.h"
 #include "stack.h"
-#include "stdarg.h"
 #include "swintr.h"
 #include "thread.h"
 #ifdef RUN_TEST
@@ -42,7 +40,6 @@ void idleThread(void *arg)
     }
 }
 
-
 #define FILE_HEADER_SIZE   16
 #define FILE_MAX_SIZE   64 // In nb of sectors
 void loadUserSpace()
@@ -54,7 +51,7 @@ void loadUserSpace()
         return;
     }
 
-    char *buf = malloc(FILE_MAX_SIZE * DISK_SECTOR_SIZE);
+    char *buf = (char *)malloc(FILE_MAX_SIZE * DISK_SECTOR_SIZE);
     if (buf == NULL) {
         printf("ENOMEM\n");
         return;

core/types.h

@@ -9,3 +9,6 @@ typedef unsigned long paddr_t;
 
 // Userspace vaddr
 typedef unsigned long uaddr_t;
+
+// Offset
+typedef long long loff_t;