CE add rm command, implement remove () syscall

kernel/fs/fatfs.c

@@ -264,5 +264,12 @@ int fatfs_create_dir (struct vfs_volume* volume, const char* path) {
   struct fatfs_ctx* fatfs_ctx = volume->udata;
 
   int r = fl_createdirectory (fatfs_ctx, path);
-  return r == 0 ? ST_OK : ST_CREATE_DIR_ERROR;
+  return r == 0 ? ST_OK : -ST_CREATE_DIR_ERROR;
+}
+
+int fatfs_remove (struct vfs_volume* volume, const char* path) {
+  struct fatfs_ctx* fatfs_ctx = volume->udata;
+
+  int r = fl_remove (fatfs_ctx, path);
+  return r == 0 ? ST_OK : -ST_REMOVE_ERROR;
 }

kernel/fs/fatfs.h

@@ -31,4 +31,6 @@ int fatfs_create_file (struct vfs_volume* volume, const char* path);
 
 int fatfs_create_dir (struct vfs_volume* volume, const char* path);
 
+int fatfs_remove (struct vfs_volume* volume, const char* path);
+
 #endif // _KERNEL_FS_FATFS_H

kernel/fs/tarfs.c

@@ -213,3 +213,8 @@ int tarfs_create_dir (struct vfs_volume* volume, const char* path) {
   (void)volume, (void)path;
   return ST_OK;
 }
+
+int tarfs_remove (struct vfs_volume* volume, const char* path) {
+  (void)volume, (void)path;
+  return ST_OK;
+}

kernel/fs/tarfs.h

@@ -53,4 +53,6 @@ int tarfs_create_file (struct vfs_volume* volume, const char* path);
 
 int tarfs_create_dir (struct vfs_volume* volume, const char* path);
 
+int tarfs_remove (struct vfs_volume* volume, const char* path);
+
 #endif // _KERNEL_FS_TARFS_H

kernel/fs/vfs.c

@@ -62,6 +62,7 @@ int vfs_create_volume (const char* key, int fs_type, struct device* back_device,
     volume->driver_ops.read_dir_entry = &tarfs_read_dir_entry;
     volume->driver_ops.create_file = &tarfs_create_file;
     volume->driver_ops.create_dir = &tarfs_create_dir;
+    volume->driver_ops.remove = &tarfs_remove;
     break;
   case VFS_FAT16:
     volume->driver_ops.mount = &fatfs_mount;
@@ -72,6 +73,7 @@ int vfs_create_volume (const char* key, int fs_type, struct device* back_device,
     volume->driver_ops.read_dir_entry = &fatfs_read_dir_entry;
     volume->driver_ops.create_file = &fatfs_create_file;
     volume->driver_ops.create_dir = &fatfs_create_dir;
+    volume->driver_ops.remove = &fatfs_remove;
     break;
   case VFS_FAT32:
     volume->driver_ops.mount = &fatfs_mount;
@@ -82,6 +84,7 @@ int vfs_create_volume (const char* key, int fs_type, struct device* back_device,
     volume->driver_ops.read_dir_entry = &fatfs_read_dir_entry;
     volume->driver_ops.create_file = &fatfs_create_file;
     volume->driver_ops.create_dir = &fatfs_create_dir;
+    volume->driver_ops.remove = &fatfs_remove;
     break;
   default:
     free (volume);
@@ -300,6 +303,24 @@ int vfs_create_dir (struct proc* proc, const char* volume_name, const char* path
   return volume->driver_ops.create_dir (volume, path);
 }
 
+int vfs_remove (struct proc* proc, const char* volume_name, const char* path) {
+  struct vfs_volume* volume = vfs_find_volume (volume_name);
+
+  if (volume == NULL)
+    return -ST_NOT_FOUND;
+
+  spin_lock (&volume->lock);
+
+  if (volume->locked && volume->owner != proc) {
+    spin_unlock (&volume->lock);
+    return -ST_PERMISSION_ERROR;
+  }
+
+  spin_unlock (&volume->lock);
+
+  return volume->driver_ops.remove (volume, path);
+}
+
 void vfs_init (void) {
   memset (&volume_table, 0, sizeof (volume_table));
 

kernel/fs/vfs.h

@@ -50,6 +50,8 @@ struct vfs_volume {
     int (*create_file) (struct vfs_volume* volume, const char* path);
 
     int (*create_dir) (struct vfs_volume* volume, const char* path);
+
+    int (*remove) (struct vfs_volume* volume, const char* path);
   } driver_ops;
   struct device* back_device;
   void* udata
@@ -83,6 +85,8 @@ int vfs_create_file (struct proc* proc, const char* volume_name, const char* pat
 
 int vfs_create_dir (struct proc* proc, const char* volume_name, const char* path);
 
+int vfs_remove (struct proc* proc, const char* volume_name, const char* path);
+
 void vfs_init (void);
 
 void vfs_translate (size_t fs_block, size_t fs_block_count, size_t fs_block_size,

kernel/syscall/syscall.c

@@ -617,6 +617,30 @@ DEFINE_SYSCALL (sys_create_dir) {
   return SYSRESULT (ret);
 }
 
+/* int remove (char* path) */
+DEFINE_SYSCALL (sys_remove) {
+  uintptr_t uvaddr_path = a1;
+
+  struct limine_hhdm_response* hhdm = limine_hhdm_request.response;
+
+  uintptr_t out_paddr;
+
+  spin_lock (&proc->procgroup->lock);
+  out_paddr = mm_v2p (&proc->procgroup->pd, uvaddr_path);
+  spin_unlock (&proc->procgroup->lock);
+
+  if (out_paddr == 0)
+    return SYSRESULT (-ST_BAD_ADDRESS_SPACE);
+
+  const char* path = (const char*)((uintptr_t)hhdm->offset + out_paddr);
+
+  spin_lock (&proc->lock);
+  int ret = vfs_remove (proc, proc->cwv, path);
+  spin_unlock (&proc->lock);
+
+  return SYSRESULT (ret);
+}
+
 static syscall_handler_func_t handler_table[] = {
     [SYS_QUIT] = &sys_quit,
     [SYS_TEST] = &sys_test,
@@ -645,6 +669,7 @@ static syscall_handler_func_t handler_table[] = {
     [SYS_WAIT_FOR_PID] = &sys_wait_for_pid,
     [SYS_KILL] = &sys_kill,
     [SYS_CREATE_DIR] = &sys_create_dir,
+    [SYS_REMOVE] = &sys_remove,
 };
 
 syscall_handler_func_t syscall_find_handler (int syscall_num) {