1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef LIBRARIES_NACL_IO_MOUNT_H_ 6 #define LIBRARIES_NACL_IO_MOUNT_H_ 7 8 #include <map> 9 #include <string> 10 11 #include "nacl_io/error.h" 12 #include "nacl_io/inode_pool.h" 13 #include "nacl_io/mount_node.h" 14 #include "nacl_io/path.h" 15 16 #include "sdk_util/macros.h" 17 #include "sdk_util/ref_object.h" 18 #include "sdk_util/scoped_ref.h" 19 20 namespace nacl_io { 21 22 class Mount; 23 class MountNode; 24 class PepperInterface; 25 26 typedef sdk_util::ScopedRef<Mount> ScopedMount; 27 typedef std::map<std::string, std::string> StringMap_t; 28 29 // NOTE: The KernelProxy is the only class that should be setting errno. All 30 // other classes should return Error (as defined by nacl_io/error.h). 31 class Mount : public sdk_util::RefObject { 32 protected: 33 // The protected functions are only used internally and will not 34 // acquire or release the mount's lock. 35 Mount(); 36 virtual ~Mount(); 37 38 // Init must be called by the factory before the mount is used. 39 // This function must assign a root node, or replace FindNode. 40 // |ppapi| can be NULL. If so, this mount cannot make any pepper calls. 41 virtual Error Init(int dev, StringMap_t& args, PepperInterface* ppapi); 42 virtual void Destroy(); 43 44 public: 45 PepperInterface* ppapi() { return ppapi_; } 46 47 // All paths in functions below are expected to containing a leading "/". 48 49 // Test whether a file or directory at a given path can be accessed. 50 // Returns 0 on success, or an appropriate errno value on failure. 51 virtual Error Access(const Path& path, int a_mode) = 0; 52 53 // Open a node at |path| with the specified open flags. The resulting 54 // MountNode is created with a ref count of 1. 55 // Assumes that |out_node| is non-NULL. 56 virtual Error Open(const Path& path, 57 int o_flags, 58 ScopedMountNode* out_node) = 0; 59 60 // OpenResource is only used to read files from the NaCl NMF file. No mount 61 // except MountPassthrough should implement it. 62 // Assumes that |out_node| is non-NULL. 63 virtual Error OpenResource(const Path& path, ScopedMountNode* out_node); 64 65 // Unlink, Mkdir, Rmdir will affect the both the RefCount 66 // and the nlink number in the stat object. 67 virtual Error Unlink(const Path& path) = 0; 68 virtual Error Mkdir(const Path& path, int permissions) = 0; 69 virtual Error Rmdir(const Path& path) = 0; 70 virtual Error Remove(const Path& path) = 0; 71 72 // Convert from R,W,R/W open flags to STAT permission flags 73 static int OpenModeToPermission(int mode); 74 75 // Assumes that |node| is non-NULL. 76 void OnNodeCreated(MountNode* node); 77 78 // Assumes that |node| is non-NULL. 79 void OnNodeDestroyed(MountNode* node); 80 81 protected: 82 // Device number for the mount. 83 int dev_; 84 PepperInterface* ppapi_; // Weak reference. 85 INodePool inode_pool_; 86 87 private: 88 // May only be called by the KernelProxy when the Kernel's 89 // lock is held, so we make it private. 90 friend class KernelObject; 91 friend class KernelProxy; 92 DISALLOW_COPY_AND_ASSIGN(Mount); 93 }; 94 95 } // namespace nacl_io 96 97 #endif // LIBRARIES_NACL_IO_MOUNT_H_ 98
