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| 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_MOUNTS_MOUNT_H_ | |
| 6 #define LIBRARIES_NACL_MOUNTS_MOUNT_H_ | |
| 7 | |
| 8 #include <map> | |
| 9 #include <string> | |
| 10 | |
| 11 #include "nacl_mounts/inode_pool.h" | |
| 12 #include "nacl_mounts/mount_node.h" | |
| 13 #include "nacl_mounts/path.h" | |
| 14 #include "utils/macros.h" | |
| 15 #include "utils/ref_object.h" | |
| 16 | |
| 17 class MountNode; | |
| 18 class PepperInterface; | |
| 19 | |
| 20 typedef std::map<std::string, std::string> StringMap_t; | |
| 21 | |
| 22 | |
| 23 class Mount : public RefObject { | |
| 24 protected: | |
| 25 // The protected functions are only used internally and will not | |
| 26 // acquire or release the mount's lock. | |
| 27 Mount(); | |
| 28 virtual ~Mount(); | |
| 29 | |
| 30 // Init must be called by the factory before the mount is used. | |
| 31 // This function must assign a root node, or replace FindNode. | |
| 32 // |ppapi| can be NULL. If so, this mount cannot make any pepper calls. | |
| 33 virtual bool Init(int dev, StringMap_t& args, PepperInterface* ppapi); | |
| 34 virtual void Destroy(); | |
| 35 | |
| 36 public: | |
| 37 template <class M> | |
| 38 static Mount* Create(int dev, StringMap_t& args, PepperInterface* ppapi); | |
| 39 | |
| 40 PepperInterface* ppapi() { return ppapi_; } | |
| 41 | |
| 42 // All paths are expected to containing a leading "/" | |
| 43 void AcquireNode(MountNode* node); | |
| 44 void ReleaseNode(MountNode* node); | |
| 45 | |
| 46 // Open a node at |path| with the specified open flags. The resulting | |
| 47 // MountNode is created with a ref count of 1. | |
| 48 virtual MountNode *Open(const Path& path, int o_flags) = 0; | |
| 49 | |
| 50 // Unlink, Mkdir, Rmdir will affect the both the RefCount | |
| 51 // and the nlink number in the stat object. | |
| 52 virtual int Unlink(const Path& path) = 0; | |
| 53 virtual int Mkdir(const Path& path, int permissions) = 0; | |
| 54 virtual int Rmdir(const Path& path) = 0; | |
| 55 virtual int Remove(const Path& path) = 0; | |
| 56 | |
| 57 // Convert from R,W,R/W open flags to STAT permission flags | |
| 58 static int OpenModeToPermission(int mode); | |
| 59 | |
| 60 void OnNodeCreated(MountNode* node) ; | |
| 61 void OnNodeDestroyed(MountNode* node); | |
| 62 | |
| 63 protected: | |
| 64 // Device number for the mount. | |
| 65 int dev_; | |
| 66 PepperInterface* ppapi_; // Weak reference. | |
| 67 INodePool inode_pool_; | |
| 68 | |
| 69 private: | |
| 70 // May only be called by the KernelProxy when the Kernel's | |
| 71 // lock is held, so we make it private. | |
| 72 friend class KernelObject; | |
| 73 friend class KernelProxy; | |
| 74 void Acquire() { RefObject::Acquire(); } | |
| 75 bool Release() { return RefObject::Release(); } | |
| 76 | |
| 77 DISALLOW_COPY_AND_ASSIGN(Mount); | |
| 78 }; | |
| 79 | |
| 80 | |
| 81 template <class M> | |
| 82 /*static*/ | |
| 83 Mount* Mount::Create(int dev, StringMap_t& args, PepperInterface* ppapi) { | |
| 84 Mount* mnt = new M(); | |
| 85 if (mnt->Init(dev, args, ppapi) == false) { | |
| 86 delete mnt; | |
| 87 return NULL; | |
| 88 } | |
| 89 return mnt; | |
| 90 } | |
| 91 | |
| 92 #endif // LIBRARIES_NACL_MOUNTS_MOUNT_H_ | |
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