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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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