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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef NET_DISK_CACHE_BLOCKFILE_SPARSE_CONTROL_V3_H_ | 5 #ifndef NET_DISK_CACHE_BLOCKFILE_SPARSE_CONTROL_V3_H_ |
6 #define NET_DISK_CACHE_BLOCKFILE_SPARSE_CONTROL_V3_H_ | 6 #define NET_DISK_CACHE_BLOCKFILE_SPARSE_CONTROL_V3_H_ |
7 | 7 |
8 #include <string> | 8 #include <string> |
9 #include <vector> | 9 #include <vector> |
10 | 10 |
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47 // Performs a quick test to see if the entry is sparse or not, without | 47 // Performs a quick test to see if the entry is sparse or not, without |
48 // generating disk IO (so the answer provided is only a best effort). | 48 // generating disk IO (so the answer provided is only a best effort). |
49 bool CouldBeSparse() const; | 49 bool CouldBeSparse() const; |
50 | 50 |
51 // Performs an actual sparse read or write operation for this entry. |op| is | 51 // Performs an actual sparse read or write operation for this entry. |op| is |
52 // the operation to perform, |offset| is the desired sparse offset, |buf| and | 52 // the operation to perform, |offset| is the desired sparse offset, |buf| and |
53 // |buf_len| specify the actual data to use and |callback| is the callback | 53 // |buf_len| specify the actual data to use and |callback| is the callback |
54 // to use for asynchronous operations. See the description of the Read / | 54 // to use for asynchronous operations. See the description of the Read / |
55 // WriteSparseData for details about the arguments. The return value is the | 55 // WriteSparseData for details about the arguments. The return value is the |
56 // number of bytes read or written, or a net error code. | 56 // number of bytes read or written, or a net error code. |
57 int StartIO(SparseOperation op, int64 offset, net::IOBuffer* buf, | 57 int StartIO(SparseOperation op, |
58 int buf_len, const CompletionCallback& callback); | 58 int64 offset, |
| 59 net::IOBuffer* buf, |
| 60 int buf_len, |
| 61 const CompletionCallback& callback); |
59 | 62 |
60 // Implements Entry::GetAvailableRange(). | 63 // Implements Entry::GetAvailableRange(). |
61 int GetAvailableRange(int64 offset, int len, int64* start); | 64 int GetAvailableRange(int64 offset, int len, int64* start); |
62 | 65 |
63 // Cancels the current sparse operation (if any). | 66 // Cancels the current sparse operation (if any). |
64 void CancelIO(); | 67 void CancelIO(); |
65 | 68 |
66 // Returns OK if the entry can be used for new IO or ERR_IO_PENDING if we are | 69 // Returns OK if the entry can be used for new IO or ERR_IO_PENDING if we are |
67 // busy. If the entry is busy, we'll invoke the callback when we are ready | 70 // busy. If the entry is busy, we'll invoke the callback when we are ready |
68 // again. See disk_cache::Entry::ReadyToUse() for more info. | 71 // again. See disk_cache::Entry::ReadyToUse() for more info. |
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86 | 89 |
87 // Opens and closes a child entry. A child entry is a regular EntryImpl object | 90 // Opens and closes a child entry. A child entry is a regular EntryImpl object |
88 // with a key derived from the key of the resource to store and the range | 91 // with a key derived from the key of the resource to store and the range |
89 // stored by that child. | 92 // stored by that child. |
90 bool OpenChild(); | 93 bool OpenChild(); |
91 void CloseChild(); | 94 void CloseChild(); |
92 | 95 |
93 // Continues the current operation (open) without a current child. | 96 // Continues the current operation (open) without a current child. |
94 bool ContinueWithoutChild(const std::string& key); | 97 bool ContinueWithoutChild(const std::string& key); |
95 | 98 |
96 // Writes to disk the tracking information for this entry. | 99 // Writes to disk the tracking information for this entry. |
97 void WriteSparseData(); | 100 void WriteSparseData(); |
98 | 101 |
99 // Performs a single operation with the current child. Returns true when we | 102 // Performs a single operation with the current child. Returns true when we |
100 // should move on to the next child and false when we should interrupt our | 103 // should move on to the next child and false when we should interrupt our |
101 // work. | 104 // work. |
102 bool DoChildIO(); | 105 bool DoChildIO(); |
103 | 106 |
104 // Performs the required work after a single IO operations finishes. | 107 // Performs the required work after a single IO operations finishes. |
105 void DoChildIOCompleted(int result); | 108 void DoChildIOCompleted(int result); |
106 | 109 |
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144 // Invoked by the callback of asynchronous operations. | 147 // Invoked by the callback of asynchronous operations. |
145 void OnChildIOCompleted(int result); | 148 void OnChildIOCompleted(int result); |
146 | 149 |
147 EntryImpl* entry_; // The sparse entry. | 150 EntryImpl* entry_; // The sparse entry. |
148 EntryImpl* child_; // The current child entry. | 151 EntryImpl* child_; // The current child entry. |
149 SparseOperation operation_; | 152 SparseOperation operation_; |
150 bool pending_; // True if any child IO operation returned pending. | 153 bool pending_; // True if any child IO operation returned pending. |
151 bool finished_; | 154 bool finished_; |
152 bool init_; | 155 bool init_; |
153 bool range_found_; // True if GetAvailableRange found something. | 156 bool range_found_; // True if GetAvailableRange found something. |
154 bool abort_; // True if we should abort the current operation ASAP. | 157 bool abort_; // True if we should abort the current operation ASAP. |
155 | 158 |
156 SparseHeader sparse_header_; // Data about the children of entry_. | 159 SparseHeader sparse_header_; // Data about the children of entry_. |
157 Bitmap children_map_; // The actual bitmap of children. | 160 Bitmap children_map_; // The actual bitmap of children. |
158 SparseData child_data_; // Parent and allocation map of child_. | 161 SparseData child_data_; // Parent and allocation map of child_. |
159 Bitmap child_map_; // The allocation map as a bitmap. | 162 Bitmap child_map_; // The allocation map as a bitmap. |
160 | 163 |
161 CompletionCallback user_callback_; | 164 CompletionCallback user_callback_; |
162 std::vector<CompletionCallback> abort_callbacks_; | 165 std::vector<CompletionCallback> abort_callbacks_; |
163 int64 offset_; // Current sparse offset. | 166 int64 offset_; // Current sparse offset. |
164 scoped_refptr<net::DrainableIOBuffer> user_buf_; | 167 scoped_refptr<net::DrainableIOBuffer> user_buf_; |
165 int buf_len_; // Bytes to read or write. | 168 int buf_len_; // Bytes to read or write. |
166 int child_offset_; // Offset to use for the current child. | 169 int child_offset_; // Offset to use for the current child. |
167 int child_len_; // Bytes to read or write for this child. | 170 int child_len_; // Bytes to read or write for this child. |
168 int result_; | 171 int result_; |
169 | 172 |
170 DISALLOW_COPY_AND_ASSIGN(SparseControl); | 173 DISALLOW_COPY_AND_ASSIGN(SparseControl); |
171 }; | 174 }; |
172 | 175 |
173 } // namespace disk_cache | 176 } // namespace disk_cache |
174 | 177 |
175 #endif // NET_DISK_CACHE_BLOCKFILE_SPARSE_CONTROL_V3_H_ | 178 #endif // NET_DISK_CACHE_BLOCKFILE_SPARSE_CONTROL_V3_H_ |
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