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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_H_ | 5 #ifndef NET_DISK_CACHE_BLOCKFILE_SPARSE_CONTROL_H_ |
6 #define NET_DISK_CACHE_BLOCKFILE_SPARSE_CONTROL_H_ | 6 #define NET_DISK_CACHE_BLOCKFILE_SPARSE_CONTROL_H_ |
7 | 7 |
8 #include <string> | 8 #include <string> |
9 #include <vector> | 9 #include <vector> |
10 | 10 |
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52 // Performs a quick test to see if the entry is sparse or not, without | 52 // Performs a quick test to see if the entry is sparse or not, without |
53 // generating disk IO (so the answer provided is only a best effort). | 53 // generating disk IO (so the answer provided is only a best effort). |
54 bool CouldBeSparse() const; | 54 bool CouldBeSparse() const; |
55 | 55 |
56 // Performs an actual sparse read or write operation for this entry. |op| is | 56 // Performs an actual sparse read or write operation for this entry. |op| is |
57 // the operation to perform, |offset| is the desired sparse offset, |buf| and | 57 // the operation to perform, |offset| is the desired sparse offset, |buf| and |
58 // |buf_len| specify the actual data to use and |callback| is the callback | 58 // |buf_len| specify the actual data to use and |callback| is the callback |
59 // to use for asynchronous operations. See the description of the Read / | 59 // to use for asynchronous operations. See the description of the Read / |
60 // WriteSparseData for details about the arguments. The return value is the | 60 // WriteSparseData for details about the arguments. The return value is the |
61 // number of bytes read or written, or a net error code. | 61 // number of bytes read or written, or a net error code. |
62 int StartIO(SparseOperation op, int64 offset, net::IOBuffer* buf, | 62 int StartIO(SparseOperation op, |
63 int buf_len, const CompletionCallback& callback); | 63 int64 offset, |
| 64 net::IOBuffer* buf, |
| 65 int buf_len, |
| 66 const CompletionCallback& callback); |
64 | 67 |
65 // Implements Entry::GetAvailableRange(). | 68 // Implements Entry::GetAvailableRange(). |
66 int GetAvailableRange(int64 offset, int len, int64* start); | 69 int GetAvailableRange(int64 offset, int len, int64* start); |
67 | 70 |
68 // Cancels the current sparse operation (if any). | 71 // Cancels the current sparse operation (if any). |
69 void CancelIO(); | 72 void CancelIO(); |
70 | 73 |
71 // Returns OK if the entry can be used for new IO or ERR_IO_PENDING if we are | 74 // Returns OK if the entry can be used for new IO or ERR_IO_PENDING if we are |
72 // busy. If the entry is busy, we'll invoke the callback when we are ready | 75 // busy. If the entry is busy, we'll invoke the callback when we are ready |
73 // again. See disk_cache::Entry::ReadyToUse() for more info. | 76 // again. See disk_cache::Entry::ReadyToUse() for more info. |
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146 void DoUserCallback(); | 149 void DoUserCallback(); |
147 void DoAbortCallbacks(); | 150 void DoAbortCallbacks(); |
148 | 151 |
149 EntryImpl* entry_; // The sparse entry. | 152 EntryImpl* entry_; // The sparse entry. |
150 EntryImpl* child_; // The current child entry. | 153 EntryImpl* child_; // The current child entry. |
151 SparseOperation operation_; | 154 SparseOperation operation_; |
152 bool pending_; // True if any child IO operation returned pending. | 155 bool pending_; // True if any child IO operation returned pending. |
153 bool finished_; | 156 bool finished_; |
154 bool init_; | 157 bool init_; |
155 bool range_found_; // True if GetAvailableRange found something. | 158 bool range_found_; // True if GetAvailableRange found something. |
156 bool abort_; // True if we should abort the current operation ASAP. | 159 bool abort_; // True if we should abort the current operation ASAP. |
157 | 160 |
158 SparseHeader sparse_header_; // Data about the children of entry_. | 161 SparseHeader sparse_header_; // Data about the children of entry_. |
159 Bitmap children_map_; // The actual bitmap of children. | 162 Bitmap children_map_; // The actual bitmap of children. |
160 SparseData child_data_; // Parent and allocation map of child_. | 163 SparseData child_data_; // Parent and allocation map of child_. |
161 Bitmap child_map_; // The allocation map as a bitmap. | 164 Bitmap child_map_; // The allocation map as a bitmap. |
162 | 165 |
163 CompletionCallback user_callback_; | 166 CompletionCallback user_callback_; |
164 std::vector<CompletionCallback> abort_callbacks_; | 167 std::vector<CompletionCallback> abort_callbacks_; |
165 int64 offset_; // Current sparse offset. | 168 int64 offset_; // Current sparse offset. |
166 scoped_refptr<net::DrainableIOBuffer> user_buf_; | 169 scoped_refptr<net::DrainableIOBuffer> user_buf_; |
167 int buf_len_; // Bytes to read or write. | 170 int buf_len_; // Bytes to read or write. |
168 int child_offset_; // Offset to use for the current child. | 171 int child_offset_; // Offset to use for the current child. |
169 int child_len_; // Bytes to read or write for this child. | 172 int child_len_; // Bytes to read or write for this child. |
170 int result_; | 173 int result_; |
171 | 174 |
172 DISALLOW_COPY_AND_ASSIGN(SparseControl); | 175 DISALLOW_COPY_AND_ASSIGN(SparseControl); |
173 }; | 176 }; |
174 | 177 |
175 } // namespace disk_cache | 178 } // namespace disk_cache |
176 | 179 |
177 #endif // NET_DISK_CACHE_BLOCKFILE_SPARSE_CONTROL_H_ | 180 #endif // NET_DISK_CACHE_BLOCKFILE_SPARSE_CONTROL_H_ |
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