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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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