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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 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 #include "base/test/test_file_util.h" | 5 #include "base/test/test_file_util.h" |
| 6 | 6 |
| 7 #include <sys/mman.h> | 7 #include <sys/mman.h> |
| 8 #include <errno.h> | 8 #include <errno.h> |
| 9 #include "base/logging.h" | 9 #include "base/logging.h" |
| 10 #include "base/file_util.h" | 10 #include "base/file_util.h" |
| 11 | 11 |
| 12 namespace file_util { | 12 namespace file_util { |
| 13 | 13 |
| 14 bool EvictFileFromSystemCache(const FilePath& file) { | 14 bool EvictFileFromSystemCache(const FilePath& file) { |
| 15 // There aren't any really direct ways to purge a file from the UBC. From | 15 // There aren't any really direct ways to purge a file from the UBC. From |
| 16 // talking with Amit Singh, the safest is to mmap the file with MAP_FILE (the | 16 // talking with Amit Singh, the safest is to mmap the file with MAP_FILE (the |
| 17 // default) + MAP_SHARED, then do an msync to invalidate the memory. The next | 17 // default) + MAP_SHARED, then do an msync to invalidate the memory. The next |
| 18 // open should then have to load the file from disk. | 18 // open should then have to load the file from disk. |
| 19 | 19 |
| 20 int64 length; | 20 int64 length; |
| 21 if (!file_util::GetFileSize(file, &length)) { | 21 if (!file_util::GetFileSize(file, &length)) { |
| 22 LOG(ERROR) << "failed to get size of " << file.value(); | 22 DLOG(ERROR) << "failed to get size of " << file.value(); |
| 23 return false; | 23 return false; |
| 24 } | 24 } |
| 25 | 25 |
| 26 // When a file is empty, we do not need to evict it from cache. | 26 // When a file is empty, we do not need to evict it from cache. |
| 27 // In fact, an attempt to map it to memory will result in error. | 27 // In fact, an attempt to map it to memory will result in error. |
| 28 if (length == 0) { | 28 if (length == 0) { |
| 29 LOG(WARNING) << "file size is zero, will not attempt to map to memory"; | 29 DLOG(WARNING) << "file size is zero, will not attempt to map to memory"; |
| 30 return true; | 30 return true; |
| 31 } | 31 } |
| 32 | 32 |
| 33 file_util::MemoryMappedFile mapped_file; | 33 file_util::MemoryMappedFile mapped_file; |
| 34 if (!mapped_file.Initialize(file)) { | 34 if (!mapped_file.Initialize(file)) { |
| 35 LOG(WARNING) << "failed to memory map " << file.value(); | 35 DLOG(WARNING) << "failed to memory map " << file.value(); |
| 36 return false; | 36 return false; |
| 37 } | 37 } |
| 38 | 38 |
| 39 if (msync(const_cast<uint8*>(mapped_file.data()), mapped_file.length(), | 39 if (msync(const_cast<uint8*>(mapped_file.data()), mapped_file.length(), |
| 40 MS_INVALIDATE) != 0) { | 40 MS_INVALIDATE) != 0) { |
| 41 LOG(WARNING) << "failed to invalidate memory map of " << file.value() | 41 DLOG(WARNING) << "failed to invalidate memory map of " << file.value() |
| 42 << ", errno: " << errno; | 42 << ", errno: " << errno; |
| 43 return false; | 43 return false; |
| 44 } | 44 } |
| 45 | 45 |
| 46 return true; | 46 return true; |
| 47 } | 47 } |
| 48 | 48 |
| 49 } // namespace file_util | 49 } // namespace file_util |
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