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1 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved. | 1 // Copyright (c) 2010 The Chromium OS 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 "update_engine/delta_performer.h" | 5 #include "update_engine/delta_performer.h" |
6 | 6 |
7 #include <endian.h> | 7 #include <endian.h> |
8 #include <errno.h> | 8 #include <errno.h> |
9 | 9 |
10 #include <algorithm> | 10 #include <algorithm> |
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112 | 112 |
113 } // namespace {} | 113 } // namespace {} |
114 | 114 |
115 // Returns true if |op| is idempotent -- i.e., if we can interrupt it and repeat | 115 // Returns true if |op| is idempotent -- i.e., if we can interrupt it and repeat |
116 // it safely. Returns false otherwise. | 116 // it safely. Returns false otherwise. |
117 bool DeltaPerformer::IsIdempotentOperation( | 117 bool DeltaPerformer::IsIdempotentOperation( |
118 const DeltaArchiveManifest_InstallOperation& op) { | 118 const DeltaArchiveManifest_InstallOperation& op) { |
119 if (op.src_extents_size() == 0) { | 119 if (op.src_extents_size() == 0) { |
120 return true; | 120 return true; |
121 } | 121 } |
122 // TODO(adlr): detect other types of idempotent operations. For example, | 122 // When in doubt, it's safe to declare an op non-idempotent. Note that we |
123 // a MOVE may move a block onto itself. | 123 // could detect other types of idempotent operations here such as a MOVE that |
124 | 124 // moves blocks onto themselves. However, we rely on the server to not send |
125 // When in doubt, it's safe to declare an op non-idempotent. | 125 // such operations at all. |
126 ExtentRanges src_ranges; | 126 ExtentRanges src_ranges; |
127 src_ranges.AddRepeatedExtents(op.src_extents()); | 127 src_ranges.AddRepeatedExtents(op.src_extents()); |
128 const uint64_t block_count = src_ranges.blocks(); | 128 const uint64_t block_count = src_ranges.blocks(); |
129 src_ranges.SubtractRepeatedExtents(op.dst_extents()); | 129 src_ranges.SubtractRepeatedExtents(op.dst_extents()); |
130 return block_count == src_ranges.blocks(); | 130 return block_count == src_ranges.blocks(); |
131 } | 131 } |
132 | 132 |
133 int DeltaPerformer::Open(const char* path, int flags, mode_t mode) { | 133 int DeltaPerformer::Open(const char* path, int flags, mode_t mode) { |
134 int err; | 134 int err; |
135 if (OpenFile(path, &fd_, &err)) | 135 if (OpenFile(path, &fd_, &err)) |
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716 if (prefs_->GetInt64(kPrefsResumedUpdateFailures, &resumed_update_failures)) { | 716 if (prefs_->GetInt64(kPrefsResumedUpdateFailures, &resumed_update_failures)) { |
717 resumed_update_failures++; | 717 resumed_update_failures++; |
718 } else { | 718 } else { |
719 resumed_update_failures = 1; | 719 resumed_update_failures = 1; |
720 } | 720 } |
721 prefs_->SetInt64(kPrefsResumedUpdateFailures, resumed_update_failures); | 721 prefs_->SetInt64(kPrefsResumedUpdateFailures, resumed_update_failures); |
722 return true; | 722 return true; |
723 } | 723 } |
724 | 724 |
725 } // namespace chromeos_update_engine | 725 } // namespace chromeos_update_engine |
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