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Merge "libsnapshot: chunk iov writes" into main am: 6bee318285 am: 5044d3fd01

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Original change: https://android-review.googlesource.com/c/platform/system/core/+/3001513

Change-Id: Ibd60633bc1f89ac3dda6fe87d6738c1ee16fb036
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
This commit is contained in:
Daniel Zheng 2024-03-22 19:17:54 +00:00 committed by Automerger Merge Worker
commit a4f8ee1f45
1 changed files with 17 additions and 3 deletions
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20
fs_mgr/libsnapshot/libsnapshot_cow/writer_v3.cpp
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@ -717,13 +717,27 @@ bool CowWriterV3::WriteOperation(std::span<const CowOperationV3> ops,
return false;
}
if (!data.empty()) {
const auto ret = pwritev(fd_, data.data(), data.size(), next_data_pos_);
if (ret != total_data_size) {
int total_written = 0;
int i = 0;
while (i < data.size()) {
int chunk = std::min(static_cast<int>(data.size() - i), IOV_MAX);
const auto ret = pwritev(fd_, data.data() + i, chunk, next_data_pos_ + total_written);
if (ret < 0) {
PLOG(ERROR) << "write failed chunk size of: " << chunk
<< " at offset: " << next_data_pos_ + total_written << " " << errno;
return false;
}
total_written += ret;
i += chunk;
}
if (total_written != total_data_size) {
PLOG(ERROR) << "write failed for data of size: " << data.size()
<< " at offset: " << next_data_pos_ << " " << ret;
<< " at offset: " << next_data_pos_ << " " << errno;
return false;
}
}
header_.op_count += ops.size();
next_data_pos_ += total_data_size;