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authorxunchang <xunchang@google.com>2019-03-22 16:54:35 +0100
committerTianjie Xu <xunchang@google.com>2019-05-01 21:09:38 +0200
commit311e6ca7b609e578c0ec132440a4ad981db70a9e (patch)
tree206a8c1268e4664cb06890f9835d86e83014ae8a /fuse_sideload
parentMerge changes I2d42f55a,Ic1b5dbf7 (diff)
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Diffstat (limited to 'fuse_sideload')
-rw-r--r--fuse_sideload/Android.bp4
-rw-r--r--fuse_sideload/fuse_provider.cpp79
-rw-r--r--fuse_sideload/include/fuse_provider.h28
3 files changed, 111 insertions, 0 deletions
diff --git a/fuse_sideload/Android.bp b/fuse_sideload/Android.bp
index 8548548d2..9bf19eb85 100644
--- a/fuse_sideload/Android.bp
+++ b/fuse_sideload/Android.bp
@@ -34,6 +34,10 @@ cc_library {
"include",
],
+ static_libs: [
+ "libotautil",
+ ],
+
shared_libs: [
"libbase",
"libcrypto",
diff --git a/fuse_sideload/fuse_provider.cpp b/fuse_sideload/fuse_provider.cpp
index 58786f5f3..5ee6e247f 100644
--- a/fuse_sideload/fuse_provider.cpp
+++ b/fuse_sideload/fuse_provider.cpp
@@ -27,8 +27,11 @@
#include <functional>
#include <android-base/file.h>
+#include <android-base/logging.h>
+#include <android-base/strings.h>
#include "fuse_sideload.h"
+#include "otautil/sysutil.h"
FuseFileDataProvider::FuseFileDataProvider(const std::string& path, uint32_t block_size) {
struct stat sb;
@@ -69,3 +72,79 @@ bool FuseFileDataProvider::ReadBlockAlignedData(uint8_t* buffer, uint32_t fetch_
void FuseFileDataProvider::Close() {
fd_.reset();
}
+
+FuseBlockDataProvider::FuseBlockDataProvider(uint64_t file_size, uint32_t fuse_block_size,
+ android::base::unique_fd&& fd,
+ uint32_t source_block_size, RangeSet ranges)
+ : FuseDataProvider(file_size, fuse_block_size),
+ fd_(std::move(fd)),
+ source_block_size_(source_block_size),
+ ranges_(std::move(ranges)) {
+ // Make sure the offset is also aligned with the blocks on the block device when we call
+ // ReadBlockAlignedData().
+ CHECK_EQ(0, fuse_block_size_ % source_block_size_);
+}
+
+bool FuseBlockDataProvider::ReadBlockAlignedData(uint8_t* buffer, uint32_t fetch_size,
+ uint32_t start_block) const {
+ uint64_t offset = static_cast<uint64_t>(start_block) * fuse_block_size_;
+ if (fetch_size > file_size_ || offset > file_size_ - fetch_size) {
+ LOG(ERROR) << "Out of bound read, offset: " << offset << ", fetch size: " << fetch_size
+ << ", file size " << file_size_;
+ return false;
+ }
+
+ auto read_ranges =
+ ranges_.GetSubRanges(offset / source_block_size_, fetch_size / source_block_size_);
+ if (!read_ranges) {
+ return false;
+ }
+
+ uint8_t* next_out = buffer;
+ for (const auto& [range_start, range_end] : read_ranges.value()) {
+ uint64_t bytes_start = static_cast<uint64_t>(range_start) * source_block_size_;
+ uint64_t bytes_to_read = static_cast<uint64_t>(range_end - range_start) * source_block_size_;
+ if (!android::base::ReadFullyAtOffset(fd_, next_out, bytes_to_read, bytes_start)) {
+ PLOG(ERROR) << "Failed to read " << bytes_to_read << " bytes at offset " << bytes_start;
+ return false;
+ }
+
+ next_out += bytes_to_read;
+ }
+
+ if (uint64_t tailing_bytes = fetch_size % source_block_size_; tailing_bytes != 0) {
+ // Calculate the offset to last partial block.
+ uint64_t tailing_offset =
+ read_ranges.value()
+ ? static_cast<uint64_t>((read_ranges->cend() - 1)->second) * source_block_size_
+ : static_cast<uint64_t>(start_block) * source_block_size_;
+ if (!android::base::ReadFullyAtOffset(fd_, next_out, tailing_bytes, tailing_offset)) {
+ PLOG(ERROR) << "Failed to read tailing " << tailing_bytes << " bytes at offset "
+ << tailing_offset;
+ return false;
+ }
+ }
+ return true;
+}
+
+std::unique_ptr<FuseBlockDataProvider> FuseBlockDataProvider::CreateFromBlockMap(
+ const std::string& block_map_path, uint32_t fuse_block_size) {
+ auto block_map = BlockMapData::ParseBlockMapFile(block_map_path);
+ if (!block_map) {
+ return nullptr;
+ }
+
+ android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(block_map.path().c_str(), O_RDONLY)));
+ if (fd == -1) {
+ PLOG(ERROR) << "Failed to open " << block_map.path();
+ return nullptr;
+ }
+
+ return std::unique_ptr<FuseBlockDataProvider>(
+ new FuseBlockDataProvider(block_map.file_size(), fuse_block_size, std::move(fd),
+ block_map.block_size(), block_map.block_ranges()));
+}
+
+void FuseBlockDataProvider::Close() {
+ fd_.reset();
+}
diff --git a/fuse_sideload/include/fuse_provider.h b/fuse_sideload/include/fuse_provider.h
index 59059cf9b..8d4ea4073 100644
--- a/fuse_sideload/include/fuse_provider.h
+++ b/fuse_sideload/include/fuse_provider.h
@@ -18,10 +18,13 @@
#include <stdint.h>
+#include <memory>
#include <string>
#include <android-base/unique_fd.h>
+#include "otautil/rangeset.h"
+
// This is the base class to read data from source and provide the data to FUSE.
class FuseDataProvider {
public:
@@ -70,3 +73,28 @@ class FuseFileDataProvider : public FuseDataProvider {
// The underlying source to read data from.
android::base::unique_fd fd_;
};
+
+// This class parses a block map and reads data from the underlying block device.
+class FuseBlockDataProvider : public FuseDataProvider {
+ public:
+ // Constructs the fuse provider from the block map.
+ static std::unique_ptr<FuseBlockDataProvider> CreateFromBlockMap(
+ const std::string& block_map_path, uint32_t fuse_block_size);
+
+ RangeSet ranges() const {
+ return ranges_;
+ }
+ bool ReadBlockAlignedData(uint8_t* buffer, uint32_t fetch_size,
+ uint32_t start_block) const override;
+ void Close() override;
+
+ private:
+ FuseBlockDataProvider(uint64_t file_size, uint32_t fuse_block_size, android::base::unique_fd&& fd,
+ uint32_t source_block_size, RangeSet ranges);
+ // The underlying block device to read data from.
+ android::base::unique_fd fd_;
+ // The block size of the source block device.
+ uint32_t source_block_size_;
+ // The block ranges from the source block device that consist of the file
+ RangeSet ranges_;
+};