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@ -45,6 +45,7 @@ using android::base::StringPrintf;
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using android::base::unique_fd;
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using android::base::unique_fd;
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static const char* kVoldPrefix = "vold:";
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static const char* kVoldPrefix = "vold:";
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static constexpr size_t kLoopDeviceRetryAttempts = 3u;
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int Loop::create(const std::string& target, std::string& out_device) {
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int Loop::create(const std::string& target, std::string& out_device) {
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unique_fd ctl_fd(open("/dev/loop-control", O_RDWR | O_CLOEXEC));
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unique_fd ctl_fd(open("/dev/loop-control", O_RDWR | O_CLOEXEC));
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@ -61,7 +62,14 @@ int Loop::create(const std::string& target, std::string& out_device) {
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out_device = StringPrintf("/dev/block/loop%d", num);
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out_device = StringPrintf("/dev/block/loop%d", num);
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unique_fd target_fd(open(target.c_str(), O_RDWR | O_CLOEXEC));
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unique_fd target_fd;
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for (size_t i = 0; i != kLoopDeviceRetryAttempts; ++i) {
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target_fd.reset(open(target.c_str(), O_RDWR | O_CLOEXEC));
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if (target_fd.get() != -1) {
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break;
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}
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usleep(50000);
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}
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if (target_fd.get() == -1) {
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if (target_fd.get() == -1) {
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PLOG(ERROR) << "Failed to open " << target;
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PLOG(ERROR) << "Failed to open " << target;
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return -errno;
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return -errno;
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