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@ -1386,22 +1386,54 @@ status_t EnsureDirExists(const std::string& path, mode_t mode, uid_t uid, gid_t
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return OK;
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}
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// Gets the sysfs path for parameters of the backing device info (bdi)
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static std::string getBdiPathForMount(const std::string& mount) {
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// First figure out MAJOR:MINOR of mount. Simplest way is to stat the path.
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struct stat info;
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if (stat(mount.c_str(), &info) != 0) {
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PLOG(ERROR) << "Failed to stat " << mount;
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return "";
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}
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unsigned int maj = major(info.st_dev);
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unsigned int min = minor(info.st_dev);
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return StringPrintf("/sys/class/bdi/%u:%u", maj, min);
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}
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// Configures max_ratio for the FUSE filesystem.
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void ConfigureMaxDirtyRatioForFuse(const std::string& fuse_mount, unsigned int max_ratio) {
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LOG(INFO) << "Configuring max_ratio of " << fuse_mount << " fuse filesystem to " << max_ratio;
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if (max_ratio > 100) {
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LOG(ERROR) << "Invalid max_ratio: " << max_ratio;
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return;
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}
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std::string fuseBdiPath = getBdiPathForMount(fuse_mount);
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if (fuseBdiPath == "") {
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return;
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}
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std::string max_ratio_file = StringPrintf("%s/max_ratio", fuseBdiPath.c_str());
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unique_fd fd(TEMP_FAILURE_RETRY(open(max_ratio_file.c_str(), O_WRONLY | O_CLOEXEC)));
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if (fd.get() == -1) {
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PLOG(ERROR) << "Failed to open " << max_ratio_file;
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return;
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}
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LOG(INFO) << "Writing " << max_ratio << " to " << max_ratio_file;
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if (!WriteStringToFd(std::to_string(max_ratio), fd)) {
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PLOG(ERROR) << "Failed to write to " << max_ratio_file;
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}
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}
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// Configures read ahead property of the fuse filesystem with the mount point |fuse_mount| by
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// writing |read_ahead_kb| to the /sys/class/bdi/MAJOR:MINOR/read_ahead_kb.
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void ConfigureReadAheadForFuse(const std::string& fuse_mount, size_t read_ahead_kb) {
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LOG(INFO) << "Configuring read_ahead of " << fuse_mount << " fuse filesystem to "
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<< read_ahead_kb << "kb";
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// First figure out MAJOR:MINOR of fuse_mount. Simplest way is to stat the path.
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struct stat info;
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if (stat(fuse_mount.c_str(), &info) != 0) {
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PLOG(ERROR) << "Failed to stat " << fuse_mount;
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std::string fuseBdiPath = getBdiPathForMount(fuse_mount);
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if (fuseBdiPath == "") {
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return;
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}
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unsigned int maj = major(info.st_dev);
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unsigned int min = minor(info.st_dev);
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LOG(INFO) << fuse_mount << " has major:minor " << maj << ":" << min;
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// We found major:minor of our filesystem, time to configure read ahead!
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std::string read_ahead_file = StringPrintf("/sys/class/bdi/%u:%u/read_ahead_kb", maj, min);
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// We found the bdi path for our filesystem, time to configure read ahead!
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std::string read_ahead_file = StringPrintf("%s/read_ahead_kb", fuseBdiPath.c_str());
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unique_fd fd(TEMP_FAILURE_RETRY(open(read_ahead_file.c_str(), O_WRONLY | O_CLOEXEC)));
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if (fd.get() == -1) {
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PLOG(ERROR) << "Failed to open " << read_ahead_file;
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