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Log reason for fuse-bpf being enabled/disabled

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Also don't try to set ro.fuse.bpf.is_running if it's already set.

Bug: 278263648
Ignore-AOSP-First: Feature is in internal
Test: Examine logs with various properties set
Change-Id: I9623a02c7065fa0d0c71c618d448bda0cd2a900e
This commit is contained in:
Paul Lawrence 2023-04-14 10:06:49 -07:00
parent ee0a2bf52e
commit 9adf86a881
1 changed files with 35 additions and 17 deletions
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52
Utils.cpp
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@ -1771,27 +1771,45 @@ std::pair<android::base::unique_fd, std::string> OpenDirInProcfs(std::string_vie
return {std::move(fd), std::move(linkPath)};
}
bool IsFuseBpfEnabled() {
bool enabled;
std::string contents;
static bool IsPropertySet(const char* name, bool& value) {
if (base::GetProperty(name, "") == "") return false;
if (base::GetProperty("ro.fuse.bpf.is_running", "") != "")
enabled = base::GetBoolProperty("ro.fuse.bpf.is_running", false);
else if (base::GetProperty("persist.sys.fuse.bpf.override", "") != "")
enabled = base::GetBoolProperty("persist.sys.fuse.bpf.override", false);
else if (base::GetProperty("ro.fuse.bpf.enabled", "") != "")
enabled = base::GetBoolProperty("ro.fuse.bpf.enabled", false);
else
enabled = base::ReadFileToString("/sys/fs/fuse/features/fuse_bpf", &contents) &&
contents == "supported\n";
if (enabled) {
base::SetProperty("ro.fuse.bpf.is_running", "true");
value = base::GetBoolProperty(name, false);
LOG(INFO) << "fuse-bpf is " << (value ? "enabled" : "disabled") << " because of property "
<< name;
return true;
}
bool IsFuseBpfEnabled() {
// This logic is reproduced in packages/providers/MediaProvider/jni/FuseDaemon.cpp
// so changes made here must be reflected there
bool enabled = false;
if (IsPropertySet("ro.fuse.bpf.is_running", enabled)) return enabled;
if (!IsPropertySet("persist.sys.fuse.bpf.override", enabled) &&
!IsPropertySet("ro.fuse.bpf.enabled", enabled)) {
// If the kernel has fuse-bpf, /sys/fs/fuse/features/fuse_bpf will exist and have the
// contents 'supported\n' - see fs/fuse/inode.c in the kernel source
std::string contents;
const char* filename = "/sys/fs/fuse/features/fuse_bpf";
if (!base::ReadFileToString(filename, &contents)) {
LOG(INFO) << "fuse-bpf is disabled because " << filename << " cannot be read";
enabled = false;
} else if (contents == "supported\n") {
LOG(INFO) << "fuse-bpf is enabled because " << filename << " reads 'supported'";
enabled = true;
} else {
base::SetProperty("ro.fuse.bpf.is_running", "false");
return false;
LOG(INFO) << "fuse-bpf is disabled because " << filename
<< " does not read 'supported'";
enabled = false;
}
}
std::string value = enabled ? "true" : "false";
LOG(INFO) << "Setting ro.fuse.bpf.is_running to " << value;
base::SetProperty("ro.fuse.bpf.is_running", value);
return enabled;
}
} // namespace vold