libdm: fetch and present device status flags
Fetch detailed information for devices through its flags and store in
helper Info class, i.e.:
- active
- access
- activeTable
- inactiveTable
- bufferFull
Change-Id: I3241c5bca00e038d19f99390f40710ca7cff8456
Bug: 137759376
Test: manual test
Signed-off-by: Alessio Balsini <balsini@google.com>
diff --git a/fs_mgr/libdm/dm.cpp b/fs_mgr/libdm/dm.cpp
index 1d2683a..a4e0d76 100644
--- a/fs_mgr/libdm/dm.cpp
+++ b/fs_mgr/libdm/dm.cpp
@@ -150,6 +150,15 @@
return true;
}
+std::optional<DeviceMapper::Info> DeviceMapper::GetDetailedInfo(const std::string& name) const {
+ struct dm_ioctl io;
+ InitIo(&io, name);
+ if (ioctl(fd_, DM_DEV_STATUS, &io) < 0) {
+ return std::nullopt;
+ }
+ return Info(io.flags);
+}
+
DmDeviceState DeviceMapper::GetState(const std::string& name) const {
struct dm_ioctl io;
InitIo(&io, name);
diff --git a/fs_mgr/libdm/include/libdm/dm.h b/fs_mgr/libdm/include/libdm/dm.h
index 753b8c9..c6b37cf 100644
--- a/fs_mgr/libdm/include/libdm/dm.h
+++ b/fs_mgr/libdm/include/libdm/dm.h
@@ -27,6 +27,7 @@
#include <chrono>
#include <memory>
+#include <optional>
#include <string>
#include <utility>
#include <vector>
@@ -70,10 +71,27 @@
uint64_t dev_;
};
+ class Info {
+ uint32_t flags_;
+
+ public:
+ explicit Info(uint32_t flags) : flags_(flags) {}
+
+ bool IsActiveTablePresent() const { return flags_ & DM_ACTIVE_PRESENT_FLAG; }
+ bool IsBufferFull() const { return flags_ & DM_BUFFER_FULL_FLAG; }
+ bool IsInactiveTablePresent() const { return flags_ & DM_INACTIVE_PRESENT_FLAG; }
+ bool IsReadOnly() const { return flags_ & DM_READONLY_FLAG; }
+ bool IsSuspended() const { return flags_ & DM_SUSPEND_FLAG; }
+ };
+
// Removes a device mapper device with the given name.
// Returns 'true' on success, false otherwise.
bool DeleteDevice(const std::string& name);
+ // Fetches and returns the complete state of the underlying device mapper
+ // device with given name.
+ std::optional<Info> GetDetailedInfo(const std::string& name) const;
+
// Returns the current state of the underlying device mapper device
// with given name.
// One of INVALID, SUSPENDED or ACTIVE.