Downgrade DM debugging messages to trace level

Commit 66e1fdf added logging to the DM module using the debug!
macro.

In practice these messages can be very noisy, especially for e.g.
in the Stratis test suite (which calls the status() method on thin pool
devices). This leads to lots of messages like the following:

[2023-11-06T16:01:05Z DEBUG devicemapper::core::dm] Retrieving table status for stratis-1-private-50db9929d265403b820bb155c8f5ae89-thinpool-pool

Running the Stratis test suite results in hundreds of these messages
being logged at debug level.

Downgrade the logging calls in the DM module from debug! to trace!
to quiet this down.

Author: bmr-cymru

src/core/dm.rs

@@ -384,7 +384,7 @@ impl DM {
         match retry_with_index(
             Fixed::from_millis(DM_REMOVE_MSLEEP_DELAY).take(DM_REMOVE_RETRIES - 1),
             |i| {
-                debug!("Device remove attempt {} of {}", i, DM_REMOVE_RETRIES);
+                trace!("Device remove attempt {} of {}", i, DM_REMOVE_RETRIES);
                 self.try_device_remove(id, options)
             },
         ) {
@@ -469,7 +469,7 @@ impl DM {
     pub fn device_info(&self, id: &DevId<'_>) -> DmResult<DeviceInfo> {
         let mut hdr = DmOptions::default().to_ioctl_hdr(Some(id), DmFlags::empty())?;
 
-        debug!("Retrieving info for {}", id);
+        trace!("Retrieving info for {}", id);
         self.do_ioctl(dmi::DM_DEV_STATUS_CMD as u8, &mut hdr, None)
             .map(|(hdr, _)| hdr)
     }
@@ -489,7 +489,7 @@ impl DM {
     ) -> DmResult<(DeviceInfo, Vec<(u64, u64, String, String)>)> {
         let mut hdr = options.to_ioctl_hdr(Some(id), DmFlags::DM_QUERY_INACTIVE_TABLE)?;
 
-        debug!("Waiting on event for {}", id);
+        trace!("Waiting on event for {}", id);
         let (hdr_out, data_out) = self.do_ioctl(dmi::DM_DEV_WAIT_CMD as u8, &mut hdr, None)?;
 
         let status = DM::parse_table_status(hdr.target_count, &data_out)?;
@@ -577,7 +577,7 @@ impl DM {
         // Flatten targets into a buf
         let data_in = cursor.into_inner();
 
-        debug!("Loading table \"{:?}\" for {}", targets, id);
+        trace!("Loading table \"{:?}\" for {}", targets, id);
         self.do_ioctl(dmi::DM_TABLE_LOAD_CMD as u8, &mut hdr, Some(&data_in))
             .map(|(hdr, _)| hdr)
     }
@@ -586,7 +586,7 @@ impl DM {
     pub fn table_clear(&self, id: &DevId<'_>) -> DmResult<DeviceInfo> {
         let mut hdr = DmOptions::default().to_ioctl_hdr(Some(id), DmFlags::empty())?;
 
-        debug!("Clearing inactive dable for {}", id);
+        trace!("Clearing inactive table for {}", id);
         self.do_ioctl(dmi::DM_TABLE_CLEAR_CMD as u8, &mut hdr, None)
             .map(|(hdr, _)| hdr)
     }
@@ -601,7 +601,7 @@ impl DM {
     pub fn table_deps(&self, id: &DevId<'_>, options: DmOptions) -> DmResult<Vec<Device>> {
         let mut hdr = options.to_ioctl_hdr(Some(id), DmFlags::DM_QUERY_INACTIVE_TABLE)?;
 
-        debug!("Querying dependencies for {}", id);
+        trace!("Querying dependencies for {}", id);
         let (_, data_out) = self.do_ioctl(dmi::DM_TABLE_DEPS_CMD as u8, &mut hdr, None)?;
 
         if data_out.is_empty() {
@@ -707,7 +707,7 @@ impl DM {
             DmFlags::DM_NOFLUSH | DmFlags::DM_STATUS_TABLE | DmFlags::DM_QUERY_INACTIVE_TABLE,
         )?;
 
-        debug!("Retrieving table status for {}", id);
+        trace!("Retrieving table status for {}", id);
         let (hdr_out, data_out) = self.do_ioctl(dmi::DM_TABLE_STATUS_CMD as u8, &mut hdr, None)?;
 
         let status = DM::parse_table_status(hdr_out.target_count, &data_out)?;
@@ -721,7 +721,7 @@ impl DM {
     pub fn list_versions(&self) -> DmResult<Vec<(String, u32, u32, u32)>> {
         let mut hdr = DmOptions::default().to_ioctl_hdr(None, DmFlags::empty())?;
 
-        debug!("Listing loaded target versions");
+        trace!("Listing loaded target versions");
         let (_, data_out) = self.do_ioctl(dmi::DM_LIST_VERSIONS_CMD as u8, &mut hdr, None)?;
 
         let mut targets = Vec::new();
@@ -805,7 +805,7 @@ impl DM {
     pub fn arm_poll(&self) -> DmResult<DeviceInfo> {
         let mut hdr = DmOptions::default().to_ioctl_hdr(None, DmFlags::empty())?;
 
-        debug!("Issuing device-mapper arm poll command");
+        trace!("Issuing device-mapper arm poll command");
         self.do_ioctl(dmi::DM_DEV_ARM_POLL_CMD as u8, &mut hdr, None)
             .map(|(hdr, _)| hdr)
     }