[LU-16029] lr_reader: add options to read raw file (last_rcvd, reply_data)

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0
• Assignee: Etienne Aujames
• Reporter: Etienne Aujames

Description

This ticket adds the following usages to extract data directly from last_rcvd or reply_data dump files:

# save raw file from ldiskfs filesystem
debugfs -c -R "dump reply_data /tmp/reply_data" /dev/mapper/mds1_flakey
debugfs -c -R "dump last_rcvd /tmp/last_rcvd" /dev/mapper/mds1_flakey

# read and decode the files
lr_reader -cr -C /tmp/last_rcvd -R /tmp/reply_data
...