Add a 4KB membuf to record ext4 messages for later retrieval. This
allows programmatic access to filesystem messages without requiring
CONFIG_EXT4L_DEBUG to be enabled.
- Add ext4l_msg_buf and ext4l_msg_data in interface.c
- Add ext4l_record_msg() to record messages
- Add ext4l_get_msg_buf() to access the buffer
- Modify __ext4_msg() to always record messages, print only if debug
Note that this increases the number of strings in the ext4l
implementation. For production it might be useful to make this an
option, although the messages can be quite important.
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
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