Exporting ext4-specific information through fsinfo attributes

[David Howells <dhowells@xxxxxxxxxx>]

Hi Ted,

Whilst we were at Vault, I asked you if there was any live ext4 information
that it could be useful to export through fsinfo().  I've implemented a patch
that exports six superblock timestamps:

	FSINFO_ATTR_EXT4_TIMESTAMPS: 
		mkfs    : 2016-02-26 00:37:03
		mount   : 2020-03-31 21:57:30
		write   : 2020-03-31 21:57:28
		fsck    : 2018-12-17 23:32:45
		1st-err : -
		last-err: -

but is there anything else that could be of interest?

Thanks,
David