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SubjectRe: bcache with existing ext4 filesystem
On Tue, Jul 25, 2017 at 03:46:04PM +0200, Pavel Machek wrote:
>
> Is there some field in ext2 superblock that changes every time
> filesystem is changed? Is mtime changed by fsck/badblocks/...?

No, there isn't. If we were writing the superblock every time the
file system is changed it would be ***extremely*** flash unfriendly.
It would also be a scalability bottleneck, it would cause us to pay an
extra HDD seek, etc. So it's a really bad Bad BAD idea, and so we
don't do it.

Cheers,

- Ted

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