[PATCH 2/2 V2] xfs_db: add crc manipulation commands

[Eric Sandeen]

On 9/16/14 10:29 AM, Eric Sandeen wrote:
> This adds a new "crc" command to xfs_db for CRC-enabled filesystems.
> 
> If a structure has a CRC field, we can validate it, invalidate/corrupt
> it, or revalidate/rewrite it:
> 
> xfs_db> sb 0
> xfs_db> crc -v
> crc = 0x796c814f (correct)
> xfs_db> crc -i
> Metadata CRC error detected at block 0x0/0x200
> crc = 0x796c8150 (bad)
> xfs_db> crc -r
> crc = 0x796c814f (correct)

On reflection, do you think these should be more verbose, something like:

xfs_db> sb 0
xfs_db> crc -v
Validating crc:
crc = 0x796c814f (correct)
xfs_db> crc -i
Invalidating CRC:
Metadata CRC error detected at block 0x0/0x200
crc = 0x796c8150 (bad)
xfs_db> crc -r
Rewriting CRC:
crc = 0x796c814f (correct)