Re: [RFC 0/9] block: add llseek(SEEK_HOLE/SEEK_DATA) support

Christoph Hellwig
2024-04-02T12:26:26Z

On Thu, Mar 28, 2024 at 04:39:01PM -0400, Stefan Hajnoczi wrote:
> In the block device world there are similar concepts to holes:
> - SCSI has Logical Block Provisioning where the "mapped" state would be
> considered data and other states would be considered holes.

But for SCSI (and ATA and NVMe) unmapped/delallocated/etc blocks do
not have to return zeroes. They could also return some other
initialization pattern pattern. So they are (unfortunately) not a 1:1
mapping to holes in sparse files.