bug#79267: cp --sparse=auto heuristic fails on a squashfs mounted drive.

Phillip Lougher <[email protected]>
Newsgroups gmane.comp.gnu.core-utils.bugs
Message-ID <[email protected]> 
Padraig Brady wrote:

 > with --sparse=always. squashfs is giving the wrong info here after 
all, right?

No Squashfs is not giving the wrong information here.

Support for SEEK_HOLE/SEEK_DATA is not mandated, and no Linux filesystem 
is required to support it.

What you are seeing here is the default Linux VFS behaviour.

See 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/read_write.c#n102

Phillip

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Squashfs author and maintainer
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