On 23/08/2025 17:46, Paul Eggert wrote:
On 2025-08-22 19:11, Phillip Lougher wrote:
any Squashfs SEEK_HOLE/SEEK_DATA implementation will not
behave like other Linux filesystems, because it won't report sparseness
at the 4K granularity that most people or programs will expect it to.
Coreutils doesn't expect 4 KiB granularity for LSEEK_DATA+LSEEK_HOLE,
and I don't know of any programs that do expect it. I fail to see why
squashfs should penalize the performance of core programs like 'cp'
merely because some (which?) programs are poorly written.
As far as Squashfs is concerned SEEK_HOLE/SEEK_DATA is easy to
implement. So I'll think about adding it as a build option.
But this isn't going to fix it for any other case.
Phillip
