On Wed, May 11, 2022 at 02:33:01PM -0500, Steve French wrote: > Was investigating trying to fix emulation of some fallocate flags, and > was wondering how common is it for a fs to very loosely report > allocation size (st_blocks) for a file - ie the allocation sizes does > not match the allocate ranges returned by fiemap (or > SEEK_HOLE/SEEK_DATA). Presumably there are Linux fs that coalesce > ranges on the fly so allocation sizes may be a 'guess' for some fs. > > How common is this for it to be off? Very common -- XFS reports /all/ file block usage in st_blocks, including the extent mapping trees and staging areas for copy on write. --D > -- > Thanks, > > Steve
