I've formatted a new filesystem with and without extents feature just to understand how this feature works. However, when I look at the inode field i_flags I see that this field always has zero value (for used inodes 2, 7 and 11).Documentation (from Kernel.org) about extents says, that this flag should have 0x80000 bit set for inodes which use extents - but it looks like it's not accurate.Can I have inodes with and without extents in the same filesystem? Should I rely on the i_flags to determine the way, how the i_block field is used? Or it is just one filesystem-wide flag in the superblock which dictates extents usage for all inodes?
ext4 flags to specify extents mode?
ext4