On Fri, Jun 30, 2017 at 1:51 PM, Andreas Gruenbacher
[off-list ref] wrote:

On Thu, Jun 29, 2017 at 3:54 PM, Christoph Hellwig [off-list ref] wrote:

quoted

Switch to the iomap_seek_hole and iomap_seek_data helpers for
implementing lseek SEEK_HOLE / SEEK_DATA, and remove all the
code that isn't needed any more.

Note that with this patch ext4 will now always depend on the iomap
code instead of only when CONFIG_DAX is enabled, and it requires
adding a call into the extent status tree for iomap_begin as well
to properly deal with delalloc extents.

This breaks SEEK_HOLE / SEEK_DATA on filesystems with the inline_data feature.

Also, ext4 no longer calls inode_lock or inode_lock_shared; that needs
to be added back for consistency between reading i_size and walking
the file extents.

Same on xfs, btw.

Thanks,
Andreas