Re: [PATCH 2/3] mm: Provide address_space operation for filling pages for read

On Wed, Jan 20, 2021 at 06:27:05PM +0100, Jan Kara wrote:

This would mean pulling i_mmap_sem out from ext4/XFS/F2FS private inode
into the VFS inode. Which is fine by me but it would grow struct inode for
proc / tmpfs / btrfs (although for btrfs I'm not convinced it isn't
actually prone to the race and doesn't need similar protection as xfs /
ext4) so some people may object.

The btrfs folks are already looking into lifting it to common code.

Also I have a patch pending to remove a list_head from the inode to
counter the size increase :)