DAX PMDs have been disabled since Jan Kara introduced DAX radix tree based locking. This series allows DAX PMDs to participate in the DAX radix tree based locking scheme so that they can be re-enabled. Changes since v1: - PMD entry locking is now done based on the starting offset of the PMD entry, rather than on the radix tree slot which was unreliable. (Jan) - Fixed the one issue I could find with hole punch. As far as I can tell hole punch now works correctly for both PMD and PTE DAX entries, 4k zero pages and huge zero pages. - Fixed the way that ext2 returns the size of holes in ext2_get_block(). (Jan) - Made the 'wait_table' global variable static in respnse to a sparse warning. - Fixed some more inconsitent usage between the names 'ret' and 'entry' for radix tree entry variables. Ross Zwisler (9): ext4: allow DAX writeback for hole punch ext2: tell DAX the size of allocation holes ext4: tell DAX the size of allocation holes dax: remove buffer_size_valid() dax: make 'wait_table' global variable static dax: consistent variable naming for DAX entries dax: coordinate locking for offsets in PMD range dax: re-enable DAX PMD support dax: remove "depends on BROKEN" from FS_DAX_PMD fs/Kconfig | 1 - fs/dax.c | 297 +++++++++++++++++++++++++++++----------------------- fs/ext2/inode.c | 3 + fs/ext4/inode.c | 7 +- include/linux/dax.h | 29 ++++- mm/filemap.c | 6 +- 6 files changed, 201 insertions(+), 142 deletions(-) -- 2.9.0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>