This patch-set adds DAX support to device-mapper dm-linear devices used by LVM. It works with LVM commands as follows: - Creation of a logical volume with all DAX capable devices (such as pmem) sets the logical volume DAX capable as well. - Once a logical volume is set to DAX capable, the volume may not be extended with non-DAX capable devices. The direct_access interface is added to dm and dm-linear to map a request to a target device. - Patch 1-2 introduce GENHD_FL_DAX flag to indicate DAX capability. - Patch 3-4 add direct_access functions to dm and dm-linear. - Patch 5-6 set GENHD_FL_DAX to dm when all targets are DAX capable. --- Toshi Kani (6): 1/6 genhd: Add GENHD_FL_DAX to gendisk flags 2/6 block: Check GENHD_FL_DAX for DAX capability 3/6 dm: Add dm_blk_direct_access() for mapped device 4/6 dm-linear: Add linear_direct_access() 5/6 dm, dm-linear: Add dax_supported to dm_target 6/6 dm: Enable DAX support for mapper device --- drivers/block/brd.c | 2 +- drivers/md/dm-linear.c | 19 +++++++++++++++++++ drivers/md/dm-table.c | 12 +++++++++--- drivers/md/dm.c | 38 ++++++++++++++++++++++++++++++++++++-- drivers/md/dm.h | 7 +++++++ drivers/nvdimm/pmem.c | 2 +- drivers/s390/block/dcssblk.c | 1 + fs/block_dev.c | 5 +++-- include/linux/device-mapper.h | 15 +++++++++++++++ include/linux/genhd.h | 2 +- 10 files changed, 93 insertions(+), 10 deletions(-) -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
