We need to be able to know if and where the image is sparse during backups. Implement blockdev and dm infrastructure, add an ability to find holes for dm-qcow2, dm-ploop, dm-push-backup After this patches llseek with SEEK_HOLES and SEEK_DATA can be used with block devices
Feature: dm: implement SEEK_HOLE for dm-qcow2 and dm-ploop v2: - s/find_hole/llseek_hole/ - add new patch with calc_front_qio_bytes() helper - rework dm-qcow2 llseek_hole function v3: - add new helper blkdev_llseek_wrapper() to cover common edge cases - rework calc_front_qio_bytes() to increase clarity Andrey Zhadchenko (8): block/fops: add llseek_hole to blockdevops dm: add llseek_hole infrastructure dm/push_backup: add llseek_hole proxy dm/dm-qcow2: add calc_front_qio_bytes() helper dm/dm-qcow2: add llseek_hole dm/dm-ploop: reinforce some defines dm/dm-ploop: allow to check if cluster is locked dm/dm-ploop: add llseek_hole block/fops.c | 38 +++++ drivers/md/dm-ploop-map.c | 44 ++++- drivers/md/dm-ploop-target.c | 1 + drivers/md/dm-ploop.h | 9 +- drivers/md/dm-push-backup.c | 12 ++ drivers/md/dm-qcow2-map.c | 297 ++++++++++++++++++++++++++++++++-- drivers/md/dm-qcow2-target.c | 1 + drivers/md/dm-qcow2.h | 2 + drivers/md/dm.c | 41 +++++ include/linux/blkdev.h | 1 + include/linux/device-mapper.h | 4 + 11 files changed, 432 insertions(+), 18 deletions(-) -- 2.39.3 _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel
