[dm-devel] [PATCH 0/2] block: blk_interposer v3

[Sergei Shtepa]

Hi all,

I`m ready to suggest the blk_interposer again.
blk_interposer allows to intercept bio requests, remap bio to
another devices or add new bios.

This version has support from device mapper.

For the dm-linear device creation command, the `noexcl` parameter
has been added, which allows to open block devices without
FMODE_EXCL mode. It allows to create dm-linear device on a block
device with an already mounted file system.
The new ioctl DM_DEV_REMAP allows to enable and disable bio
interception.

Thus, it is possible to add the dm-device to the block layer stack
without reconfiguring and rebooting.


Sergei Shtepa (2):
  block: blk_interposer
  [dm] blk_interposer for dm-linear

 block/bio.c                   |   2 +
 block/blk-core.c              |  29 +++
 block/blk-mq.c                |  13 ++
 block/genhd.c                 |  82 ++++++++
 drivers/md/dm-core.h          |  46 +++-
 drivers/md/dm-ioctl.c         |  39 ++++
 drivers/md/dm-linear.c        |  17 +-
 drivers/md/dm-table.c         |  12 +-
 drivers/md/dm.c               | 383 ++++++++++++++++++++++++++++++++--
 drivers/md/dm.h               |   2 +-
 include/linux/blk-mq.h        |   1 +
 include/linux/blk_types.h     |   6 +-
 include/linux/device-mapper.h |   7 +
 include/linux/genhd.h         |  19 ++
 include/uapi/linux/dm-ioctl.h |  15 +-
 15 files changed, 643 insertions(+), 30 deletions(-)

-- 
2.20.1