Device delete by id

Hi,

this patchset extends the ioctl arugments to take an id so we can delete a device by it. It reuses the existing structure btrfs_ioctl_vol_args_v2 and extends it in na backward-compatible way so that we don't need to introduce another one.

The core patchset is from Anand, I did some cleanups as I went through the series again and made some cleanups and minor naming tweaks to the interface.

I'll add the branch to for-next and if everything goes fine I'll send a pull request for 4.6 in a week.

Anand Jain (9):
btrfs: create a helper function to read the disk super
btrfs: create helper function __check_raid_min_devices()
btrfs: clean up and optimize __check_raid_min_device()
btrfs: create helper btrfs_find_device_by_user_input()
btrfs: make use of btrfs_find_device_by_user_input()
btrfs: enhance btrfs_find_device_by_user_input() to check device path
btrfs: make use of btrfs_scratch_superblocks() in btrfs_rm_device()
btrfs: introduce device delete by devid
btrfs: optimize check for stale device

David Sterba (6):
btrfs: rename __check_raid_min_devices
btrfs: pass number of devices to btrfs_check_raid_min_devices
btrfs: indtroduce raid-type to error-code table, for minimum device
constraint
btrfs: use existing device constraints table btrfs_raid_array
btrfs: rename btrfs_find_device_by_user_input
btrfs: rename flags for vol args v2

 fs/btrfs/dev-replace.c     |  28 +---
 fs/btrfs/ioctl.c           |  58 +++++++-
 fs/btrfs/volumes.c         | 322 ++++++++++++++++++++++-----------------------
 fs/btrfs/volumes.h         |   7 +-
 include/uapi/linux/btrfs.h |  15 ++-
 5 files changed, 233 insertions(+), 197 deletions(-)

2.7.1