[PATCH 0/3 v2] flags to access backup SB

[Anand Jain <anand.jain@oracle.com>]

The bug as seen in the last patch below,
indicates that we need a mechanisum to tell when to use
the backup super_block. To do this it needs a frame-work,
and the patch #1 and #2 below provides the same without
change in the logic. The last patch uses the framework to
fix the bug.

v1->v2:
	Accepts Eric and Zach review.
        Seprates fix into 3 patches for easy logical understanding

Anand Jain (3):
  btrfs-progs: Introduce flag BTRFS_SCAN_REGISTER to replace run_ioctl
  btrfs-progs: Introduce flag BTRFS_SCAN_BACKUP_SB for
    btrfs_read_dev_super
  btrfs-progs: use BTRFS_SCAN_BACKUP_SB flag in btrfs_scan_one_device

 btrfsctl.c        |  2 +-
 cmds-device.c     |  5 +++--
 cmds-filesystem.c |  2 +-
 cmds-replace.c    |  3 ++-
 disk-io.c         | 16 +++++++++++-----
 disk-io.h         |  3 ++-
 find-root.c       |  9 ++++++---
 utils.c           | 26 +++++++++++++++-----------
 utils.h           |  8 +++++---
 volumes.c         |  6 ++++--
 volumes.h         |  2 +-
 11 files changed, 51 insertions(+), 31 deletions(-)

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1.8.1.191.g414c78c