[PATCH RESEND v12] Add cli and ioctl to forget scanned device(s)

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

v12:
  Fixed coding style - leave space between " : ".

v11:
 btrfs-progs: Bring the code into the else part of if(forget).
	      Use strerror to print the erorr instead of ret.

v10:
 Make btrfs-progs changes more readable.
 With an effort to keep the known bug [1] as it is..
  [1]
   The cli 'btrfs device scan --all /dev/sdb' which should have scanned
    only one device, ends up scanning all the devices and I am not trying
    to fix this bug in this patch because..
  . -d|--all is marked as deprecated, I hope -d option would go away
  . For now some script might be using this bug as a feature, and fixing
    this bug might lead to mount failure.

v9:
 Make forget as a btrfs device scan option.
 Use forget in the fstests, now you can run fstests with btrfs as rootfs
  which helps to exercise the uuid_mutex lock.

v8:
 Change log update in the kernel patch.

v7:
 Use struct btrfs_ioctl_vol_args (instead of struct
  btrfs_ioctl_vol_args_v2) as its inline with other ioctl
  btrfs-control
 The CLI usage/features remains same. However internally the ioctl flag
  is not required to delete all the unmounted devices. Instead leave
  btrfs_ioctl_vol_args::name NULL.

v6:
 Use the changed fn name btrfs_free_stale_devices().

 Change in title:
 Old v5:
 Cover-letter:
  [PATCH v5] Add cli and ioctl to ignore a scanned device
 Kernel:
  [PATCH v5] btrfs: introduce feature to ignore a btrfs device
 Progs:
  [PATCH v5] btrfs-progs: add 'btrfs device ignore' cli

v5:
  Adds feature to delete all stale devices
  Reuses btrfs_free_stale_devices() fn and so depends on the
    patch-set [1] in the ML.
  Uses struct btrfs_ioctl_vol_args_v2 instead of
    struct btrfs_ioctl_vol_args as arg
  Does the device path matching instead of btrfs_device matching
    (we won't delete the mounted device as btrfs_free_stale_devices()
    checks for it)
v4:
  No change. But as the ML thread may be confusing, so resend.
v3:
  No change. Send to correct ML.
v2:
  Accepts review from Nikolay, details are in the specific patch.
  Patch 1/2 is renamed from
    [PATCH 1/2] btrfs: refactor btrfs_free_stale_device() to get device list delete
  to
    [PATCH 1/2] btrfs: add function to device list delete

Adds cli and ioctl to forget a scanned device or forget all stale
devices in the kernel.

Anand Jain (1):
  btrfs: introduce feature to forget a btrfs device

 fs/btrfs/super.c           | 3 +++
 fs/btrfs/volumes.c         | 9 +++++++++
 fs/btrfs/volumes.h         | 1 +
 include/uapi/linux/btrfs.h | 2 ++
 4 files changed, 15 insertions(+)

Anand Jain (1):
  btrfs-progs: add cli to forget one or all scanned devices

 cmds-device.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++---------
 ioctl.h       |  2 ++
 2 files changed, 56 insertions(+), 9 deletions(-)

[1]
Anand Jain (1):
  fstests: btrfs use forget if not reload

 common/btrfs    | 20 ++++++++++++++++++++
 tests/btrfs/124 |  6 +++---
 tests/btrfs/125 |  6 +++---
 tests/btrfs/154 |  6 +++---
 tests/btrfs/164 |  4 ++--
 5 files changed, 31 insertions(+), 11 deletions(-)

-- 
1.8.3.1