[PATCH] dump device list as seen by the kernel

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

For debugging we need a way to understand what kernel
thinks about the devices under its control mainly 
when device disappear and reappear.

The current btrfs-progs sub commands wouldn't help because
the output from the kernel is greatly fine tuned before
printing on the terminal and in some cases provides 
wrong a view (more on it later) as well.

So here I wrote a code to dump fs_devices for the kernel,
the implementation here uses ioctl rather than
memory dumps, as we need this ioctl to fix btrfs subcommands
as well.


Anand Jain (1):
  btrfs: introduce BTRFS_IOC_GET_DEVS

 fs/btrfs/super.c           |   56 +++++++++++++++++++++++++
 fs/btrfs/volumes.c         |   99 ++++++++++++++++++++++++++++++++++++++++++++
 fs/btrfs/volumes.h         |    2 +
 include/uapi/linux/btrfs.h |   45 ++++++++++++++++++++
 4 files changed, 202 insertions(+), 0 deletions(-)