[PATCH btrfs-progs 0/2] balance: check balance errors on background

[Marcos Paulo de Souza <marcos.souza.org@gmail.com>]

From: Marcos Paulo de Souza <mpdesouza@suse.com>

The first patch removes the close/open operation of stderr, so we can receive
errors of balance when starting in the background.

The second patch waits up to three seconds after started the balance process, to
check is some problem happened to the balance process. This is done only when
the user issues the "balance start" in background mode.

This was tested by issuing running "btrfs balance start --background
--full-balance <path>", when the balance started, issue the same command again
in the same terminal:

# ./btrfs balance start --background --full-balance /mnt
# ./btrfs balance start --background --full-balance /mnt
ERROR: error during balancing '/mnt': Operation now in progress

These two patches together fixes the issue 167[1].

Please review,
Thanks.

[1]: https://github.com/kdave/btrfs-progs/issues/167

Marcos Paulo de Souza (2):
  btrfs-progs: balance: Don't set stderr to /dev/null on balance_start
  btrfs-progs: balance: Verify EINPROGRESS on background balance

 cmds/balance.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

-- 
2.23.0