btrfs: do not infinite loop in data reclaim if we aborted

btrfs: do not infinite loop in data reclaim if we aborted

Error injection stressing uncovered a busy loop in our data reclaim
loop.  There are two cases here, one where we loop creating block groups
until space_info->full is set, or in the main loop we will skip erroring
out any tickets if space_info->full == 0.  Unfortunately if we aborted
the transaction then we will never allocate chunks or reclaim any space
and thus never get ->full, and you'll see stack traces like this:

  watchdog: BUG: soft lockup - CPU#0 stuck for 26s! [kworker/u4:4:139]
  CPU: 0 PID: 139 Comm: kworker/u4:4 Tainted: G        W         5.13.0-rc1+ #328
  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-2.fc32 04/01/2014
  Workqueue: events_unbound btrfs_async_reclaim_data_space
  RIP: 0010:btrfs_join_transaction+0x12/0x20
  RSP: 0018:ffffb2b780b77de0 EFLAGS: 00000246
  RAX: ffffb2b781863d58 RBX: 0000000000000000 RCX: 0000000000000000
  RDX: 0000000000000801 RSI: ffff987952b57400 RDI: ffff987940aa3000
  RBP: ffff987954d55000 R08: 0000000000000001 R09: ffff98795539e8f0
  R10: 000000000000000f R11: 000000000000000f R12: ffffffffffffffff
  R13: ffff987952b574c8 R14: ffff987952b57400 R15: 0000000000000008
  FS:  0000000000000000(0000) GS:ffff9879bbc00000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 00007f0703da4000 CR3: 0000000113398004 CR4: 0000000000370ef0
  Call Trace:
   flush_space+0x4a8/0x660
   btrfs_async_reclaim_data_space+0x55/0x130
   process_one_work+0x1e9/0x380
   worker_thread+0x53/0x3e0
   ? process_one_work+0x380/0x380
   kthread+0x118/0x140
   ? __kthread_bind_mask+0x60/0x60
   ret_from_fork+0x1f/0x30

Fix this by checking to see if we have a btrfs fs error in either of the
reclaim loops, and if so fail the tickets and bail.  In addition to
this, fix maybe_fail_all_tickets() to not try to grant tickets if we've
aborted, simply fail everything.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>