We have hit some transaction abort due to -ENOSPC internally.

Normally we should always reserve enough space for metadata for every
transaction, thus hitting -ENOSPC should really indicate some cases we
didn't expect.

But unfortunately current error reporting will only give a kernel
warning and stack trace, not really helpful to debug what's causing the
problem.

And mount option debug_enospc can only help when user can reproduce the
problem, but under most cases, such transaction abort by -ENOSPC is
really hard to reproduce.

So this patch will dump all space infos (data, metadata, system) when we
abort the first transaction with -ENOSPC.

This should at least provide some clue to us.

The example of a dump would look like this:

  BTRFS: Transaction aborted (error -28)
  WARNING: CPU: 8 PID: 3366 at fs/btrfs/transaction.c:2137 btrfs_commit_transaction+0xf81/0xfb0 [btrfs]
  <call trace skipped>
  ---[ end trace 0000000000000000 ]---
  BTRFS info (device dm-1: state A): dumping space info:
  BTRFS info (device dm-1: state A): space_info DATA has 6791168 free, is not full
  BTRFS info (device dm-1: state A): space_info total=8388608, used=1597440, pinned=0, reserved=0, may_use=0, readonly=0 zone_unusable=0
  BTRFS info (device dm-1: state A): space_info METADATA has 257114112 free, is not full
  BTRFS info (device dm-1: state A): space_info total=268435456, used=131072, pinned=180224, reserved=65536, may_use=10878976, readonly=65536 zone_unusable=0
  BTRFS info (device dm-1: state A): space_info SYSTEM has 8372224 free, is not full
  BTRFS info (device dm-1: state A): space_info total=8388608, used=16384, pinned=0, reserved=0, may_use=0, readonly=0 zone_unusable=0
  BTRFS info (device dm-1: state A): global_block_rsv: size 3670016 reserved 3670016
  BTRFS info (device dm-1: state A): trans_block_rsv: size 0 reserved 0
  BTRFS info (device dm-1: state A): chunk_block_rsv: size 0 reserved 0
  BTRFS info (device dm-1: state A): delayed_block_rsv: size 4063232 reserved 4063232
  BTRFS info (device dm-1: state A): delayed_refs_rsv: size 3145728 reserved 3145728
  BTRFS: error (device dm-1: state A) in btrfs_commit_transaction:2137: errno=-28 No space left
  BTRFS info (device dm-1: state EA): forced readonly
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>