[PATCH 00/12] btrfs: async discard follow up

[Dennis Zhou <dennis@kernel.org>]

Hello,

Dave applied 1-12 from v6 [1]. This is a follow up cleaning up the
remaining 10 patches adding 2 more to deal with a rare -1 [2] that I
haven't quite figured out how to repro. This is also available at [3].

This series is on top of btrfs-devel#misc-next-with-discard-v6 0c7be920bd7d.

[1] https://lore.kernel.org/linux-btrfs/cover.1576195673.git.dennis@kernel.org/
[2] https://lore.kernel.org/linux-btrfs/20191217145541.GE3929@suse.cz/
[3] https://git.kernel.org/pub/scm/linux/kernel/git/dennis/misc.git/log/?h=async-discard

Dennis Zhou (12):
  btrfs: calculate discard delay based on number of extents
  btrfs: add bps discard rate limit for async discard
  btrfs: limit max discard size for async discard
  btrfs: make max async discard size tunable
  btrfs: have multiple discard lists
  btrfs: only keep track of data extents for async discard
  btrfs: keep track of discard reuse stats
  btrfs: add async discard header
  btrfs: increase the metadata allowance for the free_space_cache
  btrfs: make smaller extents more likely to go into bitmaps
  btrfs: ensure removal of discardable_* in free_bitmap()
  btrfs: add correction to handle -1 edge case in async discard

 fs/btrfs/block-group.h      |   7 +
 fs/btrfs/ctree.h            |  10 +-
 fs/btrfs/discard.c          | 258 +++++++++++++++++++++++++++++++++---
 fs/btrfs/discard.h          |  12 ++
 fs/btrfs/extent-tree.c      |   4 +-
 fs/btrfs/free-space-cache.c | 154 +++++++++++++++------
 fs/btrfs/free-space-cache.h |   2 +-
 fs/btrfs/sysfs.c            | 129 ++++++++++++++++++
 8 files changed, 519 insertions(+), 57 deletions(-)

Thanks,
Dennis