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btrfs: add new flushing states for the delayed refs rsv

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A nice thing we gain with the delayed refs rsv is the ability to flush
the delayed refs on demand to deal with enospc pressure.  Add states to
flush delayed refs on demand, and this will allow us to remove a lot of
ad-hoc work around checking to see if we should commit the transaction
to run our delayed refs.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2018-12-03 10:20:35 -05:00 • committed by David Sterba
commit 413df7252d
3 changed files with 22 additions and 4 deletions
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2
include/trace/events/btrfs.h
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@ -1048,6 +1048,8 @@ TRACE_EVENT(btrfs_trigger_flush,
{ FLUSH_DELAYED_ITEMS, "FLUSH_DELAYED_ITEMS"}, \
{ FLUSH_DELALLOC, "FLUSH_DELALLOC"}, \
{ FLUSH_DELALLOC_WAIT, "FLUSH_DELALLOC_WAIT"}, \
{ FLUSH_DELAYED_REFS_NR, "FLUSH_DELAYED_REFS_NR"}, \
{ FLUSH_DELAYED_REFS, "FLUSH_ELAYED_REFS"}, \
{ ALLOC_CHUNK, "ALLOC_CHUNK"}, \
{ COMMIT_TRANS, "COMMIT_TRANS"})