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btrfs: introduce a FORCE_COMMIT_TRANS flush operation

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Solely for preemptive flushing, we want to be able to force the
transaction commit without any of the ambiguity of
may_commit_transaction().  This is because may_commit_transaction()
checks tickets and such, and in preemptive flushing we already know
it'll be helpful, so use this to keep the code nice and clean and
straightforward.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
[ add comment ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik
2020-10-09 09:28:21 -04:00
committed by David Sterba
parent 5deb17e18e
commit f00c42dd4c
3 changed files with 17 additions and 1 deletions
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3
include/trace/events/btrfs.h
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@@ -99,7 +99,8 @@ struct btrfs_space_info;
EM( ALLOC_CHUNK, "ALLOC_CHUNK") \
EM( ALLOC_CHUNK_FORCE, "ALLOC_CHUNK_FORCE") \
EM( RUN_DELAYED_IPUTS, "RUN_DELAYED_IPUTS") \
EMe(COMMIT_TRANS, "COMMIT_TRANS")
EM( COMMIT_TRANS, "COMMIT_TRANS") \
EMe(FORCE_COMMIT_TRANS, "FORCE_COMMIT_TRANS")
/*
* First define the enums in the above macros to be exported to userspace via