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fstests: btrfs: Add reserved space leak check for rewrite dirty page

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Btrfs qgroup reserve codes lacks check for rewrite dirty page, causing
every write, even rewriting a uncommitted dirty page, to reserve space.

But only written data will free the reserved space, causing reserved
space leaking.

The bug exists almost from the beginning of btrfs qgroup codes, but
nobody found it.

For example:

1)Write [0, 12K) into file A
  reserve 12K space

File A:
0	4K	8K	12K
|<--------dirty-------->|
reserved: 12K

2)Write [0,4K) into file A
0	4K	8K	12K
|<--------dirty-------->|
reserved: 16K <<< Should be 12K

3) Commit transaction
Dirty pages [0,12) written to disk.
Free 12K reserved space.
reserved: 4K <<< Should be 0

This testcase will test such problem.
Kernel fix will need some huge change, so won't be soon.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
This commit is contained in:
Qu Wenruo
2015-09-21 13:06:18 +10:00
committed by Dave Chinner
parent dbbaa6d4bc
commit 04188a67ae
3 changed files with 102 additions and 0 deletions
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tests/btrfs/099.out
+13
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@@ -0,0 +1,13 @@
QA output created by 099
wrote 33554432/33554432 bytes at offset 0
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 33554432/33554432 bytes at offset 0
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 33554432/33554432 bytes at offset 0
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 33554432/33554432 bytes at offset 0
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 33554432/33554432 bytes at offset 0
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 132120576/132120576 bytes at offset 0
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)