btrfs: Fix bugs in zlib workspace
- Fix a race that can result in alloc_workspace > cpus.
- Fix to check num_workspace after wakeup.
Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com>
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- Fix a race that can result in alloc_workspace > cpus.
- Fix to check num_workspace after wakeup.
Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com>