ext4: optimize ext4_should_retry_alloc() to improve ENOSPC performance
If there are no pending blocks to be released after a commit, forcing a journal commit has no hope of helping. It's possible that a commit had just completed, so if there are now free blocks available for allocation, it's worth retrying the commit. Reported-by: NChao Yu <yuchao0@huawei.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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