ext4: don't hold spinlock while calling ext4_issue_discard()
We can't hold the block group spinlock because we ext4_issue_discard() calls wait and hence can get rescheduled. Google-Bug-Id: 3017678 Signed-off-by: Lukas Czerner <lczerner@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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