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由 Theodore Ts'o 提交于
This is a revert of commit b56ff9d3, which removed the call to ext4_issue_discard() to fix a BUG reported because ext4_issue_discard() was being called from inside a block group spinlock. As it turns out this bug had already been fixed by Lukas Czerner in commit 53fdcf99 by the simple expedient of moving when we call ext4_issue_discard() outside the spinlock. So it should be safe to re-enable this functionality, which I tested by putting an BUG_ON(in_atomic) just after the restored callsite to ext4_issue_discard(). Addresses-Google-Bug: #6750518 Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu> Cc: Anatol Pomozov <anatol.pomozov@gmail.com>
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