From: Theodore Ts'o <tytso@mit.edu>
Date: Tue, 18 Sep 2012 17:33:44 +0000 (-0400)
Subject: ext4: re-enable -o discard functionality in no-journal mode
X-Git-Tag: v3.7-rc1~91^2~38
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b5e2368baeddf401bf3da9e364fc1c96676279cd;p=pandora-kernel.git

ext4: re-enable -o discard functionality in no-journal mode

This is a revert of commit b56ff9d397ce, 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 53fdcf992d61 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: "Theodore Ts'o" <tytso@mit.edu>
Cc: Anatol Pomozov <anatol.pomozov@gmail.com>
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