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Path: news.gmane.org!not-for-mail
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From: Eric Sandeen <sandeen@redhat.com>
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Newsgroups: gmane.comp.file-systems.ext4
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Subject: [PATCH] jbd2: clear BH_Delay & BH_Unwritten in journal_unmap_buffer
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Date: Tue, 07 Feb 2012 16:07:20 -0600
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To: ext4 development <linux-ext4@vger.kernel.org>
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Original-X-From: linux-ext4-owner@vger.kernel.org Wed Feb 08 00:07:52 2012
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Xref: news.gmane.org gmane.comp.file-systems.ext4:30623
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Archived-At: <http://permalink.gmane.org/gmane.comp.file-systems.ext4/30623>
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journal_unmap_buffer()'s zap_buffer: code clears a lot of buffer head
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state ala discard_buffer(), but does not touch _Delay or _Unwritten
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as discard_buffer() does.
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This can be problematic in some areas of the ext4 code which assume
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that if they have found a buffer marked unwritten or delay, then it's
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a live one. Perhaps those spots should check whether it is mapped
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as well, but if jbd2 is going to tear down a buffer, let's really
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tear it down completely.
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Without this I get some fsx failures on sub-page-block filesystems
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up until v3.2, at which point 4e96b2dbbf1d7e81f22047a50f862555a6cb87cb
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and 189e868fa8fdca702eb9db9d8afc46b5cb9144c9 make the failures go
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away, because buried within that large change is some more flag
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clearing. I still think it's worth doing in jbd2, since
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->invalidatepage leads here directly, and it's the right place
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to clear away these flags.
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Signed-off-by: Eric Sandeen <sandeen@redhat.com>
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Cc: stable@vger.kernel.org
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---
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diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
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index 35ae096..52653306 100644
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--- a/fs/jbd2/transaction.c
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+++ b/fs/jbd2/transaction.c
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@@ -1949,6 +1949,8 @@ zap_buffer_unlocked:
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clear_buffer_mapped(bh);
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clear_buffer_req(bh);
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clear_buffer_new(bh);
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+ clear_buffer_delay(bh);
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+ clear_buffer_unwritten(bh);
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bh->b_bdev = NULL;
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return may_free;
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}
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--
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