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Date: Wed, 28 Dec 2011 13:56:43 -0500 From: Ted Ts'o <tytso@....edu> To: Yongqiang Yang <xiaoqiangnk@...il.com> Cc: linux-ext4@...r.kernel.org Subject: Re: [PATCH 4/5] ext4: flush journal when switching from journal data mode On Tue, Nov 15, 2011 at 04:07:53PM +0800, Yongqiang Yang wrote: > When switching from journal data mode, the data blocks > in journal will have no revoke record. Thus, data could be > corrupted during replay. However, there is no such problem in > switching to journal data mode. So we flush journal only in > the case that swithes from journal data mode. > > Signed-off-by: Yongqiang Yang <xiaoqiangnk@...il.com> Applied, with a slightly different (and more explanatory commit message): ext4: flush journal when switching from data=journal mode From: Yongqiang Yang <xiaoqiangnk@...il.com> It's necessary to flush the journal when switching away from data=journal mode. This is because there are no revoke records when we are data blocks are journalled, which are required in the other journal modes. However, it is not necessary to flush the journal when switching into data=journal mode, and flushing the journal is expensive. So let's avoid it in that case. Signed-off-by: Yongqiang Yang <xiaoqiangnk@...il.com> Signed-off-by: "Theodore Ts'o" <tytso@....edu> - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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