linux-kernel - [67/73] nilfs2: fix regression that i-flag is not set on changeless checkpoints

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Date:	Fri, 04 Mar 2011 16:56:12 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
Subject: [67/73] nilfs2: fix regression that i-flag is not set on changeless checkpoints

2.6.37-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>

commit 72746ac643928f6c3113b5aa783d8ea1b13949d2 upstream.

According to the report from Jiro SEKIBA titled "regression in
2.6.37?"  (Message-Id: <8739n8vs1f.wl%jir@...iba.com>), on 2.6.37 and
later kernels, lscp command no longer displays "i" flag on checkpoints
that snapshot operations or garbage collection created.

This is a regression of nilfs2 checkpointing function, and it's
critical since it broke behavior of a part of nilfs2 applications.
For instance, snapshot manager of TimeBrowse gets to create
meaningless snapshots continuously; snapshot creation triggers another
checkpoint, but applications cannot distinguish whether the new
checkpoint contains meaningful changes or not without the i-flag.

This patch fixes the regression and brings that application behavior
back to normal.

Reported-by: Jiro SEKIBA <jir@...cus.jp>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
Tested-by: Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
Tested-by: Jiro SEKIBA <jir@...cus.jp>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/nilfs2/segment.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -430,7 +430,8 @@ static void nilfs_segctor_begin_finfo(st
 	nilfs_segctor_map_segsum_entry(
 		sci, &sci->sc_binfo_ptr, sizeof(struct nilfs_finfo));

-	if (inode->i_sb && !test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags))
+	if (NILFS_I(inode)->i_root &&
+	    !test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags))
 		set_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags);
 	/* skip finfo */
 }

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