linux-kernel - [6/9] quota: Fix dquot_transfer for filesystems different from ext4

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Date:	Thu, 14 Jan 2010 14:46:42 -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,
	Dmitry Monakhov <dmonakhov@...nvz.org>, Jan Kara <jack@...e.cz>
Subject: [6/9] quota: Fix dquot_transfer for filesystems different from ext4

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

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

From: Jan Kara <jack@...e.cz>

commit 05b5d898235401c489c68e1f3bc5706a29ad5713 upstream.

Commit fd8fbfc1 modified the way we find amount of reserved space
belonging to an inode. The amount of reserved space is checked
from dquot_transfer and thus inode_reserved_space gets called
even for filesystems that don't provide get_reserved_space callback
which results in a BUG.

Fix the problem by checking get_reserved_space callback and return 0 if
the filesystem does not provide it.

CC: Dmitry Monakhov <dmonakhov@...nvz.org>
Signed-off-by: Jan Kara <jack@...e.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/quota/dquot.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -1425,6 +1425,9 @@ static void inode_sub_rsv_space(struct i
 static qsize_t inode_get_rsv_space(struct inode *inode)
 {
 	qsize_t ret;
+
+	if (!inode->i_sb->dq_op->get_reserved_space)
+		return 0;
 	spin_lock(&inode->i_lock);
 	ret = *inode_reserved_space(inode);
 	spin_unlock(&inode->i_lock);


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