linux-kernel - [PATCH] quota: fix reserved space management for ordinary fs

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Message-ID: <87wrztpgbh.fsf_-_@openvz.org>
Date:	Fri, 08 Jan 2010 03:53:54 +0300
From:	Dmitry Monakhov <dmonakhov@...nvz.org>
To:	Dmitry Monakhov <rjevskiy@...il.com>
Cc:	Greg KH <gregkh@...e.de>, Thomas Voegtle <tv@...96.de>,
	Jan Kara <jack@...e.cz>, "Theodore Ts'o" <tytso@....edu>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org, stable@...nel.org
Subject: [PATCH] quota: fix reserved space management for ordinary fs


In fact inode_get_rsv_space() function is special in comparison
with inode_{add,sub,claim}_rsv_space() functions, because
it may return correct result even for fs without reserved space
support(correct val == 0). Add trivial check for that case.
The patch fix regression(BUG at fs/quota/dquot.c:1350) introduced
in following commit: fd8fbfc1709822bd94247c5b2ab15a5f5041e103

Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
---
 fs/quota/dquot.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index dea86ab..d9f06cf 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -1377,6 +1377,8 @@ static void inode_sub_rsv_space(struct inode *inode, qsize_t number)
 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);
-- 
1.6.3.3



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