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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@suse.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@openvz.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.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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