[PATCH] [GFS2] inode size inconsistency

From: swhiteho
Date: Mon Jul 09 2007 - 12:40:25 EST


From: Wendy Cheng <wcheng@xxxxxxxxxx>

This should have been part of the NFS patch #1 but somehow I missed it
when packaging the patches. It is not a critical issue as the others (I
hope). RHEL 5.1 31.el5 kernel runs fine without this change.

Our truncate code is chopped into two parts, one for vfs inode changes
(in vmtruncate()) and one of gfs inode (in gfs2_truncatei()). These two
operatons are, unfortunately, not atomic. So it could happens that
vmtruncate() succeeds (inode->i_size is changed) but gfs2_truncatei
fails (say kernel temporarily out of memory). This would leave gfs inode
i_di.di_size out of sync with vfs inode i_size. It will later confuse
gfs2_commit_write() if a write is issued. Last time I checked, it will
cause file corruption.

Signed-off-by: S. Wendy Cheng <wcheng@xxxxxxxxxx>
Signed-off-by: Steven Whitehouse <swhiteho@xxxxxxxxxx>

diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
index 84051b9..911c115 100644
--- a/fs/gfs2/ops_inode.c
+++ b/fs/gfs2/ops_inode.c
@@ -903,8 +903,8 @@ static int setattr_size(struct inode *inode, struct iattr *attr)
}

error = gfs2_truncatei(ip, attr->ia_size);
- if (error)
- return error;
+ if (error && (inode->i_size != ip->i_di.di_size))
+ i_size_write(inode, ip->i_di.di_size);

return error;
}
--
1.5.1.2

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/