Commit 090ffaa5 authored Jun 27, 2007 by Wendy Cheng Committed by Steven Whitehouse Jul 09, 2007

[GFS2] inode size inconsistency



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@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

parent 97d84836

fs/gfs2/ops_inode.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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;
		}

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