[ 51/58] GFS2: Get a block reservation before resizing a file

[Greg Kroah-Hartman]

3.7-stable review patch.  If anyone has any objections, please let me know.

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

From: Bob Peterson <rpeterso@xxxxxxxxxx>

commit d2b47cfb26fe06002b8011707baac71a9ae8166f upstream.

This patch allocates a block reservation structure before growing
or shrinking a file. Without this structure, the grow or shink code
can reference the bad pointer.

Signed-off-by: Bob Peterson <rpeterso@xxxxxxxxxx>
Signed-off-by: Steven Whitehouse <swhiteho@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 fs/gfs2/bmap.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -1240,6 +1240,10 @@ int gfs2_setattr_size(struct inode *inod
 
 	inode_dio_wait(inode);
 
+	ret = gfs2_rs_alloc(GFS2_I(inode));
+	if (ret)
+		return ret;
+
 	oldsize = inode->i_size;
 	if (newsize >= oldsize)
 		return do_grow(inode, newsize);


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