[Cluster-devel] [GFS2 PATCH] GFS2: Get a block reservation before resizing a file

[Bob Peterson <rpeterso@redhat.com>]

Hi,

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.

Regards,

Bob Peterson
Red Hat File Systems

Signed-off-by: Bob Peterson <rpeterso@redhat.com> 
---
 fs/gfs2/bmap.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index d29d779..df686d1 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -1288,6 +1288,10 @@ int gfs2_setattr_size(struct inode *inode, u64 newsize)
 
 	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);