[PATCH 09/10] GFS2: Get a block reservation before resizing a file

From: Steven Whitehouse
Date: Tue Feb 19 2013 - 05:34:57 EST

From: Bob Peterson <rpeterso@xxxxxxxxxx>

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>

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)


+ 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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