GFS2: Increase i_writecount during gfs2_setattr_size

This patch calls get_write_access in a few functions. This
merely increases inode->i_writecount for the duration of the function.
That will ensure that any file closes won't delete the inode's
multi-block reservation while the function is running.

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

1 files changed, 13 insertions, 4 deletions

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 1dc9a13ce6bb..93b5809c20bb 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -1286,17 +1286,26 @@ int gfs2_setattr_size(struct inode *inode, u64 newsize)
         if (ret)
                 return ret;
 
+        ret = get_write_access(inode);
+        if (ret)
+                return ret;
+
         inode_dio_wait(inode);
 
         ret = gfs2_rs_alloc(GFS2_I(inode));
         if (ret)
-                return ret;
+                goto out;
 
         oldsize = inode->i_size;
-        if (newsize >= oldsize)
-                return do_grow(inode, newsize);
+        if (newsize >= oldsize) {
+                ret = do_grow(inode, newsize);
+                goto out;
+        }
 
-        return do_shrink(inode, oldsize, newsize);
+        ret = do_shrink(inode, oldsize, newsize);
+out:
+        put_write_access(inode);
+        return ret;
 }
 
 int gfs2_truncatei_resume(struct gfs2_inode *ip)