ocfs2_dlmfs: Don't honor truncate. The size of a dlmfs file is LVB_LEN

We want folks using dlmfs to be able to use the LVB in places other than
just write(2)/read(2).  By ignoring truncate requests, we allow 'echo
"contents" > /dlm/space/lockname' to work.

Signed-off-by: Joel Becker <joel.becker@oracle.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/fs/ocfs2/dlmfs/dlmfs.c b/fs/ocfs2/dlmfs/dlmfs.c
index e21ce0e5fc42..13ac2bffb05d 100644
--- a/fs/ocfs2/dlmfs/dlmfs.c
+++ b/fs/ocfs2/dlmfs/dlmfs.c
@@ -220,6 +220,23 @@ static int dlmfs_file_release(struct inode *inode,
         return 0;
 }
 
+/*
+ * We do ->setattr() just to override size changes.  Our size is the size
+ * of the LVB and nothing else.
+ */
+static int dlmfs_file_setattr(struct dentry *dentry, struct iattr *attr)
+{
+        int error;
+        struct inode *inode = dentry->d_inode;
+
+        attr->ia_valid &= ~ATTR_SIZE;
+        error = inode_change_ok(inode, attr);
+        if (!error)
+                error = inode_setattr(inode, attr);
+
+        return error;
+}
+
 static unsigned int dlmfs_file_poll(struct file *file, poll_table *wait)
 {
         int event = 0;
@@ -634,6 +651,7 @@ static const struct super_operations dlmfs_ops = {
 
 static const struct inode_operations dlmfs_file_inode_operations = {
         .getattr        = simple_getattr,
+        .setattr        = dlmfs_file_setattr,
 };
 
 static int dlmfs_get_sb(struct file_system_type *fs_type,