ceph: simplify ceph_buffer interface
We never allocate the ceph_buffer and buffer separtely, so use a single
constructor.
Disallow put on NULL buffer; make the caller check.
Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index 04769a3..37d6ce6 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -482,7 +482,8 @@
ci->i_xattrs.prealloc_blob->vec.iov_len =
dest - ci->i_xattrs.prealloc_blob->vec.iov_base;
- ceph_buffer_put(ci->i_xattrs.blob);
+ if (ci->i_xattrs.blob)
+ ceph_buffer_put(ci->i_xattrs.blob);
ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
ci->i_xattrs.prealloc_blob = NULL;
ci->i_xattrs.dirty = false;
@@ -745,11 +746,12 @@
spin_unlock(&inode->i_lock);
dout(" preaallocating new blob size=%d\n", required_blob_size);
- blob = ceph_buffer_new_alloc(required_blob_size, GFP_NOFS);
+ blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
if (!blob)
goto out;
spin_lock(&inode->i_lock);
- ceph_buffer_put(ci->i_xattrs.prealloc_blob);
+ if (ci->i_xattrs.prealloc_blob)
+ ceph_buffer_put(ci->i_xattrs.prealloc_blob);
ci->i_xattrs.prealloc_blob = blob;
goto retry;
}