[JFFS2][XATTR] Re-define xd->refcnt as atomic_t
In jffs2_release_xattr_datum(), it refers xd->refcnt to ensure
whether releasing xd is allowed or not.
But we can't hold xattr_sem since this function is called under
spin_lock(&c->erase_completion_lock). Thus we have to refer it
without any locking.
This patch redefine xd->refcnt as atomic_t. It enables to refer
xd->refcnt without any locking.
Signed-off-by: KaiGai Kohei <kaigai@ak.jp.nec.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/fs/jffs2/xattr.h b/fs/jffs2/xattr.h
index 4a10abc..06a5c69 100644
--- a/fs/jffs2/xattr.h
+++ b/fs/jffs2/xattr.h
@@ -28,7 +28,7 @@
uint16_t xprefix; /* see JFFS2_XATTR_PREFIX_* */
struct list_head xindex; /* chained from c->xattrindex[n] */
- uint32_t refcnt; /* # of xattr_ref refers this */
+ atomic_t refcnt; /* # of xattr_ref refers this */
uint32_t xid;
uint32_t version;