[JFFS2][XATTR] using 'delete marker' for xdatum/xref deletion

- When xdatum is removed, a new xdatum with 'delete marker' is
  written. (version==0xffffffff means 'delete marker')
- When xref is removed, a new xref with 'delete marker' is written.
  (odd-numbered xseqno means 'delete marker')

- delete_xattr_(datum/xref)_delay() are new deletion functions
  are added. We can only use them if we can detect the target
  obsolete xdatum/xref as a orphan or errir one.
  (e.g when inode deletion, or detecting crc error)

[1/3] jffs2-xattr-v6-01-delete_marker.patch

Signed-off-by: KaiGai Kohei <kaigai@ak.jp.nec.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

1 files changed, 15 insertions, 4 deletions

diff --git a/fs/jffs2/erase.c b/fs/jffs2/erase.c
index 1862e8bc101..1644e340885 100644
--- a/fs/jffs2/erase.c
+++ b/fs/jffs2/erase.c
@@ -230,7 +230,6 @@ static inline void jffs2_remove_node_refs_from_ino_list(struct jffs2_sb_info *c,
                            at the end of the linked list. Stash it and continue
                            from the beginning of the list */
                         ic = (struct jffs2_inode_cache *)(*prev);
-                        BUG_ON(ic->class != RAWNODE_CLASS_INODE_CACHE);
                         prev = &ic->nodes;
                         continue;
                 }
@@ -254,7 +253,8 @@ static inline void jffs2_remove_node_refs_from_ino_list(struct jffs2_sb_info *c,
 
         /* PARANOIA */
         if (!ic) {
-                printk(KERN_WARNING "inode_cache not found in remove_node_refs()!!\n");
+                JFFS2_WARNING("inode_cache/xattr_datum/xattr_ref"
+                              " not found in remove_node_refs()!!\n");
                 return;
         }
 
@@ -279,8 +279,19 @@ static inline void jffs2_remove_node_refs_from_ino_list(struct jffs2_sb_info *c,
                 printk("\n");
         });
 
-        if (ic->nodes == (void *)ic && ic->nlink == 0)
-                jffs2_del_ino_cache(c, ic);
+        switch (ic->class) {
+#ifdef CONFIG_JFFS2_FS_XATTR
+                case RAWNODE_CLASS_XATTR_DATUM:
+                        jffs2_release_xattr_datum(c, (struct jffs2_xattr_datum *)ic);
+                        break;
+                case RAWNODE_CLASS_XATTR_REF:
+                        jffs2_release_xattr_ref(c, (struct jffs2_xattr_ref *)ic);
+                        break;
+#endif
+                default:
+                        if (ic->nodes == (void *)ic && ic->nlink == 0)
+                                jffs2_del_ino_cache(c, ic);
+        }
 }
 
 void jffs2_free_jeb_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)