[JFFS2] Put list of nodes in common part of ic/x_ref/x_datum structure

We'll be using a proper list of nodes in the jffs2_xattr_datum and
jffs2_xattr_ref structures, because the existing code to overwrite
them is just broken. Put it in the common part at the front of the
structure which is shared with the jffs2_inode_cache, so that the
jffs2_link_node_ref() function can do the right thing.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>

1 files changed, 27 insertions, 17 deletions

diff --git a/fs/jffs2/nodelist.h b/fs/jffs2/nodelist.h
index ee5aedcffc12..1e1c39da6da4 100644
--- a/fs/jffs2/nodelist.h
+++ b/fs/jffs2/nodelist.h
@@ -77,9 +77,9 @@
 struct jffs2_raw_node_ref
 {
         struct jffs2_raw_node_ref *next_in_ino; /* Points to the next raw_node_ref
-                for this inode. If this is the last, it points to the inode_cache
-                for this inode instead. The inode_cache will have NULL in the first
-                word so you know when you've got there :) */
+                for this object. If this _is_ the last, it points to the inode_cache,
+                xattr_ref or xattr_datum instead. The common part of those structures
+                has NULL in the first word. See jffs2_raw_ref_to_ic() below */
         struct jffs2_raw_node_ref *next_phys;
         uint32_t flash_offset;
 #define TEST_TOTLEN
@@ -88,6 +88,18 @@ struct jffs2_raw_node_ref
 #endif
 };
 
+static inline struct jffs2_inode_cache *jffs2_raw_ref_to_ic(struct jffs2_raw_node_ref *raw)
+{
+        while(raw->next_in_ino) {
+                raw = raw->next_in_ino;
+        }
+
+        /* NB. This can be a jffs2_xattr_datum or jffs2_xattr_ref and
+           not actually a jffs2_inode_cache. Check ->class */
+        return ((struct jffs2_inode_cache *)raw);
+}
+
+
         /* flash_offset & 3 always has to be zero, because nodes are
            always aligned at 4 bytes. So we have a couple of extra bits
            to play with, which indicate the node's status; see below: */
@@ -113,20 +125,27 @@ struct jffs2_raw_node_ref
    a pointer to the first physical node which is part of this inode, too.
 */
 struct jffs2_inode_cache {
+        /* First part of structure is shared with other objects which
+           can terminate the raw node refs' next_in_ino list -- which
+           currently struct jffs2_xattr_datum and struct jffs2_xattr_ref. */
+
         struct jffs2_full_dirent *scan_dents; /* Used during scan to hold
                 temporary lists of dirents, and later must be set to
                 NULL to mark the end of the raw_node_ref->next_in_ino
                 chain. */
-        u8 class;       /* It's used for identification */
-        u8 flags;
-        uint16_t state;
-        struct jffs2_inode_cache *next;
         struct jffs2_raw_node_ref *nodes;
+        uint8_t class;  /* It's used for identification */
+
+        /* end of shared structure */
+
+        uint8_t flags;
+        uint16_t state;
         uint32_t ino;
-        int nlink;
+        struct jffs2_inode_cache *next;
 #ifdef CONFIG_JFFS2_FS_XATTR
         struct jffs2_xattr_ref *xref;
 #endif
+        int nlink;
 };
 
 /* Inode states for 'state' above. We need the 'GC' state to prevent
@@ -250,15 +269,6 @@ static inline int jffs2_encode_dev(union jffs2_device_node *jdev, dev_t rdev)
         }
 }
 
-static inline struct jffs2_inode_cache *jffs2_raw_ref_to_ic(struct jffs2_raw_node_ref *raw)
-{
-        while(raw->next_in_ino) {
-                raw = raw->next_in_ino;
-        }
-
-        return ((struct jffs2_inode_cache *)raw);
-}
-
 static inline struct jffs2_node_frag *frag_first(struct rb_root *root)
 {
         struct rb_node *node = root->rb_node;