[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, 37 insertions, 3 deletions

diff --git a/fs/jffs2/xattr.h b/fs/jffs2/xattr.h
index 2c199856c582..06ab7b880212 100644
--- a/fs/jffs2/xattr.h
+++ b/fs/jffs2/xattr.h
@@ -16,6 +16,7 @@
 
 #define JFFS2_XFLAGS_HOT        (0x01)  /* This datum is HOT */
 #define JFFS2_XFLAGS_BIND       (0x02)  /* This datum is not reclaimed */
+#define JFFS2_XFLAGS_INVALID    (0x80)  /* This datum contains crc error */
 
 struct jffs2_xattr_datum
 {
@@ -23,7 +24,7 @@ struct jffs2_xattr_datum
         struct jffs2_raw_node_ref *node;
         uint8_t class;
         uint8_t flags;
-        uint16_t xprefix;                       /* see JFFS2_XATTR_PREFIX_* */
+        uint16_t xprefix;               /* see JFFS2_XATTR_PREFIX_* */
 
         struct list_head xindex;        /* chained from c->xattrindex[n] */
         uint32_t refcnt;                /* # of xattr_ref refers this */
@@ -47,6 +48,7 @@ struct jffs2_xattr_ref
         uint8_t flags;          /* Currently unused */
         u16 unused;
 
+        uint32_t xseqno;
         union {
                 struct jffs2_inode_cache *ic;   /* reference to jffs2_inode_cache */
                 uint32_t ino;                   /* only used in scanning/building  */
@@ -58,6 +60,34 @@ struct jffs2_xattr_ref
         struct jffs2_xattr_ref *next;           /* chained from ic->xref_list */
 };
 
+#define XDATUM_DELETE_MARKER    (0xffffffff)
+#define XREF_DELETE_MARKER      (0x00000001)
+static inline int is_xattr_datum_dead(struct jffs2_xattr_datum *xd)
+{
+        return (xd->version == XDATUM_DELETE_MARKER);
+}
+
+static inline void set_xattr_datum_dead(struct jffs2_xattr_datum *xd)
+{
+        xd->version = XDATUM_DELETE_MARKER;
+}
+
+static inline int is_xattr_ref_dead(struct jffs2_xattr_ref *ref)
+{
+        return ((ref->xseqno & XREF_DELETE_MARKER) != 0);
+}
+
+static inline void set_xattr_ref_dead(struct jffs2_xattr_ref *ref)
+{
+        ref->xseqno |= XREF_DELETE_MARKER;
+}
+
+static inline void clr_xattr_ref_dead(struct jffs2_xattr_ref *ref)
+{
+        ref->xseqno &= ~XREF_DELETE_MARKER;
+}
+
+
 #ifdef CONFIG_JFFS2_FS_XATTR
 
 extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c);
@@ -70,9 +100,13 @@ extern struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c
 extern void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
 extern void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
 
-extern int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd);
-extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref);
+extern int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd,
+                                             struct jffs2_raw_node_ref *raw);
+extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref,
+                                           struct jffs2_raw_node_ref *raw);
 extern int jffs2_verify_xattr(struct jffs2_sb_info *c);
+extern void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd);
+extern void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref);
 
 extern int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
                              char *buffer, size_t size);