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authorKaiGai Kohei <kaigai@ak.jp.nec.com>2006-06-11 05:35:15 +0400
committerDavid Woodhouse <dwmw2@infradead.org>2006-06-27 19:16:26 +0400
commitc9f700f840bd481b3e01fcad1ba8da01794a6726 (patch)
tree786f4a6a3f3a2d619ae4230a62f95361fcd3245a /fs/jffs2/xattr.h
parent6d4f8224d4ee065e0e3186cc554468d735e6015d (diff)
downloadlinux-c9f700f840bd481b3e01fcad1ba8da01794a6726.tar.xz
[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>
Diffstat (limited to 'fs/jffs2/xattr.h')
-rw-r--r--fs/jffs2/xattr.h40
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);