From c9f700f840bd481b3e01fcad1ba8da01794a6726 Mon Sep 17 00:00:00 2001 From: KaiGai Kohei Date: Sun, 11 Jun 2006 10:35:15 +0900 Subject: [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 Signed-off-by: David Woodhouse --- fs/jffs2/xattr.h | 40 +++++++++++++++++++++++++++++++++++++--- 1 file changed, 37 insertions(+), 3 deletions(-) (limited to 'fs/jffs2/xattr.h') diff --git a/fs/jffs2/xattr.h b/fs/jffs2/xattr.h index 2c19985..06ab7b8 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); -- cgit v1.1