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

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- 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>
This commit is contained in:
KaiGai Kohei
2006-06-11 10:35:15 +09:00
committed by David Woodhouse
parent 6d4f8224d4
commit c9f700f840
10 changed files with 586 additions and 341 deletions
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40
fs/jffs2/xattr.h
View File

@@ -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);