c9f700f840
- 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>
151 lines
4.6 KiB
C
151 lines
4.6 KiB
C
/*
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* JFFS2 -- Journalling Flash File System, Version 2.
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*
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* Copyright (C) 2006 NEC Corporation
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*
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* Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
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*
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* For licensing information, see the file 'LICENCE' in this directory.
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*
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*/
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#ifndef _JFFS2_FS_XATTR_H_
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#define _JFFS2_FS_XATTR_H_
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#include <linux/xattr.h>
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#include <linux/list.h>
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#define JFFS2_XFLAGS_HOT (0x01) /* This datum is HOT */
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#define JFFS2_XFLAGS_BIND (0x02) /* This datum is not reclaimed */
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#define JFFS2_XFLAGS_INVALID (0x80) /* This datum contains crc error */
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struct jffs2_xattr_datum
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{
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void *always_null;
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struct jffs2_raw_node_ref *node;
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uint8_t class;
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uint8_t flags;
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uint16_t xprefix; /* see JFFS2_XATTR_PREFIX_* */
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struct list_head xindex; /* chained from c->xattrindex[n] */
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uint32_t refcnt; /* # of xattr_ref refers this */
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uint32_t xid;
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uint32_t version;
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uint32_t data_crc;
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uint32_t hashkey;
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char *xname; /* XATTR name without prefix */
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uint32_t name_len; /* length of xname */
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char *xvalue; /* XATTR value */
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uint32_t value_len; /* length of xvalue */
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};
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struct jffs2_inode_cache;
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struct jffs2_xattr_ref
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{
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void *always_null;
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struct jffs2_raw_node_ref *node;
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uint8_t class;
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uint8_t flags; /* Currently unused */
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u16 unused;
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uint32_t xseqno;
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union {
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struct jffs2_inode_cache *ic; /* reference to jffs2_inode_cache */
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uint32_t ino; /* only used in scanning/building */
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};
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union {
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struct jffs2_xattr_datum *xd; /* reference to jffs2_xattr_datum */
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uint32_t xid; /* only used in sccanning/building */
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};
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struct jffs2_xattr_ref *next; /* chained from ic->xref_list */
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};
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#define XDATUM_DELETE_MARKER (0xffffffff)
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#define XREF_DELETE_MARKER (0x00000001)
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static inline int is_xattr_datum_dead(struct jffs2_xattr_datum *xd)
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{
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return (xd->version == XDATUM_DELETE_MARKER);
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}
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static inline void set_xattr_datum_dead(struct jffs2_xattr_datum *xd)
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{
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xd->version = XDATUM_DELETE_MARKER;
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}
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static inline int is_xattr_ref_dead(struct jffs2_xattr_ref *ref)
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{
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return ((ref->xseqno & XREF_DELETE_MARKER) != 0);
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}
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static inline void set_xattr_ref_dead(struct jffs2_xattr_ref *ref)
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{
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ref->xseqno |= XREF_DELETE_MARKER;
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}
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static inline void clr_xattr_ref_dead(struct jffs2_xattr_ref *ref)
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{
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ref->xseqno &= ~XREF_DELETE_MARKER;
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}
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#ifdef CONFIG_JFFS2_FS_XATTR
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extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c);
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extern void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c);
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extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c);
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extern struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
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uint32_t xid, uint32_t version);
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extern void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
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extern void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
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extern int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd,
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struct jffs2_raw_node_ref *raw);
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extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref,
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struct jffs2_raw_node_ref *raw);
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extern int jffs2_verify_xattr(struct jffs2_sb_info *c);
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extern void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd);
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extern void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref);
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extern int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
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char *buffer, size_t size);
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extern int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
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const char *buffer, size_t size, int flags);
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extern struct xattr_handler *jffs2_xattr_handlers[];
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extern struct xattr_handler jffs2_user_xattr_handler;
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extern struct xattr_handler jffs2_trusted_xattr_handler;
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extern ssize_t jffs2_listxattr(struct dentry *, char *, size_t);
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#define jffs2_getxattr generic_getxattr
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#define jffs2_setxattr generic_setxattr
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#define jffs2_removexattr generic_removexattr
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#else
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#define jffs2_init_xattr_subsystem(c)
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#define jffs2_build_xattr_subsystem(c)
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#define jffs2_clear_xattr_subsystem(c)
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#define jffs2_xattr_delete_inode(c, ic)
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#define jffs2_xattr_free_inode(c, ic)
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#define jffs2_verify_xattr(c) (1)
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#define jffs2_xattr_handlers NULL
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#define jffs2_listxattr NULL
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#define jffs2_getxattr NULL
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#define jffs2_setxattr NULL
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#define jffs2_removexattr NULL
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#endif /* CONFIG_JFFS2_FS_XATTR */
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#ifdef CONFIG_JFFS2_FS_SECURITY
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extern int jffs2_init_security(struct inode *inode, struct inode *dir);
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extern struct xattr_handler jffs2_security_xattr_handler;
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#else
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#define jffs2_init_security(inode,dir) (0)
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#endif /* CONFIG_JFFS2_FS_SECURITY */
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#endif /* _JFFS2_FS_XATTR_H_ */
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