diff options
Diffstat (limited to 'fs/jffs2/xattr.h')
| -rw-r--r-- | fs/jffs2/xattr.h | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/fs/jffs2/xattr.h b/fs/jffs2/xattr.h new file mode 100644 index 000000000..720007b2f --- /dev/null +++ b/fs/jffs2/xattr.h @@ -0,0 +1,127 @@ +/* + * JFFS2 -- Journalling Flash File System, Version 2. + * + * Copyright © 2006 NEC Corporation + * + * Created by KaiGai Kohei <kaigai@ak.jp.nec.com> + * + * For licensing information, see the file 'LICENCE' in this directory. + * + */ + +#ifndef _JFFS2_FS_XATTR_H_ +#define _JFFS2_FS_XATTR_H_ + +#include <linux/xattr.h> +#include <linux/list.h> + +#define JFFS2_XFLAGS_HOT (0x01) /* This datum is HOT */ +#define JFFS2_XFLAGS_BIND (0x02) /* This datum is not reclaimed */ +#define JFFS2_XFLAGS_DEAD (0x40) /* This datum is already dead */ +#define JFFS2_XFLAGS_INVALID (0x80) /* This datum contains crc error */ + +struct jffs2_xattr_datum +{ + void *always_null; + struct jffs2_raw_node_ref *node; + uint8_t class; + uint8_t flags; + uint16_t xprefix; /* see JFFS2_XATTR_PREFIX_* */ + + struct list_head xindex; /* chained from c->xattrindex[n] */ + atomic_t refcnt; /* # of xattr_ref refers this */ + uint32_t xid; + uint32_t version; + + uint32_t data_crc; + uint32_t hashkey; + char *xname; /* XATTR name without prefix */ + uint32_t name_len; /* length of xname */ + char *xvalue; /* XATTR value */ + uint32_t value_len; /* length of xvalue */ +}; + +struct jffs2_inode_cache; +struct jffs2_xattr_ref +{ + void *always_null; + struct jffs2_raw_node_ref *node; + uint8_t class; + 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 */ + }; + union { + struct jffs2_xattr_datum *xd; /* reference to jffs2_xattr_datum */ + uint32_t xid; /* only used in sccanning/building */ + }; + struct jffs2_xattr_ref *next; /* chained from ic->xref_list */ +}; + +#define XREF_DELETE_MARKER (0x00000001) +static inline int is_xattr_ref_dead(struct jffs2_xattr_ref *ref) +{ + return ((ref->xseqno & XREF_DELETE_MARKER) != 0); +} + +#ifdef CONFIG_JFFS2_FS_XATTR + +extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c); +extern void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c); +extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c); + +extern struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c, + uint32_t xid, uint32_t version); + +extern void jffs2_xattr_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic); +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, + 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); +extern int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname, + const char *buffer, size_t size, int flags); + +extern const struct xattr_handler *jffs2_xattr_handlers[]; +extern const struct xattr_handler jffs2_user_xattr_handler; +extern const struct xattr_handler jffs2_trusted_xattr_handler; + +extern ssize_t jffs2_listxattr(struct dentry *, char *, size_t); + +#else + +#define jffs2_init_xattr_subsystem(c) +#define jffs2_build_xattr_subsystem(c) +#define jffs2_clear_xattr_subsystem(c) + +#define jffs2_xattr_do_crccheck_inode(c, ic) +#define jffs2_xattr_delete_inode(c, ic) +#define jffs2_xattr_free_inode(c, ic) +#define jffs2_verify_xattr(c) (1) + +#define jffs2_xattr_handlers NULL +#define jffs2_listxattr NULL + +#endif /* CONFIG_JFFS2_FS_XATTR */ + +#ifdef CONFIG_JFFS2_FS_SECURITY +extern int jffs2_init_security(struct inode *inode, struct inode *dir, + const struct qstr *qstr); +extern const struct xattr_handler jffs2_security_xattr_handler; +#else +#define jffs2_init_security(inode,dir,qstr) (0) +#endif /* CONFIG_JFFS2_FS_SECURITY */ + +#endif /* _JFFS2_FS_XATTR_H_ */ |