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xattr.h
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xattr.h
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#include <linux/init.h>
#include <linux/xattr.h>
/* Magic value in attribute blocks */
#define AEON_XATTR_MAGIC 0xEFF20
/* Maximum number of references to one attribute block */
#define AEON_XATTR_REFCOUNT_MAX 1024
/* Name indexes */
#define AEON_XATTR_INDEX_USER 1
#define AEON_XATTR_INDEX_POSIX_ACL_ACCESS 2
#define AEON_XATTR_INDEX_POSIX_ACL_DEFAULT 3
#define AEON_XATTR_INDEX_TRUSTED 4
#define AEON_XATTR_INDEX_LUSTRE 5
#define AEON_XATTR_INDEX_SECURITY 6
struct aeon_xattr_header {
rwlock_t x_lock;
__le32 h_magic; /* magic number for identification */
__le32 h_refcount; /* reference count */
__le32 h_blocks; /* number of disk blocks used */
__le32 h_hash; /* hash value of all attributes */
__u32 h_reserved[4]; /* zero right now */
};
struct aeon_xattr_entry {
__u8 e_name_len; /* length of name */
__u8 e_name_index; /* attribute name index */
__le16 e_value_offs; /* offset in disk block of value */
__le32 e_value_block; /* disk block attribute is stored on (n/i) */
__le32 e_value_size; /* size of attribute value */
__le32 e_hash; /* hash value of name and value */
char e_name[0]; /* attribute name */
};
struct mb_cache;
#ifdef CONFIG_AEON_FS_XATTR
extern const struct xattr_handler aeon_xattr_user_handler;
extern const struct xattr_handler aeon_xattr_trusted_handler;
extern const struct xattr_handler aeon_xattr_security_handler;
extern ssize_t aeon_listxattr(struct dentry *, char *, size_t);
extern int aeon_xattr_get(struct inode *, int, const char *, void *, size_t);
extern int aeon_xattr_set(struct inode *, int, const char *,
const void *, size_t, int);
extern void aeon_xattr_delete_inode(struct inode *);
extern struct mb_cache *aeon_xattr_create_cache(void);
extern void aeon_xattr_destroy_cache(struct mb_cache *cache);
extern const struct xattr_handler *aeon_xattr_handlers[];
#else
static inline int
aeon_xattr_get(struct inode *inode, int name_index,
const char *name, void *buffer, size_t size)
{
return -EOPNOTSUPP;
}
static inline int
aeon_xattr_set(struct inode *inode, int name_index, const char *name,
const void *value, size_t size, int flags)
{
return -EOPNOTSUPP;
}
static inline void
aeon_xattr_delete_inode(struct inode *inode)
{
}
static inline void aeon_xattr_destroy_cache(struct mb_cache *cache)
{
}
#define aeon_xattr_handlers NULL
#endif
#ifdef CONFIG_AEON_FS_SECURITY
extern int aeon_init_security(struct inode *inode, struct inode *dir,
const struct qstr *qstr);
#else
static inline int aeon_init_security(struct inode *inode, struct inode *dir,
const struct qstr *qstr)
{
return 0;
}
#endif