linux/fs/ext3/xattr.h
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   1/*
   2  File: fs/ext3/xattr.h
   3
   4  On-disk format of extended attributes for the ext3 filesystem.
   5
   6  (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
   7*/
   8
   9#include <linux/xattr.h>
  10
  11/* Magic value in attribute blocks */
  12#define EXT3_XATTR_MAGIC                0xEA020000
  13
  14/* Maximum number of references to one attribute block */
  15#define EXT3_XATTR_REFCOUNT_MAX         1024
  16
  17/* Name indexes */
  18#define EXT3_XATTR_INDEX_USER                   1
  19#define EXT3_XATTR_INDEX_POSIX_ACL_ACCESS       2
  20#define EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT      3
  21#define EXT3_XATTR_INDEX_TRUSTED                4
  22#define EXT3_XATTR_INDEX_LUSTRE                 5
  23#define EXT3_XATTR_INDEX_SECURITY               6
  24
  25struct ext3_xattr_header {
  26        __le32  h_magic;        /* magic number for identification */
  27        __le32  h_refcount;     /* reference count */
  28        __le32  h_blocks;       /* number of disk blocks used */
  29        __le32  h_hash;         /* hash value of all attributes */
  30        __u32   h_reserved[4];  /* zero right now */
  31};
  32
  33struct ext3_xattr_ibody_header {
  34        __le32  h_magic;        /* magic number for identification */
  35};
  36
  37struct ext3_xattr_entry {
  38        __u8    e_name_len;     /* length of name */
  39        __u8    e_name_index;   /* attribute name index */
  40        __le16  e_value_offs;   /* offset in disk block of value */
  41        __le32  e_value_block;  /* disk block attribute is stored on (n/i) */
  42        __le32  e_value_size;   /* size of attribute value */
  43        __le32  e_hash;         /* hash value of name and value */
  44        char    e_name[0];      /* attribute name */
  45};
  46
  47#define EXT3_XATTR_PAD_BITS             2
  48#define EXT3_XATTR_PAD          (1<<EXT3_XATTR_PAD_BITS)
  49#define EXT3_XATTR_ROUND                (EXT3_XATTR_PAD-1)
  50#define EXT3_XATTR_LEN(name_len) \
  51        (((name_len) + EXT3_XATTR_ROUND + \
  52        sizeof(struct ext3_xattr_entry)) & ~EXT3_XATTR_ROUND)
  53#define EXT3_XATTR_NEXT(entry) \
  54        ( (struct ext3_xattr_entry *)( \
  55          (char *)(entry) + EXT3_XATTR_LEN((entry)->e_name_len)) )
  56#define EXT3_XATTR_SIZE(size) \
  57        (((size) + EXT3_XATTR_ROUND) & ~EXT3_XATTR_ROUND)
  58
  59# ifdef CONFIG_EXT3_FS_XATTR
  60
  61extern const struct xattr_handler ext3_xattr_user_handler;
  62extern const struct xattr_handler ext3_xattr_trusted_handler;
  63extern const struct xattr_handler ext3_xattr_acl_access_handler;
  64extern const struct xattr_handler ext3_xattr_acl_default_handler;
  65extern const struct xattr_handler ext3_xattr_security_handler;
  66
  67extern ssize_t ext3_listxattr(struct dentry *, char *, size_t);
  68
  69extern int ext3_xattr_get(struct inode *, int, const char *, void *, size_t);
  70extern int ext3_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
  71extern int ext3_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int);
  72
  73extern void ext3_xattr_delete_inode(handle_t *, struct inode *);
  74extern void ext3_xattr_put_super(struct super_block *);
  75
  76extern int init_ext3_xattr(void);
  77extern void exit_ext3_xattr(void);
  78
  79extern const struct xattr_handler *ext3_xattr_handlers[];
  80
  81# else  /* CONFIG_EXT3_FS_XATTR */
  82
  83static inline int
  84ext3_xattr_get(struct inode *inode, int name_index, const char *name,
  85               void *buffer, size_t size, int flags)
  86{
  87        return -EOPNOTSUPP;
  88}
  89
  90static inline int
  91ext3_xattr_set(struct inode *inode, int name_index, const char *name,
  92               const void *value, size_t size, int flags)
  93{
  94        return -EOPNOTSUPP;
  95}
  96
  97static inline int
  98ext3_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index,
  99               const char *name, const void *value, size_t size, int flags)
 100{
 101        return -EOPNOTSUPP;
 102}
 103
 104static inline void
 105ext3_xattr_delete_inode(handle_t *handle, struct inode *inode)
 106{
 107}
 108
 109static inline void
 110ext3_xattr_put_super(struct super_block *sb)
 111{
 112}
 113
 114static inline int
 115init_ext3_xattr(void)
 116{
 117        return 0;
 118}
 119
 120static inline void
 121exit_ext3_xattr(void)
 122{
 123}
 124
 125#define ext3_xattr_handlers     NULL
 126
 127# endif  /* CONFIG_EXT3_FS_XATTR */
 128
 129#ifdef CONFIG_EXT3_FS_SECURITY
 130extern int ext3_init_security(handle_t *handle, struct inode *inode,
 131                              struct inode *dir, const struct qstr *qstr);
 132#else
 133static inline int ext3_init_security(handle_t *handle, struct inode *inode,
 134                                     struct inode *dir, const struct qstr *qstr)
 135{
 136        return 0;
 137}
 138#endif
 139
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