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Linux/fs/ext4/xattr.h

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  1 /*
  2   File: fs/ext4/xattr.h
  3 
  4   On-disk format of extended attributes for the ext4 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 EXT4_XATTR_MAGIC                0xEA020000
 13 
 14 /* Maximum number of references to one attribute block */
 15 #define EXT4_XATTR_REFCOUNT_MAX         1024
 16 
 17 /* Name indexes */
 18 #define EXT4_XATTR_INDEX_USER                   1
 19 #define EXT4_XATTR_INDEX_POSIX_ACL_ACCESS       2
 20 #define EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT      3
 21 #define EXT4_XATTR_INDEX_TRUSTED                4
 22 #define EXT4_XATTR_INDEX_LUSTRE                 5
 23 #define EXT4_XATTR_INDEX_SECURITY               6
 24 #define EXT4_XATTR_INDEX_SYSTEM                 7
 25 #define EXT4_XATTR_INDEX_RICHACL                8
 26 #define EXT4_XATTR_INDEX_ENCRYPTION             9
 27 
 28 struct ext4_xattr_header {
 29         __le32  h_magic;        /* magic number for identification */
 30         __le32  h_refcount;     /* reference count */
 31         __le32  h_blocks;       /* number of disk blocks used */
 32         __le32  h_hash;         /* hash value of all attributes */
 33         __le32  h_checksum;     /* crc32c(uuid+id+xattrblock) */
 34                                 /* id = inum if refcount=1, blknum otherwise */
 35         __u32   h_reserved[3];  /* zero right now */
 36 };
 37 
 38 struct ext4_xattr_ibody_header {
 39         __le32  h_magic;        /* magic number for identification */
 40 };
 41 
 42 struct ext4_xattr_entry {
 43         __u8    e_name_len;     /* length of name */
 44         __u8    e_name_index;   /* attribute name index */
 45         __le16  e_value_offs;   /* offset in disk block of value */
 46         __le32  e_value_block;  /* disk block attribute is stored on (n/i) */
 47         __le32  e_value_size;   /* size of attribute value */
 48         __le32  e_hash;         /* hash value of name and value */
 49         char    e_name[0];      /* attribute name */
 50 };
 51 
 52 #define EXT4_XATTR_PAD_BITS             2
 53 #define EXT4_XATTR_PAD          (1<<EXT4_XATTR_PAD_BITS)
 54 #define EXT4_XATTR_ROUND                (EXT4_XATTR_PAD-1)
 55 #define EXT4_XATTR_LEN(name_len) \
 56         (((name_len) + EXT4_XATTR_ROUND + \
 57         sizeof(struct ext4_xattr_entry)) & ~EXT4_XATTR_ROUND)
 58 #define EXT4_XATTR_NEXT(entry) \
 59         ((struct ext4_xattr_entry *)( \
 60          (char *)(entry) + EXT4_XATTR_LEN((entry)->e_name_len)))
 61 #define EXT4_XATTR_SIZE(size) \
 62         (((size) + EXT4_XATTR_ROUND) & ~EXT4_XATTR_ROUND)
 63 
 64 #define IHDR(inode, raw_inode) \
 65         ((struct ext4_xattr_ibody_header *) \
 66                 ((void *)raw_inode + \
 67                 EXT4_GOOD_OLD_INODE_SIZE + \
 68                 EXT4_I(inode)->i_extra_isize))
 69 #define IFIRST(hdr) ((struct ext4_xattr_entry *)((hdr)+1))
 70 
 71 #define BHDR(bh) ((struct ext4_xattr_header *)((bh)->b_data))
 72 #define ENTRY(ptr) ((struct ext4_xattr_entry *)(ptr))
 73 #define BFIRST(bh) ENTRY(BHDR(bh)+1)
 74 #define IS_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0)
 75 
 76 #define EXT4_ZERO_XATTR_VALUE ((void *)-1)
 77 
 78 struct ext4_xattr_info {
 79         int name_index;
 80         const char *name;
 81         const void *value;
 82         size_t value_len;
 83 };
 84 
 85 struct ext4_xattr_search {
 86         struct ext4_xattr_entry *first;
 87         void *base;
 88         void *end;
 89         struct ext4_xattr_entry *here;
 90         int not_found;
 91 };
 92 
 93 struct ext4_xattr_ibody_find {
 94         struct ext4_xattr_search s;
 95         struct ext4_iloc iloc;
 96 };
 97 
 98 extern const struct xattr_handler ext4_xattr_user_handler;
 99 extern const struct xattr_handler ext4_xattr_trusted_handler;
100 extern const struct xattr_handler ext4_xattr_security_handler;
101 
102 #define EXT4_XATTR_NAME_ENCRYPTION_CONTEXT "c"
103 
104 extern ssize_t ext4_listxattr(struct dentry *, char *, size_t);
105 
106 extern int ext4_xattr_get(struct inode *, int, const char *, void *, size_t);
107 extern int ext4_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
108 extern int ext4_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int);
109 
110 extern void ext4_xattr_delete_inode(handle_t *, struct inode *);
111 
112 extern int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
113                             struct ext4_inode *raw_inode, handle_t *handle);
114 
115 extern const struct xattr_handler *ext4_xattr_handlers[];
116 
117 extern int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i,
118                                  struct ext4_xattr_ibody_find *is);
119 extern int ext4_xattr_ibody_get(struct inode *inode, int name_index,
120                                 const char *name,
121                                 void *buffer, size_t buffer_size);
122 extern int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode,
123                                        struct ext4_xattr_info *i,
124                                        struct ext4_xattr_ibody_find *is);
125 
126 extern struct mb_cache *ext4_xattr_create_cache(void);
127 extern void ext4_xattr_destroy_cache(struct mb_cache *);
128 
129 #ifdef CONFIG_EXT4_FS_SECURITY
130 extern int ext4_init_security(handle_t *handle, struct inode *inode,
131                               struct inode *dir, const struct qstr *qstr);
132 #else
133 static inline int ext4_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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