Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | File: linux/ext2_xattr.h |
| 3 | |
| 4 | On-disk format of extended attributes for the ext2 filesystem. |
| 5 | |
| 6 | (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org> |
| 7 | */ |
| 8 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/init.h> |
| 10 | #include <linux/xattr.h> |
| 11 | |
| 12 | /* Magic value in attribute blocks */ |
| 13 | #define EXT2_XATTR_MAGIC 0xEA020000 |
| 14 | |
| 15 | /* Maximum number of references to one attribute block */ |
| 16 | #define EXT2_XATTR_REFCOUNT_MAX 1024 |
| 17 | |
| 18 | /* Name indexes */ |
| 19 | #define EXT2_XATTR_INDEX_USER 1 |
| 20 | #define EXT2_XATTR_INDEX_POSIX_ACL_ACCESS 2 |
| 21 | #define EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT 3 |
| 22 | #define EXT2_XATTR_INDEX_TRUSTED 4 |
| 23 | #define EXT2_XATTR_INDEX_LUSTRE 5 |
| 24 | #define EXT2_XATTR_INDEX_SECURITY 6 |
| 25 | |
| 26 | struct ext2_xattr_header { |
| 27 | __le32 h_magic; /* magic number for identification */ |
| 28 | __le32 h_refcount; /* reference count */ |
| 29 | __le32 h_blocks; /* number of disk blocks used */ |
| 30 | __le32 h_hash; /* hash value of all attributes */ |
| 31 | __u32 h_reserved[4]; /* zero right now */ |
| 32 | }; |
| 33 | |
| 34 | struct ext2_xattr_entry { |
| 35 | __u8 e_name_len; /* length of name */ |
| 36 | __u8 e_name_index; /* attribute name index */ |
| 37 | __le16 e_value_offs; /* offset in disk block of value */ |
| 38 | __le32 e_value_block; /* disk block attribute is stored on (n/i) */ |
| 39 | __le32 e_value_size; /* size of attribute value */ |
| 40 | __le32 e_hash; /* hash value of name and value */ |
| 41 | char e_name[0]; /* attribute name */ |
| 42 | }; |
| 43 | |
| 44 | #define EXT2_XATTR_PAD_BITS 2 |
| 45 | #define EXT2_XATTR_PAD (1<<EXT2_XATTR_PAD_BITS) |
| 46 | #define EXT2_XATTR_ROUND (EXT2_XATTR_PAD-1) |
| 47 | #define EXT2_XATTR_LEN(name_len) \ |
| 48 | (((name_len) + EXT2_XATTR_ROUND + \ |
| 49 | sizeof(struct ext2_xattr_entry)) & ~EXT2_XATTR_ROUND) |
| 50 | #define EXT2_XATTR_NEXT(entry) \ |
| 51 | ( (struct ext2_xattr_entry *)( \ |
| 52 | (char *)(entry) + EXT2_XATTR_LEN((entry)->e_name_len)) ) |
| 53 | #define EXT2_XATTR_SIZE(size) \ |
| 54 | (((size) + EXT2_XATTR_ROUND) & ~EXT2_XATTR_ROUND) |
| 55 | |
| 56 | # ifdef CONFIG_EXT2_FS_XATTR |
| 57 | |
Stephen Hemminger | 749c72e | 2010-05-13 17:53:16 -0700 | [diff] [blame] | 58 | extern const struct xattr_handler ext2_xattr_user_handler; |
| 59 | extern const struct xattr_handler ext2_xattr_trusted_handler; |
| 60 | extern const struct xattr_handler ext2_xattr_acl_access_handler; |
| 61 | extern const struct xattr_handler ext2_xattr_acl_default_handler; |
| 62 | extern const struct xattr_handler ext2_xattr_security_handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
| 64 | extern ssize_t ext2_listxattr(struct dentry *, char *, size_t); |
| 65 | |
| 66 | extern int ext2_xattr_get(struct inode *, int, const char *, void *, size_t); |
| 67 | extern int ext2_xattr_set(struct inode *, int, const char *, const void *, size_t, int); |
| 68 | |
| 69 | extern void ext2_xattr_delete_inode(struct inode *); |
| 70 | extern void ext2_xattr_put_super(struct super_block *); |
| 71 | |
| 72 | extern int init_ext2_xattr(void); |
| 73 | extern void exit_ext2_xattr(void); |
| 74 | |
Stephen Hemminger | 749c72e | 2010-05-13 17:53:16 -0700 | [diff] [blame] | 75 | extern const struct xattr_handler *ext2_xattr_handlers[]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
| 77 | # else /* CONFIG_EXT2_FS_XATTR */ |
| 78 | |
| 79 | static inline int |
| 80 | ext2_xattr_get(struct inode *inode, int name_index, |
| 81 | const char *name, void *buffer, size_t size) |
| 82 | { |
| 83 | return -EOPNOTSUPP; |
| 84 | } |
| 85 | |
| 86 | static inline int |
| 87 | ext2_xattr_set(struct inode *inode, int name_index, const char *name, |
| 88 | const void *value, size_t size, int flags) |
| 89 | { |
| 90 | return -EOPNOTSUPP; |
| 91 | } |
| 92 | |
| 93 | static inline void |
| 94 | ext2_xattr_delete_inode(struct inode *inode) |
| 95 | { |
| 96 | } |
| 97 | |
| 98 | static inline void |
| 99 | ext2_xattr_put_super(struct super_block *sb) |
| 100 | { |
| 101 | } |
| 102 | |
| 103 | static inline int |
| 104 | init_ext2_xattr(void) |
| 105 | { |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | static inline void |
| 110 | exit_ext2_xattr(void) |
| 111 | { |
| 112 | } |
| 113 | |
| 114 | #define ext2_xattr_handlers NULL |
| 115 | |
| 116 | # endif /* CONFIG_EXT2_FS_XATTR */ |
| 117 | |
Stephen Smalley | 10f47e6 | 2005-09-09 13:01:39 -0700 | [diff] [blame] | 118 | #ifdef CONFIG_EXT2_FS_SECURITY |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 119 | extern int ext2_init_security(struct inode *inode, struct inode *dir, |
| 120 | const struct qstr *qstr); |
Stephen Smalley | 10f47e6 | 2005-09-09 13:01:39 -0700 | [diff] [blame] | 121 | #else |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 122 | static inline int ext2_init_security(struct inode *inode, struct inode *dir, |
| 123 | const struct qstr *qstr) |
Stephen Smalley | 10f47e6 | 2005-09-09 13:01:39 -0700 | [diff] [blame] | 124 | { |
| 125 | return 0; |
| 126 | } |
| 127 | #endif |