| /* |
| File: fs/ext4/xattr.h |
| |
| On-disk format of extended attributes for the ext4 filesystem. |
| |
| (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org> |
| */ |
| |
| #include <linux/xattr.h> |
| |
| /* Magic value in attribute blocks */ |
| #define EXT4_XATTR_MAGIC 0xEA020000 |
| |
| /* Maximum number of references to one attribute block */ |
| #define EXT4_XATTR_REFCOUNT_MAX 1024 |
| |
| /* Name indexes */ |
| #define EXT4_XATTR_INDEX_USER 1 |
| #define EXT4_XATTR_INDEX_POSIX_ACL_ACCESS 2 |
| #define EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT 3 |
| #define EXT4_XATTR_INDEX_TRUSTED 4 |
| #define EXT4_XATTR_INDEX_LUSTRE 5 |
| #define EXT4_XATTR_INDEX_SECURITY 6 |
| #define EXT4_XATTR_INDEX_SYSTEM 7 |
| |
| struct ext4_xattr_header { |
| __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 */ |
| __le32 h_checksum; /* crc32c(uuid+id+xattrblock) */ |
| /* id = inum if refcount=1, blknum otherwise */ |
| __u32 h_reserved[3]; /* zero right now */ |
| }; |
| |
| struct ext4_xattr_ibody_header { |
| __le32 h_magic; /* magic number for identification */ |
| }; |
| |
| struct ext4_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 */ |
| }; |
| |
| #define EXT4_XATTR_PAD_BITS 2 |
| #define EXT4_XATTR_PAD (1<<EXT4_XATTR_PAD_BITS) |
| #define EXT4_XATTR_ROUND (EXT4_XATTR_PAD-1) |
| #define EXT4_XATTR_LEN(name_len) \ |
| (((name_len) + EXT4_XATTR_ROUND + \ |
| sizeof(struct ext4_xattr_entry)) & ~EXT4_XATTR_ROUND) |
| #define EXT4_XATTR_NEXT(entry) \ |
| ((struct ext4_xattr_entry *)( \ |
| (char *)(entry) + EXT4_XATTR_LEN((entry)->e_name_len))) |
| #define EXT4_XATTR_SIZE(size) \ |
| (((size) + EXT4_XATTR_ROUND) & ~EXT4_XATTR_ROUND) |
| |
| #define IHDR(inode, raw_inode) \ |
| ((struct ext4_xattr_ibody_header *) \ |
| ((void *)raw_inode + \ |
| EXT4_GOOD_OLD_INODE_SIZE + \ |
| EXT4_I(inode)->i_extra_isize)) |
| #define IFIRST(hdr) ((struct ext4_xattr_entry *)((hdr)+1)) |
| |
| #define BHDR(bh) ((struct ext4_xattr_header *)((bh)->b_data)) |
| #define ENTRY(ptr) ((struct ext4_xattr_entry *)(ptr)) |
| #define BFIRST(bh) ENTRY(BHDR(bh)+1) |
| #define IS_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0) |
| |
| |
| struct ext4_xattr_info { |
| int name_index; |
| const char *name; |
| const void *value; |
| size_t value_len; |
| }; |
| |
| struct ext4_xattr_search { |
| struct ext4_xattr_entry *first; |
| void *base; |
| void *end; |
| struct ext4_xattr_entry *here; |
| int not_found; |
| }; |
| |
| struct ext4_xattr_ibody_find { |
| struct ext4_xattr_search s; |
| struct ext4_iloc iloc; |
| }; |
| |
| # ifdef CONFIG_EXT4_FS_XATTR |
| |
| extern const struct xattr_handler ext4_xattr_user_handler; |
| extern const struct xattr_handler ext4_xattr_trusted_handler; |
| extern const struct xattr_handler ext4_xattr_acl_access_handler; |
| extern const struct xattr_handler ext4_xattr_acl_default_handler; |
| extern const struct xattr_handler ext4_xattr_security_handler; |
| |
| extern ssize_t ext4_listxattr(struct dentry *, char *, size_t); |
| |
| extern int ext4_xattr_get(struct inode *, int, const char *, void *, size_t); |
| extern int ext4_xattr_set(struct inode *, int, const char *, const void *, size_t, int); |
| extern int ext4_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int); |
| |
| extern void ext4_xattr_delete_inode(handle_t *, struct inode *); |
| extern void ext4_xattr_put_super(struct super_block *); |
| |
| extern int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, |
| struct ext4_inode *raw_inode, handle_t *handle); |
| |
| extern int __init ext4_init_xattr(void); |
| extern void ext4_exit_xattr(void); |
| |
| extern const struct xattr_handler *ext4_xattr_handlers[]; |
| |
| extern int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, |
| struct ext4_xattr_ibody_find *is); |
| extern int ext4_xattr_ibody_get(struct inode *inode, int name_index, |
| const char *name, |
| void *buffer, size_t buffer_size); |
| extern int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, |
| struct ext4_xattr_info *i, |
| struct ext4_xattr_ibody_find *is); |
| |
| extern int ext4_has_inline_data(struct inode *inode); |
| extern int ext4_get_inline_size(struct inode *inode); |
| extern int ext4_get_max_inline_size(struct inode *inode); |
| extern int ext4_find_inline_data_nolock(struct inode *inode); |
| extern void ext4_write_inline_data(struct inode *inode, |
| struct ext4_iloc *iloc, |
| void *buffer, loff_t pos, |
| unsigned int len); |
| extern int ext4_prepare_inline_data(handle_t *handle, struct inode *inode, |
| unsigned int len); |
| extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, |
| unsigned int len); |
| extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); |
| |
| extern int ext4_readpage_inline(struct inode *inode, struct page *page); |
| extern int ext4_try_to_write_inline_data(struct address_space *mapping, |
| struct inode *inode, |
| loff_t pos, unsigned len, |
| unsigned flags, |
| struct page **pagep); |
| extern int ext4_write_inline_data_end(struct inode *inode, |
| loff_t pos, unsigned len, |
| unsigned copied, |
| struct page *page); |
| extern struct buffer_head * |
| ext4_journalled_write_inline_data(struct inode *inode, |
| unsigned len, |
| struct page *page); |
| extern int ext4_da_write_inline_data_begin(struct address_space *mapping, |
| struct inode *inode, |
| loff_t pos, unsigned len, |
| unsigned flags, |
| struct page **pagep, |
| void **fsdata); |
| extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, |
| unsigned len, unsigned copied, |
| struct page *page); |
| extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry, |
| struct inode *inode); |
| extern int ext4_try_create_inline_dir(handle_t *handle, |
| struct inode *parent, |
| struct inode *inode); |
| extern int ext4_read_inline_dir(struct file *filp, |
| void *dirent, filldir_t filldir, |
| int *has_inline_data); |
| extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, |
| const struct qstr *d_name, |
| struct ext4_dir_entry_2 **res_dir, |
| int *has_inline_data); |
| # else /* CONFIG_EXT4_FS_XATTR */ |
| |
| static inline int |
| ext4_xattr_get(struct inode *inode, int name_index, const char *name, |
| void *buffer, size_t size, int flags) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| static inline int |
| ext4_xattr_set(struct inode *inode, int name_index, const char *name, |
| const void *value, size_t size, int flags) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| static inline int |
| ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, |
| const char *name, const void *value, size_t size, int flags) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| static inline void |
| ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) |
| { |
| } |
| |
| static inline void |
| ext4_xattr_put_super(struct super_block *sb) |
| { |
| } |
| |
| static __init inline int |
| ext4_init_xattr(void) |
| { |
| return 0; |
| } |
| |
| static inline void |
| ext4_exit_xattr(void) |
| { |
| } |
| |
| static inline int |
| ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, |
| struct ext4_inode *raw_inode, handle_t *handle) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| #define ext4_xattr_handlers NULL |
| |
| static inline int |
| ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, |
| struct ext4_xattr_ibody_find *is) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| static inline int |
| ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, |
| struct ext4_xattr_info *i, |
| struct ext4_xattr_ibody_find *is) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| static inline int |
| ext4_xattr_ibody_get(struct inode *inode, int name_index, |
| const char *name, |
| void *buffer, size_t buffer_size) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| static inline int ext4_find_inline_data_nolock(struct inode *inode) |
| { |
| return 0; |
| } |
| |
| static inline int ext4_has_inline_data(struct inode *inode) |
| { |
| return 0; |
| } |
| |
| static inline int ext4_get_inline_size(struct inode *inode) |
| { |
| return 0; |
| } |
| |
| static inline int ext4_get_max_inline_size(struct inode *inode) |
| { |
| return 0; |
| } |
| |
| static inline void ext4_write_inline_data(struct inode *inode, |
| struct ext4_iloc *iloc, |
| void *buffer, loff_t pos, |
| unsigned int len) |
| { |
| return; |
| } |
| |
| static inline int ext4_init_inline_data(handle_t *handle, |
| struct inode *inode, |
| unsigned int len) |
| { |
| return 0; |
| } |
| |
| static inline int ext4_destroy_inline_data(handle_t *handle, |
| struct inode *inode) |
| { |
| return 0; |
| } |
| |
| static inline int ext4_readpage_inline(struct inode *inode, struct page *page) |
| { |
| return 0; |
| } |
| |
| static inline int ext4_try_to_write_inline_data(struct address_space *mapping, |
| struct inode *inode, |
| loff_t pos, unsigned len, |
| unsigned flags, |
| struct page **pagep) |
| { |
| return 0; |
| } |
| |
| static inline int ext4_write_inline_data_end(struct inode *inode, |
| loff_t pos, unsigned len, |
| unsigned copied, |
| struct page *page) |
| { |
| return 0; |
| } |
| |
| static inline struct buffer_head * |
| ext4_journalled_write_inline_data(struct inode *inode, |
| unsigned len, |
| struct page *page) |
| { |
| return NULL; |
| } |
| |
| static inline int |
| ext4_da_write_inline_data_begin(struct address_space *mapping, |
| struct inode *inode, |
| loff_t pos, unsigned len, |
| unsigned flags, |
| struct page **pagep, |
| void **fsdata) |
| { |
| return 0; |
| } |
| |
| static inline int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, |
| unsigned len, unsigned copied, |
| struct page *page) |
| { |
| return 0; |
| } |
| |
| static inline int ext4_try_add_inline_entry(handle_t *handle, |
| struct dentry *dentry, |
| struct inode *inode) |
| { |
| return 0; |
| } |
| |
| static inline int ext4_try_create_inline_dir(handle_t *handle, |
| struct inode *parent, |
| struct inode *inode) |
| { |
| return 0; |
| } |
| static inline int ext4_read_inline_dir(struct file *filp, |
| void *dirent, filldir_t filldir, |
| int *has_inline_data) |
| { |
| return 0; |
| } |
| |
| static inline struct buffer_head * |
| ext4_find_inline_entry(struct inode *dir, |
| const struct qstr *d_name, |
| struct ext4_dir_entry_2 **res_dir, |
| int *has_inline_data) |
| { |
| return NULL; |
| } |
| # endif /* CONFIG_EXT4_FS_XATTR */ |
| |
| #ifdef CONFIG_EXT4_FS_SECURITY |
| extern int ext4_init_security(handle_t *handle, struct inode *inode, |
| struct inode *dir, const struct qstr *qstr); |
| #else |
| static inline int ext4_init_security(handle_t *handle, struct inode *inode, |
| struct inode *dir, const struct qstr *qstr) |
| { |
| return 0; |
| } |
| #endif |