ext2_ext_attr.h revision 347e52de90c736e113fc4e4aff5190e10d327606
15c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)/* 25c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) File: linux/ext2_ext_attr.h 35c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 45c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) On-disk format of extended attributes for the ext2 filesystem. 55c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 65c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) (C) 2000 Andreas Gruenbacher, <a.gruenbacher@computer.org> 75c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)*/ 85c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 95c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#ifndef _EXT2_EXT_ATTR_H 105c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#define _EXT2_EXT_ATTR_H 115c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)/* Magic value in attribute blocks */ 125c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#define EXT2_EXT_ATTR_MAGIC_v1 0xEA010000 135c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#define EXT2_EXT_ATTR_MAGIC 0xEA020000 145c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 155c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)/* Maximum number of references to one attribute block */ 165c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#define EXT2_EXT_ATTR_REFCOUNT_MAX 1024 175c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 185c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)struct ext2_ext_attr_header { 195c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) __u32 h_magic; /* magic number for identification */ 205c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) __u32 h_refcount; /* reference count */ 215c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) __u32 h_blocks; /* number of disk blocks used */ 225c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) __u32 h_hash; /* hash value of all attributes */ 235c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) __u32 h_reserved[4]; /* zero right now */ 245c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)}; 255c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 265c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)struct ext2_ext_attr_entry { 275c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) __u8 e_name_len; /* length of name */ 285c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) __u8 e_name_index; /* attribute name index */ 295c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) __u16 e_value_offs; /* offset in disk block of value */ 305c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) __u32 e_value_block; /* disk block attribute is stored on (n/i) */ 315c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) __u32 e_value_size; /* size of attribute value */ 325c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) __u32 e_hash; /* hash value of name and value */ 335c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#if 0 345c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) char e_name[0]; /* attribute name */ 351e202183a5dc46166763171984b285173f8585e5Torne (Richard Coles)#endif 367757ec2eadfa2dd8ac2aeed0a4399e9b07ec38cbBen Murdoch}; 377757ec2eadfa2dd8ac2aeed0a4399e9b07ec38cbBen Murdoch 385c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#define EXT2_EXT_ATTR_PAD_BITS 2 39c1847b1379d12d0e05df27436bf19a9b1bf12deaTorne (Richard Coles)#define EXT2_EXT_ATTR_PAD (1<<EXT2_EXT_ATTR_PAD_BITS) 405c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#define EXT2_EXT_ATTR_ROUND (EXT2_EXT_ATTR_PAD-1) 415c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#define EXT2_EXT_ATTR_LEN(name_len) \ 421e202183a5dc46166763171984b285173f8585e5Torne (Richard Coles) (((name_len) + EXT2_EXT_ATTR_ROUND + \ 435c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) sizeof(struct ext2_ext_attr_entry)) & ~EXT2_EXT_ATTR_ROUND) 445c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#define EXT2_EXT_ATTR_NEXT(entry) \ 451e202183a5dc46166763171984b285173f8585e5Torne (Richard Coles) ( (struct ext2_ext_attr_entry *)( \ 465c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) (char *)(entry) + EXT2_EXT_ATTR_LEN((entry)->e_name_len)) ) 475c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#define EXT2_EXT_ATTR_SIZE(size) \ 481e202183a5dc46166763171984b285173f8585e5Torne (Richard Coles) (((size) + EXT2_EXT_ATTR_ROUND) & ~EXT2_EXT_ATTR_ROUND) 495c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#define EXT2_EXT_IS_LAST_ENTRY(entry) (*((__u32 *)(entry)) == 0UL) 505c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#define EXT2_EXT_ATTR_NAME(entry) \ 515c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) (((char *) (entry)) + sizeof(struct ext2_ext_attr_entry)) 521e202183a5dc46166763171984b285173f8585e5Torne (Richard Coles)#define EXT2_XATTR_LEN(name_len) \ 535c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) (((name_len) + EXT2_EXT_ATTR_ROUND + \ 54c1847b1379d12d0e05df27436bf19a9b1bf12deaTorne (Richard Coles) sizeof(struct ext2_xattr_entry)) & ~EXT2_EXT_ATTR_ROUND) 555c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#define EXT2_XATTR_SIZE(size) \ 565c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) (((size) + EXT2_EXT_ATTR_ROUND) & ~EXT2_EXT_ATTR_ROUND) 57 58#ifdef __KERNEL__ 59# ifdef CONFIG_EXT2_FS_EXT_ATTR 60extern int ext2_get_ext_attr(struct inode *, const char *, char *, size_t, int); 61extern int ext2_set_ext_attr(struct inode *, const char *, char *, size_t, int); 62extern void ext2_ext_attr_free_inode(struct inode *inode); 63extern void ext2_ext_attr_put_super(struct super_block *sb); 64extern int ext2_ext_attr_init(void); 65extern void ext2_ext_attr_done(void); 66# else 67# define ext2_get_ext_attr NULL 68# define ext2_set_ext_attr NULL 69# endif 70#endif /* __KERNEL__ */ 71#endif /* _EXT2_EXT_ATTR_H */ 72