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
 25struct ext4_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	__le32	h_checksum;	/* crc32c(uuid+id+xattrblock) */
 31				/* id = inum if refcount=1, blknum otherwise */
 32	__u32	h_reserved[3];	/* zero right now */
 33};
 34
 35struct ext4_xattr_ibody_header {
 36	__le32	h_magic;	/* magic number for identification */
 37};
 38
 39struct ext4_xattr_entry {
 40	__u8	e_name_len;	/* length of name */
 41	__u8	e_name_index;	/* attribute name index */
 42	__le16	e_value_offs;	/* offset in disk block of value */
 43	__le32	e_value_block;	/* disk block attribute is stored on (n/i) */
 44	__le32	e_value_size;	/* size of attribute value */
 45	__le32	e_hash;		/* hash value of name and value */
 46	char	e_name[0];	/* attribute name */
 47};
 48
 49#define EXT4_XATTR_PAD_BITS		2
 50#define EXT4_XATTR_PAD		(1<<EXT4_XATTR_PAD_BITS)
 51#define EXT4_XATTR_ROUND		(EXT4_XATTR_PAD-1)
 52#define EXT4_XATTR_LEN(name_len) \
 53	(((name_len) + EXT4_XATTR_ROUND + \
 54	sizeof(struct ext4_xattr_entry)) & ~EXT4_XATTR_ROUND)
 55#define EXT4_XATTR_NEXT(entry) \
 56	((struct ext4_xattr_entry *)( \
 57	 (char *)(entry) + EXT4_XATTR_LEN((entry)->e_name_len)))
 58#define EXT4_XATTR_SIZE(size) \
 59	(((size) + EXT4_XATTR_ROUND) & ~EXT4_XATTR_ROUND)
 60
 61#define IHDR(inode, raw_inode) \
 62	((struct ext4_xattr_ibody_header *) \
 63		((void *)raw_inode + \
 64		EXT4_GOOD_OLD_INODE_SIZE + \
 65		EXT4_I(inode)->i_extra_isize))
 66#define IFIRST(hdr) ((struct ext4_xattr_entry *)((hdr)+1))
 67
 68# ifdef CONFIG_EXT4_FS_XATTR
 69
 70extern const struct xattr_handler ext4_xattr_user_handler;
 71extern const struct xattr_handler ext4_xattr_trusted_handler;
 72extern const struct xattr_handler ext4_xattr_acl_access_handler;
 73extern const struct xattr_handler ext4_xattr_acl_default_handler;
 74extern const struct xattr_handler ext4_xattr_security_handler;
 75
 76extern ssize_t ext4_listxattr(struct dentry *, char *, size_t);
 77
 78extern int ext4_xattr_get(struct inode *, int, const char *, void *, size_t);
 79extern int ext4_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
 80extern int ext4_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int);
 81
 82extern void ext4_xattr_delete_inode(handle_t *, struct inode *);
 83extern void ext4_xattr_put_super(struct super_block *);
 84
 85extern int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
 86			    struct ext4_inode *raw_inode, handle_t *handle);
 87
 88extern int __init ext4_init_xattr(void);
 89extern void ext4_exit_xattr(void);
 90
 91extern const struct xattr_handler *ext4_xattr_handlers[];
 92
 93# else  /* CONFIG_EXT4_FS_XATTR */
 94
 95static inline int
 96ext4_xattr_get(struct inode *inode, int name_index, const char *name,
 97	       void *buffer, size_t size, int flags)
 98{
 99	return -EOPNOTSUPP;
100}
101
102static inline int
103ext4_xattr_set(struct inode *inode, int name_index, const char *name,
104	       const void *value, size_t size, int flags)
105{
106	return -EOPNOTSUPP;
107}
108
109static inline int
110ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index,
111	       const char *name, const void *value, size_t size, int flags)
112{
113	return -EOPNOTSUPP;
114}
115
116static inline void
117ext4_xattr_delete_inode(handle_t *handle, struct inode *inode)
118{
119}
120
121static inline void
122ext4_xattr_put_super(struct super_block *sb)
123{
124}
125
126static __init inline int
127ext4_init_xattr(void)
128{
129	return 0;
130}
131
132static inline void
133ext4_exit_xattr(void)
134{
135}
136
137static inline int
138ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
139			    struct ext4_inode *raw_inode, handle_t *handle)
140{
141	return -EOPNOTSUPP;
142}
143
144#define ext4_xattr_handlers	NULL
145
146# endif  /* CONFIG_EXT4_FS_XATTR */
147
148#ifdef CONFIG_EXT4_FS_SECURITY
149extern int ext4_init_security(handle_t *handle, struct inode *inode,
150			      struct inode *dir, const struct qstr *qstr);
151#else
152static inline int ext4_init_security(handle_t *handle, struct inode *inode,
153				     struct inode *dir, const struct qstr *qstr)
154{
155	return 0;
156}
157#endif

  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
 25struct ext4_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 ext4_xattr_ibody_header {
 34	__le32	h_magic;	/* magic number for identification */
 35};
 36
 37struct ext4_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 EXT4_XATTR_PAD_BITS		2
 48#define EXT4_XATTR_PAD		(1<<EXT4_XATTR_PAD_BITS)
 49#define EXT4_XATTR_ROUND		(EXT4_XATTR_PAD-1)
 50#define EXT4_XATTR_LEN(name_len) \
 51	(((name_len) + EXT4_XATTR_ROUND + \
 52	sizeof(struct ext4_xattr_entry)) & ~EXT4_XATTR_ROUND)
 53#define EXT4_XATTR_NEXT(entry) \
 54	((struct ext4_xattr_entry *)( \
 55	 (char *)(entry) + EXT4_XATTR_LEN((entry)->e_name_len)))
 56#define EXT4_XATTR_SIZE(size) \
 57	(((size) + EXT4_XATTR_ROUND) & ~EXT4_XATTR_ROUND)
 58
 59#define IHDR(inode, raw_inode) \
 60	((struct ext4_xattr_ibody_header *) \
 61		((void *)raw_inode + \
 62		EXT4_GOOD_OLD_INODE_SIZE + \
 63		EXT4_I(inode)->i_extra_isize))
 64#define IFIRST(hdr) ((struct ext4_xattr_entry *)((hdr)+1))
 65
 66# ifdef CONFIG_EXT4_FS_XATTR
 67
 68extern const struct xattr_handler ext4_xattr_user_handler;
 69extern const struct xattr_handler ext4_xattr_trusted_handler;
 70extern const struct xattr_handler ext4_xattr_acl_access_handler;
 71extern const struct xattr_handler ext4_xattr_acl_default_handler;
 72extern const struct xattr_handler ext4_xattr_security_handler;
 73
 74extern ssize_t ext4_listxattr(struct dentry *, char *, size_t);
 75
 76extern int ext4_xattr_get(struct inode *, int, const char *, void *, size_t);
 77extern int ext4_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
 78extern int ext4_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int);
 79
 80extern void ext4_xattr_delete_inode(handle_t *, struct inode *);
 81extern void ext4_xattr_put_super(struct super_block *);
 82
 83extern int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
 84			    struct ext4_inode *raw_inode, handle_t *handle);
 85
 86extern int __init ext4_init_xattr(void);
 87extern void ext4_exit_xattr(void);
 88
 89extern const struct xattr_handler *ext4_xattr_handlers[];
 90
 91# else  /* CONFIG_EXT4_FS_XATTR */
 92
 93static inline int
 94ext4_xattr_get(struct inode *inode, int name_index, const char *name,
 95	       void *buffer, size_t size, int flags)
 96{
 97	return -EOPNOTSUPP;
 98}
 99
100static inline int
101ext4_xattr_set(struct inode *inode, int name_index, const char *name,
102	       const void *value, size_t size, int flags)
103{
104	return -EOPNOTSUPP;
105}
106
107static inline int
108ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index,
109	       const char *name, const void *value, size_t size, int flags)
110{
111	return -EOPNOTSUPP;
112}
113
114static inline void
115ext4_xattr_delete_inode(handle_t *handle, struct inode *inode)
116{
117}
118
119static inline void
120ext4_xattr_put_super(struct super_block *sb)
121{
122}
123
124static __init inline int
125ext4_init_xattr(void)
126{
127	return 0;
128}
129
130static inline void
131ext4_exit_xattr(void)
132{
133}
134
135static inline int
136ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
137			    struct ext4_inode *raw_inode, handle_t *handle)
138{
139	return -EOPNOTSUPP;
140}
141
142#define ext4_xattr_handlers	NULL
143
144# endif  /* CONFIG_EXT4_FS_XATTR */
145
146#ifdef CONFIG_EXT4_FS_SECURITY
147extern int ext4_init_security(handle_t *handle, struct inode *inode,
148			      struct inode *dir, const struct qstr *qstr);
149#else
150static inline int ext4_init_security(handle_t *handle, struct inode *inode,
151				     struct inode *dir, const struct qstr *qstr)
152{
153	return 0;
154}
155#endif