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116 lines
3.3 KiB
116 lines
3.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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File: linux/ext2_xattr.h |
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On-disk format of extended attributes for the ext2 filesystem. |
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(C) 2001 Andreas Gruenbacher, <[email protected]> |
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*/ |
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#include <linux/init.h> |
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#include <linux/xattr.h> |
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/* Magic value in attribute blocks */ |
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#define EXT2_XATTR_MAGIC 0xEA020000 |
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/* Maximum number of references to one attribute block */ |
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#define EXT2_XATTR_REFCOUNT_MAX 1024 |
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/* Name indexes */ |
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#define EXT2_XATTR_INDEX_USER 1 |
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#define EXT2_XATTR_INDEX_POSIX_ACL_ACCESS 2 |
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#define EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT 3 |
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#define EXT2_XATTR_INDEX_TRUSTED 4 |
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#define EXT2_XATTR_INDEX_LUSTRE 5 |
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#define EXT2_XATTR_INDEX_SECURITY 6 |
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struct ext2_xattr_header { |
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__le32 h_magic; /* magic number for identification */ |
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__le32 h_refcount; /* reference count */ |
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__le32 h_blocks; /* number of disk blocks used */ |
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__le32 h_hash; /* hash value of all attributes */ |
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__u32 h_reserved[4]; /* zero right now */ |
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}; |
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struct ext2_xattr_entry { |
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__u8 e_name_len; /* length of name */ |
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__u8 e_name_index; /* attribute name index */ |
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__le16 e_value_offs; /* offset in disk block of value */ |
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__le32 e_value_block; /* disk block attribute is stored on (n/i) */ |
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__le32 e_value_size; /* size of attribute value */ |
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__le32 e_hash; /* hash value of name and value */ |
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char e_name[]; /* attribute name */ |
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}; |
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#define EXT2_XATTR_PAD_BITS 2 |
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#define EXT2_XATTR_PAD (1<<EXT2_XATTR_PAD_BITS) |
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#define EXT2_XATTR_ROUND (EXT2_XATTR_PAD-1) |
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#define EXT2_XATTR_LEN(name_len) \ |
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(((name_len) + EXT2_XATTR_ROUND + \ |
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sizeof(struct ext2_xattr_entry)) & ~EXT2_XATTR_ROUND) |
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#define EXT2_XATTR_NEXT(entry) \ |
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( (struct ext2_xattr_entry *)( \ |
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(char *)(entry) + EXT2_XATTR_LEN((entry)->e_name_len)) ) |
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#define EXT2_XATTR_SIZE(size) \ |
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(((size) + EXT2_XATTR_ROUND) & ~EXT2_XATTR_ROUND) |
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struct mb_cache; |
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# ifdef CONFIG_EXT2_FS_XATTR |
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extern const struct xattr_handler ext2_xattr_user_handler; |
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extern const struct xattr_handler ext2_xattr_trusted_handler; |
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extern const struct xattr_handler ext2_xattr_security_handler; |
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extern ssize_t ext2_listxattr(struct dentry *, char *, size_t); |
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extern int ext2_xattr_get(struct inode *, int, const char *, void *, size_t); |
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extern int ext2_xattr_set(struct inode *, int, const char *, const void *, size_t, int); |
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extern void ext2_xattr_delete_inode(struct inode *); |
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extern struct mb_cache *ext2_xattr_create_cache(void); |
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extern void ext2_xattr_destroy_cache(struct mb_cache *cache); |
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extern const struct xattr_handler *ext2_xattr_handlers[]; |
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# else /* CONFIG_EXT2_FS_XATTR */ |
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static inline int |
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ext2_xattr_get(struct inode *inode, int name_index, |
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const char *name, void *buffer, size_t size) |
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{ |
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return -EOPNOTSUPP; |
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} |
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static inline int |
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ext2_xattr_set(struct inode *inode, int name_index, const char *name, |
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const void *value, size_t size, int flags) |
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{ |
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return -EOPNOTSUPP; |
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} |
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static inline void |
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ext2_xattr_delete_inode(struct inode *inode) |
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{ |
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} |
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static inline void ext2_xattr_destroy_cache(struct mb_cache *cache) |
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{ |
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} |
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#define ext2_xattr_handlers NULL |
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#define ext2_listxattr NULL |
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# endif /* CONFIG_EXT2_FS_XATTR */ |
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#ifdef CONFIG_EXT2_FS_SECURITY |
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extern int ext2_init_security(struct inode *inode, struct inode *dir, |
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const struct qstr *qstr); |
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#else |
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static inline int ext2_init_security(struct inode *inode, struct inode *dir, |
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const struct qstr *qstr) |
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{ |
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return 0; |
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} |
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#endif
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