887e2c4522
Signed-off-by: Michael Halcrow <mhalcrow@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
139 lines
4.5 KiB
C
139 lines
4.5 KiB
C
/*
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File: fs/ext4/xattr.h
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On-disk format of extended attributes for the ext4 filesystem.
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(C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
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*/
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#include <linux/xattr.h>
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/* Magic value in attribute blocks */
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#define EXT4_XATTR_MAGIC 0xEA020000
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/* Maximum number of references to one attribute block */
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#define EXT4_XATTR_REFCOUNT_MAX 1024
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/* Name indexes */
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#define EXT4_XATTR_INDEX_USER 1
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#define EXT4_XATTR_INDEX_POSIX_ACL_ACCESS 2
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#define EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT 3
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#define EXT4_XATTR_INDEX_TRUSTED 4
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#define EXT4_XATTR_INDEX_LUSTRE 5
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#define EXT4_XATTR_INDEX_SECURITY 6
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#define EXT4_XATTR_INDEX_SYSTEM 7
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#define EXT4_XATTR_INDEX_RICHACL 8
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#define EXT4_XATTR_INDEX_ENCRYPTION 9
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struct ext4_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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__le32 h_checksum; /* crc32c(uuid+id+xattrblock) */
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/* id = inum if refcount=1, blknum otherwise */
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__u32 h_reserved[3]; /* zero right now */
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};
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struct ext4_xattr_ibody_header {
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__le32 h_magic; /* magic number for identification */
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};
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struct ext4_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[0]; /* attribute name */
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};
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#define EXT4_XATTR_PAD_BITS 2
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#define EXT4_XATTR_PAD (1<<EXT4_XATTR_PAD_BITS)
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#define EXT4_XATTR_ROUND (EXT4_XATTR_PAD-1)
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#define EXT4_XATTR_LEN(name_len) \
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(((name_len) + EXT4_XATTR_ROUND + \
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sizeof(struct ext4_xattr_entry)) & ~EXT4_XATTR_ROUND)
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#define EXT4_XATTR_NEXT(entry) \
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((struct ext4_xattr_entry *)( \
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(char *)(entry) + EXT4_XATTR_LEN((entry)->e_name_len)))
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#define EXT4_XATTR_SIZE(size) \
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(((size) + EXT4_XATTR_ROUND) & ~EXT4_XATTR_ROUND)
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#define IHDR(inode, raw_inode) \
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((struct ext4_xattr_ibody_header *) \
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((void *)raw_inode + \
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EXT4_GOOD_OLD_INODE_SIZE + \
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EXT4_I(inode)->i_extra_isize))
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#define IFIRST(hdr) ((struct ext4_xattr_entry *)((hdr)+1))
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#define BHDR(bh) ((struct ext4_xattr_header *)((bh)->b_data))
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#define ENTRY(ptr) ((struct ext4_xattr_entry *)(ptr))
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#define BFIRST(bh) ENTRY(BHDR(bh)+1)
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#define IS_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0)
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#define EXT4_ZERO_XATTR_VALUE ((void *)-1)
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struct ext4_xattr_info {
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int name_index;
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const char *name;
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const void *value;
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size_t value_len;
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};
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struct ext4_xattr_search {
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struct ext4_xattr_entry *first;
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void *base;
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void *end;
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struct ext4_xattr_entry *here;
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int not_found;
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};
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struct ext4_xattr_ibody_find {
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struct ext4_xattr_search s;
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struct ext4_iloc iloc;
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};
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extern const struct xattr_handler ext4_xattr_user_handler;
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extern const struct xattr_handler ext4_xattr_trusted_handler;
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extern const struct xattr_handler ext4_xattr_security_handler;
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#define EXT4_XATTR_NAME_ENCRYPTION_CONTEXT "c"
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extern ssize_t ext4_listxattr(struct dentry *, char *, size_t);
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extern int ext4_xattr_get(struct inode *, int, const char *, void *, size_t);
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extern int ext4_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
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extern int ext4_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int);
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extern void ext4_xattr_delete_inode(handle_t *, struct inode *);
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extern void ext4_xattr_put_super(struct super_block *);
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extern int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
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struct ext4_inode *raw_inode, handle_t *handle);
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extern const struct xattr_handler *ext4_xattr_handlers[];
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extern int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i,
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struct ext4_xattr_ibody_find *is);
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extern int ext4_xattr_ibody_get(struct inode *inode, int name_index,
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const char *name,
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void *buffer, size_t buffer_size);
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extern int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode,
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struct ext4_xattr_info *i,
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struct ext4_xattr_ibody_find *is);
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extern struct mb_cache *ext4_xattr_create_cache(char *name);
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extern void ext4_xattr_destroy_cache(struct mb_cache *);
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#ifdef CONFIG_EXT4_FS_SECURITY
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extern int ext4_init_security(handle_t *handle, struct inode *inode,
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struct inode *dir, const struct qstr *qstr);
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#else
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static inline int ext4_init_security(handle_t *handle, struct inode *inode,
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struct inode *dir, 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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