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- /*
- * fs/f2fs/xattr.h
- *
- * Copyright (c) 2012 Samsung Electronics Co., Ltd.
- * http://www.samsung.com/
- *
- * Portions of this code from linux/fs/ext2/xattr.h
- *
- * On-disk format of extended attributes for the ext2 filesystem.
- *
- * (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
- #ifndef __F2FS_XATTR_H__
- #define __F2FS_XATTR_H__
- #include <linux/init.h>
- #include <linux/xattr.h>
- /* Magic value in attribute blocks */
- #define F2FS_XATTR_MAGIC 0xF2F52011
- /* Maximum number of references to one attribute block */
- #define F2FS_XATTR_REFCOUNT_MAX 1024
- /* Name indexes */
- #define F2FS_SYSTEM_ADVISE_NAME "system.advise"
- #define F2FS_XATTR_INDEX_USER 1
- #define F2FS_XATTR_INDEX_POSIX_ACL_ACCESS 2
- #define F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT 3
- #define F2FS_XATTR_INDEX_TRUSTED 4
- #define F2FS_XATTR_INDEX_LUSTRE 5
- #define F2FS_XATTR_INDEX_SECURITY 6
- #define F2FS_XATTR_INDEX_ADVISE 7
- /* Should be same as EXT4_XATTR_INDEX_ENCRYPTION */
- #define F2FS_XATTR_INDEX_ENCRYPTION 9
- #define F2FS_XATTR_NAME_ENCRYPTION_CONTEXT "c"
- struct f2fs_xattr_header {
- __le32 h_magic; /* magic number for identification */
- __le32 h_refcount; /* reference count */
- __u32 h_reserved[4]; /* zero right now */
- };
- struct f2fs_xattr_entry {
- __u8 e_name_index;
- __u8 e_name_len;
- __le16 e_value_size; /* size of attribute value */
- char e_name[0]; /* attribute name */
- };
- #define XATTR_HDR(ptr) ((struct f2fs_xattr_header *)(ptr))
- #define XATTR_ENTRY(ptr) ((struct f2fs_xattr_entry *)(ptr))
- #define XATTR_FIRST_ENTRY(ptr) (XATTR_ENTRY(XATTR_HDR(ptr) + 1))
- #define XATTR_ROUND (3)
- #define XATTR_ALIGN(size) ((size + XATTR_ROUND) & ~XATTR_ROUND)
- #define ENTRY_SIZE(entry) (XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + \
- entry->e_name_len + le16_to_cpu(entry->e_value_size)))
- #define XATTR_NEXT_ENTRY(entry) ((struct f2fs_xattr_entry *)((char *)(entry) +\
- ENTRY_SIZE(entry)))
- #define IS_XATTR_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0)
- #define list_for_each_xattr(entry, addr) \
- for (entry = XATTR_FIRST_ENTRY(addr);\
- !IS_XATTR_LAST_ENTRY(entry);\
- entry = XATTR_NEXT_ENTRY(entry))
- #define MIN_OFFSET(i) XATTR_ALIGN(inline_xattr_size(i) + PAGE_SIZE - \
- sizeof(struct node_footer) - sizeof(__u32))
- #define MAX_VALUE_LEN(i) (MIN_OFFSET(i) - \
- sizeof(struct f2fs_xattr_header) - \
- sizeof(struct f2fs_xattr_entry))
- /*
- * On-disk structure of f2fs_xattr
- * We use inline xattrs space + 1 block for xattr.
- *
- * +--------------------+
- * | f2fs_xattr_header |
- * | |
- * +--------------------+
- * | f2fs_xattr_entry |
- * | .e_name_index = 1 |
- * | .e_name_len = 3 |
- * | .e_value_size = 14 |
- * | .e_name = "foo" |
- * | "value_of_xattr" |<- value_offs = e_name + e_name_len
- * +--------------------+
- * | f2fs_xattr_entry |
- * | .e_name_index = 4 |
- * | .e_name = "bar" |
- * +--------------------+
- * | |
- * | Free |
- * | |
- * +--------------------+<- MIN_OFFSET
- * | node_footer |
- * | (nid, ino, offset) |
- * +--------------------+
- *
- **/
- #ifdef CONFIG_F2FS_FS_XATTR
- extern const struct xattr_handler f2fs_xattr_user_handler;
- extern const struct xattr_handler f2fs_xattr_trusted_handler;
- extern const struct xattr_handler f2fs_xattr_advise_handler;
- extern const struct xattr_handler f2fs_xattr_security_handler;
- extern const struct xattr_handler *f2fs_xattr_handlers[];
- extern int f2fs_setxattr(struct inode *, int, const char *,
- const void *, size_t, struct page *, int);
- extern int f2fs_getxattr(struct inode *, int, const char *, void *,
- size_t, struct page *);
- extern ssize_t f2fs_listxattr(struct dentry *, char *, size_t);
- #else
- #define f2fs_xattr_handlers NULL
- static inline int f2fs_setxattr(struct inode *inode, int index,
- const char *name, const void *value, size_t size,
- struct page *page, int flags)
- {
- return -EOPNOTSUPP;
- }
- static inline int f2fs_getxattr(struct inode *inode, int index,
- const char *name, void *buffer,
- size_t buffer_size, struct page *dpage)
- {
- return -EOPNOTSUPP;
- }
- static inline ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer,
- size_t buffer_size)
- {
- return -EOPNOTSUPP;
- }
- #endif
- #ifdef CONFIG_F2FS_FS_SECURITY
- extern int f2fs_init_security(struct inode *, struct inode *,
- const struct qstr *, struct page *);
- #else
- static inline int f2fs_init_security(struct inode *inode, struct inode *dir,
- const struct qstr *qstr, struct page *ipage)
- {
- return 0;
- }
- #endif
- #endif /* __F2FS_XATTR_H__ */
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