/* * 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 VALID_XATTR_BLOCK_SIZE (PAGE_SIZE - sizeof(struct node_footer)) #define XATTR_PADDING_SIZE (sizeof(__u32)) #define MIN_OFFSET(i) XATTR_ALIGN(inline_xattr_size(i) + \ VALID_XATTR_BLOCK_SIZE) #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__ */