10a8165d7SJaegeuk Kim /* 2af48b85bSJaegeuk Kim * fs/f2fs/xattr.h 3af48b85bSJaegeuk Kim * 4af48b85bSJaegeuk Kim * Copyright (c) 2012 Samsung Electronics Co., Ltd. 5af48b85bSJaegeuk Kim * http://www.samsung.com/ 6af48b85bSJaegeuk Kim * 7af48b85bSJaegeuk Kim * Portions of this code from linux/fs/ext2/xattr.h 8af48b85bSJaegeuk Kim * 9af48b85bSJaegeuk Kim * On-disk format of extended attributes for the ext2 filesystem. 10af48b85bSJaegeuk Kim * 11af48b85bSJaegeuk Kim * (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org> 12af48b85bSJaegeuk Kim * 13af48b85bSJaegeuk Kim * This program is free software; you can redistribute it and/or modify 14af48b85bSJaegeuk Kim * it under the terms of the GNU General Public License version 2 as 15af48b85bSJaegeuk Kim * published by the Free Software Foundation. 16af48b85bSJaegeuk Kim */ 17af48b85bSJaegeuk Kim #ifndef __F2FS_XATTR_H__ 18af48b85bSJaegeuk Kim #define __F2FS_XATTR_H__ 19af48b85bSJaegeuk Kim 20af48b85bSJaegeuk Kim #include <linux/init.h> 21af48b85bSJaegeuk Kim #include <linux/xattr.h> 22af48b85bSJaegeuk Kim 23af48b85bSJaegeuk Kim /* Magic value in attribute blocks */ 24af48b85bSJaegeuk Kim #define F2FS_XATTR_MAGIC 0xF2F52011 25af48b85bSJaegeuk Kim 26af48b85bSJaegeuk Kim /* Maximum number of references to one attribute block */ 27af48b85bSJaegeuk Kim #define F2FS_XATTR_REFCOUNT_MAX 1024 28af48b85bSJaegeuk Kim 29af48b85bSJaegeuk Kim /* Name indexes */ 3098e9cb57SAndreas Gruenbacher #define F2FS_SYSTEM_ADVISE_NAME "system.advise" 31af48b85bSJaegeuk Kim #define F2FS_XATTR_INDEX_USER 1 32af48b85bSJaegeuk Kim #define F2FS_XATTR_INDEX_POSIX_ACL_ACCESS 2 33af48b85bSJaegeuk Kim #define F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT 3 34af48b85bSJaegeuk Kim #define F2FS_XATTR_INDEX_TRUSTED 4 35af48b85bSJaegeuk Kim #define F2FS_XATTR_INDEX_LUSTRE 5 36af48b85bSJaegeuk Kim #define F2FS_XATTR_INDEX_SECURITY 6 37af48b85bSJaegeuk Kim #define F2FS_XATTR_INDEX_ADVISE 7 38b93531ddSJaegeuk Kim /* Should be same as EXT4_XATTR_INDEX_ENCRYPTION */ 39b93531ddSJaegeuk Kim #define F2FS_XATTR_INDEX_ENCRYPTION 9 40b93531ddSJaegeuk Kim 41b93531ddSJaegeuk Kim #define F2FS_XATTR_NAME_ENCRYPTION_CONTEXT "c" 42af48b85bSJaegeuk Kim 43af48b85bSJaegeuk Kim struct f2fs_xattr_header { 44af48b85bSJaegeuk Kim __le32 h_magic; /* magic number for identification */ 45af48b85bSJaegeuk Kim __le32 h_refcount; /* reference count */ 46af48b85bSJaegeuk Kim __u32 h_reserved[4]; /* zero right now */ 47af48b85bSJaegeuk Kim }; 48af48b85bSJaegeuk Kim 49af48b85bSJaegeuk Kim struct f2fs_xattr_entry { 50af48b85bSJaegeuk Kim __u8 e_name_index; 51af48b85bSJaegeuk Kim __u8 e_name_len; 52af48b85bSJaegeuk Kim __le16 e_value_size; /* size of attribute value */ 53af48b85bSJaegeuk Kim char e_name[0]; /* attribute name */ 54af48b85bSJaegeuk Kim }; 55af48b85bSJaegeuk Kim 56af48b85bSJaegeuk Kim #define XATTR_HDR(ptr) ((struct f2fs_xattr_header *)(ptr)) 57af48b85bSJaegeuk Kim #define XATTR_ENTRY(ptr) ((struct f2fs_xattr_entry *)(ptr)) 58af48b85bSJaegeuk Kim #define XATTR_FIRST_ENTRY(ptr) (XATTR_ENTRY(XATTR_HDR(ptr) + 1)) 59af48b85bSJaegeuk Kim #define XATTR_ROUND (3) 60af48b85bSJaegeuk Kim 61af48b85bSJaegeuk Kim #define XATTR_ALIGN(size) ((size + XATTR_ROUND) & ~XATTR_ROUND) 62af48b85bSJaegeuk Kim 63af48b85bSJaegeuk Kim #define ENTRY_SIZE(entry) (XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + \ 64af48b85bSJaegeuk Kim entry->e_name_len + le16_to_cpu(entry->e_value_size))) 65af48b85bSJaegeuk Kim 66af48b85bSJaegeuk Kim #define XATTR_NEXT_ENTRY(entry) ((struct f2fs_xattr_entry *)((char *)(entry) +\ 67af48b85bSJaegeuk Kim ENTRY_SIZE(entry))) 68af48b85bSJaegeuk Kim 69af48b85bSJaegeuk Kim #define IS_XATTR_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0) 70af48b85bSJaegeuk Kim 71af48b85bSJaegeuk Kim #define list_for_each_xattr(entry, addr) \ 72af48b85bSJaegeuk Kim for (entry = XATTR_FIRST_ENTRY(addr);\ 73af48b85bSJaegeuk Kim !IS_XATTR_LAST_ENTRY(entry);\ 74af48b85bSJaegeuk Kim entry = XATTR_NEXT_ENTRY(entry)) 75af48b85bSJaegeuk Kim 7665985d93SJaegeuk Kim #define MIN_OFFSET(i) XATTR_ALIGN(inline_xattr_size(i) + PAGE_SIZE - \ 7765985d93SJaegeuk Kim sizeof(struct node_footer) - sizeof(__u32)) 78af48b85bSJaegeuk Kim 7965985d93SJaegeuk Kim #define MAX_VALUE_LEN(i) (MIN_OFFSET(i) - \ 8065985d93SJaegeuk Kim sizeof(struct f2fs_xattr_header) - \ 81af48b85bSJaegeuk Kim sizeof(struct f2fs_xattr_entry)) 82af48b85bSJaegeuk Kim 830a8165d7SJaegeuk Kim /* 84af48b85bSJaegeuk Kim * On-disk structure of f2fs_xattr 8565985d93SJaegeuk Kim * We use inline xattrs space + 1 block for xattr. 86af48b85bSJaegeuk Kim * 87af48b85bSJaegeuk Kim * +--------------------+ 88af48b85bSJaegeuk Kim * | f2fs_xattr_header | 89af48b85bSJaegeuk Kim * | | 90af48b85bSJaegeuk Kim * +--------------------+ 91af48b85bSJaegeuk Kim * | f2fs_xattr_entry | 92af48b85bSJaegeuk Kim * | .e_name_index = 1 | 93af48b85bSJaegeuk Kim * | .e_name_len = 3 | 94af48b85bSJaegeuk Kim * | .e_value_size = 14 | 95af48b85bSJaegeuk Kim * | .e_name = "foo" | 96af48b85bSJaegeuk Kim * | "value_of_xattr" |<- value_offs = e_name + e_name_len 97af48b85bSJaegeuk Kim * +--------------------+ 98af48b85bSJaegeuk Kim * | f2fs_xattr_entry | 99af48b85bSJaegeuk Kim * | .e_name_index = 4 | 100af48b85bSJaegeuk Kim * | .e_name = "bar" | 101af48b85bSJaegeuk Kim * +--------------------+ 102af48b85bSJaegeuk Kim * | | 103af48b85bSJaegeuk Kim * | Free | 104af48b85bSJaegeuk Kim * | | 105af48b85bSJaegeuk Kim * +--------------------+<- MIN_OFFSET 106af48b85bSJaegeuk Kim * | node_footer | 107af48b85bSJaegeuk Kim * | (nid, ino, offset) | 108af48b85bSJaegeuk Kim * +--------------------+ 109af48b85bSJaegeuk Kim * 110af48b85bSJaegeuk Kim **/ 111af48b85bSJaegeuk Kim 112af48b85bSJaegeuk Kim #ifdef CONFIG_F2FS_FS_XATTR 113af48b85bSJaegeuk Kim extern const struct xattr_handler f2fs_xattr_user_handler; 114af48b85bSJaegeuk Kim extern const struct xattr_handler f2fs_xattr_trusted_handler; 115af48b85bSJaegeuk Kim extern const struct xattr_handler f2fs_xattr_advise_handler; 1168ae8f162SJaegeuk Kim extern const struct xattr_handler f2fs_xattr_security_handler; 117af48b85bSJaegeuk Kim 118af48b85bSJaegeuk Kim extern const struct xattr_handler *f2fs_xattr_handlers[]; 119af48b85bSJaegeuk Kim 1208ae8f162SJaegeuk Kim extern int f2fs_setxattr(struct inode *, int, const char *, 121c02745efSJaegeuk Kim const void *, size_t, struct page *, int); 122bce8d112SJaegeuk Kim extern int f2fs_getxattr(struct inode *, int, const char *, void *, 123bce8d112SJaegeuk Kim size_t, struct page *); 1248ae8f162SJaegeuk Kim extern ssize_t f2fs_listxattr(struct dentry *, char *, size_t); 125af48b85bSJaegeuk Kim #else 126af48b85bSJaegeuk Kim 127af48b85bSJaegeuk Kim #define f2fs_xattr_handlers NULL 128e1123268SJaegeuk Kim static inline int f2fs_setxattr(struct inode *inode, int index, 129*fff4c55dSArnd Bergmann const char *name, const void *value, size_t size, 130*fff4c55dSArnd Bergmann struct page *page, int flags) 131af48b85bSJaegeuk Kim { 132af48b85bSJaegeuk Kim return -EOPNOTSUPP; 133af48b85bSJaegeuk Kim } 134e1123268SJaegeuk Kim static inline int f2fs_getxattr(struct inode *inode, int index, 135bce8d112SJaegeuk Kim const char *name, void *buffer, 136bce8d112SJaegeuk Kim size_t buffer_size, struct page *dpage) 137af48b85bSJaegeuk Kim { 138af48b85bSJaegeuk Kim return -EOPNOTSUPP; 139af48b85bSJaegeuk Kim } 140af48b85bSJaegeuk Kim static inline ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, 141af48b85bSJaegeuk Kim size_t buffer_size) 142af48b85bSJaegeuk Kim { 143af48b85bSJaegeuk Kim return -EOPNOTSUPP; 144af48b85bSJaegeuk Kim } 145af48b85bSJaegeuk Kim #endif 146af48b85bSJaegeuk Kim 1478ae8f162SJaegeuk Kim #ifdef CONFIG_F2FS_FS_SECURITY 1488ae8f162SJaegeuk Kim extern int f2fs_init_security(struct inode *, struct inode *, 1498ae8f162SJaegeuk Kim const struct qstr *, struct page *); 1508ae8f162SJaegeuk Kim #else 1518ae8f162SJaegeuk Kim static inline int f2fs_init_security(struct inode *inode, struct inode *dir, 1528ae8f162SJaegeuk Kim const struct qstr *qstr, struct page *ipage) 1538ae8f162SJaegeuk Kim { 1548ae8f162SJaegeuk Kim return 0; 1558ae8f162SJaegeuk Kim } 1568ae8f162SJaegeuk Kim #endif 157af48b85bSJaegeuk Kim #endif /* __F2FS_XATTR_H__ */ 158