1*7c1a000dSChao Yu // SPDX-License-Identifier: GPL-2.0 20a8165d7SJaegeuk Kim /* 3af48b85bSJaegeuk Kim * fs/f2fs/xattr.h 4af48b85bSJaegeuk Kim * 5af48b85bSJaegeuk Kim * Copyright (c) 2012 Samsung Electronics Co., Ltd. 6af48b85bSJaegeuk Kim * http://www.samsung.com/ 7af48b85bSJaegeuk Kim * 8af48b85bSJaegeuk Kim * Portions of this code from linux/fs/ext2/xattr.h 9af48b85bSJaegeuk Kim * 10af48b85bSJaegeuk Kim * On-disk format of extended attributes for the ext2 filesystem. 11af48b85bSJaegeuk Kim * 12af48b85bSJaegeuk Kim * (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org> 13af48b85bSJaegeuk Kim */ 14af48b85bSJaegeuk Kim #ifndef __F2FS_XATTR_H__ 15af48b85bSJaegeuk Kim #define __F2FS_XATTR_H__ 16af48b85bSJaegeuk Kim 17af48b85bSJaegeuk Kim #include <linux/init.h> 18af48b85bSJaegeuk Kim #include <linux/xattr.h> 19af48b85bSJaegeuk Kim 20af48b85bSJaegeuk Kim /* Magic value in attribute blocks */ 21af48b85bSJaegeuk Kim #define F2FS_XATTR_MAGIC 0xF2F52011 22af48b85bSJaegeuk Kim 23af48b85bSJaegeuk Kim /* Maximum number of references to one attribute block */ 24af48b85bSJaegeuk Kim #define F2FS_XATTR_REFCOUNT_MAX 1024 25af48b85bSJaegeuk Kim 26af48b85bSJaegeuk Kim /* Name indexes */ 2798e9cb57SAndreas Gruenbacher #define F2FS_SYSTEM_ADVISE_NAME "system.advise" 28af48b85bSJaegeuk Kim #define F2FS_XATTR_INDEX_USER 1 29af48b85bSJaegeuk Kim #define F2FS_XATTR_INDEX_POSIX_ACL_ACCESS 2 30af48b85bSJaegeuk Kim #define F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT 3 31af48b85bSJaegeuk Kim #define F2FS_XATTR_INDEX_TRUSTED 4 32af48b85bSJaegeuk Kim #define F2FS_XATTR_INDEX_LUSTRE 5 33af48b85bSJaegeuk Kim #define F2FS_XATTR_INDEX_SECURITY 6 34af48b85bSJaegeuk Kim #define F2FS_XATTR_INDEX_ADVISE 7 35b93531ddSJaegeuk Kim /* Should be same as EXT4_XATTR_INDEX_ENCRYPTION */ 36b93531ddSJaegeuk Kim #define F2FS_XATTR_INDEX_ENCRYPTION 9 37b93531ddSJaegeuk Kim 38b93531ddSJaegeuk Kim #define F2FS_XATTR_NAME_ENCRYPTION_CONTEXT "c" 39af48b85bSJaegeuk Kim 40af48b85bSJaegeuk Kim struct f2fs_xattr_header { 41af48b85bSJaegeuk Kim __le32 h_magic; /* magic number for identification */ 42af48b85bSJaegeuk Kim __le32 h_refcount; /* reference count */ 43af48b85bSJaegeuk Kim __u32 h_reserved[4]; /* zero right now */ 44af48b85bSJaegeuk Kim }; 45af48b85bSJaegeuk Kim 46af48b85bSJaegeuk Kim struct f2fs_xattr_entry { 47af48b85bSJaegeuk Kim __u8 e_name_index; 48af48b85bSJaegeuk Kim __u8 e_name_len; 49af48b85bSJaegeuk Kim __le16 e_value_size; /* size of attribute value */ 50af48b85bSJaegeuk Kim char e_name[0]; /* attribute name */ 51af48b85bSJaegeuk Kim }; 52af48b85bSJaegeuk Kim 53af48b85bSJaegeuk Kim #define XATTR_HDR(ptr) ((struct f2fs_xattr_header *)(ptr)) 54af48b85bSJaegeuk Kim #define XATTR_ENTRY(ptr) ((struct f2fs_xattr_entry *)(ptr)) 55af48b85bSJaegeuk Kim #define XATTR_FIRST_ENTRY(ptr) (XATTR_ENTRY(XATTR_HDR(ptr) + 1)) 56af48b85bSJaegeuk Kim #define XATTR_ROUND (3) 57af48b85bSJaegeuk Kim 5868afcf2dSTomohiro Kusumi #define XATTR_ALIGN(size) (((size) + XATTR_ROUND) & ~XATTR_ROUND) 59af48b85bSJaegeuk Kim 60af48b85bSJaegeuk Kim #define ENTRY_SIZE(entry) (XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + \ 6168afcf2dSTomohiro Kusumi (entry)->e_name_len + le16_to_cpu((entry)->e_value_size))) 62af48b85bSJaegeuk Kim 63af48b85bSJaegeuk Kim #define XATTR_NEXT_ENTRY(entry) ((struct f2fs_xattr_entry *)((char *)(entry) +\ 64af48b85bSJaegeuk Kim ENTRY_SIZE(entry))) 65af48b85bSJaegeuk Kim 66af48b85bSJaegeuk Kim #define IS_XATTR_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0) 67af48b85bSJaegeuk Kim 68af48b85bSJaegeuk Kim #define list_for_each_xattr(entry, addr) \ 69af48b85bSJaegeuk Kim for (entry = XATTR_FIRST_ENTRY(addr);\ 70af48b85bSJaegeuk Kim !IS_XATTR_LAST_ENTRY(entry);\ 71af48b85bSJaegeuk Kim entry = XATTR_NEXT_ENTRY(entry)) 7222588f87SChao Yu #define VALID_XATTR_BLOCK_SIZE (PAGE_SIZE - sizeof(struct node_footer)) 7322588f87SChao Yu #define XATTR_PADDING_SIZE (sizeof(__u32)) 74ba38c27eSChao Yu #define MIN_OFFSET(i) XATTR_ALIGN(inline_xattr_size(i) + \ 75ba38c27eSChao Yu VALID_XATTR_BLOCK_SIZE) 76af48b85bSJaegeuk Kim 7765985d93SJaegeuk Kim #define MAX_VALUE_LEN(i) (MIN_OFFSET(i) - \ 7865985d93SJaegeuk Kim sizeof(struct f2fs_xattr_header) - \ 79af48b85bSJaegeuk Kim sizeof(struct f2fs_xattr_entry)) 80af48b85bSJaegeuk Kim 810a8165d7SJaegeuk Kim /* 82af48b85bSJaegeuk Kim * On-disk structure of f2fs_xattr 8365985d93SJaegeuk Kim * We use inline xattrs space + 1 block for xattr. 84af48b85bSJaegeuk Kim * 85af48b85bSJaegeuk Kim * +--------------------+ 86af48b85bSJaegeuk Kim * | f2fs_xattr_header | 87af48b85bSJaegeuk Kim * | | 88af48b85bSJaegeuk Kim * +--------------------+ 89af48b85bSJaegeuk Kim * | f2fs_xattr_entry | 90af48b85bSJaegeuk Kim * | .e_name_index = 1 | 91af48b85bSJaegeuk Kim * | .e_name_len = 3 | 92af48b85bSJaegeuk Kim * | .e_value_size = 14 | 93af48b85bSJaegeuk Kim * | .e_name = "foo" | 94af48b85bSJaegeuk Kim * | "value_of_xattr" |<- value_offs = e_name + e_name_len 95af48b85bSJaegeuk Kim * +--------------------+ 96af48b85bSJaegeuk Kim * | f2fs_xattr_entry | 97af48b85bSJaegeuk Kim * | .e_name_index = 4 | 98af48b85bSJaegeuk Kim * | .e_name = "bar" | 99af48b85bSJaegeuk Kim * +--------------------+ 100af48b85bSJaegeuk Kim * | | 101af48b85bSJaegeuk Kim * | Free | 102af48b85bSJaegeuk Kim * | | 103af48b85bSJaegeuk Kim * +--------------------+<- MIN_OFFSET 104af48b85bSJaegeuk Kim * | node_footer | 105af48b85bSJaegeuk Kim * | (nid, ino, offset) | 106af48b85bSJaegeuk Kim * +--------------------+ 107af48b85bSJaegeuk Kim * 108af48b85bSJaegeuk Kim **/ 109af48b85bSJaegeuk Kim 110af48b85bSJaegeuk Kim #ifdef CONFIG_F2FS_FS_XATTR 111af48b85bSJaegeuk Kim extern const struct xattr_handler f2fs_xattr_user_handler; 112af48b85bSJaegeuk Kim extern const struct xattr_handler f2fs_xattr_trusted_handler; 113af48b85bSJaegeuk Kim extern const struct xattr_handler f2fs_xattr_advise_handler; 1148ae8f162SJaegeuk Kim extern const struct xattr_handler f2fs_xattr_security_handler; 115af48b85bSJaegeuk Kim 116af48b85bSJaegeuk Kim extern const struct xattr_handler *f2fs_xattr_handlers[]; 117af48b85bSJaegeuk Kim 1188ae8f162SJaegeuk Kim extern int f2fs_setxattr(struct inode *, int, const char *, 119c02745efSJaegeuk Kim const void *, size_t, struct page *, int); 120bce8d112SJaegeuk Kim extern int f2fs_getxattr(struct inode *, int, const char *, void *, 121bce8d112SJaegeuk Kim size_t, struct page *); 1228ae8f162SJaegeuk Kim extern ssize_t f2fs_listxattr(struct dentry *, char *, size_t); 123af48b85bSJaegeuk Kim #else 124af48b85bSJaegeuk Kim 125af48b85bSJaegeuk Kim #define f2fs_xattr_handlers NULL 126e1123268SJaegeuk Kim static inline int f2fs_setxattr(struct inode *inode, int index, 127fff4c55dSArnd Bergmann const char *name, const void *value, size_t size, 128fff4c55dSArnd Bergmann struct page *page, int flags) 129af48b85bSJaegeuk Kim { 130af48b85bSJaegeuk Kim return -EOPNOTSUPP; 131af48b85bSJaegeuk Kim } 132e1123268SJaegeuk Kim static inline int f2fs_getxattr(struct inode *inode, int index, 133bce8d112SJaegeuk Kim const char *name, void *buffer, 134bce8d112SJaegeuk Kim size_t buffer_size, struct page *dpage) 135af48b85bSJaegeuk Kim { 136af48b85bSJaegeuk Kim return -EOPNOTSUPP; 137af48b85bSJaegeuk Kim } 138af48b85bSJaegeuk Kim static inline ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, 139af48b85bSJaegeuk Kim size_t buffer_size) 140af48b85bSJaegeuk Kim { 141af48b85bSJaegeuk Kim return -EOPNOTSUPP; 142af48b85bSJaegeuk Kim } 143af48b85bSJaegeuk Kim #endif 144af48b85bSJaegeuk Kim 1458ae8f162SJaegeuk Kim #ifdef CONFIG_F2FS_FS_SECURITY 1468ae8f162SJaegeuk Kim extern int f2fs_init_security(struct inode *, struct inode *, 1478ae8f162SJaegeuk Kim const struct qstr *, struct page *); 1488ae8f162SJaegeuk Kim #else 1498ae8f162SJaegeuk Kim static inline int f2fs_init_security(struct inode *inode, struct inode *dir, 1508ae8f162SJaegeuk Kim const struct qstr *qstr, struct page *ipage) 1518ae8f162SJaegeuk Kim { 1528ae8f162SJaegeuk Kim return 0; 1538ae8f162SJaegeuk Kim } 1548ae8f162SJaegeuk Kim #endif 155af48b85bSJaegeuk Kim #endif /* __F2FS_XATTR_H__ */ 156