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 */ 30af48b85bSJaegeuk Kim #define F2FS_SYSTEM_ADVISE_PREFIX "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 38af48b85bSJaegeuk Kim 39af48b85bSJaegeuk Kim struct f2fs_xattr_header { 40af48b85bSJaegeuk Kim __le32 h_magic; /* magic number for identification */ 41af48b85bSJaegeuk Kim __le32 h_refcount; /* reference count */ 42af48b85bSJaegeuk Kim __u32 h_reserved[4]; /* zero right now */ 43af48b85bSJaegeuk Kim }; 44af48b85bSJaegeuk Kim 45af48b85bSJaegeuk Kim struct f2fs_xattr_entry { 46af48b85bSJaegeuk Kim __u8 e_name_index; 47af48b85bSJaegeuk Kim __u8 e_name_len; 48af48b85bSJaegeuk Kim __le16 e_value_size; /* size of attribute value */ 49af48b85bSJaegeuk Kim char e_name[0]; /* attribute name */ 50af48b85bSJaegeuk Kim }; 51af48b85bSJaegeuk Kim 52af48b85bSJaegeuk Kim #define XATTR_HDR(ptr) ((struct f2fs_xattr_header *)(ptr)) 53af48b85bSJaegeuk Kim #define XATTR_ENTRY(ptr) ((struct f2fs_xattr_entry *)(ptr)) 54af48b85bSJaegeuk Kim #define XATTR_FIRST_ENTRY(ptr) (XATTR_ENTRY(XATTR_HDR(ptr) + 1)) 55af48b85bSJaegeuk Kim #define XATTR_ROUND (3) 56af48b85bSJaegeuk Kim 57af48b85bSJaegeuk Kim #define XATTR_ALIGN(size) ((size + XATTR_ROUND) & ~XATTR_ROUND) 58af48b85bSJaegeuk Kim 59af48b85bSJaegeuk Kim #define ENTRY_SIZE(entry) (XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + \ 60af48b85bSJaegeuk Kim entry->e_name_len + le16_to_cpu(entry->e_value_size))) 61af48b85bSJaegeuk Kim 62af48b85bSJaegeuk Kim #define XATTR_NEXT_ENTRY(entry) ((struct f2fs_xattr_entry *)((char *)(entry) +\ 63af48b85bSJaegeuk Kim ENTRY_SIZE(entry))) 64af48b85bSJaegeuk Kim 65af48b85bSJaegeuk Kim #define IS_XATTR_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0) 66af48b85bSJaegeuk Kim 67af48b85bSJaegeuk Kim #define list_for_each_xattr(entry, addr) \ 68af48b85bSJaegeuk Kim for (entry = XATTR_FIRST_ENTRY(addr);\ 69af48b85bSJaegeuk Kim !IS_XATTR_LAST_ENTRY(entry);\ 70af48b85bSJaegeuk Kim entry = XATTR_NEXT_ENTRY(entry)) 71af48b85bSJaegeuk Kim 72*65985d93SJaegeuk Kim #define MIN_OFFSET(i) XATTR_ALIGN(inline_xattr_size(i) + PAGE_SIZE - \ 73*65985d93SJaegeuk Kim sizeof(struct node_footer) - sizeof(__u32)) 74af48b85bSJaegeuk Kim 75*65985d93SJaegeuk Kim #define MAX_VALUE_LEN(i) (MIN_OFFSET(i) - \ 76*65985d93SJaegeuk Kim sizeof(struct f2fs_xattr_header) - \ 77af48b85bSJaegeuk Kim sizeof(struct f2fs_xattr_entry)) 78af48b85bSJaegeuk Kim 790a8165d7SJaegeuk Kim /* 80af48b85bSJaegeuk Kim * On-disk structure of f2fs_xattr 81*65985d93SJaegeuk Kim * We use inline xattrs space + 1 block for xattr. 82af48b85bSJaegeuk Kim * 83af48b85bSJaegeuk Kim * +--------------------+ 84af48b85bSJaegeuk Kim * | f2fs_xattr_header | 85af48b85bSJaegeuk Kim * | | 86af48b85bSJaegeuk Kim * +--------------------+ 87af48b85bSJaegeuk Kim * | f2fs_xattr_entry | 88af48b85bSJaegeuk Kim * | .e_name_index = 1 | 89af48b85bSJaegeuk Kim * | .e_name_len = 3 | 90af48b85bSJaegeuk Kim * | .e_value_size = 14 | 91af48b85bSJaegeuk Kim * | .e_name = "foo" | 92af48b85bSJaegeuk Kim * | "value_of_xattr" |<- value_offs = e_name + e_name_len 93af48b85bSJaegeuk Kim * +--------------------+ 94af48b85bSJaegeuk Kim * | f2fs_xattr_entry | 95af48b85bSJaegeuk Kim * | .e_name_index = 4 | 96af48b85bSJaegeuk Kim * | .e_name = "bar" | 97af48b85bSJaegeuk Kim * +--------------------+ 98af48b85bSJaegeuk Kim * | | 99af48b85bSJaegeuk Kim * | Free | 100af48b85bSJaegeuk Kim * | | 101af48b85bSJaegeuk Kim * +--------------------+<- MIN_OFFSET 102af48b85bSJaegeuk Kim * | node_footer | 103af48b85bSJaegeuk Kim * | (nid, ino, offset) | 104af48b85bSJaegeuk Kim * +--------------------+ 105af48b85bSJaegeuk Kim * 106af48b85bSJaegeuk Kim **/ 107af48b85bSJaegeuk Kim 108af48b85bSJaegeuk Kim #ifdef CONFIG_F2FS_FS_XATTR 109af48b85bSJaegeuk Kim extern const struct xattr_handler f2fs_xattr_user_handler; 110af48b85bSJaegeuk Kim extern const struct xattr_handler f2fs_xattr_trusted_handler; 111af48b85bSJaegeuk Kim extern const struct xattr_handler f2fs_xattr_acl_access_handler; 112af48b85bSJaegeuk Kim extern const struct xattr_handler f2fs_xattr_acl_default_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 *, 1198ae8f162SJaegeuk Kim const void *, size_t, struct page *); 1208ae8f162SJaegeuk Kim extern int f2fs_getxattr(struct inode *, int, const char *, void *, size_t); 1218ae8f162SJaegeuk Kim extern ssize_t f2fs_listxattr(struct dentry *, char *, size_t); 122af48b85bSJaegeuk Kim #else 123af48b85bSJaegeuk Kim 124af48b85bSJaegeuk Kim #define f2fs_xattr_handlers NULL 125af48b85bSJaegeuk Kim static inline int f2fs_setxattr(struct inode *inode, int name_index, 126af48b85bSJaegeuk Kim const char *name, const void *value, size_t value_len) 127af48b85bSJaegeuk Kim { 128af48b85bSJaegeuk Kim return -EOPNOTSUPP; 129af48b85bSJaegeuk Kim } 130af48b85bSJaegeuk Kim static inline int f2fs_getxattr(struct inode *inode, int name_index, 131af48b85bSJaegeuk Kim const char *name, void *buffer, size_t buffer_size) 132af48b85bSJaegeuk Kim { 133af48b85bSJaegeuk Kim return -EOPNOTSUPP; 134af48b85bSJaegeuk Kim } 135af48b85bSJaegeuk Kim static inline ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, 136af48b85bSJaegeuk Kim size_t buffer_size) 137af48b85bSJaegeuk Kim { 138af48b85bSJaegeuk Kim return -EOPNOTSUPP; 139af48b85bSJaegeuk Kim } 140af48b85bSJaegeuk Kim #endif 141af48b85bSJaegeuk Kim 1428ae8f162SJaegeuk Kim #ifdef CONFIG_F2FS_FS_SECURITY 1438ae8f162SJaegeuk Kim extern int f2fs_init_security(struct inode *, struct inode *, 1448ae8f162SJaegeuk Kim const struct qstr *, struct page *); 1458ae8f162SJaegeuk Kim #else 1468ae8f162SJaegeuk Kim static inline int f2fs_init_security(struct inode *inode, struct inode *dir, 1478ae8f162SJaegeuk Kim const struct qstr *qstr, struct page *ipage) 1488ae8f162SJaegeuk Kim { 1498ae8f162SJaegeuk Kim return 0; 1508ae8f162SJaegeuk Kim } 1518ae8f162SJaegeuk Kim #endif 152af48b85bSJaegeuk Kim #endif /* __F2FS_XATTR_H__ */ 153