1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2017-2018 HUAWEI, Inc. 4 * http://www.huawei.com/ 5 * Created by Gao Xiang <gaoxiang25@huawei.com> 6 */ 7 #ifndef __EROFS_XATTR_H 8 #define __EROFS_XATTR_H 9 10 #include "internal.h" 11 #include <linux/posix_acl_xattr.h> 12 #include <linux/xattr.h> 13 14 /* Attribute not found */ 15 #define ENOATTR ENODATA 16 17 static inline unsigned int inlinexattr_header_size(struct inode *inode) 18 { 19 return sizeof(struct erofs_xattr_ibody_header) + 20 sizeof(u32) * EROFS_I(inode)->xattr_shared_count; 21 } 22 23 static inline erofs_blk_t xattrblock_addr(struct erofs_sb_info *sbi, 24 unsigned int xattr_id) 25 { 26 #ifdef CONFIG_EROFS_FS_XATTR 27 return sbi->xattr_blkaddr + 28 xattr_id * sizeof(__u32) / EROFS_BLKSIZ; 29 #else 30 return 0; 31 #endif 32 } 33 34 static inline unsigned int xattrblock_offset(struct erofs_sb_info *sbi, 35 unsigned int xattr_id) 36 { 37 return (xattr_id * sizeof(__u32)) % EROFS_BLKSIZ; 38 } 39 40 #ifdef CONFIG_EROFS_FS_XATTR 41 extern const struct xattr_handler erofs_xattr_user_handler; 42 extern const struct xattr_handler erofs_xattr_trusted_handler; 43 #ifdef CONFIG_EROFS_FS_SECURITY 44 extern const struct xattr_handler erofs_xattr_security_handler; 45 #endif 46 47 static inline const struct xattr_handler *erofs_xattr_handler(unsigned int idx) 48 { 49 static const struct xattr_handler *xattr_handler_map[] = { 50 [EROFS_XATTR_INDEX_USER] = &erofs_xattr_user_handler, 51 #ifdef CONFIG_EROFS_FS_POSIX_ACL 52 [EROFS_XATTR_INDEX_POSIX_ACL_ACCESS] = 53 &posix_acl_access_xattr_handler, 54 [EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT] = 55 &posix_acl_default_xattr_handler, 56 #endif 57 [EROFS_XATTR_INDEX_TRUSTED] = &erofs_xattr_trusted_handler, 58 #ifdef CONFIG_EROFS_FS_SECURITY 59 [EROFS_XATTR_INDEX_SECURITY] = &erofs_xattr_security_handler, 60 #endif 61 }; 62 63 return idx && idx < ARRAY_SIZE(xattr_handler_map) ? 64 xattr_handler_map[idx] : NULL; 65 } 66 67 extern const struct xattr_handler *erofs_xattr_handlers[]; 68 69 int erofs_getxattr(struct inode *, int, const char *, void *, size_t); 70 ssize_t erofs_listxattr(struct dentry *, char *, size_t); 71 #else 72 static inline int erofs_getxattr(struct inode *inode, int index, 73 const char *name, void *buffer, 74 size_t buffer_size) 75 { 76 return -EOPNOTSUPP; 77 } 78 79 #define erofs_listxattr (NULL) 80 #define erofs_xattr_handlers (NULL) 81 #endif /* !CONFIG_EROFS_FS_XATTR */ 82 83 #ifdef CONFIG_EROFS_FS_POSIX_ACL 84 struct posix_acl *erofs_get_acl(struct inode *inode, int type); 85 #else 86 #define erofs_get_acl (NULL) 87 #endif 88 89 #endif 90 91