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] = &posix_acl_access_xattr_handler, 53 [EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT] = 54 &posix_acl_default_xattr_handler, 55 #endif 56 [EROFS_XATTR_INDEX_TRUSTED] = &erofs_xattr_trusted_handler, 57 #ifdef CONFIG_EROFS_FS_SECURITY 58 [EROFS_XATTR_INDEX_SECURITY] = &erofs_xattr_security_handler, 59 #endif 60 }; 61 62 return idx && idx < ARRAY_SIZE(xattr_handler_map) ? 63 xattr_handler_map[idx] : NULL; 64 } 65 66 extern const struct xattr_handler *erofs_xattr_handlers[]; 67 68 int erofs_getxattr(struct inode *, int, const char *, void *, size_t); 69 ssize_t erofs_listxattr(struct dentry *, char *, size_t); 70 #else 71 static inline int erofs_getxattr(struct inode *inode, int index, 72 const char *name, void *buffer, 73 size_t buffer_size) 74 { 75 return -EOPNOTSUPP; 76 } 77 78 static inline ssize_t erofs_listxattr(struct dentry *dentry, 79 char *buffer, size_t buffer_size) 80 { 81 return -EOPNOTSUPP; 82 } 83 #endif /* !CONFIG_EROFS_FS_XATTR */ 84 85 #ifdef CONFIG_EROFS_FS_POSIX_ACL 86 struct posix_acl *erofs_get_acl(struct inode *inode, int type); 87 #else 88 #define erofs_get_acl (NULL) 89 #endif 90 91 #endif 92 93