1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2017-2018 HUAWEI, Inc. 4 * https://www.huawei.com/ 5 */ 6 #ifndef __EROFS_XATTR_H 7 #define __EROFS_XATTR_H 8 9 #include "internal.h" 10 #include <linux/posix_acl_xattr.h> 11 #include <linux/xattr.h> 12 13 /* Attribute not found */ 14 #define ENOATTR ENODATA 15 16 static inline unsigned int inlinexattr_header_size(struct inode *inode) 17 { 18 return sizeof(struct erofs_xattr_ibody_header) + 19 sizeof(u32) * EROFS_I(inode)->xattr_shared_count; 20 } 21 22 static inline erofs_blk_t xattrblock_addr(struct erofs_sb_info *sbi, 23 unsigned int xattr_id) 24 { 25 #ifdef CONFIG_EROFS_FS_XATTR 26 return sbi->xattr_blkaddr + 27 xattr_id * sizeof(__u32) / EROFS_BLKSIZ; 28 #else 29 return 0; 30 #endif 31 } 32 33 static inline unsigned int xattrblock_offset(struct erofs_sb_info *sbi, 34 unsigned int xattr_id) 35 { 36 return (xattr_id * sizeof(__u32)) % EROFS_BLKSIZ; 37 } 38 39 #ifdef CONFIG_EROFS_FS_XATTR 40 extern const struct xattr_handler erofs_xattr_user_handler; 41 extern const struct xattr_handler erofs_xattr_trusted_handler; 42 #ifdef CONFIG_EROFS_FS_SECURITY 43 extern const struct xattr_handler erofs_xattr_security_handler; 44 #endif 45 46 static inline const struct xattr_handler *erofs_xattr_handler(unsigned int idx) 47 { 48 static const struct xattr_handler *xattr_handler_map[] = { 49 [EROFS_XATTR_INDEX_USER] = &erofs_xattr_user_handler, 50 #ifdef CONFIG_EROFS_FS_POSIX_ACL 51 [EROFS_XATTR_INDEX_POSIX_ACL_ACCESS] = 52 &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 #define erofs_listxattr (NULL) 79 #define erofs_xattr_handlers (NULL) 80 #endif /* !CONFIG_EROFS_FS_XATTR */ 81 82 #ifdef CONFIG_EROFS_FS_POSIX_ACL 83 struct posix_acl *erofs_get_acl(struct inode *inode, int type, bool rcu); 84 #else 85 #define erofs_get_acl (NULL) 86 #endif 87 88 #endif 89 90