fs/erofs/xattr.h

   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 static inline ssize_t erofs_listxattr(struct dentry *dentry,
  80                                       char *buffer, size_t buffer_size)
  81 {
  82         return -EOPNOTSUPP;
  83 }
  84 #endif  /* !CONFIG_EROFS_FS_XATTR */
  85
  86 #ifdef CONFIG_EROFS_FS_POSIX_ACL
  87 struct posix_acl *erofs_get_acl(struct inode *inode, int type);
  88 #else
  89 #define erofs_get_acl   (NULL)
  90 #endif
  91
  92 #endif
  93