fs/erofs/xattr.h

   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 #ifdef CONFIG_EROFS_FS_XATTR
  17 extern const struct xattr_handler erofs_xattr_user_handler;
  18 extern const struct xattr_handler erofs_xattr_trusted_handler;
  19 extern const struct xattr_handler erofs_xattr_security_handler;
  20
  21 static inline const char *erofs_xattr_prefix(unsigned int idx,
  22                                              struct dentry *dentry)
  23 {
  24         const struct xattr_handler *handler = NULL;
  25
  26         static const struct xattr_handler * const xattr_handler_map[] = {
  27                 [EROFS_XATTR_INDEX_USER] = &erofs_xattr_user_handler,
  28 #ifdef CONFIG_EROFS_FS_POSIX_ACL
  29                 [EROFS_XATTR_INDEX_POSIX_ACL_ACCESS] = &nop_posix_acl_access,
  30                 [EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &nop_posix_acl_default,
  31 #endif
  32                 [EROFS_XATTR_INDEX_TRUSTED] = &erofs_xattr_trusted_handler,
  33 #ifdef CONFIG_EROFS_FS_SECURITY
  34                 [EROFS_XATTR_INDEX_SECURITY] = &erofs_xattr_security_handler,
  35 #endif
  36         };
  37
  38         if (idx && idx < ARRAY_SIZE(xattr_handler_map))
  39                 handler = xattr_handler_map[idx];
  40
  41         if (!xattr_handler_can_list(handler, dentry))
  42                 return NULL;
  43
  44         return xattr_prefix(handler);
  45 }
  46
  47 extern const struct xattr_handler * const erofs_xattr_handlers[];
  48
  49 int erofs_xattr_prefixes_init(struct super_block *sb);
  50 void erofs_xattr_prefixes_cleanup(struct super_block *sb);
  51 int erofs_getxattr(struct inode *, int, const char *, void *, size_t);
  52 ssize_t erofs_listxattr(struct dentry *, char *, size_t);
  53 #else
  54 static inline int erofs_xattr_prefixes_init(struct super_block *sb) { return 0; }
  55 static inline void erofs_xattr_prefixes_cleanup(struct super_block *sb) {}
  56 static inline int erofs_getxattr(struct inode *inode, int index,
  57                                  const char *name, void *buffer,
  58                                  size_t buffer_size)
  59 {
  60         return -EOPNOTSUPP;
  61 }
  62
  63 #define erofs_listxattr (NULL)
  64 #define erofs_xattr_handlers (NULL)
  65 #endif  /* !CONFIG_EROFS_FS_XATTR */
  66
  67 #ifdef CONFIG_EROFS_FS_POSIX_ACL
  68 struct posix_acl *erofs_get_acl(struct inode *inode, int type, bool rcu);
  69 #else
  70 #define erofs_get_acl   (NULL)
  71 #endif
  72
  73 #endif