drivers/staging/erofs/xattr.h

   1 /* SPDX-License-Identifier: GPL-2.0
   2  *
   3  * linux/drivers/staging/erofs/xattr.h
   4  *
   5  * Copyright (C) 2017-2018 HUAWEI, Inc.
   6  *             http://www.huawei.com/
   7  * Created by Gao Xiang <gaoxiang25@huawei.com>
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file COPYING in the main directory of the Linux
  11  * distribution for more details.
  12  */
  13 #ifndef __EROFS_XATTR_H
  14 #define __EROFS_XATTR_H
  15
  16 #include "internal.h"
  17 #include <linux/posix_acl_xattr.h>
  18 #include <linux/xattr.h>
  19
  20 /* Attribute not found */
  21 #define ENOATTR         ENODATA
  22
  23 static inline unsigned inlinexattr_header_size(struct inode *inode)
  24 {
  25         return sizeof(struct erofs_xattr_ibody_header)
  26                 + sizeof(u32) * EROFS_V(inode)->xattr_shared_count;
  27 }
  28
  29 static inline erofs_blk_t
  30 xattrblock_addr(struct erofs_sb_info *sbi, unsigned xattr_id)
  31 {
  32 #ifdef CONFIG_EROFS_FS_XATTR
  33         return sbi->xattr_blkaddr +
  34                 xattr_id * sizeof(__u32) / EROFS_BLKSIZ;
  35 #else
  36         return 0;
  37 #endif
  38 }
  39
  40 static inline unsigned
  41 xattrblock_offset(struct erofs_sb_info *sbi, unsigned xattr_id)
  42 {
  43         return (xattr_id * sizeof(__u32)) % EROFS_BLKSIZ;
  44 }
  45
  46 extern const struct xattr_handler erofs_xattr_user_handler;
  47 extern const struct xattr_handler erofs_xattr_trusted_handler;
  48 #ifdef CONFIG_EROFS_FS_SECURITY
  49 extern const struct xattr_handler erofs_xattr_security_handler;
  50 #endif
  51
  52 static inline const struct xattr_handler *erofs_xattr_handler(unsigned index)
  53 {
  54 static const struct xattr_handler *xattr_handler_map[] = {
  55         [EROFS_XATTR_INDEX_USER] = &erofs_xattr_user_handler,
  56 #ifdef CONFIG_EROFS_FS_POSIX_ACL
  57         [EROFS_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler,
  58         [EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT] =
  59                 &posix_acl_default_xattr_handler,
  60 #endif
  61         [EROFS_XATTR_INDEX_TRUSTED] = &erofs_xattr_trusted_handler,
  62 #ifdef CONFIG_EROFS_FS_SECURITY
  63         [EROFS_XATTR_INDEX_SECURITY] = &erofs_xattr_security_handler,
  64 #endif
  65 };
  66         return index && index < ARRAY_SIZE(xattr_handler_map) ?
  67                 xattr_handler_map[index] : NULL;
  68 }
  69
  70 #ifdef CONFIG_EROFS_FS_XATTR
  71
  72 extern const struct inode_operations erofs_generic_xattr_iops;
  73 extern const struct inode_operations erofs_dir_xattr_iops;
  74
  75 int erofs_getxattr(struct inode *, int, const char *, void *, size_t);
  76 ssize_t erofs_listxattr(struct dentry *, char *, size_t);
  77 #else
  78 static int __maybe_unused erofs_getxattr(struct inode *inode, int index,
  79         const char *name,
  80         void *buffer, size_t buffer_size)
  81 {
  82         return -ENOTSUPP;
  83 }
  84
  85 static ssize_t __maybe_unused erofs_listxattr(struct dentry *dentry,
  86         char *buffer, size_t buffer_size)
  87 {
  88         return -ENOTSUPP;
  89 }
  90 #endif
  91
  92 #endif
  93