fs/romfs/internal.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /* RomFS internal definitions
   3  *
   4  * Copyright © 2007 Red Hat, Inc. All Rights Reserved.
   5  * Written by David Howells (dhowells@redhat.com)
   6  */
   7
   8 #include <linux/romfs_fs.h>
   9
  10 struct romfs_inode_info {
  11         struct inode    vfs_inode;
  12         unsigned long   i_metasize;     /* size of non-data area */
  13         unsigned long   i_dataoffset;   /* from the start of fs */
  14 };
  15
  16 static inline size_t romfs_maxsize(struct super_block *sb)
  17 {
  18         return (size_t) (unsigned long) sb->s_fs_info;
  19 }
  20
  21 static inline struct romfs_inode_info *ROMFS_I(struct inode *inode)
  22 {
  23         return container_of(inode, struct romfs_inode_info, vfs_inode);
  24 }
  25
  26 /*
  27  * mmap-nommu.c
  28  */
  29 #if !defined(CONFIG_MMU) && defined(CONFIG_ROMFS_ON_MTD)
  30 extern const struct file_operations romfs_ro_fops;
  31 #else
  32 #define romfs_ro_fops   generic_ro_fops
  33 #endif
  34
  35 /*
  36  * storage.c
  37  */
  38 extern int romfs_dev_read(struct super_block *sb, unsigned long pos,
  39                           void *buf, size_t buflen);
  40 extern ssize_t romfs_dev_strnlen(struct super_block *sb,
  41                                  unsigned long pos, size_t maxlen);
  42 extern int romfs_dev_strcmp(struct super_block *sb, unsigned long pos,
  43                             const char *str, size_t size);