fs/romfs/internal.h

   1 /* RomFS internal definitions
   2  *
   3  * Copyright © 2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/romfs_fs.h>
  13
  14 struct romfs_inode_info {
  15         struct inode    vfs_inode;
  16         unsigned long   i_metasize;     /* size of non-data area */
  17         unsigned long   i_dataoffset;   /* from the start of fs */
  18 };
  19
  20 static inline size_t romfs_maxsize(struct super_block *sb)
  21 {
  22         return (size_t) (unsigned long) sb->s_fs_info;
  23 }
  24
  25 static inline struct romfs_inode_info *ROMFS_I(struct inode *inode)
  26 {
  27         return container_of(inode, struct romfs_inode_info, vfs_inode);
  28 }
  29
  30 /*
  31  * mmap-nommu.c
  32  */
  33 #if !defined(CONFIG_MMU) && defined(CONFIG_ROMFS_ON_MTD)
  34 extern const struct file_operations romfs_ro_fops;
  35 #else
  36 #define romfs_ro_fops   generic_ro_fops
  37 #endif
  38
  39 /*
  40  * storage.c
  41  */
  42 extern int romfs_dev_read(struct super_block *sb, unsigned long pos,
  43                           void *buf, size_t buflen);
  44 extern ssize_t romfs_dev_strnlen(struct super_block *sb,
  45                                  unsigned long pos, size_t maxlen);
  46 extern int romfs_dev_strcmp(struct super_block *sb, unsigned long pos,
  47                             const char *str, size_t size);