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); 48