ext2_fs.h 967 B

12345678910111213141516171819202122232425262728293031323334353637383940414243
  1. /* SPDX-License-Identifier: GPL-2.0 */
  2. /*
  3. * linux/include/linux/ext2_fs.h
  4. *
  5. * Copyright (C) 1992, 1993, 1994, 1995
  6. * Remy Card (card@masi.ibp.fr)
  7. * Laboratoire MASI - Institut Blaise Pascal
  8. * Universite Pierre et Marie Curie (Paris VI)
  9. *
  10. * from
  11. *
  12. * linux/include/linux/minix_fs.h
  13. *
  14. * Copyright (C) 1991, 1992 Linus Torvalds
  15. */
  16. #ifndef _LINUX_EXT2_FS_H
  17. #define _LINUX_EXT2_FS_H
  18. #include <linux/types.h>
  19. #include <linux/magic.h>
  20. #define EXT2_NAME_LEN 255
  21. /*
  22. * Maximal count of links to a file
  23. */
  24. #define EXT2_LINK_MAX 32000
  25. #define EXT2_SB_MAGIC_OFFSET 0x38
  26. #define EXT2_SB_BLOCKS_OFFSET 0x04
  27. #define EXT2_SB_BSIZE_OFFSET 0x18
  28. static inline u64 ext2_image_size(void *ext2_sb)
  29. {
  30. __u8 *p = ext2_sb;
  31. if (*(__le16 *)(p + EXT2_SB_MAGIC_OFFSET) != cpu_to_le16(EXT2_SUPER_MAGIC))
  32. return 0;
  33. return (u64)le32_to_cpup((__le32 *)(p + EXT2_SB_BLOCKS_OFFSET)) <<
  34. le32_to_cpup((__le32 *)(p + EXT2_SB_BSIZE_OFFSET));
  35. }
  36. #endif /* _LINUX_EXT2_FS_H */