dev.c 1.6 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * (C) Copyright 2011 - 2012 Samsung Electronics
  4. * EXT4 filesystem implementation in Uboot by
  5. * Uma Shankar <uma.shankar@samsung.com>
  6. * Manjunatha C Achar <a.manjunatha@samsung.com>
  7. *
  8. * made from existing ext2/dev.c file of Uboot
  9. * (C) Copyright 2004
  10. * esd gmbh <www.esd-electronics.com>
  11. * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
  12. *
  13. * based on code of fs/reiserfs/dev.c by
  14. *
  15. * (C) Copyright 2003 - 2004
  16. * Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
  17. */
  18. /*
  19. * Changelog:
  20. * 0.1 - Newly created file for ext4fs support. Taken from
  21. * fs/ext2/dev.c file in uboot.
  22. */
  23. #include <common.h>
  24. #include <blk.h>
  25. #include <config.h>
  26. #include <fs_internal.h>
  27. #include <ext4fs.h>
  28. #include <ext_common.h>
  29. #include "ext4_common.h"
  30. #include <log.h>
  31. lbaint_t part_offset;
  32. static struct blk_desc *ext4fs_blk_desc;
  33. static struct disk_partition *part_info;
  34. void ext4fs_set_blk_dev(struct blk_desc *rbdd, struct disk_partition *info)
  35. {
  36. assert(rbdd->blksz == (1 << rbdd->log2blksz));
  37. ext4fs_blk_desc = rbdd;
  38. get_fs()->dev_desc = rbdd;
  39. part_info = info;
  40. part_offset = info->start;
  41. get_fs()->total_sect = ((uint64_t)info->size * info->blksz) >>
  42. get_fs()->dev_desc->log2blksz;
  43. }
  44. int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len,
  45. char *buffer)
  46. {
  47. return fs_devread(get_fs()->dev_desc, part_info, sector, byte_offset,
  48. byte_len, buffer);
  49. }
  50. int ext4_read_superblock(char *buffer)
  51. {
  52. struct ext_filesystem *fs = get_fs();
  53. int sect = SUPERBLOCK_START >> fs->dev_desc->log2blksz;
  54. int off = SUPERBLOCK_START % fs->dev_desc->blksz;
  55. return ext4fs_devread(sect, off, SUPERBLOCK_SIZE,
  56. buffer);
  57. }