ext4fs.h 4.5 KB

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  1. /*
  2. * (C) Copyright 2011 - 2012 Samsung Electronics
  3. * EXT4 filesystem implementation in Uboot by
  4. * Uma Shankar <uma.shankar@samsung.com>
  5. * Manjunatha C Achar <a.manjunatha@samsung.com>
  6. *
  7. * Ext4 Extent data structures are taken from original ext4 fs code
  8. * as found in the linux kernel.
  9. *
  10. * Copyright (c) 2003-2006, Cluster File Systems, Inc, info@clusterfs.com
  11. * Written by Alex Tomas <alex@clusterfs.com>
  12. *
  13. * This program is free software; you can redistribute it and/or modify
  14. * it under the terms of the GNU General Public License version 2 as
  15. * published by the Free Software Foundation.
  16. *
  17. * This program is distributed in the hope that it will be useful,
  18. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  20. * GNU General Public License for more details.
  21. *
  22. * You should have received a copy of the GNU General Public License
  23. * along with this program; if not, write to the Free Software
  24. * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25. */
  26. #ifndef __EXT4__
  27. #define __EXT4__
  28. #include <ext_common.h>
  29. #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
  30. #define EXT4_EXT_MAGIC 0xf30a
  31. #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
  32. #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040
  33. #define EXT4_INDIRECT_BLOCKS 12
  34. #define EXT4_BG_INODE_UNINIT 0x0001
  35. #define EXT4_BG_BLOCK_UNINIT 0x0002
  36. #define EXT4_BG_INODE_ZEROED 0x0004
  37. /*
  38. * ext4_inode has i_block array (60 bytes total).
  39. * The first 12 bytes store ext4_extent_header;
  40. * the remainder stores an array of ext4_extent.
  41. */
  42. /*
  43. * This is the extent on-disk structure.
  44. * It's used at the bottom of the tree.
  45. */
  46. struct ext4_extent {
  47. __le32 ee_block; /* first logical block extent covers */
  48. __le16 ee_len; /* number of blocks covered by extent */
  49. __le16 ee_start_hi; /* high 16 bits of physical block */
  50. __le32 ee_start_lo; /* low 32 bits of physical block */
  51. };
  52. /*
  53. * This is index on-disk structure.
  54. * It's used at all the levels except the bottom.
  55. */
  56. struct ext4_extent_idx {
  57. __le32 ei_block; /* index covers logical blocks from 'block' */
  58. __le32 ei_leaf_lo; /* pointer to the physical block of the next *
  59. * level. leaf or next index could be there */
  60. __le16 ei_leaf_hi; /* high 16 bits of physical block */
  61. __u16 ei_unused;
  62. };
  63. /* Each block (leaves and indexes), even inode-stored has header. */
  64. struct ext4_extent_header {
  65. __le16 eh_magic; /* probably will support different formats */
  66. __le16 eh_entries; /* number of valid entries */
  67. __le16 eh_max; /* capacity of store in entries */
  68. __le16 eh_depth; /* has tree real underlying blocks? */
  69. __le32 eh_generation; /* generation of the tree */
  70. };
  71. struct ext_filesystem {
  72. /* Total Sector of partition */
  73. uint64_t total_sect;
  74. /* Block size of partition */
  75. uint32_t blksz;
  76. /* Inode size of partition */
  77. uint32_t inodesz;
  78. /* Sectors per Block */
  79. uint32_t sect_perblk;
  80. /* Group Descriptor Block Number */
  81. uint32_t gdtable_blkno;
  82. /* Total block groups of partition */
  83. uint32_t no_blkgrp;
  84. /* No of blocks required for bgdtable */
  85. uint32_t no_blk_pergdt;
  86. /* Superblock */
  87. struct ext2_sblock *sb;
  88. /* Block group descritpor table */
  89. struct ext2_block_group *gd;
  90. char *gdtable;
  91. /* Block Bitmap Related */
  92. unsigned char **blk_bmaps;
  93. long int curr_blkno;
  94. uint16_t first_pass_bbmap;
  95. /* Inode Bitmap Related */
  96. unsigned char **inode_bmaps;
  97. int curr_inode_no;
  98. uint16_t first_pass_ibmap;
  99. /* Journal Related */
  100. /* Block Device Descriptor */
  101. block_dev_desc_t *dev_desc;
  102. };
  103. extern block_dev_desc_t *ext4_dev_desc;
  104. extern struct ext2_data *ext4fs_root;
  105. extern struct ext2fs_node *ext4fs_file;
  106. #if defined(CONFIG_CMD_EXT4_WRITE)
  107. extern struct ext2_inode *g_parent_inode;
  108. extern int gd_index;
  109. extern int gindex;
  110. int ext4fs_init(void);
  111. void ext4fs_deinit(void);
  112. int ext4fs_filename_check(char *filename);
  113. int ext4fs_write(const char *fname, unsigned char *buffer,
  114. unsigned long sizebytes);
  115. #endif
  116. struct ext_filesystem *get_fs(void);
  117. int init_fs(block_dev_desc_t *dev_desc);
  118. void deinit_fs(block_dev_desc_t *dev_desc);
  119. int ext4fs_open(const char *filename);
  120. int ext4fs_read(char *buf, unsigned len);
  121. int ext4fs_mount(unsigned part_length);
  122. void ext4fs_close(void);
  123. int ext4fs_ls(const char *dirname);
  124. void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot);
  125. int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf);
  126. int ext4fs_set_blk_dev(block_dev_desc_t *rbdd, int part);
  127. long int read_allocated_block(struct ext2_inode *inode, int fileblock);
  128. #endif