3
0

f2fs.c 3.6 KB

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192
  1. /*
  2. * volume_id - reads filesystem label and uuid
  3. *
  4. * Copyright (C) 2012 S-G Bergh <sgb@systemasis.org>
  5. *
  6. * Licensed under GPLv2, see file LICENSE in this source tree.
  7. */
  8. //config:config FEATURE_VOLUMEID_F2FS
  9. //config: bool "f2fs filesystem"
  10. //config: default y
  11. //config: depends on VOLUMEID
  12. //config: help
  13. //config: F2FS (aka Flash-Friendly File System) is a log-structured file system,
  14. //config: which is adapted to newer forms of storage. F2FS also remedies some
  15. //config: known issues of the older log structured file systems, such as high
  16. //config: cleaning overhead.
  17. //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_F2FS) += f2fs.o
  18. #include "volume_id_internal.h"
  19. #define F2FS_MAGIC 0xF2F52010 // F2FS Magic Number
  20. #define F2FS_UUID_SIZE 16
  21. #define F2FS_LABEL_SIZE 512
  22. #define F2FS_LABEL_BYTES 1024
  23. #define F2FS_SB1_OFFSET 0x400 // offset for 1:st super block
  24. /*
  25. #define F2FS_SB2_OFFSET 0x1400 // offset for 2:nd super block
  26. */
  27. struct f2fs_super_block { // According to version 1.1
  28. /* 0x00 */ uint32_t magic; // Magic Number
  29. /* 0x04 */ uint16_t major_ver; // Major Version
  30. /* 0x06 */ uint16_t minor_ver; // Minor Version
  31. /* 0x08 */ uint32_t log_sectorsize; // log2 sector size in bytes
  32. /* 0x0C */ uint32_t log_sectors_per_block; // log2 # of sectors per block
  33. /* 0x10 */ uint32_t log_blocksize; // log2 block size in bytes
  34. /* 0x14 */ uint32_t log_blocks_per_seg; // log2 # of blocks per segment
  35. /* 0x18 */ uint32_t segs_per_sec; // # of segments per section
  36. /* 0x1C */ uint32_t secs_per_zone; // # of sections per zone
  37. /* 0x20 */ uint32_t checksum_offset; // checksum offset inside super block
  38. /* 0x24 */ uint64_t block_count; // total # of user blocks
  39. /* 0x2C */ uint32_t section_count; // total # of sections
  40. /* 0x30 */ uint32_t segment_count; // total # of segments
  41. /* 0x34 */ uint32_t segment_count_ckpt; // # of segments for checkpoint
  42. /* 0x38 */ uint32_t segment_count_sit; // # of segments for SIT
  43. /* 0x3C */ uint32_t segment_count_nat; // # of segments for NAT
  44. /* 0x40 */ uint32_t segment_count_ssa; // # of segments for SSA
  45. /* 0x44 */ uint32_t segment_count_main; // # of segments for main area
  46. /* 0x48 */ uint32_t segment0_blkaddr; // start block address of segment 0
  47. /* 0x4C */ uint32_t cp_blkaddr; // start block address of checkpoint
  48. /* 0x50 */ uint32_t sit_blkaddr; // start block address of SIT
  49. /* 0x54 */ uint32_t nat_blkaddr; // start block address of NAT
  50. /* 0x58 */ uint32_t ssa_blkaddr; // start block address of SSA
  51. /* 0x5C */ uint32_t main_blkaddr; // start block address of main area
  52. /* 0x60 */ uint32_t root_ino; // root inode number
  53. /* 0x64 */ uint32_t node_ino; // node inode number
  54. /* 0x68 */ uint32_t meta_ino; // meta inode number
  55. /* 0x6C */ uint8_t uuid[F2FS_UUID_SIZE]; // 128-bit uuid for volume
  56. /* 0x7C */ uint16_t volume_name[F2FS_LABEL_SIZE]; // volume name
  57. // /* 0x47C */ uint32_t extension_count; // # of extensions below
  58. // /* 0x480 */ uint8_t extension_list[64][8]; // extension array
  59. } PACKED;
  60. int FAST_FUNC volume_id_probe_f2fs(struct volume_id *id /*,uint64_t off*/)
  61. {
  62. struct f2fs_super_block *sb;
  63. // Go for primary super block (ignore second sb)
  64. dbg("f2fs: probing at offset 0x%x", F2FS_SB1_OFFSET);
  65. sb = volume_id_get_buffer(id, F2FS_SB1_OFFSET, sizeof(*sb));
  66. if (!sb)
  67. return -1;
  68. if (sb->magic != cpu_to_le32(F2FS_MAGIC))
  69. return -1;
  70. IF_FEATURE_BLKID_TYPE(id->type = "f2fs");
  71. // For version 1.0 we don't know sb structure and can't set label/uuid
  72. if (sb->major_ver == cpu_to_le16(1) && sb->minor_ver == cpu_to_le16(0))
  73. return 0;
  74. volume_id_set_label_unicode16(id, (uint8_t *)sb->volume_name,
  75. LE, MIN(F2FS_LABEL_BYTES, VOLUME_ID_LABEL_SIZE));
  76. volume_id_set_uuid(id, sb->uuid, UUID_DCE);
  77. return 0;
  78. }