LXR uboot/fs/ext4/ext4

   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 * Journal data structures and headers for Journaling feature of ext4
   8 * have been referred from JBD2 (Journaling Block device 2)
   9 * implementation in Linux Kernel.
  10 *
  11 * Written by Stephen C. Tweedie <sct@redhat.com>
  12 *
  13 * Copyright 1998-2000 Red Hat, Inc --- All Rights Reserved
  14 * SPDX-License-Identifier:     GPL-2.0+
  15 */
  16
  17#ifndef __EXT4_JRNL__
  18#define __EXT4_JRNL__
  19
  20#define EXT2_JOURNAL_INO                8       /* Journal inode */
  21#define EXT2_JOURNAL_SUPERBLOCK 0       /* Journal  Superblock number */
  22
  23#define JBD2_FEATURE_COMPAT_CHECKSUM    0x00000001
  24#define EXT3_JOURNAL_MAGIC_NUMBER       0xc03b3998U
  25#define TRANSACTION_RUNNING             1
  26#define TRANSACTION_COMPLETE            0
  27#define EXT3_FEATURE_INCOMPAT_RECOVER   0x0004  /* Needs recovery */
  28#define EXT3_JOURNAL_DESCRIPTOR_BLOCK   1
  29#define EXT3_JOURNAL_COMMIT_BLOCK       2
  30#define EXT3_JOURNAL_SUPERBLOCK_V1      3
  31#define EXT3_JOURNAL_SUPERBLOCK_V2      4
  32#define EXT3_JOURNAL_REVOKE_BLOCK       5
  33#define EXT3_JOURNAL_FLAG_ESCAPE        1
  34#define EXT3_JOURNAL_FLAG_SAME_UUID     2
  35#define EXT3_JOURNAL_FLAG_DELETED       4
  36#define EXT3_JOURNAL_FLAG_LAST_TAG      8
  37
  38/* Maximum entries in 1 journal transaction */
  39#define MAX_JOURNAL_ENTRIES 100
  40struct journal_log {
  41        char *buf;
  42        int blknr;
  43};
  44
  45struct dirty_blocks {
  46        char *buf;
  47        int blknr;
  48};
  49
  50/* Standard header for all descriptor blocks: */
  51struct journal_header_t {
  52        __u32 h_magic;
  53        __u32 h_blocktype;
  54        __u32 h_sequence;
  55};
  56
  57/* The journal superblock.  All fields are in big-endian byte order. */
  58struct journal_superblock_t {
  59        /* 0x0000 */
  60        struct journal_header_t s_header;
  61
  62        /* Static information describing the journal */
  63        __u32 s_blocksize;      /* journal device blocksize */
  64        __u32 s_maxlen;         /* total blocks in journal file */
  65        __u32 s_first;          /* first block of log information */
  66
  67        /* Dynamic information describing the current state of the log */
  68        __u32 s_sequence;       /* first commit ID expected in log */
  69        __u32 s_start;          /* blocknr of start of log */
  70
  71        /* Error value, as set by journal_abort(). */
  72        __s32 s_errno;
  73
  74        /* Remaining fields are only valid in a version-2 superblock */
  75        __u32 s_feature_compat; /* compatible feature set */
  76        __u32 s_feature_incompat;       /* incompatible feature set */
  77        __u32 s_feature_ro_compat;      /* readonly-compatible feature set */
  78        /* 0x0030 */
  79        __u8 s_uuid[16];        /* 128-bit uuid for journal */
  80
  81        /* 0x0040 */
  82        __u32 s_nr_users;       /* Nr of filesystems sharing log */
  83
  84        __u32 s_dynsuper;       /* Blocknr of dynamic superblock copy */
  85
  86        /* 0x0048 */
  87        __u32 s_max_transaction;        /* Limit of journal blocks per trans. */
  88        __u32 s_max_trans_data; /* Limit of data blocks per trans. */
  89
  90        /* 0x0050 */
  91        __u32 s_padding[44];
  92
  93        /* 0x0100 */
  94        __u8 s_users[16 * 48];  /* ids of all fs'es sharing the log */
  95        /* 0x0400 */
  96} ;
  97
  98struct ext3_journal_block_tag {
  99        uint32_t block;
 100        uint32_t flags;
 101};
 102
 103struct journal_revoke_header_t {
 104        struct journal_header_t r_header;
 105        int r_count;            /* Count of bytes used in the block */
 106};
 107
 108struct revoke_blk_list {
 109        char *content;          /* revoke block itself */
 110        struct revoke_blk_list *next;
 111};
 112
 113extern struct ext2_data *ext4fs_root;
 114
 115int ext4fs_init_journal(void);
 116int ext4fs_log_gdt(char *gd_table);
 117int ext4fs_check_journal_state(int recovery_flag);
 118int ext4fs_log_journal(char *journal_buffer, long int blknr);
 119int ext4fs_put_metadata(char *metadata_buffer, long int blknr);
 120void ext4fs_update_journal(void);
 121void ext4fs_dump_metadata(void);
 122void ext4fs_push_revoke_blk(char *buffer);
 123void ext4fs_free_journal(void);
 124void ext4fs_free_revoke_blks(void);
 125#endif
 126