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 * This file is part of the Linux kernel and is made available under 15 * the terms of the GNU General Public License, version 2, or at your 16 * option, any later version, incorporated herein by reference. 17 * 18 * This program is free software; you can redistribute it and/or modify 19 * it under the terms of the GNU General Public License as published by 20 * the Free Software Foundation; either version 2 of the License, or 21 * (at your option) any later version. 22 * 23 * This program is distributed in the hope that it will be useful, 24 * but WITHOUT ANY WARRANTY; without even the implied warranty of 25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 26 * GNU General Public License for more details. 27 * 28 * You should have received a copy of the GNU General Public License 29 * along with this program; if not, write to the Free Software 30 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 31 */ 32 33 #ifndef __EXT4_JRNL__ 34 #define __EXT4_JRNL__ 35 36 #define EXT2_JOURNAL_INO 8 /* Journal inode */ 37 #define EXT2_JOURNAL_SUPERBLOCK 0 /* Journal Superblock number */ 38 39 #define JBD2_FEATURE_COMPAT_CHECKSUM 0x00000001 40 #define EXT3_JOURNAL_MAGIC_NUMBER 0xc03b3998U 41 #define TRANSACTION_RUNNING 1 42 #define TRANSACTION_COMPLETE 0 43 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 44 #define EXT3_JOURNAL_DESCRIPTOR_BLOCK 1 45 #define EXT3_JOURNAL_COMMIT_BLOCK 2 46 #define EXT3_JOURNAL_SUPERBLOCK_V1 3 47 #define EXT3_JOURNAL_SUPERBLOCK_V2 4 48 #define EXT3_JOURNAL_REVOKE_BLOCK 5 49 #define EXT3_JOURNAL_FLAG_ESCAPE 1 50 #define EXT3_JOURNAL_FLAG_SAME_UUID 2 51 #define EXT3_JOURNAL_FLAG_DELETED 4 52 #define EXT3_JOURNAL_FLAG_LAST_TAG 8 53 54 /* Maximum entries in 1 journal transaction */ 55 #define MAX_JOURNAL_ENTRIES 100 56 struct journal_log { 57 char *buf; 58 int blknr; 59 }; 60 61 struct dirty_blocks { 62 char *buf; 63 int blknr; 64 }; 65 66 /* Standard header for all descriptor blocks: */ 67 struct journal_header_t { 68 __u32 h_magic; 69 __u32 h_blocktype; 70 __u32 h_sequence; 71 }; 72 73 /* The journal superblock. All fields are in big-endian byte order. */ 74 struct journal_superblock_t { 75 /* 0x0000 */ 76 struct journal_header_t s_header; 77 78 /* Static information describing the journal */ 79 __u32 s_blocksize; /* journal device blocksize */ 80 __u32 s_maxlen; /* total blocks in journal file */ 81 __u32 s_first; /* first block of log information */ 82 83 /* Dynamic information describing the current state of the log */ 84 __u32 s_sequence; /* first commit ID expected in log */ 85 __u32 s_start; /* blocknr of start of log */ 86 87 /* Error value, as set by journal_abort(). */ 88 __s32 s_errno; 89 90 /* Remaining fields are only valid in a version-2 superblock */ 91 __u32 s_feature_compat; /* compatible feature set */ 92 __u32 s_feature_incompat; /* incompatible feature set */ 93 __u32 s_feature_ro_compat; /* readonly-compatible feature set */ 94 /* 0x0030 */ 95 __u8 s_uuid[16]; /* 128-bit uuid for journal */ 96 97 /* 0x0040 */ 98 __u32 s_nr_users; /* Nr of filesystems sharing log */ 99 100 __u32 s_dynsuper; /* Blocknr of dynamic superblock copy */ 101 102 /* 0x0048 */ 103 __u32 s_max_transaction; /* Limit of journal blocks per trans. */ 104 __u32 s_max_trans_data; /* Limit of data blocks per trans. */ 105 106 /* 0x0050 */ 107 __u32 s_padding[44]; 108 109 /* 0x0100 */ 110 __u8 s_users[16 * 48]; /* ids of all fs'es sharing the log */ 111 /* 0x0400 */ 112 } ; 113 114 struct ext3_journal_block_tag { 115 uint32_t block; 116 uint32_t flags; 117 }; 118 119 struct journal_revoke_header_t { 120 struct journal_header_t r_header; 121 int r_count; /* Count of bytes used in the block */ 122 }; 123 124 struct revoke_blk_list { 125 char *content; /* revoke block itself */ 126 struct revoke_blk_list *next; 127 }; 128 129 extern struct ext2_data *ext4fs_root; 130 131 int ext4fs_init_journal(void); 132 int ext4fs_log_gdt(char *gd_table); 133 int ext4fs_check_journal_state(int recovery_flag); 134 int ext4fs_log_journal(char *journal_buffer, long int blknr); 135 int ext4fs_put_metadata(char *metadata_buffer, long int blknr); 136 void ext4fs_update_journal(void); 137 void ext4fs_dump_metadata(void); 138 void ext4fs_push_revoke_blk(char *buffer); 139 void ext4fs_free_journal(void); 140 void ext4fs_free_revoke_blks(void); 141 #endif 142