1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * (C) Copyright 2011 - 2012 Samsung Electronics 3*4882a593Smuzhiyun * EXT4 filesystem implementation in Uboot by 4*4882a593Smuzhiyun * Uma Shankar <uma.shankar@samsung.com> 5*4882a593Smuzhiyun * Manjunatha C Achar <a.manjunatha@samsung.com> 6*4882a593Smuzhiyun * 7*4882a593Smuzhiyun * Journal data structures and headers for Journaling feature of ext4 8*4882a593Smuzhiyun * have been referred from JBD2 (Journaling Block device 2) 9*4882a593Smuzhiyun * implementation in Linux Kernel. 10*4882a593Smuzhiyun * 11*4882a593Smuzhiyun * Written by Stephen C. Tweedie <sct@redhat.com> 12*4882a593Smuzhiyun * 13*4882a593Smuzhiyun * Copyright 1998-2000 Red Hat, Inc --- All Rights Reserved 14*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+ 15*4882a593Smuzhiyun */ 16*4882a593Smuzhiyun 17*4882a593Smuzhiyun #ifndef __EXT4_JRNL__ 18*4882a593Smuzhiyun #define __EXT4_JRNL__ 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun #define EXT2_JOURNAL_INO 8 /* Journal inode */ 21*4882a593Smuzhiyun #define EXT2_JOURNAL_SUPERBLOCK 0 /* Journal Superblock number */ 22*4882a593Smuzhiyun 23*4882a593Smuzhiyun #define JBD2_FEATURE_COMPAT_CHECKSUM 0x00000001 24*4882a593Smuzhiyun #define EXT3_JOURNAL_MAGIC_NUMBER 0xc03b3998U 25*4882a593Smuzhiyun #define TRANSACTION_RUNNING 1 26*4882a593Smuzhiyun #define TRANSACTION_COMPLETE 0 27*4882a593Smuzhiyun #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 28*4882a593Smuzhiyun #define EXT3_JOURNAL_DESCRIPTOR_BLOCK 1 29*4882a593Smuzhiyun #define EXT3_JOURNAL_COMMIT_BLOCK 2 30*4882a593Smuzhiyun #define EXT3_JOURNAL_SUPERBLOCK_V1 3 31*4882a593Smuzhiyun #define EXT3_JOURNAL_SUPERBLOCK_V2 4 32*4882a593Smuzhiyun #define EXT3_JOURNAL_REVOKE_BLOCK 5 33*4882a593Smuzhiyun #define EXT3_JOURNAL_FLAG_ESCAPE 1 34*4882a593Smuzhiyun #define EXT3_JOURNAL_FLAG_SAME_UUID 2 35*4882a593Smuzhiyun #define EXT3_JOURNAL_FLAG_DELETED 4 36*4882a593Smuzhiyun #define EXT3_JOURNAL_FLAG_LAST_TAG 8 37*4882a593Smuzhiyun 38*4882a593Smuzhiyun /* Maximum entries in 1 journal transaction */ 39*4882a593Smuzhiyun #define MAX_JOURNAL_ENTRIES 100 40*4882a593Smuzhiyun struct journal_log { 41*4882a593Smuzhiyun char *buf; 42*4882a593Smuzhiyun int blknr; 43*4882a593Smuzhiyun }; 44*4882a593Smuzhiyun 45*4882a593Smuzhiyun struct dirty_blocks { 46*4882a593Smuzhiyun char *buf; 47*4882a593Smuzhiyun int blknr; 48*4882a593Smuzhiyun }; 49*4882a593Smuzhiyun 50*4882a593Smuzhiyun /* Standard header for all descriptor blocks: */ 51*4882a593Smuzhiyun struct journal_header_t { 52*4882a593Smuzhiyun __be32 h_magic; 53*4882a593Smuzhiyun __be32 h_blocktype; 54*4882a593Smuzhiyun __be32 h_sequence; 55*4882a593Smuzhiyun }; 56*4882a593Smuzhiyun 57*4882a593Smuzhiyun /* The journal superblock. All fields are in big-endian byte order. */ 58*4882a593Smuzhiyun struct journal_superblock_t { 59*4882a593Smuzhiyun /* 0x0000 */ 60*4882a593Smuzhiyun struct journal_header_t s_header; 61*4882a593Smuzhiyun 62*4882a593Smuzhiyun /* Static information describing the journal */ 63*4882a593Smuzhiyun __be32 s_blocksize; /* journal device blocksize */ 64*4882a593Smuzhiyun __be32 s_maxlen; /* total blocks in journal file */ 65*4882a593Smuzhiyun __be32 s_first; /* first block of log information */ 66*4882a593Smuzhiyun 67*4882a593Smuzhiyun /* Dynamic information describing the current state of the log */ 68*4882a593Smuzhiyun __be32 s_sequence; /* first commit ID expected in log */ 69*4882a593Smuzhiyun __be32 s_start; /* blocknr of start of log */ 70*4882a593Smuzhiyun 71*4882a593Smuzhiyun /* Error value, as set by journal_abort(). */ 72*4882a593Smuzhiyun __be32 s_errno; 73*4882a593Smuzhiyun 74*4882a593Smuzhiyun /* Remaining fields are only valid in a version-2 superblock */ 75*4882a593Smuzhiyun __be32 s_feature_compat; /* compatible feature set */ 76*4882a593Smuzhiyun __be32 s_feature_incompat; /* incompatible feature set */ 77*4882a593Smuzhiyun __be32 s_feature_ro_compat; /* readonly-compatible feature set */ 78*4882a593Smuzhiyun /* 0x0030 */ 79*4882a593Smuzhiyun __u8 s_uuid[16]; /* 128-bit uuid for journal */ 80*4882a593Smuzhiyun 81*4882a593Smuzhiyun /* 0x0040 */ 82*4882a593Smuzhiyun __be32 s_nr_users; /* Nr of filesystems sharing log */ 83*4882a593Smuzhiyun 84*4882a593Smuzhiyun __be32 s_dynsuper; /* Blocknr of dynamic superblock copy */ 85*4882a593Smuzhiyun 86*4882a593Smuzhiyun /* 0x0048 */ 87*4882a593Smuzhiyun __be32 s_max_transaction; /* Limit of journal blocks per trans. */ 88*4882a593Smuzhiyun __be32 s_max_trans_data; /* Limit of data blocks per trans. */ 89*4882a593Smuzhiyun 90*4882a593Smuzhiyun /* 0x0050 */ 91*4882a593Smuzhiyun __be32 s_padding[44]; 92*4882a593Smuzhiyun 93*4882a593Smuzhiyun /* 0x0100 */ 94*4882a593Smuzhiyun __u8 s_users[16 * 48]; /* ids of all fs'es sharing the log */ 95*4882a593Smuzhiyun /* 0x0400 */ 96*4882a593Smuzhiyun } ; 97*4882a593Smuzhiyun 98*4882a593Smuzhiyun struct ext3_journal_block_tag { 99*4882a593Smuzhiyun __be32 block; 100*4882a593Smuzhiyun __be32 flags; 101*4882a593Smuzhiyun }; 102*4882a593Smuzhiyun 103*4882a593Smuzhiyun struct journal_revoke_header_t { 104*4882a593Smuzhiyun struct journal_header_t r_header; 105*4882a593Smuzhiyun __be32 r_count; /* Count of bytes used in the block */ 106*4882a593Smuzhiyun }; 107*4882a593Smuzhiyun 108*4882a593Smuzhiyun struct revoke_blk_list { 109*4882a593Smuzhiyun char *content; /* revoke block itself */ 110*4882a593Smuzhiyun struct revoke_blk_list *next; 111*4882a593Smuzhiyun }; 112*4882a593Smuzhiyun 113*4882a593Smuzhiyun extern struct ext2_data *ext4fs_root; 114*4882a593Smuzhiyun 115*4882a593Smuzhiyun int ext4fs_init_journal(void); 116*4882a593Smuzhiyun int ext4fs_log_gdt(char *gd_table); 117*4882a593Smuzhiyun int ext4fs_check_journal_state(int recovery_flag); 118*4882a593Smuzhiyun int ext4fs_log_journal(char *journal_buffer, uint32_t blknr); 119*4882a593Smuzhiyun int ext4fs_put_metadata(char *metadata_buffer, uint32_t blknr); 120*4882a593Smuzhiyun void ext4fs_update_journal(void); 121*4882a593Smuzhiyun void ext4fs_dump_metadata(void); 122*4882a593Smuzhiyun void ext4fs_push_revoke_blk(char *buffer); 123*4882a593Smuzhiyun void ext4fs_free_journal(void); 124*4882a593Smuzhiyun void ext4fs_free_revoke_blks(void); 125*4882a593Smuzhiyun #endif 126