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