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 EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 21 22 #define EXT2_JOURNAL_INO 8 /* Journal inode */ 23 #define EXT2_JOURNAL_SUPERBLOCK 0 /* Journal Superblock number */ 24 25 #define JBD2_FEATURE_COMPAT_CHECKSUM 0x00000001 26 #define EXT3_JOURNAL_MAGIC_NUMBER 0xc03b3998U 27 #define TRANSACTION_RUNNING 1 28 #define TRANSACTION_COMPLETE 0 29 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 30 #define EXT3_JOURNAL_DESCRIPTOR_BLOCK 1 31 #define EXT3_JOURNAL_COMMIT_BLOCK 2 32 #define EXT3_JOURNAL_SUPERBLOCK_V1 3 33 #define EXT3_JOURNAL_SUPERBLOCK_V2 4 34 #define EXT3_JOURNAL_REVOKE_BLOCK 5 35 #define EXT3_JOURNAL_FLAG_ESCAPE 1 36 #define EXT3_JOURNAL_FLAG_SAME_UUID 2 37 #define EXT3_JOURNAL_FLAG_DELETED 4 38 #define EXT3_JOURNAL_FLAG_LAST_TAG 8 39 40 /* Maximum entries in 1 journal transaction */ 41 #define MAX_JOURNAL_ENTRIES 100 42 struct journal_log { 43 char *buf; 44 int blknr; 45 }; 46 47 struct dirty_blocks { 48 char *buf; 49 int blknr; 50 }; 51 52 /* Standard header for all descriptor blocks: */ 53 struct journal_header_t { 54 __be32 h_magic; 55 __be32 h_blocktype; 56 __be32 h_sequence; 57 }; 58 59 /* The journal superblock. All fields are in big-endian byte order. */ 60 struct journal_superblock_t { 61 /* 0x0000 */ 62 struct journal_header_t s_header; 63 64 /* Static information describing the journal */ 65 __be32 s_blocksize; /* journal device blocksize */ 66 __be32 s_maxlen; /* total blocks in journal file */ 67 __be32 s_first; /* first block of log information */ 68 69 /* Dynamic information describing the current state of the log */ 70 __be32 s_sequence; /* first commit ID expected in log */ 71 __be32 s_start; /* blocknr of start of log */ 72 73 /* Error value, as set by journal_abort(). */ 74 __be32 s_errno; 75 76 /* Remaining fields are only valid in a version-2 superblock */ 77 __be32 s_feature_compat; /* compatible feature set */ 78 __be32 s_feature_incompat; /* incompatible feature set */ 79 __be32 s_feature_ro_compat; /* readonly-compatible feature set */ 80 /* 0x0030 */ 81 __u8 s_uuid[16]; /* 128-bit uuid for journal */ 82 83 /* 0x0040 */ 84 __be32 s_nr_users; /* Nr of filesystems sharing log */ 85 86 __be32 s_dynsuper; /* Blocknr of dynamic superblock copy */ 87 88 /* 0x0048 */ 89 __be32 s_max_transaction; /* Limit of journal blocks per trans. */ 90 __be32 s_max_trans_data; /* Limit of data blocks per trans. */ 91 92 /* 0x0050 */ 93 __be32 s_padding[44]; 94 95 /* 0x0100 */ 96 __u8 s_users[16 * 48]; /* ids of all fs'es sharing the log */ 97 /* 0x0400 */ 98 } ; 99 100 struct ext3_journal_block_tag { 101 __be32 block; 102 __be32 flags; 103 }; 104 105 struct journal_revoke_header_t { 106 struct journal_header_t r_header; 107 __be32 r_count; /* Count of bytes used in the block */ 108 }; 109 110 struct revoke_blk_list { 111 char *content; /* revoke block itself */ 112 struct revoke_blk_list *next; 113 }; 114 115 extern struct ext2_data *ext4fs_root; 116 117 int ext4fs_init_journal(void); 118 int ext4fs_log_gdt(char *gd_table); 119 int ext4fs_check_journal_state(int recovery_flag); 120 int ext4fs_log_journal(char *journal_buffer, uint32_t blknr); 121 int ext4fs_put_metadata(char *metadata_buffer, uint32_t blknr); 122 void ext4fs_update_journal(void); 123 void ext4fs_dump_metadata(void); 124 void ext4fs_push_revoke_blk(char *buffer); 125 void ext4fs_free_journal(void); 126 void ext4fs_free_revoke_blks(void); 127 #endif 128