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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 | |
1a459660 | 14 | * SPDX-License-Identifier: GPL-2.0+ |
ed34f34d US |
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 { | |
2a0b7a97 MW |
52 | __be32 h_magic; |
53 | __be32 h_blocktype; | |
54 | __be32 h_sequence; | |
ed34f34d US |
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 */ | |
2a0b7a97 MW |
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 */ | |
ed34f34d US |
66 | |
67 | /* Dynamic information describing the current state of the log */ | |
2a0b7a97 MW |
68 | __be32 s_sequence; /* first commit ID expected in log */ |
69 | __be32 s_start; /* blocknr of start of log */ | |
ed34f34d US |
70 | |
71 | /* Error value, as set by journal_abort(). */ | |
2a0b7a97 | 72 | __be32 s_errno; |
ed34f34d US |
73 | |
74 | /* Remaining fields are only valid in a version-2 superblock */ | |
2a0b7a97 MW |
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 */ | |
ed34f34d US |
78 | /* 0x0030 */ |
79 | __u8 s_uuid[16]; /* 128-bit uuid for journal */ | |
80 | ||
81 | /* 0x0040 */ | |
2a0b7a97 | 82 | __be32 s_nr_users; /* Nr of filesystems sharing log */ |
ed34f34d | 83 | |
2a0b7a97 | 84 | __be32 s_dynsuper; /* Blocknr of dynamic superblock copy */ |
ed34f34d US |
85 | |
86 | /* 0x0048 */ | |
2a0b7a97 MW |
87 | __be32 s_max_transaction; /* Limit of journal blocks per trans. */ |
88 | __be32 s_max_trans_data; /* Limit of data blocks per trans. */ | |
ed34f34d US |
89 | |
90 | /* 0x0050 */ | |
2a0b7a97 | 91 | __be32 s_padding[44]; |
ed34f34d US |
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 { | |
2a0b7a97 MW |
99 | __be32 block; |
100 | __be32 flags; | |
ed34f34d US |
101 | }; |
102 | ||
103 | struct journal_revoke_header_t { | |
104 | struct journal_header_t r_header; | |
2a0b7a97 | 105 | __be32 r_count; /* Count of bytes used in the block */ |
ed34f34d US |
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, long int blknr); | |
119 | int ext4fs_put_metadata(char *metadata_buffer, long int 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 |