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>
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.
11 * Written by Stephen C. Tweedie <sct@redhat.com>
13 * Copyright 1998-2000 Red Hat, Inc --- All Rights Reserved
14 * SPDX-License-Identifier: GPL-2.0+
20 #define EXT2_JOURNAL_INO 8 /* Journal inode */
21 #define EXT2_JOURNAL_SUPERBLOCK 0 /* Journal Superblock number */
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
38 /* Maximum entries in 1 journal transaction */
39 #define MAX_JOURNAL_ENTRIES 100
50 /* Standard header for all descriptor blocks: */
51 struct journal_header_t
{
57 /* The journal superblock. All fields are in big-endian byte order. */
58 struct journal_superblock_t
{
60 struct journal_header_t s_header
;
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 */
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 */
71 /* Error value, as set by journal_abort(). */
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 */
79 __u8 s_uuid
[16]; /* 128-bit uuid for journal */
82 __be32 s_nr_users
; /* Nr of filesystems sharing log */
84 __be32 s_dynsuper
; /* Blocknr of dynamic superblock copy */
87 __be32 s_max_transaction
; /* Limit of journal blocks per trans. */
88 __be32 s_max_trans_data
; /* Limit of data blocks per trans. */
94 __u8 s_users
[16 * 48]; /* ids of all fs'es sharing the log */
98 struct ext3_journal_block_tag
{
103 struct journal_revoke_header_t
{
104 struct journal_header_t r_header
;
105 __be32 r_count
; /* Count of bytes used in the block */
108 struct revoke_blk_list
{
109 char *content
; /* revoke block itself */
110 struct revoke_blk_list
*next
;
113 extern struct ext2_data
*ext4fs_root
;
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);