/*
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* (C) Copyright 2011 - 2012 Samsung Electronics
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* EXT4 filesystem implementation in Uboot by
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* Uma Shankar <uma.shankar@samsung.com>
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* Manjunatha C Achar <a.manjunatha@samsung.com>
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*
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* Journal data structures and headers for Journaling feature of ext4
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* have been referred from JBD2 (Journaling Block device 2)
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* implementation in Linux Kernel.
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*
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* Written by Stephen C. Tweedie <sct@redhat.com>
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*
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* Copyright 1998-2000 Red Hat, Inc --- All Rights Reserved
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef __EXT4_JRNL__
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#define __EXT4_JRNL__
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#define EXT2_JOURNAL_INO 8 /* Journal inode */
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#define EXT2_JOURNAL_SUPERBLOCK 0 /* Journal Superblock number */
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#define JBD2_FEATURE_COMPAT_CHECKSUM 0x00000001
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#define EXT3_JOURNAL_MAGIC_NUMBER 0xc03b3998U
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#define TRANSACTION_RUNNING 1
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#define TRANSACTION_COMPLETE 0
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#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
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#define EXT3_JOURNAL_DESCRIPTOR_BLOCK 1
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#define EXT3_JOURNAL_COMMIT_BLOCK 2
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#define EXT3_JOURNAL_SUPERBLOCK_V1 3
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#define EXT3_JOURNAL_SUPERBLOCK_V2 4
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#define EXT3_JOURNAL_REVOKE_BLOCK 5
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#define EXT3_JOURNAL_FLAG_ESCAPE 1
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#define EXT3_JOURNAL_FLAG_SAME_UUID 2
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#define EXT3_JOURNAL_FLAG_DELETED 4
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#define EXT3_JOURNAL_FLAG_LAST_TAG 8
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/* Maximum entries in 1 journal transaction */
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#define MAX_JOURNAL_ENTRIES 100
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struct journal_log {
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char *buf;
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int blknr;
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};
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struct dirty_blocks {
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char *buf;
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int blknr;
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};
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/* Standard header for all descriptor blocks: */
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struct journal_header_t {
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__be32 h_magic;
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__be32 h_blocktype;
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__be32 h_sequence;
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};
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/* The journal superblock. All fields are in big-endian byte order. */
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struct journal_superblock_t {
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/* 0x0000 */
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struct journal_header_t s_header;
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/* Static information describing the journal */
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__be32 s_blocksize; /* journal device blocksize */
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__be32 s_maxlen; /* total blocks in journal file */
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__be32 s_first; /* first block of log information */
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/* Dynamic information describing the current state of the log */
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__be32 s_sequence; /* first commit ID expected in log */
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__be32 s_start; /* blocknr of start of log */
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/* Error value, as set by journal_abort(). */
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__be32 s_errno;
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/* Remaining fields are only valid in a version-2 superblock */
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__be32 s_feature_compat; /* compatible feature set */
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__be32 s_feature_incompat; /* incompatible feature set */
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__be32 s_feature_ro_compat; /* readonly-compatible feature set */
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/* 0x0030 */
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__u8 s_uuid[16]; /* 128-bit uuid for journal */
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/* 0x0040 */
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__be32 s_nr_users; /* Nr of filesystems sharing log */
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__be32 s_dynsuper; /* Blocknr of dynamic superblock copy */
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/* 0x0048 */
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__be32 s_max_transaction; /* Limit of journal blocks per trans. */
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__be32 s_max_trans_data; /* Limit of data blocks per trans. */
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/* 0x0050 */
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__be32 s_padding[44];
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/* 0x0100 */
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__u8 s_users[16 * 48]; /* ids of all fs'es sharing the log */
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/* 0x0400 */
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} ;
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struct ext3_journal_block_tag {
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__be32 block;
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__be32 flags;
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};
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struct journal_revoke_header_t {
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struct journal_header_t r_header;
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__be32 r_count; /* Count of bytes used in the block */
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};
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struct revoke_blk_list {
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char *content; /* revoke block itself */
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struct revoke_blk_list *next;
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};
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extern struct ext2_data *ext4fs_root;
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int ext4fs_init_journal(void);
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int ext4fs_log_gdt(char *gd_table);
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int ext4fs_check_journal_state(int recovery_flag);
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int ext4fs_log_journal(char *journal_buffer, uint32_t blknr);
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int ext4fs_put_metadata(char *metadata_buffer, uint32_t blknr);
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void ext4fs_update_journal(void);
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void ext4fs_dump_metadata(void);
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void ext4fs_push_revoke_blk(char *buffer);
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void ext4fs_free_journal(void);
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void ext4fs_free_revoke_blks(void);
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#endif
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