ref: 4f5c65dc000b46989df352adbafcd8d264f16a3c
dir: /lwext4/ext4_journal.c/
/*
* Copyright (c) 2015 Grzegorz Kostka ([email protected])
* Copyright (c) 2015 Kaho Ng ([email protected])
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup lwext4
* @{
*/
/**
* @file ext4_journal.c
* @brief Journal handle functions
*/
#include "ext4_config.h"
#include "ext4_types.h"
#include "ext4_fs.h"
#include "ext4_super.h"
#include "ext4_errno.h"
#include "ext4_blockdev.h"
#include "ext4_crc32c.h"
#include "ext4_debug.h"
#include "tree.h"
#include <string.h>
#include <stdlib.h>
struct revoke_entry {
ext4_fsblk_t block;
uint32_t trans_id;
RB_ENTRY(revoke_entry) revoke_node;
};
struct recover_info {
uint32_t start_trans_id;
uint32_t last_trans_id;
uint32_t this_trans_id;
RB_HEAD(jbd_revoke, revoke_entry) revoke_root;
};
struct replay_arg {
struct recover_info *info;
uint32_t *this_block;
uint32_t this_trans_id;
};
static int
jbd_revoke_entry_cmp(struct revoke_entry *a, struct revoke_entry *b)
{
if (a->block > b->block)
return 1;
else if (a->block < b->block)
return -1;
return 0;
}
RB_GENERATE_INTERNAL(jbd_revoke, revoke_entry, revoke_node,
jbd_revoke_entry_cmp, static inline)
#define jbd_alloc_revoke_entry() calloc(1, sizeof(struct revoke_entry))
#define jbd_free_revoke_entry(addr) free(addr)
int jbd_inode_bmap(struct jbd_fs *jbd_fs,
ext4_lblk_t iblock,
ext4_fsblk_t *fblock);
int jbd_sb_write(struct jbd_fs *jbd_fs, struct jbd_sb *s)
{
int rc;
struct ext4_fs *fs = jbd_fs->inode_ref.fs;
uint64_t offset;
ext4_fsblk_t fblock;
rc = jbd_inode_bmap(jbd_fs, 0, &fblock);
if (rc != EOK)
return rc;
offset = fblock * ext4_sb_get_block_size(&fs->sb);
return ext4_block_writebytes(fs->bdev, offset, s,
EXT4_SUPERBLOCK_SIZE);
}
int jbd_sb_read(struct jbd_fs *jbd_fs, struct jbd_sb *s)
{
int rc;
struct ext4_fs *fs = jbd_fs->inode_ref.fs;
uint64_t offset;
ext4_fsblk_t fblock;
rc = jbd_inode_bmap(jbd_fs, 0, &fblock);
if (rc != EOK)
return rc;
offset = fblock * ext4_sb_get_block_size(&fs->sb);
return ext4_block_readbytes(fs->bdev, offset, s,
EXT4_SUPERBLOCK_SIZE);
}
static bool jbd_verify_sb(struct jbd_sb *sb)
{
struct jbd_bhdr *header = &sb->header;
if (jbd_get32(header, magic) != JBD_MAGIC_NUMBER)
return false;
if (jbd_get32(header, blocktype) != JBD_SUPERBLOCK &&
jbd_get32(header, blocktype) != JBD_SUPERBLOCK_V2)
return false;
return true;
}
static int jbd_write_sb(struct jbd_fs *jbd_fs)
{
int rc = EOK;
if (jbd_fs->dirty) {
rc = jbd_sb_write(jbd_fs, &jbd_fs->sb);
if (rc != EOK)
return rc;
jbd_fs->dirty = false;
}
return rc;
}
int jbd_get_fs(struct ext4_fs *fs,
struct jbd_fs *jbd_fs)
{
int rc;
uint32_t journal_ino;
memset(jbd_fs, 0, sizeof(struct jbd_fs));
journal_ino = ext4_get32(&fs->sb, journal_inode_number);
rc = ext4_fs_get_inode_ref(fs,
journal_ino,
&jbd_fs->inode_ref);
if (rc != EOK) {
memset(jbd_fs, 0, sizeof(struct jbd_fs));
return rc;
}
rc = jbd_sb_read(jbd_fs, &jbd_fs->sb);
if (rc != EOK) {
memset(jbd_fs, 0, sizeof(struct jbd_fs));
ext4_fs_put_inode_ref(&jbd_fs->inode_ref);
return rc;
}
if (!jbd_verify_sb(&jbd_fs->sb)) {
memset(jbd_fs, 0, sizeof(struct jbd_fs));
ext4_fs_put_inode_ref(&jbd_fs->inode_ref);
rc = EIO;
}
return rc;
}
int jbd_put_fs(struct jbd_fs *jbd_fs)
{
int rc = EOK;
rc = jbd_write_sb(jbd_fs);
ext4_fs_put_inode_ref(&jbd_fs->inode_ref);
return rc;
}
int jbd_inode_bmap(struct jbd_fs *jbd_fs,
ext4_lblk_t iblock,
ext4_fsblk_t *fblock)
{
int rc = ext4_fs_get_inode_dblk_idx(
&jbd_fs->inode_ref,
iblock,
fblock,
false);
return rc;
}
int jbd_block_get(struct jbd_fs *jbd_fs,
struct ext4_block *block,
ext4_fsblk_t fblock)
{
/* TODO: journal device. */
int rc;
ext4_lblk_t iblock = (ext4_lblk_t)fblock;
rc = jbd_inode_bmap(jbd_fs, iblock,
&fblock);
if (rc != EOK)
return rc;
struct ext4_blockdev *bdev = jbd_fs->inode_ref.fs->bdev;
rc = ext4_block_get(bdev, block, fblock);
return rc;
}
int jbd_block_get_noread(struct jbd_fs *jbd_fs,
struct ext4_block *block,
ext4_fsblk_t fblock)
{
/* TODO: journal device. */
int rc;
ext4_lblk_t iblock = (ext4_lblk_t)fblock;
rc = jbd_inode_bmap(jbd_fs, iblock,
&fblock);
if (rc != EOK)
return rc;
struct ext4_blockdev *bdev = jbd_fs->inode_ref.fs->bdev;
rc = ext4_block_get_noread(bdev, block, fblock);
return rc;
}
int jbd_block_set(struct jbd_fs *jbd_fs,
struct ext4_block *block)
{
return ext4_block_set(jbd_fs->inode_ref.fs->bdev,
block);
}
/*
* helper functions to deal with 32 or 64bit block numbers.
*/
int jbd_tag_bytes(struct jbd_fs *jbd_fs)
{
int size;
if (JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
JBD_FEATURE_INCOMPAT_CSUM_V3))
return sizeof(struct jbd_block_tag3);
size = sizeof(struct jbd_block_tag);
if (JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
JBD_FEATURE_INCOMPAT_CSUM_V2))
size += sizeof(uint16_t);
if (JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
JBD_FEATURE_INCOMPAT_64BIT))
return size;
return size - sizeof(uint32_t);
}
/**@brief: tag information. */
struct tag_info {
int tag_bytes;
ext4_fsblk_t block;
bool uuid_exist;
uint8_t uuid[UUID_SIZE];
bool last_tag;
};
static int
jbd_extract_block_tag(struct jbd_fs *jbd_fs,
void *__tag,
int tag_bytes,
int32_t remain_buf_size,
struct tag_info *tag_info)
{
char *uuid_start;
tag_info->tag_bytes = tag_bytes;
tag_info->uuid_exist = false;
tag_info->last_tag = false;
if (remain_buf_size - tag_bytes < 0)
return EINVAL;
if (JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
JBD_FEATURE_INCOMPAT_CSUM_V3)) {
struct jbd_block_tag3 *tag = __tag;
tag_info->block = jbd_get32(tag, blocknr);
if (JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
JBD_FEATURE_INCOMPAT_64BIT))
tag_info->block |=
(uint64_t)jbd_get32(tag, blocknr_high) << 32;
if (jbd_get32(tag, flags) & JBD_FLAG_ESCAPE)
tag_info->block = 0;
if (!(jbd_get32(tag, flags) & JBD_FLAG_SAME_UUID)) {
if (remain_buf_size - tag_bytes < UUID_SIZE)
return EINVAL;
uuid_start = (char *)tag + tag_bytes;
tag_info->uuid_exist = true;
tag_info->tag_bytes += UUID_SIZE;
memcpy(tag_info->uuid, uuid_start, UUID_SIZE);
}
if (jbd_get32(tag, flags) & JBD_FLAG_LAST_TAG)
tag_info->last_tag = true;
} else {
struct jbd_block_tag *tag = __tag;
tag_info->block = jbd_get32(tag, blocknr);
if (JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
JBD_FEATURE_INCOMPAT_64BIT))
tag_info->block |=
(uint64_t)jbd_get32(tag, blocknr_high) << 32;
if (jbd_get16(tag, flags) & JBD_FLAG_ESCAPE)
tag_info->block = 0;
if (!(jbd_get16(tag, flags) & JBD_FLAG_SAME_UUID)) {
if (remain_buf_size - tag_bytes < UUID_SIZE)
return EINVAL;
uuid_start = (char *)tag + tag_bytes;
tag_info->uuid_exist = true;
tag_info->tag_bytes += UUID_SIZE;
memcpy(tag_info->uuid, uuid_start, UUID_SIZE);
}
if (jbd_get16(tag, flags) & JBD_FLAG_LAST_TAG)
tag_info->last_tag = true;
}
return EOK;
}
static int
jbd_write_block_tag(struct jbd_fs *jbd_fs,
void *__tag,
int32_t remain_buf_size,
struct tag_info *tag_info)
{
char *uuid_start;
int tag_bytes = jbd_tag_bytes(jbd_fs);
tag_info->tag_bytes = tag_bytes;
if (remain_buf_size - tag_bytes < 0)
return EINVAL;
if (JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
JBD_FEATURE_INCOMPAT_CSUM_V3)) {
struct jbd_block_tag3 *tag = __tag;
jbd_set32(tag, blocknr, tag_info->block);
if (JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
JBD_FEATURE_INCOMPAT_64BIT))
jbd_set32(tag, blocknr_high, tag_info->block >> 32);
if (tag_info->uuid_exist) {
if (remain_buf_size - tag_bytes < UUID_SIZE)
return EINVAL;
uuid_start = (char *)tag + tag_bytes;
tag_info->tag_bytes += UUID_SIZE;
memcpy(uuid_start, tag_info->uuid, UUID_SIZE);
} else
jbd_set32(tag, flags,
jbd_get32(tag, flags) | JBD_FLAG_SAME_UUID);
if (tag_info->last_tag)
jbd_set32(tag, flags,
jbd_get32(tag, flags) | JBD_FLAG_LAST_TAG);
} else {
struct jbd_block_tag *tag = __tag;
jbd_set32(tag, blocknr, tag_info->block);
if (JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
JBD_FEATURE_INCOMPAT_64BIT))
jbd_set32(tag, blocknr_high, tag_info->block >> 32);
if (tag_info->uuid_exist) {
if (remain_buf_size - tag_bytes < UUID_SIZE)
return EINVAL;
uuid_start = (char *)tag + tag_bytes;
tag_info->tag_bytes += UUID_SIZE;
memcpy(uuid_start, tag_info->uuid, UUID_SIZE);
} else
jbd_set16(tag, flags,
jbd_get16(tag, flags) | JBD_FLAG_SAME_UUID);
if (tag_info->last_tag)
jbd_set16(tag, flags,
jbd_get16(tag, flags) | JBD_FLAG_LAST_TAG);
}
return EOK;
}
static void
jbd_iterate_block_table(struct jbd_fs *jbd_fs,
void *__tag_start,
int32_t tag_tbl_size,
void (*func)(struct jbd_fs * jbd_fs,
ext4_fsblk_t block,
uint8_t *uuid,
void *arg),
void *arg)
{
char *tag_start, *tag_ptr;
int tag_bytes = jbd_tag_bytes(jbd_fs);
tag_start = __tag_start;
tag_ptr = tag_start;
if (JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
JBD_FEATURE_INCOMPAT_CSUM_V2) ||
JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
JBD_FEATURE_INCOMPAT_CSUM_V3))
tag_tbl_size -= sizeof(struct jbd_block_tail);
while (tag_tbl_size) {
struct tag_info tag_info;
int rc = jbd_extract_block_tag(jbd_fs,
tag_ptr,
tag_bytes,
tag_tbl_size,
&tag_info);
if (rc != EOK)
break;
if (func)
func(jbd_fs, tag_info.block, tag_info.uuid, arg);
if (tag_info.last_tag)
break;
tag_ptr += tag_info.tag_bytes;
tag_tbl_size -= tag_info.tag_bytes;
}
}
static void jbd_display_block_tags(struct jbd_fs *jbd_fs,
ext4_fsblk_t block,
uint8_t *uuid,
void *arg)
{
uint32_t *iblock = arg;
ext4_dbg(DEBUG_JBD, "Block in block_tag: %" PRIu64 "\n", block);
(*iblock)++;
(void)jbd_fs;
(void)uuid;
return;
}
static struct revoke_entry *
jbd_revoke_entry_lookup(struct recover_info *info, ext4_fsblk_t block)
{
struct revoke_entry tmp = {
.block = block
};
return RB_FIND(jbd_revoke, &info->revoke_root, &tmp);
}
static void jbd_replay_block_tags(struct jbd_fs *jbd_fs,
ext4_fsblk_t block,
uint8_t *uuid __unused,
void *__arg)
{
int r;
struct replay_arg *arg = __arg;
struct recover_info *info = arg->info;
uint32_t *this_block = arg->this_block;
struct revoke_entry *revoke_entry;
struct ext4_block journal_block, ext4_block;
struct ext4_fs *fs = jbd_fs->inode_ref.fs;
(*this_block)++;
revoke_entry = jbd_revoke_entry_lookup(info, block);
if (revoke_entry &&
arg->this_trans_id < revoke_entry->trans_id)
return;
ext4_dbg(DEBUG_JBD,
"Replaying block in block_tag: %" PRIu64 "\n",
block);
r = jbd_block_get(jbd_fs, &journal_block, *this_block);
if (r != EOK)
return;
if (block) {
r = ext4_block_get_noread(fs->bdev, &ext4_block, block);
if (r != EOK) {
jbd_block_set(jbd_fs, &journal_block);
return;
}
memcpy(ext4_block.data,
journal_block.data,
jbd_get32(&jbd_fs->sb, blocksize));
ext4_bcache_set_dirty(ext4_block.buf);
ext4_block_set(fs->bdev, &ext4_block);
} else {
uint16_t mount_count, state;
mount_count = ext4_get16(&fs->sb, mount_count);
state = ext4_get16(&fs->sb, state);
memcpy(&fs->sb,
journal_block.data + EXT4_SUPERBLOCK_OFFSET,
EXT4_SUPERBLOCK_SIZE);
/* Mark system as mounted */
ext4_set16(&fs->sb, state, state);
r = ext4_sb_write(fs->bdev, &fs->sb);
if (r != EOK)
return;
/*Update mount count*/
ext4_set16(&fs->sb, mount_count, mount_count);
}
jbd_block_set(jbd_fs, &journal_block);
return;
}
static void jbd_add_revoke_block_tags(struct recover_info *info,
ext4_fsblk_t block)
{
struct revoke_entry *revoke_entry;
ext4_dbg(DEBUG_JBD, "Add block %" PRIu64 " to revoke tree\n", block);
revoke_entry = jbd_revoke_entry_lookup(info, block);
if (revoke_entry) {
revoke_entry->trans_id = info->this_trans_id;
return;
}
revoke_entry = jbd_alloc_revoke_entry();
ext4_assert(revoke_entry);
revoke_entry->block = block;
revoke_entry->trans_id = info->this_trans_id;
RB_INSERT(jbd_revoke, &info->revoke_root, revoke_entry);
return;
}
static void jbd_destroy_revoke_tree(struct recover_info *info)
{
while (!RB_EMPTY(&info->revoke_root)) {
struct revoke_entry *revoke_entry =
RB_MIN(jbd_revoke, &info->revoke_root);
ext4_assert(revoke_entry);
RB_REMOVE(jbd_revoke, &info->revoke_root, revoke_entry);
jbd_free_revoke_entry(revoke_entry);
}
}
/* Make sure we wrap around the log correctly! */
#define wrap(sb, var) \
do { \
if (var >= jbd_get32((sb), maxlen)) \
var -= (jbd_get32((sb), maxlen) - jbd_get32((sb), first)); \
} while (0)
#define ACTION_SCAN 0
#define ACTION_REVOKE 1
#define ACTION_RECOVER 2
static void jbd_build_revoke_tree(struct jbd_fs *jbd_fs,
struct jbd_bhdr *header,
struct recover_info *info)
{
char *blocks_entry;
struct jbd_revoke_header *revoke_hdr =
(struct jbd_revoke_header *)header;
uint32_t i, nr_entries, record_len = 4;
if (JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
JBD_FEATURE_INCOMPAT_64BIT))
record_len = 8;
nr_entries = (jbd_get32(revoke_hdr, count) -
sizeof(struct jbd_revoke_header)) /
record_len;
blocks_entry = (char *)(revoke_hdr + 1);
for (i = 0;i < nr_entries;i++) {
if (record_len == 8) {
uint64_t *blocks =
(uint64_t *)blocks_entry;
jbd_add_revoke_block_tags(info, to_be64(*blocks));
} else {
uint32_t *blocks =
(uint32_t *)blocks_entry;
jbd_add_revoke_block_tags(info, to_be32(*blocks));
}
blocks_entry += record_len;
}
}
static void jbd_debug_descriptor_block(struct jbd_fs *jbd_fs,
struct jbd_bhdr *header,
uint32_t *iblock)
{
jbd_iterate_block_table(jbd_fs,
header + 1,
jbd_get32(&jbd_fs->sb, blocksize) -
sizeof(struct jbd_bhdr),
jbd_display_block_tags,
iblock);
}
static void jbd_replay_descriptor_block(struct jbd_fs *jbd_fs,
struct jbd_bhdr *header,
struct replay_arg *arg)
{
jbd_iterate_block_table(jbd_fs,
header + 1,
jbd_get32(&jbd_fs->sb, blocksize) -
sizeof(struct jbd_bhdr),
jbd_replay_block_tags,
arg);
}
int jbd_iterate_log(struct jbd_fs *jbd_fs,
struct recover_info *info,
int action)
{
int r = EOK;
bool log_end = false;
struct jbd_sb *sb = &jbd_fs->sb;
uint32_t start_trans_id, this_trans_id;
uint32_t start_block, this_block;
start_trans_id = this_trans_id = jbd_get32(sb, sequence);
start_block = this_block = jbd_get32(sb, start);
ext4_dbg(DEBUG_JBD, "Start of journal at trans id: %" PRIu32 "\n",
start_trans_id);
while (!log_end) {
struct ext4_block block;
struct jbd_bhdr *header;
if (action != ACTION_SCAN)
if (this_trans_id > info->last_trans_id) {
log_end = true;
continue;
}
r = jbd_block_get(jbd_fs, &block, this_block);
if (r != EOK)
break;
header = (struct jbd_bhdr *)block.data;
if (jbd_get32(header, magic) != JBD_MAGIC_NUMBER) {
jbd_block_set(jbd_fs, &block);
log_end = true;
continue;
}
if (jbd_get32(header, sequence) != this_trans_id) {
if (action != ACTION_SCAN)
r = EIO;
jbd_block_set(jbd_fs, &block);
log_end = true;
continue;
}
switch (jbd_get32(header, blocktype)) {
case JBD_DESCRIPTOR_BLOCK:
ext4_dbg(DEBUG_JBD, "Descriptor block: %" PRIu32", "
"trans_id: %" PRIu32"\n",
this_block, this_trans_id);
if (action == ACTION_RECOVER) {
struct replay_arg replay_arg;
replay_arg.info = info;
replay_arg.this_block = &this_block;
replay_arg.this_trans_id = this_trans_id;
jbd_replay_descriptor_block(jbd_fs,
header, &replay_arg);
} else
jbd_debug_descriptor_block(jbd_fs,
header, &this_block);
break;
case JBD_COMMIT_BLOCK:
ext4_dbg(DEBUG_JBD, "Commit block: %" PRIu32", "
"trans_id: %" PRIu32"\n",
this_block, this_trans_id);
this_trans_id++;
break;
case JBD_REVOKE_BLOCK:
ext4_dbg(DEBUG_JBD, "Revoke block: %" PRIu32", "
"trans_id: %" PRIu32"\n",
this_block, this_trans_id);
if (action == ACTION_REVOKE) {
info->this_trans_id = this_trans_id;
jbd_build_revoke_tree(jbd_fs,
header, info);
}
break;
default:
log_end = true;
break;
}
jbd_block_set(jbd_fs, &block);
this_block++;
wrap(sb, this_block);
if (this_block == start_block)
log_end = true;
}
ext4_dbg(DEBUG_JBD, "End of journal.\n");
if (r == EOK && action == ACTION_SCAN) {
info->start_trans_id = start_trans_id;
if (this_trans_id > start_trans_id)
info->last_trans_id = this_trans_id - 1;
else
info->last_trans_id = this_trans_id;
}
return r;
}
int jbd_recover(struct jbd_fs *jbd_fs)
{
int r;
struct recover_info info;
struct jbd_sb *sb = &jbd_fs->sb;
if (!sb->start)
return EOK;
RB_INIT(&info.revoke_root);
r = jbd_iterate_log(jbd_fs, &info, ACTION_SCAN);
if (r != EOK)
return r;
r = jbd_iterate_log(jbd_fs, &info, ACTION_REVOKE);
if (r != EOK)
return r;
r = jbd_iterate_log(jbd_fs, &info, ACTION_RECOVER);
if (r == EOK) {
uint32_t features_incompatible =
ext4_get32(&jbd_fs->inode_ref.fs->sb,
features_incompatible);
jbd_set32(&jbd_fs->sb, start, 0);
features_incompatible &= ~EXT4_FINCOM_RECOVER;
ext4_set32(&jbd_fs->inode_ref.fs->sb,
features_incompatible,
features_incompatible);
jbd_fs->dirty = true;
}
jbd_destroy_revoke_tree(&info);
return r;
}
void jbd_journal_write_sb(struct jbd_journal *journal)
{
struct jbd_fs *jbd_fs = journal->jbd_fs;
jbd_set32(&jbd_fs->sb, start, journal->start);
jbd_set32(&jbd_fs->sb, sequence, journal->trans_id);
jbd_fs->dirty = true;
}
int jbd_journal_start(struct jbd_fs *jbd_fs,
struct jbd_journal *journal)
{
journal->first = jbd_get32(&jbd_fs->sb, first);
journal->start = journal->first;
journal->last = journal->first;
journal->trans_id = 1;
journal->alloc_trans_id = 1;
journal->block_size = jbd_get32(&jbd_fs->sb, blocksize);
TAILQ_INIT(&journal->trans_queue);
TAILQ_INIT(&journal->cp_queue);
journal->jbd_fs = jbd_fs;
jbd_journal_write_sb(journal);
return jbd_write_sb(jbd_fs);
}
int jbd_journal_stop(struct jbd_journal *journal)
{
journal->start = 0;
journal->trans_id = 0;
jbd_journal_write_sb(journal);
return jbd_write_sb(journal->jbd_fs);
}
static uint32_t jbd_journal_alloc_block(struct jbd_journal *journal,
struct jbd_trans *trans)
{
uint32_t start_block = journal->last++;
trans->alloc_blocks++;
wrap(&journal->jbd_fs->sb, journal->last);
return start_block;
}
struct jbd_trans *
jbd_journal_new_trans(struct jbd_journal *journal)
{
struct jbd_trans *trans = calloc(1, sizeof(struct jbd_trans));
if (!trans)
return NULL;
/* We will assign a trans_id to this transaction,
* once it has been committed.*/
trans->journal = journal;
trans->error = EOK;
return trans;
}
static void jbd_trans_end_write(struct ext4_bcache *bc __unused,
struct ext4_buf *buf __unused,
int res,
void *arg);
int jbd_trans_add_block(struct jbd_trans *trans,
struct ext4_block *block)
{
struct jbd_buf *buf;
/* We do not need to add those unmodified buffer to
* a transaction. */
if (!ext4_bcache_test_flag(block->buf, BC_DIRTY))
return EOK;
buf = calloc(1, sizeof(struct jbd_buf));
if (!buf)
return ENOMEM;
buf->trans = trans;
buf->block = *block;
ext4_bcache_inc_ref(block->buf);
block->buf->end_write = jbd_trans_end_write;
block->buf->end_write_arg = trans;
trans->data_cnt++;
LIST_INSERT_HEAD(&trans->buf_list, buf, buf_node);
return EOK;
}
int jbd_trans_revoke_block(struct jbd_trans *trans,
ext4_fsblk_t lba)
{
struct jbd_revoke_rec *rec =
calloc(1, sizeof(struct jbd_revoke_rec));
if (!rec)
return ENOMEM;
rec->lba = lba;
LIST_INSERT_HEAD(&trans->revoke_list, rec, revoke_node);
return EOK;
}
void jbd_journal_free_trans(struct jbd_journal *journal,
struct jbd_trans *trans,
bool abort)
{
struct jbd_buf *jbd_buf, *tmp;
struct jbd_revoke_rec *rec, *tmp2;
struct ext4_fs *fs = journal->jbd_fs->inode_ref.fs;
LIST_FOREACH_SAFE(jbd_buf, &trans->buf_list, buf_node,
tmp) {
if (abort)
ext4_block_set(fs->bdev, &jbd_buf->block);
LIST_REMOVE(jbd_buf, buf_node);
free(jbd_buf);
}
LIST_FOREACH_SAFE(rec, &trans->revoke_list, revoke_node,
tmp2) {
LIST_REMOVE(rec, revoke_node);
free(rec);
}
free(trans);
}
static int jbd_trans_write_commit_block(struct jbd_trans *trans)
{
int rc;
struct jbd_commit_header *header;
uint32_t commit_iblock = 0;
struct ext4_block commit_block;
struct jbd_journal *journal = trans->journal;
commit_iblock = jbd_journal_alloc_block(journal, trans);
rc = jbd_block_get_noread(journal->jbd_fs,
&commit_block, commit_iblock);
if (rc != EOK)
return rc;
header = (struct jbd_commit_header *)commit_block.data;
jbd_set32(&header->header, magic, JBD_MAGIC_NUMBER);
jbd_set32(&header->header, blocktype, JBD_COMMIT_BLOCK);
jbd_set32(&header->header, sequence, trans->trans_id);
ext4_bcache_set_dirty(commit_block.buf);
rc = jbd_block_set(journal->jbd_fs, &commit_block);
if (rc != EOK)
return rc;
return EOK;
}
static int jbd_journal_prepare(struct jbd_journal *journal,
struct jbd_trans *trans)
{
int rc = EOK, i = 0;
int32_t tag_tbl_size;
uint32_t desc_iblock = 0;
uint32_t data_iblock = 0;
char *tag_start = NULL, *tag_ptr = NULL;
struct jbd_buf *jbd_buf;
struct ext4_block desc_block, data_block;
LIST_FOREACH(jbd_buf, &trans->buf_list, buf_node) {
struct tag_info tag_info;
bool uuid_exist = false;
again:
if (!desc_iblock) {
struct jbd_bhdr *bhdr;
desc_iblock = jbd_journal_alloc_block(journal, trans);
rc = jbd_block_get_noread(journal->jbd_fs,
&desc_block, desc_iblock);
if (rc != EOK)
break;
ext4_bcache_set_dirty(desc_block.buf);
bhdr = (struct jbd_bhdr *)desc_block.data;
jbd_set32(bhdr, magic, JBD_MAGIC_NUMBER);
jbd_set32(bhdr, blocktype, JBD_DESCRIPTOR_BLOCK);
jbd_set32(bhdr, sequence, trans->trans_id);
tag_start = (char *)(bhdr + 1);
tag_ptr = tag_start;
uuid_exist = true;
tag_tbl_size = journal->block_size -
sizeof(struct jbd_bhdr);
if (!trans->start_iblock)
trans->start_iblock = desc_iblock;
}
tag_info.block = jbd_buf->block.lb_id;
tag_info.uuid_exist = uuid_exist;
if (i == trans->data_cnt - 1)
tag_info.last_tag = true;
if (uuid_exist)
memcpy(tag_info.uuid, journal->jbd_fs->sb.uuid,
UUID_SIZE);
rc = jbd_write_block_tag(journal->jbd_fs,
tag_ptr,
tag_tbl_size,
&tag_info);
if (rc != EOK) {
jbd_block_set(journal->jbd_fs, &desc_block);
desc_iblock = 0;
goto again;
}
data_iblock = jbd_journal_alloc_block(journal, trans);
rc = jbd_block_get_noread(journal->jbd_fs,
&data_block, data_iblock);
if (rc != EOK)
break;
ext4_bcache_set_dirty(data_block.buf);
memcpy(data_block.data, jbd_buf->block.data,
journal->block_size);
rc = jbd_block_set(journal->jbd_fs, &data_block);
if (rc != EOK)
break;
tag_ptr += tag_info.tag_bytes;
tag_tbl_size -= tag_info.tag_bytes;
i++;
}
if (rc == EOK && desc_iblock)
jbd_block_set(journal->jbd_fs, &desc_block);
return rc;
}
static int
jbd_journal_prepare_revoke(struct jbd_journal *journal,
struct jbd_trans *trans)
{
int rc = EOK, i = 0;
int32_t tag_tbl_size;
uint32_t desc_iblock = 0;
char *blocks_entry = NULL;
struct jbd_revoke_rec *rec, *tmp;
struct ext4_block desc_block;
struct jbd_revoke_header *header = NULL;
int32_t record_len = 4;
if (JBD_HAS_INCOMPAT_FEATURE(&journal->jbd_fs->sb,
JBD_FEATURE_INCOMPAT_64BIT))
record_len = 8;
LIST_FOREACH_SAFE(rec, &trans->revoke_list, revoke_node,
tmp) {
again:
if (!desc_iblock) {
struct jbd_bhdr *bhdr;
desc_iblock = jbd_journal_alloc_block(journal, trans);
rc = jbd_block_get_noread(journal->jbd_fs,
&desc_block, desc_iblock);
if (rc != EOK) {
break;
}
ext4_bcache_set_dirty(desc_block.buf);
bhdr = (struct jbd_bhdr *)desc_block.data;
jbd_set32(bhdr, magic, JBD_MAGIC_NUMBER);
jbd_set32(bhdr, blocktype, JBD_REVOKE_BLOCK);
jbd_set32(bhdr, sequence, trans->trans_id);
header = (struct jbd_revoke_header *)bhdr;
blocks_entry = (char *)(header + 1);
tag_tbl_size = journal->block_size -
sizeof(struct jbd_revoke_header);
if (!trans->start_iblock)
trans->start_iblock = desc_iblock;
}
if (tag_tbl_size < record_len) {
jbd_set32(header, count,
journal->block_size - tag_tbl_size);
jbd_block_set(journal->jbd_fs, &desc_block);
desc_iblock = 0;
header = NULL;
goto again;
}
if (record_len == 8) {
uint64_t *blocks =
(uint64_t *)blocks_entry;
*blocks = to_be64(rec->lba);
} else {
uint32_t *blocks =
(uint32_t *)blocks_entry;
*blocks = to_be32(rec->lba);
}
blocks_entry += record_len;
tag_tbl_size -= record_len;
i++;
}
if (rc == EOK && desc_iblock) {
if (header != NULL)
jbd_set32(header, count,
journal->block_size - tag_tbl_size);
jbd_block_set(journal->jbd_fs, &desc_block);
}
return rc;
}
void
jbd_journal_submit_trans(struct jbd_journal *journal,
struct jbd_trans *trans)
{
TAILQ_INSERT_TAIL(&journal->trans_queue,
trans,
trans_node);
}
void jbd_journal_cp_trans(struct jbd_journal *journal, struct jbd_trans *trans)
{
struct jbd_buf *jbd_buf, *tmp;
struct ext4_fs *fs = journal->jbd_fs->inode_ref.fs;
LIST_FOREACH_SAFE(jbd_buf, &trans->buf_list, buf_node,
tmp) {
ext4_block_set(fs->bdev, &jbd_buf->block);
}
}
static void jbd_trans_end_write(struct ext4_bcache *bc __unused,
struct ext4_buf *buf __unused,
int res,
void *arg)
{
struct jbd_trans *trans = arg;
struct jbd_journal *journal = trans->journal;
if (res != EOK)
trans->error = res;
trans->written_cnt++;
if (trans->written_cnt == trans->data_cnt) {
again:
TAILQ_REMOVE(&journal->cp_queue, trans, trans_node);
journal->start = trans->start_iblock +
trans->alloc_blocks;
journal->trans_id = trans->trans_id + 1;
jbd_journal_write_sb(journal);
jbd_write_sb(journal->jbd_fs);
jbd_journal_free_trans(journal, trans, false);
if ((trans = TAILQ_FIRST(&journal->cp_queue))) {
if (trans->data_cnt) {
jbd_journal_cp_trans(journal, trans);
return;
}
goto again;
}
}
}
/*
* XXX: one should disable cache writeback first.
*/
void jbd_journal_commit_one(struct jbd_journal *journal)
{
int rc = EOK;
uint32_t last = journal->last;
struct jbd_trans *trans;
if ((trans = TAILQ_FIRST(&journal->trans_queue))) {
TAILQ_REMOVE(&journal->trans_queue, trans, trans_node);
trans->trans_id = journal->alloc_trans_id;
rc = jbd_journal_prepare(journal, trans);
if (rc != EOK)
goto Finish;
rc = jbd_journal_prepare_revoke(journal, trans);
if (rc != EOK)
goto Finish;
rc = jbd_trans_write_commit_block(trans);
if (rc != EOK)
goto Finish;
journal->alloc_trans_id++;
if (TAILQ_EMPTY(&journal->cp_queue)) {
if (trans->data_cnt) {
TAILQ_INSERT_TAIL(&journal->cp_queue, trans,
trans_node);
jbd_journal_cp_trans(journal, trans);
} else {
journal->start = trans->start_iblock +
trans->alloc_blocks;
journal->trans_id = trans->trans_id + 1;
jbd_journal_write_sb(journal);
jbd_write_sb(journal->jbd_fs);
jbd_journal_free_trans(journal, trans, false);
}
} else
TAILQ_INSERT_TAIL(&journal->cp_queue, trans,
trans_node);
}
Finish:
if (rc != EOK) {
journal->last = last;
jbd_journal_free_trans(journal, trans, true);
}
}
/**
* @}
*/