+/*
+ * Copyright (c) 2015 Grzegorz Kostka (kostka.grzegorz@gmail.com)
+ * Copyright (c) 2015 Kaho Ng (ngkaho1234@gmail.com)
+ * 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 Journalling
+ * @brief Journal handle functions
*/
#include "ext4_config.h"
#include "tree.h"
#include <string.h>
-#include <malloc.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,
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)
{
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;
- rc = ext4_fs_put_inode_ref(&jbd_fs->inode_ref);
+ int rc = EOK;
+ rc = jbd_write_sb(jbd_fs);
+
+ ext4_fs_put_inode_ref(&jbd_fs->inode_ref);
return rc;
}
ext4_lblk_t iblock,
ext4_fsblk_t *fblock)
{
- int rc = ext4_fs_get_inode_data_block_index(
+ int rc = ext4_fs_get_inode_dblk_idx(
&jbd_fs->inode_ref,
iblock,
fblock,
return size - sizeof(uint32_t);
}
-static void
+/**@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,
- uint32_t tag_bytes,
void *__tag,
- ext4_fsblk_t *block,
- bool *uuid_exist,
- uint8_t *uuid,
- bool *last_tag)
+ int tag_bytes,
+ int32_t remain_buf_size,
+ struct tag_info *tag_info)
{
char *uuid_start;
- *uuid_exist = false;
- *last_tag = false;
+ 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;
- *block = jbd_get32(tag, blocknr);
+ tag_info->block = jbd_get32(tag, blocknr);
if (JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
JBD_FEATURE_INCOMPAT_64BIT))
- *block |= (uint64_t)jbd_get32(tag, blocknr_high) << 32;
+ tag_info->block |=
+ (uint64_t)jbd_get32(tag, blocknr_high) << 32;
if (jbd_get32(tag, flags) & JBD_FLAG_ESCAPE)
- *block = 0;
+ 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;
- *uuid_exist = true;
- memcpy(uuid, uuid_start, UUID_SIZE);
+ 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)
- *last_tag = true;
+ tag_info->last_tag = true;
} else {
struct jbd_block_tag *tag = __tag;
- *block = jbd_get32(tag, blocknr);
+ tag_info->block = jbd_get32(tag, blocknr);
if (JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
JBD_FEATURE_INCOMPAT_64BIT))
- *block |= (uint64_t)jbd_get32(tag, blocknr_high) << 32;
+ tag_info->block |=
+ (uint64_t)jbd_get32(tag, blocknr_high) << 32;
- if (jbd_get32(tag, flags) & JBD_FLAG_ESCAPE)
- *block = 0;
+ 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;
- if (!(jbd_get32(tag, flags) & JBD_FLAG_SAME_UUID)) {
uuid_start = (char *)tag + tag_bytes;
- *uuid_exist = true;
- memcpy(uuid, uuid_start, UUID_SIZE);
+ 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)
- *last_tag = true;
+ 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);
+ 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);
+ 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,
- uint32_t tag_tbl_size,
+ int32_t tag_tbl_size,
void (*func)(struct jbd_fs * jbd_fs,
ext4_fsblk_t block,
uint8_t *uuid,
void *arg)
{
ext4_fsblk_t block = 0;
- uint8_t uuid[UUID_SIZE];
char *tag_start, *tag_ptr;
- uint32_t tag_bytes = jbd_tag_bytes(jbd_fs);
+ int tag_bytes = jbd_tag_bytes(jbd_fs);
tag_start = __tag_start;
tag_ptr = tag_start;
JBD_FEATURE_INCOMPAT_CSUM_V3))
tag_tbl_size -= sizeof(struct jbd_block_tail);
- while (tag_ptr - tag_start + tag_bytes <= tag_tbl_size) {
- bool uuid_exist;
- bool last_tag;
- jbd_extract_block_tag(jbd_fs,
- tag_bytes,
+ while (tag_tbl_size) {
+ struct tag_info tag_info;
+ int rc = jbd_extract_block_tag(jbd_fs,
tag_ptr,
- &block,
- &uuid_exist,
- uuid,
- &last_tag);
+ tag_bytes,
+ tag_tbl_size,
+ &tag_info);
+ if (rc != EOK)
+ break;
+
if (func)
- func(jbd_fs, block, uuid, arg);
+ func(jbd_fs, block, tag_info.uuid, arg);
- if (last_tag)
+ if (tag_info.last_tag)
break;
- tag_ptr += tag_bytes;
- if (uuid_exist)
- tag_ptr += UUID_SIZE;
-
+ tag_ptr += tag_info.tag_bytes;
+ tag_tbl_size -= tag_info.tag_bytes;
}
}
return;
}
-struct revoke_entry {
- ext4_fsblk_t block;
- uint32_t trans_id;
- RB_ENTRY(revoke_entry) revoke_node;
-};
+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) \
#define ACTION_REVOKE 1
#define ACTION_RECOVER 2
-struct recover_info {
- uint32_t start_trans_id;
- uint32_t last_trans_id;
- RB_HEAD(jbd_revoke, revoke_entry) revoke_root;
-};
-static void jbd_build_revoke_root(struct jbd_fs *jbd_fs,
+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;
-
- jbd_iterate_block_table(jbd_fs,
- revoke_hdr + 1,
- jbd_get32(&jbd_fs->sb, blocksize) -
- sizeof(struct jbd_revoke_header),
- jbd_display_block_tags,
- NULL);
-
- (void)info;
+ 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,
uint32_t *iblock)
{
jbd_iterate_block_table(jbd_fs,
- header,
+ 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)
switch (jbd_get32(header, blocktype)) {
case JBD_DESCRIPTOR_BLOCK:
- ext4_dbg(DEBUG_JBD, "Descriptor block: %u, "
- "trans_id: %u\n",
+ ext4_dbg(DEBUG_JBD, "Descriptor block: %" PRIu32", "
+ "trans_id: %" PRIu32"\n",
this_block, this_trans_id);
- jbd_debug_descriptor_block(jbd_fs, header, &this_block);
+ 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: %u, "
- "trans_id: %u\n",
+ 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: %u, "
- "trans_id: %u\n",
+ ext4_dbg(DEBUG_JBD, "Revoke block: %" PRIu32", "
+ "trans_id: %" PRIu32"\n",
this_block, this_trans_id);
- jbd_build_revoke_root(jbd_fs, header, info);
+ if (action == ACTION_REVOKE) {
+ info->this_trans_id = this_trans_id;
+ jbd_build_revoke_tree(jbd_fs,
+ header, info);
+ }
break;
default:
log_end = true;
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) {
+ jbd_set32(&jbd_fs->sb, start, 0);
+ 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->first);
+ 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->block_size = jbd_get32(&jbd_fs->sb, blocksize);
+
+ TAILQ_INIT(&journal->trans_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 inline bool jbd_has_enough_space(struct jbd_journal *journal,
+ uint32_t blk_cnt)
+{
+ uint32_t new_last = journal->last + blk_cnt;
+ wrap(&journal->jbd_fs->sb, new_last);
+ if (new_last >= journal->start)
+ return false;
+
+ return true;
+}
+
+static uint32_t jbd_journal_alloc_block(struct jbd_journal *journal)
+{
+ uint32_t start_block = journal->last++;
+ wrap(&journal->jbd_fs->sb, journal->last);
+ return start_block;
+}
+
+struct jbd_trans *
+jbd_journal_new_trans()
+{
+ 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.*/
+ return trans;
+}
+
+int jbd_trans_add_block(struct jbd_trans *trans,
+ struct ext4_block *block)
+{
+ struct jbd_buf *buf = calloc(1, sizeof(struct jbd_buf));
+ if (!buf)
+ return ENOMEM;
+
+ buf->trans = trans;
+ buf->block = *block;
+ ext4_bcache_inc_ref(block->buf);
+ trans->buf_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;
+ trans->revoke_cnt++;
+ LIST_INSERT_HEAD(&trans->revoke_list, rec, revoke_node);
+ return EOK;
+}
+
+void jbd_journal_abort_trans(struct jbd_journal *journal,
+ struct jbd_trans *trans)
+{
+ struct jbd_buf *var, *tmp;
+ struct jbd_revoke_rec *rec, *tmp2;
+ LIST_FOREACH_SAFE(var, &trans->buf_list, buf_node,
+ tmp) {
+ ext4_block_set(journal->jbd_fs->bdev, &var->block);
+ LIST_REMOVE(var, buf_node);
+ free(var);
+ }
+ LIST_FOREACH_SAFE(rec, &trans->revoke_list, revoke_node,
+ tmp2) {
+ LIST_REMOVE(rec, revoke_node);
+ free(rec);
+ }
+
+ free(trans);
+}
+
+static void jbd_journal_end_write()
+{
+
+}
+
+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;
+
+ tag_tbl_size = journal->block_size - sizeof(struct jbd_bhdr);
+
+ 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);
+ rc = jbd_block_get_noread(journal->jbd_fs,
+ &desc_block, desc_iblock);
+ if (!rc)
+ break;
+
+ ext4_bcache_set_dirty(desc_block.buf);
+
+ bhdr = (struct jbd_bhdr *)desc_block.data;
+ bhdr->magic = JBD_MAGIC_NUMBER;
+ bhdr->blocktype = JBD_DESCRIPTOR_BLOCK;
+ bhdr->sequence = trans->trans_id;
+ tag_start = (char *)(bhdr + 1);
+ tag_ptr = tag_start;
+ uuid_exist = true;
+ }
+ tag_info.block = jbd_buf->block.lb_id;
+ tag_info.uuid_exist = uuid_exist;
+ if (i == trans->buf_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);
+ 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)
+ jbd_journal_abort_trans(journal, trans);
+
+ if (desc_iblock)
+ jbd_block_set(journal->jbd_fs, &desc_block);
+
+ return rc;
+}
+
+void
+jbd_journal_commit_trans(struct jbd_journal *journal,
+ struct jbd_trans *trans)
+{
+ trans->trans_id = journal->trans_id++;
+ TAILQ_INSERT_TAIL(&journal->trans_queue,
+ trans,
+ trans_node);
+}
+
+/**
+ * @}
+ */
projects / lwext4.git / blobdiff