ref: 4b25da872742a15a49343f758e16d5e0447d1c48
parent: 1036491516a43cd82a7c4e305abfb4a1bc7acf33
author: ngkaho1234 <[email protected]>
date: Tue Dec 8 09:45:37 EST 2015
ext4_journal: journal write skeleton code.
--- a/lwext4/ext4_journal.c
+++ b/lwext4/ext4_journal.c
@@ -130,6 +130,19 @@
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)
{@@ -163,11 +176,10 @@
int jbd_put_fs(struct jbd_fs *jbd_fs)
{- int rc;
- if (jbd_fs->dirty)
- jbd_sb_write(jbd_fs, &jbd_fs->sb);
+ int rc = EOK;
+ rc = jbd_write_sb(jbd_fs);
- rc = ext4_fs_put_inode_ref(&jbd_fs->inode_ref);
+ ext4_fs_put_inode_ref(&jbd_fs->inode_ref);
return rc;
}
@@ -248,64 +260,150 @@
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_get16(tag, flags) & JBD_FLAG_ESCAPE)
- *block = 0;
+ 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;
- *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_get16(tag, flags) & JBD_FLAG_LAST_TAG)
- *last_tag = true;
+ 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,
@@ -313,9 +411,8 @@
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;
@@ -325,26 +422,24 @@
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;
}
}
@@ -663,6 +758,215 @@
}
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);
}
/**
--- a/lwext4/ext4_types.h
+++ b/lwext4/ext4_types.h
@@ -1095,17 +1095,23 @@
struct jbd_buf {struct ext4_block block;
- struct ext4_block block_jbd;
-
struct jbd_trans *trans;
-
LIST_ENTRY(jbd_buf) buf_node;
};
+struct jbd_revoke_rec {+ ext4_fsblk_t lba;
+ LIST_ENTRY(jbd_revoke_rec) revoke_node;
+};
+
struct jbd_trans {uint32_t trans_id;
+
+ int buf_cnt;
+ int revoke_cnt;
LIST_HEAD(jbd_trans_buf, jbd_buf) buf_list;
- LIST_ENTRY(jbd_trans) trans_node;
+ LIST_HEAD(jbd_revoke_list, jbd_revoke_rec) revoke_list;
+ TAILQ_ENTRY(jbd_trans) trans_node;
};
struct jbd_journal {@@ -1112,10 +1118,11 @@
uint32_t first;
uint32_t start;
uint32_t last;
- uint32_t first_trans_id;
- uint32_t last_trans_id;
+ uint32_t trans_id;
- LIST_HEAD(jbd_trans_list, jbd_trans) trans_list;
+ uint32_t block_size;
+
+ TAILQ_HEAD(jbd_trans_queue, jbd_trans) trans_queue;
struct jbd_fs *jbd_fs;
};