ref: 093f60969f083427b5354ba3344297b6194ed106
parent: 4b25da872742a15a49343f758e16d5e0447d1c48
author: ngkaho1234 <ngkaho1234@gmail.com>
date: Tue Dec 8 10:58:33 EST 2015
ext4_journal: journal write skeleton code part 2.
--- a/lwext4/ext4_journal.c
+++ b/lwext4/ext4_journal.c
@@ -887,8 +887,6 @@
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;
@@ -907,9 +905,12 @@
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_tbl_size = journal->block_size -
+ sizeof(struct jbd_bhdr);
}
tag_info.block = jbd_buf->block.lb_id;
tag_info.uuid_exist = uuid_exist;
@@ -955,6 +956,80 @@
if (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;
+ 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(rec, &trans->revoke_list, revoke_node) {+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_REVOKE_BLOCK;
+ 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_bhdr);
+ }
+
+ if (tag_tbl_size < record_len) {+ 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)
+ jbd_journal_abort_trans(journal, trans);
+
+ if (desc_iblock) {+ if (header != NULL)
+ header->count = journal->block_size - tag_tbl_size;
+
+ jbd_block_set(journal->jbd_fs, &desc_block);
+ }
return rc;
}