shithub: lwext4

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ext4_journal: add jbd_trans_try_revoke_block routine.

--- a/lwext4/ext4_journal.c

+++ b/lwext4/ext4_journal.c

@@ -1222,6 +1222,28 @@

 	return EOK;

 }

+/**@brief  Try to add block to be revoked to a transaction.

+ *         If @lba still remains in an transaction on checkpoint

+ *         queue, add @lba as a revoked block to the transaction.

+ * @param  trans transaction

+ * @param  lba logical block address

+ * @return standard error code*/

+int jbd_trans_try_revoke_block(struct jbd_trans *trans,

+			       ext4_fsblk_t lba)

+{

+	int r = EOK;

+	struct jbd_trans *tmp;

+	struct jbd_journal *journal = trans->journal;

+	TAILQ_FOREACH(tmp, &journal->cp_queue, trans_node) {

+		struct jbd_block_rec *block_rec =

+			jbd_trans_block_rec_lookup(trans, lba);

+		if (block_rec)

+			jbd_trans_revoke_block(trans, lba);

+

+	}

+	return r;

+}

+

 /**@brief  Free a transaction

  * @param  journal current journal session

  * @param  trans transaction

--- a/lwext4/ext4_journal.h

+++ b/lwext4/ext4_journal.h

@@ -62,6 +62,8 @@

 			      struct ext4_block *block);

 int jbd_trans_revoke_block(struct jbd_trans *trans,

 			   ext4_fsblk_t lba);

+int jbd_trans_try_revoke_block(struct jbd_trans *trans,

+			       ext4_fsblk_t lba);

 void jbd_journal_free_trans(struct jbd_journal *journal,

 			    struct jbd_trans *trans,

 			    bool abort);