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1 files changed, 124 insertions, 0 deletions

diff --git a/src/ext4_trans.c b/src/ext4_trans.c
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+++ b/src/ext4_trans.c
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+/*
+ * 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_trans.c
+ * @brief Ext4 transaction buffer operations.
+ */
+
+#include "ext4_config.h"
+#include "ext4_types.h"
+#include "ext4_journal.h"
+
+static int ext4_trans_get_write_access(struct ext4_fs *fs __unused,
+				struct ext4_block *block __unused)
+{
+	int r = EOK;
+#if CONFIG_JOURNALING_ENABLE
+	if (fs->jbd_journal && fs->curr_trans) {
+		struct jbd_journal *journal = fs->jbd_journal;
+		struct jbd_trans *trans = fs->curr_trans;
+		r = jbd_trans_get_access(journal, trans, block);
+	}
+#endif
+	return r;
+}
+
+int ext4_trans_set_block_dirty(struct ext4_buf *buf)
+{
+	int r = EOK;
+#if CONFIG_JOURNALING_ENABLE
+	struct ext4_fs *fs = buf->bc->bdev->fs;
+	struct ext4_block block = {
+		.lb_id = buf->lba,
+		.data = buf->data,
+		.buf = buf
+	};
+
+	if (fs->jbd_journal && fs->curr_trans) {
+		struct jbd_trans *trans = fs->curr_trans;
+		return jbd_trans_set_block_dirty(trans, &block);
+	}
+#endif
+	ext4_bcache_set_dirty(buf);
+	return r;
+}
+
+int ext4_trans_block_get_noread(struct ext4_blockdev *bdev,
+			  struct ext4_block *b,
+			  uint64_t lba)
+{
+	int r = ext4_block_get_noread(bdev, b, lba);
+	if (r != EOK)
+		return r;
+
+	r = ext4_trans_get_write_access(bdev->fs, b);
+	if (r != EOK)
+		ext4_block_set(bdev, b);
+
+	return r;
+}
+
+int ext4_trans_block_get(struct ext4_blockdev *bdev,
+		   struct ext4_block *b,
+		   uint64_t lba)
+{
+	int r = ext4_block_get(bdev, b, lba);
+	if (r != EOK)
+		return r;
+
+	r = ext4_trans_get_write_access(bdev->fs, b);
+	if (r != EOK)
+		ext4_block_set(bdev, b);
+
+	return r;
+}
+
+int ext4_trans_try_revoke_block(struct ext4_blockdev *bdev __unused,
+			        uint64_t lba __unused)
+{
+	int r = EOK;
+#if CONFIG_JOURNALING_ENABLE
+	struct ext4_fs *fs = bdev->fs;
+	if (fs->jbd_journal && fs->curr_trans) {
+		struct jbd_trans *trans = fs->curr_trans;
+		r = jbd_trans_try_revoke_block(trans, lba);
+	} else if (fs->jbd_journal) {
+		r = ext4_block_flush_lba(fs->bdev, lba);
+	}
+#endif
+	return r;
+}
+
+/**
+ * @}
+ */