btrfs: rename EXTENT_BUFFER_NO_CHECK to EXTENT_BUFFER_ZONED_ZEROOUT

EXTENT_BUFFER_ZONED_ZEROOUT better describes the state of the extent buffer,
namely it is written as all zeros. This is needed in zoned mode, to
preserve I/O ordering.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/disk-io.c

@@ -254,7 +254,7 @@ blk_status_t btree_csum_one_bio(struct btrfs_bio *bbio)
 	if (WARN_ON_ONCE(bbio->bio.bi_iter.bi_size != eb->len))
 		return BLK_STS_IOERR;
 
-	if (test_bit(EXTENT_BUFFER_NO_CHECK, &eb->bflags)) {
+	if (test_bit(EXTENT_BUFFER_ZONED_ZEROOUT, &eb->bflags)) {
 		WARN_ON_ONCE(found_start != 0);
 		return BLK_STS_OK;
 	}

fs/btrfs/extent-tree.c

@@ -5061,7 +5061,7 @@ btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 	__btrfs_tree_lock(buf, nest);
 	btrfs_clear_buffer_dirty(trans, buf);
 	clear_bit(EXTENT_BUFFER_STALE, &buf->bflags);
-	clear_bit(EXTENT_BUFFER_NO_CHECK, &buf->bflags);
+	clear_bit(EXTENT_BUFFER_ZONED_ZEROOUT, &buf->bflags);
 
 	set_extent_buffer_uptodate(buf);
 

fs/btrfs/extent_io.c

@@ -4152,7 +4152,7 @@ static void __write_extent_buffer(const struct extent_buffer *eb,
 	/* For unmapped (dummy) ebs, no need to check their uptodate status. */
 	const bool check_uptodate = !test_bit(EXTENT_BUFFER_UNMAPPED, &eb->bflags);
 
-	WARN_ON(test_bit(EXTENT_BUFFER_NO_CHECK, &eb->bflags));
+	WARN_ON(test_bit(EXTENT_BUFFER_ZONED_ZEROOUT, &eb->bflags));
 
 	if (check_eb_range(eb, start, len))
 		return;

fs/btrfs/extent_io.h

@@ -28,7 +28,8 @@ enum {
 	EXTENT_BUFFER_IN_TREE,
 	/* write IO error */
 	EXTENT_BUFFER_WRITE_ERR,
-	EXTENT_BUFFER_NO_CHECK,
+	/* Indicate the extent buffer is written zeroed out (for zoned) */
+	EXTENT_BUFFER_ZONED_ZEROOUT,
 	/* Indicate that extent buffer pages a being read */
 	EXTENT_BUFFER_READING,
 };

fs/btrfs/zoned.c

@@ -1716,7 +1716,7 @@ void btrfs_redirty_list_add(struct btrfs_transaction *trans,
 	ASSERT(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
 
 	memzero_extent_buffer(eb, 0, eb->len);
-	set_bit(EXTENT_BUFFER_NO_CHECK, &eb->bflags);
+	set_bit(EXTENT_BUFFER_ZONED_ZEROOUT, &eb->bflags);
 	set_extent_buffer_dirty(eb);
 	set_extent_bit(&trans->dirty_pages, eb->start, eb->start + eb->len - 1,
 			EXTENT_DIRTY, NULL);