linux-kernel - [PATCH 5.2 285/313] btrfs: adjust dirty_metadata_bytes after writeback failure of extent buffer

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Message-Id: <20191003154601.153892981@linuxfoundation.org>
Date:   Thu,  3 Oct 2019 17:54:23 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Filipe Manana <fdmanana@...nel.org>,
        Dennis Zhou <dennis@...nel.org>,
        David Sterba <dsterba@...e.com>
Subject: [PATCH 5.2 285/313] btrfs: adjust dirty_metadata_bytes after writeback failure of extent buffer

From: Dennis Zhou <dennis@...nel.org>

commit eb5b64f142504a597d67e2109d603055ff765e52 upstream.

Before, if a eb failed to write out, we would end up triggering a
BUG_ON(). As of f4340622e0226 ("btrfs: extent_io: Move the BUG_ON() in
flush_write_bio() one level up"), we no longer BUG_ON(), so we should
make life consistent and add back the unwritten bytes to
dirty_metadata_bytes.

Fixes: f4340622e022 ("btrfs: extent_io: Move the BUG_ON() in flush_write_bio() one level up")
CC: stable@...r.kernel.org # 5.2+
Reviewed-by: Filipe Manana <fdmanana@...nel.org>
Signed-off-by: Dennis Zhou <dennis@...nel.org>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/btrfs/extent_io.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3708,12 +3708,21 @@ err_unlock:
 static void set_btree_ioerr(struct page *page)
 {
 	struct extent_buffer *eb = (struct extent_buffer *)page->private;
+	struct btrfs_fs_info *fs_info;
 
 	SetPageError(page);
 	if (test_and_set_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags))
 		return;
 
 	/*
+	 * If we error out, we should add back the dirty_metadata_bytes
+	 * to make it consistent.
+	 */
+	fs_info = eb->fs_info;
+	percpu_counter_add_batch(&fs_info->dirty_metadata_bytes,
+				 eb->len, fs_info->dirty_metadata_batch);
+
+	/*
 	 * If writeback for a btree extent that doesn't belong to a log tree
 	 * failed, increment the counter transaction->eb_write_errors.
 	 * We do this because while the transaction is running and before it's