linux-kernel - [PATCH 4.13 100/110] btrfs: finish ordered extent cleaning if no progress is found

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Message-Id: <20171003114245.282967724@linuxfoundation.org>
Date:   Tue,  3 Oct 2017 14:30:02 +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, Naohiro Aota <naohiro.aota@....com>,
        Qu Wenruo <quwenruo.btrfs@....com>,
        Josef Bacik <jbacik@...com>, David Sterba <dsterba@...e.com>
Subject: [PATCH 4.13 100/110] btrfs: finish ordered extent cleaning if no progress is found

4.13-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Naohiro Aota <naohiro.aota@....com>

commit 67c003f90fd68062d92a7ffade36f9b2a9098bd8 upstream.

__endio_write_update_ordered() repeats the search until it reaches the end
of the specified range. This works well with direct IO path, because before
the function is called, it's ensured that there are ordered extents filling
whole the range. It's not the case, however, when it's called from
run_delalloc_range(): it is possible to have error in the midle of the loop
in e.g. run_delalloc_nocow(), so that there exisits the range not covered
by any ordered extents. By cleaning such "uncomplete" range,
__endio_write_update_ordered() stucks at offset where there're no ordered
extents.

Since the ordered extents are created from head to tail, we can stop the
search if there are no offset progress.

Fixes: 524272607e88 ("btrfs: Handle delalloc error correctly to avoid ordered extent hang")
Signed-off-by: Naohiro Aota <naohiro.aota@....com>
Reviewed-by: Qu Wenruo <quwenruo.btrfs@....com>
Reviewed-by: Josef Bacik <jbacik@...com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/btrfs/inode.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -8309,6 +8309,7 @@ static void __endio_write_update_ordered
 	btrfs_work_func_t func;
 	u64 ordered_offset = offset;
 	u64 ordered_bytes = bytes;
+	u64 last_offset;
 	int ret;
 
 	if (btrfs_is_free_space_inode(BTRFS_I(inode))) {
@@ -8320,6 +8321,7 @@ static void __endio_write_update_ordered
 	}
 
 again:
+	last_offset = ordered_offset;
 	ret = btrfs_dec_test_first_ordered_pending(inode, &ordered,
 						   &ordered_offset,
 						   ordered_bytes,
@@ -8331,6 +8333,12 @@ again:
 	btrfs_queue_work(wq, &ordered->work);
 out_test:
 	/*
+	 * If btrfs_dec_test_ordered_pending does not find any ordered extent
+	 * in the range, we can exit.
+	 */
+	if (ordered_offset == last_offset)
+		return;
+	/*
 	 * our bio might span multiple ordered extents.  If we haven't
 	 * completed the accounting for the whole dio, go back and try again
 	 */