6.6-stable review patch. If anyone has any objections, please let me know.
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From: Filipe Manana fdmanana@suse.com
commit 4c782247b89376a83fa132f7d45d6977edae0629 upstream.
At close_ctree() after we have ran delayed iputs either through explicitly calling btrfs_run_delayed_iputs() or later during the call to btrfs_commit_super() or btrfs_error_commit_super(), we assert that the delayed iputs list is empty.
When we have compressed writes this assertion may fail because delayed iputs may have been added to the list after we last ran delayed iputs. This happens like this:
1) We have a compressed write bio executing;
2) We enter close_ctree() and flush the fs_info->endio_write_workers queue which is the queue used for running ordered extent completion;
3) The compressed write bio finishes and enters btrfs_finish_compressed_write_work(), where it calls btrfs_finish_ordered_extent() which in turn calls btrfs_queue_ordered_fn(), which queues a work item in the fs_info->endio_write_workers queue that we have flushed before;
4) At close_ctree() we proceed, run all existing delayed iputs and call btrfs_commit_super() (which also runs delayed iputs), but before we run the following assertion below:
ASSERT(list_empty(&fs_info->delayed_iputs))
A delayed iput is added by the step below...
5) The ordered extent completion job queued in step 3 runs and results in creating a delayed iput when dropping the last reference of the ordered extent (a call to btrfs_put_ordered_extent() made from btrfs_finish_one_ordered());
6) At this point the delayed iputs list is not empty, so the assertion at close_ctree() fails.
Fix this by flushing the fs_info->compressed_write_workers queue at close_ctree() before flushing the fs_info->endio_write_workers queue, respecting the queue dependency as the later is responsible for the execution of ordered extent completion.
CC: stable@vger.kernel.org # 5.15+ Reviewed-by: Qu Wenruo wqu@suse.com Signed-off-by: Filipe Manana fdmanana@suse.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/btrfs/disk-io.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
--- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -4334,6 +4334,18 @@ void __cold close_ctree(struct btrfs_fs_ btrfs_flush_workqueue(fs_info->delalloc_workers);
/* + * When finishing a compressed write bio we schedule a work queue item + * to finish an ordered extent - btrfs_finish_compressed_write_work() + * calls btrfs_finish_ordered_extent() which in turns does a call to + * btrfs_queue_ordered_fn(), and that queues the ordered extent + * completion either in the endio_write_workers work queue or in the + * fs_info->endio_freespace_worker work queue. We flush those queues + * below, so before we flush them we must flush this queue for the + * workers of compressed writes. + */ + flush_workqueue(fs_info->compressed_write_workers); + + /* * After we parked the cleaner kthread, ordered extents may have * completed and created new delayed iputs. If one of the async reclaim * tasks is running and in the RUN_DELAYED_IPUTS flush state, then we