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From:   Christoph Hellwig <hch@lst.de>
To:     David Sterba <dsterba@suse.com>,
        Josef Bacik <josef@toxicpanda.com>, Qu Wenruo <wqu@suse.com>
Cc:     linux-btrfs@vger.kernel.org
Subject: cleanup btrfs bio handling, part 2 v4
Date:   Thu, 26 May 2022 09:36:32 +0200
Message-Id: <20220526073642.1773373-1-hch@lst.de>
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Hi all,

this series removes the need to allocate a separate object for I/O
completions for all read and some write I/Os, and reduced the memory
usage of the low-level bios cloned by btrfs_map_bio by using plain bios
instead of the much larger btrfs_bio.

Changes since v3:
 - rebased to the latest for-next tree
 - move "btrfs: don't double-defer bio completions for compressed reads"
   back to where it was before in the patch order

Changes since v2:
 - rebased to the latests misc-next tree
 - fixed an incorrectly assigned bi_end_io handler in the raid56 code

Changes since v1:
 - rebased to the latests misc-next tree
 - don't call destroy_workqueue on NULL workqueues
 - drop a marginal and slightly controversial cleanup to btrfs_map_bio

Diffstat: