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Btrfs: wait on async pages when shrinking delalloc
Mitch reported a problem where you could get an ENOSPC error when untarring a kernel git tree onto a 16gb file system with compress-force=zlib. This is because compression is a huge pain, it will return from ->writepages() without having actually created any ordered extents. To get around this we check to see if the async submit counter is up, and if it is wait until it drops to 0 before doing our normal ordered wait dance. With this patch I can now untar a kernel git tree onto a 16gb file system without getting ENOSPC errors. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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@ -3697,6 +3697,13 @@ static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig,
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writeback_inodes_sb_nr_if_idle(root->fs_info->sb, nr_pages,
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WB_REASON_FS_FREE_SPACE);
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/*
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* We need to wait for the async pages to actually start before
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* we do anything.
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*/
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wait_event(root->fs_info->async_submit_wait,
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!atomic_read(&root->fs_info->async_delalloc_pages));
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spin_lock(&space_info->lock);
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if (space_info->bytes_used + space_info->bytes_reserved +
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space_info->bytes_pinned + space_info->bytes_readonly +
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