Btrfs: fix race setting block group back to RW mode during device replace
After it finishes processing a device extent, the device replace code sets back the block group to RW mode and then after that it sets the left cursor to match the logical end address of the block group, so that future writes into extents belonging to the block group go both the source (old) and target (new) devices. However from the moment we turn the block group back to RW mode we have a short time window, that lasts until we update the left cursor's value, where extents can be allocated from the block group and written to, in which case they will not be copied/written to the target (new) device. Fix this by updating the left cursor's value before turning the block group back to RW mode. Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: Josef Bacik <jbacik@fb.com>
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@ -3682,6 +3682,11 @@ int scrub_enumerate_chunks(struct scrub_ctx *sctx,
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scrub_pause_off(fs_info);
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btrfs_dev_replace_lock(&fs_info->dev_replace, 1);
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dev_replace->cursor_left = dev_replace->cursor_right;
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dev_replace->item_needs_writeback = 1;
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btrfs_dev_replace_unlock(&fs_info->dev_replace, 1);
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if (ro_set)
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btrfs_dec_block_group_ro(root, cache);
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@ -3719,11 +3724,6 @@ int scrub_enumerate_chunks(struct scrub_ctx *sctx,
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ret = -ENOMEM;
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break;
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}
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btrfs_dev_replace_lock(&fs_info->dev_replace, 1);
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dev_replace->cursor_left = dev_replace->cursor_right;
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dev_replace->item_needs_writeback = 1;
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btrfs_dev_replace_unlock(&fs_info->dev_replace, 1);
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skip:
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key.offset = found_key.offset + length;
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btrfs_release_path(path);
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