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btrfs: send: handle unexpected data in header buffer in begin_cmd()
Change BUG_ON to a proper error handling in the unlikely case of seeing data when the command is started. This is supposed to be reset when the command is finished (send_cmd, send_encoded_extent). Signed-off-by: David Sterba <dsterba@suse.com>
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@ -776,7 +776,12 @@ static int begin_cmd(struct send_ctx *sctx, int cmd)
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if (WARN_ON(!sctx->send_buf))
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return -EINVAL;
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BUG_ON(sctx->send_size);
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if (unlikely(sctx->send_size != 0)) {
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btrfs_err(sctx->send_root->fs_info,
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"send: command header buffer not empty cmd %d offset %llu",
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cmd, sctx->send_off);
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return -EINVAL;
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}
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sctx->send_size += sizeof(*hdr);
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hdr = (struct btrfs_cmd_header *)sctx->send_buf;
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