migration/compress: compress QEMUFile is not writable
We open a file with empty_ops for compress QEMUFile, which means this is not writable. Signed-off-by: Wei Yang <richardw.yang@linux.intel.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
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@ -764,11 +764,8 @@ static int qemu_compress_data(z_stream *stream, uint8_t *dest, size_t dest_len,
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/* Compress size bytes of data start at p and store the compressed
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* data to the buffer of f.
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*
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* When f is not writable, return -1 if f has no space to save the
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* compressed data.
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* When f is wirtable and it has no space to save the compressed data,
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* do fflush first, if f still has no space to save the compressed
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* data, return -1.
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* Since the file is dummy file with empty_ops, return -1 if f has no space to
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* save the compressed data.
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*/
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ssize_t qemu_put_compression_data(QEMUFile *f, z_stream *stream,
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const uint8_t *p, size_t size)
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@ -776,14 +773,7 @@ ssize_t qemu_put_compression_data(QEMUFile *f, z_stream *stream,
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ssize_t blen = IO_BUF_SIZE - f->buf_index - sizeof(int32_t);
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if (blen < compressBound(size)) {
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if (!qemu_file_is_writable(f)) {
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return -1;
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}
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qemu_fflush(f);
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blen = IO_BUF_SIZE - sizeof(int32_t);
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if (blen < compressBound(size)) {
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return -1;
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}
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return -1;
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}
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blen = qemu_compress_data(stream, f->buf + f->buf_index + sizeof(int32_t),
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