migration: Remove non-multifd compression

The 'compress' migration capability enables the old compression code
which has shown issues over the years and is thought to be less stable
and tested than the more recent multifd-based compression. The old
compression code has been deprecated in 8.2 and now is time to remove
it.

Deprecation commit 864128df46 ("migration: Deprecate old compression
method").

Acked-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>

1 files changed, 0 insertions, 78 deletions

diff --git a/migration/qemu-file.c b/migration/qemu-file.c
index a10882d47f..9ccbbb0099 100644
--- a/migration/qemu-file.c
+++ b/migration/qemu-file.c
@@ -778,84 +778,6 @@ uint64_t qemu_get_be64(QEMUFile *f)
     return v;
 }
 
-/* return the size after compression, or negative value on error */
-static int qemu_compress_data(z_stream *stream, uint8_t *dest, size_t dest_len,
-                              const uint8_t *source, size_t source_len)
-{
-    int err;
-
-    err = deflateReset(stream);
-    if (err != Z_OK) {
-        return -1;
-    }
-
-    stream->avail_in = source_len;
-    stream->next_in = (uint8_t *)source;
-    stream->avail_out = dest_len;
-    stream->next_out = dest;
-
-    err = deflate(stream, Z_FINISH);
-    if (err != Z_STREAM_END) {
-        return -1;
-    }
-
-    return stream->next_out - dest;
-}
-
-/* Compress size bytes of data start at p and store the compressed
- * data to the buffer of f.
- *
- * Since the file is dummy file with empty_ops, return -1 if f has no space to
- * save the compressed data.
- */
-ssize_t qemu_put_compression_data(QEMUFile *f, z_stream *stream,
-                                  const uint8_t *p, size_t size)
-{
-    ssize_t blen = IO_BUF_SIZE - f->buf_index - sizeof(int32_t);
-
-    if (blen < compressBound(size)) {
-        return -1;
-    }
-
-    blen = qemu_compress_data(stream, f->buf + f->buf_index + sizeof(int32_t),
-                              blen, p, size);
-    if (blen < 0) {
-        return -1;
-    }
-
-    qemu_put_be32(f, blen);
-    add_buf_to_iovec(f, blen);
-    return blen + sizeof(int32_t);
-}
-
-/* Put the data in the buffer of f_src to the buffer of f_des, and
- * then reset the buf_index of f_src to 0.
- */
-
-int qemu_put_qemu_file(QEMUFile *f_des, QEMUFile *f_src)
-{
-    int len = 0;
-
-    if (f_src->buf_index > 0) {
-        len = f_src->buf_index;
-        qemu_put_buffer(f_des, f_src->buf, f_src->buf_index);
-        f_src->buf_index = 0;
-        f_src->iovcnt = 0;
-    }
-    return len;
-}
-
-/*
- * Check if the writable buffer is empty
- */
-
-bool qemu_file_buffer_empty(QEMUFile *file)
-{
-    assert(qemu_file_is_writable(file));
-
-    return !file->iovcnt;
-}
-
 /*
  * Get a string whose length is determined by a single preceding byte
  * A preallocated 256 byte buffer must be passed in.