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dump: simplify get_len_buf_out() 

We can (and should) rely on the fact that s->flag_compress is exactly one
of DUMP_DH_COMPRESSED_ZLIB, DUMP_DH_COMPRESSED_LZO, and
DUMP_DH_COMPRESSED_SNAPPY.

This is ensured by the QMP schema and dump_init() in combination.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
This commit is contained in:
Laszlo Ersek 2014-05-20 13:42:53 +02:00 committed by Luiz Capitulino
parent c998acb03d
commit b87ef3518b
1 changed files with 15 additions and 29 deletions
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44
dump.c
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@ -1220,35 +1220,24 @@ static void free_data_cache(DataCache *data_cache)
static size_t get_len_buf_out(size_t page_size, uint32_t flag_compress)
{
size_t len_buf_out_zlib, len_buf_out_lzo, len_buf_out_snappy;
size_t len_buf_out;
switch (flag_compress) {
case DUMP_DH_COMPRESSED_ZLIB:
return compressBound(page_size);
/* init buf_out */
len_buf_out_zlib = len_buf_out_lzo = len_buf_out_snappy = 0;
/* buf size for zlib */
len_buf_out_zlib = compressBound(page_size);
/* buf size for lzo */
#ifdef CONFIG_LZO
/*
* LZO will expand incompressible data by a little amount. please check the
* following URL to see the expansion calculation:
* http://www.oberhumer.com/opensource/lzo/lzofaq.php
*/
len_buf_out_lzo = page_size + page_size / 16 + 64 + 3;
#endif
case DUMP_DH_COMPRESSED_LZO:
/*
* LZO will expand incompressible data by a little amount. Please check
* the following URL to see the expansion calculation:
* http://www.oberhumer.com/opensource/lzo/lzofaq.php
*/
return page_size + page_size / 16 + 64 + 3;
#ifdef CONFIG_SNAPPY
/* buf size for snappy */
len_buf_out_snappy = snappy_max_compressed_length(page_size);
case DUMP_DH_COMPRESSED_SNAPPY:
return snappy_max_compressed_length(page_size);
#endif
/* get the biggest that can store all kinds of compressed page */
len_buf_out = MAX(len_buf_out_zlib,
MAX(len_buf_out_lzo, len_buf_out_snappy));
return len_buf_out;
}
return 0;
}
/*
@ -1284,10 +1273,7 @@ static int write_dump_pages(DumpState *s)
/* prepare buffer to store compressed data */
len_buf_out = get_len_buf_out(TARGET_PAGE_SIZE, s->flag_compress);
if (len_buf_out == 0) {
dump_error(s, "dump: failed to get length of output buffer.\n");
goto out;
}
assert(len_buf_out != 0);
#ifdef CONFIG_LZO
wrkmem = g_malloc(LZO1X_1_MEM_COMPRESS);