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lib/reduce: conditionally memcpy data to host follow decompression

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If the decompression code path runs into a chunk that wasn't
compressed, the data needs to be copied to the host as the
compression engine was not engaged.

Signed-off-by: paul luse <paul.e.luse@intel.com>
Change-Id: Ibabd6d6bd2bc5db79953a0a55d7f49d556c08af7
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/462892
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
This commit is contained in:
paul luse 2019-07-22 13:56:11 -04:00 committed by Jim Harris
parent 0242a80793
commit 907ec7268d
1 changed files with 14 additions and 0 deletions
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14
lib/reduce/reduce.c
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@ -1273,6 +1273,9 @@ static void
_read_read_done(void *_req, int reduce_errno)
{
struct spdk_reduce_vol_request *req = _req;
uint64_t chunk_offset;
uint8_t *buf;
int i;
if (reduce_errno != 0) {
req->reduce_errno = reduce_errno;
@ -1291,6 +1294,17 @@ _read_read_done(void *_req, int reduce_errno)
if (req->chunk_is_compressed) {
_reduce_vol_decompress_chunk(req, _read_decompress_done);
} else {
/* If the chunk was compressed, the data would have been sent to the
* host buffers by the decompression operation, if not we need to memcpy here.
*/
chunk_offset = req->offset % req->vol->logical_blocks_per_chunk;
buf = req->decomp_buf + chunk_offset * req->vol->params.logical_block_size;
for (i = 0; i < req->iovcnt; i++) {
memcpy(req->iov[i].iov_base, buf, req->iov[i].iov_len);
buf += req->iov[i].iov_len;
}
_read_decompress_done(req, req->chunk->compressed_size);
}
}