[systemd-devel] [PATCH] journal/compress: use LZ4_compress_continue()
Evangelos Foutras
evangelos at foutrelis.com
Sat Aug 30 00:13:43 PDT 2014
We can't use LZ4_compress_limitedOutput_continue() because in the
worst-case scenario the compressed output can be slightly bigger than
the input block. This generally affects very few blocks and is no reason
to abort the compression process.
I ran into this when I noticed that Chromium core dumps weren't being
compressed. After switching to LZ4_compress_continue() a ~330MB Chromium
core dump gets compressed to ~17M.
---
src/journal/compress.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/src/journal/compress.c b/src/journal/compress.c
index 52a4c10..c4c715b 100644
--- a/src/journal/compress.c
+++ b/src/journal/compress.c
@@ -460,10 +460,10 @@ int compress_stream_lz4(int fdf, int fdt, off_t max_bytes) {
total_in += n;
- r = LZ4_compress_limitedOutput_continue(&lz4_data, buf, out, n, n);
+ r = LZ4_compress_continue(&lz4_data, buf, out, n);
if (r == 0) {
- log_debug("Compressed size exceeds original, aborting compression.");
- return -ENOBUFS;
+ log_error("LZ4 compression failed.");
+ return -EBADMSG;
}
header = htole32(r);
--
2.1.0
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