From d1afbcd22170e95c79261340071d376fe41fc3af Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Sat, 24 Oct 2015 13:17:54 +0200
Subject: journal: fix error handling when compressing journal objects

Let's make sure we handle compression errors properly, and don't
misunderstand an error for success.

Also, let's actually compress things if lz4 is enabled.

Fixes #1662.
---
 src/journal/journal-file.c | 11 ++++++-----
 src/journal/journal-file.h |  5 +++++
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/src/journal/journal-file.c b/src/journal/journal-file.c
index 1071c6d6d7..89068f26d2 100644
--- a/src/journal/journal-file.c
+++ b/src/journal/journal-file.c
@@ -1076,23 +1076,24 @@ static int journal_file_append_data(
         o->data.hash = htole64(hash);
 
 #if defined(HAVE_XZ) || defined(HAVE_LZ4)
-        if (f->compress_xz &&
-            size >= COMPRESSION_SIZE_THRESHOLD) {
+        if (JOURNAL_FILE_COMPRESS(f) && size >= COMPRESSION_SIZE_THRESHOLD) {
                 size_t rsize = 0;
 
                 compression = compress_blob(data, size, o->data.payload, &rsize);
 
-                if (compression) {
+                if (compression >= 0) {
                         o->object.size = htole64(offsetof(Object, data.payload) + rsize);
                         o->object.flags |= compression;
 
                         log_debug("Compressed data object %"PRIu64" -> %zu using %s",
                                   size, rsize, object_compressed_to_string(compression));
-                }
+                } else
+                        /* Compression didn't work, we don't really care why, let's continue without compression */
+                        compression = 0;
         }
 #endif
 
-        if (!compression && size > 0)
+        if (compression == 0 && size > 0)
                 memcpy(o->data.payload, data, size);
 
         r = journal_file_link_data(f, o, p, hash);
diff --git a/src/journal/journal-file.h b/src/journal/journal-file.h
index f2c07356c8..898d12d992 100644
--- a/src/journal/journal-file.h
+++ b/src/journal/journal-file.h
@@ -235,3 +235,8 @@ bool journal_file_rotate_suggested(JournalFile *f, usec_t max_file_usec);
 
 int journal_file_map_data_hash_table(JournalFile *f);
 int journal_file_map_field_hash_table(JournalFile *f);
+
+static inline bool JOURNAL_FILE_COMPRESS(JournalFile *f) {
+        assert(f);
+        return f->compress_xz || f->compress_lz4;
+}
-- 
cgit v1.2.3-54-g00ecf


From 0240c603691e006165d8687d6a2c70859755b11f Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Sat, 24 Oct 2015 15:08:15 +0200
Subject: journal: irrelevant coding style fixes

---
 src/journal/compress.c     | 9 +++++----
 src/journal/journal-file.c | 2 +-
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/journal/compress.c b/src/journal/compress.c
index 8c92e26edd..fb40bed594 100644
--- a/src/journal/compress.c
+++ b/src/journal/compress.c
@@ -57,10 +57,11 @@ int compress_blob_xz(const void *src, uint64_t src_size, void *dst, size_t *dst_
 #ifdef HAVE_XZ
         static const lzma_options_lzma opt = {
                 1u << 20u, NULL, 0, LZMA_LC_DEFAULT, LZMA_LP_DEFAULT,
-                LZMA_PB_DEFAULT, LZMA_MODE_FAST, 128, LZMA_MF_HC3, 4};
-        static const lzma_filter filters[2] = {
-                {LZMA_FILTER_LZMA2, (lzma_options_lzma*) &opt},
-                {LZMA_VLI_UNKNOWN, NULL}
+                LZMA_PB_DEFAULT, LZMA_MODE_FAST, 128, LZMA_MF_HC3, 4
+        };
+        static const lzma_filter filters[] = {
+                { LZMA_FILTER_LZMA2, (lzma_options_lzma*) &opt },
+                { LZMA_VLI_UNKNOWN, NULL }
         };
         lzma_ret ret;
         size_t out_pos = 0;
diff --git a/src/journal/journal-file.c b/src/journal/journal-file.c
index 89068f26d2..fadc0e4286 100644
--- a/src/journal/journal-file.c
+++ b/src/journal/journal-file.c
@@ -1057,7 +1057,7 @@ static int journal_file_append_data(
         r = journal_file_find_data_object_with_hash(f, data, size, hash, &o, &p);
         if (r < 0)
                 return r;
-        else if (r > 0) {
+        if (r > 0) {
 
                 if (ret)
                         *ret = o;
-- 
cgit v1.2.3-54-g00ecf