Store store compression status in the store header - dedup - deduplicating backup program
HTML git clone git://bitreich.org/dedup/ git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/dedup/
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---
DIR commit 13bf2f947a35134d17043151e3a07f7aa86155b1
DIR parent bea0c2a2d0e5dd3b04fd7888bcaf6ab3eb87fa79
HTML Author: sin <sin@2f30.org>
Date: Sun, 3 Mar 2019 13:24:04 +0000
Store store compression status in the store header
Diffstat:
M dedup.c | 10 ++++++++++
M dedup.h | 3 +++
2 files changed, 13 insertions(+), 0 deletions(-)
---
DIR diff --git a/dedup.c b/dedup.c
@@ -511,15 +511,25 @@ static void
init_blk_hdr(void)
{
blk_hdr.flags = (VER_MAJ << VER_MAJ_SHIFT) | VER_MIN;
+ blk_hdr.flags |= compr_enabled << COMPR_ENABLED_SHIFT;
blk_hdr.size = BLK_HDR_SIZE;
}
static void
load_blk_hdr(void)
{
+ uint64_t v;
+
xlseek(sfd, 0, SEEK_SET);
read_blk_hdr(sfd, &blk_hdr);
match_ver(blk_hdr.flags);
+
+ v = blk_hdr.flags >> COMPR_ENABLED_SHIFT;
+ v &= COMPR_ENABLED_MASK;
+ if (v != compr_enabled)
+ errx(1, "store is %s but dedup was invoked %s",
+ v ? "compressed" : "not compressed",
+ compr_enabled ? "with compression" : "without compression");
}
static void
DIR diff --git a/dedup.h b/dedup.h
@@ -23,6 +23,9 @@
#define VER_MAJ_SHIFT 8
#define VER_MAJ_MASK 0xff
+#define COMPR_ENABLED_SHIFT 16
+#define COMPR_ENABLED_MASK 0x1
+
struct cache;
struct chunker;