Rework types - dedup - deduplicating backup program
(HTM) git clone git://bitreich.org/dedup/ git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/dedup/
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---
(DIR) commit ec64133a5a57e21b3565368df37eae469c260755
(DIR) parent 4029c846bc6e9b84ba02740fecae68cd8232c765
(HTM) Author: sin <sin@2f30.org>
Date: Thu, 28 Feb 2019 13:01:18 +0000
Rework types
Diffstat:
M dedup.c | 134 +++++++++++++++++++++----------
M dedup.h | 24 ++++++++++++++++--------
M types.c | 99 ++++++++++++++++++++++---------
3 files changed, 178 insertions(+), 79 deletions(-)
---
(DIR) diff --git a/dedup.c b/dedup.c
@@ -31,7 +31,8 @@ struct extract_args {
int ret;
};
-static struct snapshot_hdr snaphdr;
+static struct snapshot_hdr snap_hdr;
+static struct blk_hdr blk_hdr;
static struct cache *cache;
static int ifd;
static int sfd;
@@ -105,15 +106,11 @@ print_stats(struct stats *st)
static void
append_snap(struct snapshot *snap)
{
- /* Update snapshot header */
- snaphdr.nr_snapshots++;
- xlseek(ifd, 0, SEEK_SET);
- write_snaphdr(ifd, &snaphdr);
-
- /* Append snapshot */
- xlseek(ifd, 0, SEEK_END);
+ xlseek(ifd, snap_hdr.size, SEEK_SET);
write_snapshot(ifd, snap);
write_snapshot_blk_descs(ifd, snap);
+ snap_hdr.size += snap->size;
+ snap_hdr.nr_snapshots++;
}
static struct snapshot *
@@ -190,9 +187,9 @@ read_blk(uint8_t *buf, struct blk_desc *blk_desc)
static void
append_blk(uint8_t *buf, struct blk_desc *blk_desc)
{
- xlseek(sfd, snaphdr.store_size, SEEK_SET);
+ xlseek(sfd, blk_hdr.size, SEEK_SET);
xwrite(sfd, buf, blk_desc->size);
- snaphdr.store_size += blk_desc->size;
+ blk_hdr.size += blk_desc->size;
}
static void
@@ -208,15 +205,15 @@ dedup_chunk(struct snapshot *snap, uint8_t *chunkp, size_t chunk_size)
n = comp(chunkp, comp_buf, chunk_size, comp_size(BLKSIZE_MAX));
hash_blk(comp_buf, n, md);
- snaphdr.st.orig_size += chunk_size;
- snaphdr.st.comp_size += n;
+ blk_hdr.st.orig_size += chunk_size;
+ blk_hdr.st.comp_size += n;
memcpy(cache_entry.md, md, sizeof(cache_entry.md));
if (lookup_cache_entry(cache, &cache_entry) < 0) {
struct blk_desc blk_desc;
memcpy(&blk_desc.md, md, sizeof(blk_desc.md));
- blk_desc.offset = snaphdr.store_size;
+ blk_desc.offset = blk_hdr.size;
blk_desc.size = n;
snap->blk_desc[snap->nr_blk_descs++] = blk_desc;
@@ -228,13 +225,13 @@ dedup_chunk(struct snapshot *snap, uint8_t *chunkp, size_t chunk_size)
add_cache_entry(cache, &cache_entry);
cache_misses++;
- snaphdr.st.dedup_size += blk_desc.size;
- snaphdr.st.nr_blks++;
+ blk_hdr.st.dedup_size += blk_desc.size;
+ blk_hdr.st.nr_blks++;
- if (blk_desc.size > snaphdr.st.max_blk_size)
- snaphdr.st.max_blk_size = blk_desc.size;
- if (blk_desc.size < snaphdr.st.min_blk_size)
- snaphdr.st.min_blk_size = blk_desc.size;
+ if (blk_desc.size > blk_hdr.st.max_blk_size)
+ blk_hdr.st.max_blk_size = blk_desc.size;
+ if (blk_desc.size < blk_hdr.st.min_blk_size)
+ blk_hdr.st.min_blk_size = blk_desc.size;
} else {
struct blk_desc blk_desc;
@@ -406,7 +403,7 @@ walk_snap(int (*fn)(struct snapshot *, void *), void *arg)
{
uint64_t i;
- for (i = 0; i < snaphdr.nr_snapshots; i++) {
+ for (i = 0; i < snap_hdr.nr_snapshots; i++) {
struct snapshot *snap;
int ret;
@@ -422,6 +419,19 @@ walk_snap(int (*fn)(struct snapshot *, void *), void *arg)
}
}
+static void
+match_ver(uint64_t v)
+{
+ uint8_t maj, min;
+
+ min = v & 0xff;
+ maj = (v >> 8) & 0xff;
+ if (maj == VER_MAJ && min == VER_MIN)
+ return;
+ errx(1, "format version mismatch: expected %u.%u but got %u.%u",
+ VER_MAJ, VER_MIN, maj, min);
+}
+
static int
flush_cache(struct cache_entry *cache_entry)
{
@@ -441,7 +451,7 @@ load_cache(void)
nr_entries = sb.st_size / CACHE_ENTRY_LEN;
if (nr_entries == 0) {
- xlseek(ifd, SNAPHDR_LEN, SEEK_SET);
+ xlseek(ifd, SNAP_HDR_LEN, SEEK_SET);
walk_snap(rebuild_cache, NULL);
return;
}
@@ -455,26 +465,63 @@ load_cache(void)
}
static void
-load_snaphdr(void)
+save_cache(void)
+{
+ if (cache_dirty) {
+ xlseek(cfd, 0, SEEK_SET);
+ walk_cache(cache, flush_cache);
+ }
+}
+
+static void
+load_blk_hdr(void)
+{
+ struct stat sb;
+
+ if (fstat(sfd, &sb) < 0)
+ err(1, "fstat %s", STOREF);
+ if (sb.st_size == 0) {
+ blk_hdr.flags = (VER_MAJ << 8) | VER_MIN;
+ blk_hdr.size = BLK_HDR_LEN;
+ blk_hdr.st.min_blk_size = comp_size(BLKSIZE_MAX);
+ write_blk_hdr(sfd, &blk_hdr);
+ return;
+ }
+
+ read_blk_hdr(sfd, &blk_hdr);
+ match_ver(blk_hdr.flags);
+}
+
+static void
+save_blk_hdr(void)
+{
+ xlseek(sfd, 0, SEEK_SET);
+ write_blk_hdr(sfd, &blk_hdr);
+}
+
+static void
+load_snap_hdr(void)
{
- uint8_t maj, min;
struct stat sb;
if (fstat(ifd, &sb) < 0)
err(1, "fstat %s", SNAPSF);
if (sb.st_size == 0) {
- snaphdr.flags = (VER_MAJ << 8) | VER_MIN;
- snaphdr.st.min_blk_size = comp_size(BLKSIZE_MAX);
- write_snaphdr(ifd, &snaphdr);
+ snap_hdr.flags = (VER_MAJ << 8) | VER_MIN;
+ snap_hdr.size = SNAP_HDR_LEN;
+ write_snap_hdr(ifd, &snap_hdr);
return;
}
- read_snaphdr(ifd, &snaphdr);
- min = snaphdr.flags & 0xff;
- maj = (snaphdr.flags >> 8) & 0xff;
- if (maj != VER_MAJ || min != VER_MIN)
- errx(1, "format version mismatch: expected %u.%u but got %u.%u",
- VER_MAJ, VER_MIN, maj, min);
+ read_snap_hdr(ifd, &snap_hdr);
+ match_ver(snap_hdr.flags);
+}
+
+static void
+save_snap_hdr(void)
+{
+ xlseek(ifd, 0, SEEK_SET);
+ write_snap_hdr(ifd, &snap_hdr);
}
static void
@@ -499,21 +546,20 @@ init(void)
flock(cfd, LOCK_NB | LOCK_EX) < 0)
errx(1, "busy lock");
- load_snaphdr();
+ load_snap_hdr();
+ load_blk_hdr();
load_cache();
}
static void
term(void)
{
- if (verbose)
- print_stats(&snaphdr.st);
+ if (verbose > 0)
+ print_stats(&blk_hdr.st);
- if (cache_dirty) {
- xlseek(cfd, 0, SEEK_SET);
- walk_cache(cache, flush_cache);
- }
- free_cache(cache);
+ save_snap_hdr();
+ save_blk_hdr();
+ save_cache();
fsync(ifd);
fsync(sfd);
@@ -522,6 +568,8 @@ term(void)
close(ifd);
close(sfd);
close(cfd);
+
+ free_cache(cache);
}
static void
@@ -589,14 +637,14 @@ main(int argc, char *argv[])
init();
if (cflag) {
- xlseek(ifd, SNAPHDR_LEN, SEEK_SET);
+ xlseek(ifd, SNAP_HDR_LEN, SEEK_SET);
walk_snap(check, NULL);
term();
return 0;
}
if (lflag) {
- xlseek(ifd, SNAPHDR_LEN, SEEK_SET);
+ xlseek(ifd, SNAP_HDR_LEN, SEEK_SET);
walk_snap(list, NULL);
term();
return 0;
@@ -605,7 +653,7 @@ main(int argc, char *argv[])
if (id) {
struct extract_args args;
- xlseek(ifd, SNAPHDR_LEN, SEEK_SET);
+ xlseek(ifd, SNAP_HDR_LEN, SEEK_SET);
str2bin(id, md);
args.md = md;
args.fd = fd;
(DIR) diff --git a/dedup.h b/dedup.h
@@ -6,16 +6,17 @@
* using the helpers from types.c. Any modification made to
* the structs below will need to be reflected here and in types.c.
*/
-#define SNAPHDR_LEN 152
-#define BLKDESC_LEN 48
+#define SNAP_HDR_LEN 56
+#define BLK_HDR_LEN 112
+#define BLK_DESC_LEN 48
#define SNAPSHOT_LEN 304
#define CACHE_ENTRY_LEN 48
#define MSGSIZE 256
#define MDSIZE 32
-/* snashot file format version */
-#define VER_MIN 1
+/* file format version */
+#define VER_MIN 2
#define VER_MAJ 0
struct cache;
@@ -33,9 +34,14 @@ struct stats {
struct snapshot_hdr {
uint64_t flags;
+ uint64_t size;
uint64_t nr_snapshots;
- uint64_t store_size;
uint64_t reserved[4];
+};
+
+struct blk_hdr {
+ uint64_t flags;
+ uint64_t size;
struct stats st;
};
@@ -83,9 +89,11 @@ int pack(unsigned char *dst, char *fmt, ...);
int unpack(unsigned char *src, char *fmt, ...);
/* types.c */
-void read_snaphdr(int fd, struct snapshot_hdr *hdr);
-void write_snaphdr(int fd, struct snapshot_hdr *hdr);
-void write_snaphdr(int fd, struct snapshot_hdr *hdr);
+void read_snap_hdr(int fd, struct snapshot_hdr *hdr);
+void write_snap_hdr(int fd, struct snapshot_hdr *hdr);
+void read_blk_hdr(int fd, struct blk_hdr *hdr);
+void write_blk_hdr(int fd, struct blk_hdr *hdr);
+void read_blk_desc(int fd, struct blk_desc *desc);
void write_blk_desc(int fd, struct blk_desc *desc);
void read_snapshot(int fd, struct snapshot *snap);
void read_snapshot_descs(int fd, struct snapshot *snap);
(DIR) diff --git a/types.c b/types.c
@@ -7,18 +7,18 @@
#include "dedup.h"
void
-read_snaphdr(int fd, struct snapshot_hdr *hdr)
+read_snap_hdr(int fd, struct snapshot_hdr *hdr)
{
- uint8_t buf[SNAPHDR_LEN];
+ uint8_t buf[SNAP_HDR_LEN];
int n;
if (xread(fd, buf, sizeof(buf)) == 0)
- errx(1, "read_snaphdr: unexpected EOF");
+ errx(1, "read_snap_hdr: unexpected EOF");
n = unpack(buf, "qqq",
&hdr->flags,
- &hdr->nr_snapshots,
- &hdr->store_size);
+ &hdr->size,
+ &hdr->nr_snapshots);
n += unpack(&buf[n], "qqqq",
&hdr->reserved[0],
@@ -26,6 +26,57 @@ read_snaphdr(int fd, struct snapshot_hdr *hdr)
&hdr->reserved[2],
&hdr->reserved[3]);
+ if (verbose > 1)
+ printf("%s: flags = %llx, size = %llx, nr_snapshots = %llx\n",
+ __func__,
+ (unsigned long long)hdr->flags,
+ (unsigned long long)hdr->size,
+ (unsigned long long)hdr->nr_snapshots);
+
+ assert(n == SNAP_HDR_LEN);
+}
+
+void
+write_snap_hdr(int fd, struct snapshot_hdr *hdr)
+{
+ uint8_t buf[SNAP_HDR_LEN];
+ int n;
+
+ n = pack(buf, "qqq",
+ hdr->flags,
+ hdr->size,
+ hdr->nr_snapshots);
+
+ n += pack(&buf[n], "qqqq",
+ hdr->reserved[0],
+ hdr->reserved[1],
+ hdr->reserved[2],
+ hdr->reserved[3]);
+
+ if (verbose > 1)
+ printf("%s: flags = %llx, size = %llx, nr_snapshots = %llx\n",
+ __func__,
+ (unsigned long long)hdr->flags,
+ (unsigned long long)hdr->size,
+ (unsigned long long)hdr->nr_snapshots);
+
+ assert(n == SNAP_HDR_LEN);
+ xwrite(fd, buf, n);
+}
+
+void
+read_blk_hdr(int fd, struct blk_hdr *hdr)
+{
+ uint8_t buf[BLK_HDR_LEN];
+ int n;
+
+ if (xread(fd, buf, sizeof(buf)) == 0)
+ errx(1, "read_blk_desc: unexpected EOF");
+
+ n = unpack(buf, "qq",
+ &hdr->flags,
+ &hdr->size);
+
n += unpack(&buf[n], "qqqqqq",
&hdr->st.orig_size,
&hdr->st.comp_size,
@@ -42,25 +93,18 @@ read_snaphdr(int fd, struct snapshot_hdr *hdr)
&hdr->st.reserved[4],
&hdr->st.reserved[5]);
- assert(n == SNAPHDR_LEN);
+ assert(n == BLK_HDR_LEN);
}
void
-write_snaphdr(int fd, struct snapshot_hdr *hdr)
+write_blk_hdr(int fd, struct blk_hdr *hdr)
{
- uint8_t buf[SNAPHDR_LEN];
+ uint8_t buf[BLK_HDR_LEN];
int n;
- n = pack(buf, "qqq",
+ n = pack(buf, "qq",
hdr->flags,
- hdr->nr_snapshots,
- hdr->store_size);
-
- n += pack(&buf[n], "qqqq",
- hdr->reserved[0],
- hdr->reserved[1],
- hdr->reserved[2],
- hdr->reserved[3]);
+ hdr->size);
n += pack(&buf[n], "qqqqqq",
hdr->st.orig_size,
@@ -78,14 +122,14 @@ write_snaphdr(int fd, struct snapshot_hdr *hdr)
hdr->st.reserved[4],
hdr->st.reserved[5]);
- assert(n == SNAPHDR_LEN);
+ assert(n == BLK_HDR_LEN);
xwrite(fd, buf, n);
}
void
read_blk_desc(int fd, struct blk_desc *desc)
{
- uint8_t buf[BLKDESC_LEN];
+ uint8_t buf[BLK_DESC_LEN];
char fmt[BUFSIZ];
int n;
@@ -98,13 +142,13 @@ read_blk_desc(int fd, struct blk_desc *desc)
&desc->offset,
&desc->size);
- assert(n == BLKDESC_LEN);
+ assert(n == BLK_DESC_LEN);
}
void
write_blk_desc(int fd, struct blk_desc *desc)
{
- uint8_t buf[BLKDESC_LEN];
+ uint8_t buf[BLK_DESC_LEN];
char fmt[BUFSIZ];
int n;
@@ -114,7 +158,7 @@ write_blk_desc(int fd, struct blk_desc *desc)
desc->offset,
desc->size);
- assert(n == BLKDESC_LEN);
+ assert(n == BLK_DESC_LEN);
xwrite(fd, buf, n);
}
@@ -154,16 +198,15 @@ write_snapshot(int fd, struct snapshot *snap)
char fmt[BUFSIZ];
int n;
- snprintf(fmt, sizeof(fmt), "q'%d'%dq", MSGSIZE, MDSIZE);
-
- if (mul_overflow(snap->nr_blk_descs, BLKDESC_LEN))
+ if (mul_overflow(snap->nr_blk_descs, BLK_DESC_LEN))
errx(1, "write_snapshot: overflow");
- snap->size = snap->nr_blk_descs * BLKDESC_LEN;
+ snap->size = snap->nr_blk_descs * BLK_DESC_LEN;
- if (add_overflow(SNAPHDR_LEN, snap->size))
+ if (add_overflow(SNAPSHOT_LEN, snap->size))
errx(1, "write_snapshot: overflow");
- snap->size += SNAPHDR_LEN;
+ snap->size += SNAPSHOT_LEN;
+ snprintf(fmt, sizeof(fmt), "q'%d'%dq", MSGSIZE, MDSIZE);
n = pack(buf, fmt,
snap->size,
snap->msg,