/*
- Copyright (C) Andrew Tridgell 1996
- Copyright (C) Paul Mackerras 1996
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-*/
+ * Block matching used by the file-transfer code.
+ *
+ * Copyright (C) 1996 Andrew Tridgell
+ * Copyright (C) 1996 Paul Mackerras
+ * Copyright (C) 2003-2008 Wayne Davison
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, visit the http://fsf.org website.
+ */
#include "rsync.h"
-extern int verbose;
-extern int am_server;
-extern int do_progress;
extern int checksum_seed;
extern int append_mode;
int updating_basis_file;
-typedef unsigned short tag;
-
-#define TABLESIZE (1<<16)
-#define NULL_TAG (-1)
-
static int false_alarms;
-static int tag_hits;
+static int hash_hits;
static int matches;
static int64 data_transfer;
static int total_false_alarms;
-static int total_tag_hits;
+static int total_hash_hits;
static int total_matches;
extern struct stats stats;
-struct target {
- tag t;
- int32 i;
-};
+#define TRADITIONAL_TABLESIZE (1<<16)
-static struct target *targets;
+static uint32 tablesize;
+static int32 *hash_table;
-static int32 *tag_table;
-
-#define gettag2(s1,s2) (((s1) + (s2)) & 0xFFFF)
-#define gettag(sum) gettag2((sum)&0xFFFF,(sum)>>16)
-
-static int compare_targets(struct target *t1,struct target *t2)
-{
- return (int)t1->t - (int)t2->t;
-}
+#define SUM2HASH2(s1,s2) (((s1) + (s2)) & 0xFFFF)
+#define SUM2HASH(sum) SUM2HASH2((sum)&0xFFFF,(sum)>>16)
+#define BIG_SUM2HASH(sum) ((sum)%tablesize)
static void build_hash_table(struct sum_struct *s)
{
+ static uint32 alloc_size;
int32 i;
- if (!tag_table)
- tag_table = new_array(int32, TABLESIZE);
-
- targets = new_array(struct target, s->count);
- if (!tag_table || !targets)
- out_of_memory("build_hash_table");
-
- for (i = 0; i < s->count; i++) {
- targets[i].i = i;
- targets[i].t = gettag(s->sums[i].sum1);
+ /* Dynamically calculate the hash table size so that the hash load
+ * for big files is about 80%. A number greater than the traditional
+ * size must be odd or s2 will not be able to span the entire set. */
+ tablesize = (uint32)(s->count/8) * 10 + 11;
+ if (tablesize < TRADITIONAL_TABLESIZE)
+ tablesize = TRADITIONAL_TABLESIZE;
+ if (tablesize > alloc_size || tablesize < alloc_size - 16*1024) {
+ if (hash_table)
+ free(hash_table);
+ hash_table = new_array(int32, tablesize);
+ if (!hash_table)
+ out_of_memory("build_hash_table");
+ alloc_size = tablesize;
}
- qsort(targets,s->count,sizeof(targets[0]),(int (*)())compare_targets);
-
- for (i = 0; i < TABLESIZE; i++)
- tag_table[i] = NULL_TAG;
+ memset(hash_table, 0xFF, tablesize * sizeof hash_table[0]);
- for (i = s->count; i-- > 0; )
- tag_table[targets[i].t] = i;
+ if (tablesize == TRADITIONAL_TABLESIZE) {
+ for (i = 0; i < s->count; i++) {
+ uint32 t = SUM2HASH(s->sums[i].sum1);
+ s->sums[i].chain = hash_table[t];
+ hash_table[t] = i;
+ }
+ } else {
+ for (i = 0; i < s->count; i++) {
+ uint32 t = BIG_SUM2HASH(s->sums[i].sum1);
+ s->sums[i].chain = hash_table[t];
+ hash_table[t] = i;
+ }
+ }
}
static void matched(int f, struct sum_struct *s, struct map_struct *buf,
OFF_T offset, int32 i)
{
- int32 n = offset - last_match; /* max value: block_size (int32) */
+ int32 n = (int32)(offset - last_match); /* max value: block_size (int32) */
int32 j;
- if (verbose > 2 && i >= 0) {
+ if (DEBUG_GTE(CHKSUM, 2) && i >= 0) {
rprintf(FINFO,
- "match at %.0f last_match=%.0f j=%d len=%ld n=%ld\n",
- (double)offset, (double)last_match, i,
+ "match at %s last_match=%s j=%d len=%ld n=%ld\n",
+ big_num(offset, 0), big_num(last_match, 0), i,
(long)s->sums[i].len, (long)n);
}
sum_update(map_ptr(buf, last_match + j, n1), n1);
}
-
if (i >= 0)
last_match = offset + s->sums[i].len;
else
last_match = offset;
- if (buf && do_progress)
+ if (buf && INFO_GTE(PROGRESS, 1))
show_progress(last_match, buf->file_size);
}
static void hash_search(int f,struct sum_struct *s,
struct map_struct *buf, OFF_T len)
{
- OFF_T offset, end, backup;
- int32 k, want_i;
+ OFF_T offset, end;
+ int32 k, want_i, backup;
char sum2[SUM_LENGTH];
uint32 s1, s2, sum;
int more;
* coding of the output to work more efficiently. */
want_i = 0;
- if (verbose > 2) {
- rprintf(FINFO, "hash search b=%ld len=%.0f\n",
- (long)s->blength, (double)len);
+ if (DEBUG_GTE(CHKSUM, 2)) {
+ rprintf(FINFO, "hash search b=%ld len=%s\n",
+ (long)s->blength, big_num(len, 0));
}
k = (int32)MIN(len, (OFF_T)s->blength);
sum = get_checksum1((char *)map, k);
s1 = sum & 0xFFFF;
s2 = sum >> 16;
- if (verbose > 3)
+ if (DEBUG_GTE(CHKSUM, 3))
rprintf(FINFO, "sum=%.8x k=%ld\n", sum, (long)k);
offset = 0;
end = len + 1 - s->sums[s->count-1].len;
- if (verbose > 3) {
- rprintf(FINFO, "hash search s->blength=%ld len=%.0f count=%.0f\n",
- (long)s->blength, (double)len, (double)s->count);
+ if (DEBUG_GTE(CHKSUM, 3)) {
+ rprintf(FINFO, "hash search s->blength=%ld len=%s count=%s\n",
+ (long)s->blength, big_num(len, 0), big_num(s->count, 0));
}
do {
- tag t = gettag2(s1,s2);
int done_csum2 = 0;
- int32 j = tag_table[t];
+ int32 i;
- if (verbose > 4)
- rprintf(FINFO,"offset=%.0f sum=%08x\n",(double)offset,sum);
+ if (DEBUG_GTE(CHKSUM, 4)) {
+ rprintf(FINFO, "offset=%s sum=%04x%04x\n",
+ big_num(offset, 0), s2 & 0xFFFF, s1 & 0xFFFF);
+ }
- if (j == NULL_TAG)
- goto null_tag;
+ if (tablesize == TRADITIONAL_TABLESIZE) {
+ if ((i = hash_table[SUM2HASH2(s1,s2)]) < 0)
+ goto null_hash;
+ sum = (s1 & 0xffff) | (s2 << 16);
+ } else {
+ sum = (s1 & 0xffff) | (s2 << 16);
+ if ((i = hash_table[BIG_SUM2HASH(sum)]) < 0)
+ goto null_hash;
+ }
- sum = (s1 & 0xffff) | (s2 << 16);
- tag_hits++;
+ hash_hits++;
do {
- int32 l, i = targets[j].i;
+ int32 l;
if (sum != s->sums[i].sum1)
continue;
&& !(s->sums[i].flags & SUMFLG_SAME_OFFSET))
continue;
- if (verbose > 3)
- rprintf(FINFO,"potential match at %.0f target=%.0f %.0f sum=%08x\n",
- (double)offset,(double)j,(double)i,sum);
+ if (DEBUG_GTE(CHKSUM, 3)) {
+ rprintf(FINFO,
+ "potential match at %s i=%ld sum=%08x\n",
+ big_num(offset, 0), (long)i, sum);
+ }
if (!done_csum2) {
map = (schar *)map_ptr(buf,offset,l);
* one with an identical offset, so we prefer that over
* the following want_i optimization. */
if (updating_basis_file) {
- do {
- int32 i2 = targets[j].i;
+ int32 i2;
+ for (i2 = i; i2 >= 0; i2 = s->sums[i2].chain) {
if (s->sums[i2].offset != offset)
continue;
if (i2 != i) {
* both the sender and the receiver. */
s->sums[i].flags |= SUMFLG_SAME_OFFSET;
goto set_want_i;
- } while (++j < s->count && targets[j].t == t);
+ }
}
/* we've found a match, but now check to see
s2 = sum >> 16;
matches++;
break;
- } while (++j < s->count && targets[j].t == t);
+ } while ((i = s->sums[i].chain) >= 0);
- null_tag:
- backup = offset - last_match;
+ null_hash:
+ backup = (int32)(offset - last_match);
/* We sometimes read 1 byte prior to last_match... */
if (backup < 0)
backup = 0;
**/
void match_sums(int f, struct sum_struct *s, struct map_struct *buf, OFF_T len)
{
- char file_sum[MD4_SUM_LENGTH];
+ char file_sum[MAX_DIGEST_LEN];
+ int sum_len;
last_match = 0;
false_alarms = 0;
- tag_hits = 0;
+ hash_hits = 0;
matches = 0;
data_transfer = 0;
sum_init(checksum_seed);
- if (append_mode) {
- OFF_T j = 0;
- for (j = CHUNK_SIZE; j < s->flength; j += CHUNK_SIZE) {
- if (buf && do_progress)
- show_progress(last_match, buf->file_size);
- sum_update(map_ptr(buf, last_match, CHUNK_SIZE),
- CHUNK_SIZE);
- last_match = j;
- }
- if (last_match < s->flength) {
- int32 len = s->flength - last_match;
- if (buf && do_progress)
- show_progress(last_match, buf->file_size);
- sum_update(map_ptr(buf, last_match, len), len);
- last_match = s->flength;
+ if (append_mode > 0) {
+ if (append_mode == 2) {
+ OFF_T j = 0;
+ for (j = CHUNK_SIZE; j < s->flength; j += CHUNK_SIZE) {
+ if (buf && INFO_GTE(PROGRESS, 1))
+ show_progress(last_match, buf->file_size);
+ sum_update(map_ptr(buf, last_match, CHUNK_SIZE),
+ CHUNK_SIZE);
+ last_match = j;
+ }
+ if (last_match < s->flength) {
+ int32 n = (int32)(s->flength - last_match);
+ if (buf && INFO_GTE(PROGRESS, 1))
+ show_progress(last_match, buf->file_size);
+ sum_update(map_ptr(buf, last_match, n), n);
+ }
}
+ last_match = s->flength;
s->count = 0;
}
if (len > 0 && s->count > 0) {
build_hash_table(s);
- if (verbose > 2)
+ if (DEBUG_GTE(CHKSUM, 2))
rprintf(FINFO,"built hash table\n");
- hash_search(f,s,buf,len);
+ hash_search(f, s, buf, len);
- if (verbose > 2)
+ if (DEBUG_GTE(CHKSUM, 2))
rprintf(FINFO,"done hash search\n");
} else {
OFF_T j;
matched(f, s, buf, len, -1);
}
- sum_end(file_sum);
+ sum_len = sum_end(file_sum);
/* If we had a read error, send a bad checksum. */
if (buf && buf->status != 0)
file_sum[0]++;
- if (verbose > 2)
+ if (DEBUG_GTE(CHKSUM, 2))
rprintf(FINFO,"sending file_sum\n");
- write_buf(f,file_sum,MD4_SUM_LENGTH);
-
- if (targets) {
- free(targets);
- targets=NULL;
- }
+ write_buf(f, file_sum, sum_len);
- if (verbose > 2)
- rprintf(FINFO, "false_alarms=%d tag_hits=%d matches=%d\n",
- false_alarms, tag_hits, matches);
+ if (DEBUG_GTE(CHKSUM, 2))
+ rprintf(FINFO, "false_alarms=%d hash_hits=%d matches=%d\n",
+ false_alarms, hash_hits, matches);
- total_tag_hits += tag_hits;
+ total_hash_hits += hash_hits;
total_false_alarms += false_alarms;
total_matches += matches;
stats.literal_data += data_transfer;
void match_report(void)
{
- if (verbose <= 1)
+ if (!DEBUG_GTE(CHKSUM, 1))
return;
rprintf(FINFO,
- "total: matches=%d tag_hits=%d false_alarms=%d data=%.0f\n",
- total_matches,total_tag_hits,
- total_false_alarms,
- (double)stats.literal_data);
+ "total: matches=%d hash_hits=%d false_alarms=%d data=%s\n",
+ total_matches, total_hash_hits, total_false_alarms,
+ big_num(stats.literal_data, 0));
}
Matt McCutchen's Web Site / rsync / rsync.git / blobdiff