extern int do_xfers;
extern int link_dest;
extern int make_backups;
+extern int protocol_version;
extern int remove_source_files;
extern int stdout_format_has_i;
extern int maybe_ATTRS_REPORT;
alloc_pool_t hlink_pool;
+#define HASH_LOAD_LIMIT(size) ((size)*3/4)
#define FPTR(i) (the_file_list->files[i])
-#define LINKED(i1,i2) ((i1)->dev == (i2)->dev && (i1)->ino == (i2)->ino)
+
+struct ihash_table {
+ int32 size;
+ int32 entries;
+ struct idev_node *buckets;
+} *dev_tbl;
+
+static struct idev_node *ihash_node(struct ihash_table *tbl, int64 key);
+
+/* Starting with protocol 30, we use a simple hashtable on the sending side
+ * for hashing the st_dev and st_ino info. The receiving side gets told
+ * (via flags and a "group index") which items are hard-linked together, so
+ * we can avoid the pool of dev+inode data. */
+
+static struct ihash_table *ihash_create(int size)
+{
+ struct ihash_table *tbl;
+
+ /* Pick a power of 2 that can hold the requested size. */
+ if (size & (size-1)) {
+ int req = size;
+ size = 32;
+ while (size < req)
+ size *= 2;
+ }
+
+ if (!(tbl = new(struct ihash_table))
+ || !(tbl->buckets = new_array(struct idev_node, size)))
+ out_of_memory("ihash_create");
+ memset(tbl->buckets, 0, size * sizeof tbl->buckets[0]);
+ tbl->size = size;
+ tbl->entries = 0;
+
+ return tbl;
+}
+
+static void ihash_destroy(struct ihash_table *tbl)
+{
+ free(tbl->buckets);
+ free(tbl);
+}
void init_hard_links(void)
{
+ if (protocol_version >= 30) {
+ dev_tbl = ihash_create(16);
+ return;
+ }
+
if (!(hlink_pool = pool_create(HLINK_EXTENT, sizeof (struct idev),
out_of_memory, POOL_INTERN)))
out_of_memory("init_hard_links");
}
-static int hlink_compare(int *int1, int *int2)
+static void expand_ihash(struct ihash_table *tbl)
+{
+ struct idev_node *old_buckets;
+ int size = tbl->size * 2;
+ int i;
+
+ old_buckets = tbl->buckets;
+ if (!(tbl->buckets = new_array(struct idev_node, size)))
+ out_of_memory("ihash_create");
+ memset(tbl->buckets, 0, size * sizeof tbl->buckets[0]);
+ tbl->size = size;
+ tbl->entries = 0;
+
+ for (i = size / 2; i-- > 0; ) {
+ int64 key = old_buckets[i].key;
+ if (key == 0)
+ continue;
+ ihash_node(tbl, key)->data = old_buckets[i].data;
+ }
+
+ free(old_buckets);
+}
+
+/* This returns the node for the indicated key, either newly created,
+ * or already existing. */
+static struct idev_node *ihash_node(struct ihash_table *tbl, int64 key)
+{
+ uint32 bkt;
+
+ if (tbl->entries > HASH_LOAD_LIMIT(tbl->size))
+ expand_ihash(tbl);
+
+#if SIZEOF_INT64 < 8
+ /* Based on Jenkins One-at-a-time hash. */
+ {
+ uchar *keyp = (uchar*)&key;
+ int i;
+
+ for (bkt = 0, i = 0; i < SIZEOF_INT64; i++) {
+ bkt += keyp[i];
+ bkt += (bkt << 10);
+ bkt ^= (bkt >> 6);
+ }
+ bkt += (bkt << 3);
+ bkt ^= (bkt >> 11);
+ bkt += (bkt << 15);
+ }
+#else
+#define rot(x,k) (((x)<<(k)) ^ ((x)>>(32-(k))))
+ /* Based on Jenkins hashword() from lookup3.c. */
+ {
+ uint32 a, b, c;
+
+ /* Set up the internal state */
+ a = b = c = 0xdeadbeef + (8 << 2);
+
+ b += (uint32)(key >> 32);
+ a += (uint32)key;
+ c ^= b; c -= rot(b, 14);
+ a ^= c; a -= rot(c, 11);
+ b ^= a; b -= rot(a, 25);
+ c ^= b; c -= rot(b, 16);
+ a ^= c; a -= rot(c, 4);
+ b ^= a; b -= rot(a, 14);
+ c ^= b; c -= rot(b, 24);
+ bkt = c;
+ }
+#endif
+
+ /* If it already exists, return it. */
+ while (1) {
+ bkt &= tbl->size - 1;
+ if (tbl->buckets[bkt].key == key)
+ return &tbl->buckets[bkt];
+ if (tbl->buckets[bkt].key == 0)
+ break;
+ bkt++;
+ }
+
+ /* Otherwise, take over this empty spot and then return it. */
+ tbl->buckets[bkt].key = key;
+ tbl->entries++;
+ return &tbl->buckets[bkt];
+}
+
+struct idev_node *idev_node(int64 dev, int64 ino)
+{
+ static struct idev_node *dev_node = NULL;
+ struct ihash_table *tbl;
+
+ if (!dev_node || dev_node->key != dev) {
+ /* We keep a separate hash table of inodes for every device. */
+ dev_node = ihash_node(dev_tbl, dev);
+ if (!(tbl = dev_node->data))
+ tbl = dev_node->data = ihash_create(512);
+ } else
+ tbl = dev_node->data;
+
+ return ihash_node(tbl, ino);
+}
+
+void idev_destroy(void)
+{
+ int i;
+
+ for (i = 0; i < dev_tbl->size; i++) {
+ if (dev_tbl->buckets[i].data)
+ ihash_destroy(dev_tbl->buckets[i].data);
+ }
+
+ ihash_destroy(dev_tbl);
+}
+
+/* This routine compares dev+inode info for protocols < 30. */
+static int hlink_compare_idev(int *int1, int *int2)
{
struct file_struct *f1 = FPTR(*int1);
struct file_struct *f2 = FPTR(*int2);
if (i1->ino != i2->ino)
return i1->ino > i2->ino ? 1 : -1;
- return f_name_cmp(f1, f2);
+ return *int1 > *int2 ? 1 : -1;
}
-/* Analyze the dev+inode data in the file-list by creating a list of all
- * the items that have hlink data, sorting them, and matching up identical
- * values into clusters. These will be a single linked list from last to
- * first when we're done. */
-void match_hard_links(void)
+/* This routine compares group numbers for protocols >= 30. */
+static int hlink_compare_gnum(int *int1, int *int2)
{
- int32 from, prev, *ndx_list;
- struct file_struct *file, *file_next;
- struct idev *idev, *idev_next;
- int i, ndx_count = 0;
+ struct file_struct *f1 = FPTR(*int1);
+ struct file_struct *f2 = FPTR(*int2);
+ int gnum1 = F_HL_GNUM(f1);
+ int gnum2 = F_HL_GNUM(f2);
- if (!(ndx_list = new_array(int32, the_file_list->count)))
- out_of_memory("match_hard_links");
+ if (gnum1 != gnum2)
+ return gnum1 > gnum2 ? 1 : -1;
- for (i = 0; i < the_file_list->count; i++) {
- if (F_IS_HLINKED(FPTR(i)))
- ndx_list[ndx_count++] = i;
- }
+ return *int1 > *int2 ? 1 : -1;
+}
- if (!ndx_count) {
- free(ndx_list);
- return;
- }
+/* The match routine for protocols < 30. */
+static void match_idevs(int32 *ndx_list, int ndx_count)
+{
+ int32 from, prev;
+ struct file_struct *file, *file_next;
+ struct idev *idev, *idev_next;
qsort(ndx_list, ndx_count, sizeof ndx_list[0],
- (int (*)()) hlink_compare);
+ (int (*)()) hlink_compare_idev);
for (from = 0; from < ndx_count; from++) {
for (file = FPTR(ndx_list[from]), idev = F_HL_IDEV(file), prev = -1;
{
file_next = FPTR(ndx_list[from+1]);
idev_next = F_HL_IDEV(file_next);
- if (!LINKED(idev, idev_next))
+ if (idev->dev != idev_next->dev || idev->ino != idev_next->ino)
break;
pool_free(hlink_pool, 0, idev);
if (prev < 0)
F_HL_PREV(file) = prev;
}
}
+}
- pool_destroy(hlink_pool);
+/* The match routine for protocols >= 30. */
+static void match_gnums(int32 *ndx_list, int ndx_count)
+{
+ int32 from, prev;
+ struct file_struct *file, *file_next;
+ int gnum, gnum_next;
+
+ qsort(ndx_list, ndx_count, sizeof ndx_list[0],
+ (int (*)()) hlink_compare_gnum);
+
+ for (from = 0; from < ndx_count; from++) {
+ for (file = FPTR(ndx_list[from]), gnum = F_HL_GNUM(file), prev = -1;
+ from < ndx_count-1;
+ file = file_next, gnum = gnum_next, prev = ndx_list[from++])
+ {
+ file_next = FPTR(ndx_list[from+1]);
+ gnum_next = F_HL_GNUM(file_next);
+ if (gnum != gnum_next)
+ break;
+ if (prev < 0)
+ file->flags |= FLAG_HLINK_FIRST;
+ F_HL_PREV(file) = prev;
+ }
+ if (prev < 0)
+ file->flags &= ~FLAG_HLINKED;
+ else {
+ file->flags |= FLAG_HLINK_LAST;
+ F_HL_PREV(file) = prev;
+ }
+ }
+}
+
+/* Analyze the hard-links in the file-list by creating a list of all the
+ * items that have hlink data, sorting them, and matching up identical
+ * values into clusters. These will be a single linked list from last
+ * to first when we're done. */
+void match_hard_links(void)
+{
+ int i, ndx_count = 0;
+ int32 *ndx_list;
+
+ if (!(ndx_list = new_array(int32, the_file_list->count)))
+ out_of_memory("match_hard_links");
+
+ for (i = 0; i < the_file_list->count; i++) {
+ if (F_IS_HLINKED(FPTR(i)))
+ ndx_list[ndx_count++] = i;
+ }
+
+ if (ndx_count) {
+ if (protocol_version >= 30)
+ match_gnums(ndx_list, ndx_count);
+ else {
+ match_idevs(ndx_list, ndx_count);
+ pool_destroy(hlink_pool);
+ }
+ }
free(ndx_list);
}
Matt McCutchen's Web Site / rsync / rsync.git / commitdiff