/*
- Copyright (C) Andrew Tridgell 1996
- Copyright (C) Paul Mackerras 1996
- Copyright (C) 2002 by Martin Pool <mbp@samba.org>
-
- 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.
-*/
+ * Routines to support hard-linking.
+ *
+ * Copyright (C) 1996 Andrew Tridgell
+ * Copyright (C) 1996 Paul Mackerras
+ * Copyright (C) 2002 Martin Pool <mbp@samba.org>
+ * Copyright (C) 2004-2007 Wayne Davison
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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.,
+ * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
+ */
#include "rsync.h"
-extern int dry_run;
extern int verbose;
+extern int dry_run;
+extern int do_xfers;
+extern int link_dest;
+extern int preserve_acls;
extern int make_backups;
+extern int protocol_version;
+extern int remove_source_files;
+extern int stdout_format_has_i;
+extern int maybe_ATTRS_REPORT;
+extern char *basis_dir[];
+extern struct file_list *cur_flist;
+#ifdef ICONV_OPTION
+extern int ic_ndx;
+#endif
+
+#ifdef SUPPORT_HARD_LINKS
-#if SUPPORT_HARD_LINKS
-static int hlink_compare(struct file_struct **file1, struct file_struct **file2)
+#define HASH_LOAD_LIMIT(size) ((size)*3/4)
+
+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 file_struct *f1 = *file1;
- struct file_struct *f2 = *file2;
+ struct ihash_table *tbl;
+
+ /* Pick a power of 2 that can hold the requested size. */
+ if (size & (size-1) || size < 16) {
+ int req = size;
+ size = 16;
+ 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;
- if (f1->F_DEV != f2->F_DEV)
- return (int) (f1->F_DEV > f2->F_DEV ? 1 : -1);
+ return tbl;
+}
- if (f1->F_INODE != f2->F_INODE)
- return (int) (f1->F_INODE > f2->F_INODE ? 1 : -1);
+static void ihash_destroy(struct ihash_table *tbl)
+{
+ free(tbl->buckets);
+ free(tbl);
+}
- return file_compare(file1, file2);
+void init_hard_links(void)
+{
+ dev_tbl = ihash_create(16);
}
-static struct file_struct **hlink_list;
-static int hlink_count;
+static void expand_ihash(struct ihash_table *tbl)
+{
+ struct idev_node *old_buckets = tbl->buckets;
+ int size = tbl->size * 2;
+ int i;
-#define LINKED(p1,p2) ((p1)->F_DEV == (p2)->F_DEV \
- && (p1)->F_INODE == (p2)->F_INODE)
+ if (!(tbl->buckets = new_array(struct idev_node, size)))
+ out_of_memory("ihash_create");
+ memset(tbl->buckets, 0, size * sizeof (struct idev_node));
+ tbl->size = size;
+ tbl->entries = 0;
-/* Analyze the data in the hlink_list[], remove items that aren't multiply
- * linked, and replace the dev+inode data with the hlindex+next linked list. */
-static void link_idev_data(struct file_list *flist)
+ 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)
{
- struct file_struct *head;
- int from, to, start;
-
- alloc_pool_t hlink_pool;
- alloc_pool_t idev_pool = flist->hlink_pool;
-
- hlink_pool = pool_create(128 * 1024, sizeof (struct hlink),
- out_of_memory, POOL_INTERN);
-
- for (from = to = 0; from < hlink_count; from++) {
- start = from;
- head = hlink_list[start];
- while (from < hlink_count-1
- && LINKED(hlink_list[from], hlink_list[from+1])) {
- pool_free(idev_pool, 0, hlink_list[from]->link_u.idev);
- hlink_list[from]->link_u.links = pool_talloc(hlink_pool,
- struct hlink, 1, "hlink_list");
-
- hlink_list[from]->F_HLINDEX = to;
- hlink_list[from]->F_NEXT = hlink_list[from+1];
- from++;
- }
- if (from > start) {
- pool_free(idev_pool, 0, hlink_list[from]->link_u.idev);
- hlink_list[from]->link_u.links = pool_talloc(hlink_pool,
- struct hlink, 1, "hlink_list");
-
- hlink_list[from]->F_HLINDEX = to;
- hlink_list[from]->F_NEXT = head;
- hlink_list[from]->flags |= FLAG_HLINK_EOL;
- hlink_list[to++] = head;
- } else {
- pool_free(idev_pool, 0, head->link_u.idev);
- head->link_u.idev = NULL;
+ 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 (!to) {
- free(hlink_list);
- hlink_list = NULL;
- pool_destroy(hlink_pool);
- hlink_pool = NULL;
- } else {
- hlink_count = to;
- if (!(hlink_list = realloc_array(hlink_list,
- struct file_struct *, hlink_count)))
- out_of_memory("init_hard_links");
+ /* 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++;
}
- flist->hlink_pool = hlink_pool;
- pool_destroy(idev_pool);
+
+ /* Otherwise, take over this empty spot and then return it. */
+ tbl->buckets[bkt].key = key;
+ tbl->entries++;
+ return &tbl->buckets[bkt];
}
-#endif
-void init_hard_links(struct file_list *flist)
+struct idev_node *idev_node(int64 dev, int64 ino)
{
-#if SUPPORT_HARD_LINKS
- int i;
-
- if (flist->count < 2)
- return;
+ 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;
- if (hlink_list)
- free(hlink_list);
+ return ihash_node(tbl, ino);
+}
- if (!(hlink_list = new_array(struct file_struct *, flist->count)))
- out_of_memory("init_hard_links");
+void idev_destroy(void)
+{
+ int i;
- hlink_count = 0;
- for (i = 0; i < flist->count; i++) {
- if (flist->files[i]->link_u.idev)
- hlink_list[hlink_count++] = flist->files[i];
+ for (i = 0; i < dev_tbl->size; i++) {
+ if (dev_tbl->buckets[i].data)
+ ihash_destroy(dev_tbl->buckets[i].data);
}
- qsort(hlink_list, hlink_count,
- sizeof hlink_list[0], (int (*)()) hlink_compare);
+ ihash_destroy(dev_tbl);
+}
- if (!hlink_count) {
- free(hlink_list);
- hlink_list = NULL;
- } else
- link_idev_data(flist);
-#endif
+static int hlink_compare_gnum(int *int1, int *int2)
+{
+ struct file_struct *f1 = cur_flist->sorted[*int1];
+ struct file_struct *f2 = cur_flist->sorted[*int2];
+ int32 gnum1 = F_HL_GNUM(f1);
+ int32 gnum2 = F_HL_GNUM(f2);
+
+ if (gnum1 != gnum2)
+ return gnum1 > gnum2 ? 1 : -1;
+
+ return *int1 > *int2 ? 1 : -1;
}
-int hard_link_check(struct file_struct *file, int skip)
+static void match_gnums(int32 *ndx_list, int ndx_count)
{
- if (!hlink_list || !file->link_u.links)
- return 0;
- if (skip && !(file->flags & FLAG_HLINK_EOL))
- hlink_list[file->F_HLINDEX] = file->F_NEXT;
- if (hlink_list[file->F_HLINDEX] != file) {
- if (verbose > 1) {
- rprintf(FINFO, "\"%s\" is a hard link\n",
- f_name(file));
+ int32 from, prev;
+ struct file_struct *file, *file_next;
+ int32 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 = cur_flist->sorted[ndx_list[from]], gnum = F_HL_GNUM(file), prev = -1;
+ from < ndx_count-1;
+ file = file_next, gnum = gnum_next, from++)
+ {
+ file_next = cur_flist->sorted[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;
+ /* The linked list must use raw ndx values. */
+#ifdef ICONV_OPTION
+ if (ic_ndx)
+ prev = F_NDX(file);
+ else
+#endif
+ prev = ndx_list[from];
+ }
+ if (prev < 0)
+ file->flags &= ~FLAG_HLINKED;
+ else {
+ file->flags |= FLAG_HLINK_LAST;
+ F_HL_PREV(file) = prev;
}
- return 1;
}
- return 0;
}
-#if SUPPORT_HARD_LINKS
-static void hard_link_one(char *hlink1, char *hlink2)
+/* 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)
{
- if (do_link(hlink1, hlink2)) {
- if (verbose) {
- rsyserr(FINFO, errno, "link %s => %s failed",
- hlink2, hlink1);
- }
+ int i, ndx_count = 0;
+ int32 *ndx_list;
+
+ if (!(ndx_list = new_array(int32, cur_flist->count)))
+ out_of_memory("match_hard_links");
+
+ for (i = 0; i < cur_flist->count; i++) {
+ if (F_IS_HLINKED(cur_flist->sorted[i]))
+ ndx_list[ndx_count++] = i;
}
- else if (verbose)
- rprintf(FINFO, "%s => %s\n", hlink2, hlink1);
+
+ if (ndx_count)
+ match_gnums(ndx_list, ndx_count);
+
+ free(ndx_list);
+ if (protocol_version < 30)
+ idev_destroy();
}
-#endif
+static int maybe_hard_link(struct file_struct *file, int ndx,
+ const char *fname, int statret, statx *sxp,
+ const char *oldname, STRUCT_STAT *old_stp,
+ const char *realname, int itemizing, enum logcode code)
+{
+ if (statret == 0) {
+ if (sxp->st.st_dev == old_stp->st_dev
+ && sxp->st.st_ino == old_stp->st_ino) {
+ if (itemizing) {
+ itemize(fname, file, ndx, statret, sxp,
+ ITEM_LOCAL_CHANGE | ITEM_XNAME_FOLLOWS,
+ 0, "");
+ }
+ if (verbose > 1 && maybe_ATTRS_REPORT)
+ rprintf(FCLIENT, "%s is uptodate\n", fname);
+ file->flags |= FLAG_HLINK_DONE;
+ return 0;
+ }
+ if (make_backups > 0) {
+ if (!make_backup(fname))
+ return -1;
+ } else if (robust_unlink(fname)) {
+ rsyserr(FERROR, errno, "unlink %s failed",
+ full_fname(fname));
+ return -1;
+ }
+ }
+ if (hard_link_one(file, fname, oldname, 0)) {
+ if (itemizing) {
+ itemize(fname, file, ndx, statret, sxp,
+ ITEM_LOCAL_CHANGE | ITEM_XNAME_FOLLOWS, 0,
+ realname);
+ }
+ if (code != FNONE && verbose)
+ rprintf(code, "%s => %s\n", fname, realname);
+ return 0;
+ }
+ return -1;
+}
-/**
- * Create any hard links in the global hlink_list. They were put
- * there by running init_hard_links on the filelist.
- **/
-void do_hard_links(void)
+/* Only called if FLAG_HLINKED is set and FLAG_HLINK_FIRST is not. Returns:
+ * 0 = process the file, 1 = skip the file, -1 = error occurred. */
+int hard_link_check(struct file_struct *file, int ndx, const char *fname,
+ int statret, statx *sxp, int itemizing,
+ enum logcode code)
{
-#if SUPPORT_HARD_LINKS
- struct file_struct *file, *first;
- char hlink1[MAXPATHLEN];
- char *hlink2;
- STRUCT_STAT st1, st2;
- int i;
+ STRUCT_STAT prev_st;
+ char prev_name[MAXPATHLEN], altbuf[MAXPATHLEN], *realname;
+ int alt_dest, prev_ndx = F_HL_PREV(file);
+ struct file_struct *prev_file = cur_flist->files[prev_ndx];
+
+ /* Is the previous link is not complete yet? */
+ if (!(prev_file->flags & FLAG_HLINK_DONE)) {
+ /* Is the previous link being transferred? */
+ if (prev_file->flags & FLAG_FILE_SENT) {
+ /* Add ourselves to the list of files that will be
+ * updated when the transfer completes, and mark
+ * ourself as waiting for the transfer. */
+ F_HL_PREV(file) = F_HL_PREV(prev_file);
+ F_HL_PREV(prev_file) = ndx;
+ file->flags |= FLAG_FILE_SENT;
+ return 1;
+ }
+ return 0;
+ }
- if (!hlink_list)
- return;
+ /* There is a finished file to link with! */
+ if (!(prev_file->flags & FLAG_HLINK_FIRST)) {
+ /* The previous previous will be marked with FIRST. */
+ prev_ndx = F_HL_PREV(prev_file);
+ prev_file = cur_flist->files[prev_ndx];
+ /* Update our previous pointer to point to the first. */
+ F_HL_PREV(file) = prev_ndx;
+ }
+ alt_dest = F_HL_PREV(prev_file); /* alternate value when DONE && FIRST */
+ if (alt_dest >= 0 && dry_run) {
+ pathjoin(prev_name, MAXPATHLEN, basis_dir[alt_dest],
+ f_name(prev_file, NULL));
+ f_name(prev_file, altbuf);
+ realname = altbuf;
+ } else {
+ f_name(prev_file, prev_name);
+ realname = prev_name;
+ }
- for (i = 0; i < hlink_count; i++) {
- first = file = hlink_list[i];
- if (link_stat(f_name_to(first, hlink1), &st1) != 0)
- continue;
- while ((file = file->F_NEXT) != first) {
- hlink2 = f_name(file);
- if (link_stat(hlink2, &st2) == 0) {
- if (st2.st_dev == st1.st_dev
- && st2.st_ino == st1.st_ino)
- continue;
- if (make_backups) {
- if (!make_backup(hlink2))
- continue;
- } else if (robust_unlink(hlink2)) {
- if (verbose > 0) {
- rsyserr(FINFO, errno,
- "unlink %s failed",
- full_fname(hlink2));
- }
+ if (link_stat(prev_name, &prev_st, 0) < 0) {
+ rsyserr(FERROR, errno, "stat %s failed",
+ full_fname(prev_name));
+ return -1;
+ }
+
+ if (statret < 0 && basis_dir[0] != NULL) {
+ /* If we match an alt-dest item, we don't output this as a change. */
+ char cmpbuf[MAXPATHLEN];
+ statx alt_sx;
+ int j = 0;
+#ifdef SUPPORT_ACLS
+ alt_sx.acc_acl = alt_sx.def_acl = NULL;
+#endif
+ do {
+ pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
+ if (link_stat(cmpbuf, &alt_sx.st, 0) < 0)
+ continue;
+ if (link_dest) {
+ if (prev_st.st_dev != alt_sx.st.st_dev
+ || prev_st.st_ino != alt_sx.st.st_ino)
continue;
+ statret = 1;
+ if (verbose < 2 || !stdout_format_has_i) {
+ itemizing = 0;
+ code = FNONE;
+ if (verbose > 1 && maybe_ATTRS_REPORT)
+ rprintf(FCLIENT, "%s is uptodate\n", fname);
+ }
+ break;
+ }
+ if (!unchanged_file(cmpbuf, file, &alt_sx.st))
+ continue;
+ statret = 1;
+ if (unchanged_attrs(cmpbuf, file, &alt_sx))
+ break;
+ } while (basis_dir[++j] != NULL);
+ if (statret == 1) {
+ sxp->st = alt_sx.st;
+#ifdef SUPPORT_ACLS
+ if (preserve_acls && !S_ISLNK(file->mode)) {
+ if (!ACL_READY(*sxp))
+ get_acl(cmpbuf, sxp);
+ else {
+ sxp->acc_acl = alt_sx.acc_acl;
+ sxp->def_acl = alt_sx.def_acl;
}
}
- hard_link_one(hlink1, hlink2);
+#endif
}
+#ifdef SUPPORT_ACLS
+ else if (preserve_acls)
+ free_acl(&alt_sx);
+#endif
}
+
+ if (maybe_hard_link(file, ndx, fname, statret, sxp, prev_name, &prev_st,
+ realname, itemizing, code) < 0)
+ return -1;
+
+ if (remove_source_files == 1 && do_xfers)
+ send_msg_int(MSG_SUCCESS, ndx);
+
+ return 1;
+}
+
+int hard_link_one(struct file_struct *file, const char *fname,
+ const char *oldname, int terse)
+{
+ if (do_link(oldname, fname) < 0) {
+ enum logcode code;
+ if (terse) {
+ if (!verbose)
+ return -1;
+ code = FINFO;
+ } else
+ code = FERROR;
+ rsyserr(code, errno, "link %s => %s failed",
+ full_fname(fname), oldname);
+ return 0;
+ }
+
+ file->flags |= FLAG_HLINK_DONE;
+
+ return 1;
+}
+
+void finish_hard_link(struct file_struct *file, const char *fname,
+ STRUCT_STAT *stp, int itemizing, enum logcode code,
+ int alt_dest)
+{
+ statx prev_sx;
+ STRUCT_STAT st;
+ char alt_name[MAXPATHLEN], *prev_name;
+ const char *our_name;
+ int prev_statret, ndx, prev_ndx = F_HL_PREV(file);
+
+ if (stp == NULL && prev_ndx >= 0) {
+ if (link_stat(fname, &st, 0) < 0) {
+ rsyserr(FERROR, errno, "stat %s failed",
+ full_fname(fname));
+ return;
+ }
+ stp = &st;
+ }
+
+ /* FIRST combined with DONE means we were the first to get done. */
+ file->flags |= FLAG_HLINK_FIRST | FLAG_HLINK_DONE;
+ F_HL_PREV(file) = alt_dest;
+ if (alt_dest >= 0 && dry_run) {
+ pathjoin(alt_name, MAXPATHLEN, basis_dir[alt_dest],
+ f_name(file, NULL));
+ our_name = alt_name;
+ } else
+ our_name = fname;
+
+#ifdef SUPPORT_ACLS
+ prev_sx.acc_acl = prev_sx.def_acl = NULL;
+#endif
+
+ while ((ndx = prev_ndx) >= 0) {
+ int val;
+ file = cur_flist->files[ndx];
+ file->flags = (file->flags & ~FLAG_HLINK_FIRST) | FLAG_HLINK_DONE;
+ prev_ndx = F_HL_PREV(file);
+ prev_name = f_name(file, NULL);
+ prev_statret = link_stat(prev_name, &prev_sx.st, 0);
+ val = maybe_hard_link(file, ndx, prev_name, prev_statret, &prev_sx,
+ our_name, stp, fname, itemizing, code);
+#ifdef SUPPORT_ACLS
+ if (preserve_acls)
+ free_acl(&prev_sx);
#endif
+ if (val < 0)
+ continue;
+ if (remove_source_files == 1 && do_xfers)
+ send_msg_int(MSG_SUCCESS, ndx);
+ }
}
+#endif