-/*
- 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.
-*/
+/*
+ * 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 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 am_server;
-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
+
+#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 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;
+
+ return tbl;
+}
-#if SUPPORT_HARD_LINKS
-static int hlink_compare(struct file_struct *f1,struct file_struct *f2)
+static void ihash_destroy(struct ihash_table *tbl)
{
- if (!S_ISREG(f1->mode) && !S_ISREG(f2->mode)) return 0;
- if (!S_ISREG(f1->mode)) return -1;
- if (!S_ISREG(f2->mode)) return 1;
+ free(tbl->buckets);
+ free(tbl);
+}
- if (f1->dev != f2->dev)
- return (f1->dev - f2->dev);
+void init_hard_links(void)
+{
+ dev_tbl = ihash_create(16);
+}
+
+static void expand_ihash(struct ihash_table *tbl)
+{
+ struct idev_node *old_buckets = tbl->buckets;
+ int size = tbl->size * 2;
+ int i;
- if (f1->inode != f2->inode)
- return (f1->inode - f2->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;
+
+ 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;
+ }
- return file_compare(f1,f2);
+ 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);
-static struct file_struct *hlink_list = NULL;
-static int hlink_count=0;
+ 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
-void init_hard_links(struct file_list *flist)
+ /* 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);
+}
+
+static int hlink_compare_gnum(int *int1, int *int2)
{
-#if SUPPORT_HARD_LINKS
- if (flist->count < 2) return;
+ 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 (hlink_list) free(hlink_list);
-
- if (!(hlink_list =
- (struct file_struct *)malloc(sizeof(hlink_list[0])*flist->count)))
- out_of_memory("init_hard_links");
+ if (gnum1 != gnum2)
+ return gnum1 > gnum2 ? 1 : -1;
- bcopy((char *)flist->files,
- (char *)hlink_list,
- sizeof(hlink_list[0])*flist->count);
+ return *int1 > *int2 ? 1 : -1;
+}
+
+static void match_gnums(int32 *ndx_list, int ndx_count)
+{
+ int32 from, prev;
+ struct file_struct *file, *file_next;
+ int32 gnum, gnum_next;
- qsort(hlink_list,flist->count,
- sizeof(hlink_list[0]),
- (int (*)())hlink_compare);
+ qsort(ndx_list, ndx_count, sizeof ndx_list[0],
+ (int (*)()) hlink_compare_gnum);
- hlink_count=flist->count;
+ 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++) /*SHARED ITERATOR*/
+ {
+ 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;
+ }
+ }
+}
+
+/* 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, cur_flist->used)))
+ out_of_memory("match_hard_links");
+
+ for (i = 0; i < cur_flist->used; i++) {
+ if (F_IS_HLINKED(cur_flist->sorted[i]))
+ ndx_list[ndx_count++] = i;
+ }
+
+ if (ndx_count)
+ match_gnums(ndx_list, ndx_count);
+
+ free(ndx_list);
+ if (protocol_version < 30)
+ idev_destroy();
}
-/* check if a file should be skipped because it is the same as an
- earlier hard link */
-int check_hard_link(struct file_struct *file)
+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 SUPPORT_HARD_LINKS
- int low=0,high=hlink_count-1;
- int mid=0,ret=0;
-
- if (!hlink_list || !S_ISREG(file->mode)) return 0;
-
- while (low != high) {
- mid = (low+high)/2;
- ret = hlink_compare(&hlink_list[mid],file);
- if (ret == 0) break;
- if (ret > 0)
- high=mid;
- else
- low=mid+1;
- }
-
- if (hlink_compare(&hlink_list[mid],file) != 0) return 0;
-
- if (mid > 0 &&
- S_ISREG(hlink_list[mid-1].mode) &&
- file->dev == hlink_list[mid-1].dev &&
- file->inode == hlink_list[mid-1].inode)
- return 1;
+ 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;
+}
+
+/* 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)
+{
+ 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;
+ }
+
+ /* 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;
+ }
+
+ 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;
+ }
+ }
+#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 0;
+ 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;
+}
-/* create any hard links in the flist */
-void do_hard_links(struct file_list *flist)
+void finish_hard_link(struct file_struct *file, const char *fname,
+ STRUCT_STAT *stp, int itemizing, enum logcode code,
+ int alt_dest)
{
-#if SUPPORT_HARD_LINKS
- int i;
-
- if (!hlink_list) return;
-
- for (i=1;i<hlink_count;i++) {
- if (S_ISREG(hlink_list[i].mode) &&
- S_ISREG(hlink_list[i-1].mode) &&
- hlink_list[i].name && hlink_list[i-1].name &&
- hlink_list[i].dev == hlink_list[i-1].dev &&
- hlink_list[i].inode == hlink_list[i-1].inode) {
- struct stat st1,st2;
-
- if (link_stat(hlink_list[i-1].name,&st1) != 0) continue;
- if (link_stat(hlink_list[i].name,&st2) != 0) {
- if (!dry_run && link(hlink_list[i-1].name,hlink_list[i].name) != 0) {
- if (verbose > 0)
- fprintf(FINFO,"link %s => %s : %s\n",
- hlink_list[i].name,
- hlink_list[i-1].name,strerror(errno));
- continue;
- }
- } else {
- if (st2.st_dev == st1.st_dev && st2.st_ino == st1.st_ino) continue;
-
- if (!dry_run && (unlink(hlink_list[i].name) != 0 ||
- link(hlink_list[i-1].name,hlink_list[i].name) != 0)) {
- if (verbose > 0)
- fprintf(FINFO,"link %s => %s : %s\n",
- hlink_list[i].name,
- hlink_list[i-1].name,strerror(errno));
- continue;
- }
- }
- if (verbose > 0)
- fprintf(FINFO,"%s => %s\n",
- hlink_list[i].name,hlink_list[i-1].name);
- }
- }
+ 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
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