X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/bcacc18bdf1bdac625ef1f178e8e32892544cc30..6dff599288f7781d7b3a2ec8df758341690c4197:/hlink.c

diff --git a/hlink.c b/hlink.c
index 6b2c0605..d5600d30 100644
--- a/hlink.c
+++ b/hlink.c
@@ -1,17 +1,18 @@
-/* 
+/*
    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.
@@ -19,139 +20,153 @@
 
 #include "rsync.h"
 
-extern int am_server;
 extern int dry_run;
 extern int verbose;
 
 #if SUPPORT_HARD_LINKS
-static int hlink_compare(struct file_struct *f1,struct file_struct *f2)
+static int hlink_compare(struct file_struct **file1, struct file_struct **file2)
 {
-  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;
+	struct file_struct *f1 = *file1;
+	struct file_struct *f2 = *file2;
 
-  if (f1->dev != f2->dev) 
-    return (int)(f1->dev>f2->dev?1:-1);
+	if (f1->F_DEV != f2->F_DEV)
+		return (int) (f1->F_DEV > f2->F_DEV ? 1 : -1);
 
-  if (f1->inode != f2->inode) 
-    return (int)(f1->inode>f2->inode?1:-1);
+	if (f1->F_INODE != f2->F_INODE)
+		return (int) (f1->F_INODE > f2->F_INODE ? 1 : -1);
 
-  return file_compare(&f1,&f2);
+	return file_compare(file1, file2);
 }
 
-
-static struct file_struct *hlink_list;
+static struct file_struct **hlink_list;
 static int hlink_count;
+
+#define LINKED(p1,p2) ((p1)->F_DEV == (p2)->F_DEV \
+		    && (p1)->F_INODE == (p2)->F_INODE)
+
+/* Analyze the data in the hlink_list[], remove items that aren't multiply
+ * linked, and replace the dev+inode data with the head+next linked list. */
+static void link_idev_data(void)
+{
+	struct file_struct *head;
+	int from, to, start;
+
+	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])) {
+			hlink_list[from]->F_HEAD = head;
+			hlink_list[from]->F_NEXT = hlink_list[from+1];
+			from++;
+		}
+		if (from > start) {
+			hlink_list[from]->F_HEAD = head;
+			hlink_list[from]->F_NEXT = NULL;
+			hlink_list[to++] = head;
+		} else {
+			free((char*)head->link_u.idev);
+			head->link_u.idev = NULL;
+		}
+	}
+
+	if (!to) {
+		free(hlink_list);
+		hlink_list = NULL;
+	} else {
+		hlink_count = to;
+		if (!(hlink_list = realloc_array(hlink_list,
+					struct file_struct *, hlink_count)))
+			out_of_memory("init_hard_links");
+	}
+}
 #endif
 
 void init_hard_links(struct file_list *flist)
 {
 #if SUPPORT_HARD_LINKS
 	int i;
-	if (flist->count < 2) return;
 
-	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 (flist->count < 2)
+		return;
+
+	if (hlink_list)
+		free(hlink_list);
 
-	for (i = 0; i < flist->count; i++)
-		bcopy(flist->files[i], &hlink_list[i], sizeof(hlink_list[0]));
+	if (!(hlink_list = new_array(struct file_struct *, flist->count)))
+		out_of_memory("init_hard_links");
 
-	qsort(hlink_list,flist->count,
-	      sizeof(hlink_list[0]),
-	      (int (*)())hlink_compare);
+	hlink_count = 0;
+	for (i = 0; i < flist->count; i++) {
+		if (flist->files[i]->link_u.idev)
+			hlink_list[hlink_count++] = flist->files[i];
+	}
 
-	hlink_count=flist->count;
-#endif
-}
+	qsort(hlink_list, hlink_count,
+	      sizeof(hlink_list[0]), (int (*)()) hlink_compare);
 
-/* 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)
-{
-#if SUPPORT_HARD_LINKS
-  int low=0,high=hlink_count-1;
-  int ret=0;
-
-  if (!hlink_list || !S_ISREG(file->mode)) return 0;
-
-  while (low != high) {
-    int mid = (low+high)/2;
-    ret = hlink_compare(&hlink_list[mid],file);
-    if (ret == 0) {
-	    low = mid;
-	    break;
-    }
-    if (ret > 0) 
-      high=mid;
-    else
-      low=mid+1;
-  }
-
-  if (hlink_compare(&hlink_list[low],file) != 0) return 0;
-
-  if (low > 0 &&
-      S_ISREG(hlink_list[low-1].mode) &&
-      file->dev == hlink_list[low-1].dev &&
-      file->inode == hlink_list[low-1].inode)
-    return 1;
+	if (!hlink_count) {
+		free(hlink_list);
+		hlink_list = NULL;
+	} else
+		link_idev_data();
 #endif
-
-  return 0;
 }
 
-
 #if SUPPORT_HARD_LINKS
-static void hard_link_one(int i)
+static void hard_link_one(char *hlink1, char *hlink2)
 {
-	STRUCT_STAT st1,st2;
-
-	if (link_stat(f_name(&hlink_list[i-1]),&st1) != 0) return;
-
-	if (link_stat(f_name(&hlink_list[i]),&st2) != 0) {
-		if (do_link(f_name(&hlink_list[i-1]),f_name(&hlink_list[i])) != 0) {
-			if (verbose > 0)
-				fprintf(FINFO,"link %s => %s : %s\n",
-					f_name(&hlink_list[i]),
-					f_name(&hlink_list[i-1]),strerror(errno));
-			return;
-		}
-	} else {
-		if (st2.st_dev == st1.st_dev && st2.st_ino == st1.st_ino) return;
-		
-		if (do_unlink(f_name(&hlink_list[i])) != 0 ||
-		    do_link(f_name(&hlink_list[i-1]),f_name(&hlink_list[i])) != 0) {
-			if (verbose > 0)
-				fprintf(FINFO,"link %s => %s : %s\n",
-					f_name(&hlink_list[i]),
-					f_name(&hlink_list[i-1]),strerror(errno));
-			return;
+	if (do_link(hlink1, hlink2)) {
+		if (verbose > 0) {
+			rprintf(FINFO, "link %s => %s failed: %s\n",
+				hlink2, hlink1, strerror(errno));
 		}
 	}
-	if (verbose > 0)
-		fprintf(FINFO,"%s => %s\n",
-			f_name(&hlink_list[i]),f_name(&hlink_list[i-1]));
+	else if (verbose > 0)
+		rprintf(FINFO, "%s => %s\n", hlink2, hlink1);
 }
 #endif
 
-/* create any hard links in the flist */
-void do_hard_links(struct file_list *flist)
+
+
+/**
+ * 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)
 {
 #if SUPPORT_HARD_LINKS
+	struct file_struct *file;
+	char hlink1[MAXPATHLEN];
+	char *hlink2;
+	STRUCT_STAT st1, st2;
 	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].basename && hlink_list[i-1].basename &&
-		    hlink_list[i].dev == hlink_list[i-1].dev &&
-		    hlink_list[i].inode == hlink_list[i-1].inode) {
-			hard_link_one(i);
-		}	
+
+	if (!hlink_list)
+		return;
+
+	for (i = 0; i < hlink_count; i++) {
+		file = hlink_list[i];
+		if (link_stat(f_name_to(file, hlink1), &st1) != 0)
+			continue;
+		while ((file = file->F_NEXT) != NULL) {
+			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 (robust_unlink(hlink2)) {
+					if (verbose > 0) {
+						rprintf(FINFO,
+							"unlink %s failed: %s\n",
+							full_fname(hlink2), 
+							strerror(errno));
+					}
+					continue;
+				}
+			}
+			hard_link_one(hlink1, hlink2);
+		}
 	}
 #endif
 }