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/*
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.
*/
#include "rsync.h"
extern int dry_run;
extern int verbose;
extern int make_backups;
#ifdef SUPPORT_HARD_LINKS
static int hlink_compare(struct file_struct **file1, struct file_struct **file2)
{
struct file_struct *f1 = *file1;
struct file_struct *f2 = *file2;
if (f1->F_DEV != f2->F_DEV)
return (int) (f1->F_DEV > f2->F_DEV ? 1 : -1);
if (f1->F_INODE != f2->F_INODE)
return (int) (f1->F_INODE > f2->F_INODE ? 1 : -1);
return f_name_cmp(f1, f2);
}
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 hlindex+next linked list. */
static void link_idev_data(struct file_list *flist)
{
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;
}
}
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");
}
flist->hlink_pool = hlink_pool;
pool_destroy(idev_pool);
}
#endif
void init_hard_links(struct file_list *flist)
{
#ifdef SUPPORT_HARD_LINKS
int i;
if (flist->count < 2)
return;
if (hlink_list)
free(hlink_list);
if (!(hlink_list = new_array(struct file_struct *, flist->count)))
out_of_memory("init_hard_links");
hlink_count = 0;
for (i = 0; i < flist->count; i++) {
if (flist->files[i]->link_u.idev)
hlink_list[hlink_count++] = flist->files[i];
}
qsort(hlink_list, hlink_count,
sizeof hlink_list[0], (int (*)()) hlink_compare);
if (!hlink_count) {
free(hlink_list);
hlink_list = NULL;
} else
link_idev_data(flist);
#endif
}
int hard_link_check(struct file_struct *file, int skip)
{
#ifdef SUPPORT_HARD_LINKS
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",
safe_fname(f_name(file)));
}
return 1;
}
#endif
return 0;
}
#ifdef SUPPORT_HARD_LINKS
static void hard_link_one(char *hlink1, char *hlink2)
{
if (do_link(hlink1, hlink2)) {
if (verbose) {
rsyserr(FINFO, errno, "link %s => %s failed",
full_fname(hlink2), safe_fname(hlink1));
}
}
else if (verbose)
rprintf(FINFO, "%s => %s\n", safe_fname(hlink2), safe_fname(hlink1));
}
#endif
/**
* 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)
{
#ifdef SUPPORT_HARD_LINKS
struct file_struct *file, *first;
char hlink1[MAXPATHLEN];
char *hlink2;
STRUCT_STAT st1, st2;
int i;
if (!hlink_list)
return;
for (i = 0; i < hlink_count; i++) {
first = file = hlink_list[i];
if (link_stat(f_name_to(first, hlink1), &st1, 0) < 0)
continue;
while ((file = file->F_NEXT) != first) {
hlink2 = f_name(file);
if (link_stat(hlink2, &st2, 0) == 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));
}
continue;
}
}
hard_link_one(hlink1, hlink2);
}
}
#endif
}
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